zig c++ hanging when invoked in parallel

[motiejus]

I am using a combination of zig c++, golang and bazel to cross-compile a cgo program to Darwin. It compiles go stdlib in parallel and sometimes hangs. A container with a hung ps auxf looks as follows:

root@4ba08cf5c898:/x# ps auxf | cat
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 5093 0.4 0.0 3968 3472 pts/1 Ss 04:03 0:00 bash
root 5190 0.0 0.0 6700 2952 pts/1 R+ 04:03 0:00 \_ ps auxf
root 5191 0.0 0.0 2468 516 pts/1 S+ 04:03 0:00 \_ cat
root 1 0.0 0.0 709728 17392 pts/0 Ssl+ Jun16 0:01 ./bazel build -s --platforms @zig_sdk//:aarch64-macos-gnu //test:gognu
root 2423 0.0 0.0 343176 22712 pts/0 Sl+ Jun16 0:12 /root/.cache/bazelisk/downloads/bazelbuild/bazel-4.1.0-linux-x86_64/bin/bazel build -s --platforms @zig_sdk//:aarch64-macos-gnu //test:gognu
root 2428 0.5 3.1 14181376 1017740 ? Ssl Jun16 2:11 bazel(x) -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/root/.cache/bazel/_bazel_root/cc8755609ad61864910f145119713de9 --add-opens=java.base/java.nio=ALL-UNNAMED --add-opens=java.base/java.lang=ALL-UNNAMED -Xverify:none -Djava.util.logging.config.file=/root/.cache/bazel/_bazel_root/cc8755609ad61864910f145119713de9/javalog.properties -Dcom.google.devtools.build.lib.util.LogHandlerQuerier.class=com.google.devtools.build.lib.util.SimpleLogHandler$HandlerQuerier -XX:-MaxFDLimit -Djava.library.path=/root/.cache/bazel/_bazel_root/install/f95ca91ebc34d56aa0f8ad499de91220/embedded_tools/jdk/lib/jli:/root/.cache/bazel/_bazel_root/install/f95ca91ebc34d56aa0f8ad499de91220/embedded_tools/jdk/lib:/root/.cache/bazel/_bazel_root/install/f95ca91ebc34d56aa0f8ad499de91220/embedded_tools/jdk/lib/server:/root/.cache/bazel/_bazel_root/install/f95ca91ebc34d56aa0f8ad499de91220/ -Dfile.encoding=ISO-8859-1 -jar /root/.cache/bazel/_bazel_root/install/f95ca91ebc34d56aa0f8ad499de91220/A-server.jar --max_idle_secs=10800 --noshutdown_on_low_sys_mem --connect_timeout_secs=30 --output_user_root=/root/.cache/bazel/_bazel_root --install_base=/root/.cache/bazel/_bazel_root/install/f95ca91ebc34d56aa0f8ad499de91220 --install_md5=f95ca91ebc34d56aa0f8ad499de91220 --output_base=/root/.cache/bazel/_bazel_root/cc8755609ad61864910f145119713de9 --workspace_directory=/x --default_system_javabase= --failure_detail_out=/root/.cache/bazel/_bazel_root/cc8755609ad61864910f145119713de9/failure_detail.rawproto --expand_configs_in_place --idle_server_tasks --write_command_log --nowatchfs --nofatal_event_bus_exceptions --nowindows_enable_symlinks --client_debug=false --product_name=Bazel --noincompatible_enable_execution_transition --option_sources=
root 2709 0.0 0.0 5796 1632 ? S Jun16 0:00 \_ /root/.cache/bazel/_bazel_root/install/f95ca91ebc34d56aa0f8ad499de91220/process-wrapper --timeout=0 --kill_delay=15 bazel-out/host/bin/external/go_sdk/builder stdlib -sdk external/go_sdk -installsuffix darwin_arm64 -out bazel-out/k8-fastbuild/bin/external/io_bazel_rules_go/stdlib_
root 2710 0.0 0.0 707676 13572 ? Ssl Jun16 0:01 \_ bazel-out/host/bin/external/go_sdk/builder stdlib -sdk external/go_sdk -installsuffix darwin_arm64 -out bazel-out/k8-fastbuild/bin/external/io_bazel_rules_go/stdlib_
root 2715 0.0 0.0 1159684 31992 ? Sl Jun16 0:03 \_ external/go_sdk/bin/go install -toolexec /root/.cache/bazel/_bazel_root/cc8755609ad61864910f145119713de9/sandbox/processwrapper-sandbox/3/execroot/bazel-zig-cc/bazel-out/host/bin/external/go_sdk/builder filterbuildid -gcflags=all= -ldflags=all=-trimpath /root/.cache/bazel/_bazel_root/cc8755609ad61864910f145119713de9/sandbox/processwrapper-sandbox/3/execroot/bazel-zig-cc -asmflags=all=-trimpath /root/.cache/bazel/_bazel_root/cc8755609ad61864910f145119713de9/sandbox/processwrapper-sandbox/3/execroot/bazel-zig-cc/bazel-out/k8-fastbuild/bin/external/io_bazel_rules_go/stdlib_ std runtime/cgo
root 5087 0.0 0.0 152932 30948 ? Sl Jun16 0:00 \_ /root/.cache/bazel/_bazel_root/cc8755609ad61864910f145119713de9/external/zig_sdk/zig c++ -I /root/.cache/bazel/_bazel_root/cc8755609ad61864910f145119713de9/sandbox/processwrapper-sandbox/3/execroot/bazel-zig-cc/bazel-out/k8-fastbuild/bin/external/io_bazel_rules_go/stdlib_/src/net -fPIC -arch arm64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build2201875783/b087=/tmp/go-build -gno-record-gcc-switches -fno-common -o /tmp/go-build2201875783/b087/_cgo_.o /tmp/go-build2201875783/b087/_cgo_main.o /tmp/go-build2201875783/b087/_x001.o /tmp/go-build2201875783/b087/_x002.o /tmp/go-build2201875783/b087/_x003.o /tmp/go-build2201875783/b087/_x004.o /tmp/go-build2201875783/b087/_x005.o -target aarch64-macos-gnu
root 5088 0.0 0.0 152932 31092 ? Sl Jun16 0:00 \_ /root/.cache/bazel/_bazel_root/cc8755609ad61864910f145119713de9/external/zig_sdk/zig c++ -I /root/.cache/bazel/_bazel_root/cc8755609ad61864910f145119713de9/sandbox/processwrapper-sandbox/3/execroot/bazel-zig-cc/bazel-out/k8-fastbuild/bin/external/io_bazel_rules_go/stdlib_/src/os/user -fPIC -arch arm64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build2201875783/b036=/tmp/go-build -gno-record-gcc-switches -fno-common -o /tmp/go-build2201875783/b036/_cgo_.o /tmp/go-build2201875783/b036/_cgo_main.o /tmp/go-build2201875783/b036/_x001.o /tmp/go-build2201875783/b036/_x002.o /tmp/go-build2201875783/b036/_x003.o /tmp/go-build2201875783/b036/_x004.o -target aarch64-macos-gnu

Both are waiting on some lock (pids are different, since I am stracing outside the container):

motiejus ~/code/bazel-zig-cc $ sudo strace -p 812414
strace: Process 812414 attached
futex(0x7f3743028b70, FUTEX_WAIT_PRIVATE, 4294967295, NULL^Cstrace: Process 812414 detached
 <detached ...>

motiejus ~/code/bazel-zig-cc $ sudo strace -p 812415
strace: Process 812415 attached
futex(0x7f12064f8b70, FUTEX_WAIT_PRIVATE, 4294967295, NULL^Cstrace: Process 812415 detached
 <detached ...>

kill -USR1 did not produce a stack trace. Is there any more information I can provide? Steps to reproduce on a x86_64-linux machine with a working docker installation:

$ git clone https://git.sr.ht/~motiejus/bazel-zig-cc -b hangzig
$ cd bazel-zig-cc
$ for i in $(seq 1000); do date; echo $i; time ./hangzig; done

It fails more often in builds.sr.ht (therefore the test script has --cpuset-cpus=0-1, because builds.sr.ht allocates 2 CPUs), e.g. https://builds.sr.ht/~motiejus/job/526372. On my laptop it failed on the 15'th iteration, an iteration is ~90 seconds.

zig version: 0.9.0-dev.137+86ebd4b97. I know bazel in the loop is cumbersome, but I wasn't able to find an easy way to reproduce it without it.

[motiejus]

Like discussed on IRC, I ran this overnight with a debug build of zig; it keeps running successfully, 266 iterations, and counting.

[motiejus]

Apparently it needs a x86_64-linux-musl build of zig to manifest. Bingo!

Process 1

warning: Target and debugger are in different PID namespaces; thread lists and other data are likely unreliable. Connect to gdbserver inside the container.
0x000000000781bbae in sccp ()
(gdb) thread apply all bt

Thread 3 (LWP 2874014 "zig"):
#0 0x00000000078093b3 in flock ()
#1 0x0000000002da4d4f in std.os.flock (fd=10, operation=2) at /home/motiejus/code/zig-bootstrap/zig/lib/std/os.zig:4373
#2 0x0000000002b503f5 in std.fs.Dir.createFileZ (self=..., sub_path_c=0x7ff8d0d6f7b0 "18c5d15d382debc4dd4079a12f75e0a1.txt", flags=...) at /home/motiejus/code/zig-bootstrap/zig/lib/std/fs.zig:983
#3 0x0000000002b4bbcb in std.fs.Dir.createFile (self=..., sub_path=..., flags=...) at /home/motiejus/code/zig-bootstrap/zig/lib/std/fs.zig:914
#4 0x0000000002b4715d in Cache.Manifest.hit (self=0x7ff8d0d727c0) at /home/motiejus/code/zig-bootstrap/zig/src/Cache.zig:289
#5 0x0000000002df68ab in Compilation.updateCObject (comp=0x7ff8d1d876b8, c_object=0x7ff8d1d77490, c_obj_prog_node=0x7ffc29381080) at /home/motiejus/code/zig-bootstrap/zig/src/Compilation.zig:2622
#6 0x0000000002df6189 in Compilation.workerUpdateCObject (comp=0x7ff8d1d876b8, c_object=0x7ff8d1d77490, progress_node=0x7ffc29381080, wg=0x7ff8d1d87b40) at /home/motiejus/code/zig-bootstrap/zig/src/Compilation.zig:2494
#7 0x0000000002df8aa9 in ThreadPool.Closure.runFn (runnable=0x7ff8d1d77d40) at /home/motiejus/code/zig-bootstrap/zig/src/ThreadPool.zig:117
#8 0x0000000002be3338 in ThreadPool.Worker.run (worker=0x7ff8d1d83408) at /home/motiejus/code/zig-bootstrap/zig/src/ThreadPool.zig:35
#9 0x0000000002be36e8 in std.Thread.MainFuncs.posixThreadMain (ctx=0x7ff8d1dd9d60) at /home/motiejus/code/zig-bootstrap/zig/lib/std/Thread.zig:299
#10 0x000000000781d09c in start ()
#11 0x0000000000000000 in ?? ()

Thread 2 (LWP 2874013 "zig"):
#0 0x00000000078093b3 in flock ()
#1 0x0000000002da4d4f in std.os.flock (fd=12, operation=2) at /home/motiejus/code/zig-bootstrap/zig/lib/std/os.zig:4373
#2 0x0000000002b503f5 in std.fs.Dir.createFileZ (self=..., sub_path_c=0x7ff8d1d717b0 "67d6c9ffb54c8f0dcc6e5c5e272f66c2.txt", flags=...) at /home/motiejus/code/zig-bootstrap/zig/lib/std/fs.zig:983
#3 0x0000000002b4bbcb in std.fs.Dir.createFile (self=..., sub_path=..., flags=...) at /home/motiejus/code/zig-bootstrap/zig/lib/std/fs.zig:914
#4 0x0000000002b4715d in Cache.Manifest.hit (self=0x7ff8d1d747c0) at /home/motiejus/code/zig-bootstrap/zig/src/Cache.zig:289
#5 0x0000000002df68ab in Compilation.updateCObject (comp=0x7ff8d1d876b8, c_object=0x7ff8d1d773f0, c_obj_prog_node=0x7ffc29381080) at /home/motiejus/code/zig-bootstrap/zig/src/Compilation.zig:2622
#6 0x0000000002df6189 in Compilation.workerUpdateCObject (comp=0x7ff8d1d876b8, c_object=0x7ff8d1d773f0, progress_node=0x7ffc29381080, wg=0x7ff8d1d87b40) at /home/motiejus/code/zig-bootstrap/zig/src/Compilation.zig:2494
#7 0x0000000002df8aa9 in ThreadPool.Closure.runFn (runnable=0x7ff8d1d77cc0) at /home/motiejus/code/zig-bootstrap/zig/src/ThreadPool.zig:117
#8 0x0000000002be3338 in ThreadPool.Worker.run (worker=0x7ff8d1d833d0) at /home/motiejus/code/zig-bootstrap/zig/src/ThreadPool.zig:35
#9 0x0000000002be36e8 in std.Thread.MainFuncs.posixThreadMain (ctx=0x7ff8d1dd9d50) at /home/motiejus/code/zig-bootstrap/zig/lib/std/Thread.zig:299
#10 0x000000000781d09c in start ()
#11 0x0000000000000000 in ?? ()

Thread 1 (LWP 2874009 "zig"):
#0 0x000000000781bbae in sccp ()
#1 0x000000000781c65d in __timedwait_cp ()
#2 0x0000000000000038 in ?? ()
#3 0x0000000000000000 in ?? ()
(gdb) 

Process 2

warning: Target and debugger are in different PID namespaces; thread lists and other data are likely unreliable. Connect to gdbserver inside the container.
0x000000000781bbae in sccp ()
(gdb) thread apply all bt

Thread 3 (LWP 2874012 "zig"):
#0 0x00000000078093b3 in flock ()
#1 0x0000000002da4d4f in std.os.flock (fd=11, operation=2) at /home/motiejus/code/zig-bootstrap/zig/lib/std/os.zig:4373
#2 0x0000000002b503f5 in std.fs.Dir.createFileZ (self=..., sub_path_c=0x7f7cece577b0 "aeee3b9656aecd6cbe1df612eb49381b.txt", flags=...) at /home/motiejus/code/zig-bootstrap/zig/lib/std/fs.zig:983
#3 0x0000000002b4bbcb in std.fs.Dir.createFile (self=..., sub_path=..., flags=...) at /home/motiejus/code/zig-bootstrap/zig/lib/std/fs.zig:914
#4 0x0000000002b4715d in Cache.Manifest.hit (self=0x7f7cece5a7c0) at /home/motiejus/code/zig-bootstrap/zig/src/Cache.zig:289
#5 0x0000000002df68ab in Compilation.updateCObject (comp=0x7f7cede6f6b8, c_object=0x7f7cede5f440, c_obj_prog_node=0x7ffcd64a1380) at /home/motiejus/code/zig-bootstrap/zig/src/Compilation.zig:2622
#6 0x0000000002df6189 in Compilation.workerUpdateCObject (comp=0x7f7cede6f6b8, c_object=0x7f7cede5f440, progress_node=0x7ffcd64a1380, wg=0x7f7cede6fb40) at /home/motiejus/code/zig-bootstrap/zig/src/Compilation.zig:2494
#7 0x0000000002df8aa9 in ThreadPool.Closure.runFn (runnable=0x7f7cede5fd00) at /home/motiejus/code/zig-bootstrap/zig/src/ThreadPool.zig:117
#8 0x0000000002be3338 in ThreadPool.Worker.run (worker=0x7f7cede6b408) at /home/motiejus/code/zig-bootstrap/zig/src/ThreadPool.zig:35
#9 0x0000000002be36e8 in std.Thread.MainFuncs.posixThreadMain (ctx=0x7f7cedec1d60) at /home/motiejus/code/zig-bootstrap/zig/lib/std/Thread.zig:299
#10 0x000000000781d09c in start ()
#11 0x0000000000000000 in ?? ()

Thread 2 (LWP 2874011 "zig"):
#0 0x000000000781bbae in sccp ()
#1 0x000000000781c65d in __timedwait_cp ()
#2 0x0000000000000000 in ?? ()

Thread 1 (LWP 2874010 "zig"):
#0 0x000000000781bbae in sccp ()
#1 0x000000000781c65d in __timedwait_cp ()
#2 0x0000000000000038 in ?? ()
#3 0x0000000000000000 in ?? ()
(gdb) 

Not sure how significant the warning is: I cannot run strace in the container, because it doesn't have ptrace permissions (I forgot to add --privileged).

Zig version

0.8.0-194-gb9e78593b, compiled from https://github.com/ziglang/zig-bootstrap with these changes:

• manually updated zig source tree (rm -fr zig; cp -r ../zig .)
• patched build, so it emits a Debug build instead of Release build.
• Build command: ./build -j6 x86_64-linux-musl native

[LemonBoy]

Interesting, are you able to get the output of lslocks inside the container?
It's possible that Cache.hit hits some error and never closes the locked file self.manifest_file, I'm not that familiar with the cache code to tell if that could be a problem.

[motiejus]

Interesting, are you able to get the output of lslocks inside the container?

I have stopped the original and am trying to capture it again with --privileged (so I can ptrace inside the container). If/when that happens again, I will re-report the backtraces and output of lslocks.

[mikdusan]

perhaps the conditional is our happy little bug?

zig/src/main.zig

Line 2378 in 1f29b75

defer if (enable_cache) man.deinit();

[motiejus]

A new set of borked processes, with ptrace privileges:

ps auxf

root@6cf98e48ebb0:/x# ps auxf | cat
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 5608 0.0 0.0 4088 3300 pts/1 Ss 15:15 0:00 bash
root 6167 0.0 0.0 6696 2972 pts/1 R+ 15:15 0:00 \_ ps auxf
root 6168 0.0 0.0 2464 516 pts/1 S+ 15:15 0:00 \_ cat
root 1 0.0 0.0 709980 9060 pts/0 Ssl+ 12:26 0:00 ./bazel build -s --platforms @zig_sdk//:aarch64-macos-gnu //test:gognu
root 2421 0.0 0.0 343876 4896 pts/0 Sl+ 12:26 0:03 /root/.cache/bazelisk/downloads/bazelbuild/bazel-4.1.0-linux-x86_64/bin/bazel build -s --platforms @zig_sdk//:aarch64-macos-gnu //test:gognu
root 2426 0.7 0.1 17997740 471468 ? Ssl 12:26 1:17 bazel(x) -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/root/.cache/bazel/_bazel_root/cc8755609ad61864910f145119713de9 --add-opens=java.base/java.nio=ALL-UNNAMED --add-opens=java.base/java.lang=ALL-UNNAMED -Xverify:none -Djava.util.logging.config.file=/root/.cache/bazel/_bazel_root/cc8755609ad61864910f145119713de9/javalog.properties -Dcom.google.devtools.build.lib.util.LogHandlerQuerier.class=com.google.devtools.build.lib.util.SimpleLogHandler$HandlerQuerier -XX:-MaxFDLimit -Djava.library.path=/root/.cache/bazel/_bazel_root/install/f95ca91ebc34d56aa0f8ad499de91220/embedded_tools/jdk/lib/jli:/root/.cache/bazel/_bazel_root/install/f95ca91ebc34d56aa0f8ad499de91220/embedded_tools/jdk/lib:/root/.cache/bazel/_bazel_root/install/f95ca91ebc34d56aa0f8ad499de91220/embedded_tools/jdk/lib/server:/root/.cache/bazel/_bazel_root/install/f95ca91ebc34d56aa0f8ad499de91220/ -Dfile.encoding=ISO-8859-1 -jar /root/.cache/bazel/_bazel_root/install/f95ca91ebc34d56aa0f8ad499de91220/A-server.jar --max_idle_secs=10800 --noshutdown_on_low_sys_mem --connect_timeout_secs=30 --output_user_root=/root/.cache/bazel/_bazel_root --install_base=/root/.cache/bazel/_bazel_root/install/f95ca91ebc34d56aa0f8ad499de91220 --install_md5=f95ca91ebc34d56aa0f8ad499de91220 --output_base=/root/.cache/bazel/_bazel_root/cc8755609ad61864910f145119713de9 --workspace_directory=/x --default_system_javabase= --failure_detail_out=/root/.cache/bazel/_bazel_root/cc8755609ad61864910f145119713de9/failure_detail.rawproto --expand_configs_in_place --idle_server_tasks --write_command_log --nowatchfs --nofatal_event_bus_exceptions --nowindows_enable_symlinks --client_debug=false --product_name=Bazel --noincompatible_enable_execution_transition --option_sources=
root 3006 0.0 0.0 5808 3280 ? S 12:27 0:00 \_ /root/.cache/bazel/_bazel_root/install/f95ca91ebc34d56aa0f8ad499de91220/linux-sandbox -t 15 -w /root/.cache/bazel/_bazel_root/cc8755609ad61864910f145119713de9/sandbox/linux-sandbox/3/execroot/bazel-zig-cc -w /tmp -w /dev/shm -- bazel-out/host/bin/external/go_sdk/builder stdlib -sdk external/go_sdk -installsuffix darwin_arm64 -out bazel-out/k8-fastbuild/bin/external/io_bazel_rules_go/stdlib_
root 3007 0.0 0.0 6836 1244 ? S 12:27 0:00 \_ /root/.cache/bazel/_bazel_root/install/f95ca91ebc34d56aa0f8ad499de91220/linux-sandbox -t 15 -w /root/.cache/bazel/_bazel_root/cc8755609ad61864910f145119713de9/sandbox/linux-sandbox/3/execroot/bazel-zig-cc -w /tmp -w /dev/shm -- bazel-out/host/bin/external/go_sdk/builder stdlib -sdk external/go_sdk -installsuffix darwin_arm64 -out bazel-out/k8-fastbuild/bin/external/io_bazel_rules_go/stdlib_
root 3008 0.0 0.0 707672 3408 ? Sl 12:27 0:01 \_ bazel-out/host/bin/external/go_sdk/builder stdlib -sdk external/go_sdk -installsuffix darwin_arm64 -out bazel-out/k8-fastbuild/bin/external/io_bazel_rules_go/stdlib_
root 3013 0.0 0.0 1159680 14200 ? Sl 12:27 0:02 \_ external/go_sdk/bin/go install -toolexec /root/.cache/bazel/_bazel_root/cc8755609ad61864910f145119713de9/sandbox/linux-sandbox/3/execroot/bazel-zig-cc/bazel-out/host/bin/external/go_sdk/builder filterbuildid -gcflags=all= -ldflags=all=-trimpath /root/.cache/bazel/_bazel_root/cc8755609ad61864910f145119713de9/sandbox/linux-sandbox/3/execroot/bazel-zig-cc -asmflags=all=-trimpath /root/.cache/bazel/_bazel_root/cc8755609ad61864910f145119713de9/sandbox/linux-sandbox/3/execroot/bazel-zig-cc/bazel-out/k8-fastbuild/bin/external/io_bazel_rules_go/stdlib_ std runtime/cgo
root 5598 0.0 0.0 162336 26764 ? Sl 12:28 0:00 \_ /root/.cache/bazel/_bazel_root/cc8755609ad61864910f145119713de9/external/zig_sdk/zig c++ -I /root/.cache/bazel/_bazel_root/cc8755609ad61864910f145119713de9/sandbox/linux-sandbox/3/execroot/bazel-zig-cc/bazel-out/k8-fastbuild/bin/external/io_bazel_rules_go/stdlib_/src/os/user -fPIC -arch arm64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build2367661082/b036=/tmp/go-build -gno-record-gcc-switches -fno-common -o /tmp/go-build2367661082/b036/_cgo_.o /tmp/go-build2367661082/b036/_cgo_main.o /tmp/go-build2367661082/b036/_x001.o /tmp/go-build2367661082/b036/_x002.o /tmp/go-build2367661082/b036/_x003.o /tmp/go-build2367661082/b036/_x004.o -target aarch64-macos-gnu
root 5605 0.0 0.0 162316 26728 ? Sl 12:28 0:00 \_ /root/.cache/bazel/_bazel_root/cc8755609ad61864910f145119713de9/external/zig_sdk/zig c++ -I /root/.cache/bazel/_bazel_root/cc8755609ad61864910f145119713de9/sandbox/linux-sandbox/3/execroot/bazel-zig-cc/bazel-out/k8-fastbuild/bin/external/io_bazel_rules_go/stdlib_/src/net -fPIC -arch arm64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build2367661082/b087=/tmp/go-build -gno-record-gcc-switches -fno-common -o /tmp/go-build2367661082/b087/_cgo_.o /tmp/go-build2367661082/b087/_cgo_main.o /tmp/go-build2367661082/b087/_x001.o /tmp/go-build2367661082/b087/_x002.o /tmp/go-build2367661082/b087/_x003.o /tmp/go-build2367661082/b087/_x004.o /tmp/go-build2367661082/b087/_x005.o -target aarch64-macos-gnu
root@6cf98e48ebb0:/x# 

lslocks --output-all | grep zig

root@6cf98e48ebb0:/x# lslocks --output-all | grep -E 'BLOCKER|zig'
COMMAND PID TYPE SIZE MODE M START END PATH BLOCKER
zig 5605 FLOCK WRITE* 0 0 0 5598
zig 5598 FLOCK WRITE 0 0 0 
zig 5605 FLOCK WRITE* 0 0 0 5598
zig 5598 FLOCK WRITE 0 0 0 
zig 5598 FLOCK WRITE 0 0 0 
zig 5598 FLOCK WRITE 0 0 0 
zig 5598 FLOCK WRITE 0 0 0 
zig 5598 FLOCK WRITE 0 0 0 
zig 5598 FLOCK WRITE 0 0 0 
zig 5598 FLOCK WRITE 0 0 0 
zig 5598 FLOCK WRITE 0 0 0 
zig 5598 FLOCK WRITE 0 0 0 
zig 5598 FLOCK WRITE 0 0 0 
zig 5598 FLOCK WRITE 0 0 0 
zig 5598 FLOCK WRITE 0 0 0 
zig 5598 FLOCK WRITE 0 0 0 
zig 5598 FLOCK WRITE 0 0 0 
zig 5598 FLOCK WRITE 0 0 0 
zig 5598 FLOCK WRITE 0 0 0 
zig 5598 FLOCK WRITE 0 0 0 
zig 5598 FLOCK WRITE 0 0 0 
zig 5598 FLOCK WRITE 0 0 0 
zig 5598 FLOCK WRITE 0 0 0 
zig 5598 FLOCK WRITE 0 0 0 
zig 5598 FLOCK WRITE 0 0 0 
zig 5598 FLOCK WRITE 0 0 0 
zig 5598 FLOCK WRITE 0 0 0 
zig 5598 FLOCK WRITE 0 0 0 
zig 5598 FLOCK WRITE 0 0 0 
zig 5598 FLOCK WRITE 0 0 0 
zig 5598 FLOCK WRITE 0 0 0 
zig 5598 FLOCK WRITE 0 0 0 
zig 5598 FLOCK WRITE 0 0 0 
zig 5598 FLOCK WRITE 0 0 0 
zig 5598 FLOCK WRITE 0 0 0 
zig 5598 FLOCK WRITE 0 0 0 
zig 5598 FLOCK WRITE 0 0 0 
zig 5598 FLOCK WRITE 0 0 0 
zig 5598 FLOCK WRITE 0 0 0 
zig 5598 FLOCK WRITE 0 0 0 
zig 5598 FLOCK WRITE 0 0 0 
zig 5598 FLOCK WRITE* 0 0 0 5605
zig 5605 FLOCK WRITE 0 0 0 
zig 5598 FLOCK WRITE* 0 0 0 5605
zig 5605 FLOCK WRITE 0 0 0 
zig 5598 FLOCK WRITE 0 0 0 
root@6cf98e48ebb0:/x# 

gdb process 1

root@6cf98e48ebb0:/x# gdb -p 5598
GNU gdb (Debian 10.1-1.7) 10.1.90.20210103-git
Copyright (C) 2021 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<https://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
 <http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
Type "apropos word" to search for commands related to "word".
Attaching to process 5598
[New LWP 5599]
[New LWP 5600]
thread apply 
warning: Target and debugger are in different PID namespaces; thread lists and other data are likely unreliable. Connect to gdbserver inside the container.
0x000000000781bbae in sccp ()
(gdb) thread apply all bt

Thread 3 (LWP 5600 "zig"):
#0 0x00000000078093b3 in flock ()
#1 0x0000000002da4d4f in std.os.flock (fd=49, operation=2) at /home/motiejus/code/zig-bootstrap/zig/lib/std/os.zig:4373
#2 0x0000000002b503f5 in std.fs.Dir.createFileZ (self=..., sub_path_c=0x7f9b132cd7b0 "e6952993d9b2971d4f720b163e9e672c.txt", flags=...) at /home/motiejus/code/zig-bootstrap/zig/lib/std/fs.zig:983
#3 0x0000000002b4bbcb in std.fs.Dir.createFile (self=..., sub_path=..., flags=...) at /home/motiejus/code/zig-bootstrap/zig/lib/std/fs.zig:914
#4 0x0000000002b4715d in Cache.Manifest.hit (self=0x7f9b132d07c0) at /home/motiejus/code/zig-bootstrap/zig/src/Cache.zig:289
#5 0x0000000002df68ab in Compilation.updateCObject (comp=0x7f9b142e56b8, c_object=0x7f9b14301170, c_obj_prog_node=0x7ffdde1d6c90) at /home/motiejus/code/zig-bootstrap/zig/src/Compilation.zig:2622
#6 0x0000000002df6189 in Compilation.workerUpdateCObject (comp=0x7f9b142e56b8, c_object=0x7f9b14301170, progress_node=0x7ffdde1d6c90, wg=0x7f9b142e5b40) at /home/motiejus/code/zig-bootstrap/zig/src/Compilation.zig:2494
#7 0x0000000002df8aa9 in ThreadPool.Closure.runFn (runnable=0x7f9b142e6b00) at /home/motiejus/code/zig-bootstrap/zig/src/ThreadPool.zig:117
#8 0x0000000002be3338 in ThreadPool.Worker.run (worker=0x7f9b142e1408) at /home/motiejus/code/zig-bootstrap/zig/src/ThreadPool.zig:35
#9 0x0000000002be36e8 in std.Thread.MainFuncs.posixThreadMain (ctx=0x7f9b14337d60) at /home/motiejus/code/zig-bootstrap/zig/lib/std/Thread.zig:299
#10 0x000000000781d09c in start ()
#11 0x0000000000000000 in ?? ()

Thread 2 (LWP 5599 "zig"):
#0 0x00000000078093b3 in flock ()
#1 0x0000000002da4d4f in std.os.flock (fd=51, operation=2) at /home/motiejus/code/zig-bootstrap/zig/lib/std/os.zig:4373
#2 0x0000000002b503f5 in std.fs.Dir.createFileZ (self=..., sub_path_c=0x7f9b142cf7b0 "f322b09235a58afcec5f96313ce20bb3.txt", flags=...) at /home/motiejus/code/zig-bootstrap/zig/lib/std/fs.zig:983
#3 0x0000000002b4bbcb in std.fs.Dir.createFile (self=..., sub_path=..., flags=...) at /home/motiejus/code/zig-bootstrap/zig/lib/std/fs.zig:914
#4 0x0000000002b4715d in Cache.Manifest.hit (self=0x7f9b142d27c0) at /home/motiejus/code/zig-bootstrap/zig/src/Cache.zig:289
#5 0x0000000002df68ab in Compilation.updateCObject (comp=0x7f9b142e56b8, c_object=0x7f9b142d47f0, c_obj_prog_node=0x7ffdde1d6c90) at /home/motiejus/code/zig-bootstrap/zig/src/Compilation.zig:2622
#6 0x0000000002df6189 in Compilation.workerUpdateCObject (comp=0x7f9b142e56b8, c_object=0x7f9b142d47f0, progress_node=0x7ffdde1d6c90, wg=0x7f9b142e5b40) at /home/motiejus/code/zig-bootstrap/zig/src/Compilation.zig:2494
#7 0x0000000002df8aa9 in ThreadPool.Closure.runFn (runnable=0x7f9b142e6b40) at /home/motiejus/code/zig-bootstrap/zig/src/ThreadPool.zig:117
#8 0x0000000002be3338 in ThreadPool.Worker.run (worker=0x7f9b142e13d0) at /home/motiejus/code/zig-bootstrap/zig/src/ThreadPool.zig:35
#9 0x0000000002be36e8 in std.Thread.MainFuncs.posixThreadMain (ctx=0x7f9b14337d50) at /home/motiejus/code/zig-bootstrap/zig/lib/std/Thread.zig:299
#10 0x000000000781d09c in start ()
#11 0x0000000000000000 in ?? ()

Thread 1 (LWP 5598 "zig"):
#0 0x000000000781bbae in sccp ()
#1 0x000000000781c65d in __timedwait_cp ()
#2 0x0000000000000038 in ?? ()
#3 0x0000000000000000 in ?? ()
(gdb) 

gdb process 2

root@6cf98e48ebb0:/x# gdb -p 5605
GNU gdb (Debian 10.1-1.7) 10.1.90.20210103-git
Copyright (C) 2021 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<https://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
 <http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
Type "apropos word" to search for commands related to "word".
Attaching to process 5605
[New LWP 5606]
[New LWP 5607]

warning: Target and debugger are in different PID namespaces; thread lists and other data are likely unreliable. Connect to gdbserver inside the container.
0x000000000781bbae in sccp ()
(gdb) thread apply all bt

Thread 3 (LWP 5607 "zig"):
#0 0x00000000078093b3 in flock ()
#1 0x0000000002da4d4f in std.os.flock (fd=13, operation=2) at /home/motiejus/code/zig-bootstrap/zig/lib/std/os.zig:4373
#2 0x0000000002b503f5 in std.fs.Dir.createFileZ (self=..., sub_path_c=0x7fa6e4eb77b0 "aeee3b9656aecd6cbe1df612eb49381b.txt", flags=...) at /home/motiejus/code/zig-bootstrap/zig/lib/std/fs.zig:983
#3 0x0000000002b4bbcb in std.fs.Dir.createFile (self=..., sub_path=..., flags=...) at /home/motiejus/code/zig-bootstrap/zig/lib/std/fs.zig:914
#4 0x0000000002b4715d in Cache.Manifest.hit (self=0x7fa6e4eba7c0) at /home/motiejus/code/zig-bootstrap/zig/src/Cache.zig:289
#5 0x0000000002df68ab in Compilation.updateCObject (comp=0x7fa6e5ecf6b8, c_object=0x7fa6e5ebf440, c_obj_prog_node=0x7ffd767af6d0) at /home/motiejus/code/zig-bootstrap/zig/src/Compilation.zig:2622
#6 0x0000000002df6189 in Compilation.workerUpdateCObject (comp=0x7fa6e5ecf6b8, c_object=0x7fa6e5ebf440, progress_node=0x7ffd767af6d0, wg=0x7fa6e5ecfb40) at /home/motiejus/code/zig-bootstrap/zig/src/Compilation.zig:2494
#7 0x0000000002df8aa9 in ThreadPool.Closure.runFn (runnable=0x7fa6e5ebfcc0) at /home/motiejus/code/zig-bootstrap/zig/src/ThreadPool.zig:117
#8 0x0000000002be3338 in ThreadPool.Worker.run (worker=0x7fa6e5ecb408) at /home/motiejus/code/zig-bootstrap/zig/src/ThreadPool.zig:35
#9 0x0000000002be36e8 in std.Thread.MainFuncs.posixThreadMain (ctx=0x7fa6e5f21d60) at /home/motiejus/code/zig-bootstrap/zig/lib/std/Thread.zig:299
#10 0x000000000781d09c in start ()
#11 0x0000000000000000 in ?? ()

Thread 2 (LWP 5606 "zig"):
#0 0x00000000078093b3 in flock ()
#1 0x0000000002da4d4f in std.os.flock (fd=12, operation=2) at /home/motiejus/code/zig-bootstrap/zig/lib/std/os.zig:4373
#2 0x0000000002b503f5 in std.fs.Dir.createFileZ (self=..., sub_path_c=0x7fa6e5eb97b0 "18c5d15d382debc4dd4079a12f75e0a1.txt", flags=...) at /home/motiejus/code/zig-bootstrap/zig/lib/std/fs.zig:983
#3 0x0000000002b4bbcb in std.fs.Dir.createFile (self=..., sub_path=..., flags=...) at /home/motiejus/code/zig-bootstrap/zig/lib/std/fs.zig:914
#4 0x0000000002b4715d in Cache.Manifest.hit (self=0x7fa6e5ebc7c0) at /home/motiejus/code/zig-bootstrap/zig/src/Cache.zig:289
#5 0x0000000002df68ab in Compilation.updateCObject (comp=0x7fa6e5ecf6b8, c_object=0x7fa6e5ebf490, c_obj_prog_node=0x7ffd767af6d0) at /home/motiejus/code/zig-bootstrap/zig/src/Compilation.zig:2622
#6 0x0000000002df6189 in Compilation.workerUpdateCObject (comp=0x7fa6e5ecf6b8, c_object=0x7fa6e5ebf490, progress_node=0x7ffd767af6d0, wg=0x7fa6e5ecfb40) at /home/motiejus/code/zig-bootstrap/zig/src/Compilation.zig:2494
#7 0x0000000002df8aa9 in ThreadPool.Closure.runFn (runnable=0x7fa6e5ebfd00) at /home/motiejus/code/zig-bootstrap/zig/src/ThreadPool.zig:117
#8 0x0000000002be3338 in ThreadPool.Worker.run (worker=0x7fa6e5ecb3d0) at /home/motiejus/code/zig-bootstrap/zig/src/ThreadPool.zig:35
#9 0x0000000002be36e8 in std.Thread.MainFuncs.posixThreadMain (ctx=0x7fa6e5f21d50) at /home/motiejus/code/zig-bootstrap/zig/lib/std/Thread.zig:299
#10 0x000000000781d09c in start ()
#11 0x0000000000000000 in ?? ()

Thread 1 (LWP 5605 "zig"):
#0 0x000000000781bbae in sccp ()
#1 0x000000000781c65d in __timedwait_cp ()
#2 0x0000000000000038 in ?? ()
#3 0x0000000000000000 in ?? ()
(gdb) 

Not sure why the namespace warning is still there; I am running gdb inside the container.

This time I'm leaving these proceses to hang for further investigation. Let me know if there is something more I can try.

[motiejus]

lsof 5598 ("process 1")

root@6cf98e48ebb0:/x# lsof -p 5598
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
zig 5598 root cwd DIR 0,1501 4096 10490372 /root/.cache/bazel/_bazel_root/cc8755609ad61864910f145119713de9/sandbox/linux-sandbox/3/execroot/bazel-zig-cc
zig 5598 root rtd DIR 0,1501 4096 9830582 /
zig 5598 root txt REG 0,1501 184877896 10226850 /root/.cache/bazel/_bazel_root/cc8755609ad61864910f145119713de9/external/zig_sdk/zig
zig 5598 root mem REG 66,16 10226850 /root/.cache/bazel/_bazel_root/cc8755609ad61864910f145119713de9/external/zig_sdk/zig (path dev=0,1501)
zig 5598 root 0r CHR 1,3 0t0 233014089 /dev/null
zig 5598 root 1w FIFO 0,12 0t0 233220439 pipe
zig 5598 root 2w FIFO 0,12 0t0 233220439 pipe
zig 5598 root 3u DIR 0,1501 4096 10096918 /tmp/bazel-zig-cc
zig 5598 root 4u DIR 0,1501 4096 10356793 /root/.cache/bazel/_bazel_root/cc8755609ad61864910f145119713de9/external/zig_sdk/lib
zig 5598 root 5u DIR 0,1501 4096 10096918 /tmp/bazel-zig-cc
zig 5598 root 6u DIR 0,1501 12288 10096931 /tmp/bazel-zig-cc/h
zig 5598 root 7u DIR 0,1501 4096 14943861 /tmp/bazel-zig-cc/o/29fc05bd1a588c65c9f3f1914783feb9
zig 5598 root 8u DIR 0,1501 12288 10096931 /tmp/bazel-zig-cc/h
zig 5598 root 9u DIR 0,1501 4096 10227950 /tmp/bazel-zig-cc/o/fa537869cf0ef12d12daaf8210c67a8c
zig 5598 root 10uW REG 0,1501 32000 10097112 /tmp/bazel-zig-cc/h/18c5d15d382debc4dd4079a12f75e0a1.txt
zig 5598 root 11uW REG 0,1501 31809 10097113 /tmp/bazel-zig-cc/h/aeee3b9656aecd6cbe1df612eb49381b.txt
zig 5598 root 12uW REG 0,1501 32181 10098246 /tmp/bazel-zig-cc/h/67d6c9ffb54c8f0dcc6e5c5e272f66c2.txt
zig 5598 root 13uW REG 0,1501 21998 10098249 /tmp/bazel-zig-cc/h/e146b019f6b7823f94869aac599b995d.txt
zig 5598 root 14uW REG 0,1501 21636 10098257 /tmp/bazel-zig-cc/h/22732936d0435aa1d3cbd9558004fa7d.txt
zig 5598 root 15uW REG 0,1501 38447 10098264 /tmp/bazel-zig-cc/h/0ac2b6ea4037d239f5ce1a0c87c9703e.txt
zig 5598 root 16uW REG 0,1501 33804 10098298 /tmp/bazel-zig-cc/h/956213cc51abd27b2f58fc8720fd063e.txt
zig 5598 root 17uW REG 0,1501 382 10098273 /tmp/bazel-zig-cc/h/c558d923cae2aae4c6f1852e1a83c096.txt
zig 5598 root 18uW REG 0,1501 44077 10096891 /tmp/bazel-zig-cc/h/fe59a1a1c778ef0373e24fb30a3d5ceb.txt
zig 5598 root 19uW REG 0,1501 34144 10098284 /tmp/bazel-zig-cc/h/724facfa4300748904328995b709c629.txt
zig 5598 root 20uW REG 0,1501 39138 10098289 /tmp/bazel-zig-cc/h/3ff7ca3b88a1b3f80b588d39dd1ec269.txt
zig 5598 root 21uW REG 0,1501 33980 10098325 /tmp/bazel-zig-cc/h/e4ea22f9c335f32574fc04246bbe0b2a.txt
zig 5598 root 22uW REG 0,1501 40012 10098359 /tmp/bazel-zig-cc/h/86b2178f4465f96d6804349130089c77.txt
zig 5598 root 23uW REG 0,1501 37536 10098327 /tmp/bazel-zig-cc/h/7c500680b3fa8baa8c7fff2324e41a8b.txt
zig 5598 root 24uW REG 0,1501 35412 10098335 /tmp/bazel-zig-cc/h/5f2de41003fe76f7c5d9aed9b003b0ed.txt
zig 5598 root 25uW REG 0,1501 31303 10098378 /tmp/bazel-zig-cc/h/5e34d479e7112a43571191f26c6cab2b.txt
zig 5598 root 26uW REG 0,1501 31304 10098357 /tmp/bazel-zig-cc/h/5d6e930b20979aae2b34f39ded0f1d9c.txt
zig 5598 root 27uW REG 0,1501 34147 10098391 /tmp/bazel-zig-cc/h/350e15054b17e84fd8aba996819d8945.txt
zig 5598 root 28uW REG 0,1501 21079 10098382 /tmp/bazel-zig-cc/h/33ed3825f1fdd283eef9e25aef6bd431.txt
zig 5598 root 29uW REG 0,1501 44078 10098430 /tmp/bazel-zig-cc/h/ba32123a89a019dd21577926a30c54df.txt
zig 5598 root 30uW REG 0,1501 34324 10098400 /tmp/bazel-zig-cc/h/3b2245b507ac568035dd34c555b16f56.txt
zig 5598 root 31uW REG 0,1501 44839 10098422 /tmp/bazel-zig-cc/h/7b342b1bf9e933782f20406c3e26f805.txt
zig 5598 root 32uW REG 0,1501 45156 10098442 /tmp/bazel-zig-cc/h/58703fc6d766dc8332d29c225e903924.txt
zig 5598 root 33uW REG 0,1501 36999 10098438 /tmp/bazel-zig-cc/h/df7ef0f36afe0c51eaa57367222c2eff.txt
zig 5598 root 34uW REG 0,1501 49280 10098487 /tmp/bazel-zig-cc/h/1fe48363f68a9920b2d645fe94e5059c.txt
zig 5598 root 35uW REG 0,1501 32179 10098459 /tmp/bazel-zig-cc/h/2b501604209ee6b83f861f4f2d349c7c.txt
zig 5598 root 36uW REG 0,1501 34311 10098468 /tmp/bazel-zig-cc/h/30b5685079aa81e90a74e305938525af.txt
zig 5598 root 37uW REG 0,1501 30940 10098477 /tmp/bazel-zig-cc/h/2b93caa735da77046cd278809938f920.txt
zig 5598 root 38uW REG 0,1501 2864 10098496 /tmp/bazel-zig-cc/h/e644e8d016106d2bf5bfa9ff9f05ae09.txt
zig 5598 root 39uW REG 0,1501 21105 10098544 /tmp/bazel-zig-cc/h/88a57927245d2d9e2454d75530193d00.txt
zig 5598 root 40uW REG 0,1501 49310 10098504 /tmp/bazel-zig-cc/h/74c9940e5ceab29cd40c2ceba73d5c1b.txt
zig 5598 root 41uW REG 0,1501 31561 10098518 /tmp/bazel-zig-cc/h/7893f9324e214c2aebd5f4d3585bb5af.txt
zig 5598 root 42uW REG 0,1501 22587 10098530 /tmp/bazel-zig-cc/h/76d081df52185daee610b741ca96cb72.txt
zig 5598 root 43uW REG 0,1501 34683 10098536 /tmp/bazel-zig-cc/h/49ecae609e51b2d4b6d170cdd8a7d429.txt
zig 5598 root 44uW REG 0,1501 34172 10098551 /tmp/bazel-zig-cc/h/99b7c72521c5fbbe31d50d4ee7bf7eb8.txt
zig 5598 root 45uW REG 0,1501 49292 10098567 /tmp/bazel-zig-cc/h/3629e745f59ad2f18c43a557ffb09fcc.txt
zig 5598 root 46uW REG 0,1501 23624 10098573 /tmp/bazel-zig-cc/h/e7d557bfb26e7c5dec5fca9facff6fa7.txt
zig 5598 root 47uW REG 0,1501 30928 10098584 /tmp/bazel-zig-cc/h/2d100d6a538b5a3ae3f0f21100a7eb45.txt
zig 5598 root 48uW REG 0,1501 34140 10098593 /tmp/bazel-zig-cc/h/72237618865593f06209d00c90d67d1c.txt
zig 5598 root 49u REG 0,1501 31465 10098623 /tmp/bazel-zig-cc/h/e6952993d9b2971d4f720b163e9e672c.txt
zig 5598 root 50uW REG 0,1501 30934 10098599 /tmp/bazel-zig-cc/h/b10937b28bd9977b449745c634f47c5d.txt
zig 5598 root 51u REG 0,1501 31107 10098615 /tmp/bazel-zig-cc/h/f322b09235a58afcec5f96313ce20bb3.txt
root@6cf98e48ebb0:/x# 

lsof 5605 ("process 2")

root@6cf98e48ebb0:/x# lsof -p 5605
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
zig 5605 root cwd DIR 0,1501 4096 10490372 /root/.cache/bazel/_bazel_root/cc8755609ad61864910f145119713de9/sandbox/linux-sandbox/3/execroot/bazel-zig-cc
zig 5605 root rtd DIR 0,1501 4096 9830582 /
zig 5605 root txt REG 0,1501 184877896 10226850 /root/.cache/bazel/_bazel_root/cc8755609ad61864910f145119713de9/external/zig_sdk/zig
zig 5605 root mem REG 66,16 10226850 /root/.cache/bazel/_bazel_root/cc8755609ad61864910f145119713de9/external/zig_sdk/zig (path dev=0,1501)
zig 5605 root 0r CHR 1,3 0t0 233014089 /dev/null
zig 5605 root 1w FIFO 0,12 0t0 233212540 pipe
zig 5605 root 2w FIFO 0,12 0t0 233212540 pipe
zig 5605 root 3u DIR 0,1501 4096 10096918 /tmp/bazel-zig-cc
zig 5605 root 4u DIR 0,1501 4096 10356793 /root/.cache/bazel/_bazel_root/cc8755609ad61864910f145119713de9/external/zig_sdk/lib
zig 5605 root 5u DIR 0,1501 4096 10096918 /tmp/bazel-zig-cc
zig 5605 root 6u DIR 0,1501 12288 10096931 /tmp/bazel-zig-cc/h
zig 5605 root 7u DIR 0,1501 4096 14943976 /tmp/bazel-zig-cc/o/88e75e6c22007217207558dfa5cd8f06
zig 5605 root 8u DIR 0,1501 12288 10096931 /tmp/bazel-zig-cc/h
zig 5605 root 9u DIR 0,1501 4096 10227950 /tmp/bazel-zig-cc/o/fa537869cf0ef12d12daaf8210c67a8c
zig 5605 root 10uW REG 0,1501 31107 10098615 /tmp/bazel-zig-cc/h/f322b09235a58afcec5f96313ce20bb3.txt
zig 5605 root 11uW REG 0,1501 31465 10098623 /tmp/bazel-zig-cc/h/e6952993d9b2971d4f720b163e9e672c.txt
zig 5605 root 12u REG 0,1501 32000 10097112 /tmp/bazel-zig-cc/h/18c5d15d382debc4dd4079a12f75e0a1.txt
zig 5605 root 13u REG 0,1501 31809 10097113 /tmp/bazel-zig-cc/h/aeee3b9656aecd6cbe1df612eb49381b.txt
root@6cf98e48ebb0:/x# 

[motiejus]

For the record, I still have the (quite powerful) VM hanging around with the stuck processes, if you need any more info.

Once there is a patch, I am happy to re-run the tests with the patch.

[motiejus]

Putting the files as requested over IRC.

18c5d15d382debc4dd4079a12f75e0a1.txt
aeee3b9656aecd6cbe1df612eb49381b.txt
e6952993d9b2971d4f720b163e9e672c.txt
f322b09235a58afcec5f96313ce20bb3.txt

[andrewrk]

18c5d15d382debc4dd4079a12f75e0a1.txt

File being compiled: lib/libcxx/src/vector.cpp

aeee3b9656aecd6cbe1df612eb49381b.txt

File being compiled: lib/libcxx/src/variant.cpp

e6952993d9b2971d4f720b163e9e672c.txt

File being compiled: lib/libcxx/src/algorithm.cpp

f322b09235a58afcec5f96313ce20bb3.txt

File being compiled: lib/libcxx/src/any.cpp