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Total runtime reports 0ms when the per-file rm fork is removed: 'cannot duplicate fd 3 to fd 0' #1271

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Total runtime reports 0ms when the per-file rm fork is removed: 'cannot duplicate fd 3 to fd 0'#1271
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@Chemaclass
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opened on Aug 15, 2026

What happens

bashunit::cleanup_script_temp_files forks rm -rf <glob> once per test file, unconditionally, even when nothing matches. Removing that fork — the obvious follow-up to #1269, worth about 3.4ms per file — makes the final total-runtime calculation fail:

src/util/math.sh: line 7: echo: write error: Broken pipe
src/util/math.sh: cannot duplicate fd 3 to fd 0: Bad file descriptor
Time taken: 0ms

Every test still passes and the exit code is 0. Only the reported duration is wrong, so it fails silently.

Reproduction

Apply the marker probe from #1269 to the script-level twin:

functionbashunit::cleanup_script_temp_files() {
if [ -n"${BASHUNIT_CURRENT_SCRIPT_ID:-}" ];thenif [ !-e"$BASHUNIT_TEMP_DIR/${BASHUNIT_CURRENT_SCRIPT_ID}_.mark" ];thenreturn 0
fi
rm -rf "$BASHUNIT_TEMP_DIR/${BASHUNIT_CURRENT_SCRIPT_ID}"_*fi
}

Then run a directory of trivial test files, --no-parallel. Threshold is between 20 and 60 files; at 60+ it reproduces every time.

What it is not

  • Not the early return — putting any fork on the skip path (rm -rf "$BASHUNIT_TEMP_DIR/.__no_such_probe__") makes it go away, and the run is correct again at 3.46s.
  • Not baseline behaviour — current main is clean at 60, 100 and 400 files.
  • Not reproducible standalone: exec 3>&1; exec 3>&-; echo "1+1" | bc works on both bash 3.2 and 5.3.

So it depends on the fd state bashunit itself leaves behind. run_test is the only place that touches fd 3 (exec 3>&1 at entry, exec 3>&- before the duration block), and the failing call is the echo | bc in bashunit::math::calculate, where bash picks fd 3 to stage the pipe.

Why it matters

Two reasons, beyond the blocked optimisation:

  1. Time taken can be silently wrong. A user sees 0ms for a real run and has no indication anything failed.
  2. bashunit::math::calculate is used elsewhere (coverage percentages). If a pipe can fail this way here, it can fail there — and a wrong percentage is worse than a wrong clock.

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Total runtime reports 0ms when the per-file rm fork is removed: 'cannot duplicate fd 3 to fd 0' · Issue #1271 · TypedDevs/bashunit · GitHub
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Total runtime reports 0ms when the per-file rm fork is removed: 'cannot duplicate fd 3 to fd 0' #1271
Closed
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Total runtime reports 0ms when the per-file rm fork is removed: 'cannot duplicate fd 3 to fd 0'#1271
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bugSomething isn't working
Description
@Chemaclass
Chemaclass
opened on Aug 15, 2026
What happens
bashunit::cleanup_script_temp_files forks rm -rf <glob> once per test file, unconditionally, even when nothing matches. Removing that fork — the obvious follow-up to #1269, worth about 3.4ms per file — makes the final total-runtime calculation fail:
src/util/math.sh: line 7: echo: write error: Broken pipe
src/util/math.sh: cannot duplicate fd 3 to fd 0: Bad file descriptor
Time taken: 0ms

Every test still passes and the exit code is 0. Only the reported duration is wrong, so it fails silently.
Reproduction
Apply the marker probe from #1269 to the script-level twin:
functionbashunit::cleanup_script_temp_files() {
if [ -n"${BASHUNIT_CURRENT_SCRIPT_ID:-}" ];thenif [ !-e"$BASHUNIT_TEMP_DIR/${BASHUNIT_CURRENT_SCRIPT_ID}_.mark" ];thenreturn 0
fi
rm -rf "$BASHUNIT_TEMP_DIR/${BASHUNIT_CURRENT_SCRIPT_ID}"_*fi
}
Then run a directory of trivial test files, --no-parallel. Threshold is between 20 and 60 files; at 60+ it reproduces every time.
What it is not
  • Not the early return — putting any fork on the skip path (rm -rf "$BASHUNIT_TEMP_DIR/.__no_such_probe__") makes it go away, and the run is correct again at 3.46s.
  • Not baseline behaviour — current main is clean at 60, 100 and 400 files.
  • Not reproducible standalone: exec 3>&1; exec 3>&-; echo "1+1" | bc works on both bash 3.2 and 5.3.
So it depends on the fd state bashunit itself leaves behind. run_test is the only place that touches fd 3 (exec 3>&1 at entry, exec 3>&- before the duration block), and the failing call is the echo | bc in bashunit::math::calculate, where bash picks fd 3 to stage the pipe.
Why it matters
Two reasons, beyond the blocked optimisation:
  1. Time taken can be silently wrong. A user sees 0ms for a real run and has no indication anything failed.
  2. bashunit::math::calculate is used elsewhere (coverage percentages). If a pipe can fail this way here, it can fail there — and a wrong percentage is worse than a wrong clock.
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})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
Total runtime reports 0ms when the per-file rm fork is removed: 'cannot duplicate fd 3 to fd 0' · Issue #1271 · TypedDevs/bashunit · GitHub
Skip to content
Total runtime reports 0ms when the per-file rm fork is removed: 'cannot duplicate fd 3 to fd 0' #1271
Closed
Closed
Total runtime reports 0ms when the per-file rm fork is removed: 'cannot duplicate fd 3 to fd 0'#1271
Assignees
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Labels
bugSomething isn't working
Description
@Chemaclass
Chemaclass
opened on Aug 15, 2026
What happens
bashunit::cleanup_script_temp_files forks rm -rf <glob> once per test file, unconditionally, even when nothing matches. Removing that fork — the obvious follow-up to #1269, worth about 3.4ms per file — makes the final total-runtime calculation fail:
src/util/math.sh: line 7: echo: write error: Broken pipe
src/util/math.sh: cannot duplicate fd 3 to fd 0: Bad file descriptor
Time taken: 0ms

Every test still passes and the exit code is 0. Only the reported duration is wrong, so it fails silently.
Reproduction
Apply the marker probe from #1269 to the script-level twin:
functionbashunit::cleanup_script_temp_files() {
if [ -n"${BASHUNIT_CURRENT_SCRIPT_ID:-}" ];thenif [ !-e"$BASHUNIT_TEMP_DIR/${BASHUNIT_CURRENT_SCRIPT_ID}_.mark" ];thenreturn 0
fi
rm -rf "$BASHUNIT_TEMP_DIR/${BASHUNIT_CURRENT_SCRIPT_ID}"_*fi
}
Then run a directory of trivial test files, --no-parallel. Threshold is between 20 and 60 files; at 60+ it reproduces every time.
What it is not
  • Not the early return — putting any fork on the skip path (rm -rf "$BASHUNIT_TEMP_DIR/.__no_such_probe__") makes it go away, and the run is correct again at 3.46s.
  • Not baseline behaviour — current main is clean at 60, 100 and 400 files.
  • Not reproducible standalone: exec 3>&1; exec 3>&-; echo "1+1" | bc works on both bash 3.2 and 5.3.
So it depends on the fd state bashunit itself leaves behind. run_test is the only place that touches fd 3 (exec 3>&1 at entry, exec 3>&- before the duration block), and the failing call is the echo | bc in bashunit::math::calculate, where bash picks fd 3 to stage the pipe.
Why it matters
Two reasons, beyond the blocked optimisation:
  1. Time taken can be silently wrong. A user sees 0ms for a real run and has no indication anything failed.
  2. bashunit::math::calculate is used elsewhere (coverage percentages). If a pipe can fail this way here, it can fail there — and a wrong percentage is worse than a wrong clock.
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  • bashunit
    Status
    Done
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(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
Total runtime reports 0ms when the per-file rm fork is removed: 'cannot duplicate fd 3 to fd 0' · Issue #1271 · TypedDevs/bashunit · GitHub
Skip to content
Total runtime reports 0ms when the per-file rm fork is removed: 'cannot duplicate fd 3 to fd 0' #1271
Closed
Closed
Total runtime reports 0ms when the per-file rm fork is removed: 'cannot duplicate fd 3 to fd 0'#1271
Assignees
Chemaclass
Labels
bugSomething isn't working
Description
@Chemaclass
Chemaclass
opened on Aug 15, 2026
What happens
bashunit::cleanup_script_temp_files forks rm -rf <glob> once per test file, unconditionally, even when nothing matches. Removing that fork — the obvious follow-up to #1269, worth about 3.4ms per file — makes the final total-runtime calculation fail:
src/util/math.sh: line 7: echo: write error: Broken pipe
src/util/math.sh: cannot duplicate fd 3 to fd 0: Bad file descriptor
Time taken: 0ms

Every test still passes and the exit code is 0. Only the reported duration is wrong, so it fails silently.
Reproduction
Apply the marker probe from #1269 to the script-level twin:
functionbashunit::cleanup_script_temp_files() {
if [ -n"${BASHUNIT_CURRENT_SCRIPT_ID:-}" ];thenif [ !-e"$BASHUNIT_TEMP_DIR/${BASHUNIT_CURRENT_SCRIPT_ID}_.mark" ];thenreturn 0
fi
rm -rf "$BASHUNIT_TEMP_DIR/${BASHUNIT_CURRENT_SCRIPT_ID}"_*fi
}
Then run a directory of trivial test files, --no-parallel. Threshold is between 20 and 60 files; at 60+ it reproduces every time.
What it is not
  • Not the early return — putting any fork on the skip path (rm -rf "$BASHUNIT_TEMP_DIR/.__no_such_probe__") makes it go away, and the run is correct again at 3.46s.
  • Not baseline behaviour — current main is clean at 60, 100 and 400 files.
  • Not reproducible standalone: exec 3>&1; exec 3>&-; echo "1+1" | bc works on both bash 3.2 and 5.3.
So it depends on the fd state bashunit itself leaves behind. run_test is the only place that touches fd 3 (exec 3>&1 at entry, exec 3>&- before the duration block), and the failing call is the echo | bc in bashunit::math::calculate, where bash picks fd 3 to stage the pipe.
Why it matters
Two reasons, beyond the blocked optimisation:
  1. Time taken can be silently wrong. A user sees 0ms for a real run and has no indication anything failed.
  2. bashunit::math::calculate is used elsewhere (coverage percentages). If a pipe can fail this way here, it can fail there — and a wrong percentage is worse than a wrong clock.
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bugSomething isn't working
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  • bashunit
    Status
    Done
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
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})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '
Total runtime reports 0ms when the per-file rm fork is removed: 'cannot duplicate fd 3 to fd 0' · Issue #1271 · TypedDevs/bashunit · GitHub
Skip to content
Total runtime reports 0ms when the per-file rm fork is removed: 'cannot duplicate fd 3 to fd 0' #1271
Closed
Closed
Total runtime reports 0ms when the per-file rm fork is removed: 'cannot duplicate fd 3 to fd 0'#1271
Assignees
Chemaclass
Labels
bugSomething isn't working
Description
@Chemaclass
Chemaclass
opened on Aug 15, 2026
What happens
bashunit::cleanup_script_temp_files forks rm -rf <glob> once per test file, unconditionally, even when nothing matches. Removing that fork — the obvious follow-up to #1269, worth about 3.4ms per file — makes the final total-runtime calculation fail:
src/util/math.sh: line 7: echo: write error: Broken pipe
src/util/math.sh: cannot duplicate fd 3 to fd 0: Bad file descriptor
Time taken: 0ms

Every test still passes and the exit code is 0. Only the reported duration is wrong, so it fails silently.
Reproduction
Apply the marker probe from #1269 to the script-level twin:
functionbashunit::cleanup_script_temp_files() {
if [ -n"${BASHUNIT_CURRENT_SCRIPT_ID:-}" ];thenif [ !-e"$BASHUNIT_TEMP_DIR/${BASHUNIT_CURRENT_SCRIPT_ID}_.mark" ];thenreturn 0
fi
rm -rf "$BASHUNIT_TEMP_DIR/${BASHUNIT_CURRENT_SCRIPT_ID}"_*fi
}
Then run a directory of trivial test files, --no-parallel. Threshold is between 20 and 60 files; at 60+ it reproduces every time.
What it is not
  • Not the early return — putting any fork on the skip path (rm -rf "$BASHUNIT_TEMP_DIR/.__no_such_probe__") makes it go away, and the run is correct again at 3.46s.
  • Not baseline behaviour — current main is clean at 60, 100 and 400 files.
  • Not reproducible standalone: exec 3>&1; exec 3>&-; echo "1+1" | bc works on both bash 3.2 and 5.3.
So it depends on the fd state bashunit itself leaves behind. run_test is the only place that touches fd 3 (exec 3>&1 at entry, exec 3>&- before the duration block), and the failing call is the echo | bc in bashunit::math::calculate, where bash picks fd 3 to stage the pipe.
Why it matters
Two reasons, beyond the blocked optimisation:
  1. Time taken can be silently wrong. A user sees 0ms for a real run and has no indication anything failed.
  2. bashunit::math::calculate is used elsewhere (coverage percentages). If a pipe can fail this way here, it can fail there — and a wrong percentage is worse than a wrong clock.
Metadata
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, 'i');
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// Auto-enable theater mode on YouTube
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var __m = "*";
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Total runtime reports 0ms when the per-file rm fork is removed: 'cannot duplicate fd 3 to fd 0' · Issue #1271 · TypedDevs/bashunit · GitHub
Skip to content
Total runtime reports 0ms when the per-file rm fork is removed: 'cannot duplicate fd 3 to fd 0' #1271
Closed
Closed
Total runtime reports 0ms when the per-file rm fork is removed: 'cannot duplicate fd 3 to fd 0'#1271
Assignees
Chemaclass
Labels
bugSomething isn't working
Description
@Chemaclass
Chemaclass
opened on Aug 15, 2026
What happens
bashunit::cleanup_script_temp_files forks rm -rf <glob> once per test file, unconditionally, even when nothing matches. Removing that fork — the obvious follow-up to #1269, worth about 3.4ms per file — makes the final total-runtime calculation fail:
src/util/math.sh: line 7: echo: write error: Broken pipe
src/util/math.sh: cannot duplicate fd 3 to fd 0: Bad file descriptor
Time taken: 0ms

Every test still passes and the exit code is 0. Only the reported duration is wrong, so it fails silently.
Reproduction
Apply the marker probe from #1269 to the script-level twin:
functionbashunit::cleanup_script_temp_files() {
if [ -n"${BASHUNIT_CURRENT_SCRIPT_ID:-}" ];thenif [ !-e"$BASHUNIT_TEMP_DIR/${BASHUNIT_CURRENT_SCRIPT_ID}_.mark" ];thenreturn 0
fi
rm -rf "$BASHUNIT_TEMP_DIR/${BASHUNIT_CURRENT_SCRIPT_ID}"_*fi
}
Then run a directory of trivial test files, --no-parallel. Threshold is between 20 and 60 files; at 60+ it reproduces every time.
What it is not
  • Not the early return — putting any fork on the skip path (rm -rf "$BASHUNIT_TEMP_DIR/.__no_such_probe__") makes it go away, and the run is correct again at 3.46s.
  • Not baseline behaviour — current main is clean at 60, 100 and 400 files.
  • Not reproducible standalone: exec 3>&1; exec 3>&-; echo "1+1" | bc works on both bash 3.2 and 5.3.
So it depends on the fd state bashunit itself leaves behind. run_test is the only place that touches fd 3 (exec 3>&1 at entry, exec 3>&- before the duration block), and the failing call is the echo | bc in bashunit::math::calculate, where bash picks fd 3 to stage the pipe.
Why it matters
Two reasons, beyond the blocked optimisation:
  1. Time taken can be silently wrong. A user sees 0ms for a real run and has no indication anything failed.
  2. bashunit::math::calculate is used elsewhere (coverage percentages). If a pipe can fail this way here, it can fail there — and a wrong percentage is worse than a wrong clock.
Metadata
Metadata
Assignees
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bugSomething isn't working
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  • bashunit
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    Done
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// Remove or un-stick sticky/fixed headers that block content
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document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
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var __re = new RegExp('^' + ".*" + '
Total runtime reports 0ms when the per-file rm fork is removed: 'cannot duplicate fd 3 to fd 0' · Issue #1271 · TypedDevs/bashunit · GitHub
Skip to content
Total runtime reports 0ms when the per-file rm fork is removed: 'cannot duplicate fd 3 to fd 0' #1271
Closed
Closed
Total runtime reports 0ms when the per-file rm fork is removed: 'cannot duplicate fd 3 to fd 0'#1271
Assignees
Chemaclass
Labels
bugSomething isn't working
Description
@Chemaclass
Chemaclass
opened on Aug 15, 2026
What happens
bashunit::cleanup_script_temp_files forks rm -rf <glob> once per test file, unconditionally, even when nothing matches. Removing that fork — the obvious follow-up to #1269, worth about 3.4ms per file — makes the final total-runtime calculation fail:
src/util/math.sh: line 7: echo: write error: Broken pipe
src/util/math.sh: cannot duplicate fd 3 to fd 0: Bad file descriptor
Time taken: 0ms

Every test still passes and the exit code is 0. Only the reported duration is wrong, so it fails silently.
Reproduction
Apply the marker probe from #1269 to the script-level twin:
functionbashunit::cleanup_script_temp_files() {
if [ -n"${BASHUNIT_CURRENT_SCRIPT_ID:-}" ];thenif [ !-e"$BASHUNIT_TEMP_DIR/${BASHUNIT_CURRENT_SCRIPT_ID}_.mark" ];thenreturn 0
fi
rm -rf "$BASHUNIT_TEMP_DIR/${BASHUNIT_CURRENT_SCRIPT_ID}"_*fi
}
Then run a directory of trivial test files, --no-parallel. Threshold is between 20 and 60 files; at 60+ it reproduces every time.
What it is not
  • Not the early return — putting any fork on the skip path (rm -rf "$BASHUNIT_TEMP_DIR/.__no_such_probe__") makes it go away, and the run is correct again at 3.46s.
  • Not baseline behaviour — current main is clean at 60, 100 and 400 files.
  • Not reproducible standalone: exec 3>&1; exec 3>&-; echo "1+1" | bc works on both bash 3.2 and 5.3.
So it depends on the fd state bashunit itself leaves behind. run_test is the only place that touches fd 3 (exec 3>&1 at entry, exec 3>&- before the duration block), and the failing call is the echo | bc in bashunit::math::calculate, where bash picks fd 3 to stage the pipe.
Why it matters
Two reasons, beyond the blocked optimisation:
  1. Time taken can be silently wrong. A user sees 0ms for a real run and has no indication anything failed.
  2. bashunit::math::calculate is used elsewhere (coverage percentages). If a pipe can fail this way here, it can fail there — and a wrong percentage is worse than a wrong clock.
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Total runtime reports 0ms when the per-file rm fork is removed: 'cannot duplicate fd 3 to fd 0' · Issue #1271 · TypedDevs/bashunit · GitHub
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Total runtime reports 0ms when the per-file rm fork is removed: 'cannot duplicate fd 3 to fd 0' #1271
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Total runtime reports 0ms when the per-file rm fork is removed: 'cannot duplicate fd 3 to fd 0'#1271
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@Chemaclass
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opened on Aug 15, 2026
What happens
bashunit::cleanup_script_temp_files forks rm -rf <glob> once per test file, unconditionally, even when nothing matches. Removing that fork — the obvious follow-up to #1269, worth about 3.4ms per file — makes the final total-runtime calculation fail:
src/util/math.sh: line 7: echo: write error: Broken pipe
src/util/math.sh: cannot duplicate fd 3 to fd 0: Bad file descriptor
Time taken: 0ms

Every test still passes and the exit code is 0. Only the reported duration is wrong, so it fails silently.
Reproduction
Apply the marker probe from #1269 to the script-level twin:
functionbashunit::cleanup_script_temp_files() {
if [ -n"${BASHUNIT_CURRENT_SCRIPT_ID:-}" ];thenif [ !-e"$BASHUNIT_TEMP_DIR/${BASHUNIT_CURRENT_SCRIPT_ID}_.mark" ];thenreturn 0
fi
rm -rf "$BASHUNIT_TEMP_DIR/${BASHUNIT_CURRENT_SCRIPT_ID}"_*fi
}
Then run a directory of trivial test files, --no-parallel. Threshold is between 20 and 60 files; at 60+ it reproduces every time.
What it is not
  • Not the early return — putting any fork on the skip path (rm -rf "$BASHUNIT_TEMP_DIR/.__no_such_probe__") makes it go away, and the run is correct again at 3.46s.
  • Not baseline behaviour — current main is clean at 60, 100 and 400 files.
  • Not reproducible standalone: exec 3>&1; exec 3>&-; echo "1+1" | bc works on both bash 3.2 and 5.3.
So it depends on the fd state bashunit itself leaves behind. run_test is the only place that touches fd 3 (exec 3>&1 at entry, exec 3>&- before the duration block), and the failing call is the echo | bc in bashunit::math::calculate, where bash picks fd 3 to stage the pipe.
Why it matters
Two reasons, beyond the blocked optimisation:
  1. Time taken can be silently wrong. A user sees 0ms for a real run and has no indication anything failed.
  2. bashunit::math::calculate is used elsewhere (coverage percentages). If a pipe can fail this way here, it can fail there — and a wrong percentage is worse than a wrong clock.
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