GH-91079: Fix stack overflow on AMD LTO linux

[markshannon]

In #130007 we increased the default stack size from an estimated 4MB to 5MB.
This PR resets it to 3M.

This is a temporary fix until #130396 is implemented

• Issue: Implement stack overflow protection for supported platforms #91079

[markshannon]

!buildbot fedora lto

[bedevere-bot]

The regex 'fedora lto' did not match any buildbot builder. Is the requested builder in the list of stable builders?

[markshannon]

!buildbot "AMD64 Fedora Stable LTO"

[bedevere-bot]

The regex '"AMD64 Fedora Stable LTO"' did not match any buildbot builder. Is the requested builder in the list of stable builders?

[markshannon]

!buildbot LTO

[bedevere-bot]

🤖 New build scheduled with the buildbot fleet by @markshannon for commit efef9bd 🤖

Results will be shown at:

https://buildbot.python.org/all/#/grid?branch=refs%2Fpull%2F130369%2Fmerge

The command will test the builders whose names match following regular expression: LTO

The builders matched are:

• PPC64LE CentOS9 LTO PR
• AMD64 Fedora Rawhide LTO PR
• s390x RHEL8 LTO + PGO PR
• aarch64 Fedora Rawhide LTO PR
• s390x RHEL9 LTO PR
• PPC64LE CentOS9 LTO + PGO PR
• AMD64 Fedora Stable LTO PR
• aarch64 CentOS9 LTO PR
• aarch64 Fedora Stable LTO PR
• AMD64 Fedora Rawhide LTO + PGO PR
• s390x RHEL8 LTO PR
• AMD64 CentOS9 LTO + PGO PR
• PPC64LE Fedora Stable LTO PR
• PPC64LE Fedora Rawhide LTO + PGO PR
• AMD64 RHEL8 LTO PR
• PPC64LE Fedora Stable LTO + PGO PR
• AMD64 RHEL8 LTO + PGO PR
• PPC64LE RHEL8 LTO + PGO PR
• s390x RHEL9 LTO + PGO PR
• PPC64LE RHEL8 LTO PR
• AMD64 CentOS9 LTO PR
• aarch64 Fedora Rawhide LTO + PGO PR
• PPC64LE Fedora Rawhide LTO PR
• aarch64 Fedora Stable LTO + PGO PR
• AMD64 Fedora Stable LTO + PGO PR
• aarch64 RHEL8 LTO + PGO PR
• aarch64 RHEL8 LTO PR
• aarch64 CentOS9 LTO + PGO PR

[brandtbucher]

Seems good.

[markshannon]

!buildbot Fedora.*LTO

[bedevere-bot]

🤖 New build scheduled with the buildbot fleet by @markshannon for commit 2aa6878 🤖

Results will be shown at:

https://buildbot.python.org/all/#/grid?branch=refs%2Fpull%2F130369%2Fmerge

The command will test the builders whose names match following regular expression: Fedora.*LTO

The builders matched are:

• aarch64 Fedora Stable LTO + PGO PR
• PPC64LE Fedora Stable LTO + PGO PR
• AMD64 Fedora Rawhide LTO PR
• AMD64 Fedora Stable LTO + PGO PR
• AMD64 Fedora Rawhide LTO + PGO PR
• aarch64 Fedora Rawhide LTO PR
• AMD64 Fedora Stable LTO PR
• PPC64LE Fedora Stable LTO PR
• PPC64LE Fedora Rawhide LTO + PGO PR
• aarch64 Fedora Rawhide LTO + PGO PR
• aarch64 Fedora Stable LTO PR
• PPC64LE Fedora Rawhide LTO PR

[markshannon]

#130398 fixes the same issue and a lot more.