** Changed in: glibc (Ubuntu)
Status: Triaged => Fix Committed
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https://bugs.launchpad.net/bugs/2121834
Title:
glibc 2.42-0ubuntu1 fails to start the thread on kernel < 6.13
Status in glibc package in Ubuntu:
Fix Committed
Bug description:
The issue was detected when building openjdk-17[1].
The bug occurs due to the introduction of a new guard mechanism[2]
ALLOCATE_GUARD_MADV_GUARD.
This is a default value for the stack protection guard (0) and it is
unchanged when the thread is created with 0 size guard area[3]. The stack block
is added to the list of the stacks in use[4].
The first thread runs its course and exits.
When the subsequent thread is created with non-zero guard area, the existing
stack can be reused[5].
It has ALLOCATE_GUARD_MADV_GUARD stack protection flag set, but the kernel
does not support it. adjust_stack_prot function will try to adjust the guard
area[6], but the call will fail with EINVAL.
The client application will fail to create the thread.
This breaks OpenJDK and other multithreaded applications running glibc
2.42-0ubuntu1 on kernels < 6.13.
[1]
https://launchpad.net/ubuntu/+source/openjdk-17/17.0.17~5ea-1/+build/31115316
[2]
https://github.com/bminor/glibc/commit/a6fbe36b7f31292981422692236465ab56670ea9
[3]
https://github.com/bminor/glibc/blob/0c6cb5285bc90b35dfdb476f47fe9bad721abf8b/nptl/allocatestack.c#L191
[4]
https://github.com/bminor/glibc/blob/0c6cb5285bc90b35dfdb476f47fe9bad721abf8b/nptl/allocatestack.c#L558
[5]
https://github.com/bminor/glibc/blob/0c6cb5285bc90b35dfdb476f47fe9bad721abf8b/nptl/allocatestack.c#L483
[6]
https://github.com/bminor/glibc/blob/0c6cb5285bc90b35dfdb476f47fe9bad721abf8b/nptl/allocatestack.c#L256
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