[Bug nptl/34378] New: pthread_create should not return ENOMEM as EAGAIN

https://sourceware.org/bugzilla/show_bug.cgi?id=34378

            Bug ID: 34378
           Summary: pthread_create should not return ENOMEM as EAGAIN
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: nptl
          Assignee: unassigned at sourceware dot org
          Reporter: fweimer at redhat dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

The EAGAIN failure can be spurious due to kernel task accounting bugs. (Futex
wake due to thread exit happens before all thread resources are deallocated.)
Some applications have retry loops around pthread_create, immediately retrying
again after pthread_create returns fails with EAGAIN, to work around these
kernel bugs. POSIX says we need to report memory allocation failures as EAGAIN,
not just thread-related resource shortages, so applications retry for what is
technically an ENOMEM error because they see it as an EAGAIN error. This is
wasteful.

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