[Bug libc/20375] New: posix_spawn fails when full signal set passed to posix_spawnattr_setsigdefault and POSIX_SPAWN_SETSIGDEF is set

[kb9vqf at pearsoncomputing dot net]

https://sourceware.org/bugzilla/show_bug.cgi?id=20375

            Bug ID: 20375
           Summary: posix_spawn fails when full signal set passed to
                    posix_spawnattr_setsigdefault and
                    POSIX_SPAWN_SETSIGDEF is set
           Product: glibc
           Version: 2.23
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: kb9vqf at pearsoncomputing dot net
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

Created attachment 9392
  --> https://sourceware.org/bugzilla/attachment.cgi?id=9392&action=edit
Test program showing the problem

Processes launched via posix_spawn immediately fail with exit code 127 if both
of the following conditions are met:
1.) A full signal set is passed to posix_spawnattr_setsigdefault
2.) The POSIX_SPAWN_SETSIGDEF flag is set

I have attached a test program showing the problem.  Commenting out the
POSIX_SPAWN_SETSIGDEF line results in the expected "ls" output.

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