[Bug nptl/28612] New: pthread_exit breaks signal mask at thread termination.

[Bug nptl/28612] New: pthread_exit breaks signal mask at thread termination.

[fryasu at yahoo dot co.jp]

https://sourceware.org/bugzilla/show_bug.cgi?id=28612

            Bug ID: 28612
           Summary: pthread_exit breaks signal mask at thread termination.
           Product: glibc
           Version: 2.34
            Status: UNCONFIRMED
          Severity: minor
          Priority: P2
         Component: nptl
          Assignee: unassigned at sourceware dot org
          Reporter: fryasu at yahoo dot co.jp
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

Created attachment 13801
  --> https://sourceware.org/bugzilla/attachment.cgi?id=13801&action=edit
Test code for reproduction

pthread_exit() breaks the signal mask in glibc of Fedora 35
(glibc-2.34-8.fc35).

The signal might be catch at termination of thread even when signal mask is
set.

This behavior is reproduced with attached test code:

    $ gcc -O2 pthread_sigblock_test.c -o a.out -pthread && ./a.out
       :
    NG, signal was caught

At least in CentOS 7 (glibc 2.17), it works as expected.

Parhaps, the below change is caused this behavior.

  - [RFC PATCH glibc 3/8] nptl: Start new threads with all signals blocked [BZ
#25098]
    https://sourceware.org/pipermail/libc-alpha/2020-March/112035.html

'__libc_signal_restore_set(&pd->sigmask)' seems be called at also end of thread
in the case of pthread_exit() called.

When use no pthread_exit(), signal mask is kept at termination of thread as
expected.

    $ gcc -DWITHOUT_PTHREAD_EXIT -O2 pthread_sigblock_test.c -o a.out -pthread
&& ./a.out
       :
    OK, signal was blocked

I'm sorry if I misunderstood the code.

Best regards,

-- 
You are receiving this mail because:
You are on the CC list for the bug.

[Bug nptl/28612] pthread_exit breaks signal mask at thread termination.

[schwab@linux-m68k.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=28612

Andreas Schwab <schwab@linux-m68k.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |DUPLICATE

--- Comment #1 from Andreas Schwab <schwab@linux-m68k.org> ---
dup

*** This bug has been marked as a duplicate of bug 28607 ***

-- 
You are receiving this mail because:
You are on the CC list for the bug.

[Bug nptl/28612] pthread_exit breaks signal mask at thread termination.

[fryasu at yahoo dot co.jp]

https://sourceware.org/bugzilla/show_bug.cgi?id=28612

--- Comment #2 from fryasu at yahoo dot co.jp ---
Thanks for replying.

And sorry that my confirmation was not enough.

But I'm glad to know this issue will be resolved because I was in this problem.

-- 
You are receiving this mail because:
You are on the CC list for the bug.