[Bug stdio/31963] New: Crash in _IO_link_in within __gcov_exit

[Bug stdio/31963] New: Crash in _IO_link_in within __gcov_exit

[schwab@linux-m68k.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=31963

            Bug ID: 31963
           Summary: Crash in _IO_link_in within __gcov_exit
           Product: glibc
           Version: 2.40
            Status: NEW
          Severity: normal
          Priority: P2
         Component: stdio
          Assignee: unassigned at sourceware dot org
          Reporter: schwab@linux-m68k.org
  Target Milestone: ---

m4 crashes during exit when compiled with -fprofile-generate.  m4 closes all
standard streams in an atexit handler (close_stdin from gnulib) which results
in _IO_list_all == NULL.  The gcov destructor function then opens a file to
write out the profiling data which crashes here:

122               _IO_list_all->file._prevchain = &fp->file._chain;

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[Bug stdio/31963] Crash in _IO_link_in within __gcov_exit

[schwab@linux-m68k.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=31963

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Blocks|                            |27777


Referenced Bugs:

https://sourceware.org/bugzilla/show_bug.cgi?id=27777
[Bug 27777] fclose does a linear search, takes ages when many FILE* are opened
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[Bug stdio/31963] Crash in _IO_link_in within __gcov_exit

[schwab@linux-m68k.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=31963

--- Comment #1 from Andreas Schwab <schwab@linux-m68k.org> ---
#include <stdio.h>

static void close_stdin (void)
{
  fclose (stdin);
  fclose (stdout);
  fclose (stderr);
}

static void final (void)
{
  FILE *f = fopen ("/dev/null", "w");
  fprintf (f, "final\n");
  fclose (f);
}

int main (void)
{
  close_stdin ();
  final ();
}

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[Bug stdio/31963] Crash in _IO_link_in within __gcov_exit

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=31963

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |2.40
           Assignee|unassigned at sourceware dot org   |hjl.tools at gmail dot com

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[Bug stdio/31963] Crash in _IO_link_in within __gcov_exit

[sam at gentoo dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=31963

--- Comment #2 from Sam James <sam at gentoo dot org> ---
There's two semantically equivalent patches:
* https://inbox.sourceware.org/libc-alpha/mvmwmlwgf66.fsf@suse.de/T/#u
*
https://inbox.sourceware.org/libc-alpha/20240708220201.3252178-1-hjl.tools@gmail.com/

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[Bug stdio/31963] Crash in _IO_link_in within __gcov_exit

[schwab@linux-m68k.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=31963

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|NEW                         |RESOLVED

--- Comment #3 from Andreas Schwab <schwab@linux-m68k.org> ---
Fixed in commit 2213b37b70.

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