[Bug dynamic-link/26728] New: Change _dl_fatal_printf to dump core file

[Bug dynamic-link/26728] New: Change _dl_fatal_printf to dump core file

[jg at jguk dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=26728

            Bug ID: 26728
           Summary: Change _dl_fatal_printf to dump core file
           Product: glibc
           Version: 2.34
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: dynamic-link
          Assignee: unassigned at sourceware dot org
          Reporter: jg at jguk dot org
  Target Milestone: ---

Could _dl_fatal_printf be considered to change to call raise a signal that
dumps the core instead of _exit(127)?

As the code is an assert(), perhaps SIGTRAP or SIGABRT is best?

On my computer any C program compiled with assert(0) dumps a core file, but
this glibc issue assert does not dump a core file.

Inconsistency detected by ld.so: ../elf/dl-tls.c: 481: _dl_allocate_tls_init:
Assertion `listp->slotinfo[cnt].gen <= GL(dl_tls_generation)' failed!
Command exited with non-zero status 127

This came up while discussing this issue
https://sourceware.org/bugzilla/show_bug.cgi?id=19329


This is my test program

$ ./a
a: a.c:6: main: Assertion `0' failed.
Aborted (core dumped)


$ cat a.c
// gcc -Wall -o a a.c
#include <assert.h>

int main()
{
    assert(0);
}

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[Bug dynamic-link/26728] Change _dl_fatal_printf to dump core file

[schwab@linux-m68k.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=26728

--- Comment #1 from Andreas Schwab <schwab@linux-m68k.org> ---
_dl_fatal_printf is not only used for assertions.

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[Bug dynamic-link/26728] Change _dl_fatal_printf to dump core file

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=26728

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |fweimer at redhat dot com

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[Bug dynamic-link/26728] Change _dl_fatal_printf to dump core file

[jg at jguk dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=26728

--- Comment #2 from Jonny Grant <jg at jguk dot org> ---
(In reply to Andreas Schwab from comment #1)
> _dl_fatal_printf is not only used for assertions.

Maybe a new _dl_fatal_printf_abort could be added for the assertion use case.

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