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From: "aj at suse dot de" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sources.redhat.com
Subject: [Bug libc/13580] New: crash in glibc with dlopen and math functions
Date: Tue, 10 Jan 2012 09:49:00 -0000
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http://sourceware.org/bugzilla/show_bug.cgi?id=13580

             Bug #: 13580
           Summary: crash in glibc with dlopen and math functions
           Product: glibc
           Version: 2.15
            Status: NEW
          Severity: critical
          Priority: P2
         Component: libc
        AssignedTo: drepper.fsp@gmail.com
        ReportedBy: aj@suse.de
    Classification: Unclassified


Both Arch Linux and openSUSE have received bug reports where a program (apache,
subversion or gdk-pixbuf-query-loaders) crashes in glibc after dlopening a
shared library that needs libm.

https://bugs.archlinux.org/task/27736 
https://bugzilla.novell.com/show_bug.cgi?id=740109

backtrace is:
#0  0x0000000000005446 in ?? ()
#1  0x00007ffff513b095 in floor () from /lib64/libm.so.6
#2  0x00007ffff7de7f7c in _dl_relocate_object ()
   from /lib64/ld-linux-x86-64.so.2
#3  0x00007ffff7dee3e6 in dl_open_worker () from /lib64/ld-linux-x86-64.so.2
#4  0x00007ffff7dea146 in _dl_catch_error () from /lib64/ld-linux-x86-64.so.2
#5  0x00007ffff7dedd2a in _dl_open () from /lib64/ld-linux-x86-64.so.2
#6  0x00007ffff711cf26 in dlopen_doit () from /lib64/libdl.so.2
#7  0x00007ffff7dea146 in _dl_catch_error () from /lib64/ld-linux-x86-64.so.2
#8  0x00007ffff711d4cf in _dlerror_run () from /lib64/libdl.so.2
#9  0x00007ffff711cfc1 in dlopen@@GLIBC_2.2.5 () from /lib64/libdl.so.2

Disabling the floor multiarch ifuncs for x86-64 fixes this. This is
reproduceable for some users but I could not reproduce it yet on my own system.

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