[Bug libc/13699] New: Hang in __lll_lock_wait_private after fork and realloc.

["gf at unixsol dot org" <sourceware-bugzilla@sourceware.org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=13699

             Bug #: 13699
           Summary: Hang in __lll_lock_wait_private after fork and
                    realloc.
           Product: glibc
           Version: 2.13
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper.fsp@gmail.com
        ReportedBy: gf@unixsol.org
    Classification: Unclassified


I'm using glibc 2.13 from Slackware 13.37 on x86-64. One of our local programs
hangs from time to time and I have kill -9 it. Today I was able to get core
file and get the following back trace.

#0  0x00007f3118abfa8e in __lll_lock_wait_private () from /lib64/libc.so.6
#1  0x00007f3118a49c75 in _L_lock_12271 () from /lib64/libc.so.6
#2  0x00007f3118a47efd in realloc () from /lib64/libc.so.6
#3  0x00007f3118a3b633 in vasprintf () from /lib64/libc.so.6
#4  0x00007f3118a1c238 in asprintf () from /lib64/libc.so.6
#5  0x00007f31189f7863 in __assert_fail () from /lib64/libc.so.6
#6  0x00007f3118d76366 in __reclaim_stacks () from /lib64/libpthread.so.0
#7  0x00007f3118a78a36 in fork () from /lib64/libc.so.6
#8  0x000000000040672d in do_notify (in=<value optimized out>) at
lib/inotify.c:39
#9  0x00007f3118d76d6b in start_thread () from /lib64/libpthread.so.0
#10 0x00007f3118ab045d in clone () from /lib64/libc.so.6

The program uses about 4G memory on machine with 16G and and 2.6.38.7 kernel.

The notify function looks like this:
https://github.com/gfto/tsdecrypt/blob/master/notify.c#L46

I understand the problem is some kind of malloc related deadlock but I have no
idea how to avoid or work around it. There is currently glibc 2.14.1 in
slackware-current, will updating to this version fix the problem?

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