[mapserver-dev] Fwd: mapserver deadlock on signal

[Lauri]

Hello.

The issue is here
http://trac.osgeo.org/mapserver/ticket/4093#comment:4 but there is no
progress.
I'd appreciate it being merged aswell.

Lauri

On Tue, Jan 3, 2012 at 5:17 PM, Stephan Holl <stephan.holl at intevation.de> wrote:
> Hello Devs,
>
> Lauri <lauri.nomme at gmail.com>, [20111108 - 15:35:51]
>
>> Hi
>>
>> There is a bug in how mapserver handles USR1 and TERM signals when
>> used in fastcgi mode.
>> msCleanupOnSignal calls msCleanup, which calls gdFontCacheShutdown
>> which tries to acquire a mutex that can already be locked, deadlocking
>> the process.
>
> We are forcing this issue withlibapache2-mod-fcgid  and
> MapServer 6.0.1. Is there an issue for this patch in trac or is this
> already solved in trunk?
>
> Best
>
>        Stephan
>
>
>> A sample stack trace showing the symptoms:
>> Process 12533 attached - interrupt to quit
>> futex(0x7ffdcb1b7d80, FUTEX_WAIT_PRIVATE, 2, NULL
>>
>> (gdb) bt
>> #0  0x00007fdf9ec99be4 in __lll_lock_wait () from /lib/libpthread.so.0
>> #1  0x00007fdf9ec950e9 in _L_lock_953 () from /lib/libpthread.so.0
>> #2  0x00007fdf9ec94f0b in pthread_mutex_lock ()
>> from /lib/libpthread.so.0 #3  0x00007fdfa19edf1a in
>> gdFontCacheShutdown () from /usr/lib/libgd.so.2 #4
>>  0x000000000047e890 in msCleanup () #5  0x000000000044b4d0 in
>> msCleanupOnSignal () #6  <signal handler called>
>> #7  0x00007fdfa154b538 in TT_RunIns () from /usr/lib/libfreetype.so.6
>> #8  0x00007fdfa1546073 in ?? () from /usr/lib/libfreetype.so.6
>> #9  0x00007fdfa154edc1 in ?? () from /usr/lib/libfreetype.so.6
>> #10 0x00007fdfa154f47d in ?? () from /usr/lib/libfreetype.so.6
>> #11 0x00007fdfa153b4aa in FT_Load_Glyph ()
>> from /usr/lib/libfreetype.so.6 #12 0x00007fdfa19eccb3 in
>> gdImageStringFTEx () from /usr/lib/libgd.so.2 #13 0x00007fdfa19ed89b
>> in gdImageStringFT () from /usr/lib/libgd.so.2 #14 0x00000000004cd151
>> in msDrawTextLineGD () #15 0x000000000057de7e in msDrawTextLine ()
>> #16 0x00000000004b8286 in msDrawLabelCache ()
>> #17 0x00000000004ad595 in msDrawMap ()
>> #18 0x00000000005a6aea in msWMSGetMap ()
>> #19 0x00000000005aa52d in msWMSDispatch ()
>> #20 0x000000000050ce91 in msOWSDispatch ()
>> #21 0x000000000044b8b8 in main ()
>>
>> Patch for this problem is attached.
>>
>> Lauri Nõmme
>
>
>
> --
> Stephan Holl <stephan.holl at intevation.de> | Tel.: +49 (0)541-33 508 3663
> Intevation GmbH, Neuer Graben 17, 49074 OS  |  AG Osnabrück - HR B 18998
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>
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