[mapserver-dev] Fwd: mapserver deadlock on signal

[Stephan Holl]

Hello Lauri,

Lauri <lauri.nomme at gmail.com>, [20120104 - 11:11:32]

> 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.

Seems merged now to trunk from tbonfort; thanks to Lauri for creating
the patch an tbonfort for applying.

Any chance to port it back
to 6.0.x-branch (if there will be still another 6.0.x-release before
6.1)?

Best
	
	Stephan

> 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 ()
> >> called> 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 Geschäftsführer:  Frank Koormann, Bernhard Reiter, Dr.
> > Jan-Oliver Wagner
> >
> > _______________________________________________
> > mapserver-dev mailing list
> > mapserver-dev at lists.osgeo.org
> > http://lists.osgeo.org/mailman/listinfo/mapserver-dev
> >



-- 
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
Geschäftsführer:  Frank Koormann, Bernhard Reiter, Dr. Jan-Oliver Wagner
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