Date: Thu, 29 Apr 2004 17:49:49 +0200 From: Michael Bretterklieber <mbretter@a-quadrat.at> To: current@FreeBSD.org Subject: libthr, libpthread problems Message-ID: <4091241D.7020501@a-quadrat.at>
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Hi,
currently I'm testing Mpd-4 on -current and It ran into deadlock,
therefore I changed the lib mapping via libmap.conf. When using libc_r
everything is ok, when using libpthread a deadlock occurs under some
circumstances, when using libthr, then:
elvis:/home/mbretter/mpd/src# ./mpd
Multi-link PPP for FreeBSD, by Archie L. Cobbs.
Based on iij-ppp, by Toshiharu OHNO.
The mutex recurse count cannot be less than zero
Abnormal termination, file: /usr/src/lib/libthr/thread/thr_mutex.c,
line: 677
Abort trap (core dumped)
#0 0x282dd48b in thr_kill () from /lib/libc.so.5
(gdb) bt
#0 0x282dd48b in thr_kill () from /lib/libc.so.5
#1 0x28287e9f in _pthread_kill (pthread=0x808e000, sig=6)
at /usr/src/lib/libthr/thread/thr_sig.c:94
#2 0x28287aab in _raise (sig=6)
at /usr/src/lib/libthr/thread/thr_syscalls.c:282
#3 0x2833ff4f in abort () from /lib/libc.so.5
#4 0x2828a9bf in mutex_unlock_common (mutex=0x281460b0, add_reference=0)
at /usr/src/lib/libthr/thread/thr_mutex.c:712
#5 0x2828a664 in __pthread_mutex_unlock (mutex=0x281460b0)
at /usr/src/lib/libthr/thread/thr_mutex.c:587
#6 0x28127251 in typed_mem_realloc () from /usr/local/lib/libpdel.so.0
#7 0x281275b2 in typed_mem_strdup () from /usr/local/lib/libpdel.so.0
#8 0x28127672 in typed_mem_vasprintf () from /usr/local/lib/libpdel.so.0
#9 0x2812b4b1 in valog () from /usr/local/lib/libpdel.so.0
#10 0x0806b610 in vlogprintf (fmt=0x0, ap=0x0) at log.c:516
#11 0x0806af9e in LogPrintf (fmt=0x80824c0 "mpd: pid %lu, version %s")
at log.c:273
#12 0x0806ba56 in Greetings () at main.c:249
#13 0x0806b71a in main (ac=-1077941372, av=0xbfbfecf0) at main.c:159
#14 0x0804b23e in _start ()
any ideas, is this a bug in the application itself or libthr specific?
If I'm using libpthread, then it works, but sometimes Mpd gets
deadlocked (after terminating a thread and acquiring Mpd's internal
"giant mutex").
elvis:/home/mbretter/mpd/src# ps -p 7558 -H
PID TT STAT TIME COMMAND
7558 p0 SL 0:00.12 ./mpd
7558 p0 SL 0:00.12 ./mpd
7558 p0 SL 0:00.12 ./mpd
and state of the process is "kserel".
When Using libc_r everything works fine.
I also tried to attach gdb to the running process (when Mpd was
deadlocked), but this didn't worked, gdb als gets locked then.
The machine has installed a -current dated of yesterday, using a non-smp
kernel.
bye,
--
------------------------------- ----------------------------------
Michael Bretterklieber - http://www.bretterklieber.com
A-Quadrat Automation GmbH - http://www.a-quadrat.at
Tel: ++43-(0)3172-41679 - GSM: ++43-(0)699 12861847
------------------------------- ----------------------------------
"...the number of UNIX installations has grown to 10, with more
expected..." - Dennis Ritchie and Ken Thompson, June 1972
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