Date: Mon, 6 Nov 2000 14:46:43 +0200 (IST) From: Roman Shterenzon <roman@harmonic.co.il> To: Ekaterina Ivannikova <kate@gutatelecom.ru> Cc: freebsd-stable@FreeBSD.ORG Subject: Re: Possible problem in threads lib in -STABLE ? Message-ID: <Pine.LNX.4.10.10011061445051.24920-100000@shark.harmonic.co.il> In-Reply-To: <20001103183733.A3580@hub.all.yans.ru>
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On Fri, 3 Nov 2000, Ekaterina Ivannikova wrote: > Hi All, > > This is my third attempt at getting help, after trying freebsd-bugs and > freebsd-hackers mailing lists. Folks, please, do have a look. > > I was pursuing a strange bug which causes mysqld to hang (that is not to > accept any new connections) on FreeBSD 4.1 after working for some time > properly and MySQL folks suggested that there may be some pecularity in > FreeBSD threads library. I cvsup'ed FreeBSD on Nov 2 (after the code freeze > I presume). The problem persists. > Just tell me, is it normal that an app should be stuck in _thread_sys_poll > when clients are trying to connect to it ? > Please bear with me as I know nothing of threads programming :(. You can try this: http://people.freebsd.org/~deischen/libc_r.diffs-stable Please contact Daniel Eischen <eischen@vigrid.com> about this issue. pthreads were quite broken for our needs before this (huge) patch. With this patch everything _we_ tried worked fine. Too bad it won't make it into 4.2-RELEASE > > # uname -a: > > FreeBSD hub.all.yans.ru 4.2-BETA FreeBSD 4.2-BETA #0: Fri Nov 3 14:15:01 MSK 2000 root@hub.all.yans.ru:/usr/src/sys/compile/HUB i386 > > # ldd mysqld: > > /usr/local/mysql/libexec/mysqld: > libc_r.so.4 => /usr/lib/libc_r.so.4 (0x281cb000) > libm.so.2 => /usr/lib/libm.so.2 (0x2827a000) > libz.so.2 => /usr/lib/libz.so.2 (0x28295000) > libcrypt.so.2 => /usr/lib/libcrypt.so.2 (0x282a2000) > > # gdb mysqld 41672 > GNU gdb 4.18 > Copyright 1998 Free Software Foundation, Inc. > GDB is free software, covered by the GNU General Public License, and you are > welcome to change it and/or distribute copies of it under certain conditions. > Type "show copying" to see the conditions. > There is absolutely no warranty for GDB. Type "show warranty" for details. > This GDB was configured as "i386-unknown-freebsd"... > > /root/mysql-3.23.27-beta/sql/41672: No such file or directory. > Attaching to program: /root/mysql-3.23.27-beta/sql/mysqld, process 41672 > Reading symbols from /usr/lib/libc_r.so.4...done. > Reading symbols from /usr/lib/libm.so.2...done. > Reading symbols from /usr/lib/libz.so.2...done. > Reading symbols from /usr/lib/libcrypt.so.2...done. > Reading symbols from /usr/libexec/ld-elf.so.1...done. > 0x2821f000 in _thread_sys_poll () from /usr/lib/libc_r.so.4 > (gdb) info threads > 3 process 41672, thread 3 0x2821cdc2 in _thread_kern_sched () > from /usr/lib/libc_r.so.4 > 2 process 41672, thread 2 0x2821cdc2 in _thread_kern_sched () > from /usr/lib/libc_r.so.4 > * 1 process 41672, thread 1 0x2821f000 in _thread_sys_poll () > from /usr/lib/libc_r.so.4 > (gdb) thread 1 > [Switching to thread 1 (process 41672, thread 1)] > #0 0x2821f000 in _thread_sys_poll () from /usr/lib/libc_r.so.4 > (gdb) bt > #0 0x2821f000 in _thread_sys_poll () from /usr/lib/libc_r.so.4 > #1 0x2821dec7 in _thread_kern_sched_state_unlock () from /usr/lib/libc_r.so.4 > #2 0x2821d5b2 in _thread_kern_sched () from /usr/lib/libc_r.so.4 > #3 0x2821d9d6 in _thread_kern_sched_state () from /usr/lib/libc_r.so.4 > #4 0x281e15df in sigwait () from /usr/lib/libc_r.so.4 > #5 0x807a3dc in signal_hand (arg=0x0) at mysqld.cc:1162 > #6 0x281e3a7f in _thread_start () from /usr/lib/libc_r.so.4 > #7 0x0 in ?? () > (gdb) thread 2 > [Switching to thread 2 (process 41672, thread 2)] > #0 0x2821cdc2 in _thread_kern_sched () from /usr/lib/libc_r.so.4 > (gdb) bt > #0 0x2821cdc2 in _thread_kern_sched () from /usr/lib/libc_r.so.4 > #1 0x2821da47 in _thread_kern_sched_state_unlock () from /usr/lib/libc_r.so.4 > #2 0x2821b9ee in pthread_mutex_lock () from /usr/lib/libc_r.so.4 > #3 0x2821bcf8 in _mutex_cv_lock () from /usr/lib/libc_r.so.4 > #4 0x28222fe8 in pthread_cond_timedwait () from /usr/lib/libc_r.so.4 > #5 0x2820bac9 in _thread_gc () from /usr/lib/libc_r.so.4 > #6 0x281e3a7f in _thread_start () from /usr/lib/libc_r.so.4 > #7 0x0 in ?? () > (gdb) thread 3 > [Switching to thread 3 (process 41672, thread 3)] > #0 0x2821cdc2 in _thread_kern_sched () from /usr/lib/libc_r.so.4 > (gdb) bt > #0 0x2821cdc2 in _thread_kern_sched () from /usr/lib/libc_r.so.4 > #1 0x2821d9d6 in _thread_kern_sched_state () from /usr/lib/libc_r.so.4 > #2 0x281e15df in sigwait () from /usr/lib/libc_r.so.4 > #3 0x807a3dc in signal_hand (arg=0x0) at mysqld.cc:1162 > #4 0x281e3a7f in _thread_start () from /usr/lib/libc_r.so.4 > #5 0x0 in ?? () > (gdb) > > Any advice is very much appreciated. > > > Ekaterina Ivannikova > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-stable" in the body of the message > --Roman Shterenzon, UNIX System Administrator and Consultant [ Xpert UNIX Systems Ltd., Herzlia, Israel. Tel: +972-9-9522361 ] To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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