In message: <20100219031200.GY43625_at_cicely7.cicely.de> Bernd Walter <ticso_at_cicely7.cicely.de> writes: : On Thu, Feb 18, 2010 at 03:10:10PM +0200, Kostik Belousov wrote: : > On Thu, Feb 18, 2010 at 01:49:07PM +0100, Bernd Walter wrote: : > > On Tue, Feb 16, 2010 at 07:39:51PM +0100, Bernd Walter wrote: : > > > On Mon, Feb 15, 2010 at 10:39:07PM +0100, Bernd Walter wrote: : > > > [55]Please.tell.me.who.am.I# gdb /usr/sbin/named named.core : > > > GNU gdb 6.1.1 [FreeBSD] : > > > Copyright 2004 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 "arm-marcel-freebsd"...(no debugging symbols found)... : > > > Core was generated by `named'. : > > > Program terminated with signal 5, Trace/breakpoint trap. : > > > Reading symbols from /lib/libcrypto.so.6...(no debugging symbols found)...done. : > > > Loaded symbols for /lib/libcrypto.so.6 : > > > Reading symbols from /lib/libthr.so.3...(no debugging symbols found)...done. : > > > Loaded symbols for /lib/libthr.so.3 : > > > Reading symbols from /lib/libc.so.7...(no debugging symbols found)...done. : > > > Loaded symbols for /lib/libc.so.7 : > > > Reading symbols from /libexec/ld-elf.so.1...(no debugging symbols found)...done. : > > > Loaded symbols for /libexec/ld-elf.so.1 : > > > #0 0x203571b0 in _thread_bp_create () from /lib/libthr.so.3 : > > > [New Thread 20804280 (LWP 100062)] : > > > [New Thread 20804140 (LWP 100052)] : > > > (gdb) bt : > > > #0 0x203571b0 in _thread_bp_create () from /lib/libthr.so.3 : > > > #1 0x203572b8 in _thread_bp_death () from /lib/libthr.so.3 : > > > #2 0x20349da4 in pthread_create () from /lib/libthr.so.3 : > > > #3 0x00164cb8 in ?? () : > > > (gdb) : > > > : > > > Do we have a general threading problem on ARM? : > > : > > I see two different type a crashes. : > > Both have in common that one or more threads are in _umtx_op. : > > Unfortunately I don't know enough details about those things to isolate : > > any more. : > > : > > the one from above: : > > #0 0x203571b0 in _thread_bp_create () from /lib/libthr.so.3 : > > [New Thread 20804280 (LWP 100062)] : > > [New Thread 20804140 (LWP 100052)] : > > (gdb) bt : > > #0 0x203571b0 in _thread_bp_create () from /lib/libthr.so.3 : > > #1 0x203572b8 in _thread_bp_death () from /lib/libthr.so.3 : > > #2 0x20349da4 in pthread_create () from /lib/libthr.so.3 : > > #3 0x00164cb8 in ?? () : > > (gdb) thread 1 : > > [Switching to thread 1 (Thread 20804280 (LWP 100062))]#0 0x203ab6f0 in _umtx_op () from /lib/libc.so.7 : > > (gdb) bt : > > #0 0x203ab6f0 in _umtx_op () from /lib/libc.so.7 : > > #1 0x2035769c in pthread_cleanup_push () from /lib/libthr.so.3 : > > #2 0x20357cc0 in pthread_cleanup_push () from /lib/libthr.so.3 : > > #3 0x20349540 in pthread_getprio () from /lib/libthr.so.3 : > > #4 0x203499a0 in pthread_create () from /lib/libthr.so.3 : > > #5 0x00164cb8 in ?? () : > > : > > And another, which is what I get most of the time: : > > (gdb) thread 1 : > > [Switching to thread 1 (Thread 20804500 (LWP 100100))]#0 0x20435f28 in kevent () from /lib/libc.so.7 : > > (gdb) bt : > > #0 0x20435f28 in kevent () from /lib/libc.so.7 : > > #1 0x0014f2dc in ?? () : > > (gdb) thread 2 : > > [Switching to thread 2 (Thread 208043c0 (LWP 100099))]#0 0x203ab6f4 in _umtx_op () from /lib/libc.so.7 : > > (gdb) bt : > > #0 0x203ab6f4 in _umtx_op () from /lib/libc.so.7 : > > #1 0x2035769c in pthread_cleanup_push () from /lib/libthr.so.3 : > > #2 0x20357a78 in pthread_cleanup_push () from /lib/libthr.so.3 : > > #3 0x20355580 in pthread_cond_signal () from /lib/libthr.so.3 : > > #4 0x00000000 in ?? () : > > (gdb) thread 3 : > > [Switching to thread 3 (Thread 20804280 (LWP 100098))]#0 0x203ab6f4 in _umtx_op () from /lib/libc.so.7 : > > (gdb) bt : > > #0 0x203ab6f4 in _umtx_op () from /lib/libc.so.7 : > > #1 0x2035769c in pthread_cleanup_push () from /lib/libthr.so.3 : > > #2 0x20357a78 in pthread_cleanup_push () from /lib/libthr.so.3 : > > #3 0x20355580 in pthread_cond_signal () from /lib/libthr.so.3 : > > #4 0x2092d008 in ?? () : > > (gdb) thread 4 : > > [Switching to thread 4 (Thread 20804140 (LWP 100043))]#0 0x0015755c in ?? () : > > (gdb) bt : > > #0 0x0015755c in ?? () : > : > Compile and install ld-elf.so, libc and libthr with debugging symbols: : > (cd libexec/rtld-elf && make all install DEBUG_FLAGS=-g) : > (cd lib/libc && make all install DEBUG_FLAGS=-g) : > (cd lib/libthr && make all install DEBUG_FLAGS=-g) : > : > Then repeat the crash and try to see where in code does it happen. : : Currently I can only get this type. : I've started the unstripped named to get all the function names. : : (gdb) thread 1 : [Switching to thread 1 (Thread 20804500 (LWP 100100))]#0 0x20435308 in kevent () at kevent.S:3 : 3 RSYSCALL(kevent) : Current language: auto; currently asm : (gdb) bt : #0 0x20435308 in kevent () at kevent.S:3 : #1 0x0014f2dc in watcher () : #2 0x203495b0 in thread_start (curthread=0x20804500) at /data/builder/arm-current/head/lib/libthr/thread/thr_create.c:288 : #3 0x20349a20 in _pthread_create (thread=0x2046caa8, attr=0xbfffe7f8, start_routine=0x14f2ac <watcher>, arg=Variable "arg" is not available. : ) : at /data/builder/arm-current/head/lib/libthr/thread/thr_create.c:174 : #4 0x00000000 in ?? () : Cannot access memory at address 0x40 : (gdb) thread 2 : [Switching to thread 2 (Thread 208043c0 (LWP 100099))]#0 0x203ab558 in _umtx_op () at _umtx_op.S:3 : 3 RSYSCALL(_umtx_op) : (gdb) bt : #0 0x203ab558 in _umtx_op () at _umtx_op.S:3 : #1 0x2035753c in _umtx_op_err (obj=Variable "obj" is not available. : ) at /data/builder/arm-current/head/lib/libthr/thread/thr_umtx.c:36 : #2 0x20357910 in _thr_ucond_wait (cv=Variable "cv" is not available. : ) at /data/builder/arm-current/head/lib/libthr/thread/thr_umtx.c:182 : #3 0x20355464 in cond_wait_common (cond=Variable "cond" is not available. : ) at /data/builder/arm-current/head/lib/libthr/thread/thr_cond.c:204 : #4 0x20355600 in __pthread_cond_wait (cond=Variable "cond" is not available. : ) at /data/builder/arm-current/head/lib/libthr/thread/thr_cond.c:228 : #5 0x00153080 in run () : #6 0x203495b0 in thread_start (curthread=0x208043c0) at /data/builder/arm-current/head/lib/libthr/thread/thr_create.c:288 : #7 0x20349a20 in _pthread_create (thread=0x0, attr=0xbfffe8f8, start_routine=0x152d70 <run>, arg=Variable "arg" is not available. : ) : at /data/builder/arm-current/head/lib/libthr/thread/thr_create.c:174 : #8 0x2092b088 in ?? () : (gdb) thread 3 : [Switching to thread 3 (Thread 20804280 (LWP 100098))]#0 0x203ab558 in _umtx_op () at _umtx_op.S:3 : 3 RSYSCALL(_umtx_op) : (gdb) bt : #0 0x203ab558 in _umtx_op () at _umtx_op.S:3 : #1 0x2035753c in _umtx_op_err (obj=Variable "obj" is not available. : ) at /data/builder/arm-current/head/lib/libthr/thread/thr_umtx.c:36 : #2 0x20357910 in _thr_ucond_wait (cv=Variable "cv" is not available. : ) at /data/builder/arm-current/head/lib/libthr/thread/thr_umtx.c:182 : #3 0x20355464 in cond_wait_common (cond=Variable "cond" is not available. : ) at /data/builder/arm-current/head/lib/libthr/thread/thr_cond.c:204 : #4 0x20355600 in __pthread_cond_wait (cond=Variable "cond" is not available. : ) at /data/builder/arm-current/head/lib/libthr/thread/thr_cond.c:228 : #5 0x0016379c in run () : #6 0x203495b0 in thread_start (curthread=0x20804280) at /data/builder/arm-current/head/lib/libthr/thread/thr_create.c:288 : #7 0x20349a20 in _pthread_create (thread=0x0, attr=0xbfffe8f8, start_routine=0x163724 <run>, arg=Variable "arg" is not available. : ) : at /data/builder/arm-current/head/lib/libthr/thread/thr_create.c:174 : #8 0x2092b088 in ?? () : (gdb) thread 4 : [Switching to thread 4 (Thread 20804140 (LWP 100053))]#0 0x0015755c in isc_atomic_cmpxchg () : (gdb) bt : #0 0x0015755c in isc_atomic_cmpxchg () : #1 0x00157dac in isc_rwlock_lock () : #2 0x000f9790 in dns_db_register () : #3 0x0004d590 in dns_sdb_register () : #4 0x0000c974 in ns_builtin_init () : #5 0x0001aa90 in $a () : #6 0x0001aa90 in $a () : : isc_atomic_cmpxchg really sounds quite interesting though. : It is not only the crashing function it is also a type of function which : sounds error prune. ARM atomics require the help of the kernel to get right... WarnerReceived on Fri Feb 19 2010 - 02:26:23 UTC
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