Re: bind fails with sig11 on start / pthread failure on ARM?

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]
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> > 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.