Date: 09 May 2003 20:16:28 -0400 From: Joe Marcus Clarke <marcus@marcuscom.com> To: current@freebsd.org Subject: Bug on libc_r? Message-ID: <1052525788.89237.8.camel@shumai.marcuscom.com>
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Users testing the GNOME 2.3.x snapshots recently ran into a strange
crash in Nautilus. I updated my own -CURRENT machine, and found the
problem is quite reproduceable. I'm still trying to track down why this
suddenly started happening, but it looks like there might be a bug in
libc_r on -CURRENT. This problem is not seen on -STABLE with the same
version of Nautilus and dependent libraries.
The version of -CURRENT in question is:
FreeBSD jclarke-pc.cisco.com 5.1-BETA FreeBSD 5.1-BETA #15: Thu May 8
12:45:49 EDT 2003 =20
marcus@jclarke-pc.cisco.com:/usr/obj/usr/src/sys/JCLARKE-PC i386
The stack trace with thread locking debugging enabled is:
Program received signal SIGSEGV, Segmentation fault.
_atomic_lock () at {standard input}:15
15 {standard input}: No such file or directory.
in {standard input}
Current language: auto; currently asm
#0 _atomic_lock () at {standard input}:15
#1 0x28de9f44 in _spinlock_debug (lck=3D0x28a15678,
fname=3D0x1 <Error reading address 0x1: Bad address>,
lineno=3D-1078989016)
at /usr/src/lib/libc_r/uthread/uthread_spinlock.c:110
#2 0x28defbf4 in mutex_unlock_common (mutex=3D0x28a15678,
add_reference=3D1)
at /usr/src/lib/libc_r/uthread/uthread_mutex.c:851
#3 0x28defa89 in _mutex_cv_unlock (mutex=3D0x1)
at /usr/src/lib/libc_r/uthread/uthread_mutex.c:756
#4 0x28df4ae1 in _pthread_cond_wait (cond=3D0x28a15678, mutex=3D0x28a15678=
)
at /usr/src/lib/libc_r/uthread/uthread_cond.c:254
#5 0x28df4c4e in __pthread_cond_wait (cond=3D0x1, mutex=3D0x1)
at /usr/src/lib/libc_r/uthread/uthread_cond.c:343
#6 0x28d46595 in pthread_cond_wait () from /usr/lib/libc.so.5
#7 0x28a05a98 in gnome_vfs_thread_pool_wait_for_work (state=3D0x8400560)
at gnome-vfs-thread-pool.c:152
#8 0x28a05af3 in thread_entry (cast_to_state=3D0x8400560)
at gnome-vfs-thread-pool.c:172
#9 0x28b0acb2 in g_thread_create_proxy ()
from /usr/local/lib/libglib-2.0.so.200
#10 0x28de848e in _thread_start ()
at /usr/src/lib/libc_r/uthread/uthread_create.c:275
With thread locking debugging disabled, I get:
Program received signal SIGSEGV, Segmentation fault.
_atomic_lock () at {standard input}:15
15 {standard input}: No such file or directory.
in {standard input}
Current language: auto; currently asm
(gdb) bt
#0 _atomic_lock () at {standard input}:15
#1 0x28de9ba9 in _spinlock (lck=3D0x3957c)
at /usr/src/lib/libc_r/uthread/uthread_spinlock.c:71
#2 0x28def742 in mutex_unlock_common (mutex=3D0x28a15678,
add_reference=3D1)
at /usr/src/lib/libc_r/uthread/uthread_mutex.c:851
#3 0x28def5e9 in _mutex_cv_unlock (mutex=3D0x1)
at /usr/src/lib/libc_r/uthread/uthread_mutex.c:756
#4 0x28df430f in _pthread_cond_wait (cond=3D0x28a15678, mutex=3D0x28a15678=
)
at /usr/src/lib/libc_r/uthread/uthread_cond.c:254
#5 0x28df446e in __pthread_cond_wait (cond=3D0x1, mutex=3D0x1)
at /usr/src/lib/libc_r/uthread/uthread_cond.c:343
#6 0x28d46595 in pthread_cond_wait () from /usr/lib/libc.so.5
#7 0x28a05a98 in gnome_vfs_thread_pool_wait_for_work (state=3D0x8400560)
at gnome-vfs-thread-pool.c:152
#8 0x28a05af3 in thread_entry (cast_to_state=3D0x8400560)
at gnome-vfs-thread-pool.c:172
#9 0x28b0acb2 in g_thread_create_proxy ()
from /usr/local/lib/libglib-2.0.so.200
#10 0x28de82fe in _thread_start ()
at /usr/src/lib/libc_r/uthread/uthread_create.c:275
(gdb) frame 1
#1 0x28de9ba9 in _spinlock (lck=3D0x3957c)
at /usr/src/lib/libc_r/uthread/uthread_spinlock.c:71
71 _thread_kern_sched_state(PS_SPINBLOCK, __FILE__,
__LINE__);
Current language: auto; currently c
(gdb) print lck
$1 =3D (struct {...} *) 0x3957c
(gdb) print *lck
Error accessing memory address 0x3957c: Bad address.
Any idea if this is something in the GNOME stuff or in libc_r itself?=20
Thanks.
Joe
--=20
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