Date: Wed, 30 Jul 2003 16:48:57 -0400 (EDT) From: John Baldwin <jhb@FreeBSD.org> To: Kris Kennaway <kris@obsecurity.org> Cc: current@FreeBSD.org Subject: RE: panic: sleeping thread owns a mutex Message-ID: <XFMail.20030730164857.jhb@FreeBSD.org> In-Reply-To: <20030728104725.GA52281@rot13.obsecurity.org>
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On 28-Jul-2003 Kris Kennaway wrote: > One of the alpha package machines just died with the following: > > panic: sleeping thread owns a mutex > panic() at panic+0x160 > propagate_priority() at propagate_priority+0x148 > _mtx_lock_sleep() at _mtx_lock_sleep+0x264 > _mtx_lock_flags() at _mtx_lock_flags+0x84 > _vm_map_lock() at _vm_map_lock+0x40 > vm_map_remove() at vm_map_remove+0x34 > kmem_free() at kmem_free+0x34 > pipe_free_kmem() at pipe_free_kmem+0xbc > pipeclose() at pipeclose+0x188 > pipe_close() at pipe_close+0x40 > fdrop_locked() at fdrop_locked+0x180 > fdrop() at fdrop+0x50 > closef() at closef+0x260 > fdfree() at fdfree+0x3c4 > exit1() at exit1+0x578 > sys_exit() at sys_exit+0x58 > syscall() at syscall+0x338 > XentSys() at XentSys+0x64 > --- syscall (1, FreeBSD ELF64, sys_exit) --- > --- user mode --- > db> > > (gdb -k is still broken on alpha, so I can't do better). The machine > is running a kernel from June 20. The only way to track these down is to use witness. By the time we get here it becomes a lot harder to track down. It does look to be alc@'s fault since it is a vm_map mutex however. To get better info, you are going to need to do the following in ddb when it panics: - Examine the mutex structure to find the lock owner, then examine the thread structure to find the proc pointer, and finally, examine the proc structure to find the pid. - or - - Change the panic message to print the PID. I just committed this. Then: - trace <pid> to see where it slept -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/
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