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Date: Sat, 11 Aug 2007 15:18:35 -0400
From: Kris Kennaway <kris@obsecurity.org>
To: Rong-en Fan <grafan@gmail.com>
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Cc: current@freebsd.org
Subject: Re: panic: sleeping thread owns a non-sleepable lock
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On Sun, Aug 12, 2007 at 02:22:35AM +0800, Rong-en Fan wrote:
> I'm running 7.0-CURRENT as of  yesterday, and it's very easy
> to make it panic:
> 
> Sleeping thread (tid 100065, pid 1066) owns a non-sleepable lock
> sched_switch(c50a1600,0,1,1c7a7e4,4217e5,...) at sched_switch+0x190
> mi_switch(1,0) at mi_switch+0x13f
> sleepq_switch(c50a1600,0,c078a4e2,21b,c07e3820,...) at sleepq_switch+0x87
> sleepq_wait(c07e3820,0,c0770b7e,3,0,...) at sleepq_wait+0x36
> _sx_xlock_hard(c07e3820,c50a1600,0,0,0,...) at _sx_xlock_hard+0x21d
> fr_checknatout(f9c7a8d0,f9c7a8cc,64,c57ad900,c4de7400,...) at
> fr_checknatout+0x29d
> fr_check(c8cc4644,14,c4de7400,1,f9c7a9b4,...) at fr_check+0x9b1
> fr_check_wrapper(0,f9c7a9b4,c4de7400,2,c54dab28,...) at fr_check_wrapper+0x3f
> pfil_run_hooks(c08057c0,f9c7aa4c,c4de7400,2,c54dab28,...) at pfil_run_hooks+0x74
> ip_output(c8cc4600,0,f9c7aa10,0,0,...) at ip_output+0x913
> tcp_output(cae322d0,cb277200,0,0,0,...) at tcp_output+0x1106
> tcp_usr_send(c51e7318,0,cb277200,0,0,...) at tcp_usr_send+0x240
> kern_sendfile(c50a1600,f9c7acfc,0,0,0,...) at kern_sendfile+0x1037
> sendfile(c50a1600,f9c7acfc,20,16,f9c7ad2c,...) at sendfile+0xa8
> syscall(f9c7ad38) at syscall+0x315
> Xint0x80_syscall() at Xint0x80_syscall+0x20
> --- syscall (393, FreeBSD ELF32, sendfile), eip = 0x28290bff, esp =
> 0xbfbfc6ac, ebp = 0xbfbfe718 ---

What is the lock it holds, and where is it acquired?

kris