Date: Sat, 07 Feb 2004 21:56:09 +0800 From: David Xu <davidxu@freebsd.org> To: current@freebsd.org Subject: non-sleepable locks held Message-ID: <4024EE79.50901@freebsd.org>
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I got following messages on console: malloc() of "256" with the following non-sleepable locks held: exclusive sleep mutex pcm0 (sound cdev) r = 0 (0xc3800600) locked @ /usr/home/davidxu/src/sys/dev/sound/pcm/dsp.c:213 lock order reversal 1st 0xc3b85a38 filedesc structure (filedesc structure) @ kern/sys_generic.c:901 2nd 0xc0927ca0 Giant (Giant) @ fs/specfs/spec_vnops.c:377 Stack backtrace: backtrace(c086e5e9,c0927ca0,c086a64a,c086a64a,c0865c89) at backtrace+0x17 witness_checkorder(c0927ca0,9,c0865c89,179,1) at witness_checkorder+0x6f8 _mtx_lock_flags(c0927ca0,0,c0865c80,179,c086ec03) at _mtx_lock_flags+0x9d spec_poll(d7658afc,d7658b1c,c06aad6c,d7658afc,c0909e20) at spec_poll+0x134 spec_vnoperate(d7658afc,c0909e20,c390a30c,40,c3c37b00) at spec_vnoperate+0x18 vn_poll(c3ebbd8c,40,c4010180,c383b540,c4010180) at vn_poll+0x3c selscan(c383b540,d7658b9c,d7658b8c,9,4) at selscan+0x141 kern_select(c383b540,9,80692b0,80692c0,0) at kern_select+0x37f select(c383b540,d7658d14,14,438,5) at select+0x66 syscall(2f,2f,2f,3,0) at syscall+0x2a0 Xint0x80_syscall() at Xint0x80_syscall+0x1d --- syscall (93), eip = 0x282a28ab, esp = 0xbfbfe6cc, ebp = 0xbfbfe778 --- malloc() of "256" with the following non-sleepable locks held: exclusive sleep mutex pcm0 (sound cdev) r = 0 (0xc3800600) locked @ /usr/home/davidxu/src/sys/dev/sound/pcm/dsp.c:213 malloc() of "256" with the following non-sleepable locks held: exclusive sleep mutex pcm0 (sound cdev) r = 0 (0xc3800600) locked @ /usr/home/davidxu/src/sys/dev/sound/pcm/dsp.c:213
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