Date: Fri, 13 Jun 2003 22:49:11 -0700 (PDT) From: Nate Lawson <nate@root.org> To: current@freebsd.org Subject: LoR with buf system caused by pcm Message-ID: <20030613223701.D46185@root.org>
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Looks like my mp3 playback tried to acquire UFS lockmgr lock with the pcm lock held. Also, got a LoR w/ Giant through a page not present trap. Only the backtrace() is hand-transcribed due to it not being in dmesg. My system appears to be working fine and there was no crash. dmesg ----- pcm0: <Intel 82801CA (ICH3)> port 0x18c0-0x18ff,0x1c00-0x1cff irq 11 at device 31.5 on pci0 pcm0: <Cirrus Logic CS4299 AC97 Codec> Acquiring lockmgr lock "ufs" with the following non-sleepablelocks held: exclusive sleep mutex pcm0:play:0 (pcm channel) r = 0 (0xc37a8a00) locked @ /usr/src/sys/dev/sound/pcm/dsp.c:146 Sleeping on "spread" with the following non-sleepablelocks held: exclusive sleep mutex pcm0:play:0 (pcm channel) r = 0 (0xc37a8a00) locked @ /usr/src/sys/dev/sound/pcm/dsp.c:146 lock order reversal 1st 0xc37a8a00 pcm0:play:0 (pcm channel) @ /usr/src/sys/dev/sound/pcm/dsp.c:146 2nd 0xc039a0c0 Giant (Giant) @ kern/kern_synch.c:311 Stack backtrace: ...witness_lock _mtx_lock_flags()+0xb1 msleep()+0x6c4 bwait()+0x70 spec_getpages()+0x1d5 spec_vnoperate()+0x18 ffs_getpages()+0x4bc vnode_pager_getpages()+0x77 vm_fault()+0x8f3 trap_pfault()+0xef trap()+0x3ad calltrap()+0x5 --- trap 0xc generic_copyin()+0x32 sndbuf_uiomove()+0xe1 chn_write()+0x10f dsp_write()+0x85 spec_write()+0x190 ... write() syscall()
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