Date: Sun, 12 Jun 2005 17:58:57 -0400 From: Suleiman Souhlal <ssouhlal@FreeBSD.org> To: Jun Kuriyama <kuriyama@imgsrc.co.jp> Cc: Current <freebsd-current@FreeBSD.org> Subject: Re: Acquiring lockmgr lock "ufs" with non-sleepable locks Message-ID: <C2C1A959-C36C-4A22-93E9-1744B20AC332@FreeBSD.org> In-Reply-To: <7mhdg4q983.wl%kuriyama@imgsrc.co.jp> References: <7mhdg4q983.wl%kuriyama@imgsrc.co.jp>
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Hi, On Jun 12, 2005, at 4:18 AM, Jun Kuriyama wrote: > > As of today's current: > > Acquiring lockmgr lock "ufs" with the following non-sleepable locks > held: > exclusive sleep mutex vnode pollinfo r = 0 (0xc4814000) locked @ / > usr/src/sys/kern/kern_event.c:881 > KDB: stack backtrace: > kdb_backtrace(1,3001,c3fa229c,c3a36780,ecf71a5c) at kdb_backtrace+0x29 > witness_warn(5,c070c378,c06a435b,c06ad03d) at witness_warn+0x18e > lockmgr(c3fa2278,3001,c3fa229c,c3a36780,ecf71a88) at lockmgr+0x8d > vop_stdlock(ecf71acc,c06f58c0,ecf71acc,ecf71a98,c0612184) at > vop_stdlock+0x1e > VOP_LOCK_APV(c06f5e00,ecf71acc,ecf71aac,c067caff,ecf71acc) at > VOP_LOCK_APV+0x87 > ffs_lock(ecf71acc,1001,c3fa2220,ecf71ae8,c0566634) at ffs_lock+0x10 > VOP_LOCK_APV(c06f58c0,ecf71acc) at VOP_LOCK_APV+0x87 > vn_lock(c3fa2220,1001,c3a36780) at vn_lock+0xa4 > filt_vfsread(c3ac9264,0,0,ffffffff,0) at filt_vfsread+0x3a > kqueue_register(c3dd6480,ecf71bf4,c3a36780,1,0) at kqueue_register > +0x668 > kern_kevent(c3a36780,4,1,0,ecf71cc8) at kern_kevent+0xc9 > kevent(c3a36780,ecf71d04,6,1,292) at kevent+0x55 > syscall(3b,3b,3b,1,804e068) at syscall+0x22f > Xint0x80_syscall() at Xint0x80_syscall+0x1f > --- syscall (363, FreeBSD ELF32, kevent), eip = 0x280b9503, esp = > 0xbfbfe8ec, ebp = 0xbfbfe938 --- This was introduced by my commit to take out the various kqueue operations outside of ufs. It is because we are trying to lock the vnode while holding the knlist mutex. I'll work on a fix on wednesday, as I'll unfortunately be a bit busy until then. I hope this won't cause you any inconvenience. Bye. -- Suleiman Souhlal | ssouhlal@vt.edu The FreeBSD Project | ssouhlal@FreeBSD.org
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