Date: Thu, 16 Jun 2005 08:43:28 -0400 From: Suleiman Souhlal <ssouhlal@FreeBSD.org> To: delphij@delphij.net Cc: jeff@FreeBSD.org, freebsd-current@FreeBSD.org Subject: Re: Recent VFS locking vs kqueue Message-ID: <4A0C62C6-758B-4D54-9583-4B404EDD9643@FreeBSD.org> In-Reply-To: <1118912651.860.17.camel@spirit> References: <1118912651.860.17.camel@spirit>
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Hi On Jun 16, 2005, at 5:04 AM, Xin LI wrote: > Hi, Jeff and -current@, > > With a fresh -CURRENT kernel (today's source) I got the following > messages from console and /var/log/messages on my laptop, with a > "cvs -R > up -PdA 2>/dev/null" running on one console (which results in disk/fs > activities) and "tail -F /var/log/messages" (which uses kqueue > events). > > The kernel is built with ULE scheduler, PREEMPTION+FULL_PREEMPTION > enabled, and all debugging options, like INVARIANTS and WITESS turned > on. > > BTW. I have found something that can lead to panic: Negative nice > count, which indicates that there are some races in our code, but it > seems that the bug is not easy to exercise. Will report more > information/patches once I got some findings. > > Thanks in advance! > > Jun 16 16:44:09 spirit kernel: Acquiring lockmgr lock "ufs" with the > following non-sleepable locks held: > Jun 16 16:44:09 spirit kernel: exclusive sleep mutex kqueue r = 0 > (0xc1b60a00) locked @ /usr/src/sys/kern/kern_event.c:1524 > Jun 16 16:44:09 spirit kernel: exclusive sleep mutex vnode pollinfo > r = > 0 (0xc2074000) locked @ /usr/src/sys/kern/kern_event.c:1512 This has been reported before by Jun Kuriyama.. Unfortunately, I'm a little busy this week, so I've not had time to fix it yet, but hopefully, I'll have something this weekend. In the meantime, you can patch -R this: http://people.freebsd.org/ ~ssouhlal/testing/kqueue-hooks-20050603.diff . Bye. -- Suleiman Souhlal | ssouhlal@vt.edu The FreeBSD Project | ssouhlal@FreeBSD.org
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