Date: Fri, 2 Dec 2005 08:54:18 -0500 From: John Baldwin <jhb@freebsd.org> To: freebsd-hackers@freebsd.org Cc: Yuri Khotyaintsev <yuri@irfu.se>, freebsd-stable@freebsd.org Subject: Re: Fatal trap 12: page fault while in kernel mode Message-ID: <200512020854.20959.jhb@freebsd.org> In-Reply-To: <200512021100.03167.yuri@irfu.se> References: <200512021100.03167.yuri@irfu.se>
next in thread | previous in thread | raw e-mail | index | archive | help
On Friday 02 December 2005 05:00 am, Yuri Khotyaintsev wrote: > I have the following panic occurring several times a week. The machine is > an NFS server, and it usually panics early in the morning, when first > people try to access it. After reboot it may work OK for 1-2 days, and th= en > panics again. I have tried changing memory and replacing disk which was > exported via NFS, but nothing helped :( > > Any suggestion on how to fix this panic will be very much appreciated ! This panic (in propagate_priority) is usually caused when a thread goes to= =20 sleep while holding a mutex (which is forbidden). If you enable INVARIANTS= =20 and/or WITNESS you should get a better panic, and with WITNESS you will eve= n=20 be warned when a thread goes to sleep while holding a mutex. However, thes= e=20 options do introduce considerable execution overhead, and sometimes that=20 overhead changes the timing enough to hide the race. :( =2D-=20 John Baldwin <jhb@FreeBSD.org> =A0<>< =A0http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" =A0=3D =A0http://www.FreeBSD.org
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200512020854.20959.jhb>