Date: Mon, 23 Apr 2007 11:55:52 -0400 From: Kris Kennaway <kris@obsecurity.org> To: Kai <kai@xs4all.nl> Cc: stable@freebsd.org Subject: Re: Fatal trap 12: page fault while in kernel mode Message-ID: <20070423155552.GB1006@xor.obsecurity.org> In-Reply-To: <20070423153547.GD20155@xs4all.nl> References: <20070411105332.GC7847@xs4all.nl> <20070419123329.GA10189@xs4all.nl> <20070423153547.GD20155@xs4all.nl>
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[-- Attachment #1 --] On Mon, Apr 23, 2007 at 05:35:47PM +0200, Kai wrote: > On Thu, Apr 19, 2007 at 02:33:29PM +0200, Kai wrote: > > On Wed, Apr 11, 2007 at 12:53:32PM +0200, Kai wrote: > > > > > > Hello all, > > > > > > We're running into regular panics on our webserver after upgrading > > > from 4.x to 6.2-stable: > > > > Hi all, > > To continue this story, a colleague wrote a small program in C that launches > 40 threads to randomly append and write to 10 files on an NFS mounted > filesystem. > > If I keep removing the files on one of the other machines in a while loop, > the first system panics: > > Fatal trap 12: page fault while in kernel mode > cpuid = 1; apic id = 01 > fault virtual address = 0x34 > fault code = supervisor read, page not present > instruction pointer = 0x20:0xc06bdefa > stack pointer = 0x28:0xeb9f69b8 > frame pointer = 0x28:0xeb9f69c4 > code segment = base 0x0, limit 0xfffff, type 0x1b > = DPL 0, pres 1, def32 1, gran 1 > processor eflags = interrupt enabled, resume, IOPL = 0 > current process = 73626 (nfscrash) > trap number = 12 > panic: page fault > cpuid = 1 > Uptime: 3h2m14s > > Sounds like a nice denial of service problem. I can hand the program to > developers on request. Please send it to me. Panics are always much easier to get fixed if they come with a test case that developer can use to reproduce it. Kris [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (FreeBSD) iD8DBQFGLNcIWry0BWjoQKURAkD+AKDu5NG+iAB8NxPfYyYGqB76SvhxVQCffMa/ 8TLB5wrCMJusQNw3R+QqFHU= =3k9X -----END PGP SIGNATURE-----
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