Date: Thu, 5 Feb 2004 09:10:33 -0800 From: Kris Kennaway <kris@obsecurity.org> To: Thomas Moestl <t.moestl@tu-bs.de> Cc: Kris Kennaway <kris@obsecurity.org> Subject: Re: "panic: trap: fast data access mmu miss" on 5.2-C Message-ID: <20040205171033.GA17574@xor.obsecurity.org> In-Reply-To: <20040205143536.GA712@timesink.dyndns.org> References: <20040201105032.GA17856@xor.obsecurity.org> <20040201164950.GB713@timesink.dyndns.org> <20040205085409.GA12282@xor.obsecurity.org> <20040205143536.GA712@timesink.dyndns.org>
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--ZPt4rx8FFjLCG7dd Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Feb 05, 2004 at 03:35:36PM +0100, Thomas Moestl wrote: > On Thu, 2004/02/05 at 00:54:09 -0800, Kris Kennaway wrote: > > On Sun, Feb 01, 2004 at 05:49:50PM +0100, Thomas Moestl wrote: > > > Looks like the back trace ran off the end of the stack; > > > db_stack_trace_cmd() only handles the usual starting points of kernel > > > stacks (traps from userland), but not freshly forked processes (or > > > kernel threads). The attached patch should fix that by initializing > > > the fr_pc and fr_fp fields of the first frame to 0 in cpu_fork(). >=20 > Did you get a witness backtrace ending in fork_trampoline() since? I just checked, and one occurred overnight without panicking. > > I'm getting another panic with this patch (transcribed manually): > >=20 > > fast data access mmu miss tar=3D0 %o7=3D0xc0114a0c > > copyin+0x5c > > pipe_write+0x568 > > dofilewrite+0xec > > write+0x3c > > syscall+0x314 >=20 > Is it possible that this is caused by the bug which rwatson fixed in > r1.166 of sys/sys_pipe.c (i.e. do you have r1.165 of that file)? Oops, you're right. I thought I had CVS updated again to rule this out. Thanks, Kris --ZPt4rx8FFjLCG7dd Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (FreeBSD) iD8DBQFAInkJWry0BWjoQKURAqRlAKCMjVGPM4y+ju0t9KGmDgvY2btPFwCg046I iKoKWJZ506ySPCrbJ8ykfKc= =ivqV -----END PGP SIGNATURE----- --ZPt4rx8FFjLCG7dd--
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