Date: Fri, 24 Oct 2003 21:31:57 +0200 From: Thomas Moestl <t.moestl@tu-bs.de> To: Alex Deiter <tiamat@komi.mts.ru> Cc: Kris Kennaway <kris@obsecurity.org> Subject: Re: panic: trap: fast data access mmu miss Message-ID: <20031024193157.GA2834@timesink.dyndns.org> In-Reply-To: <004d01c399ec$fefe5c00$b901320a@komi.mts.ru> References: <034001c39962$c8056f70$b901320a@komi.mts.ru> <20031023190138.GA84526@rot13.obsecurity.org> <004d01c399ec$fefe5c00$b901320a@komi.mts.ru>
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On Fri, 2003/10/24 at 09:09:25 +0400, Alex Deiter wrote:
> panic: trap: fast data access mmu miss
> cpuid = 0;
> Debugger("panic")
> Stopped at Debugger+0x1c: ta %xcc, 1
> db> tr
> panic() at panic+0x174
> trap() at trap+0x394
> -- fast data access mmu miss tar=0 %o7=0xc018b820 --
> quotactl() at quotactl+0x98
> syscall() at syscall+0x308
> -- syscall (148, FreeBSD ELF64, quotactl) %o7=0x1e3044 --
> userland() at 0x41187e88
> user trace: trap %o7=0x1e3044
> pc 0x41187e88, sp 0x7fdffffe221
> pc 0x15149c, sp 0x7fdffffe321
> pc 0x151818, sp 0x7fdffffe871
> pc 0x1c771c, sp 0x7fdffffe931
> pc 0x1a6938, sp 0x7fdffffea01
> pc 0x1b3904, sp 0x7fdffffec81
> pc 0x1d987c, sp 0x7fdffffedc1
> pc 0x1d99c0, sp 0x7fdffffeec1
> pc 0x1da06c, sp 0x7fdffffefa1
> pc 0x1db99c, sp 0x7fdfffff071
> pc 0x451ea8, sp 0x7fdfffff161
> pc 0x133560, sp 0x7fdfffff3f1
> pc 0x405d3f94, sp 0x7fdfffff4b1
> done
I believe that the attached patch should fix that; the panic is not
sparc64-specific, and should occur on all file systems that do not
define a vop_getwritemount method.
- Thomas
--
Thomas Moestl <t.moestl@tu-bs.de> http://www.tu-bs.de/~y0015675/
<tmm@FreeBSD.org> http://people.FreeBSD.org/~tmm/
PGP fingerprint: 1C97 A604 2BD0 E492 51D0 9C0F 1FE6 4F1D 419C 776C
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Index: vfs_syscalls.c
===================================================================
RCS file: /vol/ncvs/src/sys/kern/vfs_syscalls.c,v
retrieving revision 1.331
diff -u -r1.331 vfs_syscalls.c
--- vfs_syscalls.c 21 Aug 2003 13:53:01 -0000 1.331
+++ vfs_syscalls.c 24 Oct 2003 19:08:29 -0000
@@ -189,7 +189,7 @@
caddr_t arg;
} */ *uap;
{
- struct mount *mp;
+ struct mount *mp, *wmp;
int error;
struct nameidata nd;
@@ -199,12 +199,13 @@
if ((error = namei(&nd)) != 0)
return (error);
NDFREE(&nd, NDF_ONLY_PNBUF);
- error = vn_start_write(nd.ni_vp, &mp, V_WAIT | PCATCH);
+ error = vn_start_write(nd.ni_vp, &wmp, V_WAIT | PCATCH);
+ mp = nd.ni_vp->v_mount;
vrele(nd.ni_vp);
if (error)
return (error);
error = VFS_QUOTACTL(mp, uap->cmd, uap->uid, uap->arg, td);
- vn_finished_write(mp);
+ vn_finished_write(wmp);
return (error);
}
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