Date: Sat, 23 Feb 2002 20:21:34 +0000 From: Ian Dowse <iedowse@maths.tcd.ie> To: "Jan L. Peterson" <jlp@softhome.net> Cc: freebsd-stable@freebsd.org Subject: Re: crashes on 4.5-RELEASE Message-ID: <200202232021.aa04276@salmon.maths.tcd.ie> In-Reply-To: Your message of "Thu, 21 Feb 2002 15:10:44 MST." <20020221221044.D11E8422D0@mail.flipdog.com>
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In message <20020221221044.D11E8422D0@mail.flipdog.com>, "Jan L. Peterson" writ
es:
>The machine panics (sometimes right away, sometimes after several
>minutes). Here's the panic message:
>
>kernel: type 12 trap, code=0
>Stopped at nfs_realign+0xdb: incb 0(%eax,%edx,1)
It looks like some junk cluster pointer is ending up on the mbuf
cluster freelist. Try adding "options INVARIANTS" and "options
INVARIANT_SUPPORT" to your kernel config, and apply the following
patch in /usr/src/sys/sys. This won't fix the panics, but it should
hopefully narrow down the cause by panicking at the point that the
bad cluster pointer is first seen. Try to get a few stack traces
with this patch in place.
Ian
Index: mbuf.h
===================================================================
RCS file: /dump/FreeBSD-CVS/src/sys/sys/mbuf.h,v
retrieving revision 1.44.2.12
diff -u -r1.44.2.12 mbuf.h
--- mbuf.h 13 Feb 2002 00:43:11 -0000 1.44.2.12
+++ mbuf.h 20 Feb 2002 00:53:36 -0000
@@ -366,6 +366,10 @@
else \
(p) = NULL; \
} \
+ KASSERT((p) == NULL || ((char *)(p) >= (char *)mbutl && \
+ (char *)(p) < (char *)mbutl + \
+ mbstat.m_clusters * MCLBYTES + mbstat.m_mbufs * MSIZE), \
+ ("MCLALLOC: bad cluster %p", (p))); \
} while (0)
#define MCLGET(m, how) do { \
@@ -384,6 +388,10 @@
#define MCLFREE1(p) do { \
union mcluster *_mp = (union mcluster *)(p); \
\
+ KASSERT((char *)(p) >= (char *)mbutl && \
+ (char *)(p) < (char *)mbutl + \
+ mbstat.m_clusters * MCLBYTES + mbstat.m_mbufs * MSIZE, \
+ ("MCLFREE1: bad cluster %p", (p))); \
KASSERT(mclrefcnt[mtocl(_mp)] > 0, ("freeing free cluster")); \
if (--mclrefcnt[mtocl(_mp)] == 0) { \
_mp->mcl_next = mclfree; \
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