Date: Mon, 04 Feb 2008 10:18:54 -0500 From: Stephen Clark <Stephen.Clark@seclark.us> To: freebsd-stable@freebsd.org Subject: debugging 6.1 crash Message-ID: <47A72CDE.20101@seclark.us>
next in thread | raw e-mail | index | archive | help
Hello List,
I am trying to debug a 6.1 panic. When I run kgdb kernel.debug
/var/crash/vmcore.7 all I get is:
kgdb: kvm_read: invalid address (0x24)
kgdb: kvm_read: invalid address (0x24)
kgdb: kvm_read: invalid address (0x24)
kgdb: kvm_read: invalid address (0x24)
kgdb: kvm_read: invalid address (0x24)
kgdb: kvm_read: invalid address (0x24)
kgdb: kvm_read: invalid address (0x24)
...
the info file shows:
Dump header from device /dev/ad0s1b
Architecture: i386
Architecture Version: 2
Dump Length: 116981760B (111 MB)
Blocksize: 512
Dumptime: Mon Feb 4 04:13:09 2008
Hostname: G301482.netws.com
Magic: FreeBSD Kernel Dump
Version String: FreeBSD 6.1-STABLE #25: Wed Nov 14 10:30:01 EST 2007
root@J301002.nwv01.com:/mnt/src/sys/i386/compile/WOLFPAC6SMP
Panic String: page fault
Dump Parity: 1156397610
Bounds: 7
Dump Status: good
Does my kernel.debug have to match exactly the crash file kernel. I have
made the following change
to my kernel that the kernel.debug is based on.
--- route.h.orig Tue Apr 4 22:07:23 2006
+++ route.h Mon Dec 17 13:11:44 2007
@@ -289,6 +289,7 @@
#define RT_LOCK_INIT(_rt) \
mtx_init(&(_rt)->rt_mtx, "rtentry", NULL, MTX_DEF | MTX_DUPOK)
#define RT_LOCK(_rt) mtx_lock(&(_rt)->rt_mtx)
+#define RT_TRYLOCK(_rt) mtx_trylock(&(_rt)->rt_mtx)
#define RT_UNLOCK(_rt) mtx_unlock(&(_rt)->rt_mtx)
#define RT_LOCK_DESTROY(_rt) mtx_destroy(&(_rt)->rt_mtx)
#define RT_LOCK_ASSERT(_rt) mtx_assert(&(_rt)->rt_mtx, MA_OWNED)
--- route.c.orig Tue Oct 30 19:07:54 2007
+++ route.c Mon Dec 17 15:13:20 2007
@@ -996,6 +996,7 @@
struct radix_node_head *rnh = rt_tables[dst->sa_family];
int dlen = SA_SIZE(dst), glen = SA_SIZE(gate);
+again:
RT_LOCK_ASSERT(rt);
/*
@@ -1029,7 +1030,15 @@
RT_REMREF(rt);
return (EADDRINUSE); /* failure */
}
- RT_LOCK(rt);
+ /*
+ * Try to reacquire the lock on rt, and if it fails,
+ * clean state and restart from scratch.
+ */
+ if (!RT_TRYLOCK(rt)) {
+ RTFREE_LOCKED(gwrt);
+ RT_LOCK(rt);
+ goto again;
+ }
/*
* If there is already a gwroute, then drop it. If we
* are asked to replace route with itself, then do
Thanks,
Steve
--
"They that give up essential liberty to obtain temporary safety,
deserve neither liberty nor safety." (Ben Franklin)
"The course of history shows that as a government grows, liberty
decreases." (Thomas Jefferson)
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?47A72CDE.20101>