Date: Tue, 25 Mar 2003 18:10:20 -0500 (EST) From: Andrew Gallatin <gallatin@cs.duke.edu> To: Martin Karlsson <mk-freebsd@bredband.net> Cc: freebsd-current@freebsd.org Subject: Re: panic: blockable sleep lock (sleep mutex) Giant @ /usr/src/sys/vm/vm_fault.c:206 Message-ID: <16000.57820.971424.771124@grasshopper.cs.duke.edu> In-Reply-To: <20030325213403.GA715@c-303a70d5.bredbandsbolaget.se> References: <20030325213403.GA715@c-303a70d5.bredbandsbolaget.se>
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Martin Karlsson writes:
> #9 0xc02dca88 in calltrap () at {standard input}:96
> #10 0xc01e7b0b in panic (fmt=0x0) at /usr/src/sys/kern/kern_shutdown.c:528
> #11 0xc020256e in witness_lock (lock=0xc03760c0, flags=8, file=0xc0332416 "/usr/src/sys/vm/vm_fault.c", line=206)
> at /usr/src/sys/kern/subr_witness.c:604
> #12 0xc01e0237 in _mtx_lock_flags (m=0xc03760c0, opts=0, file=0xc0332416 "/usr/src/sys/vm/vm_fault.c", line=206) at /usr/src/sys/kern/kern_mutex.c:336
It looks like the witness mutex debugging system crashed. This sort
of thing tends to happen when the witness data structures become
corrupt. A frequent cause of this is a module failing to destroy a
mutex.
I think the recent addition of the
MTX_SYSINIT(linux_osname, &osname_lock, "linux osname", MTX_DEF);
could be causing the problem, as I do not see how its getting torn
down.
Can you try the following patch (it may not even compile, I don't
have a current box handy):
(its obviously incomplete, just intended to see if it fixes the
problem you are seeing)
Drew
Index: compat/linux/linux_mib.c
===================================================================
RCS file: /home/ncvs/src/sys/compat/linux/linux_mib.c,v
retrieving revision 1.19
diff -u -r1.19 linux_mib.c
--- compat/linux/linux_mib.c 13 Mar 2003 22:45:43 -0000 1.19
+++ compat/linux/linux_mib.c 25 Mar 2003 23:05:08 -0000
@@ -50,7 +50,7 @@
SYSCTL_NODE(_compat, OID_AUTO, linux, CTLFLAG_RW, 0,
"Linux mode");
-static struct mtx osname_lock;
+struct mtx osname_lock;
MTX_SYSINIT(linux_osname, &osname_lock, "linux osname", MTX_DEF);
static char linux_osname[LINUX_MAX_UTSNAME] = "Linux";
Index: i386/linux/linux_sysvec.c
===================================================================
RCS file: /home/ncvs/src/sys/i386/linux/linux_sysvec.c,v
retrieving revision 1.116
diff -u -r1.116 linux_sysvec.c
--- i386/linux/linux_sysvec.c 21 Mar 2003 19:49:34 -0000 1.116
+++ i386/linux/linux_sysvec.c 25 Mar 2003 23:07:36 -0000
@@ -885,6 +885,7 @@
&linux_glibc2brand,
NULL
};
+extern struct mtx osname_lock;
static int
linux_elf_modevent(module_t mod, int type, void *data)
@@ -925,6 +926,7 @@
linux_ioctl_unregister_handler(*lihp);
if (bootverbose)
printf("Linux ELF exec handler removed\n");
+ mtx_destroy(&osname_lock);
} else
printf("Could not deinstall ELF interpreter entry\n");
break;
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