Panic in unmount() (Re: tree may not be buildable for an hour.)

[Kris Kennaway]

On Mon, Jan 24, 2005 at 05:56:48AM -0500, Jeff Roberson wrote:
> That's all of it.  If you wait for your cvsup mirror to catch up, you can
> try running with a smpsafe vfs by setting the debug.mpsafevfs tunable.
> This option requires mpsafevm as well.  I have two known bugs that have
> only been triggered by peter holm's excellent stress suite, but none are
> known to cause problems if mpsafevfs is disabled, and none of them have
> been seen on normal systems to my knowledge.

This happened on a machine with mpsafevfs=1 and DEBUG_LOCKS

panic: vm_fault: fault on nofault entry, addr: deadc000
cpuid = 1
KDB: enter: panic
[thread pid 13312 tid 100135 ]
Stopped at      kdb_enter+0x30: leave
db> tr
Tracing pid 13312 tid 100135 td 0xc383e730
kdb_enter(c06f4e4a,1,c0709378,bb6,c383e730) at kdb_enter+0x30
panic(c0708e4f,deadc000,1,edfe9a30,edfe9a20) at panic+0x13e
vm_fault(c1059000,deadc000,1,0,c383e730) at vm_fault+0x23a
trap_pfault(edfe9af8,0,deadc0de,35,deadc0de) at trap_pfault+0x166
trap(ffff0018,7fff0010,10,c06f42be,deadc0de) at trap+0x34c
calltrap() at calltrap+0x5
--- trap 0xc, eip = 0xc05900e8, esp = 0xedfe9b38, ebp = 0xedfe9b38 ---
strlen(deadc0de,edfe9c24,edfe9b78,0,a) at strlen+0x8
kvprintf(c06f42a3,c053d716,edfe9c24,a,edfe9c68) at kvprintf+0x693
vsnprintf(c0754a60,100,c06f42a3,edfe9c64,c383e730) at vsnprintf+0x3c
panic(c06f42a3,deadc0de,c06fd180,390,c0516286) at panic+0xb8
_mtx_lock_flags(c3766860,0,c06fd180,390,c0754820) at _mtx_lock_flags+0x6b
dounmount(c3766800,8080000,c383e730,37b,508ff10) at dounmount+0x59
unmount(c383e730,edfe9d14,8,28149000,2) at unmount+0x271
syscall(2f,2f,2f,804a458,804f421) at syscall+0x271
Xint0x80_syscall() at Xint0x80_syscall+0x1f
--- syscall (22, FreeBSD ELF32, unmount), eip = 0x280b8af7, esp = 0xbfbfe4ec, ebp = 0xbfbfe598 ---

Kris
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