9.2-RELEASE amd64 panic: vn_open_cred

[Matt Magoffin]

Hello,

I have been running a generic 9.1 kernel for some time, and tried to upgrade to 9.2. The upgrade itself goes smoothly, but after running a few minutes I get a panic like this:

panic: vm_fault: fault on nofault entry, addr: ffffff836e0fc000
cpuid = 0
KDB: stack backtrace:
n0 0xffffffff80947986 at kdb_backtrace+0x66
n1 0xffffffff8090d9ae at panic+0x1ce
nz 0xffffffff80b79eca at vm_fault_hold+0x1f8a
n3 0xffffffff80b7a663 at vm_fault+0x73
n4 0xffffffff80cf260f at trap_pfault+0x3~f
ns 0xffffffff80cf29e4 at trap+0x344
n6 0xffffffff80cdbd13 at calltrap+0x8
n? 0xffffffff80d96898 at VOP_ADD_WRITECOUNT_APV+0x78
na 0xffffffff809bad48 at vn_open_cred+0x5d8
n9 0xffffffff809b676a at kern_openat+0x20a
n10 0xffffffff80cf187a at amd64_syscall+0x5ea
n11 0xffffffff80cdbff7 at Xfast_syscall+0xf7
Uptime: 5m24s

This is a production system for which I don't have a similar setup to test changes on, so I rolled back (via a zfs snapshot) to 9.1 after the panic consistently happened after rebooting. I can't say with certainty what was causing the crash: after booting I performed my usual system tasks which involved mounting some pefs filesystems (and thus loading the pefs kernel module) and starting up a Postgres server.

After rolling back to 9.1 I did repeat the upgrade process and ended up with the same panic, so I have since left it in 9.1.

I'm afraid I'm relatively new to FreeBSD, so I don't have any crash dumps. I wondered if anyone had any ideas on what might be causing this type of panic?

Cheers,
Matt
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