kern/161169: ZFS causes kernel panic in dbuf_dirty

Jakub Szafrański szafranski at
Fri Sep 30 18:50:03 UTC 2011

>Number:         161169
>Category:       kern
>Synopsis:       ZFS causes kernel panic in dbuf_dirty
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Sep 30 18:50:02 UTC 2011
>Originator:     Jakub Szafrański
>Release:        8.2-RELEASE-p3
FreeBSD 8.2-RELEASE-p3 FreeBSD 8.2-RELEASE-p3 #7: Wed Sep 28 17:06:07 CEST 2011     root at  amd64

FreeBSD 8.2-RELEASE-p3 seems to panic with ZFS dbuf_dirty function:

Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address  = 0x28
fault code             = supervisor read data, page not present
instruction pointer    = 0x20:0xffffffff80b488cb
stack pointer          = 0x28:0xffffff851544a550
frame pointer          = 0x28:0xffffff851544a600
code segment           = base 0x0, limit 0xfffff, type 0x1b
                       = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags       = interrupt enabled, resume, IOPL = 0
current process        = 46860 (nginx)
[thread pid 46860 tid 101076 ]
Stopped at      dbuf_dirty+0x1b:      movq     0x28(%rax),%rax
I don't know how to reproduce this bug, it happened only once.


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