ZFS Kernel Panic on 10.0-RELEASE

Mike Carlson mike at bayphoto.com
Mon Jun 2 18:30:38 UTC 2014 

On 6/2/2014 11:24 AM, Mike Carlson wrote:
> On 6/2/2014 10:35 AM, Steven Hartland wrote:
>> ----- Original Message ----- From: "Mike Carlson" <mike at bayphoto.com>
>>> I have a crash dump, its 3.2GB in size.
>>>
>>> How can I get this to the right people? I can put it up on S3, but 
>>> I'd prefer to limit its access since it may contain sensitive 
>>> information (we dont have local accounts aside from root, but better 
>>> to be safe)
>>
>> For starters can you put the top contents of core.X.txt somewhere.
>>
>> If there's sensitive info in there just the top kgdb section with
>> the backtrace will be good initially.
>>
>>    Regards
>>    Steve
>>
>>
> I don't have a core.0.txt, I only have:
>
>      ~/p/z/dump> ls -al
>    total 347690
>    drwxr-xr-x  3 mikec  wheel              8 Jun  2 03:25 .
>    drwxr-xr-x  4 mikec  wheel              5 Jun  2 10:44 ..
>    drwxrwxr-x  2 mikec  operator           2 Jun  2 03:07 .snap
>    -rw-r--r--  1 mikec  wheel              2 Jun  2 03:24 bounds
>    -rw-------  1 mikec  wheel            446 Jun  2 03:24 info.0
>    lrwxr-xr-x  1 mikec  wheel              6 Jun  2 03:25 info.last ->
>    info.0
>    -rw-------  1 mikec  wheel     3469885440 Jun  2 03:25 vmcore.0
>    lrwxr-xr-x  1 mikec  wheel              8 Jun  2 03:25 vmcore.last
>    -> vmcore.0
>
> But, here is the kgdb output (with backtrace):
>
>      ~/p/z/dump> cat ../kgdb_backtrace.txt
>    <118>root@:/ # zfs set canmount=on zroot/data/working
>    <118>root@:/ # zfs mount zroot/data/working
>
>
>    Fatal trap 12: page fault while in kernel mode
>    cpuid = 14; apic id = 22
>    fault virtual address   = 0x4a0
>    fault code              = supervisor read data, page not present
>    instruction pointer     = 0x20:0xffffffff8185a39f
>    stack pointer           = 0x28:0xfffffe1834608570
>    frame pointer           = 0x28:0xfffffe18346085b0
>    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         = 2 (txg_thread_enter)
>    trap number             = 12
>    panic: page fault
>    cpuid = 14
>    KDB: stack backtrace:
>    #0 0xffffffff808e7ee0 at kdb_backtrace+0x60
>    #1 0xffffffff808af9c5 at panic+0x155
>    #2 0xffffffff80c8e7b2 at trap_fatal+0x3a2
>    #3 0xffffffff80c8ea89 at trap_pfault+0x2c9
>    #4 0xffffffff80c8e216 at trap+0x5e6
>    #5 0xffffffff80c754b2 at calltrap+0x8
>    #6 0xffffffff8182eb5a at dsl_dataset_block_kill+0x3a
>    #7 0xffffffff8182b967 at dnode_sync+0x237
>    #8 0xffffffff81823fcb at dmu_objset_sync_dnodes+0x2b
>    #9 0xffffffff81823e4d at dmu_objset_sync+0x1ed
>    #10 0xffffffff8183829a at dsl_pool_sync+0xca
>    #11 0xffffffff81853a4e at spa_sync+0x52e
>    #12 0xffffffff8185c925 at txg_sync_thread+0x375
>    #13 0xffffffff80881a9a at fork_exit+0x9a
>    #14 0xffffffff80c759ee at fork_trampoline+0xe
>    Uptime: 26m15s
>    Dumping 3309 out of 98234
>    MB:..1%..11%..21%..31%..41%..51%..61%..71%..81%..91%
>
>    Reading symbols from /boot/kernel/zfs.ko.symbols...done.
>    Loaded symbols for /boot/kernel/zfs.ko.symbols
>    Reading symbols from /boot/kernel/opensolaris.ko.symbols...done.
>    Loaded symbols for /boot/kernel/opensolaris.ko.symbols
>    #0  doadump (textdump=<value optimized out>) at pcpu.h:219
>    219             __asm("movq %%gs:%1,%0" : "=r" (td)
>    (kgdb) backtrace
>    #0  doadump (textdump=<value optimized out>) at pcpu.h:219
>    #1  0xffffffff808af640 in kern_reboot (howto=260) at
>    /usr/src/sys/kern/kern_shutdown.c:447
>    #2  0xffffffff808afa04 in panic (fmt=<value optimized out>) at
>    /usr/src/sys/kern/kern_shutdown.c:754
>    #3  0xffffffff80c8e7b2 in trap_fatal (frame=<value optimized out>,
>    eva=<value optimized out>) at /usr/src/sys/amd64/amd64/trap.c:882
>    #4  0xffffffff80c8ea89 in trap_pfault (frame=0xfffffe18346084c0,
>    usermode=0) at /usr/src/sys/amd64/amd64/trap.c:699
>    #5  0xffffffff80c8e216 in trap (frame=0xfffffe18346084c0) at
>    /usr/src/sys/amd64/amd64/trap.c:463
>    #6  0xffffffff80c754b2 in calltrap () at
>    /usr/src/sys/amd64/amd64/exception.S:232
>    #7  0xffffffff8185a39f in bp_get_dsize_sync (spa=0xfffff80041835000,
>    bp=0xfffffe001b8a1780)
>         at
> /usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/zfs/spa_misc.c:1635
>    #8  0xffffffff8182eb5a in dsl_dataset_block_kill
>    (ds=0xfffff800410fec00, bp=0xfffffe001b8a1780,
>    tx=0xfffff8004faa0600, async=0)
>         at
> /usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c:129
>    #9  0xffffffff8182b967 in dnode_sync (dn=0xfffff8004fe626c0,
>    tx=0xfffff8004faa0600) at
> /usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/zfs/dnode_sync.c:128
>    #10 0xffffffff81823fcb in dmu_objset_sync_dnodes
>    (list=0xfffff80041956b10, newlist=<value optimized out>, tx=<value
>    optimized out>)
>         at
> /usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/zfs/dmu_objset.c:945
>    #11 0xffffffff81823e4d in dmu_objset_sync (os=0xfffff80041956800,
>    pio=0xfffff800418c43b0, tx=0xfffff8004faa0600)
>         at
> /usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/zfs/dmu_objset.c:1062
>    #12 0xffffffff8183829a in dsl_pool_sync (dp=0xfffff8004183c000,
>    txg=<value optimized out>)
>         at
> /usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_pool.c:413
>    #13 0xffffffff81853a4e in spa_sync (spa=0xfffff80041835000,
>    txg=3373534) at
> /usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/zfs/spa.c:6410
>    #14 0xffffffff8185c925 in txg_sync_thread (arg=0xfffff8004183c000)
>    at
> /usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/zfs/txg.c:515
>    #15 0xffffffff80881a9a in fork_exit (callout=0xffffffff8185c5b0
>    <txg_sync_thread>, arg=0xfffff8004183c000, frame=0xfffffe1834608ac0)
>    at /usr/src/sys/kern/kern_fork.c:995
>    #16 0xffffffff80c759ee in fork_trampoline () at
>    /usr/src/sys/amd64/amd64/exception.S:606
>    #17 0x0000000000000000 in ?? ()
>    Current language:  auto; currently minimal
>
>
> If anyone wants to help out and check out the vmcore file, email me 
> off the list and I'll provide a S3 url of the tar'd + xz file.
>
> Thanks,
> Mike C
Oh, also, here is the output of list **0xffffffff8185a39f

    (kgdb) list *0xffffffff8185a39f
    0xffffffff8185a39f is in bp_get_dsize_sync
    (/usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/zfs/spa_misc.c:1635).
    warning: Source file is more recent than executable.

    1630
    1631            ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0);
    1632
    1633            if (asize != 0 && spa->spa_deflate) {
    1634                    vdev_t *vd = vdev_lookup_top(spa,
    DVA_GET_VDEV(dva));
    1635                    dsize = (asize >> SPA_MINBLOCKSHIFT) *
    vd->vdev_deflate_ratio;
    1636            }
    1637
    1638            return (dsize);
    1639    }


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