Re: (zfs) panic: lock &arg.lock already initialized

File a PR and assign it to me.

On Wed, Jun 10, 2009 at 8:16 AM, Emil Mikulic<emikulic_at_gmail.com> wrote:
> On doing "zfs destroy" of a snapshot, I got this panic:
>
> Unread portion of the kernel message buffer:
> panic: lock &arg.lock already initialized
> cpuid = 0
> KDB: enter: panic
> Physical memory: 4049 MB
> Dumping [etc]
>
> (kgdb) where
> [...]
> #9  0xffffffff80568c5b in panic (fmt=Variable "fmt" is not available.
> ) at /usr/src/sys/kern/kern_shutdown.c:558
> #10 0xffffffff8105754e in dsl_dataset_destroy_sync (arg1=0xffffff0005605c00,
>    tag=0xffffff000b68c550, cr=0xffffff0005f79e00, tx=0xffffff0005932680)
>    at /usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c:1422
> #11 0xffffffff81059ecb in dsl_sync_task_group_sync (dstg=0xffffff000b7b9080,
>    tx=0xffffff0005932680)
>    at /usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_synctask.c:186
> #12 0xffffffff810599f3 in dsl_pool_sync (dp=0xffffff0005606800, txg=75028)
>    at /usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_pool.c:316
> #13 0xffffffff810683c5 in spa_sync (spa=0xffffff0005549000, txg=75028)
>    at /usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/zfs/spa.c:3988
> #14 0xffffffff8107047f in txg_sync_thread (arg=Variable "arg" is not available.
> )
>    at /usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/zfs/txg.c:352
> #15 0xffffffff8054179a in fork_exit (
>    callout=0xffffffff810701f0 <txg_sync_thread>, arg=0xffffff0005606800,
>    frame=0xffffff81297f4c90) at /usr/src/sys/kern/kern_fork.c:828
> #16 0xffffffff8081b32e in fork_trampoline ()
>    at /usr/src/sys/amd64/amd64/exception.S:552
> #17 0x0000000000000000 in ?? ()
> #18 0x0000000000000000 in ?? ()
> #19 0x0000000000000001 in ?? ()
> #20 0x0000000000000000 in ?? ()
> [more question marks...]
> (kgdb) frame 10
> (kgdb) list
> 1417    static void
> 1418    dsl_dataset_drain_refs(dsl_dataset_t *ds, void *tag)
> 1419    {
> 1420            struct refsarg arg;
> 1421
> 1422 ---------> mutex_init(&arg.lock, NULL, MUTEX_DEFAULT, NULL); <-----------
> 1423            cv_init(&arg.cv, NULL, CV_DEFAULT, NULL);
> 1424            arg.gone = FALSE;
> 1425            (void) dmu_buf_update_user(ds->ds_dbuf, ds, &arg, &ds->ds_phys,
> 1426                dsl_dataset_refs_gone);
>
> I'm running svn r193609 on dual-core amd64, kernel config is GENERIC
> minus WITNESS and WITNESS_SKIPSPIN.
>
> Is there any other info I can provide to help debug this?
>
> --Emil
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