Hi,
I tried adding an spa_export();spa_import() to the code snippet. I get a
similar crash while importing.
I/O failure (write on <unknown> off 0: zio 822ed40 [L0 unallocated]
4000L/400P DVA[0]=<0:1000:400> DVA[1]=<0:18001000:400> fletcher4 lzjb LE
contiguous birth=4116 fill=0
cksum=69c3a4acfc:2c42fdcaced5:c5231ffcb2285:2b8c1a5f2cb2bfd): error 28
Abort (core dumped)
I thought ztest could use an existing pool. Is that assumption wrong?
These are the stacks of interest.
d11d78b9 __lwp_park (81c3e0c, 81c3d70, 0) + 19
d11d1ad2 cond_wait_queue (81c3e0c, 81c3d70, 0, 0) + 3e
d11d1fbd _cond_wait (81c3e0c, 81c3d70) + 69
d11d1ffb cond_wait (81c3e0c, 81c3d70) + 24
d131e4d2 cv_wait (81c3e0c, 81c3d6c) + 5e
d12fe2dd txg_wait_synced (81c3cc0, 1014, 0) + 179
d12f9080 spa_config_update (819dac0, 0) + c4
d12f467a spa_import (8047657, 8181f88, 0) + 256
080510c6 main (2, 804749c, 80474a8) + b2
08050f22 _start (2, 8047650, 8047657, 0, 804765c, 8047678) + 7a
d131ed79 vpanic (d1341dbc, ca5cd248) + 51
d131ed9f panic (d1341dbc, d135a384, d135a724, d133a630, 0, 0) + 1f
d131921d zio_done (822ed40) + 455
d131c15d zio_next_stage (822ed40) + 161
d1318b92 zio_wait_for_children (822ed40, 11, 822ef30) + 6a
d1318c88 zio_wait_children_done (822ed40) + 18
d131c15d zio_next_stage (822ed40) + 161
d131ba83 zio_vdev_io_assess (822ed40) + 183
d131c15d zio_next_stage (822ed40) + 161
d1307011 vdev_mirror_io_done (822ed40) + 421
d131b8a2 zio_vdev_io_done (822ed40) + 36
d131c15d zio_next_stage (822ed40) + 161
d1318b92 zio_wait_for_children (822ed40, 11, 822ef30) + 6a
d1318c88 zio_wait_children_done (822ed40) + 18
d1306be6 vdev_mirror_io_start (822ed40) + 1d2
d131b862 zio_vdev_io_start (822ed40) + 34e
d131c313 zio_next_stage_async (822ed40) + 1ab
d131bb47 zio_vdev_io_assess (822ed40) + 247
d131c15d zio_next_stage (822ed40) + 161
d1307011 vdev_mirror_io_done (822ed40) + 421
d131b8a2 zio_vdev_io_done (822ed40) + 36
d131c15d zio_next_stage (822ed40) + 161
d1318b92 zio_wait_for_children (822ed40, 11, 822ef30) + 6a
d1318c88 zio_wait_children_done (822ed40) + 18
d1306be6 vdev_mirror_io_start (822ed40) + 1d2
d131b862 zio_vdev_io_start (822ed40) + 34e
d131c15d zio_next_stage (822ed40) + 161
d1318dc1 zio_ready (822ed40) + 131
d131c15d zio_next_stage (822ed40) + 161
d131b41b zio_dva_allocate (822ed40) + 343
d131c15d zio_next_stage (822ed40) + 161
d131bdcb zio_checksum_generate (822ed40) + 123
d131c15d zio_next_stage (822ed40) + 161
d1319873 zio_write_compress (822ed40) + 4af
d131c15d zio_next_stage (822ed40) + 161
d1318b92 zio_wait_for_children (822ed40, 1, 822ef28) + 6a
d1318c68 zio_wait_children_ready (822ed40) + 18
d131c313 zio_next_stage_async (822ed40) + 1ab
d1318b1f zio_nowait (822ed40) + 1b
d12c6941 arc_write (82490c0, 819dac0, 7, 3, 2, 1014) + 1ed
d12ce7ae dbuf_sync (82bd008, 82490c0, 82beb40) + e6e
d12e2ecb dnode_sync (82ea090, 0, 82490c0, 82beb40) + 517
d12d663a dmu_objset_sync_dnodes (82a6e00, 82a6ee4, 82beb40) + 14e
d12d6983 dmu_objset_sync (82a6e00, 82beb40) + 137
d12ec20e dsl_pool_sync (81c3cc0, 1014, 0) + 182
d12f7db6 spa_sync (819dac0, 1014, 0) + 26e
d12fdf14 txg_sync_thread (81c3cc0) + 2a8
d11d7604 _thr_setup (ccdda400) + 52
d11d7860 _lwp_start (ccdda400, 0, 0, 0, 0, 0)
Regards,
Manoj
Manoj Joseph wrote:
> Hi,
>
> Trying to understand the zfs code, I was playing with libzpool - like
> ztest does.
>
> What I am trying to do is create an object in a zfs filesystem. But I am
> seeing failures when I try to sync changes.
>
> bash-3.00# ./udmu test Object 4 error: ZFS: I/O failure (write on
> <unknown> off 0: zio 81f5d00 [L0 unallocated] 200L/200P DVA[0]=<0:0:200>
> fletcher2 uncompressed LE contiguous birth=7 fill=0
> cksum=4141414141414141:4141:2828282828282820:82820): error 28
> Abort (core dumped)
>
> I can see that space does not get allocated and sync results in ENOSPC.
> There is plenty of space in the pool. So, that is not the issue. I guess
> I am missing the step of allocating space. Could someone help me figure
> out what it is?
>
> I have tried to follow what ztest does. This is what I do:
>
> <code snippet>
> kernel_init(FREAD | FWRITE);
> buf = malloc(BUF_SIZE);
> memset(buf, 'A', BUF_SIZE);
>
> error = dmu_objset_open(osname, DMU_OST_ZFS, DS_MODE_PRIMARY, &os);
> if (error) {
> fprintf(stderr, "dmu_objset_open() = %d", error);
> return (error);
> }
> tx = dmu_tx_create(os);
> dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, BUF_SIZE);
> // dmu_tx_hold_bonus(tx, DMU_NEW_OBJECT);
>
> error = dmu_tx_assign(tx, TXG_WAIT);
> if (error) {
> dmu_tx_abort(tx);
> return (error);
> }
>
> object = dmu_object_alloc(os, DMU_OT_UINT64_OTHER, 0,
> DMU_OT_NONE, 0, tx);
>
> printf("Object %lld\n", object);
>
> dmu_write(os, object, 0, BUF_SIZE, buf, tx);
> dmu_tx_commit(tx);
>
> txg_wait_synced(dmu_objset_pool(os), 0);
> </code snippet>
>
> It is interesting that the checksum that is reported is the pattern that
> I try to write.
>
> This is the panic stack:
> d11d8e65 _lwp_kill (98, 6) + 15
> d1192102 raise (6) + 22
> d1170dad abort (81f5d00, d1354000, ce3fdcc8, ce3fdcbc, d13c0568,
> ce3fdcbc) + cd
> d131ed79 vpanic (d1341dbc, ce3fdcc8) + 51
> d131ed9f panic (d1341dbc, d135a384, d135a724, d133a630, 0, 0) + 1f
> d131921d zio_done (81f5d00) + 455
> d131c15d zio_next_stage (81f5d00) + 161
> d1318b92 zio_wait_for_children (81f5d00, 11, 81f5ef0) + 6a
> d1318c88 zio_wait_children_done (81f5d00) + 18
> d131c15d zio_next_stage (81f5d00) + 161
> d131ba83 zio_vdev_io_assess (81f5d00) + 183
> d131c15d zio_next_stage (81f5d00) + 161
> d1307011 vdev_mirror_io_done (81f5d00) + 421
> d131b8a2 zio_vdev_io_done (81f5d00, 0, d0e0ac00, d1210000, d11ba2df, 3)
> + 36
> d131f585 taskq_thread (81809c0) + 89
> d11d7604 _thr_setup (d0e0ac00) + 52
> d11d7860 _lwp_start (d0e0ac00, 0, 0, 0, 0, 0)
>
> Thanks in advance!
>
> Regards,
> Manoj
