On Mon, Jul 23, 2018 at 03:52:59PM +0800, Anand Jain wrote:
>
>
>On 07/21/2018 02:01 PM, Lu Fengqi wrote:
>> On Tue, Jul 03, 2018 at 05:07:24PM +0800, Anand Jain wrote:
>> > When a device is deleted, the btrfs_super_block::number_devices is
>> > reduced by 1, but we do that after the commit transaction, so this
>> > change did not made it to the disk and waits for the next commit
>> > transaction whenever it happens.
>> >
>> > This can be easily demonstrated using the following test case where I
>> > use the btrfs device ready cli to read the disk and report.
>> >
>> > mkfs.btrfs -fq -dsingle -msingle $dev1 $dev2
>> > mount $dev1 /btrfs
>> > btrfs dev del $dev2 /btrfs
>> > btrfs dev ready $dev1; echo RESULT=$? <-- 1
>> > Without this patch RESULT returns 1, indicating not ready!
>> >
>> > Testing with a seed device:
>> >
>> > mkfs.btrfs -fq $dev1
>> > btrfstune -S1 $dev1
>> > mount $dev1 /btrfs
>> > btrfs dev add -f $dev2 /btrfs
>> > umount /btrfs
>> > mount $dev2 /btrfs
>> > btrfs dev del $dev1 /btrfs
>> > btrfs dev ready $dev2; echo RESULT=$? <-- 1
>> >
>> > Fix this by bringing in the num_devices update with in the
>> > current commit transaction.
>> > Also align the local variable declarations in the function
>> > btrfs_rm_dev_item()
>> > Delete a todo comment about transient inconsistent state
>>
>> Hi, Anand
>>
>> The btrfs/164 failed when I run xfstests with kdave/misc-next.
>
> And the
>> result of git bisect shows this patch may be the cause. Please see the
>> following log and dmesg.
>>
>> xfstests log:
>> # sudo ./check btrfs/164
>> FSTYP -- btrfs
>> PLATFORM -- Linux/x86_64 larch 4.18.0-rc5+
>> MKFS_OPTIONS -- /dev/vdb2
>> MOUNT_OPTIONS -- /dev/vdb2 /mnt/scratch
>>
>> btrfs/164 14s ... [failed, exit status 1]
>>
>> dmesg:
>> [ 212.009967] general protection fault: 0000 [#1] SMP PTI
>> [ 212.015834] CPU: 1 PID: 5665 Comm: btrfs Tainted: G O
>> 4.18.0-rc5+ #2
>> [ 212.021985] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS
>> 0.0.0 02/06/2015
>> [ 212.031137] RIP: 0010:btrfs_update_commit_device_size+0x74/0xd0 [btrfs]
>
>
>Thanks for the report.
>
>
>--------------
>void btrfs_update_commit_device_size(struct btrfs_fs_info *fs_info)
>{
> struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
> struct btrfs_device *curr, *next;
>
> if (list_empty(&fs_devices->resized_devices))
> return;
>
> mutex_lock(&fs_devices->device_list_mutex);
> mutex_lock(&fs_info->chunk_mutex);
> list_for_each_entry_safe(curr, next, &fs_devices->resized_devices,
> resized_list) {
> list_del_init(&curr->resized_list); <---- GPF
> curr->commit_total_bytes = curr->disk_total_bytes;
> }
> mutex_unlock(&fs_info->chunk_mutex);
> mutex_unlock(&fs_devices->device_list_mutex);
>}
>--------------
>
>
>I can't reproduce the issue. Do you reproduce consistently? and I
Sorry I've taken so long to reply.
There are four virtual machines with the different storage backend here.
And I can reproduce this issue consistently on the virtual machines (with
HDD or qcow2 file in HDD), however, I can't reproduce on the virtual machine
(with SSD or qcow2 file in SSD). So this may depend on the disk IO speed.
>wonder if your workspace contains the latest changes from
>kdave/misc-next? Because last weeks kdave/misc had some issues.
>Can you please give a try?
I used the latest kdave/misc-next branch on July 21, 2018, when I send
the previous mail. Just as David replied to Nikolay's thread, the current
latest kdave/misc-next still has the same problem.
In addition, this case will not fail when I enable KASAN. But the something
found in dmesg may help you to investigate. I attached them below.
--
Thanks,
Lu
log:
# sudo ./check btrfs/164
FSTYP -- btrfs
PLATFORM -- Linux/x86_64 localhost 4.18.0-rc6+
MKFS_OPTIONS -- /dev/vdc1
MOUNT_OPTIONS -- /dev/vdc1 /mnt/scratch
btrfs/164 15s ... _check_dmesg: something found in dmesg (see
/home/luke/workspace/xfstests-dev/results//btrfs/164.dmesg)
Ran: btrfs/164
Failures: btrfs/164
Failed 1 of 1 tests
dmesg(KASAN enabled):
444.636617] ==================================================================
[ 444.639206] BUG: KASAN: use-after-free in
btrfs_update_commit_device_size+0x124/0x2c0 [btrfs]
[ 444.641234] Read of size 8 at addr ffff8801542ad1d0 by task btrfs/4575
[ 444.645210] CPU: 0 PID: 4575 Comm: btrfs Not tainted 4.18.0-rc6+ #4
[ 444.647150] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0
02/06/2015
[ 444.649351] Call Trace:
[ 444.650715] dump_stack+0xd1/0x16c
[ 444.652201] ? dump_stack_print_info.cold.1+0x2f/0x2f
[ 444.653924] ? kmsg_dump_rewind_nolock+0x59/0x59
[ 444.655637] ? btrfs_update_commit_device_size+0x124/0x2c0 [btrfs]
[ 444.657492] print_address_description+0x6c/0x23c
[ 444.659257] ? btrfs_update_commit_device_size+0x124/0x2c0 [btrfs]
[ 444.661083] kasan_report.cold.6+0x241/0x2fd
[ 444.662759] btrfs_update_commit_device_size+0x124/0x2c0 [btrfs]
[ 444.664598] ? btrfs_destroy_dev_replace_tgtdev+0x1f0/0x1f0 [btrfs]
[ 444.666573] ? btrfs_wait_block_group_reservations+0x280/0x280 [btrfs]
[ 444.668441] ? _raw_spin_unlock+0x24/0x30
[ 444.670091] ? btrfs_first_delayed_node+0xbd/0x100 [btrfs]
[ 444.672007] ? btrfs_reloc_post_snapshot+0x8d0/0x8d0 [btrfs]
[ 444.673941] ? kmem_cache_free+0x2a8/0x320
[ 444.675692] ? __btrfs_run_delayed_items+0x213/0x250 [btrfs]
[ 444.677600] btrfs_commit_transaction+0xce1/0x1540 [btrfs]
[ 444.679539] ? btrfs_apply_pending_changes+0x80/0x80 [btrfs]
[ 444.681363] ? rcu_is_watching+0x98/0xe0
[ 444.683032] ? check_chain_key+0x13b/0x200
[ 444.684649] ? check_flags.part.42+0x210/0x210
[ 444.686406] ? do_raw_spin_unlock+0x157/0x1e0
[ 444.688034] ? do_raw_spin_trylock+0x120/0x120
[ 444.689647] ? do_raw_spin_trylock+0xa0/0x120
[ 444.691271] ? mark_lock+0x116/0xb60
[ 444.692742] ? _raw_spin_unlock_irqrestore+0x43/0x50
[ 444.694471] ? depot_save_stack+0x288/0x470
[ 444.696018] ? save_stack+0x8c/0xb0
[ 444.697448] ? __kasan_slab_free+0x12e/0x180
[ 444.699023] ? kfree+0xf0/0x2f0
[ 444.700447] ? free_fs_devices+0x1e4/0x240 [btrfs]
[ 444.702288] ? btrfs_rm_device+0xbbd/0xc70 [btrfs]
[ 444.703983] ? btrfs_ioctl+0x4f7f/0x5470 [btrfs]
[ 444.705558] ? do_vfs_ioctl+0x134/0xac0
[ 444.707081] ? ksys_ioctl+0x60/0x90
[ 444.708419] ? __x64_sys_ioctl+0x3d/0x50
[ 444.709828] ? do_syscall_64+0x16b/0xc30
[ 444.711292] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 444.712846] ? do_raw_spin_trylock+0x120/0x120
[ 444.714321] ? do_raw_spin_trylock+0xa0/0x120
[ 444.715791] ? mark_held_locks+0x92/0xb0
[ 444.717183] ? _raw_spin_unlock_irqrestore+0x43/0x50
[ 444.718701] ? trace_hardirqs_on_caller+0x18c/0x280
[ 444.720240] ? quarantine_put+0xb7/0x150
[ 444.721585] ? __kasan_slab_free+0x143/0x180
[ 444.723060] ? free_fs_devices+0x1e4/0x240 [btrfs]
[ 444.724453] ? kfree+0xf0/0x2f0
[ 444.725685] ? free_fs_devices+0x1e4/0x240 [btrfs]
[ 444.727129] ? __blkdev_put+0x2f8/0x400
[ 444.728430] ? btrfs_free_device+0x50/0x50 [btrfs]
[ 444.729872] ? bd_set_size+0x170/0x170
[ 444.731190] btrfs_rm_device+0xbc6/0xc70 [btrfs]
[ 444.733412] ? btrfs_scratch_superblocks+0x170/0x170 [btrfs]
[ 444.735040] ? check_chain_key+0x13b/0x200
[ 444.736394] ? check_flags.part.42+0x210/0x210
[ 444.737738] ? ___might_sleep+0x184/0x250
[ 444.739078] ? cpu_extra_stat_show+0x10/0x10
[ 444.740449] ? _copy_from_user+0x7d/0xb0
[ 444.741759] btrfs_ioctl+0x4f7f/0x5470 [btrfs]
[ 444.743188] ? mark_lock+0x116/0xb60
[ 444.744426] ? print_usage_bug+0xf0/0xf0
[ 444.745760] ? cyc2ns_read_begin.part.1+0x67/0x90
[ 444.747225] ? btrfs_ioctl_get_supported_features+0x30/0x30 [btrfs]
[ 444.748844] ? alloc_set_pte+0x495/0x560
[ 444.750221] ? reacquire_held_locks+0xa8/0x1d0
[ 444.751612] ? alloc_set_pte+0x495/0x560
[ 444.752933] ? cyc2ns_read_begin.part.1+0x67/0x90
[ 444.754386] ? native_sched_clock+0xa9/0x130
[ 444.755773] ? cyc2ns_read_end+0x10/0x10
[ 444.757055] ? check_flags.part.42+0x210/0x210
[ 444.758457] ? check_chain_key+0x13b/0x200
[ 444.759812] ? __lock_acquire+0x779/0x2a10
[ 444.761175] ? lock_release+0x8a0/0x8a0
[ 444.763263] ? find_get_entries_tag+0x800/0x800
[ 444.764711] ? check_chain_key+0x13b/0x200
[ 444.766088] ? check_chain_key+0x13b/0x200
[ 444.767395] ? __lock_acquire+0x779/0x2a10
[ 444.768718] ? cyc2ns_read_begin.part.1+0x67/0x90
[ 444.770209] ? native_sched_clock+0xa9/0x130
[ 444.771541] ? cyc2ns_read_end+0x10/0x10
[ 444.772840] ? lock_release+0x8a0/0x8a0
[ 444.774159] ? check_chain_key+0x13b/0x200
[ 444.775485] ? check_flags.part.42+0x210/0x210
[ 444.776852] ? do_raw_spin_unlock+0x157/0x1e0
[ 444.778232] ? do_raw_spin_trylock+0x120/0x120
[ 444.779595] ? cyc2ns_read_begin.part.1+0x67/0x90
[ 444.780946] ? native_sched_clock+0xa9/0x130
[ 444.782319] ? cyc2ns_read_end+0x10/0x10
[ 444.783596] ? _raw_spin_unlock+0x24/0x30
[ 444.784875] ? check_chain_key+0x13b/0x200
[ 444.786205] ? check_flags.part.42+0x210/0x210
[ 444.787512] ? do_vfs_ioctl+0x134/0xac0
[ 444.788791] ? btrfs_ioctl_get_supported_features+0x30/0x30 [btrfs]
[ 444.790438] do_vfs_ioctl+0x134/0xac0
[ 444.791758] ? native_sched_clock+0xa9/0x130
[ 444.793248] ? ioctl_preallocate+0x180/0x180
[ 444.794629] ? ktime_get_coarse_real_ts64+0x140/0x190
[ 444.796134] ? __fget_light+0x198/0x220
[ 444.797368] ? fget_raw+0x10/0x10
[ 444.798634] ? ktime_mono_to_any+0x170/0x170
[ 444.800044] ? __audit_syscall_entry+0x22d/0x2a0
[ 444.801455] ksys_ioctl+0x60/0x90
[ 444.802741] __x64_sys_ioctl+0x3d/0x50
[ 444.803965] do_syscall_64+0x16b/0xc30
[ 444.805173] ? syscall_return_slowpath+0x610/0x610
[ 444.806651] ? handle_mm_fault+0x3da/0x590
[ 444.807919] ? rcu_note_context_switch+0x4e0/0x4e0
[ 444.809343] ? vmacache_find+0xbc/0x110
[ 444.810615] ? vmacache_update+0x68/0x80
[ 444.811869] ? up_read+0x3b/0x90
[ 444.813094] ? __do_page_fault+0x432/0x6d0
[ 444.814406] ? bad_area_access_error+0xf0/0xf0
[ 444.815807] ? lockdep_sys_exit+0x16/0x31
[ 444.817050] ? syscall_return_slowpath+0x18d/0x610
[ 444.818445] ? do_page_fault+0xa9/0x420
[ 444.819753] ? __do_page_fault+0x6d0/0x6d0
[ 444.821001] ? trace_hardirqs_on_thunk+0x1a/0x1c
[ 444.823102] ? prepare_exit_to_usermode+0x23e/0x310
[ 444.824555] ? lockdep_sys_exit+0x16/0x31
[ 444.825872] ? prepare_exit_to_usermode+0x119/0x310
[ 444.827361] ? tracehook_report_syscall_exit+0x180/0x180
[ 444.828806] ? mark_held_locks+0x23/0xb0
[ 444.830215] ? retint_user+0x18/0x18
[ 444.831436] ? page_fault+0x8/0x30
[ 444.832692] ? trace_hardirqs_off_thunk+0x1a/0x1c
[ 444.834107] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 444.835591] RIP: 0033:0x7f2626a8f667
[ 444.836885] Code: 00 00 90 48 8b 05 e9 67 2c 00 64 c7 00 26 00 00 00 48 c7
c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01
f0 ff ff 73 01 c3 48 8b 0d b9 67 2c 00 f7 d8 64 89 01 48
[ 444.842256] RSP: 002b:00007ffc4470ed58 EFLAGS: 00000202 ORIG_RAX:
0000000000000010
[ 444.844204] RAX: ffffffffffffffda RBX: 00007ffc44710f20 RCX: 00007f2626a8f667
[ 444.846120] RDX: 00007ffc4470fd80 RSI: 000000005000943a RDI: 0000000000000003
[ 444.847938] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
[ 444.849817] R10: fffffffffffff807 R11: 0000000000000202 R12: 00007ffc44710f20
[ 444.851761] R13: 0000000000000000 R14: 0000000000000003 R15: 00007ffc44710f28
[ 444.855000] Allocated by task 4534:
[ 444.856353] kasan_kmalloc+0xbf/0xe0
[ 444.857700] kmem_cache_alloc_trace+0x141/0x350
[ 444.859314] btrfs_alloc_device+0xe8/0x4d0 [btrfs]
[ 444.860867] close_fs_devices.part.44+0x282/0x4d0 [btrfs]
[ 444.862597] btrfs_close_devices+0x53/0xf0 [btrfs]
[ 444.864138] btrfs_mount_root+0xb2c/0xe80 [btrfs]
[ 444.865637] mount_fs+0x5c/0x1a3
[ 444.867064] vfs_kern_mount.part.38+0xa8/0x260
[ 444.868569] btrfs_mount+0x352/0x1170 [btrfs]
[ 444.870127] mount_fs+0x5c/0x1a3
[ 444.871471] vfs_kern_mount.part.38+0xa8/0x260
[ 444.873018] do_mount+0x36a/0x16b0
[ 444.874425] ksys_mount+0xba/0xd0
[ 444.875852] __x64_sys_mount+0x62/0x70
[ 444.877252] do_syscall_64+0x16b/0xc30
[ 444.878682] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 444.881439] Freed by task 4575:
[ 444.883336] __kasan_slab_free+0x12e/0x180
[ 444.884812] kfree+0xf0/0x2f0
[ 444.886153] rcu_process_callbacks+0x9d9/0x1ae0
[ 444.887633] __do_softirq+0x1cf/0x788
[ 444.890150] The buggy address belongs to the object at ffff8801542ad0a8
which belongs to the cache kmalloc-1024 of size 1024
[ 444.893597] The buggy address is located 296 bytes inside of
1024-byte region [ffff8801542ad0a8, ffff8801542ad4a8)
[ 444.897004] The buggy address belongs to the page:
[ 444.898486] page:ffffea000550aa00 count:1 mapcount:0
mapping:ffff88015a40ea40 index:0xffff8801542a8568 compound_mapcount: 0
[ 444.901682] flags: 0x8000000000008100(slab|head)
[ 444.903299] raw: 8000000000008100 ffffea00055c3e08 ffffea00055a3e08
ffff88015a40ea40
[ 444.905207] raw: ffff8801542a8568 0000000000170014 00000001ffffffff
0000000000000000
[ 444.907218] page dumped because: kasan: bad access detected
[ 444.910036] Memory state around the buggy address:
[ 444.911771] ffff8801542ad080: fc fc fc fc fc fb fb fb fb fb fb fb fb fb fb
fb
[ 444.913922] ffff8801542ad100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
fb
[ 444.915898] >ffff8801542ad180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
fb
[ 444.917769] ^
[ 444.919606] ffff8801542ad200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
fb
[ 444.921517] ffff8801542ad280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
fb
[ 444.923485]
==================================================================
[ 444.925350] Disabling lock debugging due to kernel taint
>
>Also I found another issue - if the device being deleted is a seed
>device as in btrfs/164, we don't have to call
>btrfs_update_commit_device_size() as because we don't write its super.
>But this isn't related to this commit nor the GPF that you saw.
>
>Thanks, Anand
>
>
>
>> [ 212.036659] Code: ef e8 60 cc 72 e1 49 8b 96 08 01 00 00 48 8b 0a 48 8d
>> 82 d8 fe ff ff 48 8d b1 d8 fe ff ff 49 39 d4 74 47 48 8b b8 30 01 00 00 <48>
>> 89 79 08 48 89 0f 48 89 90 28 01 00 00 48 89 90 30 01 00 00 48
>> [ 212.052862] RSP: 0018:ffffc90000c3bbc0 EFLAGS: 00010202
>> [ 212.057537] RAX: ffff88004d45ea88 RBX: ffff88005f246820 RCX:
>> 6b6b6b6b6b6b6b6b
>> [ 212.066491] RDX: ffff88004d45ebb0 RSI: 6b6b6b6b6b6b6a43 RDI:
>> 6b6b6b6b6b6b6b6b
>> [ 212.072735] RBP: ffffc90000c3bbe0 R08: 0000000000000000 R09:
>> 0000000000000001
>> [ 212.078961] R10: ffffc90000c3bbb0 R11: ffffffff82ea2800 R12:
>> ffff88005f2468d0
>> [ 212.084967] R13: ffff880066e4c910 R14: ffff88005f2467c8 R15:
>> ffff880066e4d138
>> [ 212.093457] FS: 00007fca3f6e08c0(0000) GS:ffff88007f800000(0000)
>> knlGS:0000000000000000
>> [ 212.099305] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> [ 212.103643] CR2: 00007fdd21385f88 CR3: 0000000075c4e000 CR4:
>> 00000000000006e0
>> [ 212.108514] Call Trace:
>> [ 212.110829] btrfs_commit_transaction+0x525/0x980 [btrfs]
>> [ 212.114745] btrfs_rm_device+0x527/0x560 [btrfs]
>> [ 212.118082] btrfs_ioctl+0x2e99/0x31e0 [btrfs]
>> [ 212.123417] ? __lock_acquire+0x396/0x1910
>> [ 212.126360] ? __might_fault+0x3e/0x90
>> [ 212.128924] ? __might_fault+0x85/0x90
>> [ 212.131398] ? _copy_to_user+0x65/0x80
>> [ 212.133870] ? cp_new_stat+0x120/0x150
>> [ 212.136354] ? native_sched_clock+0x3e/0xa0
>> [ 212.138825] do_vfs_ioctl+0xa9/0x6c0
>> [ 212.141175] ? btrfs_ioctl_get_supported_features+0x30/0x30 [btrfs]
>> [ 212.144476] ? do_vfs_ioctl+0xa9/0x6c0
>> [ 212.146889] ? trace_hardirqs_on+0xd/0x10
>> [ 212.149210] ksys_ioctl+0x67/0x90
>> [ 212.151499] __x64_sys_ioctl+0x1a/0x20
>> [ 212.154064] do_syscall_64+0x6d/0x690
>> [ 212.156146] ? trace_hardirqs_off_thunk+0x1a/0x1c
>> [ 212.158720] entry_SYSCALL_64_after_hwframe+0x49/0xbe
>> [ 212.161363] RIP: 0033:0x7fca3e4c1667
>> [ 212.163437] Code: 00 00 90 48 8b 05 e9 67 2c 00 64 c7 00 26 00 00 00 48
>> c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48>
>> 3d 01 f0 ff ff 73 01 c3 48 8b 0d b9 67 2c 00 f7 d8 64 89 01 48
>> [ 212.172921] RSP: 002b:00007ffffaf1ba08 EFLAGS: 00000202 ORIG_RAX:
>> 0000000000000010
>> [ 212.176599] RAX: ffffffffffffffda RBX: 00007ffffaf1dbd0 RCX:
>> 00007fca3e4c1667
>> [ 212.179912] RDX: 00007ffffaf1ca30 RSI: 000000005000943a RDI:
>> 0000000000000003
>> [ 212.184742] RBP: 0000000000000000 R08: 0000000000000000 R09:
>> 0000000000000000
>> [ 212.188250] R10: fffffffffffff807 R11: 0000000000000202 R12:
>> 00007ffffaf1dbd0
>> [ 212.191810] R13: 0000000000000000 R14: 0000000000000003 R15:
>> 00007ffffaf1dbd8
>> [ 212.195309] Modules linked in: btrfs(O) xor zstd_decompress zstd_compress
>> xxhash raid6_pq efivarfs xfs virtio_scsi [last unloaded: xor]
>> [ 212.201294] ---[ end trace d9007c0cfa00d04e ]---
>> [ 212.203760] RIP: 0010:btrfs_update_commit_device_size+0x74/0xd0 [btrfs]
>> [ 212.207008] Code: ef e8 60 cc 72 e1 49 8b 96 08 01 00 00 48 8b 0a 48 8d
>> 82 d8 fe ff ff 48 8d b1 d8 fe ff ff 49 39 d4 74 47 48 8b b8 30 01 00 00 <48>
>> 89 79 08 48 89 0f 48 89 90 28 01 00 00 48 89 90 30 01 00 00 48
>> [ 212.221356] RSP: 0018:ffffc90000c3bbc0 EFLAGS: 00010202
>> [ 212.224982] RAX: ffff88004d45ea88 RBX: ffff88005f246820 RCX:
>> 6b6b6b6b6b6b6b6b
>> [ 212.229116] RDX: ffff88004d45ebb0 RSI: 6b6b6b6b6b6b6a43 RDI:
>> 6b6b6b6b6b6b6b6b
>> [ 212.233170] RBP: ffffc90000c3bbe0 R08: 0000000000000000 R09:
>> 0000000000000001
>> [ 212.237057] R10: ffffc90000c3bbb0 R11: ffffffff82ea2800 R12:
>> ffff88005f2468d0
>> [ 212.240578] R13: ffff880066e4c910 R14: ffff88005f2467c8 R15:
>> ffff880066e4d138
>> [ 212.244531] FS: 00007fca3f6e08c0(0000) GS:ffff88007f800000(0000)
>> knlGS:0000000000000000
>> [ 212.249183] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> [ 212.252270] CR2: 00007fdd21385f88 CR3: 0000000075c4e000 CR4:
>> 00000000000006e0
>> [ 513.015417] kworker/dying (7) used greatest stack depth: 10056 bytes left
>>
>
>
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