* [BUG] block: bdi_register_owner() failure cause NULL pointer dereference
@ 2016-09-29 13:03 Michael Wang
0 siblings, 0 replies; only message in thread
From: Michael Wang @ 2016-09-29 13:03 UTC (permalink / raw)
To: linux-block, linux-kernel, axboe
[-- Attachment #1: Type: text/plain, Size: 1316 bytes --]
Hi, Folks
We observed the hard lockup while trying raid assemble with sas3ircu,
it was start with the failure inside bdi_register_owner() with duplicated
kobj path, and later comeup the NULL pointer dereference, after that system
hang and we saw hard lockup on screen.
The duplicated issue could be with the scsi controller driver and we are
going to upgrade it anyway, but my question is why we don't do some error
handling like:
diff --git a/block/genhd.c b/block/genhd.c
index a178c8e..318bc63 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -614,7 +614,15 @@ void device_add_disk(struct device *parent, struct gendisk *disk)
/* Register BDI before referencing it from bdev */
bdi = &disk->queue->backing_dev_info;
- bdi_register_owner(bdi, disk_to_dev(disk));
+ if (bdi_register_owner(bdi, disk_to_dev(disk))) {
+ disk_release_events(disk);
+ blk_free_devt(devt);
+ disk->ev = NULL;
+ disk->first_minor = 0;
+ disk->major = 0;
+ WARN_ON(1);
+ return;
+ }
blk_register_region(disk_devt(disk), disk->minors, NULL,
exact_match, exact_lock, disk);
to prevent the following NULL pointer dereference and hard lockup?
Regards,
Michael Wang
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Sep 29 09:53:28 st401b-3 systemd[1]: Starting Update UTMP about System Runlevel Changes...
Sep 29 09:53:28 st401b-3 ntpd[4970]: Listen and drop on 1 v6wildcard :: UDP 123
Sep 29 09:53:28 st401b-3 ntpd[4970]: Listen normally on 2 lo 127.0.0.1 UDP 123
Sep 29 09:53:28 st401b-3 ntpd[4970]: Listen normally on 3 eth0 10.41.12.3 UDP 123
Sep 29 09:53:28 st401b-3 ntpd[4970]: Listen normally on 4 lo ::1 UDP 123
Sep 29 09:53:28 st401b-3 ntpd[4970]: Listen normally on 5 eth0 fe80::ec4:7aff:feab:6b0 UDP 123
Sep 29 09:53:28 st401b-3 ntpd[4970]: peers refreshed
Sep 29 09:53:28 st401b-3 ntpd[4970]: Listening on routing socket on fd #22 for interface updates
Sep 29 09:53:28 st401b-3 systemd[1]: Started Update UTMP about System Runlevel Changes.
Sep 29 09:53:28 st401b-3 systemd[1]: Startup finished in 18.720s (kernel) + 39.513s (userspace) = 58.233s.
Sep 29 09:55:01 st401b-3 CRON[5433]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
Sep 29 09:55:01 st401b-3 CRON[5434]: (root) CMD (test -x /opt/profitbricks/bin/check_memory && /opt/profitbricks/bin/check_memory)
Sep 29 09:55:17 st401b-3 kernel: [ 167.693658] scsi 0:1:0:0: Direct-Access LSI Logical Volume 3000 PQ: 0 ANSI: 6
Sep 29 09:55:17 st401b-3 kernel: [ 167.693795] scsi 0:1:0:0: RAID1: handle(0x0143), wwid(0x02f7ec7949091b05), pd_count(2), type(SSP)
Sep 29 09:55:17 st401b-3 kernel: [ 167.694042] sd 0:1:0:0: [sdam] 5859373056 512-byte logical blocks: (3.00 TB/2.73 TiB)
Sep 29 09:55:17 st401b-3 kernel: [ 167.694044] sd 0:1:0:0: [sdam] 4096-byte physical blocks
Sep 29 09:55:17 st401b-3 kernel: [ 167.694057] sd 0:1:0:0: Attached scsi generic sg40 type 0
Sep 29 09:55:17 st401b-3 kernel: [ 167.694129] sd 0:1:0:0: [sdam] Write Protect is off
Sep 29 09:55:17 st401b-3 kernel: [ 167.694131] sd 0:1:0:0: [sdam] Mode Sense: 03 00 00 08
Sep 29 09:55:17 st401b-3 kernel: [ 167.694166] sd 0:1:0:0: [sdam] No Caching mode page found
Sep 29 09:55:17 st401b-3 kernel: [ 167.694282] sd 0:0:4:0: hidding raid component
Sep 29 09:55:17 st401b-3 kernel: [ 167.694589] sd 0:1:0:0: [sdam] Assuming drive cache: write through
Sep 29 09:55:17 st401b-3 kernel: [ 167.703346] sd 0:1:0:0: [sdam] Attached SCSI disk
Sep 29 09:55:17 st401b-3 kernel: [ 167.703653] sd 0:0:5:0: hidding raid component
Sep 29 09:55:39 st401b-3 check_backup_lvm_push: critical: local git command rev-parse HEAD failed, retval: 0, fatal: Not a git repository: '/var/lib/backup-lvm/.git/'
Sep 29 09:56:03 st401b-3 kernel: [ 213.684812] scsi 0:1:1:0: Direct-Access LSI Logical Volume 3000 PQ: 0 ANSI: 6
Sep 29 09:56:03 st401b-3 kernel: [ 213.684946] scsi 0:1:1:0: RAID1: handle(0x0142), wwid(0x0ab3eca651cd1b58), pd_count(2), type(SSP)
Sep 29 09:56:03 st401b-3 kernel: [ 213.685189] sd 0:1:1:0: [sde] 5859373056 512-byte logical blocks: (3.00 TB/2.73 TiB)
Sep 29 09:56:03 st401b-3 kernel: [ 213.685192] sd 0:1:1:0: [sde] 4096-byte physical blocks
Sep 29 09:56:03 st401b-3 kernel: [ 213.685204] sd 0:1:1:0: Attached scsi generic sg41 type 0
Sep 29 09:56:03 st401b-3 kernel: [ 213.685275] sd 0:1:1:0: [sde] Write Protect is off
Sep 29 09:56:03 st401b-3 kernel: [ 213.685277] sd 0:1:1:0: [sde] Mode Sense: 03 00 00 08
Sep 29 09:56:03 st401b-3 kernel: [ 213.685307] sd 0:1:1:0: [sde] No Caching mode page found
Sep 29 09:56:03 st401b-3 kernel: [ 213.685423] sd 0:0:6:0: hidding raid component
Sep 29 09:56:03 st401b-3 kernel: [ 213.685698] sd 0:1:1:0: [sde] Assuming drive cache: write through
Sep 29 09:56:03 st401b-3 kernel: [ 213.686226] ------------[ cut here ]------------
Sep 29 09:56:03 st401b-3 kernel: [ 213.686232] WARNING: CPU: 2 PID: 2061 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x64/0x80()
Sep 29 09:56:03 st401b-3 kernel: [ 213.686233] sysfs: cannot create duplicate filename '/devices/virtual/bdi/8:64'
Sep 29 09:56:03 st401b-3 kernel: [ 213.686234] Modules linked in: ipmi_devintf rdma_ucm ib_ucm rdma_cm iw_cm ib_uverbs mlx5_ib mlx5_core x86_pkg_temp_thermal crct10dif_pclmul crc32_pclmul sha256_ssse3 sha256_generic hmac drbg ansi_cprng ib_ipoib aesni_intel sb_edac aes_x86_64 glue_helper ablk_helper ib_cm cryptd edac_core i2c_i801 ioatdma ipmi_si ipmi_msghandler acpi_power_meter acpi_pad button mlx4_ib ib_sa ib_umad ib_mad ib_core ib_addr ipv6 hid_generic usbhid crc32c_intel igb xhci_pci ehci_pci hwmon ahci ehci_hcd xhci_hcd i2c_algo_bit libahci i2c_core mlx4_core dca mlx_compat sg
Sep 29 09:56:03 st401b-3 kernel: [ 213.686264] CPU: 2 PID: 2061 Comm: kworker/u32:33 Not tainted 4.4.21-1-storage #1
Sep 29 09:56:03 st401b-3 kernel: [ 213.686266] Hardware name: Supermicro SSG-5048R-E1CR36L/X10SRH-CLN4F, BIOS 2.0 12/17/2015
Sep 29 09:56:03 st401b-3 kernel: [ 213.686270] Workqueue: events_unbound async_run_entry_fn
Sep 29 09:56:03 st401b-3 kernel: [ 213.686272] 0000000000000000 ffff881034863a88 ffffffff812f27c8 ffff881034863ad0
Sep 29 09:56:03 st401b-3 kernel: [ 213.686274] ffffffff818090f7 ffff881034863ac0 ffffffff81055e26 ffff88103801b000
Sep 29 09:56:03 st401b-3 kernel: [ 213.686276] ffff8810387f1468 ffff8810381ff528 ffff881034884200 0000000000000000
Sep 29 09:56:03 st401b-3 kernel: [ 213.686278] Call Trace:
Sep 29 09:56:03 st401b-3 kernel: [ 213.686284] [<ffffffff812f27c8>] dump_stack+0x4d/0x65
Sep 29 09:56:03 st401b-3 kernel: [ 213.686289] [<ffffffff81055e26>] warn_slowpath_common+0x86/0xc0
Sep 29 09:56:03 st401b-3 kernel: [ 213.686291] [<ffffffff81055eac>] warn_slowpath_fmt+0x4c/0x50
Sep 29 09:56:03 st401b-3 kernel: [ 213.686296] [<ffffffff81206518>] ? kernfs_path+0x48/0x60
Sep 29 09:56:03 st401b-3 kernel: [ 213.686298] [<ffffffff81209a54>] sysfs_warn_dup+0x64/0x80
Sep 29 09:56:03 st401b-3 kernel: [ 213.686300] [<ffffffff81209b37>] sysfs_create_dir_ns+0x77/0x90
Sep 29 09:56:03 st401b-3 kernel: [ 213.686302] [<ffffffff812f5321>] kobject_add_internal+0xb1/0x340
Sep 29 09:56:03 st401b-3 kernel: [ 213.686305] [<ffffffff812fc9c7>] ? vsnprintf+0x347/0x510
Sep 29 09:56:03 st401b-3 kernel: [ 213.686307] [<ffffffff812f57a8>] kobject_add+0x68/0xb0
Sep 29 09:56:03 st401b-3 kernel: [ 213.686311] [<ffffffff813d7fc3>] ? device_private_init+0x23/0x70
Sep 29 09:56:03 st401b-3 kernel: [ 213.686315] [<ffffffff815acd92>] ? mutex_lock+0x12/0x30
Sep 29 09:56:03 st401b-3 kernel: [ 213.686317] [<ffffffff813d8276>] device_add+0x266/0x640
Sep 29 09:56:03 st401b-3 kernel: [ 213.686319] [<ffffffff8113fce2>] ? kfree_const+0x22/0x30
Sep 29 09:56:03 st401b-3 kernel: [ 213.686321] [<ffffffff813d8840>] device_create_groups_vargs+0xe0/0xf0
Sep 29 09:56:03 st401b-3 kernel: [ 213.686323] [<ffffffff813d886c>] device_create_vargs+0x1c/0x20
Sep 29 09:56:03 st401b-3 kernel: [ 213.686326] [<ffffffff811421f8>] bdi_register+0x68/0x160
Sep 29 09:56:03 st401b-3 kernel: [ 213.686328] [<ffffffff81142598>] bdi_register_owner+0x38/0x60
Sep 29 09:56:03 st401b-3 kernel: [ 213.686331] [<ffffffff812de10d>] add_disk+0x15d/0x470
Sep 29 09:56:03 st401b-3 kernel: [ 213.686333] [<ffffffff81444647>] sd_probe_async+0x107/0x1b0
Sep 29 09:56:03 st401b-3 kernel: [ 213.686336] [<ffffffff81073cd8>] async_run_entry_fn+0x48/0x150
Sep 29 09:56:03 st401b-3 kernel: [ 213.686340] [<ffffffff8106bf6d>] process_one_work+0x14d/0x410
Sep 29 09:56:03 st401b-3 kernel: [ 213.686342] [<ffffffff8106c576>] worker_thread+0x66/0x460
Sep 29 09:56:03 st401b-3 kernel: [ 213.686344] [<ffffffff8106c510>] ? rescuer_thread+0x2e0/0x2e0
Sep 29 09:56:03 st401b-3 kernel: [ 213.686346] [<ffffffff8107153b>] kthread+0xdb/0x100
Sep 29 09:56:03 st401b-3 kernel: [ 213.686348] [<ffffffff81071460>] ? kthread_park+0x60/0x60
Sep 29 09:56:03 st401b-3 kernel: [ 213.686350] [<ffffffff815af1df>] ret_from_fork+0x3f/0x70
Sep 29 09:56:03 st401b-3 kernel: [ 213.686352] [<ffffffff81071460>] ? kthread_park+0x60/0x60
Sep 29 09:56:03 st401b-3 kernel: [ 213.686353] ---[ end trace 652e67f80001ba41 ]---
Sep 29 09:56:03 st401b-3 kernel: [ 213.686354] ------------[ cut here ]------------
Sep 29 09:56:03 st401b-3 kernel: [ 213.686356] WARNING: CPU: 2 PID: 2061 at lib/kobject.c:240 kobject_add_internal+0x2cd/0x340()
Sep 29 09:56:03 st401b-3 kernel: [ 213.686357] kobject_add_internal failed for 8:64 with -EEXIST, don't try to register things with the same name in the same directory.
Sep 29 09:56:03 st401b-3 kernel: [ 213.686358] Modules linked in: ipmi_devintf rdma_ucm ib_ucm rdma_cm iw_cm ib_uverbs mlx5_ib mlx5_core x86_pkg_temp_thermal crct10dif_pclmul crc32_pclmul sha256_ssse3 sha256_generic hmac drbg ansi_cprng ib_ipoib aesni_intel sb_edac aes_x86_64 glue_helper ablk_helper ib_cm cryptd edac_core i2c_i801 ioatdma ipmi_si ipmi_msghandler acpi_power_meter acpi_pad button mlx4_ib ib_sa ib_umad ib_mad ib_core ib_addr ipv6 hid_generic usbhid crc32c_intel igb xhci_pci ehci_pci hwmon ahci ehci_hcd xhci_hcd i2c_algo_bit libahci i2c_core mlx4_core dca mlx_compat sg
Sep 29 09:56:03 st401b-3 kernel: [ 213.686376] CPU: 2 PID: 2061 Comm: kworker/u32:33 Tainted: G W 4.4.21-1-storage #1
Sep 29 09:56:03 st401b-3 kernel: [ 213.686377] Hardware name: Supermicro SSG-5048R-E1CR36L/X10SRH-CLN4F, BIOS 2.0 12/17/2015
Sep 29 09:56:03 st401b-3 kernel: [ 213.686379] Workqueue: events_unbound async_run_entry_fn
Sep 29 09:56:03 st401b-3 kernel: [ 213.686380] 0000000000000000 ffff881034863ad8 ffffffff812f27c8 ffff881034863b20
Sep 29 09:56:03 st401b-3 kernel: [ 213.686381] ffffffff8181a888 ffff881034863b10 ffffffff81055e26 ffff881034884210
Sep 29 09:56:03 st401b-3 kernel: [ 213.686383] 00000000ffffffef ffff881038200120 ffff881034884200 0000000000000000
Sep 29 09:56:03 st401b-3 kernel: [ 213.686385] Call Trace:
Sep 29 09:56:03 st401b-3 kernel: [ 213.686387] [<ffffffff812f27c8>] dump_stack+0x4d/0x65
Sep 29 09:56:03 st401b-3 kernel: [ 213.686389] [<ffffffff81055e26>] warn_slowpath_common+0x86/0xc0
Sep 29 09:56:03 st401b-3 kernel: [ 213.686391] [<ffffffff81055eac>] warn_slowpath_fmt+0x4c/0x50
Sep 29 09:56:03 st401b-3 kernel: [ 213.686393] [<ffffffff812f553d>] kobject_add_internal+0x2cd/0x340
Sep 29 09:56:03 st401b-3 kernel: [ 213.686395] [<ffffffff812fc9c7>] ? vsnprintf+0x347/0x510
Sep 29 09:56:03 st401b-3 kernel: [ 213.686396] [<ffffffff812f57a8>] kobject_add+0x68/0xb0
Sep 29 09:56:03 st401b-3 kernel: [ 213.686398] [<ffffffff813d7fc3>] ? device_private_init+0x23/0x70
Sep 29 09:56:03 st401b-3 kernel: [ 213.686399] [<ffffffff815acd92>] ? mutex_lock+0x12/0x30
Sep 29 09:56:03 st401b-3 kernel: [ 213.686401] [<ffffffff813d8276>] device_add+0x266/0x640
Sep 29 09:56:03 st401b-3 kernel: [ 213.686402] [<ffffffff8113fce2>] ? kfree_const+0x22/0x30
Sep 29 09:56:03 st401b-3 kernel: [ 213.686404] [<ffffffff813d8840>] device_create_groups_vargs+0xe0/0xf0
Sep 29 09:56:03 st401b-3 kernel: [ 213.686406] [<ffffffff813d886c>] device_create_vargs+0x1c/0x20
Sep 29 09:56:03 st401b-3 kernel: [ 213.686407] [<ffffffff811421f8>] bdi_register+0x68/0x160
Sep 29 09:56:03 st401b-3 kernel: [ 213.686409] [<ffffffff81142598>] bdi_register_owner+0x38/0x60
Sep 29 09:56:03 st401b-3 kernel: [ 213.686411] [<ffffffff812de10d>] add_disk+0x15d/0x470
Sep 29 09:56:03 st401b-3 kernel: [ 213.686412] [<ffffffff81444647>] sd_probe_async+0x107/0x1b0
Sep 29 09:56:03 st401b-3 kernel: [ 213.686414] [<ffffffff81073cd8>] async_run_entry_fn+0x48/0x150
Sep 29 09:56:03 st401b-3 kernel: [ 213.686416] [<ffffffff8106bf6d>] process_one_work+0x14d/0x410
Sep 29 09:56:03 st401b-3 kernel: [ 213.686418] [<ffffffff8106c576>] worker_thread+0x66/0x460
Sep 29 09:56:03 st401b-3 kernel: [ 213.686420] [<ffffffff8106c510>] ? rescuer_thread+0x2e0/0x2e0
Sep 29 09:56:03 st401b-3 kernel: [ 213.686422] [<ffffffff8107153b>] kthread+0xdb/0x100
Sep 29 09:56:03 st401b-3 kernel: [ 213.686423] [<ffffffff81071460>] ? kthread_park+0x60/0x60
Sep 29 09:56:03 st401b-3 kernel: [ 213.686425] [<ffffffff815af1df>] ret_from_fork+0x3f/0x70
Sep 29 09:56:03 st401b-3 kernel: [ 213.686427] [<ffffffff81071460>] ? kthread_park+0x60/0x60
Sep 29 09:56:03 st401b-3 kernel: [ 213.686428] ---[ end trace 652e67f80001ba42 ]---
Sep 29 09:56:03 st401b-3 kernel: [ 213.705961] BUG: unable to handle kernel NULL pointer dereference at 0000000000000040
Sep 29 09:56:03 st401b-3 kernel: [ 213.706601] IP: [<ffffffff81209d74>] sysfs_do_create_link_sd.isra.2+0x34/0xb0
Sep 29 09:56:03 st401b-3 kernel: [ 213.707154] PGD 0
Sep 29 09:56:03 st401b-3 kernel: [ 213.707325] Oops: 0000 [#1] SMP
Sep 29 09:56:03 st401b-3 kernel: [ 213.707588] Modules linked in: ipmi_devintf rdma_ucm ib_ucm rdma_cm iw_cm ib_uverbs mlx5_ib mlx5_core x86_pkg_temp_thermal crct10dif_pclmul crc32_pclmul sha256_ssse3 sha256_generic hmac drbg ansi_cprng ib_ipoib aesni_intel sb_edac aes_x86_64 glue_helper ablk_helper ib_cm cryptd edac_core i2c_i801 ioatdma ipmi_si ipmi_msghandler acpi_power_meter acpi_pad button mlx4_ib ib_sa ib_umad ib_mad ib_core ib_addr ipv6 hid_generic usbhid crc32c_intel igb xhci_pci ehci_pci hwmon ahci ehci_hcd xhci_hcd i2c_algo_bit libahci i2c_core mlx4_core dca mlx_compat sg
Sep 29 09:56:03 st401b-3 kernel: [ 213.711714] CPU: 2 PID: 2061 Comm: kworker/u32:33 Tainted: G W 4.4.21-1-storage #1
Sep 29 09:56:03 st401b-3 kernel: [ 213.712327] Hardware name: Supermicro SSG-5048R-E1CR36L/X10SRH-CLN4F, BIOS 2.0 12/17/2015
Sep 29 09:56:03 st401b-3 kernel: [ 213.713000] Workqueue: events_unbound async_run_entry_fn
Sep 29 09:56:03 st401b-3 kernel: [ 213.713385] task: ffff881034858000 ti: ffff881034860000 task.ti: ffff881034860000
Sep 29 09:56:03 st401b-3 kernel: [ 213.713922] RIP: 0010:[<ffffffff81209d74>] [<ffffffff81209d74>] sysfs_do_create_link_sd.isra.2+0x34/0xb0
Sep 29 09:56:03 st401b-3 kernel: [ 213.714650] RSP: 0018:ffff881034863d30 EFLAGS: 00010246
Sep 29 09:56:03 st401b-3 kernel: [ 213.715044] RAX: 0000000000000000 RBX: 0000000000000040 RCX: 0000000000000001
Sep 29 09:56:03 st401b-3 kernel: [ 213.715568] RDX: 0000000000000001 RSI: 0000000000000040 RDI: ffffffff81ec4c10
Sep 29 09:56:03 st401b-3 kernel: [ 213.716092] RBP: ffff881034863d58 R08: ffff8800738f6180 R09: ffff881036c0e288
Sep 29 09:56:03 st401b-3 kernel: [ 213.716616] R10: 0000000000000000 R11: 0000000000018be0 R12: 0000000000000001
Sep 29 09:56:03 st401b-3 kernel: [ 213.717139] R13: ffffffff817f5a5d R14: ffff881016c8c078 R15: ffff8810361d9a00
Sep 29 09:56:03 st401b-3 kernel: [ 213.717674] FS: 0000000000000000(0000) GS:ffff88107fc40000(0000) knlGS:0000000000000000
Sep 29 09:56:03 st401b-3 kernel: [ 213.718264] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Sep 29 09:56:03 st401b-3 kernel: [ 213.718690] CR2: 0000000000000040 CR3: 0000001038176000 CR4: 00000000003406e0
Sep 29 09:56:03 st401b-3 kernel: [ 213.719216] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Sep 29 09:56:03 st401b-3 kernel: [ 213.719741] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Sep 29 09:56:03 st401b-3 kernel: [ 213.720293] Stack:
Sep 29 09:56:03 st401b-3 kernel: [ 213.720447] ffff88103536bc00 ffff88103536bc80 ffff88103536bc0c ffff881033141150
Sep 29 09:56:03 st401b-3 kernel: [ 213.721030] ffff8810361d9a00 ffff881034863d68 ffffffff81209e15 ffff881034863dc8
Sep 29 09:56:03 st401b-3 kernel: [ 213.721601] ffffffff812de1a3 ffff88103536bc00 0080004033141150 ffff88103536bc00
Sep 29 09:56:03 st401b-3 kernel: [ 213.722197] Call Trace:
Sep 29 09:56:03 st401b-3 kernel: [ 213.722402] [<ffffffff81209e15>] sysfs_create_link+0x25/0x40
Sep 29 09:56:03 st401b-3 kernel: [ 213.722854] [<ffffffff812de1a3>] add_disk+0x1f3/0x470
Sep 29 09:56:03 st401b-3 kernel: [ 213.723236] [<ffffffff81444647>] sd_probe_async+0x107/0x1b0
Sep 29 09:56:03 st401b-3 kernel: [ 213.723636] [<ffffffff81073cd8>] async_run_entry_fn+0x48/0x150
Sep 29 09:56:03 st401b-3 kernel: [ 213.724053] [<ffffffff8106bf6d>] process_one_work+0x14d/0x410
Sep 29 09:56:03 st401b-3 kernel: [ 213.724464] [<ffffffff8106c576>] worker_thread+0x66/0x460
Sep 29 09:56:03 st401b-3 kernel: [ 213.724851] [<ffffffff8106c510>] ? rescuer_thread+0x2e0/0x2e0
Sep 29 09:56:03 st401b-3 kernel: [ 213.725262] [<ffffffff8107153b>] kthread+0xdb/0x100
Sep 29 09:56:03 st401b-3 kernel: [ 213.725612] [<ffffffff81071460>] ? kthread_park+0x60/0x60
Sep 29 09:56:03 st401b-3 kernel: [ 213.725999] [<ffffffff815af1df>] ret_from_fork+0x3f/0x70
Sep 29 09:56:03 st401b-3 kernel: [ 213.726379] [<ffffffff81071460>] ? kthread_park+0x60/0x60
Sep 29 09:56:03 st401b-3 kernel: [ 213.743800] Code: 75 48 85 ff 74 70 55 48 89 e5 41 57 41 56 41 55 41 54 49 89 fe 53 48 c7 c7 10 4c ec 81 48 89 f3 41 89 cc 49 89 d5 e8 dc 4d 3a 00 <48> 8b 1b 48 85 db 74 08 48 89 df e8 ac c7 ff ff c6 05 85 ae cb
Sep 29 09:56:03 st401b-3 kernel: [ 213.781305] RIP [<ffffffff81209d74>] sysfs_do_create_link_sd.isra.2+0x34/0xb0
Sep 29 09:56:03 st401b-3 kernel: [ 213.799760] RSP <ffff881034863d30>
Sep 29 09:56:03 st401b-3 kernel: [ 213.818354] CR2: 0000000000000040
Sep 29 09:56:03 st401b-3 kernel: [ 213.836356] ---[ end trace 652e67f80001ba43 ]---
Sep 29 09:56:03 st401b-3 kernel: [ 213.855513] BUG: unable to handle kernel paging request at ffffffffffffffd8
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2016-09-29 13:03 [BUG] block: bdi_register_owner() failure cause NULL pointer dereference Michael Wang
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