uas - kernel panic on drive connection

uas - kernel panic on drive connection

[Jonathan]

Beginning with kernel 3.15.1, I am getting hard lockups every time I connect a drive to my USB 3 HDD dock with ASMedia ASM1051E UASP compliant chipset. The only way I am able work around this is to set the quirk to ignore uas for the device. Here are the kernel messages during connection followed by a backtrace:

[  229.882190] usb 2-1: new SuperSpeed USB device number 3 using xhci_hcd
[  229.908001] usb-storage 2-1:1.0: USB Mass Storage device detected
[  229.908218] usb-storage 2-1:1.0: Quirks match for vid 174c pid 55aa: 400000
[  229.908349] scsi7 : usb-storage 2-1:1.0
[  230.912633] scsi 7:0:0:0: Direct-Access     ASMT     2105             0    PQ: 0 ANSI: 6
[  230.914818] sd 7:0:0:0: [sdc] Attached SCSI removable disk
[  289.680267] usb 2-1: USB disconnect, device number 3
[  319.599862] usb 2-1: new SuperSpeed USB device number 4 using xhci_hcd
[  319.626881] scsi8 : uas
[  319.628221] xhci_hcd 0000:02:00.0: ERROR Transfer event TRB DMA ptr not part of current TD
[  320.029323] BUG: unable to handle kernel paging request at 0000000001000003
[  320.029393] IP: [<ffffffff81198b0b>] kmem_cache_alloc+0x6b/0x170
[  320.029445] PGD 40821a067 PUD 401bbf067 PMD 40411c067 PTE 0
[  320.029505] Oops: 0000 [#1] PREEMPT SMP 
[  320.029552] Modules linked in: uas usb_storage netconsole des_generic ecb md4 nls_utf8 cifs dns_resolver sch_fq_codel fuse nf_conntrack_ipv4 nf_defrag_ipv4 xt_tcpudp xt_conntrack nf_conntrack iptable_filter ip_tables x_tables vmnet(O) vsock vmci(O) vmmon(O) w83627ehf hwmon_vid adm1021 xfs libcrc32c nls_iso8859_1 nls_cp437 vfat fat coretemp hwmon iTCO_wdt intel_rapl iTCO_vendor_support x86_pkg_temp_thermal intel_powerclamp crct10dif_pclmul crc32_pclmul ppdev crc32c_intel snd_hda_codec_hdmi ghash_clmulni_intel aesni_intel snd_hda_codec_realtek snd_hda_codec_generic aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd e1000e hdpvr microcode evdev snd_hda_intel i915 joydev v4l2_dv_timings ptp mousedev psmouse r8168(O) mac_hid snd_hda_controller videodev serio_raw pcspkr media snd_hda_code
 c i2c_i801 lpc_ich pps_core snd_hwdep drm_kms_helper snd_pcm snd_timer drm snd battery tpm_tis parport_pc tpm intel_gtt parport i2c_algo_bit mei_me soundcore mei nuvoton_cir video shpchp button processor nfsd auth_rpcgss oid_registry nfs_acl nfs lockd fscache sunrpc lirc_zilog(C) i2c_core lirc_dev rc_core ext4 crc16 mbcache jbd2 hid_generic usbhid hid sd_mod crc_t10dif crct10dif_common atkbd libps2 ehci_pci xhci_hcd ehci_hcd firewire_ohci ahci libahci libata firewire_core crc_itu_t scsi_mod usbcore usb_common i8042 serio
[  320.030938] CPU: 0 PID: 782 Comm: mysqld Tainted: G         C O  3.15.3-ARCH #1
[  320.030988] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./Z68 Pro3-M, BIOS P2.30 06/29/2012
[  320.031052] task: ffff8800c9488a30 ti: ffff8800cebd8000 task.ti: ffff8800cebd8000
[  320.031103] RIP: 0010:[<ffffffff81198b0b>]  [<ffffffff81198b0b>] kmem_cache_alloc+0x6b/0x170
[  320.031165] RSP: 0018:ffff8800cebdba78  EFLAGS: 00010082
[  320.031203] RAX: 0000000000000000 RBX: ffffffffa0118140 RCX: 0000000000833300
[  320.031251] RDX: 0000000000833280 RSI: 0000000000000020 RDI: ffffffffa00fd04b
[  320.031298] RBP: ffff8800cebdbaa8 R08: 0000000000017560 R09: ffff8803fad57380
[  320.031346] R10: 000000000000002f R11: ffff8803fad5002f R12: 0000000001000003
[  320.031394] R13: 0000000000000020 R14: ffff880407af1000 R15: ffff88040ec01900
[  320.031442] FS:  00007f28c2bff700(0000) GS:ffff88041f200000(0000) knlGS:0000000000000000
[  320.031496] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  320.031536] CR2: 0000000001000003 CR3: 0000000407474000 CR4: 00000000000407f0
[  320.031584] Stack:
[  320.031602]  ffffffffa00fd030 ffffffffa0118140 ffff8803fad57380 0000000000000020
[  320.031669]  ffff880407af1000 0000000000000020 ffff8800cebdbae0 ffffffffa00fd04b
[  320.031738]  ffff8803c8e93780 ffff880407af1000 ffff880407430968 000000000084f7e0
[  320.031806] Call Trace:
[  320.031839]  [<ffffffffa00fd030>] ? scsi_host_alloc_command+0x30/0xd0 [scsi_mod]
[  320.031899]  [<ffffffffa00fd04b>] scsi_host_alloc_command+0x4b/0xd0 [scsi_mod]
[  320.031956]  [<ffffffffa00fd0e8>] __scsi_get_command+0x18/0xe0 [scsi_mod]
[  320.032009]  [<ffffffffa00fd1cb>] scsi_get_command+0x1b/0xd0 [scsi_mod]
[  320.032064]  [<ffffffffa0104c74>] scsi_get_cmd_from_req+0x74/0xa0 [scsi_mod]
[  320.032121]  [<ffffffffa0105a2d>] scsi_setup_fs_cmnd+0x3d/0xb0 [scsi_mod]
[  320.032173]  [<ffffffffa0247c68>] sd_prep_fn+0x3b8/0xd30 [sd_mod]
[  320.032219]  [<ffffffff8126a411>] blk_peek_request+0x131/0x280
[  320.032268]  [<ffffffffa0105ade>] scsi_request_fn+0x3e/0x4b0 [scsi_mod]
[  320.032315]  [<ffffffff81266853>] __blk_run_queue+0x33/0x40
[  320.032356]  [<ffffffff81267afe>] queue_unplugged+0x2e/0xd0
[  320.032398]  [<ffffffff8126a8dd>] blk_flush_plug_list+0x1ed/0x270
[  320.032442]  [<ffffffff8126ad14>] blk_finish_plug+0x14/0x50
[  320.032491]  [<ffffffffa0303539>] ext4_writepages+0x449/0xd20 [ext4]
[  320.032539]  [<ffffffff8114d06e>] do_writepages+0x1e/0x30
[  320.032579]  [<ffffffff8114134d>] __filemap_fdatawrite_range+0x5d/0x80
[  320.032625]  [<ffffffff8114146a>] filemap_write_and_wait_range+0x2a/0x70
[  320.032680]  [<ffffffffa02fa790>] ext4_sync_file+0x110/0x370 [ext4]
[  320.032726]  [<ffffffff811e4e8e>] do_fsync+0x4e/0x80
[  320.032764]  [<ffffffff811e5140>] SyS_fsync+0x10/0x20
[  320.032804]  [<ffffffff81515ee9>] system_call_fastpath+0x16/0x1b
[  320.032846] Code: 0f 84 ca 00 00 00 4c 8b 20 4d 85 e4 0f 84 de 00 00 00 48 83 78 10 00 0f 84 d3 00 00 00 49 63 47 20 48 8d 8a 80 00 00 00 4d 8b 07 <49> 8b 1c 04 4c 89 e0 65 49 0f c7 08 0f 94 c0 84 c0 74 a2 49 63 
[  320.033293] RIP  [<ffffffff81198b0b>] kmem_cache_alloc+0x6b/0x170
[  320.033342]  RSP <ffff8800cebdba78>
[  320.033369] CR2: 0000000001000003
[  320.033396] ---[ end trace f435c843a04f8e94 ]---

Re: uas - kernel panic on drive connection

[Jonathan]

Hans, could you comment on this? Thanks.

Jonathan

Re: uas - kernel panic on drive connection

[Hans de Goede]

Hi, Jonathan

Fri, 04 Jul 2014, Jonathan wrote:

> Beginning with kernel 3.15.1, I am getting hard lockups every time I connect a
> drive to my USB 3 HDD dock with ASMedia ASM1051E UASP compliant chipset. The
> only way I am able work around this is to set the quirk to ignore uas for the
> device. Here are the kernel messages during connection followed by a backtrace:
>
> [  229.882190] usb 2-1: new SuperSpeed USB device number 3 using xhci_hcd
> [  229.908001] usb-storage 2-1:1.0: USB Mass Storage device detected
> [  229.908218] usb-storage 2-1:1.0: Quirks match for vid 174c pid 55aa: 400000
> [  229.908349] scsi7 : usb-storage 2-1:1.0
> [  230.912633] scsi 7:0:0:0: Direct-Access     ASMT     2105             0     PQ: 0 ANSI: 6
> [  230.914818] sd 7:0:0:0: [sdc] Attached SCSI removable disk
> [  289.680267] usb 2-1: USB disconnect, device number 3
> [  319.599862] usb 2-1: new SuperSpeed USB device number 4 using xhci_hcd
> [  319.626881] scsi8 : uas
> [  319.628221] xhci_hcd 0000:02:00.0: ERROR Transfer event TRB DMA ptr not part  of current TD
> [  320.029323] BUG: unable to handle kernel paging request at 0000000001000003

This looks like something is going wrong in the XHCI code, likely something
related to bulk-streams.

I've a dock with an ASMedia ASM1053E chipset myself and that one works fine with both
Nec and Intel XHCI controllers. What type of XHCI controller do you have ?

Can you please do "lspci" on the machine in question and include the output in your
next mail ?

Regards,

Hans

Re: uas - kernel panic on drive connection

[Jonathan]

Hans,

Thanks for getting back to me. It looks like the USB 3.0 controller is an Etron.

Here is the output from lspci:

00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor Family DRAM Controller (rev 09)
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
00:16.0 Communication controller: Intel Corporation 6 Series/C200 Series Chipset Family MEI Controller #1 (rev 04)
00:1a.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #2 (rev 05)
00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller (rev 05)
00:1c.0 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 1 (rev b5)
00:1c.2 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 3 (rev b5)
00:1c.4 PCI bridge: Intel Corporation 82801 PCI Bridge (rev b5)
00:1c.5 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 6 (rev b5)
00:1d.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #1 (rev 05)
00:1f.0 ISA bridge: Intel Corporation Z68 Express Chipset Family LPC Controller (rev 05)
00:1f.2 SATA controller: Intel Corporation 6 Series/C200 Series Chipset Family SATA AHCI Controller (rev 05)
00:1f.3 SMBus: Intel Corporation 6 Series/C200 Series Chipset Family SMBus Controller (rev 05)
01:00.0 Ethernet controller: Intel Corporation 82574L Gigabit Network Connection
02:00.0 USB controller: Etron Technology, Inc. EJ168 USB 3.0 Host Controller (rev 01)
03:00.0 PCI bridge: ASMedia Technology Inc. ASM1083/1085 PCIe to PCI Bridge (rev 01)
04:00.0 FireWire (IEEE 1394): Texas Instruments TSB12LV26 IEEE-1394 Controller (Link)
05:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 06)

Best,

Jonathan

On Wed, 09 Jul 2014 09:06:43 +0200
Hans de Goede <hdegoede@redhat.com> wrote:

> 
> This looks like something is going wrong in the XHCI code, likely something
> related to bulk-streams.
> 
> I've a dock with an ASMedia ASM1053E chipset myself and that one works fine with both
> Nec and Intel XHCI controllers. What type of XHCI controller do you have ?
> 
> Can you please do "lspci" on the machine in question and include the output in your
> next mail ?
> 
> Regards,
> 
> Hans

Re: uas - kernel panic on drive connection

[Hans de Goede]

Hi,

On 07/10/2014 01:31 AM, Jonathan wrote:
> Hans,
> 
> Thanks for getting back to me. It looks like the USB 3.0 controller is an Etron.

Etron, that is the first time I've heard of them. So that is the 5th manufacturer
which is making xhci controllers now (the others are nec, intel, via and designware).

I've managed to find a pci-e add-on card using the same Etron chipset as you have,
and I've ordered one, so that I can try and reproduce this problem. It will be
aprox. 3 weeks before I get it though.

In the mean time, can you try the usb disk enclosure on a machine with a nec or
intel xhci controller ? So that we can confirm that this is indeed a problem
specific to the Etron controller?

Regards,

Hans


> 
> Here is the output from lspci:
> 
> 00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor Family DRAM Controller (rev 09)
> 00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
> 00:16.0 Communication controller: Intel Corporation 6 Series/C200 Series Chipset Family MEI Controller #1 (rev 04)
> 00:1a.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #2 (rev 05)
> 00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller (rev 05)
> 00:1c.0 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 1 (rev b5)
> 00:1c.2 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 3 (rev b5)
> 00:1c.4 PCI bridge: Intel Corporation 82801 PCI Bridge (rev b5)
> 00:1c.5 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 6 (rev b5)
> 00:1d.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #1 (rev 05)
> 00:1f.0 ISA bridge: Intel Corporation Z68 Express Chipset Family LPC Controller (rev 05)
> 00:1f.2 SATA controller: Intel Corporation 6 Series/C200 Series Chipset Family SATA AHCI Controller (rev 05)
> 00:1f.3 SMBus: Intel Corporation 6 Series/C200 Series Chipset Family SMBus Controller (rev 05)
> 01:00.0 Ethernet controller: Intel Corporation 82574L Gigabit Network Connection
> 02:00.0 USB controller: Etron Technology, Inc. EJ168 USB 3.0 Host Controller (rev 01)
> 03:00.0 PCI bridge: ASMedia Technology Inc. ASM1083/1085 PCIe to PCI Bridge (rev 01)
> 04:00.0 FireWire (IEEE 1394): Texas Instruments TSB12LV26 IEEE-1394 Controller (Link)
> 05:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 06)
> 
> Best,
> 
> Jonathan
> 
> On Wed, 09 Jul 2014 09:06:43 +0200
> Hans de Goede <hdegoede@redhat.com> wrote:
> 
>>
>> This looks like something is going wrong in the XHCI code, likely something
>> related to bulk-streams.
>>
>> I've a dock with an ASMedia ASM1053E chipset myself and that one works fine with both
>> Nec and Intel XHCI controllers. What type of XHCI controller do you have ?
>>
>> Can you please do "lspci" on the machine in question and include the output in your
>> next mail ?
>>
>> Regards,
>>
>> Hans

Re: uas - kernel panic on drive connection

[Jonathan]

Hans,

Sure enough, the enclosure worked flawlessly with uas on a machine with an Intel xhci controller (2012 MacBook Air running Linux with kernel 3.15.3). I  look forward to learning your results with the Etron controller.

Best,

Jonathan

On Fri, 11 Jul 2014 11:36:28 +0200
Hans de Goede <hdegoede@redhat.com> wrote:

> Etron, that is the first time I've heard of them. So that is the 5th manufacturer
> which is making xhci controllers now (the others are nec, intel, via and designware).
> 
> I've managed to find a pci-e add-on card using the same Etron chipset as you have,
> and I've ordered one, so that I can try and reproduce this problem. It will be
> aprox. 3 weeks before I get it though.
> 
> In the mean time, can you try the usb disk enclosure on a machine with a nec or
> intel xhci controller ? So that we can confirm that this is indeed a problem
> specific to the Etron controller?
> 
> Regards,
> 
> Hans

Re: uas - kernel panic on drive connection

[Hans de Goede]

Hi,

On 07/12/2014 02:40 AM, Jonathan wrote:
> Hans,
>
> Sure enough, the enclosure worked flawlessly with uas on a machine with an Intel xhci controller (2012 MacBook Air running Linux with kernel 3.15.3). I  look forward to learning your results with the Etron controller.

Ok, that is good to hear. The best way forward then is probably
to disable bulk streams (and thus uas) on etron controllers for now.

Once I've my Etron controller I can try to fix this, and re-enable
streams on them if I succeed.

Can please file a bug at:

https://bugzilla.kernel.org/enter_bug.cgi?product=Drivers

Component USB and put jwrdegoede@fedoraproject.org in the CC?

Please include the output of these 2 commands in the bug report:

lsusb -v
lspci -nn

Also please include a remark that you are able to work around
this by using the quirk to use usb-storage unstead of uas.

Thanks,

Hans

uas - kernel panic on drive connection

[Jonathan]

Beginning with kernel 3.15.1, I am getting hard lockups every time I
connect a drive to my USB 3 HDD dock with ASMedia ASM1051E UASP
compliant chipset. The only way I am able work around this is to set
the quirk to ignore uas for the device. Here are the kernel messages
during connection followed by a backtrace:

[  229.882190] usb 2-1: new SuperSpeed USB device number 3 using
xhci_hcd [  229.908001] usb-storage 2-1:1.0: USB Mass Storage device
detected [  229.908218] usb-storage 2-1:1.0: Quirks match for vid 174c
pid 55aa: 400000 [  229.908349] scsi7 : usb-storage 2-1:1.0
[  230.912633] scsi 7:0:0:0: Direct-Access     ASMT
2105             0    PQ: 0 ANSI: 6 [  230.914818] sd 7:0:0:0: [sdc]
Attached SCSI removable disk [  289.680267] usb 2-1: USB disconnect,
device number 3 [  319.599862] usb 2-1: new SuperSpeed USB device
number 4 using xhci_hcd [  319.626881] scsi8 : uas
[  319.628221] xhci_hcd 0000:02:00.0: ERROR Transfer event TRB DMA ptr
not part of current TD [  320.029323] BUG: unable to handle kernel
paging request at 0000000001000003 [  320.029393] IP:
[<ffffffff81198b0b>] kmem_cache_alloc+0x6b/0x170 [  320.029445] PGD
40821a067 PUD 401bbf067 PMD 40411c067 PTE 0 [  320.029505] Oops: 0000
[#1] PREEMPT SMP [  320.029552] Modules linked in: uas usb_storage
netconsole des_generic ecb md4 nls_utf8 cifs dns_resolver sch_fq_codel
fuse nf_conntrack_ipv4 nf_defrag_ipv4 xt_tcpudp xt_conntrack
nf_conntrack iptable_filter ip_tables x_tables vmnet(O) vsock vmci(O)
vmmon(O) w83627ehf hwmon_vid adm1021 xfs libcrc32c nls_iso8859_1
nls_cp437 vfat fat coretemp hwmon iTCO_wdt intel_rapl
iTCO_vendor_support x86_pkg_temp_thermal intel_powerclamp
crct10dif_pclmul crc32_pclmul ppdev crc32c_intel snd_hda_codec_hdmi
ghash_clmulni_intel aesni_intel snd_hda_codec_realtek
snd_hda_codec_generic aes_x86_64 lrw gf128mul glue_helper ablk_helper
cryptd e1000e hdpvr microcode evdev snd_hda_intel i915 joydev
v4l2_dv_timings ptp mousedev psmouse r8168(O) mac_hid
snd_hda_controller videodev serio_raw pcspkr media snd_hda_codec
i2c_i801 lpc_ich pps_core snd_hwdep drm_kms_helper snd_pcm snd_timer
drm snd battery tpm_tis parport_pc tpm intel_gtt parport i2c_algo_bit
mei_me soundcore mei nuvoton_cir video shpchp button processor nfsd
auth_rpcgss oid_registry nfs_acl nfs lockd fscache sunrpc lirc_zilog(C)
i2c_core lirc_dev rc_core ext4 crc16 mbcache jbd2 hid_generic usbhid
hid sd_mod crc_t10dif crct10dif_common atkbd libps2 ehci_pci xhci_hcd
ehci_hcd firewire_ohci ahci libahci libata firewire_core crc_itu_t
scsi_mod usbcore usb_common i8042 serio [  320.030938] CPU: 0 PID: 782
Comm: mysqld Tainted: G         C O  3.15.3-ARCH #1 [  320.030988]
Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./Z68
Pro3-M, BIOS P2.30 06/29/2012 [  320.031052] task: ffff8800c9488a30 ti:
ffff8800cebd8000 task.ti: ffff8800cebd8000 [  320.031103] RIP:
0010:[<ffffffff81198b0b>]  [<ffffffff81198b0b>]
kmem_cache_alloc+0x6b/0x170 [  320.031165] RSP: 0018:ffff8800cebdba78
EFLAGS: 00010082 [  320.031203] RAX: 0000000000000000 RBX:
ffffffffa0118140 RCX: 0000000000833300 [  320.031251] RDX:
0000000000833280 RSI: 0000000000000020 RDI: ffffffffa00fd04b
[  320.031298] RBP: ffff8800cebdbaa8 R08: 0000000000017560 R09:
ffff8803fad57380 [  320.031346] R10: 000000000000002f R11:
ffff8803fad5002f R12: 0000000001000003 [  320.031394] R13:
0000000000000020 R14: ffff880407af1000 R15: ffff88040ec01900
[  320.031442] FS:  00007f28c2bff700(0000) GS:ffff88041f200000(0000)
knlGS:0000000000000000 [  320.031496] CS:  0010 DS: 0000 ES: 0000 CR0:
0000000080050033 [  320.031536] CR2: 0000000001000003 CR3:
0000000407474000 CR4: 00000000000407f0 [  320.031584] Stack:
[  320.031602]  ffffffffa00fd030 ffffffffa0118140 ffff8803fad57380
0000000000000020 [  320.031669]  ffff880407af1000 0000000000000020
ffff8800cebdbae0 ffffffffa00fd04b [  320.031738]  ffff8803c8e93780
ffff880407af1000 ffff880407430968 000000000084f7e0 [  320.031806] Call
Trace: [  320.031839]  [<ffffffffa00fd030>] ?
scsi_host_alloc_command+0x30/0xd0 [scsi_mod] [  320.031899]
[<ffffffffa00fd04b>] scsi_host_alloc_command+0x4b/0xd0 [scsi_mod]
[  320.031956]  [<ffffffffa00fd0e8>] __scsi_get_command+0x18/0xe0
[scsi_mod] [  320.032009]  [<ffffffffa00fd1cb>]
scsi_get_command+0x1b/0xd0 [scsi_mod] [  320.032064]
[<ffffffffa0104c74>] scsi_get_cmd_from_req+0x74/0xa0 [scsi_mod]
[  320.032121]  [<ffffffffa0105a2d>] scsi_setup_fs_cmnd+0x3d/0xb0
[scsi_mod] [  320.032173]  [<ffffffffa0247c68>] sd_prep_fn+0x3b8/0xd30
[sd_mod] [  320.032219]  [<ffffffff8126a411>]
blk_peek_request+0x131/0x280 [  320.032268]  [<ffffffffa0105ade>]
scsi_request_fn+0x3e/0x4b0 [scsi_mod] [  320.032315]
[<ffffffff81266853>] __blk_run_queue+0x33/0x40 [  320.032356]
[<ffffffff81267afe>] queue_unplugged+0x2e/0xd0 [  320.032398]
[<ffffffff8126a8dd>] blk_flush_plug_list+0x1ed/0x270 [  320.032442]
[<ffffffff8126ad14>] blk_finish_plug+0x14/0x50 [  320.032491]
[<ffffffffa0303539>] ext4_writepages+0x449/0xd20 [ext4] [  320.032539]
[<ffffffff8114d06e>] do_writepages+0x1e/0x30 [  320.032579]
[<ffffffff8114134d>] __filemap_fdatawrite_range+0x5d/0x80
[  320.032625]  [<ffffffff8114146a>]
filemap_write_and_wait_range+0x2a/0x70 [  320.032680]
[<ffffffffa02fa790>] ext4_sync_file+0x110/0x370 [ext4] [  320.032726]
[<ffffffff811e4e8e>] do_fsync+0x4e/0x80 [  320.032764]
[<ffffffff811e5140>] SyS_fsync+0x10/0x20 [  320.032804]
[<ffffffff81515ee9>] system_call_fastpath+0x16/0x1b [  320.032846]
Code: 0f 84 ca 00 00 00 4c 8b 20 4d 85 e4 0f 84 de 00 00 00 48 83 78 10
00 0f 84 d3 00 00 00 49 63 47 20 48 8d 8a 80 00 00 00 4d 8b 07 <49> 8b
1c 04 4c 89 e0 65 49 0f c7 08 0f 94 c0 84 c0 74 a2 49 63 [  320.033293]
RIP  [<ffffffff81198b0b>] kmem_cache_alloc+0x6b/0x170 [  320.033342]
RSP <ffff8800cebdba78> [  320.033369] CR2: 0000000001000003
[  320.033396] ---[ end trace f435c843a04f8e94 ]---