Message-ID: <CADaLNDk7NNqe=839ro7KnwpfRAOLO3evX=JL12bMZR8vm2xYMg@mail.gmail.com>
Date:	Wed, 12 Aug 2015 20:17:28 -0700
From:	Duc Dang <dhdang@....com>
To:	"Theodore Ts'o" <tytso@....edu>,
	Andreas Dilger <adilger.kernel@...ger.ca>,
	Jan Kara <jack@...e.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-ext4@...r.kernel.org, USB list <linux-usb@...r.kernel.org>,
	patches <patches@....com>
Subject: 4.2 kernel trace when hot unplug a mounted USB/SATA/MMC devices with
 ext2/ext3/ext4 file system

Hi Theodore, Andreas, Jan, Andrew and All,

We are seeing kernel trace when we disconnect an USB/SATA/MMC devices
that has its ext2/ext3/ext4 partition currently mounted. These traces
are seen with kernel 4.2-rc5 on APM Arm64 X-Gene platforms. Similar
issue also happens on an x86 machine (Lenovo T420s running Fedora Core
22 (Linux 4.1.x))

We also tested with xfs kernel and kernel complains with some error
message but there is no trace:

usb 1-1: USB disconnect, device number 3
XFS (sda1): Unmounting Filesystem
XFS (sda1): metadata I/O error: block 0x1ddc12 ("xlog_iodone") error 19 numblks
64
XFS (sda1): xfs_do_force_shutdown(0x2) called from line 1180 of file
/projects/svdc/P4wsIPCSW/buildsw_shadowcat_2_03/shadowcat/linux/fs/xfs/xfs_log.c.
 Return address = 0xffffffc0003aa8d8
XFS (sda1): Log I/O Error Detected.  Shutting down filesystem
XFS (sda1): Unable to update superblock counters. Freespace may not be correct
on next mount.
XFS (sda1): xfs_log_force: error -5 returned.
XFS (sda1): Please umount the filesystem and rectify the problem(s)

Below are traces for each case. Do you aware of this issue and is
there a fix for it?

CASE 1: SATA with ext2 partition:

EXT2-fs (sda1): previous I/O error to superblock detected

Unable to handle kernel paging request at virtual address 1ff256000
pgd = ffffffc0e784b000
[1ff256000] *pgd=0000000000000000, *pud=0000000000000000
Internal error: Oops: 96000005 [#1] PREEMPT SMP
Modules linked in:
CPU: 4 PID: 1484 Comm: umount Not tainted 4.1.0-xgene_sw_2.03.05-beta_rc_pm #1
Hardware name: APM X-Gene Mustang board (DT)
task: ffffffc1ed5d3840 ti: ffffffc0e79dc000 task.ti: ffffffc0e79dc000
PC is at __percpu_counter_add+0x2c/0x10c
LR is at account_page_dirtied+0x78/0x12c
pc : [<ffffffc00043666c>] lr : [<ffffffc000147180>] pstate: 800001c5
sp : ffffffc0e79dfc40
x29: ffffffc0e79dfc40 x28: ffffffc0e79dc000
x27: ffffffc000927000 x26: 0000000000000027
x25: 000000000000011a x24: 0000000000000015
x23: 0000000080000000 x22: 0000000000000140
x21: ffffffc000d33000 x20: ffffffc1f6440fb8
x19: ffffffbec7b3e500 x18: 0000000000000000
x17: 0000007f8d95bfd0 x16: ffffffc0001dfad0
x15: 003b9aca00000000 x14: 0ffffffffffffffe
x13: 0000000000000020 x12: 0101010101010101
x11: 0000000000000174 x10: 0000000000000006
x9 : ffffffc1fff1e35c x8 : 746564206b636f6c
x7 : ffffffc000d33618 x6 : 00000001ff256000
x5 : ffffffc0e79dfc40 x4 : ffffffc0e79dc000
x3 : 0000000000000000 x2 : 0000000000000020
x1 : 0000000000000001 x0 : 00000001ff256000

Process umount (pid: 1484, stack limit = 0xffffffc0e79dc020)
Stack: (0xffffffc0e79dfc40 to 0xffffffc0e79e0000)
fc40: e79dfc70 ffffffc0 00147180 ffffffc0 c7b3e500 ffffffbe f6440f78 ffffffc1
fc60: e79dfc70 ffffffc0 0014716c ffffffc0 e79dfcb0 ffffffc0 001ccd7c ffffffc0
fc80: c7b3e500 ffffffbe f6b28f48 ffffffc1 f6b28f60 ffffffc1 e79dfca0 ffffffc0
fca0: 00000000 00000000 f6b28f48 ffffffc1 e79dfd00 ffffffc0 001cdfd4 ffffffc0
fcc0: c7b3e500 ffffffbe ecf94400 ffffffc1 ee6022d8 ffffffc0 00000000 00000000
fce0: 80000000 00000000 00226674 ffffffc0 e79dfd20 ffffffc0 00000000 00000000
fd00: e79dfd20 ffffffc0 0022ac84 ffffffc0 f6ff7000 ffffffc1 ecf94400 ffffffc1
fd20: e79dfd50 ffffffc0 0022ad0c ffffffc0 f677e380 ffffffc1 ecf94400 ffffffc1
fd40: f6ff7000 ffffffc1 ed5d3840 ffffffc1 e79dfd90 ffffffc0 001cb0c4 ffffffc0
fd60: f6ff7000 ffffffc1 f6ff70a8 ffffffc1 00946080 ffffffc0 001b5ff0 ffffffc0
fd80: f6ff7000 ffffffc1 00000000 00000000 e79dfdb0 ffffffc0 001a05e0 ffffffc0
fda0: f6ff7000 ffffffc1 00000083 00000000 e79dfde0 ffffffc0 001a0958 ffffffc0
fdc0: f6b28d00 ffffffc1 00000083 00000000 00db9000 ffffffc0 00000015 00000000
fde0: e79dfe10 ffffffc0 001a0c68 ffffffc0 f6ff7000 ffffffc1 00d511e8 ffffffc0
fe00: 00db9000 ffffffc0 00d511e8 ffffffc0 e79dfe30 ffffffc0 001a1168 ffffffc0
fe20: f6ff7000 ffffffc1 00000000 00000000 e79dfe50 ffffffc0 001bcef0 ffffffc0
fe40: f6c8b080 ffffffc1 00000015 00000000 e79dfe70 ffffffc0 001bcf94 ffffffc0
fe60: ed5d4190 ffffffc1 90a791c8 0000007f e79dfe80 ffffffc0 000ce47c ffffffc0
fe80: e79dfeb0 ffffffc0 00089800 ffffffc0 0000000c 00000000 79a5e4f0 00000055
fea0: ffffffff ffffffff 90a791c8 0000007f dc5d82a0 0000007f 00085b54 ffffffc0
fec0: 00000000 00000000 e79dfec0 ffffffc0 00000000 00000000 00000000 00000000
fee0: 00000000 00000000 00000000 00000000 80000000 80808080 00000000 00000000
ff00: 80808080 00000080 ff2f6172 fefefefe 00000027 00000000 00000004 00000000
ff20: 01010101 01010101 00000030 00000000 00000006 00000000 6974616f 6e2c656d
ff40: 00000000 00000000 0000578b 00000000 90a79180 0000007f 756f8ed0 00000055
ff60: 00000000 00000000 79a5e4f0 00000055 79a5e4f0 00000055 00000002 00000000
ff80: 00000002 00000000 79a5e550 00000055 00000000 00000000 dc5d8410 0000007f
ffa0: 79a5e530 00000055 756f5df1 00000055 00000000 00000000 dc5d82a0 0000007f
ffc0: 756a2ae0 00000055 dc5d8150 0000007f 90a791c8 0000007f 80000000 00000000
ffe0: 79a5e530 00000055 00000027 00000000 00000000 00000000 00000000 00000000
Call trace:
[<ffffffc00043666c>] __percpu_counter_add+0x2c/0x10c
[<ffffffc00014717c>] account_page_dirtied+0x74/0x12c
[<ffffffc0001ccd78>] __set_page_dirty+0x48/0xd0
[<ffffffc0001cdfd0>] mark_buffer_dirty+0x74/0xa8
[<ffffffc00022ac80>] ext2_sync_super+0x98/0xbc
[<ffffffc00022ad08>] ext2_sync_fs+0x64/0x7c
[<ffffffc0001cb0c0>] sync_filesystem+0x50/0xb0
[<ffffffc0001a05dc>] generic_shutdown_super+0x2c/0xd8
[<ffffffc0001a0954>] kill_block_super+0x1c/0x70
[<ffffffc0001a0c64>] deactivate_locked_super+0x54/0x84
[<ffffffc0001a1164>] deactivate_super+0x8c/0x9c
[<ffffffc0001bceec>] cleanup_mnt+0x38/0x84
[<ffffffc0001bcf90>] __cleanup_mnt+0xc/0x18
[<ffffffc0000ce478>] task_work_run+0x98/0xec
[<ffffffc0000897fc>] do_notify_resume+0x54/0x68
Code: 11000400 b9001880 f9401283 d538d080 (b8a36813)
---[ end trace 1cc4dbc7f8fabff6 ]---
note: umount[1484] exited with preempt_count 2


CASE 2: SATA with ext3 partition:

Unable to handle kernel paging request at virtual address 1ff223000
pgd = ffffffc0e7a0b000
[1ff223000] *pgd=0000000000000000, *pud=0000000000000000
Internal error: Oops: 96000005 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 1481 Comm: umount Not tainted 4.1.0-xgene_sw_2.03.05-beta_rc_pm #1
Hardware name: APM X-Gene Mustang board (DT)
task: ffffffc1ec556540 ti: ffffffc0e7b8c000 task.ti: ffffffc0e7b8c000
PC is at __percpu_counter_add+0x2c/0x10c
LR is at account_page_dirtied+0x78/0x12c
pc : [<ffffffc00043666c>] lr : [<ffffffc000147180>] pstate: 800001c5
sp : ffffffc0e7b8fc80
x29: ffffffc0e7b8fc80 x28: ffffffc0e7b8c000
x27: ffffffc000927000 x26: 0000000000000027
x25: 000000000000011a x24: 0000000000000015
x23: 0000000080000000 x22: 0000000000000140
x21: ffffffc000d33000 x20: ffffffc1f6100fb8
x19: ffffffbec0102680 x18: 0000000000000001
x17: 0000000000000007 x16: 000000000000000e
x15: 0000000000000013 x14: 000000000000001a
x13: 000000006234d2b5 x12: 00000000f4033c40
x11: 0000000000000007 x10: 000000000000001f
x9 : ffffffc0e7b8fc20 x8 : ffffffc1ec556ac0
x7 : 0000000000000000 x6 : 00000001ff223000
x5 : ffffffc0e7b8fc80 x4 : ffffffc0e7b8c000
x3 : 0000000000000000 x2 : 0000000000000020
x1 : 0000000000000001 x0 : 00000001ff223000

Process umount (pid: 1481, stack limit = 0xffffffc0e7b8c020)
Stack: (0xffffffc0e7b8fc80 to 0xffffffc0e7b90000)
fc80: e7b8fcb0 ffffffc0 00147180 ffffffc0 c0102680 ffffffbe f6100f78 ffffffc1
fca0: e7b8fcb0 ffffffc0 0014716c ffffffc0 e7b8fcf0 ffffffc0 001ccd7c ffffffc0
fcc0: c0102680 ffffffbe f6b38c08 ffffffc1 f6b38c20 ffffffc1 00000015 00000000
fce0: 0000011a 00000000 f6b38c08 ffffffc1 e7b8fd40 ffffffc0 001cdfd4 ffffffc0
fd00: c0102680 ffffffbe e79b2800 ffffffc0 f6ff5000 ffffffc1 ec556540 ffffffc1
fd20: 80000000 00000000 f6ff4f98 ffffffc1 f6ff50a8 ffffffc1 00000000 00000000
fd40: e7b8fd70 ffffffc0 0021f508 ffffffc0 0409a400 ffffffc0 e79b2800 ffffffc0
fd60: e7b8fdb0 ffffffc0 001a05fc ffffffc0 e7b8fdb0 ffffffc0 001a061c ffffffc0
fd80: f6ff5000 ffffffc1 f6ff50a8 ffffffc1 00945068 ffffffc0 ec556540 ffffffc1
fda0: 80000000 00000000 00000015 00000000 e7b8fde0 ffffffc0 001a0958 ffffffc0
fdc0: f6b389c0 ffffffc1 00000083 00000000 00db9000 ffffffc0 00000015 00000000
fde0: e7b8fe10 ffffffc0 001a0c68 ffffffc0 f6ff5000 ffffffc1 00d511a8 ffffffc0
fe00: 00db9000 ffffffc0 00d511a8 ffffffc0 e7b8fe30 ffffffc0 001a1168 ffffffc0
fe20: f6ff5000 ffffffc1 00000000 00000000 e7b8fe50 ffffffc0 001bcef0 ffffffc0
fe40: f6484480 ffffffc1 00000015 00000000 e7b8fe70 ffffffc0 001bcf94 ffffffc0
fe60: ec556e90 ffffffc1 a5a711c8 0000007f e7b8fe80 ffffffc0 000ce47c ffffffc0
fe80: e7b8feb0 ffffffc0 00089800 ffffffc0 0000000c 00000000 63b9a4f0 00000055
fea0: ffffffff ffffffff a5a711c8 0000007f c8834260 0000007f 00085b54 ffffffc0
fec0: 00000000 00000000 e7b8fec0 ffffffc0 00000000 00000000 00000000 00000000
fee0: 00000000 00000000 00000000 00000000 80000000 80808080 00000000 00000000
ff00: 80808080 00000080 ff2f6172 fefefefe 00000027 00000000 00000004 00000000
ff20: 01010101 01010101 00000030 00000000 00000006 00000000 756e6974 61622c65
ff40: 00000000 00000000 0000578b 00000000 a5a71180 0000007f 58bd4ed0 00000055
ff60: 00000000 00000000 63b9a4f0 00000055 63b9a4f0 00000055 00000002 00000000
ff80: 00000002 00000000 63b9a550 00000055 00000000 00000000 c88343d0 0000007f
ffa0: 63b9a530 00000055 58bd1df1 00000055 00000000 00000000 c8834260 0000007f
ffc0: 58b7eae0 00000055 c8834110 0000007f a5a711c8 0000007f 80000000 00000000
ffe0: 63b9a530 00000055 00000027 00000000 00000000 00000000 00000000 00000000
Call trace:
[<ffffffc00043666c>] __percpu_counter_add+0x2c/0x10c
[<ffffffc00014717c>] account_page_dirtied+0x74/0x12c
[<ffffffc0001ccd78>] __set_page_dirty+0x48/0xd0
[<ffffffc0001cdfd0>] mark_buffer_dirty+0x74/0xa8
[<ffffffc00021f504>] ext3_put_super+0x1ec/0x250
[<ffffffc0001a0618>] generic_shutdown_super+0x68/0xd8
[<ffffffc0001a0954>] kill_block_super+0x1c/0x70
[<ffffffc0001a0c64>] deactivate_locked_super+0x54/0x84
[<ffffffc0001a1164>] deactivate_super+0x8c/0x9c
[<ffffffc0001bceec>] cleanup_mnt+0x38/0x84
[<ffffffc0001bcf90>] __cleanup_mnt+0xc/0x18
[<ffffffc0000ce478>] task_work_run+0x98/0xec
[<ffffffc0000897fc>] do_notify_resume+0x54/0x68
Code: 11000400 b9001880 f9401283 d538d080 (b8a36813)
---[ end trace 2ca8304c40f82d27 ]---
note: umount[1481] exited with preempt_count 2

[root@...p-10-38-7-195 ~]#

CASE 3: SATA with ext4 partition:

Unable to handle kernel paging request at virtual address 1ff234000
pgd = ffffffc0df2de000
[1ff234000] *pgd=0000000000000000, *pud=0000000000000000
Internal error: Oops: 96000005 [#1] PREEMPT SMP
Modules linked in:
CPU: 2 PID: 1427 Comm: umount Not tainted 4.1.0-xgene_sw_2.03.05-beta_rc_pm #1
Hardware name: APM X-Gene Mustang board (DT)
task: ffffffc0e7bdda00 ti: ffffffc0e4198000 task.ti: ffffffc0e4198000
PC is at __percpu_counter_add+0x2c/0x10c
LR is at account_page_dirtied+0x78/0x12c
pc : [<ffffffc00043666c>] lr : [<ffffffc000147180>] pstate: 800001c5
sp : ffffffc0e419bba0
x29: ffffffc0e419bba0 x28: ffffffc0e4198000
x27: ffffffc000d33718 x26: ffffffc1f6ff7000
x25: fffffffffffbd6a8 x24: 7ffffffffffffd9c
x23: 0000000000000001 x22: 0000000000000140
x21: ffffffc000d33000 x20: ffffffc1ed660fb8
x19: ffffffbec39e6440 x18: 0000000000000001
x17: 0000000000000007 x16: 000000000000000e
x15: 0000000000000013 x14: 000000000000001a
x13: 00000000c6edf8a0 x12: 0000000009ffffff
x11: 0000000000000000 x10: 7f7f7f7f7f7f7f7f
x9 : 0000000000000000 x8 : 0000000000000001
x7 : 0000000000000000 x6 : 00000001ff234000
x5 : ffffffc0e419bba0 x4 : ffffffc0e4198000
x3 : 0000000000000000 x2 : 0000000000000020
x1 : 0000000000000001 x0 : 00000001ff234000

Process umount (pid: 1427, stack limit = 0xffffffc0e4198020)
Stack: (0xffffffc0e419bba0 to 0xffffffc0e419c000)
bba0: e419bbd0 ffffffc0 00147180 ffffffc0 c39e6440 ffffffbe ed660f78 ffffffc1
bbc0: e419bbd0 ffffffc0 0014716c ffffffc0 e419bc10 ffffffc0 001ccd7c ffffffc0
bbe0: c39e6440 ffffffbe ee670248 ffffffc0 ee670260 ffffffc0 00000027 00000000
bc00: e419bc50 ffffffc0 ee670248 ffffffc0 e419bc60 ffffffc0 001cdfd4 ffffffc0
bc20: c39e6440 ffffffbe 00d33000 ffffffc0 e7142340 ffffffc1 e7991400 ffffffc0
bc40: 00000001 00000000 002456c4 ffffffc0 e419bc80 ffffffc0 00000000 00000000
bc60: e419bc80 ffffffc0 002456e0 ffffffc0 00d33628 ffffffc0 00d33000 ffffffc0
bc80: e419bce0 ffffffc0 00245f24 ffffffc0 f6ff7000 ffffffc1 000002fd 00000000
bca0: 00948000 ffffffc0 00bc9828 ffffffc0 80000000 00000000 00000015 00000000
bcc0: 0000011a 00000000 00000027 00000000 00927000 ffffffc0 e419bd60 ffffffc0
bce0: e419bd70 ffffffc0 002465d8 ffffffc0 f6ff6800 ffffffc1 e7991400 ffffffc0
bd00: f6ff7000 ffffffc1 e7bdda00 ffffffc0 f6ff6800 ffffffc1 e7991400 ffffffc0
bd20: f6ff7000 ffffffc1 e7bdda00 ffffffc0 80000000 00000000 000ca368 ffffffc0
bd40: e419bd70 ffffffc0 00000000 ffffffc0 00000000 00000000 40000000 00000000
bd60: f6c972a0 ffffffc1 00000000 00000000 e419bdb0 ffffffc0 001a061c ffffffc0
bd80: f6ff7000 ffffffc1 f6ff70a8 ffffffc1 00948170 ffffffc0 e7bdda00 ffffffc0
bda0: 80000000 00000000 00000015 00000000 e419bde0 ffffffc0 001a0958 ffffffc0
bdc0: ee670000 ffffffc0 00000083 00000000 00db9000 ffffffc0 00000015 00000000
bde0: e419be10 ffffffc0 001a0c68 ffffffc0 f6ff7000 ffffffc1 00d51260 ffffffc0
be00: 00db9000 ffffffc0 00d51260 ffffffc0 e419be30 ffffffc0 001a1168 ffffffc0
be20: f6ff7000 ffffffc1 00000000 00000000 e419be50 ffffffc0 001bcef0 ffffffc0
be40: f6c8b080 ffffffc1 00000015 00000000 e419be70 ffffffc0 001bcf94 ffffffc0
be60: e7bde350 ffffffc0 917b41c8 0000007f e419be80 ffffffc0 000ce47c ffffffc0
be80: e419beb0 ffffffc0 00089800 ffffffc0 00000004 00000000 829b3490 00000055
bea0: ffffffff ffffffff 917b41c8 0000007f c0a37b80 0000007f 00085b54 ffffffc0
bec0: 00000000 00000000 e419bec0 ffffffc0 00000000 00000000 00000000 00000000
bee0: 00000000 00000000 00000000 00000000 80000000 80808080 00000000 00000000
bf00: 80808080 00000080 ff2f6172 fefefefe 00000027 00000000 00000004 00000000
bf20: 01010101 01010101 00000030 00000000 00000006 00000000 39393d73 38323232
bf40: 00000000 00000000 0000578b 00000000 917b4180 0000007f 6ef9aed0 00000055
bf60: 00000000 00000000 829b3490 00000055 829b3490 00000055 00000002 00000000
bf80: 00000002 00000000 829b34f0 00000055 00000000 00000000 c0a37cf0 0000007f
bfa0: 829b34d0 00000055 6ef97df1 00000055 00000000 00000000 c0a37b80 0000007f
bfc0: 6ef44ae0 00000055 c0a37a30 0000007f 917b41c8 0000007f 80000000 00000000
bfe0: 829b34d0 00000055 00000027 00000000 00000000 00000000 00000000 00000000
Call trace:
[<ffffffc00043666c>] __percpu_counter_add+0x2c/0x10c
[<ffffffc00014717c>] account_page_dirtied+0x74/0x12c
[<ffffffc0001ccd78>] __set_page_dirty+0x48/0xd0
[<ffffffc0001cdfd0>] mark_buffer_dirty+0x74/0xa8
[<ffffffc0002456dc>] ext4_commit_super+0x130/0x1f8
[<ffffffc000245f20>] __ext4_abort+0x3c/0x13c
[<ffffffc0002465d4>] ext4_put_super+0x278/0x2f4
[<ffffffc0001a0618>] generic_shutdown_super+0x68/0xd8
[<ffffffc0001a0954>] kill_block_super+0x1c/0x70
[<ffffffc0001a0c64>] deactivate_locked_super+0x54/0x84
[<ffffffc0001a1164>] deactivate_super+0x8c/0x9c
[<ffffffc0001bceec>] cleanup_mnt+0x38/0x84
[<ffffffc0001bcf90>] __cleanup_mnt+0xc/0x18
[<ffffffc0000ce478>] task_work_run+0x98/0xec
[<ffffffc0000897fc>] do_notify_resume+0x54/0x68
Code: 11000400 b9001880 f9401283 d538d080 (b8a36813)
---[ end trace 3ae5dc2cd97a2315 ]---
note: umount[1427] exited with preempt_count 2

CASE 4: MMC with ext4 partition

[root@...p-10-38-7-195 ~]# mmc0: card 0002 removed
------------[ cut here ]------------
WARNING: CPU: 0 PID: 1461 at
/projects/svdc/P4wsIPCSW/buildsw_shadowcat_2_03/shadowcat/linux/fs/block_dev.c:56
__blkdev_put+0xe4/0x210()
Modules linked in:
CPU: 0 PID: 1461 Comm: umount Not tainted 4.1.0-xgene_sw_2.03.05-beta_rc_pm #1
Hardware name: APM X-Gene Mustang board (DT)
Call trace:
[<ffffffc000089ab8>] dump_backtrace+0x0/0x11c
[<ffffffc000089be4>] show_stack+0x10/0x1c
[<ffffffc000917560>] dump_stack+0x84/0xc8
[<ffffffc0000b4f24>] warn_slowpath_common+0x90/0xc8
[<ffffffc0000b5020>] warn_slowpath_null+0x14/0x20
[<ffffffc0001d3360>] __blkdev_put+0xe0/0x210
[<ffffffc0001d3c78>] blkdev_put+0x4c/0x158
[<ffffffc0001a096c>] kill_block_super+0x34/0x70
[<ffffffc0001a0c64>] deactivate_locked_super+0x54/0x84
[<ffffffc0001a1164>] deactivate_super+0x8c/0x9c
[<ffffffc0001bceec>] cleanup_mnt+0x38/0x84
[<ffffffc0001bcf90>] __cleanup_mnt+0xc/0x18
[<ffffffc0000ce478>] task_work_run+0x98/0xec
[<ffffffc0000897fc>] do_notify_resume+0x54/0x68
---[ end trace 52ed61a627c95f4b ]---
random: nonblocking pool is initialized

USB with ext4 partition:

[root@...p-10-38-7-195 ~]# usb 1-1.1: USB disconnect, device number 3
sd 4:0:0:0: [sda] UNKNOWN(0x2003) Result: hostbyte=0x01 driverbyte=0x00
sd 4:0:0:0: [sda] CDB: opcode=0x2a 2a 00 00 00 3f f8 00 00 f0 00
blk_update_request: I/O error, dev sda, sector 16376
Aborting journal on device sda1-8.
JBD2: Error -5 detected when updating journal superblock for sda1-8.
Unable to handle kernel paging request at virtual address 1ff267000
pgd = ffffffc1ed246000
[1ff267000] *pgd=0000000000000000, *pud=0000000000000000
Internal error: Oops: 96000005 [#1] PREEMPT SMP
Modules linked in:
CPU: 5 PID: 1470 Comm: umount Not tainted 4.1.0-xgene_sw_2.03.05-beta_rc_pm #1
Hardware name: APM X-Gene Mustang board (DT)
task: ffffffc0e7c56540 ti: ffffffc0e7b24000 task.ti: ffffffc0e7b24000
PC is at __percpu_counter_add+0x2c/0x10c
LR is at account_page_dirtied+0x78/0x12c
pc : [<ffffffc00043666c>] lr : [<ffffffc000147180>] pstate: 800001c5
sp : ffffffc0e7b27ba0
x29: ffffffc0e7b27ba0 x28: ffffffc0e7b24000
x27: ffffffc000d33718 x26: ffffffc1ed1d1000
x25: 0000000000000000 x24: 000000000000825d
x23: 0000000000000001 x22: 0000000000000140
x21: ffffffc000d33000 x20: ffffffc1ed2581b8
x19: ffffffbec7b206c0 x18: 0000000000000001
x17: 0000000000000007 x16: 000000000000000e
x15: 0000000000000013 x14: 000000000000001a
x13: 00000000a3e2cfc2 x12: 00000000277fffff
x11: 0000000000000000 x10: 7f7f7f7f7f7f7f7f
x9 : 0000000000000000 x8 : 0000000000000001
x7 : 0000000000000000 x6 : 00000001ff267000
x5 : ffffffc0e7b27ba0 x4 : ffffffc0e7b24000
x3 : 0000000000000000 x2 : 0000000000000020
x1 : 0000000000000001 x0 : 00000001ff267000

Process umount (pid: 1470, stack limit = 0xffffffc0e7b24020)
Stack: (0xffffffc0e7b27ba0 to 0xffffffc0e7b28000)
7ba0: e7b27bd0 ffffffc0 00147180 ffffffc0 c7b206c0 ffffffbe ed258178 ffffffc1
7bc0: e7b27bd0 ffffffc0 0014716c ffffffc0 e7b27c10 ffffffc0 001ccd7c ffffffc0
7be0: c7b206c0 ffffffbe f6a69288 ffffffc1 f6a692a0 ffffffc1 00000027 00000000
7c00: e7b27c50 ffffffc0 f6a69288 ffffffc1 e7b27c60 ffffffc0 001cdfd4 ffffffc0
7c20: c7b206c0 ffffffbe 00d33000 ffffffc0 ee672340 ffffffc0 ec81b400 ffffffc1
7c40: 00000001 00000000 002456c4 ffffffc0 e7b27c80 ffffffc0 00000000 00000000
7c60: e7b27c80 ffffffc0 002456e0 ffffffc0 00d33628 ffffffc0 00d33000 ffffffc0
7c80: e7b27ce0 ffffffc0 00245f24 ffffffc0 ed1d1000 ffffffc1 000002fd 00000000
7ca0: 00948000 ffffffc0 00bc9828 ffffffc0 80000000 00000000 00000015 00000000
7cc0: 0000011a 00000000 00000027 00000000 00927000 ffffffc0 e7b27d60 ffffffc0
7ce0: e7b27d70 ffffffc0 002465d8 ffffffc0 ed1d5800 ffffffc1 ec81b400 ffffffc1
7d00: ed1d1000 ffffffc1 e7c56540 ffffffc0 ed1d5800 ffffffc1 ec81b400 ffffffc1
7d20: ed1d1000 ffffffc1 e7c56540 ffffffc0 80000000 00000000 000ca368 ffffffc0
7d40: e7b27d70 ffffffc0 00000000 ffffffc0 00000000 00000000 40000000 00000000
7d60: f6c972a0 ffffffc1 00000000 00000000 e7b27db0 ffffffc0 001a061c ffffffc0
7d80: ed1d1000 ffffffc1 ed1d10a8 ffffffc1 00948170 ffffffc0 e7c56540 ffffffc0
7da0: 80000000 00000000 00000015 00000000 e7b27de0 ffffffc0 001a0958 ffffffc0
7dc0: f6a69040 ffffffc1 00000083 00000000 00db9000 ffffffc0 00000015 00000000
7de0: e7b27e10 ffffffc0 001a0c68 ffffffc0 ed1d1000 ffffffc1 00d51260 ffffffc0
7e00: 00db9000 ffffffc0 00d51260 ffffffc0 e7b27e30 ffffffc0 001a1168 ffffffc0
7e20: ed1d1000 ffffffc1 00000000 00000000 e7b27e50 ffffffc0 001bcef0 ffffffc0
7e40: ed0aed80 ffffffc1 00000015 00000000 e7b27e70 ffffffc0 001bcf94 ffffffc0
7e60: e7c56e90 ffffffc0 7f41c1c8 0000007f e7b27e80 ffffffc0 000ce47c ffffffc0
7e80: e7b27eb0 ffffffc0 00089800 ffffffc0 00000004 00000000 aca13490 00000055
7ea0: ffffffff ffffffff 7f41c1c8 0000007f f88d2650 0000007f 00085b54 ffffffc0
7ec0: 00000000 00000000 e7b27ec0 ffffffc0 00000000 00000000 00000000 00000000
7ee0: 00000000 00000000 00000000 00000000 80000000 80808080 00000000 00000000
7f00: 80808080 00000080 ff2f6172 fefefefe 00000027 00000000 00000004 00000000
7f20: 01010101 01010101 00000030 00000000 00000006 00000000 74617269 2c656d69
7f40: 00000000 00000000 0000578b 00000000 7f41c180 0000007f 9527ced0 00000055
7f60: 00000000 00000000 aca13490 00000055 aca13490 00000055 00000002 00000000
7f80: 00000002 00000000 aca134f0 00000055 00000000 00000000 f88d27c0 0000007f
7fa0: aca134d0 00000055 95279df1 00000055 00000000 00000000 f88d2650 0000007f
7fc0: 95226ae0 00000055 f88d2500 0000007f 7f41c1c8 0000007f 80000000 00000000
7fe0: aca134d0 00000055 00000027 00000000 00000000 00000000 00000000 00000000
Call trace:
[<ffffffc00043666c>] __percpu_counter_add+0x2c/0x10c
[<ffffffc00014717c>] account_page_dirtied+0x74/0x12c
[<ffffffc0001ccd78>] __set_page_dirty+0x48/0xd0
[<ffffffc0001cdfd0>] mark_buffer_dirty+0x74/0xa8
[<ffffffc0002456dc>] ext4_commit_super+0x130/0x1f8
[<ffffffc000245f20>] __ext4_abort+0x3c/0x13c
[<ffffffc0002465d4>] ext4_put_super+0x278/0x2f4
[<ffffffc0001a0618>] generic_shutdown_super+0x68/0xd8
[<ffffffc0001a0954>] kill_block_super+0x1c/0x70
[<ffffffc0001a0c64>] deactivate_locked_super+0x54/0x84
[<ffffffc0001a1164>] deactivate_super+0x8c/0x9c
[<ffffffc0001bceec>] cleanup_mnt+0x38/0x84
[<ffffffc0001bcf90>] __cleanup_mnt+0xc/0x18
[<ffffffc0000ce478>] task_work_run+0x98/0xec
[<ffffffc0000897fc>] do_notify_resume+0x54/0x68
Code: 11000400 b9001880 f9401283 d538d080 (b8a36813)
---[ end trace 3db0dd3586537f6d ]---
note: umount[1470] exited with preempt_count 2

CASE 5: Trace on x86 Lenovo T420 machine running Fedora core 22 (Kernel 4.1.x)
[<ffffffc0000899e4>] dump_backtrace+0x0/0x11c
[<ffffffc000089b10>]show_stack+0x10/0x1c
[<ffffffc000573614>] dump_stack+0x80/0xc4
[<ffffffc0000b1664>] warn_slowpath_common+0x90/0xc8
[<ffffffc0000b1760>] warn_slowpath_null+0x14/0x20
[<ffffffc0001ca500>] __blkdev_put+0xe0/0x210
[<ffffffc0001cae18>] blkdev_put+0x4c/0x158
[<ffffffc00019853c>] kill_block_super+0x34/0x70
[<ffffffc000198838>] deactivate_locked_super+0x54/0x84
[<ffffffc000198d38>] deactivate_super+0x8c/0x9c
[<ffffffc0001b46d4>] cleanup_mnt+0x38/0x84
[<ffffffc0001b4778>] __cleanup_mnt+0xc/0x18
[<ffffffc0000ca4b0>] task_work_run+0x94/0xe8
[<ffffffc000089728>] do_notify_resume+0x54/0x68
---[ end trace 1fa355ac70316ea2 ]---


-- 
Regards,
Duc Dang.
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