It happened again.
$ uname -r
4.14.9-041409-generic
Dec 29 14:32:14 lakshmi kernel: BUG: unable to handle kernel NULL pointer
dereference at (null)
Dec 29 14:32:14 lakshmi kernel: IP: locked_inode_to_wb_and_lock_list+0x20/0x110
Dec 29 14:32:14 lakshmi kernel: PGD 0 P4D 0
Dec 29 14:32:14 lakshmi kernel: Oops: 0000 [#1] SMP
Dec 29 14:32:14 lakshmi kernel: Modules linked in: uas usb_storage nfnetlink
bluetooth ecdh_generic isofs xt_CHECKSUM
Dec 29 14:32:14 lakshmi kernel: lp parport ip_tables x_tables autofs4 xfs
btrfs zstd_compress raid10 raid456 async_ra
Dec 29 14:32:14 lakshmi kernel: CPU: 4 PID: 67 Comm: kswapd0 Not tainted
4.14.9-041409-generic #201712251541
Dec 29 14:32:14 lakshmi kernel: Hardware name: System manufacturer System
Product Name/M4A89GTD-PRO/USB3, BIOS 3029
Dec 29 14:32:14 lakshmi kernel: task: ffff9ab5e4c195c0 task.stack:
ffffa9a5c1da0000
Dec 29 14:32:14 lakshmi kernel: RIP:
0010:locked_inode_to_wb_and_lock_list+0x20/0x110
Dec 29 14:32:14 lakshmi kernel: RSP: 0018:ffffa9a5c1da3c38 EFLAGS: 00010292
Dec 29 14:32:14 lakshmi kernel: RAX: 0000000000000000 RBX: 0000000000000000
RCX: ffffa9a5c1da3cb0
Dec 29 14:32:14 lakshmi kernel: RDX: 0000000000000001 RSI: 0000000005080020
RDI: ffff9ab3f58dea58
Dec 29 14:32:14 lakshmi kernel: RBP: ffff9ab3f58dea58 R08: 0000000000000000
R09: ffff9ab3f5992b38
Dec 29 14:32:14 lakshmi kernel: R10: 0000000000000000 R11: 0000000000000228
R12: ffff9ab3f58deae0
Dec 29 14:32:14 lakshmi kernel: R13: ffff9ab5da2d9000 R14: 0000000000000000
R15: 0000000000000265
Dec 29 14:32:14 lakshmi kernel: FS: 0000000000000000(0000)
GS:ffff9ab5f7d00000(0000) knlGS:0000000000000000
Dec 29 14:32:14 lakshmi kernel: CS: 0010 DS: 0000 ES: 0000 CR0:
0000000080050033
Dec 29 14:32:14 lakshmi kernel: CR2: 0000000000000000 CR3: 000000041a0cb000
CR4: 00000000000006e0
Dec 29 14:32:14 lakshmi kernel: Call Trace:
Dec 29 14:32:14 lakshmi kernel: inode_io_list_del+0x1e/0x40
Dec 29 14:32:14 lakshmi kernel: evict+0x50/0x190
Dec 29 14:32:14 lakshmi kernel: dispose_list+0x35/0x50
Dec 29 14:32:14 lakshmi kernel: prune_icache_sb+0x52/0x70
Dec 29 14:32:14 lakshmi kernel: super_cache_scan+0x124/0x1a0
Dec 29 14:32:14 lakshmi kernel: shrink_slab.part.50+0x1de/0x3d0
Dec 29 14:32:14 lakshmi kernel: shrink_node+0x123/0x310
Dec 29 14:32:14 lakshmi kernel: kswapd+0x29f/0x6f0
Dec 29 14:32:14 lakshmi kernel: ? mem_cgroup_shrink_node+0x190/0x190
Dec 29 14:32:14 lakshmi kernel: kthread+0x118/0x130
Dec 29 14:32:14 lakshmi kernel: ? kthread_create_on_node+0x70/0x70
Dec 29 14:32:14 lakshmi kernel: ret_from_fork+0x1f/0x30
Dec 29 14:32:14 lakshmi kernel: Code: 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44
00 00 41 55 41 54 4c 8d a7 88 00 00 00
Dec 29 14:32:14 lakshmi kernel: RIP:
locked_inode_to_wb_and_lock_list+0x20/0x110 RSP: ffffa9a5c1da3c38
Dec 29 14:32:14 lakshmi kernel: CR2: 0000000000000000
Dec 29 14:32:14 lakshmi kernel: ---[ end trace 40202702d10d2b9b ]---
** Changed in: linux (Ubuntu)
Status: Incomplete => New
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https://bugs.launchpad.net/bugs/1730374
Title:
NULL pointer dereference during writeback
Status in linux package in Ubuntu:
New
Bug description:
Happened during dd of 40GB LV:
$ sudo dd if=/dev/vg0/gentoo of=/dev/vg1/gentoo
I also used SIGUSR1 on the dd to monitor it occasionally. There was
other activity at the time as well.
It appears that an attempt was made to fix this in 4.10
https://patchwork.kernel.org/patch/9614353/
but it is still happening in 4.13
Nov 06 04:19:13 lakshmi kernel: BUG: unable to handle kernel NULL pointer
dereference at (null)
Nov 06 04:19:13 lakshmi kernel: IP:
locked_inode_to_wb_and_lock_list+0x26/0x110
Nov 06 04:19:13 lakshmi kernel: PGD 0
Nov 06 04:19:14 lakshmi kernel: P4D 0
Nov 06 04:19:14 lakshmi kernel:
Nov 06 04:19:14 lakshmi kernel: Oops: 0000 [#1] SMP
Nov 06 04:19:14 lakshmi kernel: Modules linked in: xt_CHECKSUM iptable_mangle
ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_
Nov 06 04:19:14 lakshmi kernel: async_memcpy async_pq async_xor async_tx xor
raid6_pq libcrc32c raid0 multipath linear raid1 hid_g
Nov 06 04:19:14 lakshmi kernel: CPU: 0 PID: 67 Comm: kswapd0 Not tainted
4.13.0-16-generic #19-Ubuntu
Nov 06 04:19:14 lakshmi kernel: Hardware name: System manufacturer System
Product Name/M4A89GTD-PRO/USB3, BIOS 3029 07/05/2012
Nov 06 04:19:14 lakshmi kernel: task: ffff93db5adc8000 task.stack:
ffffb03b01d94000
Nov 06 04:19:14 lakshmi kernel: RIP:
0010:locked_inode_to_wb_and_lock_list+0x26/0x110
Nov 06 04:19:14 lakshmi kernel: RSP: 0018:ffffb03b01d97bc8 EFLAGS: 00010292
Nov 06 04:19:14 lakshmi kernel: RAX: 0000000000000000 RBX: 0000000000000000
RCX: ffff93d9758dfe28
Nov 06 04:19:14 lakshmi kernel: RDX: 0000000000000001 RSI: 0000000005080020
RDI: ffff93d9758dea58
Nov 06 04:19:14 lakshmi kernel: RBP: ffffb03b01d97bf0 R08: 0000000000000000
R09: ffff93d9cd655468
Nov 06 04:19:14 lakshmi kernel: R10: 0000000000000228 R11: 0000000000000000
R12: ffff93d9758dea58
Nov 06 04:19:14 lakshmi kernel: R13: ffff93d9758deae0 R14: 0000000000000000
R15: 0000000000000059
Nov 06 04:19:14 lakshmi kernel: FS: 0000000000000000(0000)
GS:ffff93db77c00000(0000) knlGS:0000000000000000
Nov 06 04:19:14 lakshmi kernel: CS: 0010 DS: 0000 ES: 0000 CR0:
0000000080050033
Nov 06 04:19:14 lakshmi kernel: CR2: 0000000000000000 CR3: 00000001d7e08000
CR4: 00000000000006f0
Nov 06 04:19:14 lakshmi kernel: Call Trace:
Nov 06 04:19:14 lakshmi kernel: inode_io_list_del+0x23/0x50
Nov 06 04:19:14 lakshmi kernel: evict+0x55/0x1a0
Nov 06 04:19:14 lakshmi kernel: dispose_list+0x39/0x50
Nov 06 04:19:14 lakshmi kernel: prune_icache_sb+0x5a/0x80
Nov 06 04:19:14 lakshmi kernel: super_cache_scan+0x134/0x1b0
Nov 06 04:19:14 lakshmi kernel: shrink_slab.part.48+0x1d6/0x3d0
Nov 06 04:19:14 lakshmi kernel: shrink_slab+0x1b/0x30
Nov 06 04:19:14 lakshmi kernel: shrink_node+0x11e/0x300
Nov 06 04:19:14 lakshmi kernel: kswapd+0x2cc/0x750
Nov 06 04:19:14 lakshmi kernel: kthread+0x125/0x140
Nov 06 04:19:14 lakshmi kernel: ? mem_cgroup_shrink_node+0x180/0x180
Nov 06 04:19:14 lakshmi kernel: ? kthread_create_on_node+0x70/0x70
Nov 06 04:19:14 lakshmi kernel: ret_from_fork+0x25/0x30
Nov 06 04:19:14 lakshmi kernel: Code: 00 00 00 00 00 0f 1f 44 00 00 55 48 89
e5 41 56 41 55 41 54 53 4c 8d af 88 00 00 00 49 89 fc
Nov 06 04:19:14 lakshmi kernel: RIP:
locked_inode_to_wb_and_lock_list+0x26/0x110 RSP: ffffb03b01d97bc8
Nov 06 04:19:14 lakshmi kernel: CR2: 0000000000000000
Nov 06 04:19:14 lakshmi kernel: ---[ end trace 5aa11bcf674e53cc ]---
ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: linux-image-4.13.0-16-generic 4.13.0-16.19
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: ksta 3322 F.... pulseaudio
/dev/snd/controlC0: ksta 3322 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Mon Nov 6 06:59:50 2017
HibernationDevice: RESUME=/dev/mapper/vg1-swap
InstallationDate: Installed on 2017-11-05 (0 days ago)
InstallationMedia: Ubuntu-Server 17.10 "Artful Aardvark" - Release amd64
(20171017.1)
MachineType: System manufacturer System Product Name
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 nouveaufb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.13.0-16-generic
root=/dev/mapper/vg1-root ro
RelatedPackageVersions:
linux-restricted-modules-4.13.0-16-generic N/A
linux-backports-modules-4.13.0-16-generic N/A
linux-firmware 1.169
RfKill:
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/05/2012
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 3029
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: M4A89GTD-PRO/USB3
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr3029:bd07/05/2012:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM4A89GTD-PRO/USB3:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.family: To Be Filled By O.E.M.
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
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