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
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