syzbot


BUG: unable to handle kernel paging request in crc_128

Status: upstream: reported syz repro on 2023/01/05 21:41
Subsystems: xfs
[Documentation on labels]
Reported-by: syzbot+3039b688887067bcffb7@syzkaller.appspotmail.com
First crash: 267d, last: 267d
Fix bisection: failed (error log, bisect log)
  

Sample crash report:
XFS (loop3): Continuing onwards, but if log hangs are experienced then please report this message in the bug report.
XFS (loop3): Torn write (CRC failure) detected at log block 0xffff888091eefa48. Truncating head block from 0x50.
BUG: unable to handle kernel paging request at ffffc900080f4000
PGD 13be43067 P4D 13be43067 PUD 23b831067 PMD a5ff2067 PTE 0
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 25818 Comm: syz-executor.3 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
RIP: 0010:crc_128+0x14/0x1e
Code: 00 00 4c 8d 99 00 0c 00 00 48 81 c1 00 04 00 00 4d 31 c9 4d 31 d2 f2 4c 0f 38 f1 81 00 fc ff ff f2 4c 0f 38 f1 8a 00 fc ff ff <f2> 4d 0f 38 f1 93 00 fc ff ff f2 4c 0f 38 f1 81 08 fc ff ff f2 4c
RSP: 0018:ffff888091eef2b0 EFLAGS: 00010246
RAX: 0000000000000080 RBX: 00000000000087ff RCX: ffffc900080f3c00
RDX: ffffc900080f4000 RSI: 00000000000087ff RDI: ffffffff886862e0
RBP: 000000000000ffff R08: 00000000053b283c R09: 000000002a3791e3
R10: 0000000000000000 R11: ffffc900080f4400 R12: ffff888091eef390
R13: ffffc900080ec000 R14: 0000000000000000 R15: ffff888091eef3c8
FS:  00005555565f3400(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc900080f4000 CR3: 00000000b3fba000 CR4: 00000000003406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
Modules linked in:
CR2: ffffc900080f4000
---[ end trace ad013d673acb2fb5 ]---
RIP: 0010:crc_128+0x14/0x1e
Code: 00 00 4c 8d 99 00 0c 00 00 48 81 c1 00 04 00 00 4d 31 c9 4d 31 d2 f2 4c 0f 38 f1 81 00 fc ff ff f2 4c 0f 38 f1 8a 00 fc ff ff <f2> 4d 0f 38 f1 93 00 fc ff ff f2 4c 0f 38 f1 81 08 fc ff ff f2 4c
RSP: 0018:ffff888091eef2b0 EFLAGS: 00010246
RAX: 0000000000000080 RBX: 00000000000087ff RCX: ffffc900080f3c00
RDX: ffffc900080f4000 RSI: 00000000000087ff RDI: ffffffff886862e0
RBP: 000000000000ffff R08: 00000000053b283c R09: 000000002a3791e3
R10: 0000000000000000 R11: ffffc900080f4400 R12: ffff888091eef390
R13: ffffc900080ec000 R14: 0000000000000000 R15: ffff888091eef3c8
FS:  00005555565f3400(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc900080f4000 CR3: 00000000b3fba000 CR4: 00000000003406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	4c 8d 99 00 0c 00 00 	lea    0xc00(%rcx),%r11
   9:	48 81 c1 00 04 00 00 	add    $0x400,%rcx
  10:	4d 31 c9             	xor    %r9,%r9
  13:	4d 31 d2             	xor    %r10,%r10
  16:	f2 4c 0f 38 f1 81 00 	crc32q -0x400(%rcx),%r8
  1d:	fc ff ff
  20:	f2 4c 0f 38 f1 8a 00 	crc32q -0x400(%rdx),%r9
  27:	fc ff ff
* 2a:	f2 4d 0f 38 f1 93 00 	crc32q -0x400(%r11),%r10 <-- trapping instruction
  31:	fc ff ff
  34:	f2 4c 0f 38 f1 81 08 	crc32q -0x3f8(%rcx),%r8
  3b:	fc ff ff
  3e:	f2                   	repnz
  3f:	4c                   	rex.WR

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/01/05 21:41 linux-4.19.y 3f8a27f9e27b 1dac8c7a .config console log report syz [disk image] [vmlinux] [mounted in repro] ci2-linux-4-19 BUG: unable to handle kernel paging request in crc_128
* Struck through repros no longer work on HEAD.