Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
CPU: 0 UID: 0 PID: 109 Comm: jfsCommit Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
RIP: 0010:write_special_inodes+0x71/0x180 fs/jfs/jfs_logmgr.c:207
Code: df e8 b3 c8 6a fe 48 8d 7b 10 48 89 f8 48 c1 e8 03 80 3c 28 00 0f 85 c5 00 00 00 4c 8b 6b 10 49 8d 7d 30 48 89 f8 48 c1 e8 03 <80> 3c 28 00 0f 85 df 00 00 00 49 8b 7d 30 2e e8 5b 0a e2 07 48 8d
RSP: 0018:ffffc90002d57bc8 EFLAGS: 00010216
RAX: 0000000000000006 RBX: ffff8880314a6600 RCX: ffffffff839cd116
RDX: ffff88801eb28000 RSI: ffffffff839c446d RDI: 0000000000000030
RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff823f4a50
R13: 0000000000000000 R14: ffff888026359000 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff8881245ab000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f253454da08 CR3: 000000006d090000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 lmLogSync+0xd2/0x7b0 fs/jfs/jfs_logmgr.c:935
 jfs_syncpt+0x89/0xa0 fs/jfs/jfs_logmgr.c:1041
 txEnd+0x318/0x490 fs/jfs/jfs_txnmgr.c:550
 txLazyCommit fs/jfs/jfs_txnmgr.c:2685 [inline]
 jfs_lazycommit+0x748/0xab0 fs/jfs/jfs_txnmgr.c:2734
 kthread+0x370/0x450 kernel/kthread.c:467
 ret_from_fork+0x754/0xd80 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:write_special_inodes+0x71/0x180 fs/jfs/jfs_logmgr.c:207
Code: df e8 b3 c8 6a fe 48 8d 7b 10 48 89 f8 48 c1 e8 03 80 3c 28 00 0f 85 c5 00 00 00 4c 8b 6b 10 49 8d 7d 30 48 89 f8 48 c1 e8 03 <80> 3c 28 00 0f 85 df 00 00 00 49 8b 7d 30 2e e8 5b 0a e2 07 48 8d
RSP: 0018:ffffc90002d57bc8 EFLAGS: 00010216
RAX: 0000000000000006 RBX: ffff8880314a6600 RCX: ffffffff839cd116
RDX: ffff88801eb28000 RSI: ffffffff839c446d RDI: 0000000000000030
RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff823f4a50
R13: 0000000000000000 R14: ffff888026359000 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff8881245ab000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30b11ff8 CR3: 0000000079f53000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
   0:	df e8                	fucomip %st(0),%st
   2:	b3 c8                	mov    $0xc8,%bl
   4:	6a fe                	push   $0xfffffffffffffffe
   6:	48 8d 7b 10          	lea    0x10(%rbx),%rdi
   a:	48 89 f8             	mov    %rdi,%rax
   d:	48 c1 e8 03          	shr    $0x3,%rax
  11:	80 3c 28 00          	cmpb   $0x0,(%rax,%rbp,1)
  15:	0f 85 c5 00 00 00    	jne    0xe0
  1b:	4c 8b 6b 10          	mov    0x10(%rbx),%r13
  1f:	49 8d 7d 30          	lea    0x30(%r13),%rdi
  23:	48 89 f8             	mov    %rdi,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	80 3c 28 00          	cmpb   $0x0,(%rax,%rbp,1) <-- trapping instruction
  2e:	0f 85 df 00 00 00    	jne    0x113
  34:	49 8b 7d 30          	mov    0x30(%r13),%rdi
  38:	2e e8 5b 0a e2 07    	cs call 0x7e20a99
  3e:	48                   	rex.W
  3f:	8d                   	.byte 0x8d