Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
CPU: 0 UID: 0 PID: 112 Comm: jfsCommit Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:write_special_inodes fs/jfs/jfs_logmgr.c:208 [inline]
RIP: 0010:lmLogSync+0x138/0x9d0 fs/jfs/jfs_logmgr.c:935
Code: 94 b4 fe 4d 8d 7e f0 4c 89 f8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ff e8 b6 d7 e1 fe 4d 8b 3f 49 83 c7 30 4c 89 f8 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 ff e8 9a d7 e1 fe 49 8b 3f e8 a2 94 b4 fe
RSP: 0000:ffffc90002d77b00 EFLAGS: 00010206
RAX: 0000000000000006 RBX: dffffc0000000000 RCX: ffff88801e7a5a00
RDX: 0000000000000000 RSI: 000000000000000a RDI: ffffc90002d778e0
RBP: ffffc90002d77c08 R08: ffff88801e7a5a00 R09: 0000000000000003
R10: 0000000000000406 R11: 0000000000000000 R12: ffff8880216b6000
R13: dffffc0000000000 R14: ffff888024f33a38 R15: 0000000000000030
FS:  0000000000000000(0000) GS:ffff888125a05000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7d99cab000 CR3: 0000000059426000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 jfs_syncpt+0x7b/0x90 fs/jfs/jfs_logmgr.c:1041
 txEnd+0x2e5/0x530 fs/jfs/jfs_txnmgr.c:549
 txLazyCommit fs/jfs/jfs_txnmgr.c:2684 [inline]
 jfs_lazycommit+0x5ba/0xa90 fs/jfs/jfs_txnmgr.c:2733
 kthread+0x70e/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148
 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 fs/jfs/jfs_logmgr.c:208 [inline]
RIP: 0010:lmLogSync+0x138/0x9d0 fs/jfs/jfs_logmgr.c:935
Code: 94 b4 fe 4d 8d 7e f0 4c 89 f8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ff e8 b6 d7 e1 fe 4d 8b 3f 49 83 c7 30 4c 89 f8 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 ff e8 9a d7 e1 fe 49 8b 3f e8 a2 94 b4 fe
RSP: 0000:ffffc90002d77b00 EFLAGS: 00010206
RAX: 0000000000000006 RBX: dffffc0000000000 RCX: ffff88801e7a5a00
RDX: 0000000000000000 RSI: 000000000000000a RDI: ffffc90002d778e0
RBP: ffffc90002d77c08 R08: ffff88801e7a5a00 R09: 0000000000000003
R10: 0000000000000406 R11: 0000000000000000 R12: ffff8880216b6000
R13: dffffc0000000000 R14: ffff888024f33a38 R15: 0000000000000030
FS:  0000000000000000(0000) GS:ffff888125a05000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2b7896c000 CR3: 00000000619a6000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	94                   	xchg   %eax,%esp
   1:	b4 fe                	mov    $0xfe,%ah
   3:	4d 8d 7e f0          	lea    -0x10(%r14),%r15
   7:	4c 89 f8             	mov    %r15,%rax
   a:	48 c1 e8 03          	shr    $0x3,%rax
   e:	80 3c 18 00          	cmpb   $0x0,(%rax,%rbx,1)
  12:	74 08                	je     0x1c
  14:	4c 89 ff             	mov    %r15,%rdi
  17:	e8 b6 d7 e1 fe       	call   0xfee1d7d2
  1c:	4d 8b 3f             	mov    (%r15),%r15
  1f:	49 83 c7 30          	add    $0x30,%r15
  23:	4c 89 f8             	mov    %r15,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	80 3c 18 00          	cmpb   $0x0,(%rax,%rbx,1) <-- trapping instruction
  2e:	74 08                	je     0x38
  30:	4c 89 ff             	mov    %r15,%rdi
  33:	e8 9a d7 e1 fe       	call   0xfee1d7d2
  38:	49 8b 3f             	mov    (%r15),%rdi
  3b:	e8 a2 94 b4 fe       	call   0xfeb494e2