Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] SMP KASA[  154.804080][  T122] 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: 122 Comm: jfsCommit Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:write_special_inodes fs/jfs/jfs_logmgr.c:207 [inline]
RIP: 0010:lmLogSync+0x111/0x9f0 fs/jfs/jfs_logmgr.c:935
Code: 17 71 fe 4d 8d 7e d8 4c 89 f8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ff e8 1d 33 d7 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 01 33 d7 fe 49 8b 3f e8 19 9a ab fe
RSP: 0018:ffffc900039afb80 EFLAGS: 00010206
RAX: 0000000000000006 RBX: dffffc0000000000 RCX: ffff88801e758000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900039afc88 R08: 0000000000000000 R09: 0000000000000000
R10: ffffc900039afbe0 R11: fffff52000735f80 R12: 0000000000000001
R13: ffff888061455800 R14: ffff8880247bc838 R15: 0000000000000030
FS:  0000000000000000(0000) GS:ffff88812633f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9ee7ac0000 CR3: 000000005e07c000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 jfs_syncpt+0x7b/0x90 fs/jfs/jfs_logmgr.c:1041
 txEnd+0x2e5/0x530 fs/jfs/jfs_txnmgr.c:550
 txLazyCommit fs/jfs/jfs_txnmgr.c:2685 [inline]
 jfs_lazycommit+0x55a/0xa10 fs/jfs/jfs_txnmgr.c:2734
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x51e/0xb90 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 fs/jfs/jfs_logmgr.c:207 [inline]
RIP: 0010:lmLogSync+0x111/0x9f0 fs/jfs/jfs_logmgr.c:935
Code: 17 71 fe 4d 8d 7e d8 4c 89 f8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ff e8 1d 33 d7 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 01 33 d7 fe 49 8b 3f e8 19 9a ab fe
RSP: 0018:ffffc900039afb80 EFLAGS: 00010206
RAX: 0000000000000006 RBX: dffffc0000000000 RCX: ffff88801e758000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900039afc88 R08: 0000000000000000 R09: 0000000000000000
R10: ffffc900039afbe0 R11: fffff52000735f80 R12: 0000000000000001
R13: ffff888061455800 R14: ffff8880247bc838 R15: 0000000000000030
FS:  0000000000000000(0000) GS:ffff88812643f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9ee7ac3000 CR3: 0000000039250000 CR4: 00000000003526f0
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	71 fe                	jno    0x0
   2:	4d 8d 7e d8          	lea    -0x28(%r14),%r15
   6:	4c 89 f8             	mov    %r15,%rax
   9:	48 c1 e8 03          	shr    $0x3,%rax
   d:	80 3c 18 00          	cmpb   $0x0,(%rax,%rbx,1)
  11:	74 08                	je     0x1b
  13:	4c 89 ff             	mov    %r15,%rdi
  16:	e8 1d 33 d7 fe       	call   0xfed73338
  1b:	4d 8b 3f             	mov    (%r15),%r15
  1e:	49 83 c7 30          	add    $0x30,%r15
  22:	4c 89 f8             	mov    %r15,%rax
  25:	48 c1 e8 03          	shr    $0x3,%rax
* 29:	80 3c 18 00          	cmpb   $0x0,(%rax,%rbx,1) <-- trapping instruction
  2d:	74 08                	je     0x37
  2f:	4c 89 ff             	mov    %r15,%rdi
  32:	e8 01 33 d7 fe       	call   0xfed73338
  37:	49 8b 3f             	mov    (%r15),%rdi
  3a:	e8 19 9a ab fe       	call   0xfeab9a58