Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 UID: 0 PID: 127 Comm: jfsCommit Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:metapage_write_folio+0xa2/0xd40 fs/jfs/jfs_metapage.c:429
Code: f3 e8 c2 1f 6d fe 4c 8d 73 18 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 08 47 d4 fe 4d 8b 36 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 0[  522.593961][  T127] Code: f3 e8 c2 1f 6d fe 4c 8d 73 18 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 08 47 d4 fe 4d 8b 36 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 ef 46 d4 fe 49 8b 06 48 89 44 24
RSP: 0018:ffffc9000392f880 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffea0000d88300 RCX: ffff88801e389ec0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000392f990 R08: ffffea0000d88337 R09: 1ffffd40001b1066
R10: dffffc0000000000 R11: fffff940001b1067 R12: 1ffff92000725f1c
R13: ffffea0000d88300 R14: 0000000000000000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881264a1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffddecbd750 CR3: 000000003d5e8000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 metapage_write_one+0x2c4/0x520 fs/jfs/jfs_metapage.c:819
 release_metapage+0x57e/0xa50 fs/jfs/jfs_metapage.c:885
 txUnlock+0x50b/0xdb0 fs/jfs/jfs_txnmgr.c:949
 txLazyCommit fs/jfs/jfs_txnmgr.c:2684 [inline]
 jfs_lazycommit+0x533/0xa20 fs/jfs/jfs_txnmgr.c:2735
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 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:metapage_write_folio+0xa2/0xd40 fs/jfs/jfs_metapage.c:429
Code: f3 e8 c2 1f 6d fe 4c 8d 73 18 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 08 47 d4 fe 4d 8b 36 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 ef 46 d4 fe 49 8b 06 48 89 44 24
RSP: 0018:ffffc9000392f880 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffea0000d88300 RCX: ffff88801e389ec0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000392f990 R08: ffffea0000d88337 R09: 1ffffd40001b1066
R10: dffffc0000000000 R11: fffff940001b1067 R12: 1ffff92000725f1c
R13: ffffea0000d88300 R14: 0000000000000000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881264a1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffddecbd750 CR3: 000000003d5e8000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	f3 e8 c2 1f 6d fe    	repz call 0xfe6d1fc8
   6:	4c 8d 73 18          	lea    0x18(%rbx),%r14
   a:	4c 89 f0             	mov    %r14,%rax
   d:	48 c1 e8 03          	shr    $0x3,%rax
  11:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1)
  16:	74 08                	je     0x20
  18:	4c 89 f7             	mov    %r14,%rdi
  1b:	e8 08 47 d4 fe       	call   0xfed44728
  20:	4d 8b 36             	mov    (%r14),%r14
  23:	4c 89 f0             	mov    %r14,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	4c 89 f7             	mov    %r14,%rdi
  34:	e8 ef 46 d4 fe       	call   0xfed44728
  39:	49 8b 06             	mov    (%r14),%rax
  3c:	48                   	rex.W
  3d:	89                   	.byte 0x89
  3e:	44                   	rex.R
  3f:	24                   	.byte 0x24