syzbot

Oops: general protection fault, probably for non-canonical address 0xdffffc0000000053: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000298-0x000000000000029f]
CPU: 0 UID: 0 PID: 121 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:kasan_byte_accessible+0x12/0x30 mm/kasan/generic.c:210
Code: 79 ff ff ff 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6 48 c1 ef 03 48 b8 00 00 00 00 00 fc ff df <0f> b6 04 07 3c 08 0f 92 c0 c3 cc cc cc cc cc 66 66 66 66 66 66 2e
RSP: 0018:ffffc900039a7ba8 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffffffff8b2420f3 RCX: 0000000080000001
RDX: 0000000000000000 RSI: ffffffff8b2420f3 RDI: 0000000000000053
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: ffffc900039a7cb0 R11: fffff52000734f98 R12: 0000000000000000
R13: 0000000000000298 R14: 0000000000000298 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888126343000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056396077d6b8 CR3: 00000000448a8000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __kasan_check_byte+0x12/0x40 mm/kasan/common.c:573
 kasan_check_byte include/linux/kasan.h:402 [inline]
 lock_acquire+0x79/0x2e0 kernel/locking/lockdep.c:5842
 rt_spin_lock+0x83/0x400 kernel/locking/spinlock_rt.c:56
 spin_lock_irq include/linux/spinlock_rt.h:96 [inline]
 txLazyCommit fs/jfs/jfs_txnmgr.c:2669 [inline]
 jfs_lazycommit+0x455/0xa10 fs/jfs/jfs_txnmgr.c:2734
 kthread+0x388/0x470 kernel/kthread.c:467
 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:kasan_byte_accessible+0x12/0x30 mm/kasan/generic.c:210
Code: 79 ff ff ff 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6 48 c1 ef 03 48 b8 00 00 00 00 00 fc ff df <0f> b6 04 07 3c 08 0f 92 c0 c3 cc cc cc cc cc 66 66 66 66 66 66 2e
RSP: 0018:ffffc900039a7ba8 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffffffff8b2420f3 RCX: 0000000080000001
RDX: 0000000000000000 RSI: ffffffff8b2420f3 RDI: 0000000000000053
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: ffffc900039a7cb0 R11: fffff52000734f98 R12: 0000000000000000
R13: 0000000000000298 R14: 0000000000000298 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888126343000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056396077d6b8 CR3: 00000000448a8000 CR4: 00000000003526f0
----------------
Code disassembly (best guess), 4 bytes skipped:
   0:	0f 1f 40 00          	nopl   0x0(%rax)
   4:	90                   	nop
   5:	90                   	nop
   6:	90                   	nop
   7:	90                   	nop
   8:	90                   	nop
   9:	90                   	nop
   a:	90                   	nop
   b:	90                   	nop
   c:	90                   	nop
   d:	90                   	nop
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	0f 1f 40 d6          	nopl   -0x2a(%rax)
  18:	48 c1 ef 03          	shr    $0x3,%rdi
  1c:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  23:	fc ff df
* 26:	0f b6 04 07          	movzbl (%rdi,%rax,1),%eax <-- trapping instruction
  2a:	3c 08                	cmp    $0x8,%al
  2c:	0f 92 c0             	setb   %al
  2f:	c3                   	ret
  30:	cc                   	int3
  31:	cc                   	int3
  32:	cc                   	int3
  33:	cc                   	int3
  34:	cc                   	int3
  35:	66                   	data16
  36:	66                   	data16
  37:	66                   	data16
  38:	66                   	data16
  39:	66                   	data16
  3a:	66                   	data16
  3b:	2e                   	cs