general protection fault, probably for non-canonical address 0xdffffc0000000097: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x00000000000004b8-0x00000000000004bf]
CPU: 0 PID: 93 Comm: kworker/0:1H Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: glock_workqueue glock_work_func
RIP: 0010:is_system_glock fs/gfs2/glock.c:724 [inline]
RIP: 0010:do_xmote+0xdd3/0x13c0 fs/gfs2/glock.c:833
Code: ff df 80 3c 08 00 74 08 4c 89 f7 e8 f7 9d 3e fe 41 bf b8 04 00 00 4d 03 3e 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ff e8 cf 9d 3e fe 49 3b 1f 0f 84 af 00 00
RSP: 0018:ffffc90002567b80 EFLAGS: 00010202
RAX: 0000000000000097 RBX: ffff888066e50548 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000004000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff88807b6ac0af R09: 1ffff1100f6d5815
R10: dffffc0000000000 R11: ffffed100f6d5816 R12: dffffc0000000000
R13: 1ffff1100f6d5815 R14: ffff88807b6ac718 R15: 00000000000004b8
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31e21ff8 CR3: 000000007e985000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 glock_work_func+0x25e/0x470 fs/gfs2/glock.c:1089
 process_one_work+0x8a2/0x1160 kernel/workqueue.c:2292
 worker_thread+0xaa2/0x1270 kernel/workqueue.c:2439
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:is_system_glock fs/gfs2/glock.c:724 [inline]
RIP: 0010:do_xmote+0xdd3/0x13c0 fs/gfs2/glock.c:833
Code: ff df 80 3c 08 00 74 08 4c 89 f7 e8 f7 9d 3e fe 41 bf b8 04 00 00 4d 03 3e 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ff e8 cf 9d 3e fe 49 3b 1f 0f 84 af 00 00
RSP: 0018:ffffc90002567b80 EFLAGS: 00010202
RAX: 0000000000000097 RBX: ffff888066e50548 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000004000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff88807b6ac0af R09: 1ffff1100f6d5815
R10: dffffc0000000000 R11: ffffed100f6d5816 R12: dffffc0000000000
R13: 1ffff1100f6d5815 R14: ffff88807b6ac718 R15: 00000000000004b8
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31e21ff8 CR3: 000000007e952000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	ff                   	lcall  (bad)
   1:	df 80 3c 08 00 74    	filds  0x7400083c(%rax)
   7:	08 4c 89 f7          	or     %cl,-0x9(%rcx,%rcx,4)
   b:	e8 f7 9d 3e fe       	call   0xfe3e9e07
  10:	41 bf b8 04 00 00    	mov    $0x4b8,%r15d
  16:	4d 03 3e             	add    (%r14),%r15
  19:	4c 89 f8             	mov    %r15,%rax
  1c:	48 c1 e8 03          	shr    $0x3,%rax
  20:	48 b9 00 00 00 00 00 	movabs $0xdffffc0000000000,%rcx
  27:	fc ff df
* 2a:	80 3c 08 00          	cmpb   $0x0,(%rax,%rcx,1) <-- trapping instruction
  2e:	74 08                	je     0x38
  30:	4c 89 ff             	mov    %r15,%rdi
  33:	e8 cf 9d 3e fe       	call   0xfe3e9e07
  38:	49 3b 1f             	cmp    (%r15),%rbx
  3b:	0f                   	.byte 0xf
  3c:	84                   	.byte 0x84
  3d:	af                   	scas   %es:(%rdi),%eax