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: 150 Comm: kworker/0:1H Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: glock_workqueue glock_work_func
RIP: 0010:is_system_glock fs/gfs2/glock.c:693 [inline]
RIP: 0010:do_xmote+0xd87/0x1120 fs/gfs2/glock.c:801
Code: ff df 80 3c 08 00 74 08 4c 89 ff e8 83 c2 51 fe 41 bc b8 04 00 00 4d 03 27 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 e7 e8 5b c2 51 fe 49 3b 1c 24 74 38 48 8b
RSP: 0018:ffffc9000148fb70 EFLAGS: 00010202
RAX: 0000000000000097 RBX: ffff8880791f0548 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000004000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff8880794980af R09: 1ffff1100f293015
R10: dffffc0000000000 R11: ffffed100f293016 R12: 00000000000004b8
R13: 000000000000208a R14: 0000000000004000 R15: ffff888079498718
FS:  0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32a1fff8 CR3: 000000007eb95000 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:1039
 process_one_work+0x85f/0x1010 kernel/workqueue.c:2310
 worker_thread+0xaa6/0x1290 kernel/workqueue.c:2457
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
Modules linked in:
---[ end trace b2413f74e68c36b6 ]---
RIP: 0010:is_system_glock fs/gfs2/glock.c:693 [inline]
RIP: 0010:do_xmote+0xd87/0x1120 fs/gfs2/glock.c:801
Code: ff df 80 3c 08 00 74 08 4c 89 ff e8 83 c2 51 fe 41 bc b8 04 00 00 4d 03 27 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 e7 e8 5b c2 51 fe 49 3b 1c 24 74 38 48 8b
RSP: 0018:ffffc9000148fb70 EFLAGS: 00010202
RAX: 0000000000000097 RBX: ffff8880791f0548 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000004000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff8880794980af R09: 1ffff1100f293015
R10: dffffc0000000000 R11: ffffed100f293016 R12: 00000000000004b8
R13: 000000000000208a R14: 0000000000004000 R15: ffff888079498718
FS:  0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7aaa87a4c0 CR3: 000000007eb95000 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 ff          	or     %cl,-0x1(%rcx,%rcx,4)
   b:	e8 83 c2 51 fe       	call   0xfe51c293
  10:	41 bc b8 04 00 00    	mov    $0x4b8,%r12d
  16:	4d 03 27             	add    (%r15),%r12
  19:	4c 89 e0             	mov    %r12,%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 e7             	mov    %r12,%rdi
  33:	e8 5b c2 51 fe       	call   0xfe51c293
  38:	49 3b 1c 24          	cmp    (%r12),%rbx
  3c:	74 38                	je     0x76
  3e:	48                   	rex.W
  3f:	8b                   	.byte 0x8b