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: 1214 Comm: kworker/0:1H Not tainted 6.1.0-rc2-syzkaller-00070-g4dc12f37a8e9 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Workqueue: glock_workqueue glock_work_func RIP: 0010:is_system_glock fs/gfs2/glock.c:725 [inline] RIP: 0010:do_xmote+0x48b/0xc40 fs/gfs2/glock.c:835 Code: 03 80 3c 02 00 0f 85 3d 07 00 00 4d 8b b6 18 07 00 00 48 b8 00 00 00 00 00 fc ff df 49 8d be b8 04 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 fb 06 00 00 49 3b ae b8 04 00 00 0f 84 8a 05 00 RSP: 0018:ffffc900070cfc50 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff888071294000 RCX: 0000000000000000 RDX: 0000000000000097 RSI: ffffffff838942f9 RDI: 00000000000004b8 RBP: ffff888063398fd8 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: ffffea00012c4f00 R12: 0000000000000000 R13: ffff888063398ff8 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88802c800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000f734b4f0 CR3: 000000006e69c000 CR4: 0000000000150ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: run_queue+0x3cf/0x660 fs/gfs2/glock.c:914 glock_work_func+0xbe/0x3a0 fs/gfs2/glock.c:1082 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:is_system_glock fs/gfs2/glock.c:725 [inline] RIP: 0010:do_xmote+0x48b/0xc40 fs/gfs2/glock.c:835 Code: 03 80 3c 02 00 0f 85 3d 07 00 00 4d 8b b6 18 07 00 00 48 b8 00 00 00 00 00 fc ff df 49 8d be b8 04 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 fb 06 00 00 49 3b ae b8 04 00 00 0f 84 8a 05 00 RSP: 0018:ffffc900070cfc50 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff888071294000 RCX: 0000000000000000 RDX: 0000000000000097 RSI: ffffffff838942f9 RDI: 00000000000004b8 RBP: ffff888063398fd8 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: ffffea00012c4f00 R12: 0000000000000000 R13: ffff888063398ff8 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88802c800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000f734b4f0 CR3: 000000006e69c000 CR4: 0000000000150ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 03 80 3c 02 00 0f add 0xf00023c(%rax),%eax 6: 85 3d 07 00 00 4d test %edi,0x4d000007(%rip) # 0x4d000013 c: 8b b6 18 07 00 00 mov 0x718(%rsi),%esi 12: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 19: fc ff df 1c: 49 8d be b8 04 00 00 lea 0x4b8(%r14),%rdi 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 fb 06 00 00 jne 0x72f 34: 49 3b ae b8 04 00 00 cmp 0x4b8(%r14),%rbp 3b: 0f .byte 0xf 3c: 84 .byte 0x84 3d: 8a .byte 0x8a 3e: 05 .byte 0x5