Oops: general protection fault, probably for non-canonical address 0xdffffc0000000011: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000088-0x000000000000008f]
CPU: 1 UID: 0 PID: 55 Comm: kworker/1:1H Not tainted 6.16.0-rc5-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: gfs2-glock/syz:syz glock_work_func
RIP: 0010:__gfs2_trans_begin+0x3a6/0x890 fs/gfs2/trans.c:73
Code: 09 00 00 4c 89 e8 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 ef e8 eb d7 2a fe 41 bf 8c 00 00 00 4d 03 7d 00 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 03 04 00 00 45 8b 3f 89 df 44 89 fe e8
RSP: 0018:ffffc9000130f6c0 EFLAGS: 00010217
RAX: 0000000000000011 RBX: 0000000000000004 RCX: ffff88801b768000
RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffffc9000130f878
RBP: ffffc9000130f7b0 R08: ffff888031ee00af R09: 1ffff110063dc015
R10: dffffc0000000000 R11: ffffed10063dc016 R12: dffffc0000000000
R13: ffff888031ee0900 R14: ffffc9000130f800 R15: 000000000000008c
FS: 0000000000000000(0000) GS:ffff888125d1d000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f831a7b7bac CR3: 000000005796a000 CR4: 0000000000350ef0
Call Trace:
<TASK>
gfs2_ail_empty_gl+0x12b/0x2f0 fs/gfs2/glops.c:129
inode_go_sync+0x462/0x5d0 fs/gfs2/glops.c:335
do_xmote+0x506/0x1220 fs/gfs2/glock.c:731
glock_work_func+0x2a8/0x580 fs/gfs2/glock.c:1096
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3321
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__gfs2_trans_begin+0x3a6/0x890 fs/gfs2/trans.c:73
Code: 09 00 00 4c 89 e8 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 ef e8 eb d7 2a fe 41 bf 8c 00 00 00 4d 03 7d 00 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 03 04 00 00 45 8b 3f 89 df 44 89 fe e8
RSP: 0018:ffffc9000130f6c0 EFLAGS: 00010217
RAX: 0000000000000011 RBX: 0000000000000004 RCX: ffff88801b768000
RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffffc9000130f878
RBP: ffffc9000130f7b0 R08: ffff888031ee00af R09: 1ffff110063dc015
R10: dffffc0000000000 R11: ffffed10063dc016 R12: dffffc0000000000
R13: ffff888031ee0900 R14: ffffc9000130f800 R15: 000000000000008c
FS: 0000000000000000(0000) GS:ffff888125d1d000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000004c0 CR3: 000000005dcf2000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
0: 09 00 or %eax,(%rax)
2: 00 4c 89 e8 add %cl,-0x18(%rcx,%rcx,4)
6: 48 c1 e8 03 shr $0x3,%rax
a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1)
f: 74 08 je 0x19
11: 4c 89 ef mov %r13,%rdi
14: e8 eb d7 2a fe call 0xfe2ad804
19: 41 bf 8c 00 00 00 mov $0x8c,%r15d
1f: 4d 03 7d 00 add 0x0(%r13),%r15
23: 4c 89 f8 mov %r15,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 0f b6 04 20 movzbl (%rax,%r12,1),%eax <-- trapping instruction
2f: 84 c0 test %al,%al
31: 0f 85 03 04 00 00 jne 0x43a
37: 45 8b 3f mov (%r15),%r15d
3a: 89 df mov %ebx,%edi
3c: 44 89 fe mov %r15d,%esi
3f: e8 .byte 0xe8