general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047]
CPU: 1 PID: 5786 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:write_special_inodes fs/jfs/jfs_logmgr.c:208 [inline]
RIP: 0010:jfs_flush_journal+0x97c/0xeb0 fs/jfs/jfs_logmgr.c:1582
Code: 8c b2 fe 4d 8d 75 f0 4c 89 f0 48 c1 e8 03 80 3c 18 00 74 08 4c 89 f7 e8 22 7a dc fe 4d 8b 36 49 83 c6 40 4c 89 f0 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 f7 e8 06 7a dc fe 49 8b 3e e8 4e 8c b2 fe
RSP: 0018:ffffc90004327b20 EFLAGS: 00010202
RAX: 0000000000000008 RBX: dffffc0000000000 RCX: cdce0bab680e9a00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90004327c50 R08: 0000000000000004 R09: 0000000000000004
R10: ffffc90004327a44 R11: fffff52000864f51 R12: 0000000000000000
R13: ffff88814b393038 R14: 0000000000000040 R15: ffff88807d549228
FS: 000055557b2d8500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200001000000 CR3: 0000000063f8c000 CR4: 00000000003506e0
Call Trace:
<TASK>
jfs_umount+0x178/0x3c0 fs/jfs/jfs_umount.c:58
jfs_put_super+0x8c/0x190 fs/jfs/super.c:194
generic_shutdown_super+0x134/0x2b0 fs/super.c:693
kill_block_super+0x44/0x90 fs/super.c:1660
deactivate_locked_super+0x97/0x100 fs/super.c:481
cleanup_mnt+0x429/0x4c0 fs/namespace.c:1250
task_work_run+0x1ce/0x250 kernel/task_work.c:239
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
exit_to_user_mode_prepare+0xf6/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fabaaf901f7
Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffdc0c389d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007fabab011d7d RCX: 00007fabaaf901f7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffdc0c38a90
RBP: 00007ffdc0c38a90 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffdc0c39b20
R13: 00007fabab011d7d R14: 000000000002f6ab R15: 00007ffdc0c39b60
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:write_special_inodes fs/jfs/jfs_logmgr.c:208 [inline]
RIP: 0010:jfs_flush_journal+0x97c/0xeb0 fs/jfs/jfs_logmgr.c:1582
Code: 8c b2 fe 4d 8d 75 f0 4c 89 f0 48 c1 e8 03 80 3c 18 00 74 08 4c 89 f7 e8 22 7a dc fe 4d 8b 36 49 83 c6 40 4c 89 f0 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 f7 e8 06 7a dc fe 49 8b 3e e8 4e 8c b2 fe
RSP: 0018:ffffc90004327b20 EFLAGS: 00010202
RAX: 0000000000000008 RBX: dffffc0000000000 RCX: cdce0bab680e9a00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90004327c50 R08: 0000000000000004 R09: 0000000000000004
R10: ffffc90004327a44 R11: fffff52000864f51 R12: 0000000000000000
R13: ffff88814b393038 R14: 0000000000000040 R15: ffff88807d549228
FS: 000055557b2d8500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055be916e1000 CR3: 0000000063f8c000 CR4: 00000000003506f0
----------------
Code disassembly (best guess):
0: 8c b2 fe 4d 8d 75 mov %?,0x758d4dfe(%rdx)
6: f0 4c 89 f0 lock mov %r14,%rax
a: 48 c1 e8 03 shr $0x3,%rax
e: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1)
12: 74 08 je 0x1c
14: 4c 89 f7 mov %r14,%rdi
17: e8 22 7a dc fe call 0xfedc7a3e
1c: 4d 8b 36 mov (%r14),%r14
1f: 49 83 c6 40 add $0x40,%r14
23: 4c 89 f0 mov %r14,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) <-- trapping instruction
2e: 74 08 je 0x38
30: 4c 89 f7 mov %r14,%rdi
33: e8 06 7a dc fe call 0xfedc7a3e
38: 49 8b 3e mov (%r14),%rdi
3b: e8 4e 8c b2 fe call 0xfeb28c8e