general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
CPU: 0 PID: 6314 Comm: syz.3.702 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:write_special_inodes fs/jfs/jfs_logmgr.c:208 [inline]
RIP: 0010:lmLogSync+0x22d/0x9e0 fs/jfs/jfs_logmgr.c:945
Code: 64 cc fe 4d 8d 7e f0 4c 89 f8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ff e8 a1 6d ec fe 4d 8b 3f 49 83 c7 30 4c 89 f8 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 ff e8 85 6d ec fe 49 8b 3f e8 ad 64 cc fe
RSP: 0000:ffffc900033cf780 EFLAGS: 00010206
RAX: 0000000000000006 RBX: dffffc0000000000 RCX: 6421ef90c00aae00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900033cf898 R08: ffffc900033cf6ff R09: ffffc900033cf6c0
R10: dffffc0000000000 R11: fffff52000679ee0 R12: dffffc0000000000
R13: ffff88805c083800 R14: ffff88802afcc838 R15: 0000000000000030
FS:  0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f862cb67000 CR3: 0000000051693000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 jfs_syncpt+0x77/0x90 fs/jfs/jfs_logmgr.c:1049
 jfs_sync_fs+0x83/0xa0 fs/jfs/super.c:690
 sync_filesystem+0xe6/0x220 fs/sync.c:56
 generic_shutdown_super+0x6b/0x300 fs/super.c:448
 kill_block_super+0x7c/0xe0 fs/super.c:1427
 deactivate_locked_super+0x93/0xf0 fs/super.c:335
 cleanup_mnt+0x42d/0x4e0 fs/namespace.c:1148
 task_work_run+0x125/0x1a0 kernel/task_work.c:188
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0x626/0x20c0 kernel/exit.c:883
 do_group_exit+0x12e/0x300 kernel/exit.c:997
 get_signal+0x6ca/0x12c0 kernel/signal.c:2900
 arch_do_signal_or_restart+0xe7/0x12c0 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:154 [inline]
 exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7feec5c33a8a
Code: Unable to access opcode bytes at RIP 0x7feec5c33a60.
RSP: 002b:00007feec3e8be58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: 0000000000000000 RBX: 00007feec3e8bee0 RCX: 00007feec5c33a8a
RDX: 0000200000000040 RSI: 0000200000000000 RDI: 00007feec3e8bea0
RBP: 0000200000000040 R08: 00007feec3e8bee0 R09: 0000000000008800
R10: 0000000000008800 R11: 0000000000000246 R12: 0000200000000000
R13: 00007feec3e8bea0 R14: 000000000000617a R15: 00002000000002c0
 </TASK>
Modules linked in:
---[ end trace bf990c9cf7d91d81 ]---
RIP: 0010:write_special_inodes fs/jfs/jfs_logmgr.c:208 [inline]
RIP: 0010:lmLogSync+0x22d/0x9e0 fs/jfs/jfs_logmgr.c:945
Code: 64 cc fe 4d 8d 7e f0 4c 89 f8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ff e8 a1 6d ec fe 4d 8b 3f 49 83 c7 30 4c 89 f8 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 ff e8 85 6d ec fe 49 8b 3f e8 ad 64 cc fe
RSP: 0000:ffffc900033cf780 EFLAGS: 00010206
RAX: 0000000000000006 RBX: dffffc0000000000 RCX: 6421ef90c00aae00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900033cf898 R08: ffffc900033cf6ff R09: ffffc900033cf6c0
R10: dffffc0000000000 R11: fffff52000679ee0 R12: dffffc0000000000
R13: ffff88805c083800 R14: ffff88802afcc838 R15: 0000000000000030
FS:  0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055ce2bdbd138 CR3: 0000000072dd5000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	64 cc                	fs int3
   2:	fe 4d 8d             	decb   -0x73(%rbp)
   5:	7e f0                	jle    0xfffffff7
   7:	4c 89 f8             	mov    %r15,%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 ff             	mov    %r15,%rdi
  17:	e8 a1 6d ec fe       	call   0xfeec6dbd
  1c:	4d 8b 3f             	mov    (%r15),%r15
  1f:	49 83 c7 30          	add    $0x30,%r15
  23:	4c 89 f8             	mov    %r15,%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 ff             	mov    %r15,%rdi
  33:	e8 85 6d ec fe       	call   0xfeec6dbd
  38:	49 8b 3f             	mov    (%r15),%rdi
  3b:	e8 ad 64 cc fe       	call   0xfecc64ed