syzbot

Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
CPU: 1 UID: 0 PID: 5950 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:write_special_inodes fs/jfs/jfs_logmgr.c:208 [inline]
RIP: 0010:jfs_flush_journal+0x7f8/0xed0 fs/jfs/jfs_logmgr.c:1572
Code: ab b0 fe 4d 8d 77 f0 4c 89 f0 48 c1 e8 03 80 3c 18 00 74 08 4c 89 f7 e8 f6 b9 de fe 4d 8b 26 49 83 c4 30 4c 89 e0 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 e7 e8 da b9 de fe 49 8b 3c 24 e8 a1 ab b0
RSP: 0018:ffffc900041bfb20 EFLAGS: 00010216
RAX: 0000000000000006 RBX: dffffc0000000000 RCX: ffff8880268d5ac0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900041bfc50 R08: ffffc900041bfa6f R09: ffffc900041bf908
R10: dffffc0000000000 R11: fffff52000837f4e R12: 0000000000000030
R13: ffff888027b4c1a8 R14: ffff8880790b9a28 R15: ffff8880790b9a38
FS:  000055557244b500(0000) GS:ffff88812623b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff0c3ee5000 CR3: 0000000030b09000 CR4: 0000000000350ef0
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+0x135/0x2c0 fs/super.c:642
 kill_block_super+0x44/0x90 fs/super.c:1722
 deactivate_locked_super+0xbc/0x130 fs/super.c:473
 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1327
 task_work_run+0x1d4/0x260 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop+0xe9/0x130 kernel/entry/common.c:43
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x2bd/0xfa0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa7843909f7
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:00007ffe874acef8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007fa784411d7d RCX: 00007fa7843909f7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffe874acfb0
RBP: 00007ffe874acfb0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffe874ae040
R13: 00007fa784411d7d R14: 00000000000241d1 R15: 00007ffe874ae080
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:write_special_inodes fs/jfs/jfs_logmgr.c:208 [inline]
RIP: 0010:jfs_flush_journal+0x7f8/0xed0 fs/jfs/jfs_logmgr.c:1572
Code: ab b0 fe 4d 8d 77 f0 4c 89 f0 48 c1 e8 03 80 3c 18 00 74 08 4c 89 f7 e8 f6 b9 de fe 4d 8b 26 49 83 c4 30 4c 89 e0 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 e7 e8 da b9 de fe 49 8b 3c 24 e8 a1 ab b0
RSP: 0018:ffffc900041bfb20 EFLAGS: 00010216
RAX: 0000000000000006 RBX: dffffc0000000000 RCX: ffff8880268d5ac0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900041bfc50 R08: ffffc900041bfa6f R09: ffffc900041bf908
R10: dffffc0000000000 R11: fffff52000837f4e R12: 0000000000000030
R13: ffff888027b4c1a8 R14: ffff8880790b9a28 R15: ffff8880790b9a38
FS:  000055557244b500(0000) GS:ffff88812623b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f41064a2000 CR3: 0000000030b09000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
   0:	ab                   	stos   %eax,%es:(%rdi)
   1:	b0 fe                	mov    $0xfe,%al
   3:	4d 8d 77 f0          	lea    -0x10(%r15),%r14
   7:	4c 89 f0             	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 f6 b9 de fe       	call   0xfedeba12
  1c:	4d 8b 26             	mov    (%r14),%r12
  1f:	49 83 c4 30          	add    $0x30,%r12
  23:	4c 89 e0             	mov    %r12,%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 e7             	mov    %r12,%rdi
  33:	e8 da b9 de fe       	call   0xfedeba12
  38:	49 8b 3c 24          	mov    (%r12),%rdi
  3c:	e8                   	.byte 0xe8
  3d:	a1                   	.byte 0xa1
  3e:	ab                   	stos   %eax,%es:(%rdi)
  3f:	b0                   	.byte 0xb0