syzbot

general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
CPU: 1 PID: 4382 Comm: syz-executor 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:jfs_flush_journal+0x80e/0xec0 fs/jfs/jfs_logmgr.c:1573
Code: 27 b8 fe 4d 8d 77 f0 4c 89 f0 48 c1 e8 03 80 3c 18 00 74 08 4c 89 f7 e8 e0 ef df 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 c4 ef df fe 49 8b 3c 24 e8 6b 27 b8
RSP: 0018:ffffc900041f7b40 EFLAGS: 00010206
RAX: 0000000000000006 RBX: dffffc0000000000 RCX: 6419fbafd70b2c00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900041f7c78 R08: ffffc900041f7aa7 R09: ffffc900041f7a64
R10: dffffc0000000000 R11: fffff5200083ef55 R12: 0000000000000030
R13: ffff88805a1669a8 R14: ffff888079f77228 R15: ffff888079f77238
FS:  0000555581482500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0a2ea15000 CR3: 0000000060960000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 jfs_umount+0xf8/0x360 fs/jfs/jfs_umount.c:58
 jfs_put_super+0x88/0x190 fs/jfs/super.c:194
 generic_shutdown_super+0x130/0x340 fs/super.c:501
 kill_block_super+0x7c/0xe0 fs/super.c:1470
 deactivate_locked_super+0x93/0xf0 fs/super.c:332
 cleanup_mnt+0x42c/0x4b0 fs/namespace.c:1191
 task_work_run+0x1d0/0x260 kernel/task_work.c:203
 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+0xee/0x180 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f2b5f39d9d7
Code: a2 c7 05 1c ed 24 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 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 e8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffec01e2f58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f2b5f431f90 RCX: 00007f2b5f39d9d7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffec01e3010
RBP: 00007ffec01e3010 R08: 00007ffec01e4010 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffec01e40a0
R13: 00007f2b5f431f90 R14: 00000000000195e1 R15: 00007ffec01e40e0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:write_special_inodes fs/jfs/jfs_logmgr.c:208 [inline]
RIP: 0010:jfs_flush_journal+0x80e/0xec0 fs/jfs/jfs_logmgr.c:1573
Code: 27 b8 fe 4d 8d 77 f0 4c 89 f0 48 c1 e8 03 80 3c 18 00 74 08 4c 89 f7 e8 e0 ef df 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 c4 ef df fe 49 8b 3c 24 e8 6b 27 b8
RSP: 0018:ffffc900041f7b40 EFLAGS: 00010206
RAX: 0000000000000006 RBX: dffffc0000000000 RCX: 6419fbafd70b2c00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900041f7c78 R08: ffffc900041f7aa7 R09: ffffc900041f7a64
R10: dffffc0000000000 R11: fffff5200083ef55 R12: 0000000000000030
R13: ffff88805a1669a8 R14: ffff888079f77228 R15: ffff888079f77238
FS:  0000555581482500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6f1c5fe000 CR3: 0000000060960000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	b8 fe 4d 8d 77       	mov    $0x778d4dfe,%eax
   5:	f0 4c 89 f0          	lock mov %r14,%rax
   9:	48 c1 e8 03          	shr    $0x3,%rax
   d:	80 3c 18 00          	cmpb   $0x0,(%rax,%rbx,1)
  11:	74 08                	je     0x1b
  13:	4c 89 f7             	mov    %r14,%rdi
  16:	e8 e0 ef df fe       	call   0xfedfeffb
  1b:	4d 8b 26             	mov    (%r14),%r12
  1e:	49 83 c4 30          	add    $0x30,%r12
  22:	4c 89 e0             	mov    %r12,%rax
  25:	48 c1 e8 03          	shr    $0x3,%rax
* 29:	80 3c 18 00          	cmpb   $0x0,(%rax,%rbx,1) <-- trapping instruction
  2d:	74 08                	je     0x37
  2f:	4c 89 e7             	mov    %r12,%rdi
  32:	e8 c4 ef df fe       	call   0xfedfeffb
  37:	49 8b 3c 24          	mov    (%r12),%rdi
  3b:	e8                   	.byte 0xe8
  3c:	6b 27 b8             	imul   $0xffffffb8,(%rdi),%esp