syzbot

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: 5000 Comm: syz-executor113 Not tainted 6.4.0-rc3-syzkaller-00291-g4e893b5aa4ac #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
RIP: 0010:write_special_inodes+0x71/0x170 fs/jfs/jfs_logmgr.c:207
Code: df e8 33 82 95 fe 48 8d 7b 10 48 89 f8 48 c1 e8 03 80 3c 28 00 0f 85 b7 00 00 00 4c 8b 6b 10 49 8d 7d 30 48 89 f8 48 c1 e8 03 <80> 3c 28 00 0f 85 d1 00 00 00 49 8b 7d 30 41 ff d4 48 8d 7b 28 48
RSP: 0018:ffffc90003a3fbb0 EFLAGS: 00010216
RAX: 0000000000000006 RBX: ffff888029638200 RCX: 0000000000000000
RDX: ffff88807e100000 RSI: ffffffff82eec49d RDI: 0000000000000030
RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff81b0c060
R13: 0000000000000000 R14: ffff888027383800 R15: ffff888142664f40
FS:  0000555555d32300(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555555d3b628 CR3: 000000001e809000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 lmLogSync+0x465/0x810 fs/jfs/jfs_logmgr.c:937
 jfs_syncpt+0x8d/0xa0 fs/jfs/jfs_logmgr.c:1041
 jfs_sync_fs+0x84/0xa0 fs/jfs/super.c:685
 sync_filesystem.part.0+0x75/0x1d0 fs/sync.c:56
 sync_filesystem+0x8f/0xc0 fs/sync.c:43
 generic_shutdown_super+0x74/0x480 fs/super.c:473
 kill_block_super+0xa1/0x100 fs/super.c:1407
 deactivate_locked_super+0x98/0x160 fs/super.c:331
 deactivate_super+0xb1/0xd0 fs/super.c:362
 cleanup_mnt+0x2ae/0x3d0 fs/namespace.c:1177
 task_work_run+0x16f/0x270 kernel/task_work.c:179
 ptrace_notify+0x118/0x140 kernel/signal.c:2369
 ptrace_report_syscall include/linux/ptrace.h:411 [inline]
 ptrace_report_syscall_exit include/linux/ptrace.h:473 [inline]
 syscall_exit_work kernel/entry/common.c:252 [inline]
 syscall_exit_to_user_mode_prepare+0x129/0x220 kernel/entry/common.c:279
 __syscall_exit_to_user_mode_work kernel/entry/common.c:284 [inline]
 syscall_exit_to_user_mode+0xd/0x50 kernel/entry/common.c:297
 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f5ab62ede87
Code: 07 00 48 83 c4 08 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc0fbd2f38 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f5ab62ede87
RDX: 00007ffc0fbd2ff9 RSI: 000000000000000a RDI: 00007ffc0fbd2ff0
RBP: 00007ffc0fbd2ff0 R08: 00000000ffffffff R09: 00007ffc0fbd2dd0
R10: 0000555555d33653 R11: 0000000000000202 R12: 00007ffc0fbd4060
R13: 0000555555d335f0 R14: 00007ffc0fbd2f60 R15: 0000000000000002
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:write_special_inodes+0x71/0x170 fs/jfs/jfs_logmgr.c:207
Code: df e8 33 82 95 fe 48 8d 7b 10 48 89 f8 48 c1 e8 03 80 3c 28 00 0f 85 b7 00 00 00 4c 8b 6b 10 49 8d 7d 30 48 89 f8 48 c1 e8 03 <80> 3c 28 00 0f 85 d1 00 00 00 49 8b 7d 30 41 ff d4 48 8d 7b 28 48
RSP: 0018:ffffc90003a3fbb0 EFLAGS: 00010216
RAX: 0000000000000006 RBX: ffff888029638200 RCX: 0000000000000000
RDX: ffff88807e100000 RSI: ffffffff82eec49d RDI: 0000000000000030
RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff81b0c060
R13: 0000000000000000 R14: ffff888027383800 R15: ffff888142664f40
FS:  0000555555d32300(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055c479c062b8 CR3: 000000001e809000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
   0:	df e8                	fucomip %st(0),%st
   2:	33 82 95 fe 48 8d    	xor    -0x72b7016b(%rdx),%eax
   8:	7b 10                	jnp    0x1a
   a:	48 89 f8             	mov    %rdi,%rax
   d:	48 c1 e8 03          	shr    $0x3,%rax
  11:	80 3c 28 00          	cmpb   $0x0,(%rax,%rbp,1)
  15:	0f 85 b7 00 00 00    	jne    0xd2
  1b:	4c 8b 6b 10          	mov    0x10(%rbx),%r13
  1f:	49 8d 7d 30          	lea    0x30(%r13),%rdi
  23:	48 89 f8             	mov    %rdi,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	80 3c 28 00          	cmpb   $0x0,(%rax,%rbp,1) <-- trapping instruction
  2e:	0f 85 d1 00 00 00    	jne    0x105
  34:	49 8b 7d 30          	mov    0x30(%r13),%rdi
  38:	41 ff d4             	callq  *%r12
  3b:	48 8d 7b 28          	lea    0x28(%rbx),%rdi
  3f:	48                   	rex.W