syzbot

Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
CPU: 1 PID: 5097 Comm: syz-executor164 Not tainted 6.9.0-syzkaller-12393-g9b62e02e6336 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
RIP: 0010:write_special_inodes+0xa9/0x170 fs/jfs/jfs_logmgr.c:208
Code: 2e e8 bb 55 e0 07 48 8d 7b 28 48 89 f8 48 c1 e8 03 80 3c 28 00 0f 85 b1 00 00 00 4c 8b 6b 28 49 8d 7d 30 48 89 f8 48 c1 e8 03 <80> 3c 28 00 0f 85 8e 00 00 00 49 8b 7d 30 2e e8 83 55 e0 07 48 8d
RSP: 0018:ffffc90004a3fbb8 EFLAGS: 00010216
RAX: 0000000000000006 RBX: ffff88802f7fca00 RCX: ffffffff81c0d98e
RDX: 0000000000000000 RSI: ffffffff81c0d941 RDI: 0000000000000030
RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffffffff81c1a260
R13: 0000000000000000 R14: ffff88802afc4800 R15: ffff8880186dc580
FS:  0000555583d5f380(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd6da05ff8 CR3: 0000000076240000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 lmLogSync+0x4a0/0x820 fs/jfs/jfs_logmgr.c:937
 jfs_syncpt+0x89/0xa0 fs/jfs/jfs_logmgr.c:1041
 jfs_sync_fs+0x83/0xb0 fs/jfs/super.c:685
 sync_filesystem+0x110/0x290 fs/sync.c:56
 generic_shutdown_super+0x7e/0x3d0 fs/super.c:621
 kill_block_super+0x3b/0x90 fs/super.c:1676
 deactivate_locked_super+0xc1/0x1a0 fs/super.c:473
 deactivate_super+0xde/0x100 fs/super.c:506
 cleanup_mnt+0x222/0x450 fs/namespace.c:1267
 task_work_run+0x151/0x250 kernel/task_work.c:180
 ptrace_notify+0x10e/0x130 kernel/signal.c:2402
 ptrace_report_syscall include/linux/ptrace.h:415 [inline]
 ptrace_report_syscall_exit include/linux/ptrace.h:477 [inline]
 syscall_exit_work kernel/entry/common.c:173 [inline]
 syscall_exit_to_user_mode_prepare+0x126/0x260 kernel/entry/common.c:200
 __syscall_exit_to_user_mode_work kernel/entry/common.c:205 [inline]
 syscall_exit_to_user_mode+0x11/0x2a0 kernel/entry/common.c:218
 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f13bd02c6f7
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 00 f0 ff ff 77 01 c3 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffd6da067a8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f13bd02c6f7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd6da06860
RBP: 00007ffd6da06860 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000202 R12: 00007ffd6da078d0
R13: 0000555583d606c0 R14: 431bde82d7b634db R15: 00007ffd6da078f0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:write_special_inodes+0xa9/0x170 fs/jfs/jfs_logmgr.c:208
Code: 2e e8 bb 55 e0 07 48 8d 7b 28 48 89 f8 48 c1 e8 03 80 3c 28 00 0f 85 b1 00 00 00 4c 8b 6b 28 49 8d 7d 30 48 89 f8 48 c1 e8 03 <80> 3c 28 00 0f 85 8e 00 00 00 49 8b 7d 30 2e e8 83 55 e0 07 48 8d
RSP: 0018:ffffc90004a3fbb8 EFLAGS: 00010216
RAX: 0000000000000006 RBX: ffff88802f7fca00 RCX: ffffffff81c0d98e
RDX: 0000000000000000 RSI: ffffffff81c0d941 RDI: 0000000000000030
RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffffffff81c1a260
R13: 0000000000000000 R14: ffff88802afc4800 R15: ffff8880186dc580
FS:  0000555583d5f380(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffdd86e8f58 CR3: 0000000076240000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
   0:	2e e8 bb 55 e0 07    	cs call 0x7e055c1
   6:	48 8d 7b 28          	lea    0x28(%rbx),%rdi
   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 b1 00 00 00    	jne    0xcc
  1b:	4c 8b 6b 28          	mov    0x28(%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 8e 00 00 00    	jne    0xc2
  34:	49 8b 7d 30          	mov    0x30(%r13),%rdi
  38:	2e e8 83 55 e0 07    	cs call 0x7e055c1
  3e:	48                   	rex.W
  3f:	8d                   	.byte 0x8d