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: 5061 Comm: syz-executor397 Not tainted 6.7.0-rc2-syzkaller-00029-g9b6de136b5f0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
RIP: 0010:write_special_inodes+0x71/0x170 fs/jfs/jfs_logmgr.c:207
Code: df e8 d3 2b 8c 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:ffffc9000335fbe0 EFLAGS: 00010206
RAX: 0000000000000006 RBX: ffff88807bb18e00 RCX: ffffffff81b430aa
RDX: ffff888020686140 RSI: ffffffff82fa547d RDI: 0000000000000030
RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffffffff81b4f000
R13: 0000000000000000 R14: ffff88807d0bf000 R15: ffff888019666200
FS:  0000555556e32380(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd94229918 CR3: 000000001c56f000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 lmLogSync+0x49c/0x820 fs/jfs/jfs_logmgr.c:937
 jfs_syncpt+0x89/0xa0 fs/jfs/jfs_logmgr.c:1041
 jfs_sync_fs+0x83/0xa0 fs/jfs/super.c:685
 sync_filesystem+0x109/0x280 fs/sync.c:56
 generic_shutdown_super+0x7e/0x3d0 fs/super.c:669
 kill_block_super+0x3b/0x90 fs/super.c:1667
 deactivate_locked_super+0xbc/0x1a0 fs/super.c:484
 deactivate_super+0xde/0x100 fs/super.c:517
 cleanup_mnt+0x222/0x450 fs/namespace.c:1256
 task_work_run+0x14d/0x240 kernel/task_work.c:180
 ptrace_notify+0x10d/0x130 kernel/signal.c:2399
 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:251 [inline]
 syscall_exit_to_user_mode_prepare+0x126/0x230 kernel/entry/common.c:278
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0xe/0x60 kernel/entry/common.c:296
 do_syscall_64+0x4d/0x110 arch/x86/entry/common.c:88
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f4846dbf3f7
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:00007ffe0776c7d8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f4846dbf3f7
RDX: 0000000000000000 RSI: 000000000000000a RDI: 00007ffe0776c890
RBP: 00007ffe0776c890 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000206 R12: 00007ffe0776d8f0
R13: 0000555556e336c0 R14: 0000000000000001 R15: 431bde82d7b634db
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:write_special_inodes+0x71/0x170 fs/jfs/jfs_logmgr.c:207
Code: df e8 d3 2b 8c 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:ffffc9000335fbe0 EFLAGS: 00010206
RAX: 0000000000000006 RBX: ffff88807bb18e00 RCX: ffffffff81b430aa
RDX: ffff888020686140 RSI: ffffffff82fa547d RDI: 0000000000000030
RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffffffff81b4f000
R13: 0000000000000000 R14: ffff88807d0bf000 R15: ffff888019666200
FS:  0000555556e32380(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055ca2d345278 CR3: 000000001c56f000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	df e8                	fucomip %st(0),%st
   2:	d3 2b                	shrl   %cl,(%rbx)
   4:	8c fe                	mov    %?,%esi
   6:	48 8d 7b 10          	lea    0x10(%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 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             	call   *%r12
  3b:	48 8d 7b 28          	lea    0x28(%rbx),%rdi
  3f:	48                   	rex.W