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: 0 UID: 0 PID: 5840 Comm: syz-executor263 Not tainted 6.12.0-rc5-syzkaller-00063-g0fc810ae3ae1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:write_special_inodes+0x71/0x170 fs/jfs/jfs_logmgr.c:207
Code: df e8 43 21 7c fe 48 8d 7b 10 48 89 f8 48 c1 e8 03 80 3c 28 00 0f 85 c0 00 00 00 4c 8b 6b 10 49 8d 7d 30 48 89 f8 48 c1 e8 03 <80> 3c 28 00 0f 85 da 00 00 00 49 8b 7d 30 2e e8 fb 58 12 08 48 8d
RSP: 0018:ffffc90004aafbb8 EFLAGS: 00010216
RAX: 0000000000000006 RBX: ffff888026f5ec00 RCX: ffffffff81c1141e
RDX: ffff88802fae5a00 RSI: ffffffff83115a2d RDI: 0000000000000030
RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff81c1db00
R13: 0000000000000000 R14: ffff888026376000 R15: ffff8880335a5380
FS:  000055556e48d380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffca289aedc CR3: 000000007af84000 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:1696
 deactivate_locked_super+0xc1/0x1a0 fs/super.c:473
 deactivate_super+0xde/0x100 fs/super.c:506
 cleanup_mnt+0x222/0x450 fs/namespace.c:1373
 task_work_run+0x151/0x250 kernel/task_work.c:239
 ptrace_notify+0x10e/0x130 kernel/signal.c:2403
 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: 0033:0x7fe2959b9677
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:00007ffca289aec8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fe2959b9677
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffca289af80
RBP: 00007ffca289af80 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000202 R12: 00007ffca289bff0
R13: 000055556e48e6c0 R14: 431bde82d7b634db R15: 00007ffca289c010
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:write_special_inodes+0x71/0x170 fs/jfs/jfs_logmgr.c:207
Code: df e8 43 21 7c fe 48 8d 7b 10 48 89 f8 48 c1 e8 03 80 3c 28 00 0f 85 c0 00 00 00 4c 8b 6b 10 49 8d 7d 30 48 89 f8 48 c1 e8 03 <80> 3c 28 00 0f 85 da 00 00 00 49 8b 7d 30 2e e8 fb 58 12 08 48 8d
RSP: 0018:ffffc90004aafbb8 EFLAGS: 00010216
RAX: 0000000000000006 RBX: ffff888026f5ec00 RCX: ffffffff81c1141e
RDX: ffff88802fae5a00 RSI: ffffffff83115a2d RDI: 0000000000000030
RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff81c1db00
R13: 0000000000000000 R14: ffff888026376000 R15: ffff8880335a5380
FS:  000055556e48d380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055e85fd13000 CR3: 000000007af84000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
   0:	df e8                	fucomip %st(0),%st
   2:	43 21 7c fe 48       	and    %edi,0x48(%r14,%r15,8)
   7:	8d 7b 10             	lea    0x10(%rbx),%edi
   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 c0 00 00 00    	jne    0xdb
  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 da 00 00 00    	jne    0x10e
  34:	49 8b 7d 30          	mov    0x30(%r13),%rdi
  38:	2e e8 fb 58 12 08    	cs call 0x8125939
  3e:	48                   	rex.W
  3f:	8d                   	.byte 0x8d