loop2: detected capacity change from 0 to 32768
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
CPU: 1 UID: 0 PID: 20641 Comm: syz.2.6286 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:write_special_inodes+0x71/0x170 fs/jfs/jfs_logmgr.c:207
Code: df e8 93 6f 72 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 4b ba 4b 08 48 8d
RSP: 0018:ffffc900228cfb08 EFLAGS: 00010216
RAX: 0000000000000006 RBX: ffff8880770c0400 RCX: ffffc9000c80c000
RDX: 0000000000080000 RSI: ffffffff83491bbd RDI: 0000000000000030
RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff81f20600
R13: 0000000000000000 R14: ffff888025233000 R15: ffff888022714a80
FS:  00007ff2234ca6c0(0000) GS:ffff8881247bc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe7731f2b60 CR3: 000000007acdf000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 lmLogSync+0x49e/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:650
 sync_filesystem+0x111/0x290 fs/sync.c:56
 jfs_reconfigure+0xf8/0xb90 fs/jfs/super.c:370
 reconfigure_super+0x450/0xb60 fs/super.c:1077
 do_remount fs/namespace.c:3324 [inline]
 path_mount+0x1805/0x2000 fs/namespace.c:4115
 do_mount fs/namespace.c:4136 [inline]
 __do_sys_mount fs/namespace.c:4347 [inline]
 __se_sys_mount fs/namespace.c:4324 [inline]
 __x64_sys_mount+0x28d/0x310 fs/namespace.c:4324
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff22259038a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff2234c9e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ff2234c9ef0 RCX: 00007ff22259038a
RDX: 0000200000000580 RSI: 0000200000000f00 RDI: 0000000000000000
RBP: 0000200000000580 R08: 00007ff2234c9ef0 R09: 0000000001a4a438
R10: 0000000001a4a438 R11: 0000000000000246 R12: 0000200000000f00
R13: 00007ff2234c9eb0 R14: 0000000000000000 R15: 00002000000008c0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:write_special_inodes+0x71/0x170 fs/jfs/jfs_logmgr.c:207
Code: df e8 93 6f 72 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 4b ba 4b 08 48 8d
RSP: 0018:ffffc900228cfb08 EFLAGS: 00010216
RAX: 0000000000000006 RBX: ffff8880770c0400 RCX: ffffc9000c80c000
RDX: 0000000000080000 RSI: ffffffff83491bbd RDI: 0000000000000030
RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff81f20600
R13: 0000000000000000 R14: ffff888025233000 R15: ffff888022714a80
FS:  00007ff2234ca6c0(0000) GS:ffff8881247bc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffee306dec8 CR3: 000000007acdf000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
   0:	df e8                	fucomip %st(0),%st
   2:	93                   	xchg   %eax,%ebx
   3:	6f                   	outsl  %ds:(%rsi),(%dx)
   4:	72 fe                	jb     0x4
   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 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 4b ba 4b 08    	cs call 0x84bba89
  3e:	48                   	rex.W
  3f:	8d                   	.byte 0x8d