loop1: detected capacity change from 0 to 32768
general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047]
CPU: 0 PID: 8544 Comm: syz.1.701 Not tainted 6.6.102-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:write_special_inodes fs/jfs/jfs_logmgr.c:208 [inline]
RIP: 0010:lmLogSync+0x22f/0x9c0 fs/jfs/jfs_logmgr.c:937
Code: 72 b3 fe 4d 8d 7e f0 4c 89 f8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ff e8 6f 4e dd fe 4d 8b 3f 49 83 c7 40 4c 89 f8 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 ff e8 53 4e dd fe 49 8b 3f e8 db 71 b3 fe
RSP: 0018:ffffc9000baf7ac0 EFLAGS: 00010202
RAX: 0000000000000008 RBX: dffffc0000000000 RCX: 1e40b1b954d00500
RDX: ffffc9000d25a000 RSI: 00000000000017fd RDI: 00000000000017fe
RBP: ffffc9000baf7bc8 R08: ffffc9000baf7a27 R09: 0000000000000000
R10: ffffc9000baf79e0 R11: fffff5200175ef45 R12: ffff8880770ab000
R13: dffffc0000000000 R14: ffff8880300aa638 R15: 0000000000000040
FS:  00007f1cbd4a26c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9d102e3e9c CR3: 000000005520b000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 jfs_syncpt+0x7b/0x90 fs/jfs/jfs_logmgr.c:1041
 jfs_sync_fs+0x87/0xa0 fs/jfs/super.c:685
 sync_filesystem+0xea/0x220 fs/sync.c:56
 jfs_remount+0xec/0x5b0 fs/jfs/super.c:432
 reconfigure_super+0x21e/0x880 fs/super.c:1151
 do_remount fs/namespace.c:2905 [inline]
 path_mount+0xd19/0xfe0 fs/namespace.c:3690
 do_mount fs/namespace.c:3711 [inline]
 __do_sys_mount fs/namespace.c:3920 [inline]
 __se_sys_mount+0x2da/0x3c0 fs/namespace.c:3897
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f1cbc58ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007f1cbd4a2038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f1cbc7b5fa0 RCX: 00007f1cbc58ebe9
RDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000000000000000
RBP: 00007f1cbc611e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000002236824 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1cbc7b6038 R14: 00007f1cbc7b5fa0 R15: 00007fff249ca4d8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:write_special_inodes fs/jfs/jfs_logmgr.c:208 [inline]
RIP: 0010:lmLogSync+0x22f/0x9c0 fs/jfs/jfs_logmgr.c:937
Code: 72 b3 fe 4d 8d 7e f0 4c 89 f8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ff e8 6f 4e dd fe 4d 8b 3f 49 83 c7 40 4c 89 f8 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 ff e8 53 4e dd fe 49 8b 3f e8 db 71 b3 fe
RSP: 0018:ffffc9000baf7ac0 EFLAGS: 00010202
RAX: 0000000000000008 RBX: dffffc0000000000 RCX: 1e40b1b954d00500
RDX: ffffc9000d25a000 RSI: 00000000000017fd RDI: 00000000000017fe
RBP: ffffc9000baf7bc8 R08: ffffc9000baf7a27 R09: 0000000000000000
R10: ffffc9000baf79e0 R11: fffff5200175ef45 R12: ffff8880770ab000
R13: dffffc0000000000 R14: ffff8880300aa638 R15: 0000000000000040
FS:  00007f1cbd4a26c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000560b20c94078 CR3: 000000005520b000 CR4: 00000000003506f0
----------------
Code disassembly (best guess):
   0:	72 b3                	jb     0xffffffb5
   2:	fe 4d 8d             	decb   -0x73(%rbp)
   5:	7e f0                	jle    0xfffffff7
   7:	4c 89 f8             	mov    %r15,%rax
   a:	48 c1 e8 03          	shr    $0x3,%rax
   e:	80 3c 18 00          	cmpb   $0x0,(%rax,%rbx,1)
  12:	74 08                	je     0x1c
  14:	4c 89 ff             	mov    %r15,%rdi
  17:	e8 6f 4e dd fe       	call   0xfedd4e8b
  1c:	4d 8b 3f             	mov    (%r15),%r15
  1f:	49 83 c7 40          	add    $0x40,%r15
  23:	4c 89 f8             	mov    %r15,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	80 3c 18 00          	cmpb   $0x0,(%rax,%rbx,1) <-- trapping instruction
  2e:	74 08                	je     0x38
  30:	4c 89 ff             	mov    %r15,%rdi
  33:	e8 53 4e dd fe       	call   0xfedd4e8b
  38:	49 8b 3f             	mov    (%r15),%rdi
  3b:	e8 db 71 b3 fe       	call   0xfeb3721b