md: personality for level  is not loaded!
general protection fault, probably for non-canonical address 0xdffffc0000000015: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x00000000000000a8-0x00000000000000af]
CPU: 1 PID: 4606 Comm: syz.1.91 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:mddev_suspend+0x347/0x650 drivers/md/md.c:508
Code: 4c 8d 68 08 4c 89 e8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ef e8 4a 4e c5 fa 41 bc a8 00 00 00 4d 03 65 00 4c 89 e0 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 e7 e8 2b 4e c5 fa 4c 8b 74 24 10 4c 89 f7
RSP: 0018:ffffc90003c3f9e0 EFLAGS: 00010202
RAX: 0000000000000015 RBX: dffffc0000000000 RCX: 0000000000080000
RDX: ffffc90005ba1000 RSI: 0000000000002ea6 RDI: 0000000000002ea7
RBP: ffffc90003c3fb10 R08: ffff88807d5a403f R09: 1ffff1100fab4807
R10: dffffc0000000000 R11: ffffed100fab4808 R12: 00000000000000a8
R13: ffff88807d5a4008 R14: ffff88807d5a4418 R15: ffff88807d5a4028
FS:  00007f3cdc10d6c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f53fe647000 CR3: 000000001f8b5000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 mddev_create_serial_pool+0x27f/0x470 drivers/md/md.c:232
 backlog_store+0x368/0x4a0 drivers/md/md-bitmap.c:2521
 md_attr_store+0xdd/0x130 drivers/md/md.c:5636
 kernfs_fop_write_iter+0x3a8/0x500 fs/kernfs/file.c:296
 call_write_iter include/linux/fs.h:2179 [inline]
 new_sync_write fs/read_write.c:507 [inline]
 vfs_write+0x748/0xd70 fs/read_write.c:594
 ksys_write+0x153/0x260 fs/read_write.c:647
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f3cddeb5159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f3cdc10d028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f3cde13cfa0 RCX: 00007f3cddeb5159
RDX: 0000000000000005 RSI: 0000200000000e00 RDI: 0000000000000009
RBP: 00007f3cddf4c024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3cde13d038 R14: 00007f3cde13cfa0 R15: 00007ffdd8700778
 </TASK>
Modules linked in:
---[ end trace 2cc5aa997d4ec802 ]---
RIP: 0010:mddev_suspend+0x347/0x650 drivers/md/md.c:508
Code: 4c 8d 68 08 4c 89 e8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ef e8 4a 4e c5 fa 41 bc a8 00 00 00 4d 03 65 00 4c 89 e0 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 e7 e8 2b 4e c5 fa 4c 8b 74 24 10 4c 89 f7
RSP: 0018:ffffc90003c3f9e0 EFLAGS: 00010202
RAX: 0000000000000015 RBX: dffffc0000000000 RCX: 0000000000080000
RDX: ffffc90005ba1000 RSI: 0000000000002ea6 RDI: 0000000000002ea7
RBP: ffffc90003c3fb10 R08: ffff88807d5a403f R09: 1ffff1100fab4807
R10: dffffc0000000000 R11: ffffed100fab4808 R12: 00000000000000a8
R13: ffff88807d5a4008 R14: ffff88807d5a4418 R15: ffff88807d5a4028
FS:  00007f3cdc10d6c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f53fe647000 CR3: 000000001f8b5000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	4c 8d 68 08          	lea    0x8(%rax),%r13
   4:	4c 89 e8             	mov    %r13,%rax
   7:	48 c1 e8 03          	shr    $0x3,%rax
   b:	80 3c 18 00          	cmpb   $0x0,(%rax,%rbx,1)
   f:	74 08                	je     0x19
  11:	4c 89 ef             	mov    %r13,%rdi
  14:	e8 4a 4e c5 fa       	call   0xfac54e63
  19:	41 bc a8 00 00 00    	mov    $0xa8,%r12d
  1f:	4d 03 65 00          	add    0x0(%r13),%r12
  23:	4c 89 e0             	mov    %r12,%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 e7             	mov    %r12,%rdi
  33:	e8 2b 4e c5 fa       	call   0xfac54e63
  38:	4c 8b 74 24 10       	mov    0x10(%rsp),%r14
  3d:	4c 89 f7             	mov    %r14,%rdi