md: could not open device unknown-block(1,8).
md: could not open device unknown-block(1,9).
md/raid:md4: not clean -- starting background reconstruction
Oops: divide error: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 31515 Comm: syz.4.6070 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:raid5_run+0x625/0x2560
Code: 85 ed 0f 85 47 1f 00 00 e8 18 69 3e f9 48 c7 44 24 48 00 00 00 00 48 bd 00 00 00 00 00 fc ff df e9 dc 01 00 00 44 89 e8 31 d2 <f7> f1 41 89 d7 48 89 44 24 48 48 bd 00 00 00 00 00 fc ff df 31 ff
RSP: 0018:ffffc90004c378e8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000005 RDI: ffff8881a5c5615c
RBP: 0000000000000002 R08: ffff8881a5c5602f R09: 1ffff11034b8ac05
R10: dffffc0000000000 R11: ffffed1034b8ac06 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: ffff8881a5c561dc
FS:  00007f8d160426c0(0000) GS:ffff88818c4bb000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc9aecfeff8 CR3: 000000011f31a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 md_run+0xc3d/0x1cd0
 do_md_run+0x35/0x720
 array_state_store+0x958/0xe90
 md_attr_store+0x3b7/0x640
 kernfs_fop_write_iter+0x3a4/0x540
 vfs_write+0x612/0xba0
 ksys_write+0x150/0x270
 do_syscall_64+0x166/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8d1519f559
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:00007f8d16042028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f8d15425fa0 RCX: 00007f8d1519f559
RDX: 0000000000000006 RSI: 0000200000000440 RDI: 000000000000000b
RBP: 00007f8d15236b20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8d15426038 R14: 00007f8d15425fa0 R15: 00007ffe5bad87d8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:raid5_run+0x625/0x2560
Code: 85 ed 0f 85 47 1f 00 00 e8 18 69 3e f9 48 c7 44 24 48 00 00 00 00 48 bd 00 00 00 00 00 fc ff df e9 dc 01 00 00 44 89 e8 31 d2 <f7> f1 41 89 d7 48 89 44 24 48 48 bd 00 00 00 00 00 fc ff df 31 ff
RSP: 0018:ffffc90004c378e8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000005 RDI: ffff8881a5c5615c
RBP: 0000000000000002 R08: ffff8881a5c5602f R09: 1ffff11034b8ac05
R10: dffffc0000000000 R11: ffffed1034b8ac06 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: ffff8881a5c561dc
FS:  00007f8d160426c0(0000) GS:ffff88818c4bb000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe56a2dfc4 CR3: 000000011f31a000 CR4: 00000000000006f0
