Oops: divide error: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 6053 Comm: syz.2.114 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:block2mtd_setup2+0x592/0xda0
Code: 48 8b 74 24 30 48 63 ce 48 89 d8 48 09 c8 48 c1 e8 20 4c 8b 64 24 10 74 0d 48 89 d8 48 99 48 f7 f9 49 89 d5 eb 09 89 d8 31 d2 <f7> f6 41 89 d5 31 ff 4c 89 ee e8 1f 94 2f fb 4d 85 ed 0f 85 90 04
RSP: 0018:ffffc9000433f9a0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001f00000
RBP: ffffc9000433fb98 R08: ffff88816cb8c2ef R09: 1ffff1102d97185d
R10: dffffc0000000000 R11: ffffed102d97185e R12: 0000000000000000
R13: ffff88816cd38bb4 R14: ffff88810db56000 R15: ffff88810db56000
FS:  00007f0d3a29e6c0(0000) GS:ffff88818c4d4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0d3a29dff8 CR3: 000000010ea92000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 block2mtd_setup+0x27/0xe0
 param_attr_store+0x214/0x310
 module_attr_store+0x65/0x90
 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: 0033:0x7f0d3939e1d9
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:00007f0d3a29e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f0d39625fa0 RCX: 00007f0d3939e1d9
RDX: 00000000000000b3 RSI: 0000200000000250 RDI: 0000000000000003
RBP: 00007f0d39435888 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0d39626038 R14: 00007f0d39625fa0 R15: 00007ffd9be82238
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:block2mtd_setup2+0x592/0xda0
Code: 48 8b 74 24 30 48 63 ce 48 89 d8 48 09 c8 48 c1 e8 20 4c 8b 64 24 10 74 0d 48 89 d8 48 99 48 f7 f9 49 89 d5 eb 09 89 d8 31 d2 <f7> f6 41 89 d5 31 ff 4c 89 ee e8 1f 94 2f fb 4d 85 ed 0f 85 90 04
RSP: 0018:ffffc9000433f9a0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001f00000
RBP: ffffc9000433fb98 R08: ffff88816cb8c2ef R09: 1ffff1102d97185d
R10: dffffc0000000000 R11: ffffed102d97185e R12: 0000000000000000
R13: ffff88816cd38bb4 R14: ffff88810db56000 R15: ffff88810db56000
FS:  00007f0d3a29e6c0(0000) GS:ffff88818c4d4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000010ea92000 CR4: 00000000000006f0
