Oops: divide error: 0000 [#1] SMP KASAN NOPTI
CPU: 3 UID: 0 PID: 15404 Comm: syz.3.2397 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:add_device drivers/mtd/devices/block2mtd.c:296 [inline]
RIP: 0010:block2mtd_setup2.isra.0+0x3c8/0xc70 drivers/mtd/devices/block2mtd.c:459
Code: 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 2b 08 00 00 48 8b 6d 08 31 ff 48 89 e8 48 c1 e0 09 48 99 <49> f7 ff 48 89 d6 48 89 54 24 10 e8 08 98 4f fb 48 8b 54 24 10 48
RSP: 0018:ffffc90004f4f9d8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 1ffff920009e9f3e RCX: ffffc9000e4b2000
RDX: 0000000000000000 RSI: ffffffff86ba31fa RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000005 R09: 000000000000001f
R10: 0000000000000007 R11: 0000000000000000 R12: ffffc90004f4fa90
R13: 0000000000000000 R14: ffff88807602c000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888096ef3000(0063) knlGS:00000000f544db40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000000000c2f3368 CR3: 000000006ae95000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 block2mtd_setup+0xbd/0xd0 drivers/mtd/devices/block2mtd.c:476
 param_attr_store+0x199/0x300 kernel/params.c:589
 module_attr_store+0x58/0x80 kernel/params.c:904
 sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145
 kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x6ac/0x1050 fs/read_write.c:687
 ksys_write+0x12a/0x250 fs/read_write.c:739
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0xe7/0x970 arch/x86/entry/syscall_32.c:307
 do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:332
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf705efec
Code: Unable to access opcode bytes at 0xf705efc2.
RSP: 002b:00000000f544d50c EFLAGS: 00000292 ORIG_RAX: 0000000000000004
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000080000700
RDX: 000000000000000c RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:add_device drivers/mtd/devices/block2mtd.c:296 [inline]
RIP: 0010:block2mtd_setup2.isra.0+0x3c8/0xc70 drivers/mtd/devices/block2mtd.c:459
Code: 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 2b 08 00 00 48 8b 6d 08 31 ff 48 89 e8 48 c1 e0 09 48 99 <49> f7 ff 48 89 d6 48 89 54 24 10 e8 08 98 4f fb 48 8b 54 24 10 48
RSP: 0018:ffffc90004f4f9d8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 1ffff920009e9f3e RCX: ffffc9000e4b2000
RDX: 0000000000000000 RSI: ffffffff86ba31fa RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000005 R09: 000000000000001f
R10: 0000000000000007 R11: 0000000000000000 R12: ffffc90004f4fa90
R13: 0000000000000000 R14: ffff88807602c000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888096ef3000(0063) knlGS:00000000f544db40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000056f5e4ec CR3: 000000006ae95000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
   0:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   7:	fc ff df
   a:	48 89 fa             	mov    %rdi,%rdx
   d:	48 c1 ea 03          	shr    $0x3,%rdx
  11:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
  15:	0f 85 2b 08 00 00    	jne    0x846
  1b:	48 8b 6d 08          	mov    0x8(%rbp),%rbp
  1f:	31 ff                	xor    %edi,%edi
  21:	48 89 e8             	mov    %rbp,%rax
  24:	48 c1 e0 09          	shl    $0x9,%rax
  28:	48 99                	cqto
* 2a:	49 f7 ff             	idiv   %r15 <-- trapping instruction
  2d:	48 89 d6             	mov    %rdx,%rsi
  30:	48 89 54 24 10       	mov    %rdx,0x10(%rsp)
  35:	e8 08 98 4f fb       	call   0xfb4f9842
  3a:	48 8b 54 24 10       	mov    0x10(%rsp),%rdx
  3f:	48                   	rex.W