Oops: divide error: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 10155 Comm: syz.2.1130 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:add_device drivers/mtd/devices/block2mtd.c:296 [inline]
RIP: 0010:block2mtd_setup2.isra.0+0x3c8/0xbd0 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 ae 07 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 c8 b5 40 fb 48 8b 54 24 10 48
RSP: 0018:ffffc900036c79f8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 1ffff920006d8f42 RCX: ffffc90005e7d000
RDX: 0000000000000000 RSI: ffffffff86cb1bca RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000005 R09: 000000000000001f
R10: 0000000000000007 R11: 0000000000000000 R12: ffffc900036c7ab0
R13: 0000000000000000 R14: ffff88802a678000 R15: 0000000000000000
FS:  00007f88c712e6c0(0000) GS:ffff888123b64000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2d0000 CR3: 00000000354b5000 CR4: 00000000003526f0
DR0: 0000000000000005 DR1: 00000000570fac24 DR2: 0000000000000010
DR3: 00000000000003ff DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 block2mtd_setup+0xbd/0xd0 drivers/mtd/devices/block2mtd.c:476
 param_attr_store+0x199/0x300 kernel/params.c:591
 module_attr_store+0x58/0x80 kernel/params.c:906
 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+0x6af/0x1050 fs/read_write.c:687
 ksys_write+0x12a/0x250 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f88c619e159
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:00007f88c712e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f88c6425fa0 RCX: 00007f88c619e159
RDX: 000000000000000c RSI: 0000200000000700 RDI: 0000000000000003
RBP: 00007f88c6235024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f88c6426038 R14: 00007f88c6425fa0 R15: 00007fff4d11f1a8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:add_device drivers/mtd/devices/block2mtd.c:296 [inline]
RIP: 0010:block2mtd_setup2.isra.0+0x3c8/0xbd0 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 ae 07 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 c8 b5 40 fb 48 8b 54 24 10 48
RSP: 0018:ffffc900036c79f8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 1ffff920006d8f42 RCX: ffffc90005e7d000
RDX: 0000000000000000 RSI: ffffffff86cb1bca RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000005 R09: 000000000000001f
R10: 0000000000000007 R11: 0000000000000000 R12: ffffc900036c7ab0
R13: 0000000000000000 R14: ffff88802a678000 R15: 0000000000000000
FS:  00007f88c712e6c0(0000) GS:ffff888123b64000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f507ac66e9c CR3: 00000000354b5000 CR4: 00000000003526f0
DR0: 0000000000000005 DR1: 00000000570fac24 DR2: 0000000000000010
DR3: 00000000000003ff DR6: 00000000ffff0ff0 DR7: 0000000000000400
----------------
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 ae 07 00 00    	jne    0x7c9
  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 c8 b5 40 fb       	call   0xfb40b602
  3a:	48 8b 54 24 10       	mov    0x10(%rsp),%rdx
  3f:	48                   	rex.W