netlink: 20 bytes leftover after parsing attributes in process `syz-executor2'.
divide error: 0000 [#1] SMP KASAN
CPU: 1 PID: 23511 Comm: syz-executor6 Not tainted 4.19.0-rc2+ #221
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:div_s64_rem include/linux/math64.h:41 [inline]
RIP: 0010:div_s64 include/linux/math64.h:139 [inline]
RIP: 0010:__nbd_ioctl drivers/block/nbd.c:1242 [inline]
RIP: 0010:nbd_ioctl+0x53c/0xcf0 drivers/block/nbd.c:1303
Code: ea 03 80 3c 02 00 0f 85 1c 07 00 00 48 8b b5 c0 fe ff ff 48 63 8d b8 fe ff ff 48 8b 86 c8 00 00 00 48 8d be c0 00 00 00 48 99 <48> f7 f9 48 ba 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 80 3c
RSP: 0018:ffff880191daf828 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff880188284000 RDI: ffff8801882840c0
RBP: ffff880191daf9a0 R08: ffff8801b81e0480 R09: ffffed003a624c1d
R10: ffff880191daf818 R11: ffff8801d31260ef R12: ffff8801d3126000
R13: 00000000ffffffe7 R14: ffff8801d31260e0 R15: ffff880164efa600
FS:  00007f68a9422700(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32322000 CR3: 00000001c45d3000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __blkdev_driver_ioctl block/ioctl.c:303 [inline]
 blkdev_ioctl+0x9cd/0x2030 block/ioctl.c:601
 block_ioctl+0xee/0x130 fs/block_dev.c:1883
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:685
 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:702
 __do_sys_ioctl fs/ioctl.c:709 [inline]
 __se_sys_ioctl fs/ioctl.c:707 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:707
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457099
Code: fd b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f68a9421c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f68a94226d4 RCX: 0000000000457099
RDX: 0000000000000000 RSI: 000000000000ab01 RDI: 0000000000000004
RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004cfca0 R14: 00000000004c5e54 R15: 0000000000000000
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
---[ end trace d2eab093c944b701 ]---
RIP: 0010:div_s64_rem include/linux/math64.h:41 [inline]
RIP: 0010:div_s64 include/linux/math64.h:139 [inline]
RIP: 0010:__nbd_ioctl drivers/block/nbd.c:1242 [inline]
RIP: 0010:nbd_ioctl+0x53c/0xcf0 drivers/block/nbd.c:1303
Code: ea 03 80 3c 02 00 0f 85 1c 07 00 00 48 8b b5 c0 fe ff ff 48 63 8d b8 fe ff ff 48 8b 86 c8 00 00 00 48 8d be c0 00 00 00 48 99 <48> f7 f9 48 ba 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 80 3c
RSP: 0018:ffff880191daf828 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff880188284000 RDI: ffff8801882840c0
RBP: ffff880191daf9a0 R08: ffff8801b81e0480 R09: ffffed003a624c1d
R10: ffff880191daf818 R11: ffff8801d31260ef R12: ffff8801d3126000
R13: 00000000ffffffe7 R14: ffff8801d31260e0 R15: ffff880164efa600
FS:  00007f68a9422700(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32322000 CR3: 00000001c45d3000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400