BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
PGD 8f070067 P4D 8f070067 PUD 9584c067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 20142 Comm: syz-executor.3 Not tainted 4.19.73 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:          (null)
Code: Bad RIP value.
RSP: 0018:ffff888040daf4d8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffffffff87e1fb80 RCX: ffffc9000c693000
kobject: 'loop4' (000000000d420129): kobject_uevent_env
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff88805d10f240
RBP: ffff888040daf5d0 R08: ffff888089904340 R09: ffff888040daf658
R10: ffffed10081b5ed9 R11: ffff888040daf6cf R12: ffff888040daf5a8
R13: ffff88805d10f240 R14: 0000000000000001 R15: ffffffff87e1fb80
FS:  00007f4aad056700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
kobject: 'loop4' (000000000d420129): fill_kobj_path: path = '/devices/virtual/block/loop4'
CR2: ffffffffffffffd6 CR3: 000000009f0f1000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 tc_bind_tclass+0x13c/0x490 net/sched/sch_api.c:1834
kobject: 'loop1' (00000000ce3b5251): kobject_uevent_env
kobject: 'loop1' (00000000ce3b5251): fill_kobj_path: path = '/devices/virtual/block/loop1'
 tc_ctl_tclass+0xaa9/0xc60 net/sched/sch_api.c:1968
kobject: 'loop5' (000000005d5b0029): kobject_uevent_env
kobject: 'loop5' (000000005d5b0029): fill_kobj_path: path = '/devices/virtual/block/loop5'
 rtnetlink_rcv_msg+0x463/0xb00 net/core/rtnetlink.c:4747
 netlink_rcv_skb+0x17d/0x460 net/netlink/af_netlink.c:2454
 rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:4765
 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline]
 netlink_unicast+0x537/0x720 net/netlink/af_netlink.c:1343
 netlink_sendmsg+0x8ae/0xd70 net/netlink/af_netlink.c:1908
 sock_sendmsg_nosec net/socket.c:622 [inline]
 sock_sendmsg+0xd7/0x130 net/socket.c:632
 ___sys_sendmsg+0x803/0x920 net/socket.c:2115
 __sys_sendmsg+0x105/0x1d0 net/socket.c:2153
 __do_sys_sendmsg net/socket.c:2162 [inline]
 __se_sys_sendmsg net/socket.c:2160 [inline]
 __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2160
 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4598e9
Code: fd b7 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 b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
kobject: 'loop1' (00000000ce3b5251): kobject_uevent_env
RSP: 002b:00007f4aad055c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
kobject: 'loop1' (00000000ce3b5251): fill_kobj_path: path = '/devices/virtual/block/loop1'
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004598e9
RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4aad0566d4
R13: 00000000004c77fb R14: 00000000004dd098 R15: 00000000ffffffff
Modules linked in:
CR2: 0000000000000000
---[ end trace 68bcc843dc1bda04 ]---
kobject: 'loop2' (00000000d905ac32): kobject_uevent_env
RIP: 0010:          (null)
kobject: 'loop2' (00000000d905ac32): fill_kobj_path: path = '/devices/virtual/block/loop2'
Code: Bad RIP value.
RSP: 0018:ffff888040daf4d8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffffffff87e1fb80 RCX: ffffc9000c693000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff88805d10f240
RBP: ffff888040daf5d0 R08: ffff888089904340 R09: ffff888040daf658
R10: ffffed10081b5ed9 R11: ffff888040daf6cf R12: ffff888040daf5a8
R13: ffff88805d10f240 R14: 0000000000000001 R15: ffffffff87e1fb80
FS:  00007f4aad056700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 000000009f0f1000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400