kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 18670 Comm: syz-executor.1 Not tainted 4.19.34 #2
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:udp_timeout_obj_to_nlattr+0x77/0x1a0 net/netfilter/nf_conntrack_proto_udp.c:209
Code: 96 85 c7 00 f1 f1 f1 f1 c7 40 04 04 f3 f3 f3 65 48 8b 04 25 28 00 00 00 48 89 45 d0 31 c0 e8 30 9a d4 fb 48 89 d8 48 c1 e8 03 <42> 0f b6 14 38 48 89 d8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85
RSP: 0018:ffff8880599f73d0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc90008070000
RDX: 0000000000016484 RSI: ffffffff85969d10 RDI: ffff888084c5b2c0
RBP: ffff8880599f7460 R08: ffff888093776680 R09: ffff8880900bc8a8
R10: ffffed1012017914 R11: ffff8880900bc8a0 R12: 1ffff1100b33ee7b
R13: ffff888084c5b2c0 R14: ffff8880599f7438 R15: dffffc0000000000
FS:  00007ff7fdd9f700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30421000 CR3: 0000000081381000 CR4: 00000000001426f0
Call Trace:
 cttimeout_default_fill_info net/netfilter/nfnetlink_cttimeout.c:424 [inline]
 cttimeout_default_get+0x69a/0xa80 net/netfilter/nfnetlink_cttimeout.c:471
 nfnetlink_rcv_msg+0xd12/0xfe0 net/netfilter/nfnetlink.c:228
 netlink_rcv_skb+0x180/0x460 net/netlink/af_netlink.c:2454
 nfnetlink_rcv+0x1c0/0x460 net/netfilter/nfnetlink.c:560
kobject: 'kvm' (00000000b779c8c2): kobject_uevent_env
 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline]
 netlink_unicast+0x53c/0x720 net/netlink/af_netlink.c:1343
kobject: 'kvm' (00000000b779c8c2): fill_kobj_path: path = '/devices/virtual/misc/kvm'
 netlink_sendmsg+0x8ae/0xd70 net/netlink/af_netlink.c:1908
 sock_sendmsg_nosec net/socket.c:622 [inline]
 sock_sendmsg+0xdd/0x130 net/socket.c:632
 ___sys_sendmsg+0x806/0x930 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+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x458c29
Code: ad b8 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 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ff7fdd9ec78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458c29
RDX: 0000000000000000 RSI: 0000000020dddfc8 RDI: 0000000000000003
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff7fdd9f6d4
R13: 00000000004c6501 R14: 00000000004dae68 R15: 00000000ffffffff
Modules linked in:
---[ end trace f7348b865280f7c2 ]---
kobject: '0:46' (000000008d2a4aa9): kobject_uevent_env
RIP: 0010:udp_timeout_obj_to_nlattr+0x77/0x1a0 net/netfilter/nf_conntrack_proto_udp.c:209
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
kobject: 'loop3' (00000000fe01f001): kobject_uevent_env
kobject: '0:46' (000000008d2a4aa9): fill_kobj_path: path = '/devices/virtual/bdi/0:46'
Code: 96 85 c7 00 f1 f1 f1 f1 c7 40 04 04 f3 f3 f3 65 48 8b 04 25 28 00 00 00 48 89 45 d0 31 c0 e8 30 9a d4 fb 48 89 d8 48 c1 e8 03 <42> 0f b6 14 38 48 89 d8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85
kobject: '0:46' (000000008d2a4aa9): kobject_cleanup, parent           (null)
kobject: 'loop3' (00000000fe01f001): fill_kobj_path: path = '/devices/virtual/block/loop3'
nf_conntrack: default automatic helper assignment has been turned off for security reasons and CT-based  firewall rule not found. Use the iptables CT target to attach helpers instead.
RSP: 0018:ffff8880599f73d0 EFLAGS: 00010246
kobject: '0:46' (000000008d2a4aa9): calling ktype release
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc90008070000
kobject: '0:46': free name
RDX: 0000000000016484 RSI: ffffffff85969d10 RDI: ffff888084c5b2c0
kobject: 'loop5' (00000000a9d96b46): kobject_uevent_env
kobject: '0:45' (000000004ef841f5): kobject_uevent_env
kobject: 'loop5' (00000000a9d96b46): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: '0:45' (000000004ef841f5): fill_kobj_path: path = '/devices/virtual/bdi/0:45'
kobject: '0:45' (000000004ef841f5): kobject_cleanup, parent           (null)
RBP: ffff8880599f7460 R08: ffff888093776680 R09: ffff8880900bc8a8
kobject: 'loop4' (0000000094b50f67): kobject_uevent_env
kobject: 'loop4' (0000000094b50f67): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop3' (00000000fe01f001): kobject_uevent_env
R10: ffffed1012017914 R11: ffff8880900bc8a0 R12: 1ffff1100b33ee7b
kobject: '0:45' (000000004ef841f5): calling ktype release
kobject: 'loop3' (00000000fe01f001): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: '0:45': free name
R13: ffff888084c5b2c0 R14: ffff8880599f7438 R15: dffffc0000000000
kobject: 'loop3' (00000000fe01f001): kobject_uevent_env
FS:  00007ff7fdd9f700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
kobject: 'loop3' (00000000fe01f001): fill_kobj_path: path = '/devices/virtual/block/loop3'
audit: type=1804 audit(1555135188.602:59): pid=18705 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir697515081/syzkaller.PXdWyj/497/bus" dev="sda1" ino=16530 res=1
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb503cd6000 CR3: 0000000081381000 CR4: 00000000001406e0