kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 2781 Comm: syz-executor.2 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:ffff8880632273d0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc9000a2a1000
RDX: 000000000001b308 RSI: ffffffff85969d10 RDI: ffff8880623b1a00
RBP: ffff888063227460 R08: ffff888064d96080 R09: ffff88808a6f69a8
R10: ffffed10114ded34 R11: ffff88808a6f69a0 R12: 1ffff1100c644e7b
kobject: 'loop3' (0000000064291b2d): kobject_uevent_env
R13: ffff8880623b1a00 R14: ffff888063227438 R15: dffffc0000000000
FS:  00007f6c496ef700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe13759020 CR3: 000000008dffa000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 cttimeout_default_fill_info net/netfilter/nfnetlink_cttimeout.c:424 [inline]
 cttimeout_default_get+0x69a/0xa80 net/netfilter/nfnetlink_cttimeout.c:471
kobject: 'loop3' (0000000064291b2d): fill_kobj_path: path = '/devices/virtual/block/loop3'
 nfnetlink_rcv_msg+0xd12/0xfe0 net/netfilter/nfnetlink.c:228
kobject: 'loop1' (000000001e9edc9f): kobject_uevent_env
kobject: 'loop1' (000000001e9edc9f): fill_kobj_path: path = '/devices/virtual/block/loop1'
 netlink_rcv_skb+0x180/0x460 net/netlink/af_netlink.c:2454
 nfnetlink_rcv+0x1c0/0x460 net/netfilter/nfnetlink.c:560
 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline]
 netlink_unicast+0x53c/0x720 net/netlink/af_netlink.c:1343
 netlink_sendmsg+0x8ae/0xd70 net/netlink/af_netlink.c:1908
kobject: 'loop3' (0000000064291b2d): kobject_uevent_env
 sock_sendmsg_nosec net/socket.c:622 [inline]
 sock_sendmsg+0xdd/0x130 net/socket.c:632
kobject: 'loop3' (0000000064291b2d): fill_kobj_path: path = '/devices/virtual/block/loop3'
 ___sys_sendmsg+0x806/0x930 net/socket.c:2115
 __sys_sendmsg+0x105/0x1d0 net/socket.c:2153
kobject: 'loop1' (000000001e9edc9f): kobject_uevent_env
kobject: 'loop1' (000000001e9edc9f): fill_kobj_path: path = '/devices/virtual/block/loop1'
 __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: 0033:0x4582f9
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:00007f6c496eec78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004582f9
RDX: 0000000000000000 RSI: 0000000020dddfc8 RDI: 0000000000000003
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f6c496ef6d4
R13: 00000000004c5958 R14: 00000000004d9c48 R15: 00000000ffffffff
Modules linked in:
kobject: 'loop5' (0000000008677f8a): kobject_uevent_env
---[ end trace 748f1062cdcf3b26 ]---
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
kobject: 'loop5' (0000000008677f8a): fill_kobj_path: path = '/devices/virtual/block/loop5'
RSP: 0018:ffff8880632273d0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc9000a2a1000
RDX: 000000000001b308 RSI: ffffffff85969d10 RDI: ffff8880623b1a00
RBP: ffff888063227460 R08: ffff888064d96080 R09: ffff88808a6f69a8
R10: ffffed10114ded34 R11: ffff88808a6f69a0 R12: 1ffff1100c644e7b
R13: ffff8880623b1a00 R14: ffff888063227438 R15: dffffc0000000000
FS:  00007f6c496ef700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000018a3ba8 CR3: 000000008dffa000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
kobject: 'loop4' (0000000046e6be73): kobject_uevent_env