bisecting fixing commit since 9fa690a2a016e1b55356835f047b952e67d3d73a
building syzkaller on 5ed23f9aa677d71bc60f61df8e05046151868541
testing commit 9fa690a2a016e1b55356835f047b952e67d3d73a with gcc (GCC) 8.1.0
kernel signature: f8457c5d33bd195517f8d9793439ad819216abbc0e98cf52731428f2be2ddd72
all runs: crashed: general protection fault in nfnetlink_parse_nat_setup
testing current HEAD a41ba30d9df20fe141c92aacbb56b6b077f19716
testing commit a41ba30d9df20fe141c92aacbb56b6b077f19716 with gcc (GCC) 8.1.0
kernel signature: 2c1ea76333873ead306cad96079f50ca8ed3bf05dec2671ba197536973318f46
all runs: crashed: general protection fault in nfnetlink_parse_nat_setup
revisions tested: 2, total time: 24m2.106941638s (build: 16m28.440975709s, test: 6m21.084745925s)
the crash still happens on HEAD
commit msg: Linux 4.14.181
crash: general protection fault in nfnetlink_parse_nat_setup
IPv6: ADDRCONF(NETDEV_UP): veth1_to_batadv: link is not ready
IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready
kasan: GPF could be caused by NULL-ptr deref or user memory access
IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready
general protection fault: 0000 [#1] PREEMPT SMP KASAN
IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_hsr: link becomes ready
Modules linked in:
CPU: 0 PID: 7655 Comm: syz-executor.2 Not tainted 4.14.181-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8880a84f24c0 task.stack: ffff88808d0e8000
RIP: 0010:nfnetlink_parse_nat net/netfilter/nf_nat_core.c:747 [inline]
RIP: 0010:nfnetlink_parse_nat_setup+0x1ce/0x320 net/netfilter/nf_nat_core.c:784
RSP: 0018:ffff88808d0ef0a0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000060000007 RSI: 0000000000000000 RDI: 000000030000003b
RBP: ffff88808d0ef1c0 R08: dffffc0000000000 R09: 0000000000000000
R10: ffffed1011a1de2c R11: ffff88808d0ef167 R12: ffff88808d0ef138
R13: ffff8880a80a4dc0 R14: 0000000300000003 R15: ffff88808d0ef198
FS:  00007f08df999700(0000) GS:ffff8880aec00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5db07d5000 CR3: 00000000a953b000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ctnetlink_parse_nat_setup+0x61/0x3d0 net/netfilter/nf_conntrack_netlink.c:1421
 ctnetlink_setup_nat net/netfilter/nf_conntrack_netlink.c:1491 [inline]
 ctnetlink_create_conntrack+0x366/0xf10 net/netfilter/nf_conntrack_netlink.c:1840
 ctnetlink_new_conntrack+0x432/0xd30 net/netfilter/nf_conntrack_netlink.c:1964
IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready
 nfnetlink_rcv_msg+0x89a/0xa70 net/netfilter/nfnetlink.c:214
 netlink_rcv_skb+0x133/0x370 net/netlink/af_netlink.c:2433
IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready
 nfnetlink_rcv+0x176/0x1570 net/netfilter/nfnetlink.c:515
 netlink_unicast_kernel net/netlink/af_netlink.c:1287 [inline]
 netlink_unicast+0x40b/0x600 net/netlink/af_netlink.c:1313
 netlink_sendmsg+0x730/0xbd0 net/netlink/af_netlink.c:1878
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xb5/0xf0 net/socket.c:656
 ___sys_sendmsg+0x625/0x920 net/socket.c:2062
 __sys_sendmsg+0xc1/0x140 net/socket.c:2096
 SYSC_sendmsg net/socket.c:2107 [inline]
 SyS_sendmsg+0xd/0x20 net/socket.c:2103
 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x45b349
RSP: 002b:00007f08df998c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f08df9996d4 RCX: 000000000045b349
RDX: 0000000000000000 RSI: 0000000020000640 RDI: 0000000000000003
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000941 R14: 00000000004ca9f7 R15: 000000000075bf2c
Code: 00 00 00 4c 89 e7 83 e9 04 e8 bf f9 d1 fd 85 c0 0f 88 eb 00 00 00 49 8d 7e 38 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 31 01 00 00 48 8b b5 e0 fe ff ff 4c 89 e7 41 
RIP: nfnetlink_parse_nat net/netfilter/nf_nat_core.c:747 [inline] RSP: ffff88808d0ef0a0
RIP: nfnetlink_parse_nat_setup+0x1ce/0x320 net/netfilter/nf_nat_core.c:784 RSP: ffff88808d0ef0a0
IPv6: ADDRCONF(NETDEV_UP): veth1_to_hsr: link is not ready
8021q: adding VLAN 0 to HW filter on device batadv0
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_hsr: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready
---[ end trace ffc8f4edcd62d256 ]---