bisecting fixing commit since 9a95f25269bd9257ab9fba7bb14355d50b5f39ec building syzkaller on c8e81ce4c7e3b59e7c83c6fab56c217916f3b3b6 testing commit 9a95f25269bd9257ab9fba7bb14355d50b5f39ec with gcc (GCC) 8.1.0 kernel signature: 9bcd416846ce9312c3485d0d25cc1b31b403fe525cff2a87ee1f7f82a453cce0 all runs: crashed: invalid opcode in nft_bitwise_ops testing current HEAD 98db2bf27b9ed2d5ed0b6c9c8a4bfcb127a19796 testing commit 98db2bf27b9ed2d5ed0b6c9c8a4bfcb127a19796 with gcc (GCC) 8.1.0 kernel signature: d3d328ddd21ff5b5d253805bfec5071824fd4fad4e59c284295795fc50073f6f all runs: crashed: invalid opcode in nft_bitwise_ops revisions tested: 2, total time: 26m21.663629504s (build: 18m23.500843792s, test: 6m29.978904413s) the crash still happens on HEAD commit msg: Linux 4.14.171 crash: invalid opcode in nft_bitwise_ops IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_hsr: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready IPv6: ADDRCONF(NETDEV_UP): veth1_vlan: link is not ready IPv6: ADDRCONF(NETDEV_UP): hsr0: link is not ready IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready invalid opcode: 0000 [#1] PREEMPT SMP KASAN IPv6: ADDRCONF(NETDEV_UP): veth0_virt_wifi: link is not ready Modules linked in: CPU: 1 PID: 7378 Comm: syz-executor.2 Not tainted 4.14.171-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff888089978400 task.stack: ffff8880a87b8000 RIP: 0010:nft_bitwise_ops+0x5/0x80 RSP: 0018:ffff8880a87bf088 EFLAGS: 00010286 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 1ffffffff1165ded RSI: ffff8880a87bf0d8 RDI: ffff8880a87bf138 RBP: ffff8880a87bf1c0 R08: dffffc0000000000 R09: 0000000000000000 R10: ffffed10150f7e2c R11: ffff8880a87bf167 R12: ffff8880a87bf138 R13: ffff888090a16dc0 R14: ffffffff88b2ef30 R15: ffff8880a87bf198 FS: 00007ff0c4c22700(0000) GS:ffff8880aed00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000280 CR3: 00000000a8725000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 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 nfnetlink_rcv_msg+0x89a/0xa70 net/netfilter/nfnetlink.c:214 netlink_rcv_skb+0x133/0x370 net/netlink/af_netlink.c:2432 nfnetlink_rcv+0x176/0x1570 net/netfilter/nfnetlink.c:515 audit: type=1400 audit(1582846727.813:41): avc: denied { write } for pid=7377 comm="syz-executor.2" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_netfilter_socket permissive=1 netlink_unicast_kernel net/netlink/af_netlink.c:1286 [inline] netlink_unicast+0x40b/0x600 net/netlink/af_netlink.c:1312 netlink_sendmsg+0x730/0xbd0 net/netlink/af_netlink.c:1877 IPv6: ADDRCONF(NETDEV_UP): veth1_macvtap: link is not ready 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+0x42/0xb7 RIP: 0033:0x45b349 RSP: 002b:00007ff0c4c21c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007ff0c4c226d4 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 IPv6: ADDRCONF(NETDEV_UP): veth0_vlan: link is not ready 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 50 54 4b 85 ff ff ff 00 00 00 00 00 00 00 00 30 00 00 00 00 00 00 00 80 58 IPv6: ADDRCONF(NETDEV_UP): vlan0: link is not ready RIP: nft_bitwise_ops+0x5/0x80 RSP: ffff8880a87bf088 ---[ end trace 5d5872db060e96c8 ]--- IPv6: ADDRCONF(NETDEV_UP): vlan1: link is not ready