bisecting fixing commit since 14b58326976de6ef3998eefec1dd7f8b38b97a75
building syzkaller on bc15f7dbbc1c6e2042a7115b3fdacc0ada8c35e7
testing commit 14b58326976de6ef3998eefec1dd7f8b38b97a75 with gcc (GCC) 8.1.0
kernel signature: b7da8dfdb64c5d25884614137d0286b5d7164d22d9c2f7707cd405267b3397f5
all runs: crashed: general protection fault in get_unique_tuple
testing current HEAD 458a534cac0c808fce164cc961f8384ffc8c455e
testing commit 458a534cac0c808fce164cc961f8384ffc8c455e with gcc (GCC) 8.1.0
kernel signature: 46abb8303221a71699d70944887ef3fe1af5565af77e0f106e197c5cc82760c4
all runs: crashed: general protection fault in get_unique_tuple
revisions tested: 2, total time: 28m52.856752857s (build: 21m28.108750053s, test: 5m46.352381175s)
the crash still happens on HEAD
commit msg: Linux 4.14.197
crash: general protection fault in get_unique_tuple
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
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
Modules linked in:
CPU: 1 PID: 7822 Comm: syz-executor.4 Not tainted 4.14.197-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8880a549c400 task.stack: ffff8880a4b70000
RIP: 0010:__read_once_size include/linux/compiler.h:183 [inline]
RIP: 0010:__nf_nat_l4proto_find net/netfilter/nf_nat_core.c:54 [inline]
RIP: 0010:get_unique_tuple+0x209/0x1f70 net/netfilter/nf_nat_core.c:313
RSP: 0018:ffff8880a4b76d28 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff8880a4b76ef8 RCX: 1ffffffff1167b64
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff88b3db20
RBP: ffff8880a4b76e48 R08: 1ffff11014a93990 R09: 0000000000000000
R10: 0000000000000050 R11: ffff8880a549c400 R12: ffff8880a4b76e98
R13: ffff8880a4b77018 R14: 0000000000000000 R15: ffff8880a4b76ebe
FS:  00007f93e41bd700(0000) GS:ffff8880aed00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000300 CR3: 0000000088027000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 nf_nat_setup_info+0x180/0x720 net/netfilter/nf_nat_core.c:407
IPv6: ADDRCONF(NETDEV_UP): batadv_slave_1: link is not ready
batman_adv: batadv0: Interface activated: batadv_slave_1
IPv6: ADDRCONF(NETDEV_UP): veth0_to_batadv: link is not ready
IPv6: ADDRCONF(NETDEV_UP): veth1_to_batadv: link is not ready
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
 __nf_nat_alloc_null_binding+0xfd/0x180 net/netfilter/nf_nat_core.c:466
 nfnetlink_parse_nat_setup+0x2c5/0x330 net/netfilter/nf_nat_core.c:782
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
 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
IPv6: ADDRCONF(NETDEV_UP): batadv_slave_0: link is not ready
batman_adv: batadv0: Interface activated: batadv_slave_0
 ctnetlink_new_conntrack+0x432/0xd2b net/netfilter/nf_conntrack_netlink.c:1964
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
 nfnetlink_rcv_msg+0x872/0xa60 net/netfilter/nfnetlink.c:214
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1
 netlink_rcv_skb+0x12f/0x3b0 net/netlink/af_netlink.c:2433
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
 nfnetlink_rcv+0x176/0x15b0 net/netfilter/nfnetlink.c:515
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
IPv6: ADDRCONF(NETDEV_UP): batadv_slave_1: link is not ready
batman_adv: batadv0: Interface activated: batadv_slave_1
 netlink_unicast_kernel net/netlink/af_netlink.c:1287 [inline]
 netlink_unicast+0x40b/0x610 net/netlink/af_netlink.c:1313
 netlink_sendmsg+0x657/0xc60 net/netlink/af_netlink.c:1878
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xac/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: 0033:0x45d189
RSP: 002b:00007f93e41bcc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000028580 RCX: 000000000045d189
RDX: 0000000000000000 RSI: 0000000020000300 RDI: 0000000000000003
RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c
R13: 00007ffd7619ec2f R14: 00007f93e41bd9c0 R15: 000000000118cf4c
Code: 48 c1 e9 03 80 3c 11 00 0f 85 bc 17 00 00 4a 8b 14 f5 60 da b3 88 4c 8d 34 c2 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 <80> 3c 02 00 0f 85 b6 17 00 00 49 8b 06 48 89 85 40 ff ff ff e8 
RIP: __read_once_size include/linux/compiler.h:183 [inline] RSP: ffff8880a4b76d28
RIP: __nf_nat_l4proto_find net/netfilter/nf_nat_core.c:54 [inline] RSP: ffff8880a4b76d28
RIP: get_unique_tuple+0x209/0x1f70 net/netfilter/nf_nat_core.c:313 RSP: ffff8880a4b76d28
device veth1_macvtap entered promiscuous mode
---[ end trace 6219e6aa35037172 ]---