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KCSAN: data-race in __neigh_event_send / neigh_resolve_output (5)

Status: auto-closed as invalid on 2021/03/11 01:25
Subsystems: net
[Documentation on labels]
First crash: 1229d, last: 1202d
Similar bugs (6)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in __neigh_event_send / neigh_resolve_output (6) net 2 855d 890d 0/26 auto-closed as invalid on 2022/02/20 22:06
upstream KCSAN: data-race in __neigh_event_send / neigh_resolve_output (4) net 1 1304d 1304d 0/26 auto-closed as invalid on 2020/11/28 17:46
upstream KCSAN: data-race in __neigh_event_send / neigh_resolve_output net 5 1647d 1671d 0/26 auto-closed as invalid on 2020/01/25 19:36
upstream KCSAN: data-race in __neigh_event_send / neigh_resolve_output (2) net 1 1573d 1573d 0/26 auto-closed as invalid on 2020/04/08 18:47
upstream KCSAN: data-race in __neigh_event_send / neigh_resolve_output (3) net 1 1432d 1432d 0/26 auto-closed as invalid on 2020/07/24 05:33
upstream KCSAN: data-race in __neigh_event_send / neigh_resolve_output (7) net 43 405d 379d 22/26 fixed on 2023/06/08 14:41

Sample crash report:
==================================================================
BUG: KCSAN: data-race in __neigh_event_send / neigh_resolve_output

write to 0xffff88801f073885 of 1 bytes by task 3184 on cpu 1:
 __neigh_event_send+0x40c/0xad0 net/core/neighbour.c:1128
 neigh_event_send include/net/neighbour.h:444 [inline]
 neigh_resolve_output+0x104/0x410 net/core/neighbour.c:1476
 neigh_output include/net/neighbour.h:510 [inline]
 ip6_finish_output2+0x985/0xb20 net/ipv6/ip6_output.c:117
 __ip6_finish_output+0x428/0x480 net/ipv6/ip6_output.c:182
 ip6_finish_output+0x39/0x160 net/ipv6/ip6_output.c:192
 NF_HOOK_COND include/linux/netfilter.h:290 [inline]
 ip6_output+0x10e/0x210 net/ipv6/ip6_output.c:215
 dst_output include/net/dst.h:441 [inline]
 ip6_local_out+0x60/0x80 net/ipv6/output_core.c:179
 ip6tunnel_xmit include/net/ip6_tunnel.h:160 [inline]
 udp_tunnel6_xmit_skb+0x2f9/0x490 net/ipv6/ip6_udp_tunnel.c:109
 send6+0x2d8/0x3a0 drivers/net/wireguard/socket.c:152
 wg_socket_send_skb_to_peer drivers/net/wireguard/socket.c:177 [inline]
 wg_socket_send_buffer_to_peer+0x186/0x210 drivers/net/wireguard/socket.c:199
 wg_packet_send_handshake_initiation drivers/net/wireguard/send.c:40 [inline]
 wg_packet_handshake_send_worker+0xf9/0x140 drivers/net/wireguard/send.c:51
 process_one_work+0x3e1/0x950 kernel/workqueue.c:2275
 worker_thread+0x616/0xa70 kernel/workqueue.c:2421
 kthread+0x20b/0x230 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

read to 0xffff88801f073885 of 1 bytes by task 13760 on cpu 0:
 neigh_event_send include/net/neighbour.h:443 [inline]
 neigh_resolve_output+0x6f/0x410 net/core/neighbour.c:1476
 neigh_output include/net/neighbour.h:510 [inline]
 ip6_finish_output2+0x985/0xb20 net/ipv6/ip6_output.c:117
 __ip6_finish_output+0x428/0x480 net/ipv6/ip6_output.c:182
 ip6_finish_output+0x39/0x160 net/ipv6/ip6_output.c:192
 NF_HOOK_COND include/linux/netfilter.h:290 [inline]
 ip6_output+0x10e/0x210 net/ipv6/ip6_output.c:215
 dst_output include/net/dst.h:441 [inline]
 ip6_local_out+0x60/0x80 net/ipv6/output_core.c:179
 ip6tunnel_xmit include/net/ip6_tunnel.h:160 [inline]
 udp_tunnel6_xmit_skb+0x2f9/0x490 net/ipv6/ip6_udp_tunnel.c:109
 send6+0x2d8/0x3a0 drivers/net/wireguard/socket.c:152
 wg_socket_send_skb_to_peer drivers/net/wireguard/socket.c:177 [inline]
 wg_socket_send_buffer_to_peer+0x186/0x210 drivers/net/wireguard/socket.c:199
 wg_packet_send_handshake_initiation drivers/net/wireguard/send.c:40 [inline]
 wg_packet_handshake_send_worker+0xf9/0x140 drivers/net/wireguard/send.c:51
 process_one_work+0x3e1/0x950 kernel/workqueue.c:2275
 worker_thread+0x616/0xa70 kernel/workqueue.c:2421
 kthread+0x20b/0x230 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 13760 Comm: kworker/u4:6 Not tainted 5.11.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: wg-kex-wg0 wg_packet_handshake_send_worker
==================================================================

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/02/04 01:25 upstream 3afe9076a7c1 624dad51 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in __neigh_event_send / neigh_resolve_output
2021/01/08 05:03 upstream f5e6c330254a c104d4a3 .config console log report info ci2-upstream-kcsan-gce
* Struck through repros no longer work on HEAD.