syzbot


KCSAN: data-race in wg_packet_receive / wg_packet_receive (3)

Status: auto-closed as invalid on 2022/07/11 09:31
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 187d, last: 183d
similar bugs (3):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in wg_packet_receive / wg_packet_receive 2 370d 387d 0/24 auto-closed as invalid on 2022/01/05 08:53
upstream KCSAN: data-race in wg_packet_receive / wg_packet_receive (4) 2 89d 91d 0/24 auto-obsoleted due to no activity on 2022/10/12 22:27
upstream KCSAN: data-race in wg_packet_receive / wg_packet_receive (2) 1 239d 239d 0/24 auto-closed as invalid on 2022/05/15 18:55

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

write to 0xffff8881370bfcc8 of 4 bytes by interrupt on cpu 0:
 wg_cpumask_next_online drivers/net/wireguard/queueing.h:133 [inline]
 wg_packet_receive+0x7de/0xdb0 drivers/net/wireguard/receive.c:575
 wg_receive+0x4a/0x70 drivers/net/wireguard/socket.c:326
 udpv6_queue_rcv_one_skb+0xa62/0xb70 net/ipv6/udp.c:704
 udpv6_queue_rcv_skb+0x2c1/0x2e0 net/ipv6/udp.c:762
 udp6_unicast_rcv_skb+0x16b/0x190 net/ipv6/udp.c:905
 __udp6_lib_rcv+0x7ec/0x910 net/ipv6/udp.c:990
 udpv6_rcv+0x1d/0x20 net/ipv6/udp.c:1098
 ip6_protocol_deliver_rcu+0x882/0xd40 net/ipv6/ip6_input.c:436
 ip6_input_finish net/ipv6/ip6_input.c:481 [inline]
 NF_HOOK include/linux/netfilter.h:307 [inline]
 ip6_input+0xca/0x180 net/ipv6/ip6_input.c:490
 dst_input include/net/dst.h:461 [inline]
 ip6_rcv_finish+0x1de/0x270 net/ipv6/ip6_input.c:76
 NF_HOOK include/linux/netfilter.h:307 [inline]
 ipv6_rcv+0x85/0x140 net/ipv6/ip6_input.c:306
 __netif_receive_skb_one_core net/core/dev.c:5478 [inline]
 __netif_receive_skb+0x8b/0x1b0 net/core/dev.c:5592
 process_backlog+0x23f/0x3b0 net/core/dev.c:5920
 __napi_poll+0x65/0x390 net/core/dev.c:6486
 napi_poll net/core/dev.c:6553 [inline]
 net_rx_action+0x37e/0x730 net/core/dev.c:6664
 __do_softirq+0x158/0x2e3 kernel/softirq.c:571
 do_softirq+0xb1/0xf0 kernel/softirq.c:472
 __local_bh_enable_ip+0x6f/0x80 kernel/softirq.c:396
 __raw_read_unlock_bh include/linux/rwlock_api_smp.h:257 [inline]
 _raw_read_unlock_bh+0x17/0x20 kernel/locking/spinlock.c:284
 wg_socket_send_skb_to_peer+0x107/0x120 drivers/net/wireguard/socket.c:184
 wg_socket_send_buffer_to_peer+0xd2/0xf0 drivers/net/wireguard/socket.c:200
 wg_packet_send_handshake_initiation drivers/net/wireguard/send.c:40 [inline]
 wg_packet_handshake_send_worker+0x109/0x150 drivers/net/wireguard/send.c:51
 process_one_work+0x3d3/0x720 kernel/workqueue.c:2289
 worker_thread+0x618/0xa70 kernel/workqueue.c:2436
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30

read to 0xffff8881370bfcc8 of 4 bytes by interrupt on cpu 1:
 wg_cpumask_next_online drivers/net/wireguard/queueing.h:129 [inline]
 wg_packet_receive+0x798/0xdb0 drivers/net/wireguard/receive.c:575
 wg_receive+0x4a/0x70 drivers/net/wireguard/socket.c:326
 udpv6_queue_rcv_one_skb+0xa62/0xb70 net/ipv6/udp.c:704
 udpv6_queue_rcv_skb+0x2c1/0x2e0 net/ipv6/udp.c:762
 udp6_unicast_rcv_skb+0x16b/0x190 net/ipv6/udp.c:905
 __udp6_lib_rcv+0x7ec/0x910 net/ipv6/udp.c:990
 udpv6_rcv+0x1d/0x20 net/ipv6/udp.c:1098
 ip6_protocol_deliver_rcu+0x882/0xd40 net/ipv6/ip6_input.c:436
 ip6_input_finish net/ipv6/ip6_input.c:481 [inline]
 NF_HOOK include/linux/netfilter.h:307 [inline]
 ip6_input+0xca/0x180 net/ipv6/ip6_input.c:490
 dst_input include/net/dst.h:461 [inline]
 ip6_rcv_finish+0x1de/0x270 net/ipv6/ip6_input.c:76
 NF_HOOK include/linux/netfilter.h:307 [inline]
 ipv6_rcv+0x85/0x140 net/ipv6/ip6_input.c:306
 __netif_receive_skb_one_core net/core/dev.c:5478 [inline]
 __netif_receive_skb+0x8b/0x1b0 net/core/dev.c:5592
 process_backlog+0x23f/0x3b0 net/core/dev.c:5920
 __napi_poll+0x65/0x390 net/core/dev.c:6486
 napi_poll net/core/dev.c:6553 [inline]
 net_rx_action+0x37e/0x730 net/core/dev.c:6664
 __do_softirq+0x158/0x2e3 kernel/softirq.c:571
 do_softirq+0xb1/0xf0 kernel/softirq.c:472
 __local_bh_enable_ip+0x6f/0x80 kernel/softirq.c:396
 __raw_read_unlock_bh include/linux/rwlock_api_smp.h:257 [inline]
 _raw_read_unlock_bh+0x17/0x20 kernel/locking/spinlock.c:284
 wg_socket_send_skb_to_peer+0x107/0x120 drivers/net/wireguard/socket.c:184
 wg_socket_send_buffer_to_peer+0xd2/0xf0 drivers/net/wireguard/socket.c:200
 wg_packet_send_handshake_initiation drivers/net/wireguard/send.c:40 [inline]
 wg_packet_handshake_send_worker+0x109/0x150 drivers/net/wireguard/send.c:51
 process_one_work+0x3d3/0x720 kernel/workqueue.c:2289
 worker_thread+0x618/0xa70 kernel/workqueue.c:2436
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30

value changed: 0x00000000 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 13877 Comm: kworker/u4:5 Not tainted 5.19.0-rc1-syzkaller-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/13/2022
Workqueue: wg-kex-wg1 wg_packet_handshake_send_worker
==================================================================

Crashes (2):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-upstream-kcsan-gce 2022/06/06 09:23 upstream f2906aa86338 c8857892 .config log report info KCSAN: data-race in wg_packet_receive / wg_packet_receive
ci2-upstream-kcsan-gce 2022/06/01 23:24 upstream 8eca6b0a647a b4bc6a3d .config log report info KCSAN: data-race in wg_packet_receive / wg_packet_receive
* Struck through repros no longer work on HEAD.