[syzbot] KCSAN: data-race in wg_packet_handshake_receive_worker / wg_packet_rx_poll (3)

syzbot
2022-02-08T09:13:35Z

Hello,

syzbot found the following issue on:

HEAD commit: 455e73a07f6e Merge tag 'clk-for-linus' of git://git.kernel..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=131009feb00000
kernel config: https://syzkaller.appspot.com/x/.config?x=e1f9a6122410716
dashboard link: https://syzkaller.appspot.com/bug?extid=ed414b05fe54c96947f8
compiler: Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.2

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ed414b05fe54c96947f8@syzkaller.appspotmail.com

==================================================================
BUG: KCSAN: data-race in wg_packet_handshake_receive_worker / wg_packet_rx_poll

read to 0xffff88813238a9e0 of 8 bytes by interrupt on cpu 1:
update_rx_stats drivers/net/wireguard/receive.c:28 [inline]
wg_packet_consume_data_done drivers/net/wireguard/receive.c:365 [inline]
wg_packet_rx_poll+0xf6b/0x11f0 drivers/net/wireguard/receive.c:481
__napi_poll+0x65/0x3f0 net/core/dev.c:6365
napi_poll net/core/dev.c:6432 [inline]
net_rx_action+0x29e/0x650 net/core/dev.c:6519
__do_softirq+0x158/0x2de kernel/softirq.c:558
do_softirq+0xb1/0xf0 kernel/softirq.c:459
__local_bh_enable_ip+0x68/0x70 kernel/softirq.c:383
__raw_spin_unlock_bh include/linux/spinlock_api_smp.h:167 [inline]
_raw_spin_unlock_bh+0x33/0x40 kernel/locking/spinlock.c:210
spin_unlock_bh include/linux/spinlock.h:394 [inline]
ptr_ring_consume_bh include/linux/ptr_ring.h:367 [inline]
wg_packet_decrypt_worker+0x73c/0x780 drivers/net/wireguard/receive.c:506
process_one_work+0x3f6/0x960 kernel/workqueue.c:2307
worker_thread+0x616/0xa70 kernel/workqueue.c:2454
kthread+0x2c7/0x2e0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30

write to 0xffff88813238a9e0 of 8 bytes by task 5035 on cpu 0:
update_rx_stats drivers/net/wireguard/receive.c:28 [inline]
wg_receive_handshake_packet drivers/net/wireguard/receive.c:205 [inline]
wg_packet_handshake_receive_worker+0x54a/0x6e0 drivers/net/wireguard/receive.c:220
process_one_work+0x3f6/0x960 kernel/workqueue.c:2307
worker_thread+0x616/0xa70 kernel/workqueue.c:2454
kthread+0x2c7/0x2e0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30

value changed: 0x0000000000000aa8 -> 0x0000000000000ac8

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 5035 Comm: kworker/0:60 Not tainted 5.16.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: wg-kex-wg2 wg_packet_handshake_receive_worker
==================================================================

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