KCSAN: data-race in wg_packet_handshake_receive_worker / wg_packet_rx_poll (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 495023e4 of: Drop superfluous ULL suffix for ~0
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15e97f14500000
kernel config: https://syzkaller.appspot.com/x/.config?x=76dfc991796328d4
dashboard link: https://syzkaller.appspot.com/bug?extid=9635fead3a2a5725b21f
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project.git 913f6005669cfb590c99865a90bc51ed0983d09d)
CC: [Ja...@zx2c4.com da...@davemloft.net ku...@kernel.org linux-...@vger.kernel.org net...@vger.kernel.org wire...@lists.zx2c4.com]

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+9635fe...@syzkaller.appspotmail.com

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

read-write to 0xffff88801c05d508 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:364 [inline]
wg_packet_rx_poll+0xfd9/0x1290 drivers/net/wireguard/receive.c:482
napi_poll+0x178/0x4c0 net/core/dev.c:6763
net_rx_action+0x17a/0x480 net/core/dev.c:6833
__do_softirq+0x12c/0x2b1 kernel/softirq.c:298
asm_call_irq_on_stack+0xf/0x20
__run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
do_softirq_own_stack+0x32/0x40 arch/x86/kernel/irq_64.c:77
do_softirq kernel/softirq.c:343 [inline]
__local_bh_enable_ip+0xba/0xd0 kernel/softirq.c:195
__raw_spin_unlock_bh include/linux/spinlock_api_smp.h:176 [inline]
_raw_spin_unlock_bh+0x33/0x40 kernel/locking/spinlock.c:207
spin_unlock_bh include/linux/spinlock.h:399 [inline]
ptr_ring_consume_bh include/linux/ptr_ring.h:367 [inline]
wg_packet_decrypt_worker+0x6f2/0x730 drivers/net/wireguard/receive.c:507
process_one_work+0x3e1/0x950 kernel/workqueue.c:2272
worker_thread+0x635/0xb90 kernel/workqueue.c:2418
kthread+0x1fa/0x220 kernel/kthread.c:292
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

read-write to 0xffff88801c05d508 of 8 bytes by task 10640 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+0x395/0x440 drivers/net/wireguard/receive.c:220
process_one_work+0x3e1/0x950 kernel/workqueue.c:2272
worker_thread+0x635/0xb90 kernel/workqueue.c:2418
kthread+0x1fa/0x220 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: 10640 Comm: kworker/0:6 Not tainted 5.10.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: wg-kex-wg1 wg_packet_handshake_receive_worker
==================================================================


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.