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KCSAN: data-race in wg_packet_handshake_receive_worker / wg_packet_rx_poll (5)

Status: auto-obsoleted due to no activity on 2023/09/29 02:04
Subsystems: wireguard
[Documentation on labels]
Reported-by: syzbot+80a98381230162731266@syzkaller.appspotmail.com
First crash: 186d, last: 180d
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [wireguard?] KCSAN: data-race in wg_packet_handshake_receive_worker / wg_packet_rx_poll (5) 0 (1) 2023/08/28 14:37
Similar bugs (6)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in wg_packet_handshake_receive_worker / wg_packet_rx_poll (7) wireguard 1 43d 39d 0/26 auto-obsoleted due to no activity on 2024/02/12 20:57
upstream KCSAN: data-race in wg_packet_handshake_receive_worker / wg_packet_rx_poll (6) wireguard 3 86d 81d 0/26 auto-obsoleted due to no activity on 2024/01/01 00:52
upstream KCSAN: data-race in wg_packet_handshake_receive_worker / wg_packet_rx_poll (3) wireguard 2 768d 742d 0/26 auto-closed as invalid on 2022/02/22 09:23
upstream KCSAN: data-race in wg_packet_handshake_receive_worker / wg_packet_rx_poll wireguard 3 1272d 1292d 0/26 auto-closed as invalid on 2020/10/01 18:48
upstream KCSAN: data-race in wg_packet_handshake_receive_worker / wg_packet_rx_poll (4) wireguard 1 294d 294d 0/26 auto-obsoleted due to no activity on 2023/06/06 16:15
upstream KCSAN: data-race in wg_packet_handshake_receive_worker / wg_packet_rx_poll (2) wireguard 1 1205d 1166d 0/26 auto-closed as invalid on 2020/12/25 11:24

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

read-write to 0xffff88813939a178 of 8 bytes by interrupt on cpu 0:
 wg_packet_rx_poll+0xb43/0xf80 drivers/net/wireguard/receive.c:474
 __napi_poll+0x60/0x3b0 net/core/dev.c:6460
 napi_poll net/core/dev.c:6527 [inline]
 net_rx_action+0x32b/0x750 net/core/dev.c:6660
 __do_softirq+0xc1/0x265 kernel/softirq.c:553
 do_softirq+0x5e/0x90 kernel/softirq.c:454
 __local_bh_enable_ip+0x64/0x70 kernel/softirq.c:381
 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:167 [inline]
 _raw_spin_unlock_bh+0x36/0x40 kernel/locking/spinlock.c:210
 spin_unlock_bh include/linux/spinlock.h:396 [inline]
 ptr_ring_consume_bh include/linux/ptr_ring.h:367 [inline]
 wg_packet_handshake_receive_worker+0x184/0x5d0 drivers/net/wireguard/receive.c:212
 process_one_work+0x434/0x860 kernel/workqueue.c:2600
 worker_thread+0x5f2/0xa10 kernel/workqueue.c:2751
 kthread+0x1d7/0x210 kernel/kthread.c:389
 ret_from_fork+0x2e/0x40 arch/x86/kernel/process.c:145
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304

read-write to 0xffff88813939a178 of 8 bytes by task 8583 on cpu 1:
 update_rx_stats drivers/net/wireguard/receive.c:23 [inline]
 wg_receive_handshake_packet drivers/net/wireguard/receive.c:198 [inline]
 wg_packet_handshake_receive_worker+0x4b2/0x5d0 drivers/net/wireguard/receive.c:213
 process_one_work+0x434/0x860 kernel/workqueue.c:2600
 worker_thread+0x5f2/0xa10 kernel/workqueue.c:2751
 kthread+0x1d7/0x210 kernel/kthread.c:389
 ret_from_fork+0x2e/0x40 arch/x86/kernel/process.c:145
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304

value changed: 0x00000000000077a0 -> 0x00000000000077c0

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 8583 Comm: kworker/1:14 Tainted: G        W          6.5.0-rc7-syzkaller-00024-g93f5de5f648d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
Workqueue: wg-kex-wg2 wg_packet_handshake_receive_worker
==================================================================

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/08/25 02:03 upstream 93f5de5f648d 49be837e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in wg_packet_handshake_receive_worker / wg_packet_rx_poll
2023/08/19 06:32 upstream d4ddefee5160 d216d8a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in wg_packet_handshake_receive_worker / wg_packet_rx_poll
* Struck through repros no longer work on HEAD.