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KCSAN: data-race in __mod_timer / __mod_timer (5)

Status: auto-closed as invalid on 2021/05/17 11:47
Subsystems: wireguard
[Documentation on labels]
First crash: 1575d, last: 1566d
Similar bugs (9)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in __mod_timer / __mod_timer (10) wireguard 6 30 577d 785d 0/29 auto-obsoleted due to no activity on 2024/01/30 05:54
upstream KCSAN: data-race in __mod_timer / __mod_timer wireguard 6 1 1852d 1852d 0/29 auto-closed as invalid on 2020/08/03 09:45
upstream KCSAN: data-race in __mod_timer / __mod_timer (6) block 6 1 1381d 1381d 0/29 auto-closed as invalid on 2021/11/17 13:29
upstream KCSAN: data-race in __mod_timer / __mod_timer (2) wireguard 6 6 1691d 1691d 0/29 auto-closed as invalid on 2021/01/11 09:46
upstream KCSAN: data-race in __mod_timer / __mod_timer (8) wireguard 6 19 1042d 1226d 0/29 auto-obsoleted due to no activity on 2022/10/22 07:18
upstream KCSAN: data-race in __mod_timer / __mod_timer (3) wireguard 6 1 1653d 1653d 0/29 auto-closed as invalid on 2021/02/18 17:11
upstream KCSAN: data-race in __mod_timer / __mod_timer (9) wireguard 6 20 827d 1004d 0/29 auto-obsoleted due to no activity on 2023/05/25 03:36
upstream KCSAN: data-race in __mod_timer / __mod_timer (4) wireguard 6 1 1615d 1615d 0/29 auto-closed as invalid on 2021/03/28 20:33
upstream KCSAN: data-race in __mod_timer / __mod_timer (7) wireguard 6 11 1269d 1337d 0/29 auto-closed as invalid on 2022/03/10 01:23

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

write to 0xffff88813a67dc10 of 8 bytes by task 521 on cpu 1:
 __mod_timer+0x9cd/0xc10 kernel/time/timer.c:1010
 mod_timer+0x1b/0x20 kernel/time/timer.c:1106
 mod_peer_timer drivers/net/wireguard/timers.c:37 [inline]
 wg_timers_any_authenticated_packet_traversal+0xc5/0xf0 drivers/net/wireguard/timers.c:215
 wg_packet_create_data_done drivers/net/wireguard/send.c:247 [inline]
 wg_packet_tx_worker+0xf7/0x360 drivers/net/wireguard/send.c:276
 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:294

read to 0xffff88813a67dc10 of 8 bytes by task 9279 on cpu 0:
 __mod_timer+0x74/0xc10 kernel/time/timer.c:978
 mod_timer+0x1b/0x20 kernel/time/timer.c:1106
 mod_peer_timer drivers/net/wireguard/timers.c:37 [inline]
 wg_timers_any_authenticated_packet_traversal+0xc5/0xf0 drivers/net/wireguard/timers.c:215
 wg_receive_handshake_packet drivers/net/wireguard/receive.c:209 [inline]
 wg_packet_handshake_receive_worker+0x401/0x450 drivers/net/wireguard/receive.c:220
 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:294

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 9279 Comm: kworker/0:5 Tainted: G        W         5.12.0-rc6-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
==================================================================

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/04/11 21:47 upstream 7d900724913c 6a81331a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in __mod_timer / __mod_timer
2021/04/02 10:51 upstream 1678e493d530 6a81331a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in __mod_timer / __mod_timer
* Struck through repros no longer work on HEAD.