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KCSAN: data-race in __mod_timer / timer_clear_idle

Status: auto-closed as invalid on 2020/09/08 21:36
Subsystems: kernel
[Documentation on labels]
Reported-by: syzbot+645659910ad2e8adc671@syzkaller.appspotmail.com
First crash: 2003d, last: 1956d
▶ ▼ Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in __mod_timer / timer_clear_idle (4) kernel 6 1 1191d 1191d 0/29 auto-obsoleted due to no activity on 2022/10/14 01:10
upstream KCSAN: data-race in __mod_timer / timer_clear_idle (3) kernel 6 8 1698d 1805d 0/29 auto-closed as invalid on 2021/05/25 13:49
upstream KCSAN: data-race in __mod_timer / timer_clear_idle (2) kernel 6 1 1900d 1900d 0/29 auto-closed as invalid on 2020/11/04 00:53

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

write to 0xffff88812c01cb24 of 1 bytes by task 0 on cpu 0:
 timer_clear_idle+0x2e/0x40 kernel/time/timer.c:1687
 tick_nohz_idle_retain_tick+0x3e/0x40 kernel/time/tick-sched.c:1012
 cpuidle_idle_call kernel/sched/idle.c:210 [inline]
 do_idle+0x287/0x310 kernel/sched/idle.c:276
 cpu_startup_entry+0x15/0x20 kernel/sched/idle.c:372
 rest_init+0xd8/0xe0 init/main.c:705
 arch_call_rest_init+0xa/0xb
 start_kernel+0x608/0x6d0 init/main.c:1043
 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243

read to 0xffff88812c01cb24 of 1 bytes by task 381 on cpu 1:
 forward_timer_base kernel/time/timer.c:900 [inline]
 __mod_timer+0xa5b/0x1020 kernel/time/timer.c:1021
 add_timer+0x38/0x50 kernel/time/timer.c:1148
 __queue_delayed_work+0xea/0x150 kernel/workqueue.c:1649
 queue_delayed_work_on+0x8d/0xe0 kernel/workqueue.c:1674
 queue_delayed_work include/linux/workqueue.h:522 [inline]
 batadv_nc_start_timer net/batman-adv/network-coding.c:79 [inline]
 batadv_nc_worker+0x9f1/0xa00 net/batman-adv/network-coding.c:740
 process_one_work+0x3e1/0x9a0 kernel/workqueue.c:2269
 worker_thread+0x665/0xbe0 kernel/workqueue.c:2415
 kthread+0x20d/0x230 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 381 Comm: kworker/u4:3 Not tainted 5.8.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: bat_events batadv_nc_worker
==================================================================

Crashes (74):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/08/04 21:35 upstream c0842fbc1b18 02034dac .config console log report ci2-upstream-kcsan-gce
2020/08/03 14:35 upstream bcf876870b95 96dd3623 .config console log report ci2-upstream-kcsan-gce
2020/08/02 09:41 upstream ac3a0c847296 96dd3623 .config console log report ci2-upstream-kcsan-gce
2020/08/01 20:58 upstream d52daa8620c6 8df85ed9 .config console log report ci2-upstream-kcsan-gce
2020/07/30 22:20 upstream e2c46b5762c6 8df85ed9 .config console log report ci2-upstream-kcsan-gce
2020/07/30 18:13 upstream 83bdc7275e62 b0947553 .config console log report ci2-upstream-kcsan-gce
2020/07/29 21:32 upstream 6ba1b005ffc3 233283a1 .config console log report ci2-upstream-kcsan-gce
2020/07/27 21:05 upstream 92ed30191993 cb93dc6a .config console log report ci2-upstream-kcsan-gce
2020/07/26 09:55 upstream 04300d66f0a0 51265195 .config console log report ci2-upstream-kcsan-gce
2020/07/26 02:34 upstream 04300d66f0a0 1f7cc1ca .config console log report ci2-upstream-kcsan-gce
2020/07/25 05:59 upstream 68845a55c31b 0a13649c .config console log report ci2-upstream-kcsan-gce
2020/07/24 14:22 upstream f37e99aca03f 554af388 .config console log report ci2-upstream-kcsan-gce
2020/07/23 20:15 upstream d15be546031c 70c104a1 .config console log report ci2-upstream-kcsan-gce
2020/07/23 07:16 upstream d15be546031c 340ea530 .config console log report ci2-upstream-kcsan-gce
2020/07/22 15:46 upstream 4fa640dc5230 128cd85f .config console log report ci2-upstream-kcsan-gce
2020/07/22 03:14 upstream 4fa640dc5230 21f1765e .config console log report ci2-upstream-kcsan-gce
2020/07/21 17:47 upstream 4fa640dc5230 e562dd8a .config console log report ci2-upstream-kcsan-gce
2020/07/21 01:20 upstream 4fa640dc5230 8caeeeb7 .config console log report ci2-upstream-kcsan-gce
2020/07/20 13:21 upstream 5714ee50bb43 8caeeeb7 .config console log report ci2-upstream-kcsan-gce
2020/07/19 22:13 upstream 92188b41f139 9c812472 .config console log report ci2-upstream-kcsan-gce
2020/07/19 08:40 upstream f932d58abc38 9c812472 .config console log report ci2-upstream-kcsan-gce
2020/07/18 20:10 upstream 6cf7ccba29dc 9c812472 .config console log report ci2-upstream-kcsan-gce
2020/07/18 06:46 upstream 6a70f89cc58f 9c812472 .config console log report ci2-upstream-kcsan-gce
2020/07/16 20:15 upstream f8456690ba8e b090c643 .config console log report ci2-upstream-kcsan-gce
2020/07/16 01:23 upstream 994e99a96c9b ada108d0 .config console log report ci2-upstream-kcsan-gce
2020/07/14 02:09 upstream 0dc589da873b ce4c95b3 .config console log report ci2-upstream-kcsan-gce
2020/07/13 22:08 upstream 11ba468877bb ce4c95b3 .config console log report ci2-upstream-kcsan-gce
2020/07/13 15:09 upstream 11ba468877bb f90ec899 .config console log report ci2-upstream-kcsan-gce
2020/07/11 12:41 upstream 1df0d8960499 7ba05d2d .config console log report ci2-upstream-kcsan-gce
2020/07/11 02:17 upstream a581387e415b 18d18b59 .config console log report ci2-upstream-kcsan-gce
2020/07/09 08:09 upstream 0bddd227f3dc bc238812 .config console log report ci2-upstream-kcsan-gce
2020/07/08 19:25 upstream 63e1968a2c87 9f9845eb .config console log report ci2-upstream-kcsan-gce
2020/07/08 08:51 upstream dcde237b9b0e 5962a2dc .config console log report ci2-upstream-kcsan-gce
2020/07/07 22:29 upstream aa27b32b76d0 08fc4ef1 .config console log report ci2-upstream-kcsan-gce
2020/07/07 14:46 upstream bfe91da29bfa 42723355 .config console log report ci2-upstream-kcsan-gce
2020/07/06 22:43 upstream 5c82ec00dd00 ef278c73 .config console log report ci2-upstream-kcsan-gce
2020/07/05 19:12 upstream 45a5ac7a5cc3 22f87567 .config console log report ci2-upstream-kcsan-gce
2020/07/05 12:43 upstream 35e884f89df4 22f87567 .config console log report ci2-upstream-kcsan-gce
2020/07/04 13:28 upstream 35e884f89df4 4f739670 .config console log report ci2-upstream-kcsan-gce
2020/07/04 02:28 upstream 0c7d7d1fada7 51095195 .config console log report ci2-upstream-kcsan-gce
2020/07/03 19:26 upstream cdd3bb54332f 6e569755 .config console log report ci2-upstream-kcsan-gce
2020/07/02 12:04 upstream cd77006e01b3 f30c14bf .config console log report ci2-upstream-kcsan-gce
2020/07/02 04:06 upstream cd77006e01b3 bed10395 .config console log report ci2-upstream-kcsan-gce
2020/07/02 02:05 upstream edb543cfe5db bed10395 .config console log report ci2-upstream-kcsan-gce
2020/07/01 21:00 upstream edb543cfe5db 695ef2dd .config console log report ci2-upstream-kcsan-gce
2020/07/01 05:07 upstream 7c30b859a947 c0383ebe .config console log report ci2-upstream-kcsan-gce
2020/06/30 22:18 upstream 7c30b859a947 c0383ebe .config console log report ci2-upstream-kcsan-gce
2020/06/30 21:17 upstream 7c30b859a947 c0383ebe .config console log report ci2-upstream-kcsan-gce
2020/06/30 00:07 upstream 7c30b859a947 917afeaa .config console log report ci2-upstream-kcsan-gce
2020/06/29 12:09 upstream 9ebcfadb0610 df01f6fc .config console log report ci2-upstream-kcsan-gce
2020/06/29 09:36 upstream 9ebcfadb0610 0375051c .config console log report ci2-upstream-kcsan-gce
2020/06/28 22:49 upstream 91a9a90d040e a2cdad9d .config console log report ci2-upstream-kcsan-gce
2020/06/27 22:28 upstream 6116dea80dfd a2cdad9d .config console log report ci2-upstream-kcsan-gce
2020/06/27 20:05 upstream 6116dea80dfd a2cdad9d .config console log report ci2-upstream-kcsan-gce
2020/06/27 05:17 upstream 1590a2e1c681 ffec44b5 .config console log report ci2-upstream-kcsan-gce
2020/06/27 05:14 upstream 1590a2e1c681 ffec44b5 .config console log report ci2-upstream-kcsan-gce
2020/06/26 23:40 upstream 1590a2e1c681 ffec44b5 .config console log report ci2-upstream-kcsan-gce
2020/06/26 21:37 upstream 1590a2e1c681 349959fb .config console log report ci2-upstream-kcsan-gce
2020/06/26 08:36 upstream 4a21185cda0f aea82c00 .config console log report ci2-upstream-kcsan-gce
2020/06/26 02:54 upstream 4a21185cda0f aea82c00 .config console log report ci2-upstream-kcsan-gce
2020/06/25 23:51 upstream 908f7d12d3ba aea82c00 .config console log report ci2-upstream-kcsan-gce
2020/06/25 12:30 upstream 8be3a53e18e0 c7b4497a .config console log report ci2-upstream-kcsan-gce
2020/06/24 21:28 upstream 26e122e97a3d 9d60b18e .config console log report ci2-upstream-kcsan-gce
2020/06/24 12:47 upstream 3e08a95294a4 41694dbf .config console log report ci2-upstream-kcsan-gce
2020/06/24 11:54 upstream 3e08a95294a4 41694dbf .config console log report ci2-upstream-kcsan-gce
2020/06/24 11:50 upstream 3e08a95294a4 41694dbf .config console log report ci2-upstream-kcsan-gce
2020/06/24 11:18 upstream 3e08a95294a4 41694dbf .config console log report ci2-upstream-kcsan-gce
2020/06/24 03:55 upstream 3e08a95294a4 bbad15ae .config console log report ci2-upstream-kcsan-gce
2020/06/23 18:21 upstream 3e08a95294a4 6930bbef .config console log report ci2-upstream-kcsan-gce
2020/06/20 00:13 upstream 672f9255a727 123cf502 .config console log report ci2-upstream-kcsan-gce
2020/06/19 02:42 upstream 5e857ce6eae7 bc258b50 .config console log report ci2-upstream-kcsan-gce
* Struck through repros no longer work on HEAD.