KCSAN: data-race in inactive_list_is_low / snapshot_refaults

Status: auto-closed as invalid on 2020/02/20 01:07
Subsystems: mm
[Documentation on labels]
First crash: 2539d, last: 2489d

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

read to 0xffff8880a4c0b478 of 8 bytes by task 12952 on cpu 0:
 inactive_list_is_low+0x1d4/0x450 mm/vmscan.c:2257
 shrink_list mm/vmscan.c:2280 [inline]
 shrink_node_memcg+0x599/0xf80 mm/vmscan.c:2603
 shrink_node+0x164/0xb30 mm/vmscan.c:2808
 shrink_zones mm/vmscan.c:3025 [inline]
 do_try_to_free_pages+0x242/0x940 mm/vmscan.c:3083
 try_to_free_mem_cgroup_pages+0x1fd/0x4c0 mm/vmscan.c:3383
 reclaim_high.constprop.0+0xf7/0x140 mm/memcontrol.c:2349
 mem_cgroup_handle_over_high+0x96/0x180 mm/memcontrol.c:2430
 tracehook_notify_resume include/linux/tracehook.h:197 [inline]
 exit_to_usermode_loop+0x20c/0x2c0 arch/x86/entry/common.c:163
 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
 do_syscall_64+0x353/0x370 arch/x86/entry/common.c:300
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff8880a4c0b478 of 8 bytes by task 25920 on cpu 1:
 snapshot_refaults+0x170/0x200 mm/vmscan.c:3046
 do_try_to_free_pages+0x6e8/0x940 mm/vmscan.c:3105
 try_to_free_mem_cgroup_pages+0x1fd/0x4c0 mm/vmscan.c:3383
 reclaim_high.constprop.0+0xf7/0x140 mm/memcontrol.c:2349
 mem_cgroup_handle_over_high+0x96/0x180 mm/memcontrol.c:2430
 tracehook_notify_resume include/linux/tracehook.h:197 [inline]
 exit_to_usermode_loop+0x20c/0x2c0 arch/x86/entry/common.c:163
 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
 syscall_return_slowpath+0x20f/0x220 arch/x86/entry/common.c:274
 ret_from_fork+0x15/0x30 arch/x86/entry/entry_64.S:344

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 25920 Comm: syz-executor.0 Not tainted 5.4.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (23):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/12/12 00:58 https://github.com/google/ktsan.git kcsan ef798c30ba4e 0d368675 .config console log report ci2-upstream-kcsan-gce
2019/12/11 01:04 https://github.com/google/ktsan.git kcsan ef798c30ba4e 101194eb .config console log report ci2-upstream-kcsan-gce
2019/12/09 16:03 https://github.com/google/ktsan.git kcsan ef798c30ba4e b31eda3d .config console log report ci2-upstream-kcsan-gce
2019/12/08 08:24 https://github.com/google/ktsan.git kcsan ef798c30ba4e 1508f453 .config console log report ci2-upstream-kcsan-gce
2019/12/07 12:20 https://github.com/google/ktsan.git kcsan ef798c30ba4e 85f26751 .config console log report ci2-upstream-kcsan-gce
2019/12/05 08:35 https://github.com/google/ktsan.git kcsan ef798c30ba4e b2088328 .config console log report ci2-upstream-kcsan-gce
2019/12/01 21:15 https://github.com/google/ktsan.git kcsan ef798c30ba4e f879db37 .config console log report ci2-upstream-kcsan-gce
2019/12/01 06:08 https://github.com/google/ktsan.git kcsan ef798c30ba4e a76bf83f .config console log report ci2-upstream-kcsan-gce
2019/11/30 10:38 https://github.com/google/ktsan.git kcsan ef798c30ba4e 3a75be00 .config console log report ci2-upstream-kcsan-gce
2019/11/29 15:29 https://github.com/google/ktsan.git kcsan ef798c30ba4e 4f7e1d0f .config console log report ci2-upstream-kcsan-gce
2019/11/29 03:03 https://github.com/google/ktsan.git kcsan ef798c30ba4e 76357d6f .config console log report ci2-upstream-kcsan-gce
2019/11/27 00:45 https://github.com/google/ktsan.git kcsan ef798c30ba4e 1048481f .config console log report ci2-upstream-kcsan-gce
2019/11/22 14:57 https://github.com/google/ktsan.git kcsan 5863cc791e4c 598ca6c8 .config console log report ci2-upstream-kcsan-gce
2019/11/22 01:50 https://github.com/google/ktsan.git kcsan 5863cc791e4c 8098ea0f .config console log report ci2-upstream-kcsan-gce
2019/11/19 18:01 https://github.com/google/ktsan.git kcsan 5863cc791e4c 432c7650 .config console log report ci2-upstream-kcsan-gce
2019/11/16 12:00 https://github.com/google/ktsan.git kcsan 5863cc791e4c cdac920b .config console log report ci2-upstream-kcsan-gce
2019/11/12 14:03 https://github.com/google/ktsan.git kcsan 7f2955e0d056 048f2d49 .config console log report ci2-upstream-kcsan-gce
2019/11/09 23:13 https://github.com/google/ktsan.git kcsan 94c006602e13 dc438b91 .config console log report ci2-upstream-kcsan-gce
2019/11/08 09:26 https://github.com/google/ktsan.git kcsan 94c006602e13 1e35461e .config console log report ci2-upstream-kcsan-gce
2019/11/02 22:12 https://github.com/google/ktsan.git kcsan 05f2236801fe d603afc9 .config console log report ci2-upstream-kcsan-gce
2019/10/28 18:44 https://github.com/google/ktsan.git kcsan 05f2236801fe 439d7b14 .config console log report ci2-upstream-kcsan-gce
2019/10/26 03:17 https://github.com/google/ktsan.git kcsan 05f2236801fe 413926c5 .config console log report ci2-upstream-kcsan-gce
2019/10/23 04:19 https://github.com/google/ktsan.git kcsan 05f2236801fe d0686497 .config console log report ci2-upstream-kcsan-gce
* Struck through repros no longer work on HEAD.