KCSAN: data-race in cgroup_freezer_migrate_task / handle_mm

KCSAN: data-race in cgroup_freezer_migrate_task / handle_mm_fault
Status: auto-closed as invalid on 2020/02/23 07:27
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 646d, last: 646d

similar bugs (3):
Kernel	Title	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in cgroup_freezer_migrate_task / handle_mm_fault (4)	2	225d	249d	0/22	auto-closed as invalid on 2021/03/14 16:47
upstream	KCSAN: data-race in cgroup_freezer_migrate_task / handle_mm_fault (2)	1	357d	357d	0/22	auto-closed as invalid on 2020/11/02 09:03
upstream	KCSAN: data-race in cgroup_freezer_migrate_task / handle_mm_fault (3)	1	304d	287d	0/22	auto-closed as invalid on 2020/12/25 21:40

Sample crash report:

==================================================================
BUG: KCSAN: data-race in cgroup_freezer_migrate_task / handle_mm_fault

read to 0xffff88812194a558 of 1 bytes by task 12818 on cpu 0:
 cgroup_freezer_migrate_task+0x131/0x1d0 kernel/cgroup/freezer.c:239
 cgroup_migrate_execute+0x32f/0xa30 kernel/cgroup/cgroup.c:2431
 cgroup_update_dfl_csses+0x33c/0x350 kernel/cgroup/cgroup.c:2913
 cgroup_apply_control kernel/cgroup/cgroup.c:3153 [inline]
 cgroup_apply_control+0x47/0x60 kernel/cgroup/cgroup.c:3138
 cgroup_subtree_control_write+0x598/0x760 kernel/cgroup/cgroup.c:3302
 cgroup_file_write+0x119/0x320 kernel/cgroup/cgroup.c:3699
 kernfs_fop_write+0x1bd/0x300 fs/kernfs/file.c:315
 __vfs_write+0x67/0xc0 fs/read_write.c:494
 vfs_write fs/read_write.c:558 [inline]
 vfs_write+0x18a/0x390 fs/read_write.c:542
 ksys_write+0xd5/0x1b0 fs/read_write.c:611
 __do_sys_write fs/read_write.c:623 [inline]
 __se_sys_write fs/read_write.c:620 [inline]
 __x64_sys_write+0x4c/0x60 fs/read_write.c:620
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff88812194a558 of 1 bytes by task 12810 on cpu 1:
 mem_cgroup_enter_user_fault include/linux/memcontrol.h:553 [inline]
 handle_mm_fault+0x34d/0x530 mm/memory.c:4107
 do_user_addr_fault arch/x86/mm/fault.c:1441 [inline]
 __do_page_fault+0x456/0x8d0 arch/x86/mm/fault.c:1506
 do_page_fault+0x38/0x194 arch/x86/mm/fault.c:1530
 page_fault+0x34/0x40 arch/x86/entry/entry_64.S:1203

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 12810 Comm: syz-executor.4 Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (1):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Title
ci2-upstream-kcsan-gce	2019/12/15 07:18	https://github.com/google/ktsan.git kcsan	245a43005292	eef6e580	.config	log	report