KCSAN: data-race in futex_wait_queue_me / prepare

KCSAN: data-race in futex_wait_queue_me / prepare_signal (2)
Status: moderation: reported on 2020/06/21 11:47
Reported-by: syzbot+730a2bbd66878efe4a5a@syzkaller.appspotmail.com
First crash: 220d, last: 9h32m

similar bugs (1):
Kernel	Title	Repro	Bisected	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in futex_wait_queue_me / prepare_signal			3	241d	252d	0/17	closed as invalid on 2019/11/19 13:54

Sample crash report:

==================================================================
BUG: KCSAN: data-race in futex_wait_queue_me / prepare_signal

write to 0xffff88812649d064 of 4 bytes by task 8624 on cpu 1:
 freezer_do_not_count include/linux/freezer.h:109 [inline]
 freezable_schedule include/linux/freezer.h:171 [inline]
 futex_wait_queue_me+0x186/0x250 kernel/futex.c:2634
 futex_wait+0x145/0x390 kernel/futex.c:2740
 do_futex+0x144a/0x21c0 kernel/futex.c:3811
 __do_sys_futex kernel/futex.c:3872 [inline]
 __se_sys_futex+0x26d/0x330 kernel/futex.c:3840
 __x64_sys_futex+0x74/0x80 kernel/futex.c:3840
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88812649d064 of 4 bytes by task 8622 on cpu 0:
 sig_task_ignored kernel/signal.c:94 [inline]
 sig_ignored kernel/signal.c:119 [inline]
 prepare_signal+0x88d/0xdb0 kernel/signal.c:961
 __send_signal+0x64/0x7d0 kernel/signal.c:1081
 send_signal+0x398/0x3e0 kernel/signal.c:1241
 do_send_sig_info+0x9b/0xe0 kernel/signal.c:1290
 do_send_specific+0xc7/0x100 kernel/signal.c:3784
 do_tkill kernel/signal.c:3810 [inline]
 __do_sys_tgkill kernel/signal.c:3829 [inline]
 __se_sys_tgkill kernel/signal.c:3823 [inline]
 __x64_sys_tgkill+0x108/0x140 kernel/signal.c:3823
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 8622 Comm: syz-fuzzer Not tainted 5.8.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (150):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Maintainers
ci2-upstream-kcsan-gce	2020/07/04 13:07	upstream	35e884f8	4f739670	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/07/04 01:05	upstream	0c7d7d1f	51095195	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/07/03 15:03	upstream	cdd3bb54	6e569755	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/07/03 01:19	upstream	7cc2a8ea	f30c14bf	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/07/02 10:21	upstream	cd77006e	f30c14bf	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/07/02 07:56	upstream	cd77006e	bed10395	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/07/02 06:02	upstream	cd77006e	bed10395	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/07/02 04:20	upstream	cd77006e	bed10395	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/07/02 02:08	upstream	edb543cf	bed10395	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/07/02 00:43	upstream	edb543cf	bed10395	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/07/01 23:20	upstream	edb543cf	bed10395	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/07/01 21:45	upstream	edb543cf	bed10395	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/07/01 20:41	upstream	edb543cf	695ef2dd	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/07/01 17:58	upstream	7c30b859	39acb39d	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/07/01 15:29	upstream	7c30b859	39acb39d	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/07/01 13:48	upstream	7c30b859	39acb39d	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/07/01 12:44	upstream	7c30b859	39acb39d	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/07/01 10:45	upstream	7c30b859	090d8f7b	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/07/01 08:07	upstream	7c30b859	c0383ebe	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/07/01 04:34	upstream	7c30b859	c0383ebe	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/07/01 02:20	upstream	7c30b859	c0383ebe	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/07/01 01:18	upstream	7c30b859	c0383ebe	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/06/30 20:34	upstream	7c30b859	c0383ebe	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/06/30 19:26	upstream	7c30b859	917afeaa	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/06/30 17:35	upstream	7c30b859	917afeaa	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/06/30 17:15	upstream	7c30b859	917afeaa	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/06/30 15:54	upstream	7c30b859	917afeaa	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/06/30 13:15	upstream	7c30b859	917afeaa	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/06/30 11:49	upstream	7c30b859	917afeaa	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/06/30 10:22	upstream	7c30b859	917afeaa	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/06/30 07:30	upstream	7c30b859	917afeaa	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/06/30 04:49	upstream	7c30b859	917afeaa	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/06/30 03:23	upstream	7c30b859	917afeaa	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/06/29 23:19	upstream	7c30b859	917afeaa	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/06/29 21:52	upstream	7c30b859	ce9ef6f2	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/06/29 17:45	upstream	7c30b859	ce9ef6f2	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/06/29 15:54	upstream	9ebcfadb	ce9ef6f2	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/06/29 13:08	upstream	9ebcfadb	df01f6fc	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/06/29 10:23	upstream	9ebcfadb	3ff434cc	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/06/29 05:38	upstream	9ebcfadb	a2cdad9d	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/06/29 03:24	upstream	9ebcfadb	a2cdad9d	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/06/29 00:28	upstream	91a9a90d	a2cdad9d	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/06/28 23:08	upstream	91a9a90d	a2cdad9d	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/06/28 22:07	upstream	91a9a90d	a2cdad9d	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/06/28 19:57	upstream	91a9a90d	a2cdad9d	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/06/28 14:30	upstream	719fdd32	a2cdad9d	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/06/28 11:16	upstream	719fdd32	a2cdad9d	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/06/20 10:25	upstream	672f9255	c655ec77	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2020/06/17 11:39	https://github.com/google/ktsan.git kcsan	7c3cd68e	b6c46f43	.config	log	report	dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci2-upstream-kcsan-gce	2019/11/27 00:29	https://github.com/google/ktsan.git kcsan	ef798c30	1048481f	.config	log	report	arnd@arndb.de, christian@brauner.io, deepa.kernel@gmail.com, ebiederm@xmission.com, guro@fb.com, linux-kernel@vger.kernel.org, oleg@redhat.com