WARNING in task_participate_group

WARNING in task_participate_group_stop (2)
Status: upstream: reported C repro on 2018/04/29 17:00
Reported-by: syzbot+b109633ea805cac54a61@syzkaller.appspotmail.com
First crash: 1044d, last: 23d

Cause bisection: the issue happens on the oldest tested release (bisect log)
Crash: WARNING in corrupted (log)
Repro: C syz .config

Fix bisection: fixed by (bisect log) [merge commit]:
commit c32beba325d8c54d8affa158a0a54643ba87eab4
Author: Olof Johansson <olof@lixom.net>
Date: Thu May 16 06:23:43 2019 +0000

Merge tag 'mvebu-arm-5.2-1' of git://git.infradead.org/linux-mvebu into arm/late

similar bugs (8):
Kernel	Title	Repro	Fix bisect	Count	Last	Reported	Patched	Status
linux-4.14	WARNING in task_participate_group_stop	C	inconclusive	4	53d	461d	0/1	upstream: reported C repro on 2019/12/02 14:36
android-414	WARNING in task_participate_group_stop	C		2	732d	695d	0/1	public: reported C repro on 2019/04/12 00:01
android-44	WARNING in task_participate_group_stop (2)	C		4	732d	694d	0/2	public: reported C repro on 2019/04/13 00:00
android-49	WARNING in task_participate_group_stop	C		15	1152d	1309d	2/3	fixed on 2018/02/06 12:55
upstream	WARNING in task_participate_group_stop	C		29	1209d	1224d	4/21	fixed on 2018/02/02 04:39
linux-4.19	WARNING in task_participate_group_stop	C	error	3	43d	461d	0/1	upstream: reported C repro on 2019/12/02 13:46
android-44	WARNING in task_participate_group_stop	C		10	1161d	1168d	2/2	fixed on 2018/02/06 10:09
android-49	WARNING in task_participate_group_stop (2)	C		11	461d	693d	0/3	public: reported C repro on 2019/04/14 00:00

Sample crash report:

------------[ cut here ]------------
WARNING: CPU: 1 PID: 9870 at kernel/signal.c:378 task_participate_group_stop+0x296/0x300 kernel/signal.c:378
Modules linked in:
CPU: 1 PID: 9870 Comm: 4 Not tainted 5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:task_participate_group_stop+0x296/0x300 kernel/signal.c:378
Code: 7c 04 84 d2 75 72 41 89 9c 24 ac 00 00 00 41 bc 01 00 00 00 e9 07 ff ff ff e8 d6 9c 2c 00 0f 0b e9 fa fd ff ff e8 ca 9c 2c 00 <0f> 0b e9 ab fe ff ff 48 89 ef e8 0b 76 6f 00 e9 75 fe ff ff e8 b1
RSP: 0018:ffffc9000ad97c68 EFLAGS: 00010093
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88802b7a9bc0 RSI: ffffffff814637d6 RDI: 0000000000000003
RBP: ffff888017041aa8 R08: 0000000000000000 R09: 0000000000000003
R10: ffffffff81463670 R11: 0000000000000000 R12: ffff888017041a00
R13: ffff88802b7aa0c0 R14: 0000000000040000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000ffec8f6b CR3: 0000000035519000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 do_signal_stop+0x1f1/0x840 kernel/signal.c:2373
 get_signal+0xc26/0x20f0 kernel/signal.c:2631
 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:811
 handle_signal_work kernel/entry/common.c:147 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
 exit_to_user_mode_prepare+0x148/0x250 kernel/entry/common.c:201
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0023:0xb7000000
Code: Unable to access opcode bytes at RIP 0xb6ffffd6.
RSP: 002b:00000000ffec8ea0 EFLAGS: 00000200 ORIG_RAX: 000000000000000b
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Crashes (16):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	Title
ci-upstream-kasan-gce	2021/02/12 01:55	upstream	291009f6	a5f86b15	.config	log	report	syz	C	WARNING in task_participate_group_stop
ci-upstream-kasan-gce	2019/03/06 18:53	upstream	3717f613	05cf83bf	.config	log	report	syz	C
ci-upstream-kasan-gce-root	2019/03/06 18:52	upstream	3717f613	05cf83bf	.config	log	report	syz	C
ci-upstream-kasan-gce-root	2018/04/29 02:26	upstream	bf8f5de1	d5a5d045	.config	log	report	syz	C
ci-upstream-kasan-gce	2018/04/28 22:08	upstream	a97d8efd	d5a5d045	.config	log	report	syz	C
ci-upstream-kasan-gce	2020/03/29 01:46	upstream	906c4043	05736b29	.config	log	report	syz
ci-upstream-kasan-gce-root	2019/12/03 10:35	upstream	596cf45c	ab342da3	.config	log	report	syz
ci-upstream-kasan-gce	2019/12/02 14:55	upstream	ceb30747	f879db37	.config	log	report	syz
ci-upstream-kasan-gce-selinux-root	2019/03/06 19:46	upstream	3717f613	05cf83bf	.config	log	report	syz
ci-upstream-kasan-gce-smack-root	2019/03/06 18:47	upstream	3717f613	05cf83bf	.config	log	report	syz
ci-upstream-kasan-gce-386	2019/12/02 15:34	upstream	ceb30747	f879db37	.config	log	report	syz
ci-upstream-kasan-gce-386	2019/03/06 18:46	upstream	3717f613	05cf83bf	.config	log	report	syz
ci-upstream-kasan-gce-386	2018/05/02 13:48	upstream	f2125992	d5b114b4	.config	log	report	syz
ci-upstream-linux-next-kasan-gce-root	2020/04/21 08:59	linux-next	ac935d22	98a9f9e6	.config	log	report	syz
ci-upstream-kasan-gce	2020/01/30 16:06	upstream	39bed42d	5ed23f9a	.config	log	report
ci-upstream-kasan-gce-selinux-root	2018/10/07 07:37	upstream	c1d84a1b	8b311eaf	.config	log	report