WARNING in timer_wait

WARNING in timer_wait_running
Status: upstream: reported C repro on 2020/08/31 17:07
Reported-by: syzbot+3b14b2ed9b3d06dcaa07@syzkaller.appspotmail.com
First crash: 234d, last: 22d

Cause bisection: introduced by (bisect log) :
commit b1012ca8dc4f9b1a1fe8e2cb1590dd6d43ea3849
Author: Lu Baolu <baolu.lu@linux.intel.com>
Date: Thu Jul 23 01:34:37 2020 +0000

iommu/vt-d: Skip TE disabling on quirky gfx dedicated iommu

Crash: WARNING in timer_wait_running (log)
Repro: C syz .config

Patch testing requests:
Created	Duration	User	Patch	Repo	Result
2020/09/13 20:55	16m	anmol.karan123@gmail.com	patch	upstream	OK

Sample crash report:

------------[ cut here ]------------
WARNING: CPU: 0 PID: 26914 at kernel/time/posix-timers.c:849 timer_wait_running+0x218/0x250 kernel/time/posix-timers.c:849
Modules linked in:
CPU: 1 PID: 26914 Comm: syz-executor195 Not tainted 5.12.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:timer_wait_running+0x218/0x250 kernel/time/posix-timers.c:849
Code: 00 48 c7 c2 20 c2 6d 89 be 91 02 00 00 48 c7 c7 80 c2 6d 89 c6 05 a5 fc 4a 0c 01 e8 e1 72 5c 07 e9 b1 fe ff ff e8 a8 36 0e 00 <0f> 0b e9 08 ff ff ff e8 dc e0 51 00 e9 3b fe ff ff 4c 89 e7 e8 df
RSP: 0018:ffffc900019afd58 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff8880255154c0 RSI: ffffffff8165baa8 RDI: ffffffff896dced8
RBP: ffff88802795cbc0 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff8179e0a8 R11: 000000000000002b R12: ffffc900019afdb8
R13: 0000000000000000 R14: ffffffff896dce60 R15: ffffc900019afdb8
FS:  00007fe5d4d0d700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004b3705 CR3: 000000002d166000 CR4: 0000000000350ee0
Call Trace:
 do_timer_settime.part.0+0x119/0x1d0 kernel/time/posix-timers.c:929
 do_timer_settime kernel/time/posix-timers.c:938 [inline]
 __do_sys_timer_settime kernel/time/posix-timers.c:952 [inline]
 __se_sys_timer_settime kernel/time/posix-timers.c:938 [inline]
 __x64_sys_timer_settime+0x219/0x310 kernel/time/posix-timers.c:938
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x450cf9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 21 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe5d4d0d208 EFLAGS: 00000246 ORIG_RAX: 00000000000000df
RAX: ffffffffffffffda RBX: 00000000004d5298 RCX: 0000000000450cf9
RDX: 000000002006b000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000004d5290 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004d529c
R13: 00007ffeb8845c7f R14: 00007fe5d4d0d300 R15: 0000000000022000

Fix bisection attempts:
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro
ci-upstream-kasan-gce-smack-root	2021/03/01 21:44	upstream	7a7fd0de	d5a3ae1f	.config	log	report	syz	C
ci-upstream-kasan-gce-smack-root	2021/01/20 14:43	upstream	45dfb8a5	d5a3ae1f	.config	log	report	syz	C
ci-upstream-kasan-gce-smack-root	2020/12/03 02:49	upstream	34816d20	d5a3ae1f	.config	log	report	syz	C
ci-upstream-kasan-gce-smack-root	2020/11/03 02:17	upstream	b7cbaf59	d5a3ae1f	.config	log	report	syz	C

Crashes (11):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Title
ci-upstream-kasan-gce-root	2021/03/30 08:37	upstream	1e43c377	6a81331a	.config	log	report	syz	C		WARNING in timer_wait_running
ci-upstream-kasan-gce-smack-root	2020/08/31 11:51	upstream	dcc5c6f0	d5a3ae1f	.config	log	report	syz	C
ci-upstream-kasan-gce	2020/08/31 09:04	upstream	dcc5c6f0	d5a3ae1f	.config	log	report	syz	C
ci-upstream-kasan-gce-386	2020/08/30 07:16	upstream	1127b219	d5a3ae1f	.config	log	report	syz	C
ci-upstream-kasan-gce-selinux-root	2020/08/31 16:15	upstream	dcc5c6f0	d5a3ae1f	.config	log	report	syz
ci-upstream-linux-next-kasan-gce-root	2020/09/01 06:09	linux-next	b36c9697	d5a3ae1f	.config	log	report	syz
ci-upstream-kasan-gce	2020/09/10 13:54	upstream	34d4ddd3	409809d8	.config	log	report
ci-upstream-kasan-gce-386	2020/12/21 14:09	upstream	e37b12e4	04201c06	.config	log	report			info
ci-upstream-kasan-gce-386	2020/10/03 19:43	upstream	d3d45f82	2653fa43	.config	log	report			info
ci-upstream-kasan-gce-386	2020/08/30 05:14	upstream	1127b219	d5a3ae1f	.config	log	report
ci-upstream-linux-next-kasan-gce-root	2020/09/17 20:20	linux-next	860461e4	8247808b	.config	log	report			info