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: 30d, last: 11d

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: 18211 at kernel/time/posix-timers.c:849 timer_wait_running+0x1a5/0x1d0 kernel/time/posix-timers.c:849
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 18211 Comm: syz-executor585 Not tainted 5.9.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1d6/0x29e lib/dump_stack.c:118
 panic+0x2c0/0x800 kernel/panic.c:231
 __warn+0x227/0x250 kernel/panic.c:600
 report_bug+0x1b1/0x2e0 lib/bug.c:198
 handle_bug+0x42/0x80 arch/x86/kernel/traps.c:234
 exc_invalid_op+0x16/0x40 arch/x86/kernel/traps.c:254
 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:536
RIP: 0010:timer_wait_running+0x1a5/0x1d0 kernel/time/posix-timers.c:849
Code: 51 49 fb ff 48 c7 c7 10 e5 4f 89 e8 b5 fb ff ff 44 89 f7 4c 89 fe 5b 41 5c 41 5d 41 5e 41 5f 5d e9 d0 95 ff ff e8 fb a9 0d 00 <0f> 0b e9 6f ff ff ff 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c 98 fe ff
RSP: 0018:ffffc9000bbc7e40 EFLAGS: 00010293
RAX: ffffffff81675225 RBX: 0000000000000000 RCX: ffff88808585e240
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: 0000000000000001 R08: ffffffff817abd90 R09: ffffed1012a6497d
R10: ffffed1012a6497d R11: 0000000000000000 R12: ffff888095324bc0
R13: dffffc0000000000 R14: 0000000000000000 R15: ffffc9000bbc7e80
 do_timer_settime+0x1e9/0x280 kernel/time/posix-timers.c:929
 __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+0x106/0x170 kernel/time/posix-timers.c:938
 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4468f9
Code: e8 5c b3 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 0f 83 8b 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fa011c82db8 EFLAGS: 00000246 ORIG_RAX: 00000000000000df
RAX: ffffffffffffffda RBX: 00000000006dbc38 RCX: 00000000004468f9
RDX: 0000000020000300 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000006dbc30 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc3c
R13: 00007ffdc2487abf R14: 00007fa011c839c0 R15: 20c49ba5e353f7cf
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (8):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Maintainers
ci-upstream-kasan-gce-smack-root	2020/08/31 11:51	upstream	dcc5c6f0	d5a3ae1f	.config	log	report	syz	C		linux-kernel@vger.kernel.org, tglx@linutronix.de
ci-upstream-kasan-gce	2020/08/31 09:04	upstream	dcc5c6f0	d5a3ae1f	.config	log	report	syz	C		linux-kernel@vger.kernel.org, tglx@linutronix.de
ci-upstream-kasan-gce-386	2020/08/30 07:16	upstream	1127b219	d5a3ae1f	.config	log	report	syz	C		linux-kernel@vger.kernel.org, tglx@linutronix.de
ci-upstream-kasan-gce-selinux-root	2020/08/31 16:15	upstream	dcc5c6f0	d5a3ae1f	.config	log	report	syz			linux-kernel@vger.kernel.org, tglx@linutronix.de
ci-upstream-linux-next-kasan-gce-root	2020/09/01 06:09	linux-next	b36c9697	d5a3ae1f	.config	log	report	syz			linux-kernel@vger.kernel.org, tglx@linutronix.de
ci-upstream-kasan-gce	2020/09/10 13:54	upstream	34d4ddd3	409809d8	.config	log	report				linux-kernel@vger.kernel.org, tglx@linutronix.de
ci-upstream-kasan-gce-386	2020/08/30 05:14	upstream	1127b219	d5a3ae1f	.config	log	report				linux-kernel@vger.kernel.org, tglx@linutronix.de
ci-upstream-linux-next-kasan-gce-root	2020/09/17 20:20	linux-next	860461e4	8247808b	.config	log	report			info	linux-kernel@vger.kernel.org, tglx@linutronix.de