KASAN: use-after-free Read in hrtimer_debug

KASAN: use-after-free Read in hrtimer_debug_hint

Status: upstream: reported C repro on 2022/12/22 20:58
Reported-by: syzbot+d32bc4d4962367055a56@syzkaller.appspotmail.com
First crash: 729d, last: 729d

Fix bisection: failed (error log, bisect log)

Sample crash report:

==================================================================
BUG: KASAN: use-after-free in hrtimer_debug_hint+0x2f/0x40 kernel/time/hrtimer.c:345
Read of size 8 at addr ffff8880a2e83278 by task ksoftirqd/1/18

CPU: 1 PID: 18 Comm: ksoftirqd/1 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2022/12/22 20:58	linux-4.19.y	3f8a27f9e27b	9da18ae8	.config	console log	report	syz	C		[disk image] [vmlinux]	ci2-linux-4-19	KASAN: use-after-free Read in hrtimer_debug_hint

* ~~Struck through~~ repros no longer work on HEAD.