linux-kernel - Re: [syzbot] [kasan?] [mm?] INFO: rcu detected stall in __run_timer

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Date: Sun, 14 Apr 2024 10:53:36 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+1acbadd9f48eeeacda29@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [kasan?] [mm?] INFO: rcu detected stall in __run_timer_base

On Sat, 13 Apr 2024 19:04:34 -0700
> syzbot found the following issue on:
> 
> HEAD commit:    fe46a7dd189e Merge tag 'sound-6.9-rc1' of git://git.kernel..
> git tree:       upstream
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=111600cb180000

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git  fe46a7dd189e

--- x/net/sched/sch_taprio.c
+++ y/net/sched/sch_taprio.c
@@ -980,7 +980,9 @@ first_run:
 	rcu_assign_pointer(q->current_entry, next);
 	spin_unlock(&q->current_entry_lock);
 
-	hrtimer_set_expires(&q->advance_timer, end_time);
+	hrtimer_set_expires(&q->advance_timer,
+				ktime_add(timer->base->get_time(),
+					  ns_to_ktime(NSEC_PER_USEC *200)));
 
 	rcu_read_lock();
 	__netif_schedule(sch);
--