linux-kernel - Re: [syzbot] [net?] INFO: rcu detected stall in sock_write

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Message-Id: <20240507123456.2204-1-hdanton@sina.com>
Date: Tue,  7 May 2024 20:34:56 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+2b5fbaaa4280010beda7@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [net?] INFO: rcu detected stall in sock_write_iter (3)

On Tue, 07 May 2024 05:14:17 -0700
> syzbot found the following issue on:
> 
> HEAD commit:    7367539ad4b0 Merge tag 'cxl-fixes-6.9-rc7' of git://git.ke..
> git tree:       upstream
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1379d9df180000

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git  7367539ad4b0

--- 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);
--