Re: [syzbot] [net?] INFO: rcu detected stall in sock_write_iter (3)

Hillf Danton
2024-05-07T12:35:21Z

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);
--