Re: WARN ON at kernel/sched/deadline.c task_non_contending

2019-03-22 Thread luca abeni
Hi Juri, On Fri, 22 Mar 2019 15:32:32 +0100 Juri Lelli wrote: [...] > > diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c > > index 6a73e41a2016..43901fa3f269 100644 > > --- a/kernel/sched/deadline.c > > +++ b/kernel/sched/deadline.c > > @@ -252,7 +252,6 @@ static void

Re: WARN ON at kernel/sched/deadline.c task_non_contending

2019-03-22 Thread Juri Lelli
Hi, On 13/03/19 15:49, luca abeni wrote: > Hi, > > (I added Juri in cc) > > On Tue, 12 Mar 2019 10:03:12 +0800 > "chengjian (D)" wrote: > [...] > > diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c > > index 31c050a0d0ce..d73cb033a06d 100644 > > --- a/kernel/sched/deadline.c > >

Re: WARN ON at kernel/sched/deadline.c task_non_contending

2019-03-15 Thread luca abeni
Hi, On Fri, 15 Mar 2019 08:43:00 +0800 "chengjian (D)" wrote: [...] > > diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c > > index 6a73e41a2016..43901fa3f269 100644 > > --- a/kernel/sched/deadline.c > > +++ b/kernel/sched/deadline.c > > @@ -252,7 +252,6 @@ static void

Re: WARN ON at kernel/sched/deadline.c task_non_contending

2019-03-14 Thread chengjian (D)
On 2019/3/13 22:49, luca abeni wrote: Hi, After looking at the patch a little bit more and running some tests, I suspect this solution might be racy: when the timer is already active, (and hrtimer_start() fails), it relies on its handler to decrease the running bw (by setting

Re: WARN ON at kernel/sched/deadline.c task_non_contending

2019-03-13 Thread luca abeni
Hi, (I added Juri in cc) On Tue, 12 Mar 2019 10:03:12 +0800 "chengjian (D)" wrote: [...] > diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c > index 31c050a0d0ce..d73cb033a06d 100644 > --- a/kernel/sched/deadline.c > +++ b/kernel/sched/deadline.c > @@ -252,7 +252,6 @@ static void

Re: WARN ON at kernel/sched/deadline.c task_non_contending

2019-03-12 Thread luca abeni
Hi all, On Tue, 12 Mar 2019 10:03:12 +0800 "chengjian (D)" wrote: > Hi. > > When looking to test SCHED_DEADLINE syzkaller report an warn in > task_non_contending(). I tested the mainline kernel with the C program > and captured the same call trace. [...] > diff --git a/kernel/sched/deadline.c

WARN ON at kernel/sched/deadline.c task_non_contending

2019-03-11 Thread chengjian (D)
Hi. When looking to test SCHED_DEADLINE syzkaller report an warn in task_non_contending(). I tested the mainline kernel with the C program and captured the same call trace. [The previous message contains some strings in other formats, making the mail less readable. So I resend it. SORRY.] [