Re: splice() rcu_sched self-detected stall on CPU

2020-07-20 Thread Paul E. McKenney
On Mon, Jul 20, 2020 at 04:12:04PM -0400, Qian Cai wrote: > On Tue, May 05, 2020 at 03:00:34PM -0400, Qian Cai wrote: > > > > > > > On May 5, 2020, at 2:57 PM, Paul E. McKenney wrote: > > > > > > On Mon, May 04, 2020 at 03:11:09PM -0400, Qian Cai wrote: > > >> Running a syscall fuzzer inside a

Re: splice() rcu_sched self-detected stall on CPU

2020-07-20 Thread Qian Cai
On Tue, May 05, 2020 at 03:00:34PM -0400, Qian Cai wrote: > > > > On May 5, 2020, at 2:57 PM, Paul E. McKenney wrote: > > > > On Mon, May 04, 2020 at 03:11:09PM -0400, Qian Cai wrote: > >> Running a syscall fuzzer inside a container on linux-next floods > >> systems with soft lockups. It looks

Re: splice() rcu_sched self-detected stall on CPU

2020-05-05 Thread Qian Cai
> On May 5, 2020, at 2:57 PM, Paul E. McKenney wrote: > > On Mon, May 04, 2020 at 03:11:09PM -0400, Qian Cai wrote: >> Running a syscall fuzzer inside a container on linux-next floods systems >> with soft lockups. It looks like stuck in this line at >> iov_iter_copy_from_user_atomic(), Thoug

Re: splice() rcu_sched self-detected stall on CPU

2020-05-05 Thread Paul E. McKenney
On Mon, May 04, 2020 at 03:11:09PM -0400, Qian Cai wrote: > Running a syscall fuzzer inside a container on linux-next floods systems with > soft lockups. It looks like stuck in this line at > iov_iter_copy_from_user_atomic(), Thoughts? > > iterate_all_kinds(i, bytes, v, > copyin(

splice() rcu_sched self-detected stall on CPU

2020-05-04 Thread Qian Cai
Running a syscall fuzzer inside a container on linux-next floods systems with soft lockups. It looks like stuck in this line at iov_iter_copy_from_user_atomic(), Thoughts? iterate_all_kinds(i, bytes, v, copyin((p += v.iov_len) - v.iov_len, v.iov_base, v.iov_len),