Re: [lkp] [net] 1fbe4b46cac: WARNING: CPU: 0 PID: 2245 at kernel/sched/core.c:7376 __might_sleep+0x8b/0xa8()

Oleg Nesterov
2015-08-04T16:33:31Z

On 08/03, Oleg Nesterov wrote:
>
> Now that I can actually see the code, I think that we should simply remove
> __set_current_state(TASK_RUNNING) and set_current_state(TASK_INTERRUPTIBLE).
> But let me re-check this once again tomorrow, I simply can't understand why
> pktgen_thread_worker() does this.
>
> Unless I am totally confused they could be removed right after ef87979c273a2
> "pktgen: better scheduler friendliness" which in particular changed the main
> loop to use wait_event(). Then later baac167b "pktgen: avoid expensive
> set_current_state() call in loop" changed the 1st __set_current_state() to
> set RUNNING, and moved the 2nd set_current_state(TASK_INTERRUPTIBLE) outside
> the main loop for absolutely no reason.

Yes, I am sending the patch. Both set_current_state()'s look obviously unneeded,
and afaics we could hit the same warning even without 1fbe4b46caca. At least
pktgen_rem_thread()->remove_proc_entry() can sleep.

Oleg.