linux-kernel - sched: panic() in schedule

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Date:   Fri, 7 Dec 2018 18:00:20 +0800
From:   Kathleen Chang <yt.chang@...iatek.com>
To:     <mingo@...hat.com>
CC:     <wsd_upstream@...iatek.com>
Subject: sched: panic() in schedule_bug

hi, 

[kernel-4.9, kernel-4.14] 

When preemption disable in schedule(), 
Current linux design will panic when panic_on_warn=1 

However, 
   default setting, panic_on_warn=0,  and 
   if panic_on_warn=1  , and call panic() after printing out WARN()
location.  It affects too much cases.  

Could panic directly without checking panic_on_warn? 
This is obviously incorrect behavior, and should be panic to prevent
misbehavior.  

        if (panic_on_warn)
                panic("scheduling while atomic\n");

thanks!  

=============================
kernel/sched/core.c

schedule_debug =>  when in atomic preempt off   => __schedule_bug 

====