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Subject: Re: [RFC 61/60] cosched: Accumulated fixes and improvements
To:     Nishanth Aravamudan <naravamudan@digitalocean.com>
Cc:     Ingo Molnar <mingo@redhat.com>,
        Peter Zijlstra <peterz@infradead.org>,
        linux-kernel@vger.kernel.org
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 <20180913191938.30526-1-jschoenh@amazon.de> <20180926172519.GA23535@breakout>
 <20180926210551.GA28790@breakout>
From:   "=?UTF-8?Q?Jan_H._Sch=c3=b6nherr?=" <jschoenh@amazon.de>
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Date:   Mon, 1 Oct 2018 11:13:46 +0200
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On 09/26/2018 11:05 PM, Nishanth Aravamudan wrote:
> On 26.09.2018 [10:25:19 -0700], Nishanth Aravamudan wrote:
>>
>> I found another issue today, while attempting to test (with 61/60
>> applied) separate coscheduling cgroups for vcpus and emulator threads
>> [the default configuration with libvirt].
> 
> <snip>
> 
> [  764.132461] BUG: unable to handle kernel NULL pointer dereference at 0000000000000040
> [  764.141001] PGD 0 P4D 0 
> [  764.144020] Oops: 0000 [#1] SMP PTI
> [  764.147988] CPU: 70 PID: 0 Comm: swapper/70 Tainted: G           OE     4.19-0rc3.ag-generic #4+1536951040do~8680a1b
> [  764.159086] Hardware name: Dell Inc. PowerEdge R640/0W23H8, BIOS 1.2.11 10/19/2017
> [  764.166968] RIP: 0010:set_next_entity+0x15/0x1d0

I got it reproduced.

I will send a fix, when I have one.

Regards
Jan