linux-kernel - Re: [RFC 61/60] cosched: Accumulated fixes and improvements

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Message-ID: <13d56369-bdcc-9633-ecc0-659efadcd2a4@amazon.de>
Date:   Mon, 1 Oct 2018 11:13:46 +0200
From:   "Jan H. Schönherr" <jschoenh@...zon.de>
To:     Nishanth Aravamudan <naravamudan@...italocean.com>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC 61/60] cosched: Accumulated fixes and improvements

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