linux-kernel - Re: Bisected GFP in bfq_bfqq

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Message-Id: <EBC090F1-72C0-4794-91CC-37F9A2A1DEFB@linaro.org>
Date:   Mon, 1 Apr 2019 12:35:11 +0200
From:   Paolo Valente <paolo.valente@...aro.org>
To:     Dmitrii Tcvetkov <demfloro@...floro.ru>
Cc:     Jens Axboe <axboe@...nel.dk>,
        linux-block <linux-block@...r.kernel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: Bisected GFP in bfq_bfqq_expire on v5.1-rc1



> Il giorno 1 apr 2019, alle ore 11:22, Dmitrii Tcvetkov <demfloro@...floro.ru> ha scritto:
> 
> On Mon, 1 Apr 2019 11:01:27 +0200
> Paolo Valente <paolo.valente@...aro.org> wrote:
>> Ok, thank you. Could you please do a
>> 
>> list *(bfq_bfqq_expire+0x1f3)
>> 
>> for me?
>> 
>> Thanks,
>> Paolo
>> 
>>> 
>>> <gpf.txt><gpf-w-bfq-group-iosched.txt><config.txt>
> 
> Reading symbols from vmlinux...done.
> (gdb) list *(bfq_bfqq_expire+0x1f3)
> 0xffffffff813d02c3 is in bfq_bfqq_expire (block/bfq-iosched.c:3390).
> 3385             * even in case bfqq and thus parent entities go on receiving 
> 3386             * service with the same budget.
> 3387             */
> 3388            entity = entity->parent;
> 3389            for_each_entity(entity)
> 3390                    entity->service = 0;
> 3391    }
> 3392
> 3393    /*
> 3394     * Budget timeout is not implemented through a dedicated timer, but

Thank you very much.  Unfortunately this doesn't ring any bell.  I'm
trying to reproduce the failure.  It will probably take a little
time.  If I don't make it, I'll ask you to kindly retry after applying
some instrumentation patch.

Thanks,
Paolo