linux-kernel - Re: Bisected GFP in bfq_bfqq

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Message-ID: <20190401122233.3e861312@fire.localdomain>
Date:   Mon, 1 Apr 2019 12:22:33 +0300
From:   Dmitrii Tcvetkov <demfloro@...floro.ru>
To:     Paolo Valente <paolo.valente@...aro.org>
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

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