linux-kernel - Re: bug in tag handling in blk-mq?

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Message-ID: <1525768632.5208.4.camel@gmx.de>
Date:   Tue, 08 May 2018 10:37:12 +0200
From:   Mike Galbraith <efault@....de>
To:     Paolo Valente <paolo.valente@...aro.org>,
        Jens Axboe <axboe@...nel.dk>
Cc:     Christoph Hellwig <hch@....de>,
        linux-block <linux-block@...r.kernel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Oleksandr Natalenko <oleksandr@...alenko.name>
Subject: Re: bug in tag handling in blk-mq?

On Tue, 2018-05-08 at 06:51 +0200, Mike Galbraith wrote:
> 
> I'm deadlined ATM, but will get to it.

(Bah, even a zombie can type ccache -C; make -j8 and stare...)

kbuild again hung on the first go (yay), and post hang data written to
sdd1 survived (kernel source lives in sdb3).  Full ftrace buffer (echo
1 > events/block/enable) available off list if desired.  dmesg.txt.xz
is dmesg from post hang crashdump, attached because it contains the
tail of trace buffer, so _might_ be useful.

homer:~ # df|grep sd
/dev/sdb3      959074776 785342824 172741072  82% /
/dev/sdc3      959074776 455464912 502618984  48% /backup
/dev/sdb1         159564      7980    151584   6% /boot/efi
/dev/sdd1      961301832 393334868 519112540  44% /abuild

Kernel is virgin modulo these...

patches/remove_irritating_plus.diff
patches/add-scm-version-to-EXTRAVERSION.patch
patches/block-bfq:-postpone-rq-preparation-to-insert-or-merge.patch
patches/block-bfq:-test.patch  (hang provocation hack from Paolo)

	-Mike
Download attachment "block_debug.tar.xz" of type "application/x-xz-compressed-tar" (2292 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (17300 bytes)

Download attachment "dmesg.txt.xz" of type "application/x-xz" (15824 bytes)