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Subject: Re: bioset changes in 4.18 broke aha1542
To:     Ondrej Zary <linux@rainbow-software.org>,
        Kent Overstreet <kent.overstreet@gmail.com>
Cc:     linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org
References: <201810182034.51724.linux@rainbow-software.org>
From:   Jens Axboe <axboe@kernel.dk>
Message-ID: <ee572ca2-8bbe-cd7d-5c41-8bb2fb5b204d@kernel.dk>
Date:   Thu, 18 Oct 2018 12:58:57 -0600
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On 10/18/18 12:34 PM, Ondrej Zary wrote:
> Hello,
> aha1542 works fine in 4.17 but crashes in 4.18. It's hard to bisect because
> of many commits that don't compile.
> # only skipped commits left to test
> # possible first bad commit: [52190f8abe7f2bf2b4e5f9760cbcc1427ca2136b] fs: convert block_dev.c to bioset_init()
> # possible first bad commit: [a47a28b74a5c7c27bf621276b85ad6c124651236] target: convert to bioset_init()/mempool_init()
> # possible first bad commit: [6f1c819c219f7841079f0f43ab62727a55b0d849] dm: convert to bioset_init()/mempool_init()
> # possible first bad commit: [afeee514ce7f4cab605beedd03be71ebaf0c5fc8] md: convert to bioset_init()/mempool_init()
> # possible first bad commit: [d19936a26658a7a53edd5619d631ee2c2c3151a2] bcache: convert to bioset_init()/mempool_init()
> # possible first bad commit: [b906bbb6997785d9ea0bd3f5585537afa6257c43] lightnvm: convert to bioset_init()/mempool_init()
> 
> Testing manually, a47a28b74a5c7c27bf621276b85ad6c124651236 works.
> 52190f8abe7f2bf2b4e5f9760cbcc1427ca2136b does not compile
> 8ac9f7c1fd1d342e82ddf078425423b050652ba0 does not compile
> e292d7bc63c8f2adb3dfda27910e805f1b6557f9 does not compile
> dad08527525f9a8ac9c7f278864c65f94bc5e9b3 does not compile
> 943cf9f3ca16133dbd00f9a4cbfea46512fcb0e8 works
> ..
> fedc3abe7bd2dcc4c80bcf3cff8708a3908d8219 works
> 04c4950d5b373ba712d928592e05e73510785bca crashes

It looks like the ISA bioset pool isn't being initialized. You should
have messages like this in your dmesg:

isa pool size: 16 pages

(which you do), but also something on the bioset section. Do you have
this one:

pool size: 64 pages

as well?

-- 
Jens Axboe