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Date:   Fri, 1 Jun 2018 18:35:57 -0400
From:   Kent Overstreet <kent.overstreet@gmail.com>
To:     Krzysztof Kozlowski <krzk@kernel.org>
Cc:     Jens Axboe <axboe@kernel.dk>, Mike Snitzer <snitzer@redhat.com>,
        Shaohua Li <shli@fb.com>, linux-kernel@vger.kernel.org,
        Alasdair Kergon <agk@redhat.com>, dm-devel@redhat.com,
        "linux-samsung-soc@vger.kernel.org" 
        <linux-samsung-soc@vger.kernel.org>
Subject: Re: [bisect BUG] dm-crypt percpu counter warnings and invalid kernel
 paging request at virtual address
Message-ID: <20180601223557.GA25942@kmo-pixel>
References: <CAJKOXPfSbsu0RGTUFfb+t_uOvQQxa0uDn-nsG+1uuKAq56nVXA@mail.gmail.com>
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On Fri, Jun 01, 2018 at 02:55:15PM +0200, Krzysztof Kozlowski wrote:
> Hi,
> 
> Todays linux-next 20180601 fails during dm-crypt tests on Exynos5422
> (ARMv7, Cortex-A7+A15) using crypto HW block from SoC (s5p-aes).
> 
> The test which fails:
> https://github.com/krzk/tools/blob/master/tests/s5p-sss-cryptsetup.sh
> 
> Effect:
> 
> [  149.867394] ------------[ cut here ]------------
> [  149.870631] WARNING: CPU: 5 PID: 492 at
> ../drivers/md/dm-crypt.c:2225 crypt_dtr+0x1c0/0x1c4 [dm_crypt]
> [  149.880078] Modules linked in: dm_crypt s5p_jpeg exynos_gsc s5p_mfc
> v4l2_mem2mem v4l2_common videobuf2_dma_contig videobuf2_memops
> videobuf2_v4l2 videobuf2_common videodev media
> [  149.895908] CPU: 5 PID: 492 Comm: cryptsetup Tainted: G        W
>      4.17.0-rc4-00159-gae4c15db96d2 #36
> [  149.905328] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree)
> [  149.911398] [<c011291c>] (unwind_backtrace) from [<c010ece8>]
> (show_stack+0x10/0x14)
> [  149.919111] [<c010ece8>] (show_stack) from [<c0a32190>]
> (dump_stack+0x98/0xc4)
> [  149.926307] [<c0a32190>] (dump_stack) from [<c0126fa0>] (__warn+0x10c/0x124)
> [  149.933310] [<c0126fa0>] (__warn) from [<c01270d0>]
> (warn_slowpath_null+0x40/0x48)
> [  149.940862] [<c01270d0>] (warn_slowpath_null) from [<bf28e15c>]
> (crypt_dtr+0x1c0/0x1c4 [dm_crypt])
> [  149.949803] [<bf28e15c>] (crypt_dtr [dm_crypt]) from [<c06f34b8>]
> (dm_table_destroy+0x5c/0xf8)
> [  149.958360] [<c06f34b8>] (dm_table_destroy) from [<c06f0cb0>]
> (__dm_destroy+0x158/0x1b4)
> [  149.966414] [<c06f0cb0>] (__dm_destroy) from [<c06f7988>]
> (dev_remove+0xd4/0x104)
> [  149.973861] [<c06f7988>] (dev_remove) from [<c06f80b4>]
> (ctl_ioctl+0x2e4/0x660)
> [  149.981144] [<c06f80b4>] (ctl_ioctl) from [<c029fcc0>]
> (do_vfs_ioctl+0xb0/0x9e8)
> [  149.988508] [<c029fcc0>] (do_vfs_ioctl) from [<c02a062c>]
> (ksys_ioctl+0x34/0x5c)
> [  149.995874] [<c02a062c>] (ksys_ioctl) from [<c0101000>]
> (ret_fast_syscall+0x0/0x28)
> [  150.061101] ---[ end trace 3e3bc2b7df1963aa ]---
> 
> [  150.065594] Unable to handle kernel paging request at virtual
> address 2e02f000
> [  150.383043] [<c0483edc>] (percpu_counter_add_batch) from
> [<bf28e378>] (crypt_page_free+0x34/0x3c [dm_crypt])
> [  150.392838] [<bf28e378>] (crypt_page_free [dm_crypt]) from
> [<c0229b18>] (mempool_exit+0x24/0x60)
> [  150.401584] [<c0229b18>] (mempool_exit) from [<bf28e028>]
> (crypt_dtr+0x8c/0x1c4 [dm_crypt])
> [  150.409903] [<bf28e028>] (crypt_dtr [dm_crypt]) from [<c06f34b8>]
> (dm_table_destroy+0x5c/0xf8)
> [  150.418477] [<c06f34b8>] (dm_table_destroy) from [<c06f0cb0>]
> (__dm_destroy+0x158/0x1b4)
> [  150.426533] [<c06f0cb0>] (__dm_destroy) from [<c06f7988>]
> (dev_remove+0xd4/0x104)
> [  150.433982] [<c06f7988>] (dev_remove) from [<c06f80b4>]
> (ctl_ioctl+0x2e4/0x660)
> [  150.441264] [<c06f80b4>] (ctl_ioctl) from [<c029fcc0>]
> (do_vfs_ioctl+0xb0/0x9e8)
> [  150.448628] [<c029fcc0>] (do_vfs_ioctl) from [<c02a062c>]
> (ksys_ioctl+0x34/0x5c)
> [  150.455994] [<c02a062c>] (ksys_ioctl) from [<c0101000>]
> (ret_fast_syscall+0x0/0x28)
> 
> ---
> 
> Full log is here:
> https://krzk.eu/#/builders/1/builds/2117/steps/18/logs/serial0
> 
> Bisect could not work reliably because a lot of commits from Kent
> Overstreet just do not compile. Really, non-buildable stuff should not
> be committed...

Sorry, I do compile test stuff but sometimes I screw up...

I'll work on getting a test set up.

> Anyway bisect points around convert to bioset_init()/mempool_init().
> 
> Bisect log:
> git bisect start
> # good: [ecb37ce9baac653cc09e2b631393dde3df82979f] bcache: Move couple
> of functions to sysfs.c
> git bisect good ecb37ce9baac653cc09e2b631393dde3df82979f
> # bad: [ae4c15db96d22776fe188b5271a226f81e85e872] dm: add writecache target
> git bisect bad ae4c15db96d22776fe188b5271a226f81e85e872
> # good: [b7405176b58aa475354f3c0d2ca1c560e9354288] Merge branch
> 'nvme-4.18-2' of git://git.infradead.org/nvme into for-4.18/block
> git bisect good b7405176b58aa475354f3c0d2ca1c560e9354288
> # skip: [b906bbb6997785d9ea0bd3f5585537afa6257c43] lightnvm: convert
> to bioset_init()/mempool_init()
> git bisect skip b906bbb6997785d9ea0bd3f5585537afa6257c43
> # skip: [0892fac8719f062f98116ee883230a004a9fce1e] drbd: convert to
> bioset_init()/mempool_init()
> git bisect skip 0892fac8719f062f98116ee883230a004a9fce1e
> # bad: [04c4950d5b373ba712d928592e05e73510785bca] block: fixup
> bioset_integrity_create() call
> git bisect bad 04c4950d5b373ba712d928592e05e73510785bca
> # skip: [64c4bc4de79fec06bb46d9827e7c4df67a025590] pktcdvd: convert to
> bioset_init()/mempool_init()
> git bisect skip 64c4bc4de79fec06bb46d9827e7c4df67a025590
> # skip: [8ac9f7c1fd1d342e82ddf078425423b050652ba0] btrfs: convert to
> bioset_init()/mempool_init()
> git bisect skip 8ac9f7c1fd1d342e82ddf078425423b050652ba0
> # skip: [d19936a26658a7a53edd5619d631ee2c2c3151a2] bcache: convert to
> bioset_init()/mempool_init()
> git bisect skip d19936a26658a7a53edd5619d631ee2c2c3151a2
> # skip: [52190f8abe7f2bf2b4e5f9760cbcc1427ca2136b] fs: convert
> block_dev.c to bioset_init()
> git bisect skip 52190f8abe7f2bf2b4e5f9760cbcc1427ca2136b
> # skip: [338aa96d5661048b3c0cafc6d91876025603cacf] block: convert
> bounce, q->bio_split to bioset_init()/mempool_init()
> git bisect skip 338aa96d5661048b3c0cafc6d91876025603cacf
> # good: [2ab74cd29622c48e9852d85618081c061b6ac6d9] blk-throttle: fix
> potential NULL pointer dereference in throtl_select_dispatch
> git bisect good 2ab74cd29622c48e9852d85618081c061b6ac6d9
> # good: [0b6bad7d669ef2abd3b9e1f8cee1fbd448abbc5c] blk-throttle:
> return proper bool type to caller instead of 0/1
> git bisect good 0b6bad7d669ef2abd3b9e1f8cee1fbd448abbc5c
> # skip: [6f1c819c219f7841079f0f43ab62727a55b0d849] dm: convert to
> bioset_init()/mempool_init()
> git bisect skip 6f1c819c219f7841079f0f43ab62727a55b0d849
> # skip: [a47a28b74a5c7c27bf621276b85ad6c124651236] target: convert to
> bioset_init()/mempool_init()
> git bisect skip a47a28b74a5c7c27bf621276b85ad6c124651236
> # skip: [afeee514ce7f4cab605beedd03be71ebaf0c5fc8] md: convert to
> bioset_init()/mempool_init()
> git bisect skip afeee514ce7f4cab605beedd03be71ebaf0c5fc8
> # skip: [e292d7bc63c8f2adb3dfda27910e805f1b6557f9] xfs: convert to
> bioset_init()/mempool_init()
> git bisect skip e292d7bc63c8f2adb3dfda27910e805f1b6557f9
> # skip: [dad08527525f9a8ac9c7f278864c65f94bc5e9b3] block: Drop bioset_create()
> git bisect skip dad08527525f9a8ac9c7f278864c65f94bc5e9b3
> # only skipped commits left to test
> # possible first bad commit:
> [04c4950d5b373ba712d928592e05e73510785bca] block: fixup
> bioset_integrity_create() call
> # possible first bad commit:
> [dad08527525f9a8ac9c7f278864c65f94bc5e9b3] block: Drop bioset_create()
> # possible first bad commit:
> [e292d7bc63c8f2adb3dfda27910e805f1b6557f9] xfs: convert to
> bioset_init()/mempool_init()
> # possible first bad commit:
> [8ac9f7c1fd1d342e82ddf078425423b050652ba0] btrfs: convert to
> bioset_init()/mempool_init()
> # 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()
> # possible first bad commit:
> [64c4bc4de79fec06bb46d9827e7c4df67a025590] pktcdvd: convert to
> bioset_init()/mempool_init()
> # possible first bad commit:
> [0892fac8719f062f98116ee883230a004a9fce1e] drbd: convert to
> bioset_init()/mempool_init()
> # possible first bad commit:
> [338aa96d5661048b3c0cafc6d91876025603cacf] block: convert bounce,
> q->bio_split to bioset_init()/mempool_init()
> 
> Best regards,
> Krzysztof