linux-kernel - [BUG] Serial/dma stall/failure after "dmaengine: fsl-edma: extract common fsl-edma code (no changes in behavior intended)"

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Date:   Wed, 4 Jul 2018 10:54:30 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Vinod Koul <vkoul@...nel.org>, dmaengine@...r.kernel.org,
        Angelo Dureghello <angelo@...am.it>
Cc:     Dan Williams <dan.j.williams@...el.com>,
        linux-kernel@...r.kernel.org, Stefan Agner <stefan@...er.ch>
Subject: [BUG] Serial/dma stall/failure after "dmaengine: fsl-edma: extract
 common fsl-edma code (no changes in behavior intended)"

Hi,

The commit 6ad069123f03bebe4315dea13d44845854ca6043 ("dmaengine:
fsl-edma: extract common fsl-edma code (no changes in behavior
intended)"), even though marked as no changes in behavior intended...
make serial console with DMA broken after boot. The console just hangs
- is not responsive even to SysRq. Usually after finishing boot -
before or after login prompt. Sometimes login is allowed and then it
hangs during printing dmesg.

Board: Toradex Colibri VF50 (NXP VF500, Cortex A5, serial configured
with DMA) on Iris Carrier.

Commit found with bisect:
git bisect start
# bad: [bce40927669338cc4a361fc97d46bf650573ce5c] Add linux-next
specific files for 20180704
git bisect bad bce40927669338cc4a361fc97d46bf650573ce5c
# good: [410da1e12ffed61129d61df5b7adce4d08c7f17c] net/smc: fix up
merge error with poll changes
git bisect good 410da1e12ffed61129d61df5b7adce4d08c7f17c
# good: [decd57900d6fd743f7ddc1329400f4bd9cf54284] Merge
remote-tracking branch 'crypto/master'
git bisect good decd57900d6fd743f7ddc1329400f4bd9cf54284
# good: [e9484bb660753ca8a35d219db000fff967b70a2c] Merge
remote-tracking branch 'tip/auto-latest'
git bisect good e9484bb660753ca8a35d219db000fff967b70a2c
# bad: [20adee487b5f252d3f38197d43487c004273d3d0] Merge
remote-tracking branch 'slave-dma/next'
git bisect bad 20adee487b5f252d3f38197d43487c004273d3d0
# good: [2df2577dce1d5fd98cac342fe857677a0556421b] Merge
remote-tracking branch 'tty/tty-next'
git bisect good 2df2577dce1d5fd98cac342fe857677a0556421b
# good: [03b17ed8410a61f4f337c7bcfded1f744182edd5] spi: spi-fsl-dspi:
Fix imprecise abort on VF500 during probe
git bisect good 03b17ed8410a61f4f337c7bcfded1f744182edd5
# good: [85e1d42663a0c163002961d2685be952067b0dc2] staging:
mt7621-eth: Fix memory leak in mtk_add_mac() error path
git bisect good 85e1d42663a0c163002961d2685be952067b0dc2
# good: [b244f917acb7e1f492c40f6f4cf7be860a5065a5] staging: rtl8188eu:
remove blank lines
git bisect good b244f917acb7e1f492c40f6f4cf7be860a5065a5
# good: [b244f917acb7e1f492c40f6f4cf7be860a5065a5] staging: rtl8188eu:
remove blank lines
git bisect good b244f917acb7e1f492c40f6f4cf7be860a5065a5
# good: [b244f917acb7e1f492c40f6f4cf7be860a5065a5] staging: rtl8188eu:
remove blank lines
git bisect good b244f917acb7e1f492c40f6f4cf7be860a5065a5
# good: [6c796f514b7f8d0fef4733b971a5ded9e9a74490] Merge
remote-tracking branch 'staging/staging-next'
git bisect good 6c796f514b7f8d0fef4733b971a5ded9e9a74490
# good: [14dfa379ffd3ffd73729a72c289e9db6780a60ab] Merge branch
'topic/ste' into next
git bisect good 14dfa379ffd3ffd73729a72c289e9db6780a60ab
# good: [c1199875d327a9b3bbb3fb1cca0d467d3e625fbb] dmaengine:
imx-sdma: Use GFP_NOWAIT for dma allocations
git bisect good c1199875d327a9b3bbb3fb1cca0d467d3e625fbb
# bad: [15efb0b488596a929bc00ce23aeb746ee6a7c14d] dmaengine: fsl-edma:
fix trailing whitespace
git bisect bad 15efb0b488596a929bc00ce23aeb746ee6a7c14d
# bad: [5c1355ad87a2c138049bfafa753b44046492aebc] dmaengine: fsl-edma:
add ColdFire mcf5441x edma support
git bisect bad 5c1355ad87a2c138049bfafa753b44046492aebc
# bad: [6ad069123f03bebe4315dea13d44845854ca6043] dmaengine: fsl-edma:
extract common fsl-edma code (no changes in behavior intended)
git bisect bad 6ad069123f03bebe4315dea13d44845854ca6043
# first bad commit: [6ad069123f03bebe4315dea13d44845854ca6043]
dmaengine: fsl-edma: extract common fsl-edma code (no changes in
behavior intended)

Defconfig and boot log attached. I could not find any obvious error in boot log.

Let me know if you need more data.

Best regards,
Krzysztof

Download attachment "vf_defconfig" of type "application/octet-stream" (6644 bytes)

View attachment "boot.log" of type "text/x-log" (10047 bytes)