New subject: mainline/master bisection: baseline.login on peach-pi

3 Apr 2020

Please see the bisection report below about a boot failure.
Reports aren't automatically sent to the public while we're
trialing new bisection features on kernelci.org but this one
looks valid.
This bisection was run with exynos_defconfig but the issue can
also be reproduced with multi_v7_defconfig.  It doesn't appear to
be affecting any other platforms on kernelci.org.  This looks
like a DRM driver problem, the kernel image boots fine without
the modules installed.  It actually started failing on Tuesday in
mainline.
Guillaume
On 02/04/2020 19:38, kernelci.org bot wrote:
...


This automated bisection report was sent to you on the basis  *
that you may be involved with the breaking commit it has      *
found.  No manual investigation has been done to verify it,   *
and the root cause of the problem may be somewhere else.      *
                                                          *


If you do send a fix, please include this trailer:            *
Reported-by: "kernelci.org bot" bot@kernelci.org          *
                                                          *


Hope this helps!                                              *


mainline/master bisection: baseline.login on peach-pi
Summary:
  Start:      56a451b780676 Merge tag 'ntb-5.7' of git://github.com/jonmason/ntb
  Plain log:  https://storage.kernelci.org//mainline/master/v5.6-3277-g56a451b78067/arm/ex...
  HTML log:   https://storage.kernelci.org//mainline/master/v5.6-3277-g56a451b78067/arm/ex...
  Result:     42e67b479eab6 drm/prime: use dma length macro when mapping sg
Checks:
  revert:     PASS
  verify:     PASS
Parameters:
  Tree:       mainline
  URL:        https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
  Branch:     master
  Target:     peach-pi
  CPU arch:   arm
  Lab:        lab-collabora
  Compiler:   gcc-8
  Config:     exynos_defconfig
  Test case:  baseline.login
Breaking commit found:

commit 42e67b479eab6d26459b80b4867298232b0435e7
Author: Shane Francis bigbeeshane@gmail.com
Date:   Wed Mar 25 09:07:39 2020 +0000
drm/prime: use dma length macro when mapping sg

As dma_map_sg can reorganize scatter-gather lists in a
way that can cause some later segments to be empty we should
always use the sg_dma_len macro to fetch the actual length.

This could now be 0 and not need to be mapped to a page or
address array

Fixes: be62dbf554c5 ("iommu/amd: Convert AMD iommu driver to the dma-iommu api")
Bug: https://bugzilla.kernel.org/show_bug.cgi?id=206461
Bug: https://bugzilla.kernel.org/show_bug.cgi?id=206895
Bug: https://gitlab.freedesktop.org/drm/amd/issues/1056
Signed-off-by: Shane Francis <bigbeeshane@gmail.com>
Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200325090741.21957-2-bigbeeshane@gmail.com
Cc: stable@vger.kernel.org

diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
index 86d9b0e45c8c6..1de2cde2277ca 100644
--- a/drivers/gpu/drm/drm_prime.c
+++ b/drivers/gpu/drm/drm_prime.c
@@ -967,7 +967,7 @@ int drm_prime_sg_to_page_addr_arrays(struct sg_table *sgt, struct page **pages,
index = 0;
   for_each_sg(sgt->sgl, sg, sgt->nents, count) {

len = sg->length;




len = sg_dma_len(sg);

page = sg_page(sg);
addr = sg_dma_address(sg);


Git bisection log:

git bisect start
# good: [8b614cb8f1dcac8ca77cf4dd85f46ef3055f8238] Merge tag '5.6-rc4-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6
git bisect good 8b614cb8f1dcac8ca77cf4dd85f46ef3055f8238
# bad: [56a451b780676bc1cdac011735fe2869fa2e9abf] Merge tag 'ntb-5.7' of git://github.com/jonmason/ntb
git bisect bad 56a451b780676bc1cdac011735fe2869fa2e9abf
# bad: [59838093be51ee9447f6ad05483d697b6fa0368d] Merge tag 'driver-core-5.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core
git bisect bad 59838093be51ee9447f6ad05483d697b6fa0368d
# bad: [32db9f10d52c97ffc407c7dad81c6fafcad730b2] Merge tag 'arm-soc-fixes-5.6' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
git bisect bad 32db9f10d52c97ffc407c7dad81c6fafcad730b2
# good: [78511edc2dd4c7b9f74f3b544093c854b7bd7744] Merge tag 'pm-5.6-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
git bisect good 78511edc2dd4c7b9f74f3b544093c854b7bd7744
# good: [76ccd234269bd05debdbc12c96eafe62dd9a6180] Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect good 76ccd234269bd05debdbc12c96eafe62dd9a6180
# good: [81573b18f26defe672a7d960f9af9ac2c97f324d] selftests/net/forwarding: add Makefile to install tests
git bisect good 81573b18f26defe672a7d960f9af9ac2c97f324d
# good: [9efcc4a129363187c9bf15338692f107c5c9b6f0] afs: Fix unpinned address list during probing
git bisect good 9efcc4a129363187c9bf15338692f107c5c9b6f0
# bad: [823846c3107197b6eae9fb656a23e986926d6c07] Merge tag 'riscv-for-linus-5.6' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux
git bisect bad 823846c3107197b6eae9fb656a23e986926d6c07
# bad: [7bf8df68cba0536479aead32297e47908922582c] Merge tag 'drm-fixes-2020-03-27' of git://anongit.freedesktop.org/drm/drm
git bisect bad 7bf8df68cba0536479aead32297e47908922582c
# good: [fbf66796a0aedbaea248c7ade1459ccd0dd4cb44] Input: move the new KEY_SELECTIVE_SCREENSHOT keycode
git bisect good fbf66796a0aedbaea248c7ade1459ccd0dd4cb44
# bad: [5117c363eb213d5503f5b7e39c9bfafd46388184] Merge tag 'drm-misc-fixes-2020-03-26' of git://anongit.freedesktop.org/drm/drm-misc into drm-fixes
git bisect bad 5117c363eb213d5503f5b7e39c9bfafd46388184
# bad: [0199172f933342d8b1011aae2054a695c25726f4] drm/amdgpu: fix scatter-gather mapping with user pages
git bisect bad 0199172f933342d8b1011aae2054a695c25726f4
# bad: [42e67b479eab6d26459b80b4867298232b0435e7] drm/prime: use dma length macro when mapping sg
git bisect bad 42e67b479eab6d26459b80b4867298232b0435e7
# first bad commit: [42e67b479eab6d26459b80b4867298232b0435e7] drm/prime: use dma length macro when mapping sg

    

Re: mainline/master bisection: baseline.login on peach-pi

# first bad commit: [42e67b479eab6d26459b80b4867298232b0435e7] drm/prime: use dma length macro when mapping sg