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SubjectLinux 4.13: Reported regressions as of Monday, 2017-08-28
Date
Hi! Find below my fourth regression report for Linux 4.13. It lists 6
regressions I'm currently aware of. 1 of them is new, 5 got fixed since
the last report (that was two weeks ago; didn't find time for compiling
one last week; sorry). You can also find the report at
http://bit.ly/lnxregrep413 where I try to update it every now and then.
That didn't work to well in the past few weeks; but I'll try to update
it at then end oft the week as the 4.13 release gets closer.

As always: Are you aware of any other regressions? Then please let me
know. For details see http://bit.ly/lnxregtrackid And please tell me if
there is anything in the report that shouldn't be there.

Ciao, Thorsten

P.S.: Thx to all those that CCed me on regression reports or provided
other input, it makes compiling these reports a whole lot easier!

== Current regressions ==

[x86/mm/gup] e585513b76: will-it-scale.per_thread_ops -6.9% regression
Status: Asked on the list, but looks like issue gets ignored by everyone
Note: I'm a bit unsure if adding this issue to this list was a good
idea. Side note: Was reported against linux-next in May already
Reported: 2017-07-10 Developer activity: none known
http://lkml.kernel.org/r/20170710024020.GA26389@yexl-desktop
Cause: https://git.kernel.org/torvalds/c/e585513b76f7

[Dell xps13 9630] Could not be woken up from suspend-to-idle via usb
keyboard
Status: it's a tracking bug for an issue that seems to get handled by
Intel devs already
Note: suspend-to-idle is rare
Reported: 2017-07-24 Developer activity: 2017-07-24
https://bugzilla.kernel.org/show_bug.cgi?id=196459
Cause: https://git.kernel.org/torvalds/c/33e4f80ee69b
Linux-Regression-ID: lr#bd29ab

[lkp-robot] [Btrfs] 28785f70ef: xfstests.generic.273.fail
Status: Jeff: "We're not ignoring it. […] collection of bugs that
approximate a correct result, and we're addressing them individually.[…]"
Reported: 2017-07-26 Developer activity: 2017-08-10
https://lkml.kernel.org/r/20170726062352.GC4877@yexl-desktop
https://lkml.kernel.org/r/bcd49705-e63a-4439-1620-57cd16f5bc09@suse.com
Cause: https://git.kernel.org/torvalds/c/28785f70ef88
Linux-Regression-ID: lr#a7d273

CIFS mount error -112 due to "SMB3 by default for security reasons"
Status: Issue was raised on the mailing list, but ignore
Note: That's a security change, but one that IMHO at least could have
been handled a lot better by giving users a hint what's wrong (and not
"mount: […] Host is down"). I'm considering to submit a revert as RFC to
get a discussion going.
Reported: 2017-08-06 Developer activity: none known
https://bugzilla.kernel.org/show_bug.cgi?id=196599
https://www.spinics.net/lists/linux-cifs/msg12992.html
Cause: https://git.kernel.org/torvalds/c/eef914a9eb5e &
https://git.kernel.org/torvalds/c/908b852df1d5
Linux-Regression-ID: lr#60efe5

Build regression: cc1: error: '-march=r3000' requires '-mfp32'
Note: is there any way to query if this is still happening in 0-day?
Reported: 2017-08-13 Developer activity: none known
https://lkml.kernel.org/r/59901cdb.B0NdvWhnqacJCnUm%fengguang.wu@intel.com
Cause: https://git.kernel.org/torvalds/c/89a55278dee4

regression when ATI chipsets detected
Status: Fix proposed
Reported: 2017-08-23 Developer activity: 2017-08-24
https://lkml.kernel.org/r/1503485760-15146-1-git-send-email-Sandeep.Singh@amd.com
https://lkml.kernel.org/r/1503548835-27057-1-git-send-email-Sandeep.Singh@amd.com
Cause: https://git.kernel.org/torvalds/c/e788787ef4f9


== Going to get removed ==

SGI UV300/UV300: kernel BUG at arch/x86/mm/init_64.c:350! during boot
Status: not 100% sure if this is a regression; reported didn't provide
feedback
Note: related to https://bugzilla.kernel.org/show_bug.cgi?id=196565 ?
Reported: 2017-08-02 Developer activity: none known
https://bugzilla.kernel.org/show_bug.cgi?id=196561

ACPI/IORT: build regression without IOMMU
Note: Adding this was a mistake, as the causing commit was in linux-next
and not yet in mainline. Sorry for the noise.
Reported: 2017-08-10 Developer activity: none known
https://lkml.kernel.org/r/20170810121114.2509560-1-arnd@arndb.de


== Fixed since last report ==

Null dereference in rt5677_i2c_probe()
Status: Fixed in https://git.kernel.org/torvalds/c/9ce76511b67b
Reported: 2017-07-17 Developer activity: none known
https://bugzilla.kernel.org/show_bug.cgi?id=196397
Cause: https://git.kernel.org/torvalds/c/a36afb0ab648
Linux-Regression-ID: lr#96bd63

SCSI-MQ performance regression due to blk-mq scheduler
Status: Fixed in https://git.kernel.org/torvalds/c/cbe7dfa26eee
Reported: 2017-07-31 Developer activity: none known
https://lkml.kernel.org/r/20170731165111.11536-2-ming.lei@redhat.com
https://lkml.kernel.org/r/20170813174422.16197-1-hch@lst.de
Cause: https://git.kernel.org/torvalds/c/5c279bd9e406

Switching to MQ by default may generate some bug reports
Status: Fixed in https://git.kernel.org/torvalds/c/cbe7dfa26eee
Reported: 2017-08-03 Developer activity: none known
https://lkml.kernel.org/r/20170803085115.r2jfz2lofy5spfdb@techsingularity.net
https://lkml.kernel.org/r/20170813174422.16197-1-hch@lst.de
Cause: https://git.kernel.org/torvalds/c/5c279bd9e406

clang build regression in ext4
Status: Fixed by https://git.kernel.org/torvalds/c/b80b32b6d5e7
Reported: 2017-08-07 Developer activity: none known
https://lkml.kernel.org/r/20170807105701.3835991-1-arnd@arndb.de
Cause: https://git.kernel.org/torvalds/c/2df2c3402fc8

Lockdep: possible recursive locking detected
Status: https://git.kernel.org/torvalds/c/84393817db09
Reported: 2017-08-14 Developer activity: none known
https://lkml.kernel.org/r/0e25aebb-b501-b92b-3931-1646b009e8ef@lwfinger.net
https://lkml.kernel.org/r/alpine.DEB.2.20.1708140920250.1865@nanos
Cause: https://git.kernel.org/torvalds/c/fc8dffd379ca

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