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SubjectLinux 4.13: Reported regressions as of Monday, 2017-08-14
Hi! Find below my third regression report for Linux 4.13. It lists 11
regressions I'm currently aware of (or 10 if you count the two scsi-mq
regressions discussions as one). 4 regressions are new; 3 got fixed
since last weeks report (two others didn't even make it to the report,
as they were quickly fixed); 1 gets removed. You can also find the
report at where I try to update it every now
and then.

As always: Are you aware of any other regressions? Then please let me
know. For details see 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!

P.P.S.: Sorry, I adjusted the report structure again because I added a
new field that shows the date when a proper kernel developer (normally:
one that is working in the affected subsystem) looked into issue. That
should hopefully make it easier to spot regressions that are getting
ignored or got stuck somehow.

== 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 report against linux-next in May already
Reported: 2017-07-10 Developer activity: none

Null dereference in rt5677_i2c_probe()
Status: Patch is available in in asoc-next as commit ddc9e69b9dc2
Reported: 2017-07-17 Developer activity: 2017-07-27
Linux-Regression-ID: lr#96bd63

[Dell xps13 9630] Could not be woken up from suspend-to-idle via usb
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
Linux-Regression-ID: lr#bd29ab

[lkp-robot] [Btrfs] 28785f70ef:
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
Linux-Regression-ID: lr#a7d273

SCSI-MQ performance regression due to blk-mq scheduler
Status: Revert planned
Note: see also "Switching to MQ by default may generate some bug reports"
Reported: 2017-07-31 Developer activity: 2017-08-13

Switching to MQ by default may generate some bug reports
Status: Revert planned
Note: see also "SCSI-MQ performance regression due to blk-mq scheduler"
Reported: 2017-08-03 Developer activity: 2017-08-13

CIFS mount error -112 due to "SMB3 by default for security reasons"
Status: Reminded people they need to get the issue to the mailing list
Note: Due to the changes in 908b852df1d5d27d289e915fea7bfc16d38b8a76
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
Reported: 2017-08-06 Developer activity: none
Linux-Regression-ID: lr#60efe5

clang build regression in ext4
Status: report contains patch to fix issue
Reported: 2017-08-07 Developer activity: 2017-08-12

ACPI/IORT: fix build regression without IOMMU
Status: report contains patch to fix issue
Reported: 2017-08-10 Developer activity: 2017-08-10

Build regression: cc1: error: '-march=r3000' requires '-mfp32'
Status: brand new
Reported: 2017-08-13 Developer activity: none

Lockdep: possible recursive locking detected
Status: tglx posted a patch to fix issue
Reported: 2017-08-14 Developer activity: 2017-08-14

== Waiting for clarification from reporter ==

SGI UV300/UV300: kernel BUG at arch/x86/mm/init_64.c:350! during boot
Status: not 100% sure if this is a regression
Note: related to ?
Reported: 2017-08-02 Developer activity: none

== Removed ==

[I945GM] Pasted text not shown after mouse middle-click
Status: Turns out it's an older problem that even shows up with 3.16
Reported: 2017-07-17 Developer activity: none
Linux-Regression-ID: lr#d672f3

== Fixed since last weeks report ==

NULL pointer deref in networking
Status: Fixed in rc4 (presumably thx to aae4e7a8bc)
Linux-Regression-ID: lr#084be9

Xen HVM guest with KASLR enabled wouldn't boot any longer
Status: part of

bio-integrity: Fix regression if profile verify_fn is NULL
Status: Fixed as part of
Linux-Regression-ID: lr#35498d

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