Linux 4.7: Reported regressions as of Sunday, 2016-07-10

[Thorsten Leemhuis]

Hi! Here is my fifth regression report for Linux 4.7. It lists 10
regressions I'm currently aware of; 2 of them are new; 1 of those 
seems to be a a side effect of a fix for another regression.

The report also mentions 3 regression that I removed from the list, as
it looks like those issues are no regressions.

Find also details on 4 regressions that were fixed since the last
report(Â)

As usual: Please let me know about any regression missing on the list  
or if it contains something which shouldn't be there.

HTH, CU, Thorsten

(Â) previous reports can be found at
http://thread.gmane.org/gmane.linux.kernel/2241805
http://thread.gmane.org/gmane.linux.kernel/2247804
http://thread.gmane.org/gmane.linux.kernel/2253623
http://thread.gmane.org/gmane.linux.kernel/2258287

== Current regressions ==

Desc: Bad flicker on skylake HQD due to code in the 4.7 merge window
Repo: 2016-05-30 http://thread.gmane.org/gmane.linux.kernel/2230377
Stat: 2016-07-08 http://thread.gmane.org/gmane.linux.kernel/2230377/focus=94140
Note: vswing issue, maybe primary a Firmware problem; a few patches improved situation, but did not fix the problem

Desc: 795ae7a0de: pixz.throughput -9.1% regression
Repo: 2016-06-02 http://thread.gmane.org/gmane.linux.kernel/2233056/
Stat: 2016-06-22 http://thread.gmane.org/gmane.linux.kernel/2233056/focus=2251134
Note: hannes still can't reproduce; stalled until reporter posts results from more tests

Desc: System hang when plug/un-plug USB 3.1 key via thunderbolt port on Dell XPS 13
Repo: 2016-06-14 https://bugzilla.kernel.org/show_bug.cgi?id=120241
Stat: 2016-07-08 https://bugzilla.kernel.org/show_bug.cgi?id=120241#c7
Note: there was wip, but root cause hard to track down; responsible developer now afk till early August

Desc: regression in 8250 uart driver
Repo: 2016-06-14 http://thread.gmane.org/gmane.linux.kernel/2243130/focus=2243653
Stat: 2016-07-02 http://thread.gmane.org/gmane.linux.kernel/2243130/focus=2258232
Note: andy has it still on his todo list, but something else has a higher priority

Desc: Multi-thread udp 4.7 regression, bisected to 71d8c47fc653; performance decreased or complete failure with a test
Repo: 2016-06-27 http://thread.gmane.org/gmane.linux.network/418861/focus=418908
Stat: 2016-07-05 http://thread.gmane.org/gmane.linux.network/418861/focus=63936
Note: waiting for feedback from reporter

Desc: kmemcheck: Caught 64-bit read from uninitialized memory; iptables/nf_register_net_hooks
Repo: 2016-06-19 https://bugzilla.kernel.org/show_bug.cgi?id=120651
Stat: 2016-07-02 
Note: afaics stalled, after I told reporter a week ago how to contact the relevant developers

Desc: UBSAN splat in drivers/acpi/acpica/dsutils.c:641:16
Repo: 2016-06-15 https://bugzilla.kernel.org/show_bug.cgi?id=120351
Stat: 2016-06-22 https://bugzilla.kernel.org/show_bug.cgi?id=120411#c3
Note: wonder if this is important enough to investigate further; related, similar bugs: https://bugzilla.kernel.org/show_bug.cgi?id=120411 https://bugzilla.kernel.org/show_bug.cgi?id=120391 https://bugzilla.kernel.org/show_bug.cgi?id=120371 https://bugzilla.kernel.org/show_bug.cgi?id=120361 Not sure which of them are regressions

Desc: Kernel does not boot with 7ed18e2d1b6782989eb399ef79a8cc1a1b583b3c ( acpi-4.7-rc7 aka All of these fix recent regressions in ACPICA, in the ACPI PCI IRQ management code and in the ACPI AML debugger.)
Repo: 2016-07-08 https://bugzilla.kernel.org/show_bug.cgi?id=121701
Stat: 2016-07-10 http://thread.gmane.org/gmane.linux.kernel.pci/53279/focus=85652
Note: pointed Rafael to bugzilla on LKML

Desc: ACPI EC problems/ ACPI / EC: Fix an order issue in ec_remove_handlers()
Repo: 2016-07-06 http://thread.gmane.org/gmane.linux.kernel/2260279/
Stat: 2016-07-08 http://thread.gmane.org/gmane.linux.kernel/2260279/focus=85583
Note: patch under discussion


== Going to me removed from the list ==

Desc: RadeonSI get a huge performance dip with used with the nine state tracker
Repo: 2016-06-04 https://bugzilla.kernel.org/show_bug.cgi?id=119631
Stat: 2016-07-04 https://bugzilla.kernel.org/show_bug.cgi?id=119631#c14
Note: not a regression according to one of the AMD graphic driver developers; otoh it looks like one to me; yes, the real bug is in the gallium nine, wine side, but afaics it only showed up after a kernel change introduced a new feature

Desc: performance drop on SFC interface around 30 %
Repo: 2016-06-17 https://bugzilla.kernel.org/show_bug.cgi?id=120461
Stat: 2016-07-06 https://bugzilla.kernel.org/show_bug.cgi?id=120461#c20
Note: reporter and developer agree: not a regression in 4.7

Desc: Rename file corruption due to VFS-Changes?
Repo: 2016-06-16 http://thread.gmane.org/gmane.linux.kernel/2245402/
Stat: 2016-06-22 http://thread.gmane.org/gmane.linux.kernel/2245402/focus=2250254
Note: issue likely fixed in mainline by 9f541801 + e7d6ef979; see also: http://thread.gmane.org/gmane.linux.kernel/2231928/focus=76124


== Fixed since last report ==

Desc: BUG: unable to handle kernel NULL pointer dereference [â] qla24xx_process_response_queue+0x49/0x4b0 [qla2xxx]
Repo: 2016-06-14 https://bugzilla.kernel.org/show_bug.cgi?id=120201
Stat: 2016-07-08 https://git.kernel.org/torvalds/c/262e2bfd7d1e1f1ee48b870e5dfabb87c06b975e
Note: Fixed

Desc: Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks
Repo: 2016-06-16 https://bugzilla.kernel.org/show_bug.cgi?id=120481
Stat: 2016-07-08 https://git.kernel.org/torvalds/c/7dd4912594daf769a46744848b05bd5bc6d62469 https://git.kernel.org/torvalds/c/ea1dc6fc6242f991656e35e2ed3d90ec1cd13418
Note: Fixed

Desc: lk 4.7 regression: EDAC, amd64_edac: Drop pci_register_driver() use
Repo: 2016-06-15 http://thread.gmane.org/gmane.linux.kernel/2245115/
Stat: 2016-07-08 https://git.kernel.org/torvalds/c/1ead852dd88779eda12cb09cc894a03d9abfe1ec
Note: Fixed

Desc: sound disappeared, ACPI/PCI/IRQ related
Repo: 2016-06-20 http://thread.gmane.org/gmane.linux.kernel/2247930/ http://thread.gmane.org/gmane.linux.acpi.devel/85281/focus=20097
Stat: 2016-07-07 https://git.kernel.org/linus/7ed18e2d1b6782989eb399ef79a8cc1a1b583b3c
Note: fixed