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

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

(¹) previous reports can be found at

== Current regressions ==

Desc: Bad flicker on skylake HQD due to code in the 4.7 merge window
Repo: 2016-05-30
Stat: 2016-07-08
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
Stat: 2016-06-22
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
Stat: 2016-07-08
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
Stat: 2016-07-02
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
Stat: 2016-07-05
Note: waiting for feedback from reporter

Desc: kmemcheck: Caught 64-bit read from uninitialized memory; iptables/nf_register_net_hooks
Repo: 2016-06-19
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
Stat: 2016-06-22
Note: wonder if this is important enough to investigate further; related, similar bugs: 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
Stat: 2016-07-10
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
Stat: 2016-07-08
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
Stat: 2016-07-04
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
Stat: 2016-07-06
Note: reporter and developer agree: not a regression in 4.7

Desc: Rename file corruption due to VFS-Changes?
Repo: 2016-06-16
Stat: 2016-06-22
Note: issue likely fixed in mainline by 9f541801 + e7d6ef979; see also:

== Fixed since last report ==

Desc: BUG: unable to handle kernel NULL pointer dereference […] qla24xx_process_response_queue+0x49/0x4b0 [qla2xxx]
Repo: 2016-06-14
Stat: 2016-07-08
Note: Fixed

Desc: Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks
Repo: 2016-06-16
Stat: 2016-07-08
Note: Fixed

Desc: lk 4.7 regression: EDAC, amd64_edac: Drop pci_register_driver() use
Repo: 2016-06-15
Stat: 2016-07-08
Note: Fixed

Desc: sound disappeared, ACPI/PCI/IRQ related
Repo: 2016-06-20
Stat: 2016-07-07
Note: fixed

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