[resend with proper subject, sorry for the noise]
[note to self: don't get distracted when writing the subject]
On 21.09.22 08:53, Thorsten Leemhuis wrote:
Hi Greg! As you likely heard already, 5.19.9 introduced a regression that breaks Thunderbolt and USB-C docks (and apparently Wifi in some cases as well) on quite a few (many?) modern systems. It's one of those problems where I think "hey, we ideally should fix this in stable as fast as possible" we briefly talked about last week on the LPC hallways. That made me wonder how to actually archive that in this particular case while keeping all involved parties happy and not skipping any CI testing queues considered important.
FWIW, here are a few few reports about the issue (I assume there are some for Arch Linux and openSUSE Tumbleweed as well, but didn't check).
https://lore.kernel.org/linux-iommu/485A6EA5-6D58-42EA-B298-8571E97422DE@get... https://bugzilla.kernel.org/show_bug.cgi?id=216497 https://bugzilla.redhat.com/show_bug.cgi?id=2128458 https://bugzilla.redhat.com/show_bug.cgi?id=2127753
A revert of the culprit (9cd4f1434479f ("iommu/vt-d: Fix possible recursive locking in intel_iommu_init()"); in 5.19.y it's 9516acba29e3) for mainline is here: https://lore.kernel.org/lkml/20220920081701.3453504-1-baolu.lu@linux.intel.c...
A few hours ago the revert was queued to get send to Joerg: https://lore.kernel.org/linux-iommu/20220921024054.3570256-1-baolu.lu@linux....
I fear it could easily take another week to get this fixed in stable depending on how fast the patch makes it to mainline and the timing of the next 5.19.y release and its -rc phase. That to me sounds like way too long for a problem like this that apparently plagues quite a few people.
That made me wonder: would you in cases like this be willing to start the -rc phase for a interim 5.19.y release with just that revert while it's still heading towards mainline? Then the CI systems that test stable -rcs could chew on things already; and the new stable release could go out right after the revert landed in mainline (unless the testing finds any problems, of course).
Ciao, Thorsten