rostedt@xxxxxxxxxxx sed in <20230714100019.6bf9b1ab@xxxxxxxxxxxxxxxxxx> >> On Fri, 14 Jul 2023 14:34:04 +0900 >> <kkabe@xxxxxxxxxxx> wrote: >> >> > >> > So I'm confused about why it's mentioned. Was it backported? >> > >> >> > >> Taketo Kabe, could you please help to clean this confusion up? Did you >> > >> mean 5.19 in https://bugzilla.kernel.org/show_bug.cgi?id=217669#c5 ? And >> > >> BTW: did you really use a vanilla kernel for your bisection? >> > >> > >> > Reporter Me: >> > I bisected using freedesktop.org kernel tree, which git commit ID is >> > in sync with kernel.org >> > but version number in ./Makefile could be slighty behind. >> > >> > Patch in >> > https://bugzilla.kernel.org/show_bug.cgi?id=217669#c4 >> > fixed the problem in freedesktop.org kernel 5.18.0-rc2 . >> > This may explain that in kernel.org tree, the said commit is in kernel-5.19. >> >> Even if the bisect did land on this commit, it doesn't make sense. I would >> think that one of the results of the bisect was incorrect (a pass that >> should have failed?), as that would lead the bisect down to the wrong >> conclusion. >> >> Now if you you remove this commit and everything works fine, and add it >> back again and it fails reliably, then I can't argue it is not the commit. I agree with that it does not make sense. But reverting that commit made the freedesktop.org kernel-5.18-0-rc2 not panic, and adding it back made kernel panic (actually, check for vblank->worker==NULL fires) >> >> But the commit in question kicks off a worker thread at boot up to search >> for weak functions that were tagged to be traced by the function tracer and >> sets them to "disabled" to never be traced. >> >> Is the function tracer used at all here? I really do not see how this >> commit affects the code that is crashing. Unless there's something wrong >> with the way the kworker was set up and it corrupted other kworkers :-/ >> -- Steve Yes, this is puzzling. That's why I need other people's opinion on this. Does it matter the DUT is a slow machine (Pentium 120MHz)? -- kabe
