On 12/9/24 10:07, Malte Schröder wrote: > [You don't often get email from malte.schroeder@xxxxxxxx. Learn why this is important at https://aka.ms/LearnAboutSenderIdentification ] > > On 09/12/2024 09:06, Bernd Schubert wrote: >> Hi Malte, >> >> On 12/9/24 07:42, Malte Schröder wrote: >>> On 09/12/2024 02:57, Jingbo Xu wrote: >>>> Hi, Malte >>>> >>>> On 12/9/24 6:32 AM, Malte Schröder wrote: >>>>> On 08/12/2024 21:02, Malte Schröder wrote: >>>>>> On 08/12/2024 02:23, Matthew Wilcox wrote: >>>>>>> On Sun, Dec 08, 2024 at 12:01:11AM +0100, Malte Schröder wrote: >>>>>>>> Reverting fb527fc1f36e252cd1f62a26be4906949e7708ff fixes the issue for >>>>>>>> me. >>>>>>> That's a merge commit ... does the problem reproduce if you run >>>>>>> d1dfb5f52ffc? And if it does, can you bisect the problem any further >>>>>>> back? I'd recommend also testing v6.12-rc1; if that's good, bisect >>>>>>> between those two. >>>>>>> >>>>>>> If the problem doesn't show up with d1dfb5f52ffc? then we have a dilly >>>>>>> of an interaction to debug ;-( >>>>>> I spent half a day compiling kernels, but bisect was non-conclusive. >>>>>> There are some steps where the failure mode changes slightly, so this is >>>>>> hard. It ended up at 445d9f05fa149556422f7fdd52dacf487cc8e7be which is >>>>>> the nfsd-6.13 merge ... >>>>>> >>>>>> d1dfb5f52ffc also shows the issue. I will try to narrow down from there. >>>>>> >>>>>> /Malte >>>>>> >>>>> Ha! This time I bisected from f03b296e8b51 to d1dfb5f52ffc. I ended up >>>>> with 3b97c3652d91 as the culprit. >>>> Would you mind checking if [1] fixes the issue? It is a fix for >>>> 3b97c3652d91, though the initial report shows 3b97c3652d91 will cause >>>> null-ptr-deref. >>>> >>>> >>>> [1] >>>> https://lore.kernel.org/all/20241203-fix-fuse_get_user_pages-v2-1-acce8a29d06b@xxxxxxx/ >>> It does not fix the issue, still behaves the same. >>> >> could you give instructions how to get the issue? Maybe we can script it and I let >> it run in a loop on one my systems? >> >> >> Thanks, >> Bernd > > Sure. To reproduce I set up a VM running Arch and bcachefs as rootfs > (Works out of the box on current Arch). Build -rc kernel using > pacman-pkg build target. Try to install FreeCAD, "flatpak install > flathub org.freecad.FreeCAD". Usually it fails to download some > dependencies. It's a pretty wonky test, but I didn't find a more > specific way to reproduce this. > What is the relation to fuse here? pacmang-pkg or 'flatpak' are using fuse internally? Thanks, Bernd
