On Mon, Sep 02, 2024 at 04:21:09PM +0200, Christian Brauner wrote: > On Mon, Sep 02, 2024 at 03:00:37PM GMT, Matthew Wilcox wrote: > > On Mon, Sep 02, 2024 at 02:49:32PM +0200, Pankaj Raghav (Samsung) wrote: > > > From: Pankaj Raghav <p.raghav@xxxxxxxxxxx> > > > > > > Sven reported that a commit from bs > ps series was breaking the ksm ltp > > > test[1]. > > > > > > split_huge_page() takes precisely a page that is locked, and it also > > > expects the folio that contains that page to be locked after that > > > huge page has been split. The changes introduced converted the page to > > > folio, and passed the head page to be split, which might not be locked, > > > resulting in a kernel panic. > > > > > > This commit fixes it by always passing the correct page to be split from > > > split_huge_page() with the appropriate minimum order for splitting. > > > > This should be folded into the patch that is broken, not be a separate > > fix commit, otherwise it introduces a bisection hazard which are to be > > avoided when possible. > > Patch folded into "mm: split a folio in minimum folio order chunks" > with the Link to this patch. Please double-check. Thanks a lot! I still don't see it upstream[1]. Maybe it is yet to be pushed? [1] https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git/commit/?h=vfs.blocksize&id=fd031210c9ceb399db1dea001c6a5e98f3b4e2e7
