On Tue, May 31, 2022 at 02:39:08AM +0800, Zorro Lang wrote: > On Mon, May 30, 2022 at 04:06:16PM +0800, Zorro Lang wrote: > > Hi mm folks: > > > > I reported a regression bug on latest upstream linux: > > https://bugzilla.kernel.org/show_bug.cgi?id=216047 > > > > It's about xfs/ext4 + DAX, panic at mm/page_table_check.c:51! > > > > static struct page_table_check *get_page_table_check(struct page_ext *page_ext) > > { > > ==> BUG_ON(!page_ext); > > return (void *)(page_ext) + page_table_check_ops.offset; > > } > > > > It's 100% reproducible for me, by running fstests generic/623: > > https://git.kernel.org/pub/scm/fs/xfs/xfstests-dev.git/tree/tests/generic/623 > > on xfs or ext4 with DAX enabled. > > > > It doesn't look like a xfs or ext4 issue, so send to linux-mm to get more > > reviewing. More details please refer to above bug link. I changed its Pruduct > > to mm, but the Assignee isn't changed by default. > > It's not a regression *recently* at least, I still can reproduce this bug on > linux v5.16. > > But I found it's related with someone kernel configuration (sorry I haven't > figured out which one config is). I've upload two kernel config files, one[1] > can build a kernel which reproduce this bug, the other[2] can't. Hope that > helps. > > Thanks, > Zorro > > [1] > https://bugzilla.kernel.org/attachment.cgi?id=301076 > > [2] > https://bugzilla.kernel.org/attachment.cgi?id=301077 Rather than make anyone looking at this download multiple files and run diff, perhaps you could just post the output of 'diff -u config.good config.bad'? Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx
