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 > > Thanks, > Zorro
