Ever since the conversion of DAX to the Xarray a RocksDB benchmark has been encountering intermittent lockups. The backtraces always include the filesystem-DAX PMD path, multi-order entries have been a source of bugs in the past, and disabling the PMD path allows a test that fails in minutes to run for an hour.
The regression has been bisected to "dax: Convert page fault handlers to XArray", but little progress has been made on the root cause debug. Unless / until root cause can be identified mark CONFIG_FS_DAX_PMD broken to preclude intermittent lockups. Reverting the Xarray conversion also works, but that change is too big to backport. The implementation is committed to Xarray at this point. Link: https://lore.kernel.org/linux-fsdevel/capcyv4hwhpx-mkueqxwdtj7wcczcn4rv-l4jsnuwlgyl_ue...@mail.gmail.com/ Fixes: b15cd800682f ("dax: Convert page fault handlers to XArray") Cc: Matthew Wilcox <wi...@infradead.org> Cc: Jan Kara <j...@suse.cz> Cc: <sta...@vger.kernel.org> Reported-by: Robert Barror <robert.bar...@intel.com> Reported-by: Seema Pandit <seema.pan...@intel.com> Signed-off-by: Dan Williams <dan.j.willi...@intel.com> --- fs/Kconfig | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/Kconfig b/fs/Kconfig index f1046cf6ad85..85eecd0d4c5d 100644 --- a/fs/Kconfig +++ b/fs/Kconfig @@ -66,6 +66,9 @@ config FS_DAX_PMD depends on FS_DAX depends on ZONE_DEVICE depends on TRANSPARENT_HUGEPAGE + # intermittent lockups since commit b15cd800682f "dax: Convert + # page fault handlers to XArray" + depends on BROKEN # Selected by DAX drivers that do not expect filesystem DAX to support # get_user_pages() of DAX mappings. I.e. "limited" indicates no support _______________________________________________ Linux-nvdimm mailing list Linux-nvdimm@lists.01.org https://lists.01.org/mailman/listinfo/linux-nvdimm
