dm-mpath shouldn't be calling dm_get_device() in multipath_message(). If you run: # dmsetup message <mpath_dev> 0 "fail_path <device_not_in_multipath>" the dm_get_device() call in multipath_message() will add that incorrect device to the devices list, fail to find a matching pgpath, and then remove it. multipath shouldn't be messing with the devices table outside of its constructor and destructor. To fix it, this patchset factors out a helper function from dm_get_device() to turn the device path string into a dev_t. multipath_message() calls that helper function and uses the dev_t to find the correct pgpath instead. Benjamin Marzinski (2): dm: factor out helper function from dm_get_device dm mpath: don't call dm_get_device in multipath_message drivers/md/dm-mpath.c | 11 ++++------- drivers/md/dm-table.c | 33 ++++++++++++++++++++++++--------- include/linux/device-mapper.h | 5 +++++ 3 files changed, 33 insertions(+), 16 deletions(-) -- 2.45.0
