| Message ID | 20240611215528.846776-1-bmarzins@redhat.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | dm-raid: Fix WARN_ON_ONCE check for sync_thread in raid_resume | expand |
Hi, 在 2024/06/12 5:55, Benjamin Marzinski 写道: > rm-raid devices will occasionally trigger the following warning when > being resumed after a table load because DM_RECOVERY_RUNNING is set: > > WARNING: CPU: 7 PID: 5660 at drivers/md/dm-raid.c:4105 raid_resume+0xee/0x100 [dm_raid] > > The failing check is: > WARN_ON_ONCE(test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)); > > This check is designed to make sure that the sync thread isn't > registered, but md_check_recovery can set MD_RECOVERY_RUNNING without > the sync_thread ever getting registered. Instead of checking if > MD_RECOVERY_RUNNING is set, check if sync_thread is non-NULL. > > Fixes: 16c4770c75b1 ("dm-raid: really frozen sync_thread during suspend") > Suggested-by: Yu Kuai <yukuai1@huaweicloud.com> > Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com> > --- > drivers/md/dm-raid.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c > index abe88d1e6735..74184989fd15 100644 > --- a/drivers/md/dm-raid.c > +++ b/drivers/md/dm-raid.c > @@ -4102,7 +4102,7 @@ static void raid_resume(struct dm_target *ti) > rs_set_capacity(rs); > > WARN_ON_ONCE(!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)); > - WARN_ON_ONCE(test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)); > + WARN_ON_ONCE(mddev->sync_thread); sync_thread is protected by rcu, I think this will cause spares warning. Please use: rcu_dereferenct_protected(mddev->sync_thread, lockdep_is_held(&mddev->reconfig_mutex)); Otherwise, LGTM. Thanks > clear_bit(RT_FLAG_RS_FROZEN, &rs->runtime_flags); > mddev_lock_nointr(mddev); > mddev->ro = 0; >
diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c index abe88d1e6735..74184989fd15 100644 --- a/drivers/md/dm-raid.c +++ b/drivers/md/dm-raid.c @@ -4102,7 +4102,7 @@ static void raid_resume(struct dm_target *ti) rs_set_capacity(rs); WARN_ON_ONCE(!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)); - WARN_ON_ONCE(test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)); + WARN_ON_ONCE(mddev->sync_thread); clear_bit(RT_FLAG_RS_FROZEN, &rs->runtime_flags); mddev_lock_nointr(mddev); mddev->ro = 0;
rm-raid devices will occasionally trigger the following warning when being resumed after a table load because DM_RECOVERY_RUNNING is set: WARNING: CPU: 7 PID: 5660 at drivers/md/dm-raid.c:4105 raid_resume+0xee/0x100 [dm_raid] The failing check is: WARN_ON_ONCE(test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)); This check is designed to make sure that the sync thread isn't registered, but md_check_recovery can set MD_RECOVERY_RUNNING without the sync_thread ever getting registered. Instead of checking if MD_RECOVERY_RUNNING is set, check if sync_thread is non-NULL. Fixes: 16c4770c75b1 ("dm-raid: really frozen sync_thread during suspend") Suggested-by: Yu Kuai <yukuai1@huaweicloud.com> Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com> --- drivers/md/dm-raid.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)