On 05/07/2021 15:50, Theodore Ts'o wrote: > The function jbd2_journal_unregister_shrinker() was getting called > twice when the file system was getting unmounted. On Power and ARM > platforms this was causing kernel crash when unmounting the file > system, when a percpu_counter was destroyed twice. > > Fix this by removing jbd2_journal_[un]register_shrinker() functions, > and inlining the shrinker setup and teardown into > journal_init_common() and jbd2_journal_destroy(). This means that > ext4 and ocfs2 now no longer need to know about registering and > unregistering jbd2's shrinker. > > Also, while we're at it, rename the percpu counter from > j_jh_shrink_count to j_checkpoint_jh_count, since this makes it > clearer what this counter is intended to track. > > Fixes: 4ba3fcdde7e3 ("jbd2,ext4: add a shrinker to release checkpointed buffers") > Reported-by: Jon Hunter <jonathanh@xxxxxxxxxx> > Reported-by: Sachin Sant <sachinp@xxxxxxxxxxxxxxxxxx> > Tested-by: Sachin Sant <sachinp@xxxxxxxxxxxxxxxxxx> > Reviewed-by: Jan Kara <jack@xxxxxxx> > Signed-off-by: Theodore Ts'o <tytso@xxxxxxx> Thanks, works for me. Tested-by: Jon Hunter <jonathanh@xxxxxxxxxx> Cheers Jon -- nvpublic