Commit b7992200 authored Jun 08, 2024 by Kent Overstreet

bcachefs: Add missing synchronize_srcu_expedited() call when shutting down



We use the polling interface to srcu for tracking pending frees; when
shutting down we don't need to wait for an srcu barrier to free them,
but SRCU still gets confused if we shutdown with an outstanding grace
period.

Reported-by:  <syzbot+6a038377f0a594d7d44e@syzkaller.appspotmail.com>
Reported-by:  <syzbot+0ece6edfd05ed20e32d9@syzkaller.appspotmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

parent 9432e90d

fs/bcachefs/btree_iter.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -3401,8 +3401,10 @@ void bch2_fs_btree_iter_exit(struct bch_fs *c)
		bch2_time_stats_exit(&s->lock_hold_times);
		}

		if (c->btree_trans_barrier_initialized)
		if (c->btree_trans_barrier_initialized) {
		synchronize_srcu_expedited(&c->btree_trans_barrier);
		cleanup_srcu_struct(&c->btree_trans_barrier);
		}
		mempool_exit(&c->btree_trans_mem_pool);
		mempool_exit(&c->btree_trans_pool);
		}