Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf

Cross-merge bpf fixes after downstream PR.

No conflicts.

Adjacent changes in:
Auto-merging include/linux/bpf.h
Auto-merging include/linux/bpf_verifier.h
Auto-merging kernel/bpf/btf.c
Auto-merging kernel/bpf/verifier.c
Auto-merging kernel/trace/bpf_trace.c
Auto-merging tools/testing/selftests/bpf/progs/test_tp_btf_nullable.c

Signed-off-by: Alexei Starovoitov <ast@kernel.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 814320948645..eff0dd1ae62f 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -4262,6 +4262,15 @@ void __cold close_ctree(struct btrfs_fs_info *fs_info)
 	 * already the cleaner, but below we run all pending delayed iputs.
 	 */
 	btrfs_flush_workqueue(fs_info->fixup_workers);
+	/*
+	 * Similar case here, we have to wait for delalloc workers before we
+	 * proceed below and stop the cleaner kthread, otherwise we trigger a
+	 * use-after-tree on the cleaner kthread task_struct when a delalloc
+	 * worker running submit_compressed_extents() adds a delayed iput, which
+	 * does a wake up on the cleaner kthread, which was already freed below
+	 * when we call kthread_stop().
+	 */
+	btrfs_flush_workqueue(fs_info->delalloc_workers);
 
 	/*
 	 * After we parked the cleaner kthread, ordered extents may have