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| author | Liu Bo <bo.li.liu@oracle.com> | 2017-09-13 12:09:28 -0600 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2017-10-30 12:27:57 +0100 |
| commit | 6939f667247ed792535c0697a99f600d6770f127 (patch) | |
| tree | 388c1a6bd0c8f24adff2ce5c1c482c6275e684be | |
| parent | 18fdc67900c5bfd1eeb41cfa50ea6f2eb7266f73 (diff) | |
| download | op-kernel-dev-6939f667247ed792535c0697a99f600d6770f127.zip op-kernel-dev-6939f667247ed792535c0697a99f600d6770f127.tar.gz | |
Btrfs: fix confusing worker helper info in stacktrace
We've seen the following backtrace stack in ftrace or dmesg log,
kworker/u16:10-4244 [000] 241942.480955: function: btrfs_put_ordered_extent
kworker/u16:10-4244 [000] 241942.480956: kernel_stack: <stack trace>
=> finish_ordered_fn (ffffffffa0384475)
=> btrfs_scrubparity_helper (ffffffffa03ca577) <-----"incorrect"
=> btrfs_freespace_write_helper (ffffffffa03ca98e) <-----"correct"
=> process_one_work (ffffffff81117b2f)
=> worker_thread (ffffffff81118c2a)
=> kthread (ffffffff81121de0)
=> ret_from_fork (ffffffff81d7087a)
btrfs_freespace_write_helper is actually calling normal_worker_helper
instead of btrfs_scrubparity_helper, so somehow kernel has parsed the
incorrect function address while unwinding the stack,
btrfs_scrubparity_helper really shouldn't be shown up.
It's caused by compiler doing inline for our helper function, adding a
noinline tag can fix that.
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ use noinline_for_stack ]
Signed-off-by: David Sterba <dsterba@suse.com>
| -rw-r--r-- | fs/btrfs/async-thread.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/btrfs/async-thread.c b/fs/btrfs/async-thread.c index e00c8a9..d554074 100644 --- a/fs/btrfs/async-thread.c +++ b/fs/btrfs/async-thread.c @@ -67,7 +67,7 @@ struct btrfs_workqueue { static void normal_work_helper(struct btrfs_work *work); #define BTRFS_WORK_HELPER(name) \ -void btrfs_##name(struct work_struct *arg) \ +noinline_for_stack void btrfs_##name(struct work_struct *arg) \ { \ struct btrfs_work *work = container_of(arg, struct btrfs_work, \ normal_work); \ |
