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SubjectCommit edf064e7c (btrfs: nowait aio support) breaks shells
commit edf064e7c6fec3646b06c944a8e35d1a3de5c2c3 (HEAD, refs/bisect/bad)
Author: Goldwyn Rodrigues <rgoldwyn@suse.com>
Date: Tue Jun 20 07:05:49 2017 -0500

btrfs: nowait aio support

apparently breaks several shell related features on my system.
In zsh history stopped working, because no new entries are added
anymore.
I fist noticed the issue when I tried to build mplayer. It uses a shell
script to generate a help_mp.h file:

% help/help_create.sh help/help_mp-en.h UTF-8

This file gets corrupted:

--- help_mp_good.h 2017-07-04 05:38:33.161640826 +0200
+++ help_mp_bad.h 2017-07-04 05:51:00.650730726 +0200
@@ -1,14 +1,8 @@
-/* WARNING! This is a generated file, do NOT edit.
- * See the help/ subdirectory for the editable files. */

-#ifndef MPLAYER_HELP_MP_H
-#define MPLAYER_HELP_MP_H
-
-#include <inttypes.h>
-#include "config.h"
+#endif /* MPLAYER_HELP_MP_H */
+he English master file */

-// $Revision: 37846 $
-// MASTER FILE. Use this file as base for translations.
+ for translations.
...
(I have attached the testcase.)
/dev/sdc3 on / type btrfs (rw,noatime,lazytime,compress=lzo,ssd,noacl,space_cache=v2,subvolid=5,subvol=/)
# cat /sys/block/sdc/queue/scheduler
[none] mq-deadline

--
Markus
[unhandled content-type:application/octet-stream]
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