On Wed, Jul 01, 2020 at 10:24:29PM +0900, Tetsuo Handa wrote:

On 2020/07/01 19:08, Christian Borntraeger wrote:

quoted

On 30.06.20 19:57, Luis Chamberlain wrote:

quoted

On Fri, Jun 26, 2020 at 02:54:10AM +0000, Luis Chamberlain wrote:

quoted

On Wed, Jun 24, 2020 at 08:37:55PM +0200, Christian Borntraeger wrote:

quoted

On 24.06.20 20:32, Christian Borntraeger wrote:
[...]> 

quoted

So the translations look correct. But your change is actually a sematic change
if(ret) will only trigger if there is an error
if (KWIFEXITED(ret)) will always trigger when the process ends. So we will always overwrite -ECHILD
and we did not do it before. 

So the right fix is

diff --git a/kernel/umh.c b/kernel/umh.c
index f81e8698e36e..a3a3196e84d1 100644
--- a/kernel/umh.c
+++ b/kernel/umh.c

@@ -154,7 +154,7 @@ static void call_usermodehelper_exec_sync(struct subprocess_info *sub_info)
                 * the real error code is already in sub_info->retval or
                 * sub_info->retval is 0 anyway, so don't mess with it then.
                 */
-               if (KWIFEXITED(ret))
+               if (KWEXITSTATUS(ret))
                        sub_info->retval = KWEXITSTATUS(ret);

Well, it is not br_stp_call_user() but br_stp_start() which is expecting
to set sub_info->retval for both KWIFEXITED() case and KWIFSIGNALED() case.
That is, sub_info->retval needs to carry raw value (i.e. without "umh: fix
processed error when UMH_WAIT_PROC is used" will be the correct behavior).

br_stp_start() doesn't check for the raw value, it just checks for err
or !err. So the patch, "umh: fix processed error when UMH_WAIT_PROC is
used" propagates the correct error now.

Christian, can you try removing the binary temporarily and seeing if
you get your bridge working?

  Luis