netdev - linux-next: umh: fix processed error when UMH_WAIT_PROC is used seems to break linux bridge on s390x (bisected)

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Date:   Tue, 23 Jun 2020 16:11:57 +0200
From:   Christian Borntraeger <borntraeger@...ibm.com>
To:     mcgrof@...nel.org
Cc:     ast@...nel.org, axboe@...nel.dk, bfields@...ldses.org,
        bridge@...ts.linux-foundation.org, chainsaw@...too.org,
        christian.brauner@...ntu.com, chuck.lever@...cle.com,
        davem@...emloft.net, dhowells@...hat.com,
        gregkh@...uxfoundation.org, jarkko.sakkinen@...ux.intel.com,
        jmorris@...ei.org, josh@...htriplett.org, keescook@...omium.org,
        keyrings@...r.kernel.org, kuba@...nel.org,
        lars.ellenberg@...bit.com, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-nfs@...r.kernel.org,
        linux-security-module@...r.kernel.org, nikolay@...ulusnetworks.com,
        philipp.reisner@...bit.com, ravenexp@...il.com,
        roopa@...ulusnetworks.com, serge@...lyn.com, slyfox@...too.org,
        viro@...iv.linux.org.uk, yangtiezhu@...ngson.cn,
        netdev@...r.kernel.org, markward@...ux.ibm.com,
        linux-s390@...r.kernel.or
Subject: linux-next: umh: fix processed error when UMH_WAIT_PROC is used seems to break linux bridge on s390x (bisected)

Jens Markwardt reported a regression in the linux-next runs.  with "umh: fix
processed error when UMH_WAIT_PROC is used" (from linux-next) a linux bridge
with an KVM guests no longer activates :

without patch
# ip addr show dev virbr1
6: virbr1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 52:54:00:1e:3f:c0 brd ff:ff:ff:ff:ff:ff
    inet 192.168.254.254/24 brd 192.168.254.255 scope global virbr1
       valid_lft forever preferred_lft forever

with this patch the bridge stays DOWN with NO-CARRIER

# ip addr show dev virbr1
6: virbr1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
    link/ether 52:54:00:1e:3f:c0 brd ff:ff:ff:ff:ff:ff
    inet 192.168.254.254/24 brd 192.168.254.255 scope global virbr1
       valid_lft forever preferred_lft forever

This was bisected in linux-next. Reverting from linux-next also fixes the issue.

Any idea?

Christian