netdev - possible deadlock in ppp_dev

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Message-ID: <94eb2c05a284415b6805620bca4e@google.com>
Date:   Fri, 05 Jan 2018 10:41:00 -0800
From:   syzbot <syzbot+367889b9c9e279219175@...kaller.appspotmail.com>
To:     g.nault@...halink.fr, linux-kernel@...r.kernel.org,
        linux-ppp@...r.kernel.org, netdev@...r.kernel.org,
        paulus@...ba.org, syzkaller-bugs@...glegroups.com
Subject: possible deadlock in ppp_dev_uninit

Hello,

syzbot tried to test the proposed patch but build/boot failed:

failed to copy test binary to VM: failed to run /usr/bin/scp [scp -P 22 -i  
/syzkaller/jobs/linux/image/key -F /dev/null -o  
UserKnownHostsFile=/dev/null -o BatchMode=yes -o IdentitiesOnly=yes -o  
StrictHostKeyChecking=no -o ConnectTimeout=10 /tmp/syzkaller180475523  
root@...128.0.60:./syzkaller180475523]: exit status 1
ssh: connect to host 10.128.0.60 port 22: Connection timed out
lost connection



Tested on commit d1616f07e8f1a4a490d1791316d4a68906b284aa
git://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/master
compiler: gcc (GCC) 7.1.1 20170620
Patch is attached.
Kernel config is attached.



View attachment "config.txt" of type "text/plain" (134344 bytes)

View attachment "patch.txt" of type "text/plain" (675 bytes)