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SubjectRe: WARNING: suspicious RCU usage in xfrm_get_sadinfo
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syzbot has bisected this bug to:

commit f10e0010fae8174dc20bdc872bcaa85baa925cb7
Author: Su Yanjun <suyj.fnst@cn.fujitsu.com>
Date: Thu Mar 7 01:54:08 2019 +0000

net: xfrm: Add '_rcu' tag for rcu protected pointer in netns_xfrm

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=11e8e843200000
start commit: f10e0010 net: xfrm: Add '_rcu' tag for rcu protected point..
git tree: linux-next
final crash: https://syzkaller.appspot.com/x/report.txt?x=13e8e843200000
console output: https://syzkaller.appspot.com/x/log.txt?x=15e8e843200000
kernel config: https://syzkaller.appspot.com/x/.config?x=59cd5d43b5df6955
dashboard link: https://syzkaller.appspot.com/bug?extid=2792672c6a63f1dc867c
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11a2e24d200000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=131ab8ef200000

Reported-by: syzbot+2792672c6a63f1dc867c@syzkaller.appspotmail.com
Fixes: f10e0010 ("net: xfrm: Add '_rcu' tag for rcu protected pointer in
netns_xfrm")

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