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SubjectRe: general protection fault in sctp_sched_rr_dequeue
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syzbot has bisected this bug to:

commit 7efba10d6bd22030fb5931e50bf97496f932f00e
Author: Xin Long <lucien.xin@gmail.com>
Date: Mon Jan 28 07:08:46 2019 +0000

sctp: add SCTP_FUTURE_ASOC and SCTP_CURRENT_ASSOC for
SCTP_STREAM_SCHEDULER sockopt

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=14eec757200000
start commit: 7efba10d sctp: add SCTP_FUTURE_ASOC and SCTP_CURRENT_ASSOC..
git tree: upstream
final crash: https://syzkaller.appspot.com/x/report.txt?x=16eec757200000
console output: https://syzkaller.appspot.com/x/log.txt?x=12eec757200000
kernel config: https://syzkaller.appspot.com/x/.config?x=872be05707464aaa
dashboard link: https://syzkaller.appspot.com/bug?extid=4c9934f20522c0efd657
userspace arch: amd64
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11cd9b03200000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=127de8e7200000

Reported-by: syzbot+4c9934f20522c0efd657@syzkaller.appspotmail.com
Fixes: 7efba10d ("sctp: add SCTP_FUTURE_ASOC and SCTP_CURRENT_ASSOC for
SCTP_STREAM_SCHEDULER sockopt")

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