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SubjectRe: inconsistent lock state in rxrpc_put_client_connection_id
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syzbot has bisected this bug to:

commit 5273a191dca65a675dc0bcf3909e59c6933e2831
Author: David Howells <dhowells@redhat.com>
Date: Thu Jan 30 21:50:36 2020 +0000

rxrpc: Fix NULL pointer deref due to call->conn being cleared on disconnect

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=173d9dbee00000
start commit: 6992ca0d Merge branch 'parisc-5.6-1' of git://git.kernel.o..
git tree: upstream
final crash: https://syzkaller.appspot.com/x/report.txt?x=14bd9dbee00000
console output: https://syzkaller.appspot.com/x/log.txt?x=10bd9dbee00000
kernel config: https://syzkaller.appspot.com/x/.config?x=f22d38d7f9a488a8
dashboard link: https://syzkaller.appspot.com/bug?extid=d82f3ac8d87e7ccbb2c9
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14317dbee00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=145a44f6e00000

Reported-by: syzbot+d82f3ac8d87e7ccbb2c9@syzkaller.appspotmail.com
Fixes: 5273a191dca6 ("rxrpc: Fix NULL pointer deref due to call->conn being cleared on disconnect")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection

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