Re: general protection fault in delayed_uprobe_remove

[syzbot]

syzbot has bisected this bug to:

commit a6ca88b241d5e929e6e60b12ad8cd288f0ffa256
Author: Song Liu <songliubraving@xxxxxx>
Date:   Tue Oct 2 05:36:36 2018 +0000

    trace_uprobe: support reference counter in fd-based uprobe

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=12c86993200000
start commit:   a6ca88b2 trace_uprobe: support reference counter in fd-bas..
git tree:       linux-next
final crash:    https://syzkaller.appspot.com/x/report.txt?x=11c86993200000
console output: https://syzkaller.appspot.com/x/log.txt?x=16c86993200000
kernel config:  https://syzkaller.appspot.com/x/.config?x=2a22859d870756c1
dashboard link: https://syzkaller.appspot.com/bug?extid=eab6e18f95a9fe69005e
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=137174f5400000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1278485d400000

Reported-by: syzbot+eab6e18f95a9fe69005e@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: a6ca88b241d5 ("trace_uprobe: support reference counter in fd-based  
uprobe")