Re: general protection fault in delayed_uprobe_remove

[Oleg Nesterov]

iiuc,

#syz fix: Uprobes: Fix kernel oops with delayed_uprobe_remove()

On 03/21, syzbot wrote:
>
> 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")