linux-kernel - Re: general protection fault in delayed_uprobe

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Date:   Thu, 21 Mar 2019 17:18:41 +0100
From:   Oleg Nesterov <oleg@...hat.com>
To:     syzbot <syzbot+eab6e18f95a9fe69005e@...kaller.appspotmail.com>
Cc:     acme@...nel.org, alexander.shishkin@...ux.intel.com,
        jolsa@...hat.com, linux-kernel@...r.kernel.org, mingo@...hat.com,
        namhyung@...nel.org, peterz@...radead.org,
        ravi.bangoria@...ux.ibm.com, rostedt@...dmis.org,
        songliubraving@...com, syzkaller-bugs@...glegroups.com
Subject: Re: general protection fault in delayed_uprobe_remove

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@...com>
> 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@...kaller.appspotmail.com
> Fixes: a6ca88b241d5 ("trace_uprobe: support reference counter in fd-based
> uprobe")