linux-kernel - Re: fanotify bug on gdb -- hard crash

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Date:	Fri, 26 Dec 2014 23:14:44 +0100
From:	Pavel Machek <pavel@....cz>
To:	ivo.welch@...il.com
Cc:	linux-kernel@...r.kernel.org
Subject: Re: fanotify bug on gdb -- hard crash

On Fri 2014-12-26 22:45:38, ivo welch wrote:
> I am not a kernel developer, so forgive the intrusion.

Good bug reports are always welcome.

> I suspect I have found either a bug in gdb (less likely) or a bug in
> fanotify (more likely).  it is replicable, and the code is almost
> unchanged from the example in the fanotify man page.  to trigger it,
> all an su needs to do is to step through the program below with gdb
> 7.8.1 'n' command, and linux locks up the system pretty hard (reboot

Hard lockup -> this can't be gdb problem.

> required).  I have confirmed the replicability of this issue on a
> clean arch 2014.12.01 3.17.6-1 system and on a clean ubuntu 14.10
> system, both VMs created just to check it.  /iaw

Does it need root priviledges to trigger?

Best regards,
								Pavel


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