Re: fanotify bug on gdb -- hard crash

From: Pavel Machek
Date: Fri Dec 26 2014 - 17:14:52 EST

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,

(cesky, pictures)
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