Date: Mon, 8 Nov 2010 09:42:41 -0500 From: John Baldwin <jhb@freebsd.org> To: freebsd-current@freebsd.org Cc: freebsd-fs@freebsd.org, Ivan Voras <ivoras@freebsd.org> Subject: Re: another fuse panic Message-ID: <201011080942.41546.jhb@freebsd.org> In-Reply-To: <ib8nas$9de$1@dough.gmane.org> References: <4CD7C8FC.900@icyb.net.ua> <ib8nas$9de$1@dough.gmane.org>
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On Monday, November 08, 2010 6:35:55 am Ivan Voras wrote:
> On 11/08/10 10:55, Andriy Gapon wrote:
> >
> > JFYI.
> > Fatal trap 12: page fault while in kernel mode
>
> Can you find any set of circumstances which make this repeatable?
>
> This panic apparently goes like this:
>
> 1) used by devfs_open():
> 47 static struct cdevsw fuse_cdevsw = {
> 48 .d_open = fusedev_open,
>
> 2) in fusedev_open():
> 119 fdata = fdata_alloc(dev, td->td_ucred);
>
> 3) in fdata_alloc():
> 297 data->daemoncred = crhold(cred);
>
> in other words, td->td_ucred from td passed to fusedev_open (presumably
> when the device is opened from the userland) appears to be NULL.
>
> I don't know if there is any normal set of circumstances under which
> this is expected.
No, td_ucred should never be NULL.
--
John Baldwin
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