linux-kernel - Re: regression in iwlwifi: page fault in iwl_dbg_tlv_alloc

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Message-ID: <s5h5z42s44x.wl-tiwai@suse.de>
Date:   Tue, 12 Jan 2021 13:58:54 +0100
From:   Takashi Iwai <tiwai@...e.de>
To:     Kalle Valo <kvalo@...eaurora.org>
Cc:     Michal Kubecek <mkubecek@...e.cz>, linux-wireless@...r.kernel.org,
        Mordechay Goodstein <mordechay.goodstein@...el.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Arjen de Korte <suse+build@...korte.org>,
        Luca Coelho <luciano.coelho@...el.com>
Subject: Re: regression in iwlwifi: page fault in iwl_dbg_tlv_alloc_region() (commit ba8f6f4ae254)

On Tue, 12 Jan 2021 13:45:33 +0100,
Kalle Valo wrote:
> 
> Takashi Iwai <tiwai@...e.de> writes:
> 
> > On Tue, 12 Jan 2021 12:33:14 +0100,
> > Kalle Valo wrote:
> >> 
> >> (adding luca)
> >> 
> >> Michal Kubecek <mkubecek@...e.cz> writes:
> >> 
> >> > FYI, there is a regression in iwlwifi driver caused by commit
> >> > ba8f6f4ae254 ("iwlwifi: dbg: add dumping special device memory")
> >> > reported at
> >> >
> >> >   https://bugzilla.kernel.org/show_bug.cgi?id=210733
> >> >   https://bugzilla.suse.com/show_bug.cgi?id=1180344
> >> >
> >> > The problem seems to be an attempt to write terminating null character
> >> > into a string which may be read only. There is also a proposed fix.
> >> 
> >> Can someone submit a proper patch, please? See instructions below how to
> >> submit.
> >> 
> >> And please add Fixes tag to the commit log:
> >> 
> >> Fixes: ba8f6f4ae254 ("iwlwifi: dbg: add dumping special device memory")
> >
> > OK, I'll do it for my own
> 
> Thanks.
> 
> > but really I hoped that someone would have reacted on the bugzilla
> > report before the official patch submission. So far no one from the
> > upstream devs showed interest in the bug at all, unfortunately.
> 
> Bugzilla is problematic as I don't know if anyone tracks it actively, at
> least I don't have time for that. I recommend reporting all wireless
> issues to mailing lists to make sure everyone see it.

I share your feeling as a subsystem maintainer, but at the same time,
I see it's a big problem if the whole bugzilla reports are just
silently ignored.  If it's a void, shouldn't we rather shut it down?

And, although a mailing list is fine to report via only some texts or
some patches, it's not suitable to attach large logs or such, which is
often essential for debugging.  Thanks to lore, the archivability is
no longer a problem with ML recently, but the lack of data assignment
is another problem, IMO.


thanks,

Takashi