netdev - Re: [syzbot ci] Re: net: Revert tx queue length on partial failure in dev_qdisc_change_tx_queue

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Message-ID: <20250807082659.5557e42b@kernel.org>
Date: Thu, 7 Aug 2025 08:26:59 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Aleksandr Nogikh <nogikh@...gle.com>
Cc: dvyukov@...gle.com, linux-kernel-mentees@...ts.linux.dev,
 linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
 syzbot@...ts.linux.dev, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot ci] Re: net: Revert tx queue length on partial failure
 in dev_qdisc_change_tx_queue_len()

On Thu, 7 Aug 2025 17:09:24 +0200 Aleksandr Nogikh wrote:
> > One more thing, would it be possible to add / correct the DKIM on these
> > messages? Looks like when our bots load the syzbot ci emails from lore
> > the DKIM verification fails. I see a X-Google-DKIM-Signature: header,
> > but no real DKIM-Signature:  
> 
> Thanks for letting us know!
> Do these bots also face DKIM verification issues with regular syzbot
> emails? We send them absolutely the same way, so the problem must
> affect all reports.

I haven't checked, TBH, we don't have any automation for normal
reports :( For the CI reports I was trying to hook them up to
some actions, kick the patch out of our test branch unless human
confirms that the report is a false positive.

> We use the GAE Mail API, and its documentation[1] says that it signs
> emails with DKIM only if a custom domain is configured. Since we send
> from the default GAE domain, this would explain the verification
> failures.
> 
> We'll explore the ways to fix this.
> 
> [1] https://cloud.google.com/appengine/docs/standard/services/mail?tab=go#authentication_with_domainkeys_identified_mail_dkim