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Sat, 18 Apr 2026 15:10:03 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface List-Id: Discussions about the use of FreeBSD-current List-Archive: https://lists.freebsd.org/archives/freebsd-current List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-current@FreeBSD.org MIME-Version: 1.0 X-ThreadId: APgOGAU08yF- Date: Sat, 18 Apr 2026 15:09:42 -0400 From: "Drew Gallatin" To: tuexen , current@freebsd.org Cc: "Ricardo Branco" , freebsd-current@freebsd.org Message-Id: <3b60c3e6-f53f-4084-a435-fe5371c56e58@app.fastmail.com> In-Reply-To: References: <9d640ae4-7133-4d4f-917f-d715ab71ee7b@suse.de> Subject: Re: panic: assertion failed in iflib_txq_drain() Content-Type: multipart/alternative; boundary=de29220a76d19c76af1d1ba6f005ef33c6782576 --de29220a76d19c76af1d1ba6f005ef33c6782576 Content-Type: text/plain Content-Transfer-Encoding: 7bit Sorry, looking into this now. I did not test this change with the mp_ring path.. i don't see how fixing the counters could cause this panic. Looking at it now.. Drew On Sat, Apr 18, 2026, at 1:38 PM, Michael Tuexen wrote: > > On 18. Apr 2026, at 19:14, David Wolfskill wrote: > > > > On Sat, Apr 18, 2026 at 03:53:33PM +0200, Michael Tuexen wrote: > >> ... > >>> So... one of the machines on which I track head got this, as well -- my > >>> (mostly-)headless build machine. (2 laptops, updated in sync with the > >>> build machine, did not panic. One of those also uses a wired NIC.) > >> Do the network drivers of the machines not being affected use iflib? > > > > Apparently not -- they are em(4), iwm(4), & iwn(4), while the panicking > > machine uses igb(4). > > > >> I do see the problem also on one of my machines and local testing shows that > >> https://cgit.FreeBSD.org/src/commit/?id=3fade68cfdf95ee0b517b5d69b270bd8da633404 > >> is the problem. At least reverting it locally resolves the problem. > >> Can you confirm this? > > > > I can, and do: after reverting main-n285140-3fade68cfdf9 & rebuilding, > > I am able to ssh in without issue; the machine reports: > > > > freebeast(16.0-C)[2] uname -aUK > > FreeBSD freebeast.catwhisker.org 16.0-CURRENT FreeBSD 16.0-CURRENT #549 main-n285180-23a84efeb191: Sat Apr 18 17:01:25 UTC 2026 root@freebeast.catwhisker.org:/common/S3/obj/usr/src/amd64.amd64/sys/GENERIC amd64 1600015 1600015 > > > > Thanks! > You could also disable TSO. I will put up a review for a fix soon. > > Best regards > Michael > > > > Peace, > > david > > -- > > David H. Wolfskill david@catwhisker.org > > > > See https://www.catwhisker.org/~david/publickey.gpg for my public key. > > > --de29220a76d19c76af1d1ba6f005ef33c6782576 Content-Type: text/html Content-Transfer-Encoding: quoted-printable
Sorry, looki= ng into this now.  I did not test this change with the mp_ring path= .. i don't see how fixing the counters could cause this panic.  &nb= sp;Looking at it now..

Drew

On Sat, Apr 18, 2026, at 1:38 PM, Michael Tuexen wrote:
> On 18. Apr 2026, at = 19:14, David Wolfskill <david= @catwhisker.org> wrote:
> 
> On Sa= t, Apr 18, 2026 at 03:53:33PM +0200, Michael Tuexen wrote:
>= ;> ...
>>> So... one of the machines on which I tr= ack head got this, as well -- my
>>> (mostly-)headles= s build machine.  (2 laptops, updated in sync with the
&g= t;>> build machine, did not panic.  One of those also uses a = wired NIC.)
>> Do the network drivers of the machines no= t being affected use iflib?
> 
> Apparent= ly not -- they are em(4), iwm(4), & iwn(4), while the panicking
> machine uses igb(4).
> 
>> = I do see the problem also on one of my machines and local testing shows = that
>> https://cgit.FreeBSD= .org/src/commit/?id=3D3fade68cfdf95ee0b517b5d69b270bd8da633404 <<= a href=3D"https://cgit.freebsd.org/src/commit/?id=3D3fade68cfdf95ee0b517= b5d69b270bd8da633404">https://cgit.freebsd.org/src/commit/?id=3D3fade68c= fdf95ee0b517b5d69b270bd8da633404>
>> is the probl= em. At least reverting it locally resolves the problem.
>&g= t; Can you confirm this?
> 
> I can, and = do:  after reverting main-n285140-3fade68cfdf9 & rebuilding,
> I am able to ssh in without issue; the machine reports:
> 
> freebeast(16.0-C)[2] uname -aUK
> FreeBSD freebea= st.catwhisker.org 16.0-CURRENT FreeBSD 16.0-CURRENT #549 main-n28518= 0-23a84efeb191: Sat Apr 18 17:01:25 UTC 2026    &nbs= p;root@freebeast.catwhi= sker.org:/common/S3/obj/usr/src/amd64.amd64/sys/GENERIC amd64 160001= 5 1600015
> 
> Thanks!
You coul= d also disable TSO. I will put up a review for a fix soon.
Best regards
Michael
> 
> Peace,
> david
> -- 
>= ; David H. Wolfskill        &nbs= p;           &nbs= p;         david@catwhisker.org
> 



=

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