From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mout.gmx.net ([212.227.15.18]:53320 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751003AbcLDQDB (ORCPT ); Sun, 4 Dec 2016 11:03:01 -0500 Received: from thetick.localnet ([93.181.44.247]) by mail.gmx.com (mrgmx003 [212.227.17.190]) with ESMTPSA (Nemesis) id 0MPm54-1cIUvh1F7i-004xAB for ; Sun, 04 Dec 2016 17:02:59 +0100 From: Marc Joliet To: linux-btrfs@vger.kernel.org Subject: Re: system hangs due to qgroups Date: Sun, 04 Dec 2016 17:02:58 +0100 Message-ID: <11661267.CWr4ZNOWmj@thetick> In-Reply-To: <20161204021019.GA25519@angband.pl> References: <1776088.42rHLKPlSp@thetick> <4615776.dvopQOigxY@thetick> <20161204021019.GA25519@angband.pl> MIME-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart23506725.eed1Tjffmm"; micalg="pgp-sha256"; protocol="application/pgp-signature" Sender: linux-btrfs-owner@vger.kernel.org List-ID: --nextPart23506725.eed1Tjffmm Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" On Sunday 04 December 2016 03:10:19 Adam Borowski wrote: > On Sat, Dec 03, 2016 at 10:46:40PM +0100, Marc Joliet wrote: > > As it's a rescue shell, I have only the one shell AFAIK, and it's o= ccupied > > by mount. So I can't tell if there are dmesg entries, however, whe= n this > > happens during a normal running system, I never saw any dmesg entri= es. >=20 > You can use "open" (might be named "openvt") to spawn a shell on > tty2/tty3/etc. And if you have "screen" installed, Ctrl-a c spawns n= ew > terminals (Ctrl-a n/p/0-9 to switch). I was actually considering adding tmux to the list of programs in the=20= initramfs after this experience :) . > > The output of sysrq+t is too big to capture all of it (i.e., I can'= t > > scroll > > back to the beginning) >=20 > You may use netconsole to log everything kernel says to another machi= ne. I > can't provide you with the incantations from the top of my head (got = working > serial (far more reliable) on all my dev boxes, and it doesn't work w= ith > bridging ie containers on production), but as your rescue shell has n= o > network sharing, assuming your network card driver supports a feature= > netconsole needs _and_ stars were aligned right when your network car= d was > manufactured, netconsole is a valuable aid. >=20 > The system might be not dead enough to stop userland network logging = from > getting through, too. OK, I'll look up netconsole. > Meow! Thanks =2D-=20 Marc Joliet =2D- "People who think they know everything really annoy those of us who kno= w we don't" - Bjarne Stroustrup --nextPart23506725.eed1Tjffmm Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part. Content-Transfer-Encoding: 7Bit -----BEGIN PGP SIGNATURE----- iQIcBAABCAAGBQJYRD4yAAoJEL/Q5oYsiHj0F18P/2R4myn3EwQvB1eZHr3tCpVQ FHH6obBCnqw78zpcgPAg8q3anPImWlWBToH5ljB615GFqyIgMgXWwqobmhnZbuDu 0hh4XDs06GG1F0c4qaORj9Zyb1fzsI27kDwe5bWn16+81UPTR06yqbYtQ+l9vK7I LLR4OWOdHZJGT5uPjusPYenqvfIHtGmUf7AKNN4PJ1eShRKaQ9GFZAn61lUFxxy8 jY0PoEm8dv4vLfPilE0wmdyZdPnRhfJx0AqoGo+aCBknr8J1B+pOMeMmNi+3EHci uRaoqIB2lVrqyRvNKAwrbz+JIjc7IORbaMAMes6USseMB+HPqs7zSe+mCUTkF6de o+37MiPW5kti+ObQYUJFtCaeINAWZbvSJ9VBGcSEWCtiHW/Z0ZZF4OwXxIs16Xzz iSZPC4y+p1rBojom8XwqBMxkCy4z4H5n7bRXH7zMmpvkyDTncjro94J5nAlW8jQW eQv2WOSBbVZ0LWs429umcqbCeLbFXRj8o7nEgmhuko/p6yhWqLeMxDnvMigVKACD IXOf+seHHy8hRJ/uQk/TY5H1hJbmbMd47W5158F9hfS50fLhw0dcK6QbSCc5LOLx aeny1OQ3h49yztetSJMPP8Sj7lS/5KdRlV1ixLM0IbofHnLm8Z4WuiumU3gUsEl3 1qnOnOWEJWwk9eFBIWYY =699O -----END PGP SIGNATURE----- --nextPart23506725.eed1Tjffmm--