Date: Tue, 15 Dec 2009 15:35:43 +0100 From: Alexander Leidinger <Alexander@Leidinger.net> To: stable@freebsd.org Subject: Stability problems with 7-stable (after 7.1 -> 7.2 -> 7-stable) Message-ID: <20091215153543.2686145v583um280@webmail.leidinger.net>
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Hi, please CC me on replies. I have a system which was at 7.1-pX. After the update to 7.2-p5 it started to exhibit deadlocks after some minutes of uptime. With 7.1 (generic kernel) it was running fine, with 7.2 generic the problems started directly. The system is now at 7-stable with a custom kernel (http://www.Leidinger.net/test/ALCATRAZ), basically generic without unneeded drivers plus witness/invariants/sw-watchdog. The system is an AMD Dual Core with NVidia MCP61 chipset (http://www.Leidinger.net/test/dmesg.alcatraz), 2 GB RAM, 2 harddisks and FreeBSD 32bit install. On the system are 3 jails (one postfix+mysql+apache, one mysql+apache+some-perl-service, one apache+mysql+xmpp-server). All of them have a 7-stable world. The 2 disks where configured with 3 partition pairs for root-mirror, swap-mirror, and jail-mirror. I tested with and without SMP, both schedulers, with WITNESS/INVARIANTS, and by removing one part of each mirror (to rule out that the disks are not in sync). In all cases the system was not stable and deadlocked after several minutes (even with only the mail-jail up and running). First no interaction via ssh is possible anymore, then even ping does not work anymore. After configuring the watchdog, I got at least the system back online automatically... :( After reading http://www.mail-archive.com/freebsd-stable@freebsd.org/msg96901.html I decided to switch the FS for the jails to ZFS (currently only on one harddisk, the other partition for it is still with UFS, but not mounted at all) as a test. Now with a little bit of kernel tuning for ZFS (http://www.Leidinger.net/test/loader.conf.alcatraz) I was able to keep the system up for about 3h with all jails activated (I started one jail after another, with waiting 1h between starting each jail). After that no access via ssh, no ping, but also no reboot from the sw-watchdog, I had to do a remote power-off/-on. After that I didn't had any crashdump (in the watchdog cases I had dumps, but since I recompiled the kernel since then, I can not provide useful output). The current gmirror status output is at http://www.Leidinger.net/test/gmirror.alcatraz The system has no serial console. I have no physical access. For such a small setup I would expect that 7.2-GENERIC is more than enough. At least 7.1-GENERIC was running without any problem. Does this problem sound familiar to someone, any ideas what to try, anyone with patches I could test? Bye, Alexander. -- I'm not a real movie star -- I've still got the same wife I started out with twenty-eight years ago. -- Will Rogers http://www.Leidinger.net Alexander @ Leidinger.net: PGP ID = B0063FE7 http://www.FreeBSD.org netchild @ FreeBSD.org : PGP ID = 72077137
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