Date: Fri, 22 Feb 2013 08:47:20 -0800 From: Mark Atkinson <atkin901@gmail.com> To: freebsd-stable@freebsd.org Subject: Re: watchdogs Message-ID: <kg87el$iip$1@ger.gmane.org> In-Reply-To: <512525C1.1070502@norma.perm.ru> References: <512525C1.1070502@norma.perm.ru>
next in thread | previous in thread | raw e-mail | index | archive | help
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 02/20/2013 11:36, Eugene M. Zheganin wrote: > Hi. > > I have a bunch of FreeBSDs that hangs (and I really want to do > something to fight this). May be it's the zfs or may be it's the pf > (I also have a bunch of really stable ones, so it's hard to isolate > and tell). Since 9.x hang more often I suppose it's pf. I use > ichwd.ko and watchdogd to reboot a machine when it hangs. It works > pretty well; I'm also working on a various WITNESS/INVARIANTS stuff > and I'm trying to report it to gnats, but obviously it would be > much nicer if the system would panic and leave some debuggable core > after a hang (so far I don't have any, so I can only guess). I've > read about software watchdog in kernel and I doesn'y quite > understand: it's said that kernel software watchdog is able to > panic when a deadlock occurs. Can this be achieved with ichwd ? > Another one: as far as I understand ichwd reboots my machine on a > hardware level, right ? So am I right saying that software watchdog > can be, in theory, also deadlocked, thus, being kinda less reliable > solution ? I just want to /metoo that I have 32bit/i386 box running zfs, pf and - -current that is hardlocking randomly (usually has an uptime for a few days to a couple weeks). SW_WATCHDOG won't fire when it locks so it must be locking pretty fast. I just noticed that ichwd will load on this box, so I'll try that instead, but now I'm wondering if the SW_WATCHDOG kernel will interfere or rather if watchdogd is smart enough to handle both? This box used to occasionally panic on the ZFS stack panic so I did the KSTACK_PAGES=4 change to the kernel and now it just hardlocks. I'm not saying they are related. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.19 (FreeBSD) Comment: Using GnuPG with undefined - http://www.enigmail.net/ iEYEARECAAYFAlEnoRgACgkQrDN5kXnx8ybJeACbBjpHrQxeZhkjavnoeBgjEJ9W dDUAnipfLgIuUCbM6mk6/bcrl7AphHxC =84T/ -----END PGP SIGNATURE-----
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?kg87el$iip$1>