Date: Thu, 21 Feb 2013 01:36:33 +0600 From: "Eugene M. Zheganin" <emz@norma.perm.ru> To: freebsd-stable@freebsd.org Subject: watchdogs Message-ID: <512525C1.1070502@norma.perm.ru>
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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 ? Thanks. Eugene.
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