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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