ffs snapshot lockup

[Kostik Belousov]

On Fri, Oct 06, 2006 at 02:11:05PM -0400, Vivek Khera wrote:
> 
> On Oct 6, 2006, at 1:57 PM, Kris Kennaway wrote:
> 
> >>This is very strange. You 3 instances of getty where just reading the
> >>tty input, and all suspectible processes (like sshd) are waiting  
> >>on net
> >>events. No processes are blocked on the fs. One nfsd is serving  
> >>the request,
> >>and dump is active.
> >
> >To repeat something I said earlier: when creating a snapshot
> >(e.g. which dump -L does), the entire system may become unresponsive
> >untilk the snapshot completes, which can take many minutes.
> 
> I know snapshot takes a while -- we're used to that.
> 
> >How long are you waiting before pronouncing the system deadlocked?
> >
> 
> 
> 10's of minutes.
> >What does ^T on the console (e.g. when trying to log in), show you?
> 
There were no active snapshotting in the progress. Snapshot was already
made, and dump happily processed in the moment captured in the script.

> nothing.  the console is non-responsive.  the remote shells are non  
> responsive to any input.
> 
> I'm now convinced it was all stemming from some bug in bge driver (at  
> least for my specific chipset.)  Last night I put in an old spare  
> 3c905 NIC and turned off the motherboard bge via BIOS.
> 
> I can't make the machine lock up at all, even with the watchdog  
> running, and doing level0 dumps.
> 
> Also, even though this NIC is only 10/100 and the prior was running  
> at GigE speed, the system is *way* more responsive to network  
> operations.  For example, when I logged in this morning my IMAP mail  
> client took barely a second or or so to open my inbox, whereas before  
> it would take upwards of 10 seconds.
> 
> This machine was always this way since it was first set up running  
> 5.3.  I can't believe I lived with it for so long...  I'd like to  
> find a nice stable GigE NIC for it, since I know that the onboard bge  
> is definitely sub-optimal with FreeBSD.  Dell's diagnostics don't  
> find any hardware fault, for what that's worth.
> 
> Curiously, I have a handful of other Dell servers at the office which  
> all have bge and run just great at GigE speed to the same switch.
> 
> If it does lock up again, I'll be sure to let you know!
> 
Was this system patched by the stuff I submitted to you ?


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