Hiroki Sato wrote: > Hello, > > I have been in a trouble about my NFS server for a long time. The > symptom is that it stops working in one or two weeks after a boot. I > could not track down the cause yet, but it is reproducible and only > occurred under a very high I/O load. > > It did not panic, just stopped working---while it responded to ping, > userland programs seemed not working. I could break it into DDB and > get a kernel dump. The following URLs are a log of ps, trace, and > etc.: > > http://people.allbsd.org/~hrs/FreeBSD/pool.log.20130102 > http://people.allbsd.org/~hrs/FreeBSD/pool.dmesg.20130102 > > Does anyone see how to debug this? I guess this is due to a deadlock > somewhere. I have suffered from this problem for almost two years. > The above log is from stable/9 as of Dec 19, but this have persisted > since 8.X. > Well, I took a quick glance at the log and there are a lot of processes sleeping on "pfault" (in vm_waitpfault() in sys/vm/vm_page.c). I'm no vm guy, so I'm not sure when/why that will happen. The comment on the function suggests they are waiting for free pages.
Maybe something as simple as running out of swap space or a problem talking to the disk(s) that has the swap partition(s) or ??? (I'm talking through my hat here, because I'm not conversant with the vm side of things.) I might take a closer look this evening and see if I can spot anything in the log, rick ps: I hope Alan and Kostik don't mind being added to the cc list. > -- Hiroki _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
