On 17/03/14 17:59, Karl Pielorz wrote: > > Hi, > > I setup a VM a while ago under XenServer 6.2 - it's an amd64 FBSD 10.0-S > box (based on r261289) - it's running under Xen PVHVM. > > I set it up - and left it for a while (46 days). I went to ssh to it > today, and got: > > " > ssh_exchange_identification: Connection closed by remote host > " > > Getting on to the boxes console there's lots of what look to be 'stuck' > sshd processes? > > 0 3933 895 0 20 0 84868 6944 urdlck Is - 0:00.01 sshd: unknown > [priv] (sshd) > 22 3934 3933 0 20 0 0 0 - Z - 0:00.00 <defunct> > 0 3935 3933 0 20 0 84868 6952 sbwait I - 0:00.00 sshd: unknown > [pam] (sshd) > 0 4338 895 0 20 0 84868 6944 urdlck Is - 0:00.01 sshd: unknown > [priv] (sshd) > 22 4339 4338 0 20 0 0 0 - Z - 0:00.00 <defunct> > > > Anyone know what 'urdlck' is?
It seems like the process is stuck while trying to acquire a rw mutex in read mode. Could you obtain a backtrace of the process with gdb? Also a kernel-space dump might be useful, could you also run procstat -k <pid>? > > There's 126 of these processes, e.g. > > 5446 - I 0:00.00 sshd: unknown [pam] (sshd) > 5450 - Is 0:00.01 sshd: unknown [priv] (sshd) > 5452 - I 0:00.00 sshd: unknown [pam] (sshd) > 5453 - Is 0:00.01 sshd: unknown [priv] (sshd) > > > Bearing in mind the box is firewalled from ssh access, and no one (apart > from me today) has attempted to get onto the box with ssh - this is a > little concerning. Every about 5-10 connects will actually 'connect' - > the rest just result in the 'key exchange' error. > > Kernel is GENERIC with: > > options NO_ADAPTIVE_MUTEXES > options NO_ADAPTIVE_RWLOCKS > options NO_ADAPTIVE_SX > > There's nothing logged in dmesg, or syslog. > > Is there anything worth doing to this VM before I restart it - i.e. to > try and figure out what's happened? / troubleshoot? > > -Karl > > _______________________________________________ > firstname.lastname@example.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-xen > To unsubscribe, send any mail to "freebsd-xen-unsubscr...@freebsd.org" _______________________________________________ email@example.com mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-xen To unsubscribe, send any mail to "freebsd-xen-unsubscr...@freebsd.org"