dump hangs on 7.1

[Len Conrad]

At 11:29 AM 7/10/2009, you wrote:
>FreeBSD 7.1-RELEASE #0: Thu Jan  1 14:37:25 UTC 2009     root at logan.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  i386
>
>CPU: Intel(R) Xeon(R) CPU           E5420  @ 2.50GHz (2496.26-MHz 686-class CPU) 
>  Origin = "GenuineIntel"  Id = 0x1067a  Stepping = 10
>  AMD Features=0x20100000<NX,LM>
>  AMD Features2=0x1<LAHF>
>  Cores per package: 4
>real memory  = 3484745728 (3323 MB)
>avail memory = 3405537280 (3247 MB)
>ACPI APIC Table: <DELL   PE_SC3  >
>FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs
> cpu0 (BSP): APIC ID:  0
> cpu1 (AP): APIC ID:  1
> cpu2 (AP): APIC ID:  2
> cpu3 (AP): APIC ID:  3
>
>
>/sbin/dump -0uanL -f - / | ssh dump_images at xxx.net dd of=/var/ftp/dump_images/mx1-root-test
>
>dump has completed only once. Several other dumps have all gotten under way, target file is created and increases until the hang.  
>
>CTRL-C gets back to shell,eg:
>
>  DUMP: Date of this level 0 dump: Fri Jul 10 10:25:33 2009
>  DUMP: Date of last level 0 dump: the epoch
>  DUMP: Dumping snapshot of /dev/da0s1d (/usr) to standard output
>  DUMP: mapping (Pass I) [regular files]
>  DUMP: mapping (Pass II) [directories]
>  DUMP: estimated 1713942 tape blocks.
>  DUMP: dumping (Pass III) [directories]
>  DUMP: dumping (Pass IV) [regular files]
>^C  DUMP: Interrupt received.
>  DUMP: Do you want to abort dump?: ("yes" or "no") Killed by signal 2.
>  DUMP: Broken pipe
>  DUMP: The ENTIRE dump is aborted.
>
>Hangs always in Pass IV
>
>Plenty of google hits for "dump hang freebsd 7.1" but I can't find one with a solution.
>
>Len

============

More tests:

dump hangs, no errors, see above

dar hangs, no errors.

If, instead of a FreeBSD 7.0 remote target machine, I point dump and dar at a Red Hat Enterprise, then dump and dar don't hang, run to completion.

So it looks like the problem is on FreeBSD 7.0 machine.  

Any suggestions?

thanks
Len