uml 2.4.27-1um lockup at halt/reboot (strace)

One of my machines' guests do not exit properly when "shutdown -h now" is run from the guest. Instead the guest locks up forever and needs a kill -9.

The offending machine runs 2.6.8.10-skas3 host, 2.4.27-1um guest, and is an SMP machine (P4 HT).

xent@um-412:~$ tail -20 dumpy.txt
munmap(0xacbf4000, 4096)                = 0
munmap(0xacbf5000, 4096)                = 0
munmap(0xacbf6000, 4096)                = 0
munmap(0xacbf7000, 4096)                = 0
munmap(0xacbf8000, 4096)                = 0
munmap(0xacbf9000, 4096)                = 0
munmap(0xacbfa000, 4096)                = 0
munmap(0xacbfb000, 4096)                = 0
munmap(0xacbfc000, 4096)                = 0
munmap(0xacbfd000, 4096)                = 0
munmap(0xacbfe000, 4096)                = 0
munmap(0xacbff000, 4096)                = 0
sigreturn()                             = ? (mask now [])
getdents64(16, /* 3 entries */, 4096)   = 72
unlink("/home/xent/.uml/xent/pid")      = 0
getdents64(16, /* 0 entries */, 4096)   = 0
rmdir("/home/xent/.uml/xent")           = 0
kill(1386, SIGKILL)                     = 0
waitpid(1386, NULL, 0)                  = ? ERESTARTSYS (To be restarted)

This was the state of process 1386:

um-412:~# ps ax |grep 1[3]86
 1386 pts/0    T+     0:01 [linux]

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