I booted into single mode, then umounted all unneeded stuff and put / to ro,
stopped all unused raids, ... then did...

quoted text
>    /sbin/halt -f -p
>
> The machine *should* poweroff.

Nope, it didn't and what was curious was that I was left at the bash prompt
:-?

quoted text
> If not, then do the whole thing again with this command:
>
>    strace /bin/halt -f -p

I tried this and I did the strace with a -o to get the output on a remote
cifs fs, here is the full trace:

execve("/sbin/halt", ["/sbin/halt", "-f", "-p"], [/* 16 vars */]) = 0
brk(0)                                  = 0x804b000
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
mmap2(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f29000
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY)      = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=52448, ...}) = 0
mmap2(NULL, 52448, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7f1c000
close(3)                                = 0
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
open("/lib/libc.so.6", O_RDONLY)        = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\260a\1"..., 512) = 512
fstat64(3, {st_mode=S_IFREG|0755, st_size=1335536, ...}) = 0
mmap2(NULL, 1340944, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0xb7dd4000
mmap2(0xb7f16000, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x142) = 0xb7f16000
mmap2(0xb7f19000, 9744, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xb7f19000
close(3)                                = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7dd3000
set_thread_area({entry_number:-1 -> 6, base_addr:0xb7dd36b0, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 0
mprotect(0xb7f16000, 4096, PROT_READ)   = 0
munmap(0xb7f1c000, 52448)               = 0
geteuid32()                             = 0
chdir("/")                              = 0
open("/var/log/wtmp", O_WRONLY|O_APPEND) = -1 EROFS (Read-only file system)
sync()                                  = 0
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigaction(SIGCHLD, NULL, {SIG_DFL}, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
nanosleep({2, 0}, {2, 0})               = 0
reboot(LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, LINUX_REBOOT_CMD_RESTART|0x88888888) = 0
kill(1, SIGTSTP)                        = 0
reboot(LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, LINUX_REBOOT_CMD_POWER_OFF <unfinished ... exit status 0>

Same output on the screen as I commented before, again I got to the shell
and this time I even typed some commands like ps and amazingly they still
worked, even though this was supposed to be halted.

Hope that helps.
-- 
Manty/BestiaTester -> http://manty.net
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