Bug#442189: (infinite(?) loop during update, possible race condition)

[Vincent McIntyre <Vince.McIntyre@atnf.CSIRO.AU>]

I forgot to list the other stuck processes:

# ps -fade|grep apt
root     18380 18327  0 Nov14 ?        00:00:00 /usr/bin/apt-get update
root     18382 18380  0 Nov14 ?        00:00:00 /usr/lib/apt/methods/http
root     18384 18380  0 Nov14 ?        00:00:00 /usr/lib/apt/methods/gpgv
root     18389 18380  0 Nov14 ?        00:00:00 /usr/lib/apt/methods/bzip2
root     18409 18380  0 Nov14 ?        00:00:00 /usr/lib/apt/methods/gzip

and then I thought let's just check....

# strace -s 2048 -f -p 18380
Process 18380 attached - interrupt to quit
select(10, [5 6 7 9], [], NULL, {0, 468000}) = 0 (Timeout)
stat64("/var/lib/apt/lists/partial/debian-archive:9999_atnf_dists_etch_main_binary-i386_Packages.decomp", 
{st_mode=S_IFREG|0644, st_size=0, ...}) = 0
select(10, [5 6 7 9], [], NULL, {0, 500000}) = 0 (Timeout)
stat64("/var/lib/apt/lists/partial/debian-archive:9999_atnf_dists_etch_main_binary-i386_Packages.decomp", 
{st_mode=S_IFREG|0644, st_size=0, ...}) = 0
select(10, [5 6 7 9], [], NULL, {0, 500000}) = 0 (Timeout)
stat64("/var/lib/apt/lists/partial/debian-archive:9999_atnf_dists_etch_main_binary-i386_Packages.decomp", 
{st_mode=S_IFREG|0644, st_size=0, ...}) = 0
select(10, [5 6 7 9], [], NULL, {0, 500000} <unfinished ...>
Process 18380 detached

aha. It's stuck trying to get the proxied versions of our local repo's 
Packages file. Maybe Joey's on to something.


the other child processes are stuck too.

# strace -s 2048 -f -p 18382
Process 18382 attached - interrupt to quit
select(1, [0], NULL, NULL, NULL <unfinished ...>
Process 18382 detached

# strace -s 2048 -f -p 18389
Process 18389 attached - interrupt to quit
select(1, [0], NULL, NULL, NULL <unfinished ...>
Process 18389 detached

I have in fact having some problems with apt-proxy noticing that the
local package repo has new packages. I end up having to go and delete
the relevant Packages.gz in the apt-proxy cache directories.

Possibly the problem is that we aren't using pdiffs in our repo?
On the test machine /etc/apt/apt.conf has them turned off -
   Acquire {
     Pdiffs                "false";
   };
so I'm at a bit of a loss why apt would even ask for a Packages.decomp.
Or maybe I'm just misunderstanding this.