On Tue, Mar 9, 2010 at 12:03 PM, Florian Forster <o...@verplant.org> wrote:
> Hi again,
>
> On Tue, Mar 09, 2010 at 11:46:20AM -0800, Ryan Tomayko wrote:
>> # lsof -p 25335
>> […]
>> collectd 25335 root 0r FIFO 0,6 1285434092 pipe
>> collectd 25335 root 1w FIFO 0,6 1285434093 pipe
>> collectd 25335 root 2w FIFO 0,6 1285434094 pipe
>>
>> Not much useful in there that I can see.
>
> actually, this proves that this is in fact the forked child. Since the
> network socket is not open, it means that the filehandles (except the
> standard ones) have been closed and the pipes have been dup'ed to
> standard input, output and error.
>
> The next interesting bit would be the content of "/proc/$PID/status" for
> such a weird child. Maybe the signal mask or UID/GID can tell me which
> step would be the next and might be the failing one.
You got it:
# cat /proc/25335/status
Name: collectd
State: S (sleeping)
Tgid: 25335
Pid: 25335
PPid: 19346
TracerPid: 0
Uid: 0 0 0 0
Gid: 0 0 0 0
FDSize: 64
Groups: 0
VmPeak: 227240 kB
VmSize: 227240 kB
VmLck: 0 kB
VmHWM: 796 kB
VmRSS: 796 kB
VmData: 188820 kB
VmStk: 84 kB
VmExe: 148 kB
VmLib: 2264 kB
VmPTE: 128 kB
Threads: 1
SigQ: 0/139264
SigPnd: 0000000000000000
ShdPnd: 0000000000000000
SigBlk: 0000000000000000
SigIgn: 0000000000001000
SigCgt: 0000000180014202
CapInh: 0000000000000000
CapPrm: ffffffffffffffff
CapEff: ffffffffffffffff
CapBnd: ffffffffffffffff
Cpus_allowed: 000000ff
Cpus_allowed_list: 0-7
Mems_allowed: 00000000,00000001
Mems_allowed_list: 0
voluntary_ctxt_switches: 1
nonvoluntary_ctxt_switches: 0
Here's the process hierarchy for that guy for context (25335 will
orphan and hang around when I restart with the init.d script):
# pstree -apu 19346
collectd,19346 -C /etc/collectd/collectd.conf -f
├─collectd,25335 -C /etc/collectd/collectd.conf -f
├─collectd,29459 -C /etc/collectd/collectd.conf -f
├─{collectd},19347
├─{collectd},19348
├─{collectd},19349
├─{collectd},19350
├─{collectd},19351
├─{collectd},25334
└─{collectd},29458
>> I'll give that a shot. Thanks a ton for all your help here.
>
> You're welcome ;) I'm astonished again and again how hard forking a
> process "right" actually is ;)
Indeed. Definitely plenty of rope there. Still, I love it :)
Thanks,
Ryan
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