Thread: Zombie and Uninterruptable Sleep Processes

I'm trying to cross-compile 'cvoicecontrol' for my NAS (Synology DS209j, ppc).
Synology Inc. - NEW NAS Experience - Products :: Disk Station DS209j :: Specifications

Everytime I run the binary created from cvoicecontrol.c & cvoicecontrol.h, it freezes and creates 1 zombie process and 3 'D' type processes. Thus requiring a reboot.


Anyone know how I can begin troubleshooting this? Or can anyone take a look at the source?
http://www.kiecza.net/daniel/linux/

or you can get it from most linux package feeds.

Yes, I kill the zombie processes parent, and the PPID becomes '1' as init inherits all orphans. ( or maybe the zombie process's parent was 1 all along?)

There has got to be something with the pthreads coding...I also heard something about pthreads not working on a NAS, although I have checked and I do have libpthreads.so


When this program freezes up , I can't even ctrl+c to get out of it, I have to close the terminal window and start a new one just to run a 'ps aux | grep cvoice'


Maybe the pthreads aren't managed well in the code?

I was able to capture this with gdb

Program received signal SIG32, Real-time event 32.
0x0ff0183c in ?? () from /opt/lib/libpthread.so.0

ok i guess gdb doesn't handle threads real well so I passed it this:

(gdb) handle SIG32 nostop noprint pass



and then got this:

Starting program: /usr/local/bin/cvoicecontrol --once hello.cvc
[New LWP 20573]

Program received signal SIGSEGV, Segmentation fault.
[Switching to LWP 20573]
0x0fe161b8 in free () from /lib/libc.so.6


(gdb) bt
#0 0x0fe161b8 in free () from /lib/libc.so.6
#1 0x1000a38c in preprocess ()
#2 0x0fefef6c in ?? () from /opt/lib/libpthread.so.0
#3 0x0fe79bc0 in clone () from /lib/libc.so.6
Backtrace stopped: previous frame inner to this frame (corrupt stack?)

ahh I learned how to compile with -g..big help!!

now I see this:

Program received signal SIGSEGV, Segmentation fault.
[Switching to LWP 23404]
0x1000a4b4 in preprocess () at cvoicecontrol.c:1129
1129
(gdb) bt
#0 0x1000a4b4 in preprocess () at cvoicecontrol.c:1129
#1 0x0fefef6c in ?? () from /opt/lib/libpthread.so.0
#2 0x0fe79bc0 in clone () from /lib/libc.so.6
Backtrace stopped: previous frame inner to this frame (corrupt stack?)




Line 1129:
frame[i] = ((float)((signed short)(buffer[frameI*OFFSET+2*i]|(buffer[frameI*OFFSET+2*i+1]<<8)))) *


does this mean anything?


Or when I list within gdb:

(gdb) list cvoicecontrol.c:1129
1124 /***** prepare a hamming windowed frame from the audio data ... */
1125
1126 for (i = 0; i < FFT_SIZE; i++)
1127 frame[i] = ((float)((signed short)(buffer[frameI*OFFSET+2*i]|(buffer[frameI*OFFSET+2*i+1]<<8)))) *
1128 hamming_window[i];
1129
1130 preprocessFrame(frame, feat_vector); /* ... and have it preprocessed */
1131
1132 /***** put the resulting feature vector in queue2 using the proper status flag*/
1133