In logs of my pylons app I spotted recently a few backtraces like the
one below. Not sure whether this is harmful, but maybe it is worth 
a look?


2009-09-10_06:08:37.07570 08:08:37,075 WARNI [paste.httpserver.ThreadPool] 
Thread 47284430936400 hung (working on task for 9610 seconds)
2009-09-10_06:08:37.08774   File "/usr/lib/python2.6/SocketServer.py", line 
281, in _handle_request_noblock
2009-09-10_06:08:37.08774 Traceback (most recent call last):
2009-09-10_06:08:37.08775     self.process_request(request, client_address)
2009-09-10_06:08:37.08776     lambda: self.process_request_in_thread(request, 
client_address))
2009-09-10_06:08:37.08776   File 
"/var/lib/python-support/python2.6/paste/httpserver.py", line 1046, in 
process_request
2009-09-10_06:08:37.08777     self.kill_hung_threads()
2009-09-10_06:08:37.08777   File 
"/var/lib/python-support/python2.6/paste/httpserver.py", line 626, in add_task
2009-09-10_06:08:37.08778     self.kill_worker(worker.thread_id)
2009-09-10_06:08:37.08778   File 
"/var/lib/python-support/python2.6/paste/httpserver.py", line 787, in 
kill_hung_threads
2009-09-10_06:08:37.08779     killthread.async_raise(thread_id, SystemExit)
2009-09-10_06:08:37.08779   File 
"/var/lib/python-support/python2.6/paste/httpserver.py", line 714, in 
kill_worker
2009-09-10_06:08:37.08780   File 
"/var/lib/python-support/python2.6/paste/util/killthread.py", line 25, in 
async_raise
2009-09-10_06:08:37.09506     raise ValueError("invalid thread id")
2009-09-10_06:08:37.09514 ValueError: invalid thread id
2009-09-10_06:33:04.99899 08:33:04,998 WARNI [paste.httpserver.ThreadPool] 
Thread 47284430936400 hung (working on task for 11077 seconds)
2009-09-10_06:33:04.99903 Traceback (most recent call last):
2009-09-10_06:33:04.99904     self.process_request(request, client_address)
2009-09-10_06:33:04.99904   File "/usr/lib/python2.6/SocketServer.py", line 
281, in _handle_request_noblock
2009-09-10_06:33:04.99905     lambda: self.process_request_in_thread(request, 
client_address))
2009-09-10_06:33:04.99905   File 
"/var/lib/python-support/python2.6/paste/httpserver.py", line 1046, in 
process_request
2009-09-10_06:33:04.99906   File 
"/var/lib/python-support/python2.6/paste/httpserver.py", line 626, in add_task
2009-09-10_06:33:04.99907     self.kill_hung_threads()
2009-09-10_06:33:04.99907   File 
"/var/lib/python-support/python2.6/paste/httpserver.py", line 787, in 
kill_hung_threads
2009-09-10_06:33:04.99908     self.kill_worker(worker.thread_id)
2009-09-10_06:33:04.99908   File 
"/var/lib/python-support/python2.6/paste/httpserver.py", line 714, in 
kill_worker
2009-09-10_06:33:04.99909     killthread.async_raise(thread_id, SystemExit)
2009-09-10_06:33:04.99909   File 
"/var/lib/python-support/python2.6/paste/util/killthread.py", line 25, in 
async_raise
2009-09-10_06:33:04.99910     raise ValueError("invalid thread id")
2009-09-10_06:33:04.99910 ValueError: invalid thread id
2009-09-10_06:54:04.24218 08:54:04,241 WARNI [paste.httpserver.ThreadPool] 
Thread 47284430936400 hung (working on task for 12337 seconds)
2009-09-10_06:54:04.24220 Traceback (most recent call last):
2009-09-10_06:54:04.24221     self.process_request(request, client_address)
2009-09-10_06:54:04.24221   File "/usr/lib/python2.6/SocketServer.py", line 
281, in _handle_request_noblock
2009-09-10_06:54:04.24222     lambda: self.process_request_in_thread(request, 
client_address))
2009-09-10_06:54:04.24222   File 
"/var/lib/python-support/python2.6/paste/httpserver.py", line 1046, in 
process_request
2009-09-10_06:54:04.24223   File 
"/var/lib/python-support/python2.6/paste/httpserver.py", line 626, in add_task
2009-09-10_06:54:04.24224     self.kill_hung_threads()
2009-09-10_06:54:04.24224   File 
"/var/lib/python-support/python2.6/paste/httpserver.py", line 787, in 
kill_hung_threads
2009-09-10_06:54:04.24225     self.kill_worker(worker.thread_id)
2009-09-10_06:54:04.24225   File 
"/var/lib/python-support/python2.6/paste/httpserver.py", line 714, in 
kill_worker
2009-09-10_06:54:04.24226     killthread.async_raise(thread_id, SystemExit)
2009-09-10_06:54:04.26135     raise ValueError("invalid thread id")
2009-09-10_06:54:04.26135   File 
"/var/lib/python-support/python2.6/paste/util/killthread.py", line 25, in 
async_raise
2009-09-10_06:54:04.26136 ValueError: invalid thread id


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