Message 313899 - Python tracker

➜

This issue tracker has been migrated to GitHub, and is currently read-only.
For more information, see the GitHub FAQs in the Python's Developer Guide.

Author	Henrique Andrade
Recipients	Henrique Andrade
Date	2018-03-15.18:05:16
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<[email protected]>
In-reply-to

Content
A simple example like such demonstrates that one of the file descriptors associated with the underlying pipe will be leaked: >>> from multiprocessing.queues import Queue >>> x = Queue() >>> x.close() Right after the queue is created we get (assuming the Python interpreter is associated with pid 8096 below): > ll /proc/8096/fd total 0 dr-x------ 2 hcma hcma 0 2018-03-15 14:03:23.210089578 -0400 . dr-xr-xr-x 9 hcma hcma 0 2018-03-15 14:03:23.190089760 -0400 .. lrwx------ 1 hcma hcma 64 2018-03-15 14:03:33.145998954 -0400 0 -> /dev/pts/25 lrwx------ 1 hcma hcma 64 2018-03-15 14:03:33.145998954 -0400 1 -> /dev/pts/25 lrwx------ 1 hcma hcma 64 2018-03-15 14:03:23.210089578 -0400 2 -> /dev/pts/25 lr-x------ 1 hcma hcma 64 2018-03-15 14:03:33.145998954 -0400 3 -> pipe:[44076946] l-wx------ 1 hcma hcma 64 2018-03-15 14:03:33.145998954 -0400 4 -> pipe:[44076946] lr-x------ 1 hcma hcma 64 2018-03-15 14:03:33.145998954 -0400 5 -> /dev/urandom After close(): > ll /proc/8096/fd total 0 dr-x------ 2 hcma hcma 0 2018-03-15 14:03:23.210089578 -0400 . dr-xr-xr-x 9 hcma hcma 0 2018-03-15 14:03:23.190089760 -0400 .. lrwx------ 1 hcma hcma 64 2018-03-15 14:03:33.145998954 -0400 0 -> /dev/pts/25 lrwx------ 1 hcma hcma 64 2018-03-15 14:03:33.145998954 -0400 1 -> /dev/pts/25 lrwx------ 1 hcma hcma 64 2018-03-15 14:03:23.210089578 -0400 2 -> /dev/pts/25 lr-x------ 1 hcma hcma 64 2018-03-15 14:03:33.145998954 -0400 3 -> pipe:[44076946] l-wx------ 1 hcma hcma 64 2018-03-15 14:03:33.145998954 -0400 4 -> pipe:[44076946] lr-x------ 1 hcma hcma 64 2018-03-15 14:03:33.145998954 -0400 5 -> /dev/urandom

A simple example like such demonstrates that one of the file descriptors associated with the underlying pipe will be leaked:

>>> from multiprocessing.queues import Queue
>>> x = Queue()
>>> x.close()

Right after the queue is created we get (assuming the Python interpreter is associated with pid 8096 below):

> ll /proc/8096/fd
total 0
dr-x------ 2 hcma hcma  0 2018-03-15 14:03:23.210089578 -0400 .
dr-xr-xr-x 9 hcma hcma  0 2018-03-15 14:03:23.190089760 -0400 ..
lrwx------ 1 hcma hcma 64 2018-03-15 14:03:33.145998954 -0400 0 -> /dev/pts/25
lrwx------ 1 hcma hcma 64 2018-03-15 14:03:33.145998954 -0400 1 -> /dev/pts/25
lrwx------ 1 hcma hcma 64 2018-03-15 14:03:23.210089578 -0400 2 -> /dev/pts/25
lr-x------ 1 hcma hcma 64 2018-03-15 14:03:33.145998954 -0400 3 -> pipe:[44076946]
l-wx------ 1 hcma hcma 64 2018-03-15 14:03:33.145998954 -0400 4 -> pipe:[44076946]
lr-x------ 1 hcma hcma 64 2018-03-15 14:03:33.145998954 -0400 5 -> /dev/urandom

After close():

> ll /proc/8096/fd
total 0
dr-x------ 2 hcma hcma  0 2018-03-15 14:03:23.210089578 -0400 .
dr-xr-xr-x 9 hcma hcma  0 2018-03-15 14:03:23.190089760 -0400 ..
lrwx------ 1 hcma hcma 64 2018-03-15 14:03:33.145998954 -0400 0 -> /dev/pts/25
lrwx------ 1 hcma hcma 64 2018-03-15 14:03:33.145998954 -0400 1 -> /dev/pts/25
lrwx------ 1 hcma hcma 64 2018-03-15 14:03:23.210089578 -0400 2 -> /dev/pts/25
lr-x------ 1 hcma hcma 64 2018-03-15 14:03:33.145998954 -0400 3 -> pipe:[44076946]
l-wx------ 1 hcma hcma 64 2018-03-15 14:03:33.145998954 -0400 4 -> pipe:[44076946]
lr-x------ 1 hcma hcma 64 2018-03-15 14:03:33.145998954 -0400 5 -> /dev/urandom

History
Date	User	Action	Args
2018-03-15 18:05:17	Henrique Andrade	set	recipients: + Henrique Andrade
2018-03-15 18:05:17	Henrique Andrade	set	messageid: <[email protected]>
2018-03-15 18:05:17	Henrique Andrade	link	issue33081 messages
2018-03-15 18:05:16	Henrique Andrade	create