https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221700
Bug ID: 221700
Summary: lang/python: subprocess does not use closefrom, calls
close(2) hundreds of thousands of times
Product: Ports & Packages
Version: Latest
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: Individual Port(s)
Assignee: pyt...@freebsd.org
Reporter: ema...@freebsd.org
Blocks: 221696
Assignee: pyt...@freebsd.org
Flags: maintainer-feedback?(pyt...@freebsd.org)
% python --version
Python 2.7.13
% pkg info python | grep Version
Version : 2.7_3,2
% ktrace -i python -c 'import subprocess; subprocess.call("/usr/bin/true",
close_fds=True);'
% kdump -s | egrep -c 'CALL.*close'
939647
excerpt from kdump:
1958 python2.7 CALL close(0x3)
1958 python2.7 RET close -1 errno 9 Bad file descriptor
1958 python2.7 CALL close(0x5)
1958 python2.7 RET close -1 errno 9 Bad file descriptor
1958 python2.7 CALL close(0x6)
1958 python2.7 RET close -1 errno 9 Bad file descriptor
1958 python2.7 CALL close(0x7)
1958 python2.7 RET close -1 errno 9 Bad file descriptor
1958 python2.7 CALL close(0x8)
1958 python2.7 RET close -1 errno 9 Bad file descriptor
1958 python2.7 CALL close(0x9)
1958 python2.7 RET close -1 errno 9 Bad file descriptor
...
1958 python2.7 CALL close(0xe5628)
1958 python2.7 RET close -1 errno 9 Bad file descriptor
1958 python2.7 CALL close(0xe5629)
1958 python2.7 RET close -1 errno 9 Bad file descriptor
1958 python2.7 CALL close(0xe562a)
1958 python2.7 RET close -1 errno 9 Bad file descriptor
1958 python2.7 CALL close(0xe562b)
1958 python2.7 RET close -1 errno 9 Bad file descriptor
This has both a performance impact and an impact on the ability to debug
problems with python programs.
Referenced Bugs:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221696
[Bug 221696] sysutils/py-diffoscope: Tests run significantly slower on FreeBSD
than on other platforms
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