Memory corruption on socket.gethostbyname_ex
Hi, There are some memory corruption while calling socket.gethostbyname_ex from the thread while other thread executes JIT'ed code: In such case socket.gethostbyname_ex returns random entries from /etc/hosts instead of DNS lookup. ------ import sys import socket import threading domain = 'google.com' def lookup(x): res = socket.gethostbyname_ex(x) if res[0] != 'google.com': print 'BUG: resolve %s -> %s' % (x, res) sys.stdout.flush() def test(): # do some JIT for i in xrange(1000000000): pass for i in range(100): th = threading.Thread(target=lookup, args=[domain]) th.start() th = threading.Thread(target=test) th.start() print 'startup done' ------ Affected versions: PyPy 1.8, 1.9, 2.0b1 on Linux (Fedora 16, Debian GNU/Linux 6.0) --- Python 2.7.3 (07e08e9c885ca67d89bcc304e45a32346daea2fa, Mar 19 2013, 07:39:19) [PyPy 2.0.0-beta1 with GCC 4.4.5] on linux2 Python 2.7.3 (07e08e9c885ca67d89bcc304e45a32346daea2fa, Dec 18 2012, 05:33:54) [PyPy 2.0.0-beta1 with GCC 4.6.3] on linux2 Python 2.7.2 (2346207d99463f299f09f3e151c9d5fa9158f71b, May 15 2012, 11:08:08) [PyPy 1.8.0 with GCC 4.6.3] on linux2 Python 2.7.2 (341e1e3821fff77db3bb5cdb7a4851626298c44e, Oct 23 2012, 11:37:42) [PyPy 1.9.0 with GCC 4.6.3] on linux2 --- Not affected: PyPy 2.0b1 on MacOSX --- Python 2.7.3 (07e08e9c885ca67d89bcc304e45a32346daea2fa, Mar 19 2013, 07:52:27) [PyPy 2.0.0-beta1] on darwin Python 2.7.3 (7e4f0faa3d51, Nov 21 2012, 15:59:46) [PyPy 2.0.0-beta1 with GCC 4.2.1] on darwin ---
Hi, 2013/3/22 Vasily Evseenko <svpcom@gmail.com>
Hi,
There are some memory corruption while calling socket.gethostbyname_ex from the thread while other thread executes JIT'ed code: In such case socket.gethostbyname_ex returns random entries from /etc/hosts instead of DNS lookup.
Please file a bug on https://bugs.pypy.org/ Some notes: - it reproduces even without a JIT-enabled pypy - PyPy uses gethostbyname() instead of gethostbyname_r()
------ import sys import socket import threading
domain = 'google.com'
def lookup(x): res = socket.gethostbyname_ex(x) if res[0] != 'google.com': print 'BUG: resolve %s -> %s' % (x, res) sys.stdout.flush()
def test(): # do some JIT for i in xrange(1000000000): pass
for i in range(100): th = threading.Thread(target=lookup, args=[domain]) th.start()
th = threading.Thread(target=test) th.start()
print 'startup done' ------
Affected versions: PyPy 1.8, 1.9, 2.0b1 on Linux (Fedora 16, Debian GNU/Linux 6.0) --- Python 2.7.3 (07e08e9c885ca67d89bcc304e45a32346daea2fa, Mar 19 2013, 07:39:19) [PyPy 2.0.0-beta1 with GCC 4.4.5] on linux2
Python 2.7.3 (07e08e9c885ca67d89bcc304e45a32346daea2fa, Dec 18 2012, 05:33:54) [PyPy 2.0.0-beta1 with GCC 4.6.3] on linux2
Python 2.7.2 (2346207d99463f299f09f3e151c9d5fa9158f71b, May 15 2012, 11:08:08) [PyPy 1.8.0 with GCC 4.6.3] on linux2
Python 2.7.2 (341e1e3821fff77db3bb5cdb7a4851626298c44e, Oct 23 2012, 11:37:42) [PyPy 1.9.0 with GCC 4.6.3] on linux2 ---
Not affected: PyPy 2.0b1 on MacOSX --- Python 2.7.3 (07e08e9c885ca67d89bcc304e45a32346daea2fa, Mar 19 2013, 07:52:27) [PyPy 2.0.0-beta1] on darwin
Python 2.7.3 (7e4f0faa3d51, Nov 21 2012, 15:59:46) [PyPy 2.0.0-beta1 with GCC 4.2.1] on darwin ---
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-- Amaury Forgeot d'Arc
participants (2)
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Amaury Forgeot d'Arc -
Vasily Evseenko