New submission from l4mer <janusz.dzied...@gmail.com>:
I am using ssh mux + authorized key. So can exectute commands without passwod.
1. disconnect mux by: ssh user@localhost -O exit
2. run simple script
import subprocess
if __name__ == '__main__':
cmd = ["ssh", "user@localhost", "id"]
try:
buf = subprocess.check_output(cmd, stderr=subprocess.STDOUT)
except subprocess.CalledProcessError as e:
buf = e.output
3. This always hang in read(3,
fcntl(3, F_GETFL) = 0 (flags O_RDONLY)
fstat(3, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x7f036b5f1000
lseek(3, 0, SEEK_CUR) = -1 ESPIPE (Illegal seek)
fstat(3, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
munmap(0x7f036b5f1000, 4096) = 0
fstat(3, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
lseek(3, 0, SEEK_CUR) = -1 ESPIPE (Illegal seek)
read(3, "uid=0(", 6) = 6
fstat(3, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
lseek(3, 0, SEEK_CUR) = -1 ESPIPE (Illegal seek)
read(3, "root) ", 6) = 6
fstat(3, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
lseek(3, 0, SEEK_CUR) = -1 ESPIPE (Illegal seek)
read(3, "gid=0(r", 7) = 7
fstat(3, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
lseek(3, 0, SEEK_CUR) = -1 ESPIPE (Illegal seek)
read(3, "oot) gro", 8) = 8
fstat(3, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
lseek(3, 0, SEEK_CUR) = -1 ESPIPE (Illegal seek)
read(3, "ups=0(roo", 9) = 9
fstat(3, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
lseek(3, 0, SEEK_CUR) = -1 ESPIPE (Illegal seek)
read(3, "t)\n", 10) = 3
read(3, 0x7f036b480653, 7) = ? ERESTARTSYS (To be restarted if
SA_RESTART is set)
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=21620, si_status=0,
si_utime=1, si_stime=0} ---
read(3,
4. After ctr+c
read(3, ^CProcess 21619 detached
<detached ...>
Traceback (most recent call last):
File "test.py", line 6, in <module>
buf = subprocess.check_output(cmd, stderr=subprocess.STDOUT)
File "/usr/lib/python2.7/subprocess.py", line 567, in check_output
output, unused_err = process.communicate()
File "/usr/lib/python2.7/subprocess.py", line 791, in communicate
wigig@wigig-Latitude-E5270:~$ stdout = _eintr_retry_call(self.stdout.read)
File "/usr/lib/python2.7/subprocess.py", line 476, in _eintr_retry_call
return func(*args)
BTW, when MUX is created it always works.
----------
messages: 303815
nosy: l4mer
priority: normal
severity: normal
status: open
title: subprocess with stderr=subprocess.STDOUT hang
type: behavior
versions: Python 2.7
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue31712>
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