https://bugzilla.redhat.com/show_bug.cgi?id=1096273
Bug ID: 1096273
Summary: repetition of signal 21 with --sig-proxy and SIGSTOP
of docker
Product: Red Hat Enterprise Linux 7
Version: 7.1
Component: docker
Severity: low
Assignee: [email protected]
Reporter: [email protected]
QA Contact: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected],
[email protected], [email protected],
[email protected]
Depends On: 1087704
+++ This bug was initially created as a clone of Bug #1087704 +++
Description of problem:
I noticed weird reaction to SIGSTOP signal. When you start container with
--sig-proxy, ignore all signals in container and from OS use kill -SIGSTOP to
the `docker run` process, it's put into background. (so far correct behavior)
Than when you use kill -SIGCONT, it's resumed (still in background) and it's
continuing to send signal 21 to the container (100% CPU utilization).
This disappears once you attach the process with fg.
Version-Release number of selected component (if applicable):
docker-0.10.0-8.el7.x86_64
docker-io-0.9.1-1.fc21.x86_64
How reproducible:
always
Steps to Reproduce:
1. /usr/bin/docker -D run --tty=false --rm -i --name test_eoly
localhost:5000/ldoktor/fedora:latest bash -c 'for NUM in `seq 1 64`; do trap
"echo Received $NUM, ignoring..." $NUM; done; while :; do sleep 1; done'
2. ps ax |grep docker
3. kill -SIGSTOP $PID
4. kill -SIGCONT $PID
Actual results:
[1]+ Pozastavena /usr/bin/docker -D run --tty=false --rm -i --name
test_eoly localhost:5000/ldoktor/fedora:latest bash -c 'for NUM in `seq 1 64`;
do trap "echo Received $NUM, ignoring..." $NUM; done; while :; do sleep 1;
done'
[root@t530 ~]# Received 21, ignoring...
Received 21, ignoring...
Received 21, ignoring...
Received 21, ignoring...
Received 21, ignoring...
Received 21, ignoring...
... (100% CPU utilization, when you use fg it stops and you can use the
container again...)
Expected results:
[1]+ Pozastavena /usr/bin/docker -D run --tty=false --rm -i --name
test_eoly localhost:5000/ldoktor/fedora:latest bash -c 'for NUM in `seq 1 64`;
do trap "echo Received $NUM, ignoring..." $NUM; done; while :; do sleep 1;
done'
[root@t530 ~]# Received 21, ignoring...
Additional info:
I'm not definitely sure if this is really required as it's not a common usage.
But as there is no way to detach the process apart from kill -SIGSTOP people
might use it and get to this problem...
--- Additional comment from Lukas Doktor on 2014-05-05 03:59:30 EDT ---
I retested this with the upstream dc9c28f/0.10.0 with the same results. The
daemon output is:
...
[/home/medic/Work/Projekty/Docker/root|fa3816b6] -job
kill(b01a849cb45ebe94c3a61fa021a5464186345d5b159faee4ea9d5da39fb36de5, TTIN) =
OK (0)
2014/05/05 09:58:13 POST
/v1.10/containers/b01a849cb45ebe94c3a61fa021a5464186345d5b159faee4ea9d5da39fb36de5/kill?signal=TTIN
[/home/medic/Work/Projekty/Docker/root|fa3816b6] +job
kill(b01a849cb45ebe94c3a61fa021a5464186345d5b159faee4ea9d5da39fb36de5, TTIN)
[/home/medic/Work/Projekty/Docker/root|fa3816b6] -job
kill(b01a849cb45ebe94c3a61fa021a5464186345d5b159faee4ea9d5da39fb36de5, TTIN) =
OK (0)
2014/05/05 09:58:13 POST
/v1.10/containers/b01a849cb45ebe94c3a61fa021a5464186345d5b159faee4ea9d5da39fb36de5/kill?signal=TTIN
[/home/medic/Work/Projekty/Docker/root|fa3816b6] +job
kill(b01a849cb45ebe94c3a61fa021a5464186345d5b159faee4ea9d5da39fb36de5, TTIN)
[/home/medic/Work/Projekty/Docker/root|fa3816b6] -job
kill(b01a849cb45ebe94c3a61fa021a5464186345d5b159faee4ea9d5da39fb36de5, TTIN) =
OK (0)
2014/05/05 09:58:13 POST
/v1.10/containers/b01a849cb45ebe94c3a61fa021a5464186345d5b159faee4ea9d5da39fb36de5/kill?signal=TTIN
[/home/medic/Work/Projekty/Docker/root|fa3816b6] +job
kill(b01a849cb45ebe94c3a61fa021a5464186345d5b159faee4ea9d5da39fb36de5, TTIN)
...
Referenced Bugs:
https://bugzilla.redhat.com/show_bug.cgi?id=1087704
[Bug 1087704] repetition of signal 21 with --sig-proxy and SIGSTOP of
docker
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