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Prevent a potential race when stopping containers

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If sending a signal fails, check if the container is alive. If it
is not, it probably stopped on its own before we could send the
signal, so don't error out.

Signed-off-by: Matthew Heon <matthew.heon@gmail.com>

Closes: #591
Approved by: rhatdan
This commit is contained in:
Matthew Heon
2018-04-03 18:24:54 -04:00
committed by Atomic Bot
parent 35a10c9ba5
commit eb0d5dfff1
1 changed files with 15 additions and 0 deletions
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15
libpod/oci.go
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@ -467,6 +467,15 @@ func (r *OCIRuntime) stopContainer(ctr *Container, timeout uint) error {
if timeout > 0 {
if err := r.killContainer(ctr, stopSignal); err != nil {
// Is the container gone?
// If so, it probably died between the first check and
// our sending the signal
// The container is stopped, so exit cleanly
err := unix.Kill(ctr.state.PID, 0)
if err == unix.ESRCH {
return nil
}
return err
}
@ -479,6 +488,12 @@ func (r *OCIRuntime) stopContainer(ctr *Container, timeout uint) error {
}
if err := utils.ExecCmdWithStdStreams(os.Stdin, os.Stdout, os.Stderr, r.path, "kill", "--all", ctr.ID(), "KILL"); err != nil {
// Again, check if the container is gone. If it is, exit cleanly.
err := unix.Kill(ctr.state.PID, 0)
if err == unix.ESRCH {
return nil
}
return errors.Wrapf(err, "error sending SIGKILL to container %s", ctr.ID())
}