Merge to M59: Linux sandbox: handle ENOSPC clone failure

Merge to M59: Linux sandbox: handle ENOSPC clone failure

> Linux 4.9 adds /proc/sys/user/max_user_namespaces to limit the number
> of concurrent user namespaces.  Sometimes the limit is set to 0 in
> which case clone() will return ENOSPC.  This CL avoids PCHECK()ing in
> that case.
>
> BUG=715138
> R=mdempsky@chromium.org
>
> Review-Url: https://codereview.chromium.org/2842033002
> Cr-Commit-Position: refs/heads/master@{#467271}

BUG=715138
TBR=mdempsky@chromium.org
NOPRESUBMIT=true
NOTRY=true

Review-Url: https://codereview.chromium.org/2852503003
Cr-Commit-Position: refs/branch-heads/3071@{#269}
Cr-Branched-From: a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed: https://chromium.googlesource.com/chromium/src/+/788c0bc6e3cdd9fff69ebb0ac48b01dd0370a76a

[Tom Anderson, 2017-04-27 20:55:08]

Description was changed from

==========
Linux sandbox: handle ENOSPC clone failure

> Linux 4.9 adds /proc/sys/user/max_user_namespaces to limit the number
> of concurrent user namespaces.  Sometimes the limit is set to 0 in
> which case clone() will return ENOSPC.  This CL avoids PCHECK()ing in
> that case.
>
> BUG=715138
> R=mdempsky@chromium.org
>
> Review-Url: https://codereview.chromium.org/2842033002
> Cr-Commit-Position: refs/heads/master@{#467271}

BUG=715138
TBR=mdempsky@chromium.org
NOPRESUBMIT=true
NOTRY=true
==========

to

==========
Merge to M59: Linux sandbox: handle ENOSPC clone failure

> Linux 4.9 adds /proc/sys/user/max_user_namespaces to limit the number
> of concurrent user namespaces.  Sometimes the limit is set to 0 in
> which case clone() will return ENOSPC.  This CL avoids PCHECK()ing in
> that case.
>
> BUG=715138
> R=mdempsky@chromium.org
>
> Review-Url: https://codereview.chromium.org/2842033002
> Cr-Commit-Position: refs/heads/master@{#467271}

BUG=715138
TBR=mdempsky@chromium.org
NOPRESUBMIT=true
NOTRY=true
==========

[Tom Anderson, 2017-04-27 20:55:19]

The CQ bit was checked by thomasanderson@chromium.org

[commit-bot: I haz the power, 2017-04-27 20:55:51]

CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-04-27 20:56:44]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1493326519876040, "parent_rev":
"2f98d49a31499adb3e681db0b0e5a5e26c0fdc40", "commit_rev":
"788c0bc6e3cdd9fff69ebb0ac48b01dd0370a76a"}

[commit-bot: I haz the power, 2017-04-27 20:56:52]

Description was changed from

==========
Merge to M59: Linux sandbox: handle ENOSPC clone failure

> Linux 4.9 adds /proc/sys/user/max_user_namespaces to limit the number
> of concurrent user namespaces.  Sometimes the limit is set to 0 in
> which case clone() will return ENOSPC.  This CL avoids PCHECK()ing in
> that case.
>
> BUG=715138
> R=mdempsky@chromium.org
>
> Review-Url: https://codereview.chromium.org/2842033002
> Cr-Commit-Position: refs/heads/master@{#467271}

BUG=715138
TBR=mdempsky@chromium.org
NOPRESUBMIT=true
NOTRY=true
==========

to

==========
Merge to M59: Linux sandbox: handle ENOSPC clone failure

> Linux 4.9 adds /proc/sys/user/max_user_namespaces to limit the number
> of concurrent user namespaces.  Sometimes the limit is set to 0 in
> which case clone() will return ENOSPC.  This CL avoids PCHECK()ing in
> that case.
>
> BUG=715138
> R=mdempsky@chromium.org
>
> Review-Url: https://codereview.chromium.org/2842033002
> Cr-Commit-Position: refs/heads/master@{#467271}

BUG=715138
TBR=mdempsky@chromium.org
NOPRESUBMIT=true
NOTRY=true

Review-Url: https://codereview.chromium.org/2852503003
Cr-Commit-Position: refs/branch-heads/3071@{#269}
Cr-Branched-From:
a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed:
https://chromium.googlesource.com/chromium/src/+/788c0bc6e3cdd9fff69ebb0ac48b...
==========

[commit-bot: I haz the power, 2017-04-27 20:56:56]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/788c0bc6e3cdd9fff69ebb0ac48b...

[mdempsky, 2017-04-27 21:12:23]

lgtm