I have a framework with 10 slaves, with the same label.

My test jobs end up stuck in queue saying that they are waiting for an available executor, but all of my slaves are up and not running anything. I have tried rebooting my slaves, and they still did not pick up any of the jobs in queue.

Plugins installed:
Active Directory plugin
1.39

Ant Plugin
1.2

build timeout plugin
1.14.1

conditional-buildstep
1.3.3

Copy Artifact Plugin
1.35.1

Cppcheck Plug-in
1.20

Credentials Plugin
1.22

0.2

CVS Plug-in
2.12

Email Extension Plugin
2.40.4

Environment Injector Plugin
1.91.3

External Monitor Job Type Plugin
1.4

Extra Columns Plugin
1.15

GIT client plugin
1.17.1

GIT plugin
2.3.5

Green Balls
1.14

HTML Publisher plugin
1.4

Javadoc Plugin
1.3

jenkins-reviewbot
2.4.6

JUnit Plugin
1.6

LDAP Plugin
1.11

Mailer Plugin
1.15

MapDB API Plugin
1.0.6.0

Matrix Authorization Strategy Plugin
1.2

Matrix Project Plugin
1.4

Maven Integration plugin
2.9

Multijob plugin
1.16

OWASP Markup Formatter Plugin
1.3

PAM Authentication plugin
1.2

Parameterized Trigger plugin
2.26

patch-parameter
1.2

Perforce Plugin
1.3.34

Priority Sorter Plugin
3.2

promoted builds plugin
2.21

Random String Parameter Plugin
1.0

Run Condition Plugin
1.0

SCM API Plugin
0.2

Script Security Plugin
1.14

Show Build Parameters plugin
1.0

Simple Theme Plugin
0.3

SSH Agent Plugin
1.6

SSH Credentials Plugin
1.11

SSH Slaves plugin
1.9

Subversion Plug-in
2.5

Token Macro Plugin
1.10

Translation Assistance plugin
1.12

user build vars plugin
1.4

Windows Slaves Plugin
1.0