[LU-9914] Dynamic Discovery - discovery hangs if max_interfaces is changed from 200->16

• Type: Bug
• Resolution: Unresolved
• Priority: Minor
• Labels: patch
• Severity: 3
• Assignee: Amir Shehata (Inactive)
• Reporter: Amir Shehata (Inactive)

Description

NOTE: I see that after this patch:
https://review.whamcloud.com/#/c/28702/

Without this patch the problem was being hidden, by an immediate failure.

Steps:

Peer 2:
net:
    - net type: lo
      local NI(s):
        - nid: 0@lo
          status: up
    - net type: tcp
      local NI(s):
        - nid: 192.168.122.30@tcp
          status: up
          interfaces:
              0: eth0
        - nid: 192.168.122.31@tcp
          status: up
          interfaces:
              0: eth1
        - nid: 192.168.122.32@tcp
          status: up
          interfaces:
              0: eth2
        - nid: 192.168.122.33@tcp
          status: up
          interfaces:
              0: eth3
        - nid: 192.168.122.34@tcp
          status: up
          interfaces:
              0: eth4
        - nid: 192.168.122.35@tcp
          status: up
          interfaces:
              0: eth5
        - nid: 192.168.122.36@tcp
          status: up
          interfaces:
              0: eth6
        - nid: 192.168.122.37@tcp
          status: up
          interfaces:
              0: eth7
        - nid: 192.168.122.38@tcp
          status: up
          interfaces:
              0: eth8
        - nid: 192.168.122.39@tcp
          status: up
          interfaces:
              0: eth9
        - nid: 192.168.122.40@tcp
          status: up
          interfaces:
              0: eth10
        - nid: 192.168.122.41@tcp
          status: up
          interfaces:
              0: eth11
        - nid: 192.168.122.42@tcp
          status: up
          interfaces:
              0: eth12
        - nid: 192.168.122.43@tcp
          status: up
          interfaces:
              0: eth13
        - nid: 192.168.122.44@tcp
          status: up
          interfaces:
              0: eth14
        - nid: 192.168.122.45@tcp
          status: up
          interfaces:
              0: eth15
        - nid: 192.168.122.46@tcp
          status: up
          interfaces:
              0: eth16

#peer 1
modprobe lnet
lnetctl lnet configure
lnetctl net add --net tcp --if eth0,eth1
# max_interfaces default to 200
lnetctl discover 192.168.122.30@tcp
lnetctl set max_interfaces 16
# discover hangs (I kill it... so it might come back after a while, but haven't waited)
lnetctl discover 192.168.122.30@tcp

Issue Links

• is related to: LU-9909 memory leak in lnet_discover()
• is related to: LU-9480 LNet Dynamic Discovery