kdump fails to initialize Chelsio cxgb4 adapters on POWER with RHEL 7

Solution Unverified - Updated -

Environment

  • Red Hat Enterprise Linux 7
  • IBM POWER architecture (others can be prone to this issue as well)
  • Chelsio Communications Inc, T422-CR Unified Wire Ethernet Controller
  • kernel-3.10.0-123.16.1.el7.ppc64

Issue

  • kdump fails to save vmcore to network based destinations (NFS or SSH)
  • cxgb4 driver reports failure while probing adapter with "Adapter already initialized" message logged:
[    4.877078] cxgb4 0000:01:00.4: Using 64-bit direct DMA at offset 800000000000000
[    5.012412] cxgb4 0000:01:00.4: Coming up as MASTER: Adapter already initialized
[    5.212421] cxgb4 0000:01:00.4: mbox 4: 1400040080000c04 0 0 0 0 0 0 0
[    5.232843] cxgb4: probe of 0000:01:00.4 failed with error -12
[    5.253582] cxgb4 0004:01:00.4: Using 64-bit direct DMA at offset 800000000000000
[    5.412410] cxgb4 0004:01:00.4: Coming up as MASTER: Adapter already initialized
[    5.612421] cxgb4 0004:01:00.4: mbox 4: 1400040080000c04 0 0 0 0 0 0 0
[    5.632872] cxgb4: probe of 0004:01:00.4 failed with error -12

Resolution

  • Add cxgb4.force_init=1 to KDUMP_COMMANDLINE_APPEND variable defined in /etc/sysconfig/kdump file so that the diff will look like this and restart kdump:
-KDUMP_COMMANDLINE_APPEND="irqpoll maxcpus=1 noirqdistrib reset_devices cgroup_disable=memory numa=off udev.children-max=2 ehea.use_mcs=0 panic=10 rootflags=nofail"
+KDUMP_COMMANDLINE_APPEND="irqpoll maxcpus=1 noirqdistrib reset_devices cgroup_disable=memory numa=off udev.children-max=2 ehea.use_mcs=0 panic=10 rootflags=nofail cxgb4.force_init=1"

Diagnostic Steps

  • Check console messages on screen while testing kdump:
[    5.012412] cxgb4 0000:01:00.4: Coming up as MASTER: Adapter already initialized
[    5.232843] cxgb4: probe of 0000:01:00.4 failed with error -12

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