[DRBD-user] CentOS 7.3 3.10.0-514.10.2.el7.x86_64 w. DRBD v8.4.9-2: PANIC: ".1BUG: unable to handle kernel NULL pointer dereference at 0000000000000014"

[Adi Pircalabu]

Hi, initially submitted here:
https://bugzilla.redhat.com/show_bug.cgi?id=1442593

The node that crashed was at the time the active member of an active/passive Pacemaker cluster, using DRBD backed replicated storage for iSCSI and NFS resources. The RedHat developer closed the bug due to loading drbd out-of-tree. The module is built using the source from http://git.drbd.org/drbd-8.4.git/ Even though it may or may not be related to DRBD, I thought it's worth having your opinion on this.

More details below.

modinfo drbd

alias:          block-major-147-*
license:        GPL
version:        8.4.9-2
description:    drbd - Distributed Replicated Block Device v8.4.9-2

rhelversion:    7.3
srcversion:     F9BD1E13798E45BA4CA1B92
depends:        libcrc32c
vermagic:       3.10.0-514.10.2.el7.x86_64 SMP mod_unload modversions

parm:           disable_sendpage:bool
parm:           allow_oos:DONT USE! (bool)
parm:           proc_details:int
parm:           enable_faults:int
parm:           fault_rate:int
parm:           fault_count:int
parm:           fault_devs:int
parm:           usermode_helper:string

KERNEL: /data/adi/crash/3.10.0-514.10.2.el7.x86_64/vmlinux

        CPUS: 12
        DATE: Sat Apr 15 02:52:55 2017
      UPTIME: 9 days, 04:22:12
LOAD AVERAGE: 0.08, 0.08, 0.05
       TASKS: 416
    NODENAME: xd3
     RELEASE: 3.10.0-514.10.2.el7.x86_64
     VERSION: #1 SMP Fri Mar 3 00:04:05 UTC 2017
     MACHINE: x86_64 (1700 Mhz)
      MEMORY: 31.9 GB

         PID: 0
     COMMAND: "swapper/3"
        TASK: ffff8804fa559f60 (1 of 12) [THREAD_INFO: ffff8804fa680000]
         CPU: 3
       STATE: TASK_RUNNING (PANIC)


Thanks,

--
Adi Pircalabu

filename: /lib/modules/3.10.0-514.16.1.el7.x86_64/weak-updates/drbd84/drbd.ko author: Philipp Reisner <p...@linbit.com>, Lars Ellenberg <l...@linbit.com> parm: minor_count:Approximate number of drbd devices (1-255) (uint) DUMPFILE: /data/adi/crash/127.0.0.1-2017-04-15-02:53:06/vmcore [PARTIAL DUMP] PANIC: ".1BUG: unable to handle kernel NULL pointer dereference at 0000000000000014" Backtrace and other information extracted after the crash attached. Please let me know what other information I should provide.

_crash.tar.gz
Description: GNU Zip compressed data

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