[Bugs] [Bug 1229658] New: STACK_RESET may crash with concurrent statedump requests to a glusterfs process

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1229658

            Bug ID: 1229658
           Summary: STACK_RESET may crash with concurrent statedump
                    requests to a glusterfs process
           Product: GlusterFS
           Version: mainline
         Component: core
          Assignee: kparthas at redhat.com
          Reporter: kparthas at redhat.com
                CC: bugs at gluster.org, gluster-bugs at redhat.com



Description of problem:
statedump requests that traverse call frames of all call stacks in execution
may race with a STACK_RESET on a stack. This could crash the corresponding
glusterfs process. For e.g, recently we observed this in a regression test
case, tests/basic/afr/sparse-self-heal.t.

Version-Release number of selected component (if applicable):
N/A

How reproducible:
Intermittent

Steps to Reproduce:
1. Maintain constant I/O on a GlusterFS volume.
2. Issue a statedump request, using kill -SIGUSR1 <process-pid> concurrently.
3.

Actual results:
glusterfs process may crash

Expected results:
glusterfs process shouldn't crash and the statedump must be logged
successfully.

Additional info:

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