[kudu-CR] KUDU-2509 fix use-after-free in case of WAL replay error

["Alexey Serbin (Code Review)" <ge...@cloudera.org>]

Hello Tidy Bot, Mike Percy, Kudu Jenkins, Adar Dembo, 

I'd like you to reexamine a change. Please visit

    http://gerrit.cloudera.org:8080/10997

to look at the new patch set (#4).

Change subject: KUDU-2509 fix use-after-free in case of WAL replay error
......................................................................

KUDU-2509 fix use-after-free in case of WAL replay error

Fixed use-after-free mistake in case of an failure to apply a pending
commit message from the WAL while bootstrapping a tablet.

Also, a repro scenario to expose the use-after-free condition is added.
Prior to the fix, the repro scenario would crash with SIGSEGV on Linux
or with SIGBUS on OS X (at least for DEBUG builds).

Change-Id: I11373b1cc34d9e2e0181bee2d3841b49022218ed
---
M src/kudu/tablet/tablet_bootstrap-test.cc
M src/kudu/tablet/tablet_bootstrap.cc
2 files changed, 81 insertions(+), 3 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/97/10997/4
-- 
To view, visit http://gerrit.cloudera.org:8080/10997
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Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I11373b1cc34d9e2e0181bee2d3841b49022218ed
Gerrit-Change-Number: 10997
Gerrit-PatchSet: 4
Gerrit-Owner: Alexey Serbin <as...@cloudera.com>
Gerrit-Reviewer: Adar Dembo <ad...@cloudera.com>
Gerrit-Reviewer: Alexey Serbin <as...@cloudera.com>
Gerrit-Reviewer: Kudu Jenkins
Gerrit-Reviewer: Mike Percy <mp...@apache.org>
Gerrit-Reviewer: Tidy Bot