This has been merged to master-next on Feb 13, as part of the v4.4.45
update.
** Changed in: linux (Ubuntu)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1666647
Title:
ftrace on xenial can be hung, cause an oops or reboot
Status in linux package in Ubuntu:
Fix Committed
Bug description:
== SRU Request, Xenial ==
While writing an ftrace smoke test I managed to hang, oops and reboot
the kernel when running the same test on the current xenial kernel on
amd64. The test works fine on other kernels, so this is specific to
Xenial.
== Test case ==
http://kernel.ubuntu.com/git/ubuntu/autotest-client-
tests.git/commit/?id=cb1d178ee4cf42cffbf5ec20b9707365aa941f16
Without the fix, the kernel will hang/crash. With the fix the test
will run to completion as expected.
== Fix ==
Upstream commit:
commit 8329e818f14926a6040df86b2668568bde342ebf
Author: Steven Rostedt <[email protected]>
Date: Mon May 16 23:00:35 2016 -0400
ftrace/x86: Set ftrace_stub to weak to prevent gcc from using short
jumps to it
== Regression Potenial ==
Slim to zero.
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