ftrace on xenial can be hung, cause an oops or reboot
Bug #1666647 reported by
Colin Ian King
This bug affects 1 person
| Affects | Status | Importance | Assigned to | Milestone | |
|---|---|---|---|---|---|
| linux (Ubuntu) |
Fix Released
|
Medium
|
Colin Ian King | ||
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 ==
Without the fix, the kernel will hang/crash. With the fix the test will run to completion as expected.
== Fix ==
Upstream commit:
commit 8329e818f14926a
Author: Steven Rostedt <email address hidden>
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.
| Changed in linux (Ubuntu): | |
| importance: | Undecided → Medium |
| status: | New → In Progress |
| assignee: | nobody → Colin Ian King (colin-king) |
Revision history for this message
| Colin Ian King (colin-king) wrote | #1 |
| Changed in linux (Ubuntu): | |
| status: | In Progress → Fix Committed |
Revision history for this message
| Colin Ian King (colin-king) wrote | #2 |
| Changed in linux (Ubuntu): | |
| status: | Fix Committed → Fix Released |
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This has been merged to master-next on Feb 13, as part of the v4.4.45
update.