This bug was fixed in the package linux - 3.13.0-49.83
---------------
linux (3.13.0-49.83) trusty; urgency=low
[ Upstream Kernel Changes ]
* powerpc/perf: Cap 64bit userspace backtraces to PERF_MAX_STACK_DEPTH
- LP: #1442180
-- Luis Henriques <luis.henriq...@canonical.com> Fri, 10 Apr 2015 18:46:02
+0100
** Changed in: linux (Ubuntu Trusty)
Status: In Progress => Fix Released
** Changed in: linux (Ubuntu Trusty)
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/1442180
Title:
powerpc/perf: Cap 64bit userspace backtraces to PERF_MAX_STACK_DEPTH
Status in linux package in Ubuntu:
In Progress
Status in linux-lts-utopic package in Ubuntu:
Invalid
Status in linux source package in Trusty:
Fix Released
Status in linux-lts-utopic source package in Trusty:
Fix Released
Status in linux source package in Utopic:
Fix Released
Status in linux-lts-utopic source package in Utopic:
Invalid
Status in linux source package in Vivid:
In Progress
Status in linux-lts-utopic source package in Vivid:
Invalid
Bug description:
Cap 64bit userspace backtraces to PERF_MAX_STACK_DEPTH
We cap 32bit userspace backtraces to PERF_MAX_STACK_DEPTH
(currently 127), but we forgot to do the same for 64bit backtraces.
If userspace creates a stack frame that points to itself we will
loop forever in the backtrace code with interrupts off.
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