This bug was fixed in the package linux-lts-utopic -
3.16.0-34.47~14.04.1
---------------
linux-lts-utopic (3.16.0-34.47~14.04.1) 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 17:39:49
+0100
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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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