Description: User thread can get powerpc perf_callchain_user_64 function into infinite loop References: http://www.openwall.com/lists/oss-security/2015/08/18/4 Notes: Bugs: upstream: released (4.1-rc1) [9a5cbce421a283e6aea3c4007f141735bf9da8c3] 3.16-upstream-stable: released (3.16.7-ckt11) 3.2-upstream-stable: released (3.2.70) 2.6.32-upstream-stable: ignored "EOL" sid: released (4.1.3-1) 3.16-jessie-security: released (3.16.7-ckt11-1+deb8u1) 3.2-wheezy-security: released (3.2.73-2+deb7u1) 2.6.32-squeeze-security: ignored "powerpc not supported in Squeeze LTS"