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authorSteven Rostedt <srostedt@redhat.com>2009-06-02 16:39:48 -0400
committerSteven Rostedt <rostedt@goodmis.org>2009-06-02 16:49:57 -0400
commitf7e8b616ed1cc6f790b82324bce8a2a60295e5c2 (patch)
treee46e50692d90ddcccf159accdcdd655d3dd0ffa5 /kernel/trace
parent26c01624a2a40f8a4ddf6449b65c9b1c418d0e72 (diff)
function-graph: move initialization of new tasks up in fork
When the function graph tracer is enabled, all new tasks must allocate a ret_stack to place the return address of functions. This is because the function graph tracer will replace the real return address with a call to the tracing of the exit function. This initialization happens in fork, but it happens too late. If fork fails, then it will call free_task and that calls the freeing of this ret_stack. But before initialization happens, the new (failed) task points to its parents ret_stack. If a fork failure happens during the function trace, it would be catastrophic for the parent. Also, there's no need to call ftrace_graph_exit_task from fork, since it is called by free_task which fork calls on failure. [ Impact: prevent crash during failed fork running function graph tracer ] Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace')
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