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author | Steven Rostedt <srostedt@redhat.com> | 2010-03-12 19:41:23 -0500 |
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committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-04-01 15:58:10 -0700 |
commit | 090fe6cbe1fe9f15a219e38c0edea6960dcadb69 (patch) | |
tree | 346999cc9c79b77f00029bb9a42e951678f047c8 /net | |
parent | 9dfa691caee866df28691815e708a914349a6f10 (diff) |
function-graph: Init curr_ret_stack with ret_stack
commit ea14eb714041d40fcc5180b5a586034503650149 upstream.
If the graph tracer is active, and a task is forked but the allocating of
the processes graph stack fails, it can cause crash later on.
This is due to the temporary stack being NULL, but the curr_ret_stack
variable is copied from the parent. If it is not -1, then in
ftrace_graph_probe_sched_switch() the following:
for (index = next->curr_ret_stack; index >= 0; index--)
next->ret_stack[index].calltime += timestamp;
Will cause a kernel OOPS.
Found with Li Zefan's ftrace_stress_test.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'net')
0 files changed, 0 insertions, 0 deletions