| commit | 090fe6cbe1fe9f15a219e38c0edea6960dcadb69 | |
| author | Steven Rostedt <srostedt@redhat.com> | |
| Sat, 13 Mar 2010 00:41:23 +0000 (12 19:41 -0500) | ||
| committer | Greg Kroah-Hartman <gregkh@suse.de> | |
| Thu, 1 Apr 2010 22:58:10 +0000 (1 15:58 -0700) | ||
| tree | 346999cc9c79b77f00029bb9a42e951678f047c8 | treesnapshot (tar.gz zip) |
| parent | 9dfa691caee866df28691815e708a914349a6f10 | commitdiff |
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>
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>
| kernel/trace/ftrace.c | diffblobblamehistory |