perf: Stop stack frame walking off kernel addresses boundaries
While processing kernel perf callchains, an bad entry can be considered as a valid stack pointer but not as a kernel address. In this case, we hang in an endless loop. This can happen in an x86-32 kernel after processing the last entry in a kernel stacktrace. Just stop the stack frame walking after we encounter an invalid kernel address. This fixes a hard lockup in x86-32. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Paul Mackerras <paulus@samba.org> LKML-Reference: <1262227945-27014-1-git-send-regression-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
parent
7284ce6c9f
commit
c2c5d45d46
|
@ -123,13 +123,15 @@ print_context_stack_bp(struct thread_info *tinfo,
|
|||
while (valid_stack_ptr(tinfo, ret_addr, sizeof(*ret_addr), end)) {
|
||||
unsigned long addr = *ret_addr;
|
||||
|
||||
if (__kernel_text_address(addr)) {
|
||||
ops->address(data, addr, 1);
|
||||
frame = frame->next_frame;
|
||||
ret_addr = &frame->return_address;
|
||||
print_ftrace_graph_addr(addr, data, ops, tinfo, graph);
|
||||
}
|
||||
if (!__kernel_text_address(addr))
|
||||
break;
|
||||
|
||||
ops->address(data, addr, 1);
|
||||
frame = frame->next_frame;
|
||||
ret_addr = &frame->return_address;
|
||||
print_ftrace_graph_addr(addr, data, ops, tinfo, graph);
|
||||
}
|
||||
|
||||
return (unsigned long)frame;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(print_context_stack_bp);
|
||||
|
|
Loading…
Reference in a new issue