If we overflow the stack, print_context_stack will abort. Detect this case and rewind back into the valid part of the stack so that we can trace it.
Signed-off-by: Andy Lutomirski <l...@kernel.org> --- arch/x86/kernel/dumpstack.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c index d4d085e27d04..400a2e17c1d1 100644 --- a/arch/x86/kernel/dumpstack.c +++ b/arch/x86/kernel/dumpstack.c @@ -100,6 +100,13 @@ print_context_stack(struct thread_info *tinfo, { struct stack_frame *frame = (struct stack_frame *)bp; + /* + * If we overflowed the stack into a guard page, jump back to the + * bottom of the usable stack. + */ + if ((unsigned long)tinfo - (unsigned long)stack < PAGE_SIZE) + stack = (unsigned long *)tinfo + 1; + while (valid_stack_ptr(tinfo, stack, sizeof(*stack), end)) { unsigned long addr; -- 2.7.4