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@@ -51,11 +51,33 @@ static DEFINE_MUTEX(stack_sysctl_mutex);
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int stack_tracer_enabled;
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static int last_stack_tracer_enabled;
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+static inline void print_max_stack(void)
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+{
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+ long i;
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+ int size;
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+
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+ pr_emerg(" Depth Size Location (%d entries)\n"
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+ " ----- ---- --------\n",
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+ max_stack_trace.nr_entries - 1);
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+
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+ for (i = 0; i < max_stack_trace.nr_entries; i++) {
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+ if (stack_dump_trace[i] == ULONG_MAX)
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+ break;
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+ if (i+1 == max_stack_trace.nr_entries ||
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+ stack_dump_trace[i+1] == ULONG_MAX)
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+ size = stack_dump_index[i];
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+ else
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+ size = stack_dump_index[i] - stack_dump_index[i+1];
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+
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+ pr_emerg("%3ld) %8d %5d %pS\n", i, stack_dump_index[i],
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+ size, (void *)stack_dump_trace[i]);
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+ }
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+}
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+
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static inline void
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check_stack(unsigned long ip, unsigned long *stack)
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{
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- unsigned long this_size, flags;
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- unsigned long *p, *top, *start;
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+ unsigned long this_size, flags; unsigned long *p, *top, *start;
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static int tracer_frame;
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int frame_size = ACCESS_ONCE(tracer_frame);
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int i;
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@@ -149,8 +171,12 @@ check_stack(unsigned long ip, unsigned long *stack)
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i++;
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}
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- BUG_ON(current != &init_task &&
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- *(end_of_stack(current)) != STACK_END_MAGIC);
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+ if ((current != &init_task &&
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+ *(end_of_stack(current)) != STACK_END_MAGIC)) {
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+ print_max_stack();
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+ BUG();
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+ }
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+
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out:
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arch_spin_unlock(&max_stack_lock);
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local_irq_restore(flags);
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Minchan Kim