Similar patch to earlier x86-64 patch. When the dwarf2 unwinder fails
dump the left over stack with the old unwinder.
Also some clarifications in the headers.
Signed-off-by: Andi Kleen <[email protected]>
---
arch/i386/kernel/traps.c | 17 ++++++++++++++---
1 file changed, 14 insertions(+), 3 deletions(-)
Index: linux/arch/i386/kernel/traps.c
===================================================================
--- linux.orig/arch/i386/kernel/traps.c
+++ linux/arch/i386/kernel/traps.c
@@ -187,10 +187,21 @@ static void show_trace_log_lvl(struct ta
if (unwind_init_blocked(&info, task) == 0)
unw_ret = show_trace_unwind(&info, log_lvl);
}
- if (unw_ret > 0) {
- if (call_trace > 0)
+ if (unw_ret > 0 && !arch_unw_user_mode(&info)) {
+#ifdef CONFIG_STACK_UNWIND
+ print_symbol("DWARF2 unwinder stuck at %s\n",
+ UNW_PC(info.regs));
+ if (call_trace == 1) {
+ printk("Leftover inexact backtrace:\n");
+ if (UNW_SP(info.regs))
+ stack = (void *)UNW_SP(info.regs);
+ } else if (call_trace > 1)
return;
- printk("%sLegacy call trace:\n", log_lvl);
+ else
+ printk("Full inexact backtrace again:\n");
+#else
+ printk("Inexact backtrace:\n");
+#endif
}
}
-
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