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[Bug runtime/17469] support kernel unwinding based on .eh_frame rather than .debug_frame data
- From: "wcohen at redhat dot com" <sourceware-bugzilla at sourceware dot org>
- To: systemtap at sourceware dot org
- Date: Fri, 10 Oct 2014 15:32:43 +0000
- Subject: [Bug runtime/17469] support kernel unwinding based on .eh_frame rather than .debug_frame data
- Auto-submitted: auto-generated
- References: <bug-17469-6586 at http dot sourceware dot org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=17469
--- Comment #1 from William Cohen <wcohen at redhat dot com> ---
This issue has been observed in the aarch64 kernels. The systemtap could only
do the backraces with a kernel build with the following patch:
--- ./arch/arm64/Makefile.orig 2014-10-08 12:06:39.413204335 -0400
+++ ./arch/arm64/Makefile 2014-10-08 12:04:57.972189568 -0400
@@ -20,6 +20,7 @@
KBUILD_DEFCONFIG := defconfig
KBUILD_CFLAGS += -mgeneral-regs-only
+KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
KBUILD_CPPFLAGS += -mbig-endian
AS += -EB
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