netdev - Re: WARNING: kernel stack frame pointer at ffff880156a5fea0 in bash:2103 has bad value 00007ffec7d87e50

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Date:   Wed, 27 Sep 2017 09:14:30 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Richard Weinberger <richard@...ma-star.at>
Cc:     Alexei Starovoitov <alexei.starovoitov@...il.com>, ast@...nel.org,
        daniel@...earbox.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, mingo@...nel.org
Subject: Re: WARNING: kernel stack frame pointer at ffff880156a5fea0 in
 bash:2103 has bad value 00007ffec7d87e50

On Wed, Sep 27, 2017 at 08:51:22AM +0200, Richard Weinberger wrote:
> Am Mittwoch, 27. September 2017, 00:42:46 CEST schrieb Josh Poimboeuf:
> > > Here is another variant of the warning, it matches the attached .config:
> > I can take a look at it.  Unfortunately, for these types of issues I
> > often need the vmlinux file to be able to make sense of the unwinder
> > dump.  So if you happen to have somewhere to copy the vmlinux to, that
> > would be helpful.  Or if you give me your GCC version I can try to
> > rebuild it locally.
> 
> There you go:
> http://git.infradead.org/~rw/bpf_splat/vmlinux.xz

Thanks.  Can you test this fix?


diff --git a/arch/x86/kernel/kprobes/common.h b/arch/x86/kernel/kprobes/common.h
index db2182d63ed0..3fc0f9a794cb 100644
--- a/arch/x86/kernel/kprobes/common.h
+++ b/arch/x86/kernel/kprobes/common.h
@@ -3,6 +3,15 @@
 
 /* Kprobes and Optprobes common header */
 
+#include <asm/asm.h>
+
+#ifdef CONFIG_FRAME_POINTER
+# define SAVE_RBP_STRING "	push %" _ASM_BP "\n" \
+			 "	mov  %" _ASM_SP ", %" _ASM_BP "\n"
+#else
+# define SAVE_RBP_STRING "	push %" _ASM_BP "\n"
+#endif
+
 #ifdef CONFIG_X86_64
 #define SAVE_REGS_STRING			\
 	/* Skip cs, ip, orig_ax. */		\
@@ -17,7 +26,7 @@
 	"	pushq %r10\n"			\
 	"	pushq %r11\n"			\
 	"	pushq %rbx\n"			\
-	"	pushq %rbp\n"			\
+	SAVE_RBP_STRING				\
 	"	pushq %r12\n"			\
 	"	pushq %r13\n"			\
 	"	pushq %r14\n"			\
@@ -48,7 +57,7 @@
 	"	pushl %es\n"			\
 	"	pushl %ds\n"			\
 	"	pushl %eax\n"			\
-	"	pushl %ebp\n"			\
+	SAVE_RBP_STRING				\
 	"	pushl %edi\n"			\
 	"	pushl %esi\n"			\
 	"	pushl %edx\n"			\