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

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Date:   Sat, 30 Sep 2017 22:01:56 +0200
From:   Richard Weinberger <richard@...ma-star.at>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
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

Josh,

Am Mittwoch, 27. September 2017, 16:14:30 CEST schrieb Josh Poimboeuf:
> 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"			\

This fixes the issue for me!

Thanks,
//richard

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