Re: v4.10: kernel stack frame pointer .. has bad value (null)
From: H. Peter Anvin
Date: Tue Feb 21 2017 - 18:17:35 EST
On 02/21/17 15:12, Josh Poimboeuf wrote:
>> commit 24d86f59093b0bcb3756cdf47f2db10ff4e90dbb
>> Author: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
>> Date: Thu Oct 27 08:10:58 2016 -0500
>> x86/unwind: Ensure stack grows down
>> Add a sanity check to ensure the stack only grows down, and print
>> warning if the check fails.
>> Any ideas?
> Hi Pavel,
> I don't think I've seen this one. Any chance this came after resuming
> from a hibernation or suspend?
>> [ 1.047295] [drm] Memory usable by graphics device = 2048M
>> [ 1.047356] [drm] Replacing VGA console driver
>> [ 1.048029] Console: switching to colour dummy device 80x25
>> [ 1.048348] WARNING: kernel stack frame pointer at f50cdf98 in
>> swapper/2:0 has bad value (null)
>> [ 1.048349] unwind stack type:0 next_sp: (null) mask:a graph_idx:0
>> [ 1.048352] f50cdebc: 00000000f50cdec4 (0xf50cdec4)
FWIW, it would be really darned nice to not have all those zeroes in a
32-bit stack frame dump.
Is not a zero stack frame pointer value an end of stack token?