On 02/21/17 15:12, Josh Poimboeuf wrote: >> >> commit 24d86f59093b0bcb3756cdf47f2db10ff4e90dbb >> Author: Josh Poimboeuf <jpoim...@redhat.com> >> 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 >> a >> 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? -hpa