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Subjectv4.10: kernel stack frame pointer .. has bad value (null)
Hi!

Thinkpad X220, in 32 bit mode... and I'm getting rather scary messages
from kernel during boot:

Git blame says that message comes from commit

commit 24d86f59093b0bcb3756cdf47f2db10ff4e90dbb
Author: Josh Poimboeuf <jpoimboe@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?
Pavel

[ 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)
[ 1.048356] f50cdec0: 00000000c40489b7 (irq_exit+0x87/0xa0)
[ 1.048357] f50cdec4: 00000000f50cded0 (0xf50cded0)
[ 1.048361] f50cdec8: 00000000c402f6d3
(smp_apic_timer_interrupt+0x33/0x40)
[ 1.048362] f50cdecc: 000000003e7c28eb (0x3e7c28eb)
[ 1.048363] f50cded0: 00000000f50cded9 (0xf50cded9)
[ 1.048366] f50cded4: 00000000c4b7ac8e
(apic_timer_interrupt+0x36/0x3c)
[ 1.048367] f50cded8: 000000003e7c28eb (0x3e7c28eb)
[ 1.048368] f50cdedc: 0000000000000001 (0x1)
[ 1.048370] f50cdee0: 00000000f57c41c0 (0xf57c41c0)
[ 1.048370] f50cdee4: 0000000000000000 ...
[ 1.048371] f50cdee8: 0000000000000002 (0x2)
[ 1.048372] f50cdeec: 00000000f50cdf30 (0xf50cdf30)
[ 1.048373] f50cdef0: 000000003e7c28eb (0x3e7c28eb)
[ 1.048376] f50cdef4: 00000000c506007b (cltrack_prog+0x7fb/0x1000)
[ 1.048377] f50cdef8: 000000000000007b (0x7b)
[ 1.048378] f50cdefc: 00000000000000d8 (0xd8)
[ 1.048379] f50cdf00: 00000000c50600e0 (cltrack_prog+0x860/0x1000)
[ 1.048380] f50cdf04: 00000000ffffff10 (0xffffff10)
[ 1.048384] f50cdf08: 00000000c48d05b5
(cpuidle_enter_state+0xf5/0x220)
[ 1.048384] f50cdf0c: 0000000000000060 (0x60)
[ 1.048385] f50cdf10: 0000000000200286 (0x200286)
[ 1.048386] f50cdf14: 0000000000000000 ...
[ 1.048387] f50cdf18: 00000000ffb8fad0 (0xffb8fad0)
[ 1.048388] f50cdf1c: 000000003e6bbd2b (0x3e6bbd2b)
[ 1.048389] f50cdf20: 0000000000000000 ...
[ 1.048391] f50cdf24: 00000000c506c680 (max_cstate+0x2c/0x2c)
[ 1.048394] f50cdf28: 00000000c506c680 (max_cstate+0x2c/0x2c)
[ 1.048394] f50cdf2c: 00000000f50a2040 (0xf50a2040)
[ 1.048395] f50cdf30: 00000000f50cdf3c (0xf50cdf3c)
[ 1.048397] f50cdf34: 00000000c48d06ff (cpuidle_enter+0xf/0x20)
[ 1.048398] f50cdf38: 0000000000000000 ...
[ 1.048399] f50cdf3c: 00000000f50cdf48 (0xf50cdf48)
[ 1.048402] f50cdf40: 00000000c4083113 (call_cpuidle+0x23/0x40)
[ 1.048403] f50cdf44: 00000000ffb8fad0 (0xffb8fad0)
[ 1.048404] f50cdf48: 00000000f50cdf60 (0xf50cdf60)
[ 1.048406] f50cdf4c: 00000000c4083364 (do_idle+0x174/0x1d0)
[ 1.048407] f50cdf50: 00000000f50a2040 (0xf50a2040)
[ 1.048408] f50cdf54: 000000008c0ed583 (0x8c0ed583)
[ 1.048409] f50cdf58: 0000000000000087 (0x87)
[ 1.048410] f50cdf5c: 000000009779245f (0x9779245f)
[ 1.048411] f50cdf60: 00000000f50cdf78 (0xf50cdf78)
[ 1.048413] f50cdf64: 00000000c408361d
(cpu_startup_entry+0x5d/0x60)
[ 1.048414] f50cdf68: 0000000033ee4c15 (0x33ee4c15)
[ 1.048415] f50cdf6c: 00000000c9d84398 (0xc9d84398)
[ 1.048417] f50cdf70: 0000000002100800 (0x2100800)
[ 1.048418] f50cdf74: 000000000fdc6fb2 (0xfdc6fb2)
[ 1.048418] f50cdf78: 00000000f50cdf98 (0xf50cdf98)
[ 1.048421] f50cdf7c: 00000000c402d216
(start_secondary+0x176/0x1c0)
[ 1.048422] f50cdf80: 000000000fdc6fb2 (0xfdc6fb2)
[ 1.048423] f50cdf84: 00000000d5425adc (0xd5425adc)
[ 1.048424] f50cdf88: 0000000000000002 (0x2)
[ 1.048425] f50cdf8c: 00000000ffffffff (0xffffffff)
[ 1.048425] f50cdf90: 0000000000000000 ...
[ 1.048426] f50cdf94: 00000000f50cdfac (0xf50cdfac)
[ 1.048427] f50cdf98: 0000000000000000 ...
[ 1.048429] f50cdf9c: 00000000c4000237 (startup_32_smp+0x16b/0x16d)
[ 1.048429] f50cdfa0: 0000000000200002 (0x200002)
[ 1.048430] f50cdfa4: 0000000000000000 ...
[ 1.048432] f50cdfa8: 00000000c4000237 (startup_32_smp+0x16b/0x16d)
[ 1.048432] f50cdfac: 0000000000000000 ...
[ 1.048433] f50cdff4: 0000000000000100 (0x100)
[ 1.048434] f50cdff8: 0000000000000200 (0x200)
[ 1.048435] f50cdffc: 0000000000000000 ...
[ 1.060368] [drm] Supports vblank timestamp caching Rev 2
(21.10.2013).
[ 1.060373] [drm] Driver supports precise vblank timestamp query.
[ 1.061668] i915 0000:00:02.0: vgaarb: changed VGA decodes:
olddecodes=io+mem,decodes=io+mem:owns=io+mem
[ 1.146917] ACPI: Video Device [VID] (multi-head: yes rom: no
post: no)

--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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