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Subjectcall trace warn_slowpath_common / warn_slowpath_fmt / ioremap_caller ... on every boot
Hi,

On my system the kernel prints a stack trace and some error messages on
every boot, see below.

This is currently not causing any notable malfunction, but I wonder
what this is about. I tried bisecting the issue and endet up with this
commit as the first bad commit:
15c1247953e8a45232ed5a5540f291d2d0a77665

Interestingly that's itself a revert of a previous commit.

Any ideas what's wrong here? I'd gladly provide more info if needed.


The device is a Thinkpad X1 Carbon 2014 edition (20A7). Here is the full
dmesg output:
https://files.hboeck.de/dmesg-calltrace.txt.xz

Here's some more info about the hw, like lspci, dmidecode, lsusb output:
http://int21.de/x1carbon/data/


[ 0.129335] resource sanity check: requesting [mem 0xfed10000-0xfed15fff], which spans more than pnp 00:01 [mem 0xfed10000-0xfed13fff]
[ 0.129478] ------------[ cut here ]------------
[ 0.129569] WARNING: CPU: 0 PID: 1 at arch/x86/mm/ioremap.c:198 __ioremap_caller+0x200/0x350()
[ 0.129705] Info: mapping multiple BARs. Your kernel is fine.
[ 0.129757] Modules linked in:

[ 0.129973] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.2.0 #1
[ 0.130064] Hardware name: LENOVO 20A7CTO1WW/20A7CTO1WW, BIOS GRET43WW (1.20 ) 01/08/2015
[ 0.130198] ffffffff819914f1 ffff880214d1bb18 ffffffff817e0a3a 0000000000000001
[ 0.130487] ffff880214d1bb68 ffff880214d1bb58 ffffffff810b38a0 0000000080000200
[ 0.130776] ffffc90000e88000 ffffc90000e88000 00000000fed10000 0000000000000000
[ 0.131076] Call Trace:
[ 0.131163] [<ffffffff817e0a3a>] dump_stack+0x45/0x57
[ 0.131256] [<ffffffff810b38a0>] warn_slowpath_common+0x80/0xc0
[ 0.131350] [<ffffffff810b3921>] warn_slowpath_fmt+0x41/0x50
[ 0.131441] [<ffffffff8107baf0>] __ioremap_caller+0x200/0x350
[ 0.131533] [<ffffffff8107bc52>] ioremap_nocache+0x12/0x20
[ 0.131625] [<ffffffff81061448>] snb_uncore_imc_init_box+0x68/0x90
[ 0.131717] [<ffffffff8105f961>] uncore_pci_probe+0xd1/0x1b0
[ 0.131809] [<ffffffff812f3050>] local_pci_probe+0x40/0xa0
[ 0.131913] [<ffffffff811fc288>] ? sysfs_do_create_link_sd.isra.2+0x68/0xb0
[ 0.132009] [<ffffffff812f3172>] pci_device_probe+0xc2/0x110
[ 0.132101] [<ffffffff81481471>] driver_probe_device+0x131/0x2d0
[ 0.132193] [<ffffffff8148169b>] __driver_attach+0x8b/0x90
[ 0.132283] [<ffffffff81481610>] ? driver_probe_device+0x2d0/0x2d0
[ 0.132377] [<ffffffff8147f6ef>] bus_for_each_dev+0x5f/0x90
[ 0.132467] [<ffffffff81480ff9>] driver_attach+0x19/0x20
[ 0.132558] [<ffffffff81480c4b>] bus_add_driver+0x1ab/0x220
[ 0.132650] [<ffffffff81b42ab9>] ? uncore_types_exit+0x26/0x26
[ 0.132741] [<ffffffff81481eab>] driver_register+0x5b/0xe0
[ 0.132832] [<ffffffff812f2847>] __pci_register_driver+0x47/0x50
[ 0.132934] [<ffffffff81b42b8b>] intel_uncore_init+0xd2/0x2aa
[ 0.133025] [<ffffffff81b42ab9>] ? uncore_types_exit+0x26/0x26
[ 0.133117] [<ffffffff810002c3>] do_one_initcall+0x83/0x1a0
[ 0.133209] [<ffffffff81b38fc6>] kernel_init_freeable+0x14b/0x1d8
[ 0.133303] [<ffffffff817dd800>] ? rest_init+0x80/0x80
[ 0.133393] [<ffffffff817dd809>] kernel_init+0x9/0xe0
[ 0.133483] [<ffffffff817e7c9f>] ret_from_fork+0x3f/0x70
[ 0.133574] [<ffffffff817dd800>] ? rest_init+0x80/0x80
[ 0.133665] ---[ end trace 60c3f2999044d108 ]---

--
Hanno Böck
http://hboeck.de/

mail/jabber: hanno@hboeck.de
GPG: BBB51E42
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