http://bugzilla.suse.com/show_bug.cgi?id=1055493
http://bugzilla.suse.com/show_bug.cgi?id=1055493#c1
--- Comment #1 from Oliver Kurz ---
what I found in the bootup log:
```
Sep 01 08:04:42 linux-28d6.suse kernel: WARNING: CPU: 2 PID: 0 at
../drivers/gpu/drm/i915/intel_uncore.c:633
hsw_unclaimed_reg_debug.isra.13+0x6b/0x90 [i915](
Sep 01 08:04:42 linux-28d6.suse kernel: Unclaimed register detected before
reading register 0x223a0
Sep 01 08:04:42 linux-28d6.suse kernel: Modules linked in: nf_log_ipv6
xt_pkttype xt_TCPMSS nf_log_ipv4 nf_log_common xt_LOG xt_limit af_packet
ip6t_REJECT nf
Sep 01 08:04:42 linux-28d6.suse kernel: intel_rapl x86_pkg_temp_thermal
intel_powerclamp coretemp videobuf2_v4l2 dell_smm_hwmon videobuf2_core
v4l2_common iw
Sep 01 08:04:42 linux-28d6.suse kernel: jitterentropy_rng drbg ansi_cprng
aesni_intel aes_x86_64 glue_helper lrw gf128mul ablk_helper cryptd ahci libahci
ser
Sep 01 08:04:42 linux-28d6.suse kernel: CPU: 2 PID: 0 Comm: swapper/2 Not
tainted 4.4.79-18.26-default #1
Sep 01 08:04:42 linux-28d6.suse kernel: Hardware name: Dell Inc. Latitude
E7250/0TVD2T, BIOS A07 09/01/2015
Sep 01 08:04:42 linux-28d6.suse kernel: 0000000000000000 ffffffff8132a157
ffff88021e503d58 ffffffffa035f7f0
Sep 01 08:04:42 linux-28d6.suse kernel: ffffffff8107ef11 ffff880215bb0078
ffff88021e503da8 00000000000223a0
Sep 01 08:04:42 linux-28d6.suse kernel: ffff880215bb0078 0000000000000046
ffffffff8107ef8c ffffffffa035f850
Sep 01 08:04:42 linux-28d6.suse kernel: Call Trace:
Sep 01 08:04:42 linux-28d6.suse kernel: [<ffffffff81019ea9>]
dump_trace+0x59/0x320
Sep 01 08:04:42 linux-28d6.suse kernel: [<ffffffff8101a26a>]
show_stack_log_lvl+0xfa/0x180
Sep 01 08:04:42 linux-28d6.suse kernel: [<ffffffff8101b011>]
show_stack+0x21/0x40
Sep 01 08:04:42 linux-28d6.suse kernel: [<ffffffff8132a157>]
dump_stack+0x5c/0x85
Sep 01 08:04:42 linux-28d6.suse kernel: [<ffffffff8107ef11>]
warn_slowpath_common+0x81/0xb0
Sep 01 08:04:42 linux-28d6.suse kernel: [<ffffffff8107ef8c>]
warn_slowpath_fmt+0x4c/0x50
Sep 01 08:04:42 linux-28d6.suse kernel: [<ffffffffa02db6db>]
hsw_unclaimed_reg_debug.isra.13+0x6b/0x90 [i915]
Sep 01 08:04:42 linux-28d6.suse kernel: [<ffffffffa02ddf99>]
gen6_read32+0x59/0x1c0 [i915]
Sep 01 08:04:42 linux-28d6.suse kernel: [<ffffffffa02d1855>]
intel_lrc_irq_handler+0x35/0x240 [i915]
Sep 01 08:04:42 linux-28d6.suse kernel: [<ffffffffa028f9e5>]
gen8_gt_irq_handler+0x215/0x240 [i915]
Sep 01 08:04:42 linux-28d6.suse kernel: [<ffffffffa028fa86>]
gen8_irq_handler+0x76/0x650 [i915]
Sep 01 08:04:42 linux-28d6.suse kernel: [<ffffffff810da336>]
__handle_irq_event_percpu+0x46/0x1c0
Sep 01 08:04:42 linux-28d6.suse kernel: [<ffffffff810da4d0>]
handle_irq_event_percpu+0x20/0x50
Sep 01 08:04:42 linux-28d6.suse kernel: [<ffffffff810da53d>]
handle_irq_event+0x3d/0x60
Sep 01 08:04:42 linux-28d6.suse kernel: [<ffffffff810dd6b8>]
handle_edge_irq+0x88/0x130
Sep 01 08:04:42 linux-28d6.suse kernel: [<ffffffff81019e39>]
handle_irq+0x19/0x30
Sep 01 08:04:42 linux-28d6.suse kernel: [<ffffffff81613408>] do_IRQ+0x48/0xd0
Sep 01 08:04:42 linux-28d6.suse kernel: [<ffffffff8161124c>]
common_interrupt+0x8c/0x8c
Sep 01 08:04:42 linux-28d6.suse kernel: DWARF2 unwinder stuck at
ret_from_intr+0x0/0x1b
Sep 01 08:04:42 linux-28d6.suse kernel:
Sep 01 08:04:42 linux-28d6.suse kernel: Leftover inexact backtrace:
Sep 01 08:04:42 linux-28d6.suse kernel: <IRQ> <EOI> [<ffffffff814d43e7>] ?
cpuidle_enter_state+0xd7/0x270
Sep 01 08:04:42 linux-28d6.suse kernel: [<ffffffff814d43c2>] ?
cpuidle_enter_state+0xb2/0x270
Sep 01 08:04:42 linux-28d6.suse kernel: [<ffffffff810c3d9d>] ?
cpu_startup_entry+0x2ad/0x3a0
Sep 01 08:04:42 linux-28d6.suse kernel: [<ffffffff8104d6a0>] ?
start_secondary+0x150/0x180
```
but I don't think it's the same error.
Could someone please give me a hint how I could debug, gather logs, save kdump,
etc.?
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