[Bug 100428] New: [KBL][BAT] igt at gem_exec_suspend@basic-s4-devices dmesg warning

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100428

            Bug ID: 100428
           Summary: [KBL][BAT] igt at gem_exec_suspend@basic-s4-devices dmesg
                    warning
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: jani.saarinen at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

On newly added KBL GT3e (Dell XPS 13,Kaby Lake i7-7560u, Iris Graphics 640 /
gt3e       eDP)

Caused dmesg warning:
https://intel-gfx-ci.01.org/CI/CI_DRM_2415/fi-kbl-7560u/igt@gem_exec_suspend@basic-s4-devices.html

[  268.383988] Suspending console(s) (use no_console_suspend to debug)
[  273.899061] ------------[ cut here ]------------
[  273.899068] WARNING: CPU: 0 PID: 8443 at net/sched/sch_generic.c:316
dev_watchdog+0x225/0x230
[  273.899071] Modules linked in: snd_hda_codec_hdmi snd_hda_codec_realtek
snd_hda_codec_generic asix usbnet mii x86_pkg_temp_thermal intel_powerclamp
coretemp crct10dif_pclmul crc32_pclmul ghash_clmulni_intel i915 snd_hda_intel
snd_hda_codec snd_hwdep snd_hda_core snd_pcm mei_me mei prime_numbers i2c_hid
pinctrl_sunrisepoint pinctrl_intel
[  273.899101] CPU: 0 PID: 8443 Comm: gem_exec_suspen Not tainted
4.11.0-rc4-CI-CI_DRM_2415+ #1
[  273.899102] Hardware name: Dell Inc. XPS 13 9360/093TW6, BIOS 1.3.2
01/18/2017
[  273.899103] Call Trace:
[  273.899104]  <IRQ>
[  273.899107]  dump_stack+0x67/0x92
[  273.899110]  __warn+0xc6/0xe0
[  273.899113]  warn_slowpath_fmt+0x4a/0x50
[  273.899117]  dev_watchdog+0x225/0x230
[  273.899119]  ? qdisc_rcu_free+0x40/0x40
[  273.899120]  ? qdisc_rcu_free+0x40/0x40
[  273.899122]  call_timer_fn+0x92/0x380
[  273.899123]  ? process_timeout+0x10/0x10
[  273.899125]  ? qdisc_rcu_free+0x40/0x40
[  273.899127]  expire_timers+0x150/0x1f0
[  273.899129]  run_timer_softirq+0x7c/0x160
[  273.899133]  __do_softirq+0x116/0x4c0
[  273.899136]  irq_exit+0xa9/0xc0
[  273.899138]  smp_apic_timer_interrupt+0x38/0x50
[  273.899141]  apic_timer_interrupt+0x90/0xa0
[  273.899143] RIP: 0010:delay_tsc+0x33/0xc0
[  273.899144] RSP: 0018:ffffc90000423cd8 EFLAGS: 00000286 ORIG_RAX:
ffffffffffffff10
[  273.899146] RAX: 0000000080000000 RBX: 000000056e39400e RCX:
0000000000000001
[  273.899147] RDX: 0000000080000001 RSI: ffffffff81c7659d RDI:
00000000ffffffff
[  273.899148] RBP: ffffc90000423cf8 R08: 0000000000000000 R09:
0000000000000001
[  273.899149] R10: 0000000000000000 R11: 0000000000000000 R12:
000000056e245b14
[  273.899150] R13: 0000000000249f13 R14: 0000000000000000 R15:
ffff88026f3816e0
[  273.899152]  </IRQ>
[  273.899156]  ? delay_tsc+0x6b/0xc0
[  273.899158]  __delay+0xa/0x10
[  273.899160]  __const_udelay+0x31/0x40
[  273.899162]  hibernation_debug_sleep+0x20/0x30
[  273.899164]  hibernation_snapshot+0x2bc/0x5f0
[  273.899166]  hibernate+0x17c/0x310
[  273.899168]  state_store+0xe0/0xf0
[  273.899171]  kobj_attr_store+0xf/0x20
[  273.899173]  sysfs_kf_write+0x40/0x50
[  273.899175]  kernfs_fop_write+0x130/0x1b0
[  273.899179]  __vfs_write+0x23/0x120
[  273.899181]  ? rcu_read_lock_sched_held+0x75/0x80
[  273.899182]  ? rcu_sync_lockdep_assert+0x2a/0x50
[  273.899185]  ? __sb_start_write+0x102/0x210
[  273.899186]  ? vfs_write+0x17d/0x1f0
[  273.899188]  vfs_write+0xc6/0x1f0
[  273.899191]  ? trace_hardirqs_on_caller+0xe7/0x200
[  273.899193]  SyS_write+0x44/0xb0
[  273.899196]  entry_SYSCALL_64_fastpath+0x1c/0xb1
[  273.899197] RIP: 0033:0x7f843a81e4a0
[  273.899198] RSP: 002b:00007ffe7a665c18 EFLAGS: 00000246 ORIG_RAX:
0000000000000001
[  273.899200] RAX: ffffffffffffffda RBX: ffffffff8147edf3 RCX:
00007f843a81e4a0
[  273.899201] RDX: 0000000000000004 RSI: 000000000041c921 RDI:
0000000000000014
[  273.899202] RBP: ffffc90000423f88 R08: 0000000000ee26b0 R09:
0000000000000000
[  273.899203] R10: 0000000000000000 R11: 0000000000000246 R12:
000000000041c921
[  273.899204] R13: 0000000000000014 R14: 0000000000000000 R15:
0000000000000000
[  273.899207]  ? __this_cpu_preempt_check+0x13/0x20
[  273.899211] ---[ end trace 159db5eca7569c07 ]---
[  274.705848] usb usb1: root hub lost power or was reset
[  274.705850] usb usb2: root hub lost power or was reset

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