[Bug 72765] [ivb efi] Switching from efifb to i915.ko causes a hard hang with fbcon=vc:2-6

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=72765

--- Comment #4 from Chris Wilson <chris at chris-wilson.co.uk> ---
And now for something different:

[    7.372961] WARNING: at kernel/workqueue.c:1365 __queue_work+0x216/0x292()
[    7.372964] Modules linked in: coretemp arc4 kvm_intel kvm iwldvm
crc32c_intel mac80211 ghash_clmulni_intel cryptd joydev hid_lenovo_tpkbd
lib80211 iTCO_wdt iwlwifi iTCO_vendor_support i915(+) btusb snd_hda_codec_hdmi
bluetooth evdev snd_hda_intel usbhid snd_hda_codec pcspkr hid cfg80211
microcode snd_hwdep i2c_i801 snd_pcm drm_kms_helper lpc_ich drm mfd_core
snd_page_alloc rfkill snd_timer snd soundcore mei_me i2c_algo_bit video mei
acpi_cpufreq mperf i2c_core button processor ext4 crc16 jbd2 mbcache sg sd_mod
crc_t10dif ahci libahci libata scsi_mod thermal fan ehci_pci ehci_hcd
thermal_sys usbcore usb_common
[    7.373068] CPU: 0 PID: 660 Comm: ps Not tainted 3.10.9+ #55
[    7.373071] Hardware name:                  /D33217CK, BIOS
GKPPT10H.86A.0025.2012.1011.1534 10/11/2012
[    7.373075]  ffffffff81596a1e ffff88045f203d38 ffffffff813eaef6
ffff88045f203d78
[    7.373083]  ffffffff81041027 ffff88045f203d78 0000000000000000
ffff88045f217f00
[    7.373091]  ffff88044a89c800 ffff88042b473aa0 0000000000000000
ffff88045f203d88
[    7.373098] Call Trace:
[    7.373101]  <IRQ>  [<ffffffff813eaef6>] dump_stack+0x19/0x1b
[    7.373115]  [<ffffffff81041027>] warn_slowpath_common+0x62/0x7b
[    7.373121]  [<ffffffff81041055>] warn_slowpath_null+0x15/0x17
[    7.373127]  [<ffffffff8105aa82>] __queue_work+0x216/0x292
[    7.373133]  [<ffffffff8105ab65>] queue_work_on+0x4c/0x7c
[    7.373140]  [<ffffffff8123cebb>] ? fbcon_add_cursor_timer+0xfb/0xfb
[    7.373146]  [<ffffffff8123cee1>] cursor_timer_handler+0x26/0x42
[    7.373153]  [<ffffffff8104ee1f>] call_timer_fn+0xcc/0x1ea
[    7.373160]  [<ffffffff8104ed53>] ? detach_if_pending+0x7a/0x7a
[    7.373166]  [<ffffffff8123cebb>] ? fbcon_add_cursor_timer+0xfb/0xfb
[    7.373172]  [<ffffffff8104f27b>] run_timer_softirq+0x19c/0x1e4
[    7.373178]  [<ffffffff8104874e>] ? __do_softirq+0x9e/0x2a7
[    7.373183]  [<ffffffff810487e9>] __do_softirq+0x139/0x2a7
[    7.373189]  [<ffffffff81048a7a>] irq_exit+0x56/0x9b
[    7.373196]  [<ffffffff8102af31>] smp_apic_timer_interrupt+0x77/0x85
[    7.373203]  [<ffffffff813f5ff2>] apic_timer_interrupt+0x72/0x80
[    7.373206]  <EOI>  [<ffffffff8113ea70>] ? spin_lock+0x9/0xb
[    7.373217]  [<ffffffff8120d8c1>] ? do_raw_spin_trylock+0x42/0x42
[    7.373223]  [<ffffffff813ef2e0>] ? _raw_spin_unlock+0x23/0x36
[    7.373229]  [<ffffffff8113ea7b>] spin_unlock+0x9/0xb
[    7.373235]  [<ffffffff8113fd25>] dput+0xd9/0xf8
[    7.373241]  [<ffffffff8113685e>] path_put+0x13/0x20
[    7.373247]  [<ffffffff8113a6f3>] do_last+0x925/0xa0d
[    7.373253]  [<ffffffff81137fa4>] ? inode_permission+0x40/0x42
[    7.373259]  [<ffffffff8113a89c>] path_openat+0xc1/0x325
[    7.373265]  [<ffffffff8113ae0c>] do_filp_open+0x33/0x81
[    7.373271]  [<ffffffff811455bd>] ? __alloc_fd+0x169/0x17b
[    7.373279]  [<ffffffff8112d78f>] do_sys_open+0x67/0xf4
[    7.373285]  [<ffffffff8112d839>] SyS_open+0x1d/0x1f
[    7.373290]  [<ffffffff813f5369>] system_call_fastpath+0x16/0x1b
[    7.373294] ---[ end trace 78bba0b9776072a9 ]---
[    7.538936] fbcon: inteldrmfb (fb0) is primary device
[    7.539446] Console: switching consoles 2-6 to frame buffer device
[    7.539463] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[    7.539468] i915 0000:00:02.0: registered panic notifier

A clue?

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