[Bug 66610] igt/module_reload fails and causes many cases fail

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=66610

--- Comment #12 from Daniel Vetter <daniel at ffwll.ch> ---
Ok, I've run module reload in an endless-loop and the thing indeed eventually
crashed, with some neat fail in dmesg (this  is on my gm45 laptop):

[11332.369834] ------------[ cut here ]------------
[11332.369900] WARNING: at include/linux/kref.h:47 kref_get+0x2d/0x36()
[11332.369962] Modules linked in: i915(+) drm_kms_helper drm cpufreq_userspace
cpufreq_powersave cpufre
q_conservative cpufreq_stats parport_pc ppdev lp parport bnep rfcomm bluetooth
binfmt_misc uinput loop 
firewire_sbp2 fuse b43 bcma mac80211 snd_hda_codec_hdmi cfg80211
snd_hda_codec_idt snd_hda_intel snd_hd
a_codec rfkill rng_core i2c_algo_bit snd_hwdep snd_pcm snd_page_alloc snd_seq
ssb pcmcia acpi_cpufreq s
nd_seq_device snd_timer hid_generic snd dell_wmi sparse_keymap yenta_socket
pcmcia_rsrc mperf iTCO_wdt 
processor usbhid iTCO_vendor_support lpc_ich psmouse video hid i2c_i801 button
battery ac pcmcia_core d
ell_laptop wmi dcdbas pcspkr serio_raw mfd_core evdev i2c_core soundcore ext4
crc16 mbcache jbd2 dm_mod
 sr_mod sd_mod cdrom crc_t10dif sdhci_pci sdhci firewire_ohci firewire_core
mmc_core crc_itu_t ahci lib
ahci libata scsi_mod uhci_hcd ehci_pci ehci_hcd usbcore usb_common thermal
thermal_sys [last unloaded: 
drm]  
[11332.374334] CPU: 0 PID: 28004 Comm: modprobe Not tainted 3.10.0-rc7+ #174
[11332.374399] Hardware name: Dell Inc. Latitude E6400                 
/0W620R, BIOS A14 05/11/2009
[11332.374475]  0000000000000000 ffff880210685728 ffffffff81397d34
ffff880210685760
[11332.374716]  ffffffff810308d8 0000000000000000 ffff8802106857d0
ffff880211f865a8
[11332.374953]  ffff88021212ca28 0000000000000000 ffff880210685770
ffffffff8103098f
[11332.375191] Call Trace:
[11332.375253]  [<ffffffff81397d34>] dump_stack+0x19/0x1b
[11332.375316]  [<ffffffff810308d8>] warn_slowpath_common+0x60/0x78
[11332.375378]  [<ffffffff8103098f>] warn_slowpath_null+0x15/0x17
[11332.375441]  [<ffffffff8138132a>] kref_get+0x2d/0x36
[11332.375504]  [<ffffffff81381620>] klist_next+0x70/0xa6
[11332.375566]  [<ffffffff811eb3b7>] ? pci_do_find_bus+0x4a/0x4a
[11332.375629]  [<ffffffff8126f01a>] next_device+0x9/0x18
[11332.375690]  [<ffffffff8126f1c4>] bus_find_device+0x52/0x8c
[11332.375751]  [<ffffffff811eb59b>] pci_get_dev_by_id+0x59/0x7f
[11332.375812]  [<ffffffff811eb6a4>] pci_get_class+0x48/0x4a
[11332.375913]  [<ffffffffa069e2d5>] intel_dsm_detect+0x5f/0x150 [i915]
[11332.376006]  [<ffffffffa069e3cf>] intel_register_dsm_handler+0x9/0xb [i915]
[11332.376118]  [<ffffffffa064fbf4>] i915_driver_load+0xa42/0xcc1 [i915]
[11332.376209]  [<ffffffffa033761f>] drm_get_pci_dev+0x161/0x274 [drm]
[11332.376293]  [<ffffffffa064c65e>] i915_pci_probe+0x4e/0x58 [i915]
[11332.376358]  [<ffffffff811eadbf>] local_pci_probe+0x39/0x61
[11332.376422]  [<ffffffff811eaea6>] pci_device_probe+0xbf/0xe5
[11332.376483]  [<ffffffff812709d7>] driver_probe_device+0x98/0x1c4
[11332.376545]  [<ffffffff81270b97>] __driver_attach+0x5c/0x7e
[11332.376606]  [<ffffffff81270b3b>] ? __device_attach+0x38/0x38
[11332.376668]  [<ffffffff8126f0a1>] bus_for_each_dev+0x78/0x82
[11332.376729]  [<ffffffff812704d0>] driver_attach+0x19/0x1b
[11332.376792]  [<ffffffff812701a1>] bus_add_driver+0xf4/0x1fc
[11332.376854]  [<ffffffff81271073>] driver_register+0x87/0xf8
[11332.376915]  [<ffffffff811ea4e0>] __pci_register_driver+0x5b/0x5e
[11332.376980]  [<ffffffffa0481000>] ? 0xffffffffa0480fff
[11332.377050]  [<ffffffffa03377b8>] drm_pci_init+0x86/0xea [drm]
[11332.377113]  [<ffffffffa0481000>] ? 0xffffffffa0480fff
[11332.377190]  [<ffffffffa0481066>] i915_init+0x66/0x68 [i915]
[11332.377253]  [<ffffffff81000263>] do_one_initcall+0x7b/0x10f
[11332.377316]  [<ffffffff81081e4b>] load_module+0x1224/0x1dad
[11332.377377]  [<ffffffff8107ea80>] ? store_uevent+0x35/0x35
[11332.377440]  [<ffffffff810de1ac>] ? might_fault+0x3d/0x8b
[11332.377502]  [<ffffffff81082a74>] SyS_init_module+0xa0/0xaf
[11332.377565]  [<ffffffff813a2d92>] system_call_fastpath+0x16/0x1b
[11332.377626] ---[ end trace f64ad603e02a19b0 ]---

Two questions:
- Is the failure on your side 100% reproducible?
- Any backtraces in dmesg?

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