[Bug 71208] New: [HSW]module_reload segfault

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71208

          Priority: medium
            Bug ID: 71208
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [HSW]module_reload segfault
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: huax.lu at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 88587
  --> https://bugs.freedesktop.org/attachment.cgi?id=88587&action=edit
dmesg

System Environment:
--------------------------
Platform: Haswell
Kernel:   (drm-intel-nightly)265a909ea074a346af0c40e41c7da10464046277

Bug detailed description:
-----------------------------
It happens on haswell with -nightly and drm-next branch. It doesn't happens on
-queued and -fixes kernel.

Run the first cycle, It causes call trace:
output:
module successfully unloaded
module successfully loaded again

dmesg:
[   31.122255] ------------[ cut here ]------------
[   31.122373] WARNING: CPU: 2 PID: 3913 at fs/sysfs/file.c:498
sysfs_attr_ns+0x25/0x8c()
[   31.122545] sysfs: kobject \xffffffd0\xffffff85\xffffff85\x04\xffffff9e
without dirent
[   31.122660] Modules linked in: netconsole configfs ipv6 dm_mod
snd_hda_codec_realtek pcspkr snd_hda_codec_hdmi i2c_i801 iTCO_wdt
iTCO_vendor_support lpc_ich mfd_core snd_hda_codec snd_hwdep snd_pcm
snd_page_alloc snd_timer snd soundcore acpi_cpufreq i915(-) video button
drm_kms_helper drm freq_table [last unloaded: snd_hda_intel]
[   31.124140] CPU: 2 PID: 3913 Comm: rmmod Not tainted
3.12.0-rc7_nightlytop_265a90_20131104_+ #2203
[   31.124317] Hardware name: Intel Corporation Shark Bay Client
platform/Flathead Creek Crb, BIOS HSWLPTU1.86C.0131.R03.1307262359 07/26/2013
[   31.124498]  0000000000000000 0000000000000009 ffffffff8170464c
ffff880243723cd8
[   31.124827]  ffffffff8103319e ffff880200000000 ffffffff8112f8b7
ffff880243723ca8
[   31.125153]  ffffffff81adc2b0 ffff88009e073610 ffff88009e0c7a00
ffff88009e13db40
[   31.125477] Call Trace:
[   31.125579]  [<ffffffff8170464c>] ? dump_stack+0x41/0x51
[   31.125693]  [<ffffffff8103319e>] ? warn_slowpath_common+0x73/0x8b
[   31.125809]  [<ffffffff8112f8b7>] ? sysfs_attr_ns+0x25/0x8c
[   31.125916]  [<ffffffff8103324e>] ? warn_slowpath_fmt+0x45/0x4a
[   31.126028]  [<ffffffff8112f8b7>] ? sysfs_attr_ns+0x25/0x8c
[   31.126142]  [<ffffffff8112f934>] ? sysfs_remove_file+0x16/0x32
[   31.126255]  [<ffffffff8136ab85>] ? device_del+0x114/0x17a
[   31.126368]  [<ffffffff8136abf4>] ? device_unregister+0x9/0x12
[   31.126487]  [<ffffffffa000befc>] ? drm_sysfs_connector_remove+0x7d/0x89
[drm]
[   31.126672]  [<ffffffffa00905fc>] ? intel_modeset_cleanup+0xb9/0xe2 [i915]
[   31.126796]  [<ffffffffa00628ca>] ? i915_driver_unload+0xb6/0x2a7 [i915]
[   31.126909]  [<ffffffffa000954e>] ? drm_dev_unregister+0x21/0xd0 [drm]
[   31.127025]  [<ffffffffa0009ba6>] ? drm_put_dev+0x48/0x51 [drm]
[   31.127137]  [<ffffffff812eb190>] ? pci_device_remove+0x24/0x48
[   31.127251]  [<ffffffff8136d34f>] ? __device_release_driver+0x68/0xc1
[   31.127364]  [<ffffffff8136da29>] ? driver_detach+0x6e/0x99
[   31.127476]  [<ffffffff8136d1ab>] ? bus_remove_driver+0x78/0xb9
[   31.127590]  [<ffffffff812eb2c5>] ? pci_unregister_driver+0x17/0x75
[   31.127703]  [<ffffffffa000b210>] ? drm_pci_exit+0x3b/0x72 [drm]
[   31.127817]  [<ffffffff81077d1d>] ? SyS_delete_module+0x1a3/0x219
[   31.127929]  [<ffffffff81709ef2>] ? page_fault+0x22/0x30
[   31.128039]  [<ffffffff8170ebe2>] ? system_call_fastpath+0x16/0x1b
[   31.128152] ---[ end trace 67e4404f3dd63a8a ]---


Run the 2nd cycle, It segfault.
output:
./module_reload: line 27: 18675 Segmentation fault      rmmod i915
WARNING: i915.ko still loaded!

Reproduce steps:
----------------------------
1. ./module_reload

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