[Bug 88433] New: [all Regression]igt/drv_module_reload causes system hang

Wed Jan 14 18:33:53 PST 2015

https://bugs.freedesktop.org/show_bug.cgi?id=88433

            Bug ID: 88433
           Summary: [all Regression]igt/drv_module_reload causes system
                    hang
           Product: DRI
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: high
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: huax.lu at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 112260
  --> https://bugs.freedesktop.org/attachment.cgi?id=112260&action=edit
dmesg

==System Environment==
--------------------------
Regression: yes
good commit: 985850bd145655d10dfcd5a03a3fc38540794ca7
bad commit:cd52471999ef08bca35568525c1d85d883ffedb6

Non-working platforms: all

==kernel==
--------------------------
drm-intel-nightly/9c4bdce37d09c0682f04bb5e6d0567def5c8d786
commit 9c4bdce37d09c0682f04bb5e6d0567def5c8d786
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Tue Jan 13 23:27:51 2015 +0100

    drm-intel-nightly: 2015y-01m-13d-22h-27m-23s UTC integration manifest

==Bug detailed description==
-----------------------------
It causes system hang on drm-intel-nightly and drm-intel-next-queued kernel,
works well on drm-intel-fixes kernel.

output:
unbinding /sys/class/vtconsole/vtcon0/: (M) frame buffer device

dmesg
[   47.332841] BUG: unable to handle kernel NULL pointer dereference at
0000000000000001
[   47.332847] IP: [<ffffffff8110e90b>] kmem_cache_alloc+0xd9/0x113
[   47.332853] PGD 1195a5067 PUD 11937d067 PMD 0
[   47.332856] Oops: 0000 [#1] SMP
[   47.332860] Modules linked in: netconsole configfs ip6table_filter
ip6_tables ipv6 iptable_filter ip_tables ebtable_nat ebtables x_tables dm_mod
snd_hda_codec_realtek snd_hda_codec_generic snd_hda_codec_hdmi iTCO_wdt
iTCO_vendor_support dcdbas i2c_i801 pcspkr serio_raw snd_hda_controller
snd_hda_codec snd_hwdep lpc_ich shpchp mfd_core snd_pcm snd_timer snd soundcore
battery acpi_cpufreq i915(-) button video drm_kms_helper drm cfbfillrect
cfbimgblt cfbcopyarea [last unloaded: snd_hda_intel]
[   47.332896] CPU: 3 PID: 1078 Comm: kworker/u16:3 Not tainted
3.19.0-rc4_drm-intel-nightly_9c4bdc_20150114+ #410
[   47.332899] Hardware name: Dell Inc. OptiPlex 9020/0DNKMN, BIOS A03
09/17/2013
[   47.332904] Workqueue: khelper __call_usermodehelper
[   47.332906] task: ffff880119690000 ti: ffff880114490000 task.ti:
ffff880114490000
[   47.332908] RIP: 0010:[<ffffffff8110e90b>]  [<ffffffff8110e90b>]
kmem_cache_alloc+0xd9/0x113
[   47.332912] RSP: 0018:ffff880114493c18  EFLAGS: 00010282
[   47.332926] RAX: 0000000000000000 RBX: ffff880115d59de0 RCX:
0000000000001282
[   47.332928] RDX: 0000000000001281 RSI: 00000000000000d0 RDI:
ffff88011a003900
[   47.332930] RBP: 0000000000000001 R08: 0000000000015520 R09:
ffffffff8104a2ae
[   47.332932] R10: ffff8800db07f4d8 R11: ffffffff81bd1d18 R12:
ffff88011a003900
[   47.332934] R13: 00000000000000d0 R14: ffffffff8104f7cb R15:
0000000000800111
[   47.332936] FS:  0000000000000000(0000) GS:ffff88011eac0000(0000)
knlGS:0000000000000000
[   47.332938] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   47.332940] CR2: 0000000000000001 CR3: 00000001167d0000 CR4:
00000000001407e0
[   47.332994] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[   47.332996] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
0000000000000400
[   47.332998] Stack:
[   47.332999]  0000000000000000 ffff880115d59de0 ffffffff81bc1e00
0000000000000000
[   47.333003]  ffff8800025e4000 ffff8800daecc000 0000000000800111
ffffffff8104f7cb
[   47.333007]  ffff880114493d54 ffffffff8110e859 0000000000000000
0000000000000000
[   47.333011] Call Trace:
[   47.333014]  [<ffffffff8104f7cb>] ? alloc_pid+0x22/0x3b7
[   47.333017]  [<ffffffff8110e859>] ? kmem_cache_alloc+0x27/0x113
[   47.333020]  [<ffffffff8110e859>] ? kmem_cache_alloc+0x27/0x113
[   47.333024]  [<ffffffff8103a948>] ? copy_process.part.36+0xd98/0x160a
[   47.333027]  [<ffffffff8104a2ae>] ? __call_usermodehelper+0x3e/0x3e
[   47.333030]  [<ffffffff8103b337>] ? do_fork+0xb4/0x2e0
[   47.333032]  [<ffffffff8103b581>] ? kernel_thread+0x1e/0x20
[   47.333035]  [<ffffffff8104a29f>] ? __call_usermodehelper+0x2f/0x3e
[   47.333038]  [<ffffffff8104d108>] ? process_one_work+0x1ad/0x31a
[   47.333041]  [<ffffffff8104d4ef>] ? worker_thread+0x255/0x350
[   47.333044]  [<ffffffff8104d29a>] ? process_scheduled_works+0x25/0x25
[   47.333046]  [<ffffffff81050dc2>] ? kthread+0xc5/0xcd
[   47.333049]  [<ffffffff81050cfd>] ? kthread_freezable_should_stop+0x40/0x40
[   47.333053]  [<ffffffff8179ef2c>] ? ret_from_fork+0x7c/0xb0
[   47.333056]  [<ffffffff81050cfd>] ? kthread_freezable_should_stop+0x40/0x40
[   47.333058] Code: e9 4d 89 f8 4c 89 f1 48 89 ea 48 89 de 41 ff 14 24 49 83
c4 10 49 83 3c 24 00 eb 36 eb 38 49 63 44 24 20 4d 8b 04 24 48 8d 4a 01 <48> 8b
5c 05 00 48 89 e8 65 49 0f c7 08 0f 94 c0 84 c0 0f 85 78
[   47.333098] RIP  [<ffffffff8110e90b>] kmem_cache_alloc+0xd9/0x113
[   47.333101]  RSP <ffff880114493c18>
[   47.333102] CR2: 0000000000000001
[   47.333105] ---[ end trace 0e850f2f346708bd ]---


==Reproduce steps==
---------------------------- 
1. ./drv_module_reload

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