[Bug 103927] [CI][BXT only] igt@* - incomplete timeout/system hang

Tue Dec 4 07:55:15 UTC 2018

https://bugs.freedesktop.org/show_bug.cgi?id=103927

--- Comment #23 from Stanislav Lisovskiy <stanislav.lisovskiy at intel.com> ---
(In reply to Francesco Balestrieri from comment #22)
> Stan, did you figure out anything from the latest logs?

There is a NULL pointer deref in  do_remove_conflicting_framebuffers function:

<4>[  353.865901] general protection fault: 0000 [#1] PREEMPT SMP PTI
<4>[  353.865920] CPU: 2 PID: 3280 Comm: i915_module_loa Tainted: G     U      
     4.20.0-rc3-CI-CI_DRM_5198+ #1
<4>[  353.865938] Hardware name: To Be Filled By O.E.M. To Be Filled By
O.E.M./J4205-ITX, BIOS P1.10 09/29/2016
<4>[  353.865962] RIP: 0010:do_remove_conflicting_framebuffers+0x55/0x180
<4>[  353.865975] Code: ee 41 89 ef 48 85 c0 74 53 f6 40 0a 08 74 4d 4d 85 ed
4c 8b a0 78 04 00 00 74 20 4d 85 e4 74 1b 41 8b 4d 00 31 db 85 c9 74 11 <41> 8b
14 24 85 d2 75 45 83 c3 01 41 39 5d 00 77 ef 4d 85 e4 74 1c
<4>[  353.866006] RSP: 0018:ffffc900002bfa58 EFLAGS: 00010202
<4>[  353.866017] RAX: ffff888275e7e678 RBX: 0000000000000000 RCX:
0000000000000001
<4>[  353.866031] RDX: 0000000000000001 RSI: ffffffffa05a2dc2 RDI:
ffff88825c0e6178
<4>[  353.866045] RBP: 0000000000000000 R08: 00000000cfaa903d R09:
0000000000000001
<4>[  353.866058] R10: ffffc900002bfac0 R11: ffffffff820e2810 R12:
6b6b6b6b6b6b6b6b
<4>[  353.866071] R13: ffff88825c0e6178 R14: ffffffff82339400 R15:
0000000000000000
<4>[  353.866086] FS:  00007f71e4e18980(0000) GS:ffff888277f00000(0000)
knlGS:0000000000000000
<4>[  353.866102] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
<4>[  353.866113] CR2: 000055cd8d020a90 CR3: 0000000269ca8000 CR4:
00000000003406e0
<4>[  353.866127] Call Trace:
<4>[  353.866141]  remove_conflicting_framebuffers+0x2d/0xc0
<4>[  353.866244]  i915_driver_load+0x845/0x1550 [i915]
<4>[  353.866262]  ? _raw_spin_unlock_irqrestore+0x4c/0x60
<4>[  353.866280]  ? lockdep_hardirqs_on+0xe0/0x1b0
<4>[  353.866356]  i915_pci_probe+0x29/0xa0 [i915]
<4>[  353.866369]  pci_device_probe+0xa1/0x130
<4>[  353.866383]  really_probe+0xf3/0x3e0
<4>[  353.866394]  driver_probe_device+0x10a/0x120
<4>[  353.866406]  __driver_attach+0xdb/0x100
<4>[  353.866416]  ? driver_probe_device+0x120/0x120
<4>[  353.866427]  ? driver_probe_device+0x120/0x120
<4>[  353.866438]  bus_for_each_dev+0x74/0xc0
<4>[  353.866449]  bus_add_driver+0x15f/0x250
<4>[  353.866460]  ? 0xffffffffa0730000
<4>[  353.866470]  driver_register+0x56/0xe0
<4>[  353.866479]  ? 0xffffffffa0730000
<4>[  353.866489]  do_one_initcall+0x58/0x2e0
<4>[  353.866501]  ? do_init_module+0x1d/0x1ea
<4>[  353.866512]  ? rcu_read_lock_sched_held+0x6f/0x80
<4>[  353.866525]  ? kmem_cache_alloc_trace+0x264/0x290
<4>[  353.866538]  do_init_module+0x56/0x1ea
<4>[  353.866549]  load_module+0x2714/0x29f0
<4>[  353.866570]  ? __se_sys_finit_module+0xd3/0xf0
<4>[  353.866581]  __se_sys_finit_module+0xd3/0xf0
<4>[  353.866597]  do_syscall_64+0x55/0x190
<4>[  353.866609]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
<4>[  353.866621] RIP: 0033:0x7f71e44c1839
<4>[  353.866631] Code: 00 f3 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48
89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d
01 f0 ff ff 73 01 c3 48 8b 0d 1f f6 2c 00 f7 d8 64 89 01 48
<4>[  353.866662] RSP: 002b:00007fff86e10c38 EFLAGS: 00000246 ORIG_RAX:
0000000000000139
<4>[  353.866678] RAX: ffffffffffffffda RBX: 0000563533cef0b0 RCX:
00007f71e44c1839
<4>[  353.866691] RDX: 0000000000000000 RSI: 0000563533ce91f0 RDI:
0000000000000005
<4>[  353.866705] RBP: 0000563533ce91f0 R08: 0000000000000000 R09:
0000000000000000
<4>[  353.866718] R10: 0000000000000005 R11: 0000000000000246 R12:
0000000000000000
<4>[  353.866732] R13: 0000563533cece30 R14: 0000000000000020 R15:
0000000000000016
<4>[  353.866751] Modules linked in: i915(+) vgem snd_hda_codec_hdmi
snd_hda_codec_realtek snd_hda_codec_generic x86_pkg_temp_thermal coretemp
crct10dif_pclmul crc32_pclmul ghash_clmulni_intel i2c_i801 lpc_ich r8169
snd_hda_codec snd_hwdep snd_hda_core mei_me snd_pcm pinctrl_broxton mei
pinctrl_intel prime_numbers [last unloaded: i915]

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