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7ab87ede50
Following intel_gvt_init() failure, we missed unwinding our setup
leaving pointers dangling past the module unload. For our example, the
pm_qos:
[ 441.057615] top: 000000006b3baf1c, n: 0000000054d8ef33, p: 0000000097cdf1a2
prev: 0000000054d8ef33, n: 0000000097cdf1a2, p: 000000006b3baf1c
next: 0000000097cdf1a2, n: 000000006de8fc8b, p: 0000000081087253
[ 441.057627] WARNING: CPU: 4 PID: 9277 at lib/plist.c:42 plist_check_prev_next+0x2d/0x40
[ 441.057628] Modules linked in: i915(+) vgem snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic x86_pkg_temp_thermal intel_powerclamp coretemp crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_hda_codec snd_hwdep snd_hda_core e1000e snd_pcm mei_me mei prime_numbers [last unloaded: i915]
[ 441.057652] CPU: 4 PID: 9277 Comm: drv_selftest Tainted: G U 4.18.0-rc4-CI-CI_DRM_4464+ #1
[ 441.057653] Hardware name: System manufacturer System Product Name/Z170 PRO GAMING, BIOS 3402 04/26/2017
[ 441.057656] RIP: 0010:plist_check_prev_next+0x2d/0x40
[ 441.057657] Code: 08 48 39 f0 74 2b 49 89 f0 48 8b 4f 08 50 ff 32 52 48 89 fe 41 ff 70 08 48 8b 17 48 c7 c7 d8 ae 14 82 4d 8b 08 e8 63 0e 76 ff <0f> 0b 48 83 c4 20 c3 48 39 10 75 d0 f3 c3 0f 1f 44 00 00 41 54 55
[ 441.057717] RSP: 0018:ffffc900003a3a68 EFLAGS: 00010082
[ 441.057720] RAX: 0000000000000000 RBX: ffff8802193978c0 RCX: 0000000000000002
[ 441.057721] RDX: 0000000080000002 RSI: ffffffff820c65a4 RDI: 00000000ffffffff
[ 441.057722] RBP: ffff8802193978c0 R08: 0000000000000000 R09: 0000000000000001
[ 441.057724] R10: ffffc900003a3a70 R11: 0000000000000000 R12: ffffffff82243de0
[ 441.057725] R13: ffffffff82243de0 R14: ffff88021a6c78c0 R15: 0000000077359400
[ 441.057726] FS: 00007fc23a4a9980(0000) GS:ffff880236d00000(0000) knlGS:0000000000000000
[ 441.057728] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 441.057729] CR2: 0000563e4503d038 CR3: 0000000138f86005 CR4: 00000000003606e0
[ 441.057730] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 441.057731] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 441.057732] Call Trace:
[ 441.057736] plist_check_list+0x2e/0x40
[ 441.057738] plist_add+0x23/0x130
[ 441.057743] pm_qos_update_target+0x1bd/0x2f0
[ 441.057771] i915_driver_load+0xec4/0x1060 [i915]
[ 441.057775] ? trace_hardirqs_on_caller+0xe0/0x1b0
[ 441.057800] i915_pci_probe+0x29/0x90 [i915]
[ 441.057804] pci_device_probe+0xa1/0x130
[ 441.057807] driver_probe_device+0x306/0x480
[ 441.057810] __driver_attach+0xdb/0x100
[ 441.057812] ? driver_probe_device+0x480/0x480
[ 441.057813] ? driver_probe_device+0x480/0x480
[ 441.057816] bus_for_each_dev+0x74/0xc0
[ 441.057819] bus_add_driver+0x15f/0x250
[ 441.057821] ? 0xffffffffa0696000
[ 441.057823] driver_register+0x56/0xe0
[ 441.057825] ? 0xffffffffa0696000
[ 441.057827] do_one_initcall+0x58/0x370
[ 441.057830] ? do_init_module+0x1d/0x1ea
[ 441.057832] ? rcu_read_lock_sched_held+0x6f/0x80
[ 441.057834] ? kmem_cache_alloc_trace+0x282/0x2e0
[ 441.057838] do_init_module+0x56/0x1ea
[ 441.057841] load_module+0x2435/0x2b20
[ 441.057852] ? __se_sys_finit_module+0xd3/0xf0
[ 441.057854] __se_sys_finit_module+0xd3/0xf0
[ 441.057861] do_syscall_64+0x55/0x190
[ 441.057863] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 441.057865] RIP: 0033:0x7fc239d75839
[ 441.057866] 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
[ 441.057927] RSP: 002b:00007fffb7825d38 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
[ 441.057930] RAX: ffffffffffffffda RBX: 0000563e45035dd0 RCX: 00007fc239d75839
[ 441.057931] RDX: 0000000000000000 RSI: 0000563e4502f8a0 RDI: 0000000000000004
[ 441.057932] RBP: 0000563e4502f8a0 R08: 0000000000000004 R09: 0000000000000000
[ 441.057933] R10: 00007fffb7825ea0 R11: 0000000000000246 R12: 0000000000000000
[ 441.057934] R13: 0000563e4502f690 R14: 0000000000000000 R15: 000000000000003f
[ 441.057940] irq event stamp: 231338
[ 441.057943] hardirqs last enabled at (231337): [<ffffffff8193e3fc>] _raw_spin_unlock_irqrestore+0x4c/0x60
[ 441.057944] hardirqs last disabled at (231338): [<ffffffff8193e26d>] _raw_spin_lock_irqsave+0xd/0x50
[ 441.057947] softirqs last enabled at (231024): [<ffffffff81c0034f>] __do_softirq+0x34f/0x505
[ 441.057949] softirqs last disabled at (231005): [<ffffffff8108c7b9>] irq_exit+0xa9/0xc0
[ 441.057951] WARNING: CPU: 4 PID: 9277 at lib/plist.c:42 plist_check_prev_next+0x2d/0x40
v2: Add a load failure point to intel_gvt_init() so that we always
exercise this path in future.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107129
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Matthew Auld <matthew.auld@intel.com>
Cc: Michał Winiarski <michal.winiarski@intel.com>
Reviewed-by: Michał Winiarski <michal.winiarski@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180710143821.1889-1-chris@chris-wilson.co.uk
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.