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Along a module load error path, we may try to cleanup the powercontext even before we have allocated it. Reorganising GT powermanagement is an on going process, so for simplicity handle it. [ 522.733832] WARN_ON(!dev_priv->vlv_pctx) [ 522.733986] WARNING: CPU: 1 PID: 3856 at drivers/gpu/drm/i915/intel_pm.c:7350 intel_cleanup_gt_powersave+0x5f/0x70 [i915] [ 522.733991] Modules linked in: i915(+) vgem snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic btusb btrtl btbcm btintel intel_powerclamp coretemp crct10dif_pclmul crc32_pclmul bluetooth snd_hda_codec ghash_clmulni_intel snd_hwdep snd_hda_core ecdh_generic lpc_ich r8169 snd_pcm mii i2c_hid prime_numbers [last unloaded: i915] [ 522.734105] CPU: 1 PID: 3856 Comm: drv_module_relo Tainted: G U 4.18.0-rc4-CI-CI_DRM_4474+ #1 [ 522.734110] Hardware name: \xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff \xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff/DN2820FYK, BIOS FYBYT10H.86A.0059.2017.0607.2130 06/07/2017 [ 522.734193] RIP: 0010:intel_cleanup_gt_powersave+0x5f/0x70 [i915] [ 522.734197] Code: 00 74 0d 48 c7 83 68 a6 00 00 00 00 00 00 eb c8 e8 36 6f 37 e1 eb ec 48 c7 c6 c5 7a 3d a0 48 c7 c7 b5 78 3d a0 e8 71 04 e0 e0 <0f> 0b eb aa 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 f3 c3 0f 1f 40 [ 522.734445] RSP: 0018:ffffc900004f3af0 EFLAGS: 00010282 [ 522.734453] RAX: 0000000000000000 RBX: ffff880106360000 RCX: 0000000000000001 [ 522.734458] RDX: 0000000080000001 RSI: ffffffff820c65c4 RDI: 00000000ffffffff [ 522.734463] RBP: ffff880106360000 R08: 000000009f79baee R09: 0000000000000000 [ 522.734467] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88013b3133f8 [ 522.734472] R13: 00000000ffffffed R14: ffff880106360d58 R15: ffff88013b3133f8 [ 522.734477] FS: 00007f43f70af980(0000) GS:ffff88013fd00000(0000) knlGS:0000000000000000 [ 522.734481] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 522.734486] CR2: 000055a13a787580 CR3: 00000001325e6000 CR4: 00000000001006e0 [ 522.734490] Call Trace: [ 522.734595] intel_modeset_cleanup+0xcf/0x140 [i915] [ 522.734682] i915_driver_load+0xc85/0x10a0 [i915] [ 522.734694] ? _raw_spin_unlock_irqrestore+0x4c/0x60 [ 522.734703] ? trace_hardirqs_on_caller+0xe0/0x1b0 [ 522.734790] i915_pci_probe+0x29/0x90 [i915] [ 522.734801] pci_device_probe+0xa1/0x130 [ 522.734813] driver_probe_device+0x306/0x480 [ 522.734824] __driver_attach+0xdb/0x100 [ 522.734830] ? driver_probe_device+0x480/0x480 [ 522.734836] ? driver_probe_device+0x480/0x480 [ 522.734844] bus_for_each_dev+0x74/0xc0 [ 522.734855] bus_add_driver+0x15f/0x250 [ 522.734863] ? 0xffffffffa0793000 [ 522.734870] driver_register+0x56/0xe0 [ 522.734877] ? 0xffffffffa0793000 [ 522.734883] do_one_initcall+0x58/0x370 [ 522.734893] ? do_init_module+0x1d/0x1ea [ 522.734900] ? rcu_read_lock_sched_held+0x6f/0x80 [ 522.734906] ? kmem_cache_alloc_trace+0x282/0x2e0 [ 522.734918] do_init_module+0x56/0x1ea [ 522.734927] load_module+0x2435/0x2b20 [ 522.734965] ? __se_sys_finit_module+0xd3/0xf0 [ 522.734972] __se_sys_finit_module+0xd3/0xf0 [ 522.734995] do_syscall_64+0x55/0x190 [ 522.735003] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 522.735009] RIP: 0033:0x7f43f675d839 [ 522.735014] 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 [ 522.735260] RSP: 002b:00007ffe69384238 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 522.735269] RAX: ffffffffffffffda RBX: 000056100e387090 RCX: 00007f43f675d839 [ 522.735273] RDX: 0000000000000000 RSI: 000056100e37bff0 RDI: 0000000000000003 [ 522.735278] RBP: 000056100e37bff0 R08: 0000000000000000 R09: 0000000000000000 [ 522.735282] R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000 [ 522.735286] R13: 000056100e37c890 R14: 0000000000000020 R15: 0000000000000027 [ 522.735309] irq event stamp: |
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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.