On 10 August 2017 at 18:57, Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> wrote:
> Another case where we need to call sysfs_attr_init() to setup the
> internal lockdep class prior to use:
>
> [ 9.325229] BUG: key ffff880168bc7bb0 not in .data!
> [ 9.325240] DEBUG_LOCKS_WARN_ON(1)
> [ 9.325250] ------------[ cut here ]------------
> [ 9.325280] WARNING: CPU: 1 PID: 275 at kernel/locking/lockdep.c:3156 lockdep_init_map+0x1b2/0x1c0
> [ 9.325301] Modules linked in: intel_powerclamp(+) coretemp crct10dif_pclmul crc32_pclmul ghash_clmulni_intel i915(+) snd_hda_intel snd_hda_codec snd_hwdep r8169 mii snd_hda_core snd_pcm prime_numbers i2c_hid pinctrl_geminilake pinctrl_intel
> [ 9.325375] CPU: 1 PID: 275 Comm: modprobe Not tainted 4.13.0-rc4-CI-Trybot_1040+ #1
> [ 9.325395] Hardware name: Intel Corp. Geminilake/GLK RVP2 LP4SD (07), BIOS GELKRVPA.X64.0045.B51.1704281422 04/28/2017
> [ 9.325422] task: ffff8801721a4ec0 task.stack: ffffc900001dc000
> [ 9.325440] RIP: 0010:lockdep_init_map+0x1b2/0x1c0
> [ 9.325456] RSP: 0018:ffffc900001dfa10 EFLAGS: 00010282
> [ 9.325473] RAX: 0000000000000016 RBX: ffff880168d54b80 RCX: 0000000000000000
> [ 9.325488] RDX: 0000000080000001 RSI: 0000000000000001 RDI: ffffffff810f0800
> [ 9.325505] RBP: ffffc900001dfa30 R08: 0000000000000001 R09: 0000000000000000
> [ 9.325521] R10: 0000000000000000 R11: 0000000000000000 R12: ffff880168bc7bb0
> [ 9.325537] R13: 0000000000000000 R14: ffff880168bc7b98 R15: ffffffff81a263a0
> [ 9.325554] FS: 00007fb60c3fd700(0000) GS:ffff88017fc80000(0000) knlGS:0000000000000000
> [ 9.325574] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 9.325588] CR2: 0000006582777d80 CR3: 000000016d818000 CR4: 00000000003406e0
> [ 9.325604] Call Trace:
> [ 9.325618] __kernfs_create_file+0x76/0xe0
> [ 9.325632] sysfs_add_file_mode_ns+0x8a/0x1a0
> [ 9.325646] internal_create_group+0xea/0x2c0
> [ 9.325660] sysfs_create_group+0x13/0x20
> [ 9.325737] i915_perf_register+0xde/0x220 [i915]
> [ 9.325800] i915_driver_load+0xa77/0x16c0 [i915]
> [ 9.325863] i915_pci_probe+0x37/0x90 [i915]
> [ 9.325880] pci_device_probe+0xa8/0x130
> [ 9.325894] driver_probe_device+0x29c/0x450
> [ 9.325908] __driver_attach+0xe3/0xf0
> [ 9.325922] ? driver_probe_device+0x450/0x450
> [ 9.325935] bus_for_each_dev+0x62/0xa0
> [ 9.325948] driver_attach+0x1e/0x20
> [ 9.325960] bus_add_driver+0x173/0x270
> [ 9.325974] driver_register+0x60/0xe0
> [ 9.325986] __pci_register_driver+0x60/0x70
> [ 9.326044] i915_init+0x6f/0x78 [i915]
> [ 9.326066] ? 0xffffffffa024e000
> [ 9.326079] do_one_initcall+0x43/0x170
> [ 9.326094] ? rcu_read_lock_sched_held+0x7a/0x90
> [ 9.326109] ? kmem_cache_alloc_trace+0x261/0x2d0
> [ 9.326124] do_init_module+0x5f/0x206
> [ 9.326137] load_module+0x2561/0x2da0
> [ 9.326150] ? show_coresize+0x30/0x30
> [ 9.326165] ? kernel_read_file+0x105/0x190
> [ 9.326180] SyS_finit_module+0xc1/0x100
> [ 9.326192] ? SyS_finit_module+0xc1/0x100
> [ 9.326210] entry_SYSCALL_64_fastpath+0x1c/0xb1
> [ 9.326223] RIP: 0033:0x7fb60bf359f9
> [ 9.326234] RSP: 002b:00007fff92b47c48 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
> [ 9.326255] RAX: ffffffffffffffda RBX: ffffffff814898a3 RCX: 00007fb60bf359f9
> [ 9.326271] RDX: 0000000000000000 RSI: 00000028a9ceef8b RDI: 0000000000000000
> [ 9.326287] RBP: ffffc900001dff88 R08: 0000000000000000 R09: 0000000000000000
> [ 9.326303] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000040000
> [ 9.326319] R13: 00000028aaef2a70 R14: 0000000000000000 R15: 00000028aaeee5d0
> [ 9.326339] ? __this_cpu_preempt_check+0x13/0x20
> [ 9.326353] Code: f1 39 00 85 c0 0f 84 38 ff ff ff 83 3d 9f 44 ce 01 00 0f 85 2b ff ff ff 48 c7 c6 b2 a2 c7 81 48 c7 c7 53 40 c5 81 e8 3f 82 01 00 <0f> ff e9 11 ff ff ff 0f 1f 80 00 00 00 00 55 31 c9 31 d2 31 f6
>
> Fixes: 701f8231a2fe ("drm/i915/perf: prune OA configs")
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Lionel Landwerlin <lionel.g.landwerlin@xxxxxxxxx>
> Cc: Matthew Auld <matthew.auld@xxxxxxxxx>
+ Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@xxxxxxxxx>
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