[linux-next-20170523] possible circular locking dependency detected

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Hello,

[    9.610781] ======================================================
[    9.610784] WARNING: possible circular locking dependency detected
[    9.610789] 4.12.0-rc2-next-20170523-dbg-dirty #231 Not tainted
[    9.610791] ------------------------------------------------------
[    9.610795] Xorg/341 is trying to acquire lock:
[    9.610798]  (cpu_hotplug_lock.rw_sem){++++++}, at: [<ffffffff8104c4ba>] apply_wqattrs_lock+0x9/0x19
[    9.610816] 
               but task is already holding lock:
[    9.610818]  (&dev_priv->mm_lock){+.+.+.}, at: [<ffffffff81312e75>] i915_gem_userptr_init__mmu_notifier+0x85/0x213
[    9.610834] 
               which lock already depends on the new lock.

[    9.610837] 
               the existing dependency chain (in reverse order) is:
[    9.610839] 
               -> #5 (&dev_priv->mm_lock){+.+.+.}:
[    9.610854]        lock_acquire+0x46/0x60
[    9.610861]        __mutex_lock+0x90/0x7b5
[    9.610867]        mutex_lock_nested+0x16/0x18
[    9.610872]        i915_gem_userptr_init__mmu_notifier+0x85/0x213
[    9.610878]        i915_gem_userptr_ioctl+0x1cd/0x2b6
[    9.610884]        drm_ioctl+0x258/0x373
[    9.610893]        vfs_ioctl+0x13/0x2f
[    9.610899]        do_vfs_ioctl+0x5eb/0x5fe
[    9.610905]        SyS_ioctl+0x3e/0x5c
[    9.610913]        entry_SYSCALL_64_fastpath+0x18/0xad
[    9.610915] 
               -> #4 (&mm->mmap_sem){++++++}:
[    9.610926]        lock_acquire+0x46/0x60
[    9.610933]        __might_fault+0x5c/0x7f
[    9.610939]        filldir+0xb3/0x125
[    9.610947]        call_filldir+0xb9/0xde
[    9.610952]        ext4_readdir+0x1ff/0x676
[    9.610958]        iterate_dir+0x93/0x13d
[    9.610964]        SyS_getdents+0xa4/0x117
[    9.610971]        entry_SYSCALL_64_fastpath+0x18/0xad
[    9.610973] 
               -> #3 (&type->i_mutex_dir_key#2){++++++}:
[    9.610986]        lock_acquire+0x46/0x60
[    9.610992]        down_read+0x39/0x5d
[    9.610997]        lookup_slow+0x7c/0x17f
[    9.611002]        walk_component+0xcd/0x214
[    9.611007]        link_path_walk+0xfa/0x44a
[    9.611013]        path_openat+0x213/0x6f9
[    9.611018]        do_filp_open+0x48/0x9e
[    9.611024]        file_open_name+0xe7/0xe9
[    9.611028]        filp_open+0x2d/0x44
[    9.611032]        kernel_read_file_from_path+0x33/0x6c
[    9.611039]        _request_firmware+0x39d/0x629
[    9.611044]        request_firmware_work_func+0x23/0x55
[    9.611049]        process_one_work+0x1c3/0x323
[    9.611055]        worker_thread+0x1ee/0x2c0
[    9.611060]        kthread+0x127/0x12f
[    9.611064]        ret_from_fork+0x2e/0x40
[    9.611066] 
               -> #2 (umhelper_sem){++++.+}:
[    9.611077]        lock_acquire+0x46/0x60
[    9.611083]        down_read+0x39/0x5d
[    9.611088]        usermodehelper_read_trylock+0x51/0x100
[    9.611092]        _request_firmware+0x2dc/0x629
[    9.611097]        request_firmware_direct+0x36/0x48
[    9.611103]        request_microcode_fw+0x54/0x88
[    9.611107]        reload_store+0xaa/0x114
[    9.611114]        dev_attr_store+0x14/0x1e
[    9.611121]        sysfs_kf_write+0x44/0x4b
[    9.611127]        kernfs_fop_write+0x117/0x161
[    9.611132]        __vfs_write+0x21/0xe7
[    9.611137]        vfs_write+0xdc/0x165
[    9.611142]        SyS_write+0x4c/0x89
[    9.611149]        entry_SYSCALL_64_fastpath+0x18/0xad
[    9.611151] 
               -> #1 (microcode_mutex){+.+.+.}:
[    9.611162]        lock_acquire+0x46/0x60
[    9.611167]        __mutex_lock+0x90/0x7b5
[    9.611173]        mutex_lock_nested+0x16/0x18
[    9.611181]        microcode_init+0xb8/0x1d7
[    9.611187]        do_one_initcall+0x8b/0x121
[    9.611192]        kernel_init_freeable+0x139/0x1c2
[    9.611197]        kernel_init+0x9/0xe6
[    9.611201]        ret_from_fork+0x2e/0x40
[    9.611203] 
               -> #0 (cpu_hotplug_lock.rw_sem){++++++}:
[    9.611214]        __lock_acquire+0xec4/0x1444
[    9.611219]        lock_acquire+0x46/0x60
[    9.611226]        get_online_cpus+0x38/0x98
[    9.611231]        apply_wqattrs_lock+0x9/0x19
[    9.611237]        apply_workqueue_attrs+0x15/0x2f
[    9.611244]        __alloc_workqueue_key+0x2b2/0x457
[    9.611250]        i915_gem_userptr_init__mmu_notifier+0xfb/0x213
[    9.611255]        i915_gem_userptr_ioctl+0x1cd/0x2b6
[    9.611260]        drm_ioctl+0x258/0x373
[    9.611266]        vfs_ioctl+0x13/0x2f
[    9.611272]        do_vfs_ioctl+0x5eb/0x5fe
[    9.611278]        SyS_ioctl+0x3e/0x5c
[    9.611284]        entry_SYSCALL_64_fastpath+0x18/0xad
[    9.611287] 
               other info that might help us debug this:

[    9.611290] Chain exists of:
                 cpu_hotplug_lock.rw_sem --> &mm->mmap_sem --> &dev_priv->mm_lock

[    9.611301]  Possible unsafe locking scenario:

[    9.611304]        CPU0                    CPU1
[    9.611306]        ----                    ----
[    9.611308]   lock(&dev_priv->mm_lock);
[    9.611314]                                lock(&mm->mmap_sem);
[    9.611319]                                lock(&dev_priv->mm_lock);
[    9.611324]   lock(cpu_hotplug_lock.rw_sem);
[    9.611329] 
                *** DEADLOCK ***

[    9.611333] 2 locks held by Xorg/341:
[    9.611336]  #0:  (&mm->mmap_sem){++++++}, at: [<ffffffff81312e62>] i915_gem_userptr_init__mmu_notifier+0x72/0x213
[    9.611348]  #1:  (&dev_priv->mm_lock){+.+.+.}, at: [<ffffffff81312e75>] i915_gem_userptr_init__mmu_notifier+0x85/0x213
[    9.611359] 
               stack backtrace:
[    9.611365] CPU: 1 PID: 341 Comm: Xorg Not tainted 4.12.0-rc2-next-20170523-dbg-dirty #231
[    9.611369] Call Trace:
[    9.611377]  dump_stack+0x70/0x9a
[    9.611384]  print_circular_bug+0x272/0x280
[    9.611389]  __lock_acquire+0xec4/0x1444
[    9.611396]  ? __lock_is_held+0x47/0x7a
[    9.611402]  lock_acquire+0x46/0x60
[    9.611408]  ? lock_acquire+0x46/0x60
[    9.611413]  ? apply_wqattrs_lock+0x9/0x19
[    9.611420]  get_online_cpus+0x38/0x98
[    9.611425]  ? apply_wqattrs_lock+0x9/0x19
[    9.611430]  apply_wqattrs_lock+0x9/0x19
[    9.611436]  apply_workqueue_attrs+0x15/0x2f
[    9.611443]  __alloc_workqueue_key+0x2b2/0x457
[    9.611449]  ? lockdep_init_map+0xb4/0x1a2
[    9.611456]  i915_gem_userptr_init__mmu_notifier+0xfb/0x213
[    9.611462]  i915_gem_userptr_ioctl+0x1cd/0x2b6
[    9.611467]  drm_ioctl+0x258/0x373
[    9.611473]  ? i915_gem_userptr_dmabuf_export+0x1a/0x1a
[    9.611480]  ? _raw_spin_unlock+0x2c/0x3f
[    9.611486]  ? find_held_lock+0x31/0x77
[    9.611493]  ? __fget+0x157/0x186
[    9.611500]  vfs_ioctl+0x13/0x2f
[    9.611506]  do_vfs_ioctl+0x5eb/0x5fe
[    9.611512]  ? __fget+0x174/0x186
[    9.611519]  SyS_ioctl+0x3e/0x5c
[    9.611527]  entry_SYSCALL_64_fastpath+0x18/0xad
[    9.611531] RIP: 0033:0x7f3398207cb7
[    9.611535] RSP: 002b:00007fff8f086f88 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[    9.611542] RAX: ffffffffffffffda RBX: 00007f339a2f6460 RCX: 00007f3398207cb7
[    9.611545] RDX: 00007fff8f087030 RSI: 00000000c0186473 RDI: 000000000000000b
[    9.611549] RBP: 00007fff8f087030 R08: 0000000001672010 R09: 000000000000007c
[    9.611552] R10: 000000000000009f R11: 0000000000000246 R12: 0000000001671000
[    9.611556] R13: 000000000000000b R14: 00007f339a2f6460 R15: 00007f339a2f6000

	-ss
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