Hi,
While trying PRIME, I got a lockdep warning after exiting glxgears. Is it harmful? The command was:
DRI_PRIME=1 glxgears
Offload provider is a GT425M (NVC0), output sink is an Intel i5-460M.
Kind regards, Peter
dmesg: ============================================= [ INFO: possible recursive locking detected ] 3.15.0-rc8-custom-00058-gd2cfd31 #1 Tainted: G O --------------------------------------------- X/25827 is trying to acquire lock: (&dev->struct_mutex){+.+.+.}, at: [<ffffffffa008ebb6>] i915_gem_unmap_dma_buf+0x36/0xd0 [i915]
but task is already holding lock: (&dev->struct_mutex){+.+.+.}, at: [<ffffffffa00055c5>] drm_gem_object_handle_unreference_unlocked+0x105/0x130 [drm]
other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&dev->struct_mutex); lock(&dev->struct_mutex);
*** DEADLOCK *** May be due to missing lock nesting notation 1 lock held by X/25827: #0: (&dev->struct_mutex){+.+.+.}, at: [<ffffffffa00055c5>] drm_gem_object_handle_unreference_unlocked+0x105/0x130 [drm]
stack backtrace: CPU: 1 PID: 25827 Comm: X Tainted: G O 3.15.0-rc8-custom-00058-gd2cfd31 #1 Hardware name: CLEVO CO. B7130 /B7130 , BIOS 6.00 08/27/2010 ffffffff822588a0 ffff880230767ae0 ffffffff815f14da ffff880226594260 ffff880230767bb0 ffffffff810a1461 0000000030767bc0 ffff880226594288 ffff880230767b00 ffff880226594ae0 0000000000464232 0000000000000001 Call Trace: [<ffffffff815f14da>] dump_stack+0x4e/0x7a [<ffffffff810a1461>] __lock_acquire+0x19d1/0x1ab0 [<ffffffff810a1d75>] lock_acquire+0x95/0x130 [<ffffffffa008ebb6>] ? i915_gem_unmap_dma_buf+0x36/0xd0 [i915] [<ffffffffa008ebb6>] ? i915_gem_unmap_dma_buf+0x36/0xd0 [i915] [<ffffffff815f57f5>] mutex_lock_nested+0x65/0x400 [<ffffffffa008ebb6>] ? i915_gem_unmap_dma_buf+0x36/0xd0 [i915] [<ffffffffa008ebb6>] i915_gem_unmap_dma_buf+0x36/0xd0 [i915] [<ffffffff8141eb4c>] dma_buf_unmap_attachment+0x4c/0x70 [<ffffffffa001beb2>] drm_prime_gem_destroy+0x22/0x40 [drm] [<ffffffffa07aa4de>] nouveau_gem_object_del+0x3e/0x60 [nouveau] [<ffffffffa000504a>] drm_gem_object_free+0x2a/0x40 [drm] [<ffffffffa00055e8>] drm_gem_object_handle_unreference_unlocked+0x128/0x130 [drm] [<ffffffffa00056aa>] drm_gem_handle_delete+0xba/0x110 [drm] [<ffffffffa0005dc5>] drm_gem_close_ioctl+0x25/0x30 [drm] [<ffffffffa0003a80>] drm_ioctl+0x1e0/0x5f0 [drm] [<ffffffffa0005da0>] ? drm_gem_handle_create+0x40/0x40 [drm] [<ffffffff815f8bbd>] ? _raw_spin_unlock_irqrestore+0x5d/0x80 [<ffffffff8109f6bd>] ? trace_hardirqs_on_caller+0x15d/0x200 [<ffffffff8109f76d>] ? trace_hardirqs_on+0xd/0x10 [<ffffffff815f8ba2>] ? _raw_spin_unlock_irqrestore+0x42/0x80 [<ffffffffa07a2175>] nouveau_drm_ioctl+0x65/0xa0 [nouveau] [<ffffffff811a7fb0>] do_vfs_ioctl+0x2f0/0x4f0 [<ffffffff811b320c>] ? __fget+0xac/0xf0 [<ffffffff811b3165>] ? __fget+0x5/0xf0 [<ffffffff811a8231>] SyS_ioctl+0x81/0xa0 [<ffffffff816015d2>] system_call_fastpath+0x16/0x1b