spinlock lockup suspected on CPU error on omapdrm

[Vikas Patil]

Hi,
I am seeing following kernel backtrace on J6 with linux 3.8.13 when trying
to start IVI LM service. Before starting this I started the X11 and run
some GLES2/X11 based tests successfully.

The same binaries and my graphics driver are working fine on OMAP5 and
linux 3.4.25. Is this some known BUG in omapdrm driver? If not a bug then
how should I go for debugging it?

>From the trace what I understood is, this is case of nested spinlock and I
might be seeing this error due to this as in the trace omap_gem_op_update()
and omap_gem_set_sync_object(), both functions are trying to acquire
spin_lock(&sync_lock).


[  719.005340] BUG: spinlock lockup suspected on CPU#0, kworker/u:2/787
[  719.011749]  lock: sync_lock+0x0/0x20, .magic: dead4ead, .owner:
kworker/u:2/787, .owner_cpu: 0
[  719.020507] [<c001bbc0>] (unwind_backtrace+0x0/0x138) from [<c02896d0>]
(do_raw_spin_lock+0x100/0x17c)
[  719.029876] [<c02896d0>] (do_raw_spin_lock+0x100/0x17c) from
[<c03157ec>] (omap_gem_set_sync_object+0x14/0xf4)
[  719.039978] [<c03157ec>] (omap_gem_set_sync_object+0x14/0xf4) from
[<bf0091f4>] (FreeMemCallBackCommon+0xf4/0x24c [omapdrm_pvr])
[  719.051635] [<bf0091f4>] (FreeMemCallBackCommon+0xf4/0x24c
[omapdrm_pvr]) from [<bf0093d0>] (UnwrapExtMemoryCallBack+0x28/0x68
[omapdrm_pvr])
[  719.064544] [<bf0093d0>] (UnwrapExtMemoryCallBack+0x28/0x68
[omapdrm_pvr]) from [<bf013d3c>] (FreeResourceByPtr.part.0+0xac/0xcc
[omapdrm_pvr])
[  719.077575] [<bf013d3c>] (FreeResourceByPtr.part.0+0xac/0xcc
[omapdrm_pvr]) from [<bf0144d0>] (ResManFreeResByPtr+0x44/0x6c
[omapdrm_pvr])
[  719.090118] [<bf0144d0>] (ResManFreeResByPtr+0x44/0x6c [omapdrm_pvr])
from [<bf008980>] (async_unmap+0x28/0x44 [omapdrm_pvr])
[  719.101531] [<bf008980>] (async_unmap+0x28/0x44 [omapdrm_pvr]) from
[<c0315528>] (sync_op_update+0x88/0xa8)
[  719.111328] [<c0315528>] (sync_op_update+0x88/0xa8) from [<c03157c8>]
(omap_gem_op_update+0x14/0x24)
[  719.120544] [<c03157c8>] (omap_gem_op_update+0x14/0x24) from
[<bf010578>] (PVRSRVMISR+0xc/0x60 [omapdrm_pvr])
[  719.130523] [<bf010578>] (PVRSRVMISR+0xc/0x60 [omapdrm_pvr]) from
[<c005a810>] (process_one_work+0x1c8/0x5c0)
[  719.140502] [<c005a810>] (process_one_work+0x1c8/0x5c0) from
[<c005af58>] (worker_thread+0x168/0x444)
[  719.149810] [<c005af58>] (worker_thread+0x168/0x444) from [<c005fa40>]
(kthread+0xa4/0xb0)
[  719.158142] [<c005fa40>] (kthread+0xa4/0xb0) from [<c00140d0>]
(ret_from_fork+0x14/0x24)

Thanking you for your time.

Thanks & Regards,
Vikas
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