On Wed, Apr 2, 2014 at 8:23 AM, Vikas Patil <vikasmpatil@xxxxxxxxx> wrote: > 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). > ok, to be fair this is more about pvr and some downstream patches to omapdrm to make it work with pvr, than the upstream omapdrm. tbh, I don't completely remember how this used to work.. it doesn't seem like the sort of thing that could be easily missed. You might want to compare to older omapdrm+pvr, I might have moved some of the locking around? Probably the best/safest thing would be to move the waiter->notify() callback off to omapdrm's workqueue, so it isn't called with spinlocks held. BR, -R > > [ 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 _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
