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Hello, experts:
Recently, I run a Qt5 demo on my pandaboard with opengl that uses hardware acceleration ,my system is ubuntu12.04(kernel is linux-ti-omap4 (3.4.0-1491.3) precise).  After about half a day the demo hung, then the kernel panic(I am a chinese student ,Please forgive my poor English level).

the kernel info is this:
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root@yy-desktop:/home/yy# [10920.823944] INFO: task irq/142-emif.1:137 blocked for more than 120 seconds.
[10920.831420] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[10920.848144] Kernel panic - not syncing: hung_task: blocked tasks
[10920.854522] [<c001be78>] (unwind_backtrace+0x0/0xec) from [<c0585454>] (dump_stack+0x20/0x24)
[10920.863586] [<c0585454>] (dump_stack+0x20/0x24) from [<c0585970>] (panic+0x98/0x1e8)
[10920.871795] [<c0585970>] (panic+0x98/0x1e8) from [<c00bb7b4>] (watchdog+0x1f8/0x25c)
[10920.880004] [<c00bb7b4>] (watchdog+0x1f8/0x25c) from [<c00661ac>] (kthread+0x9c/0xac)
[10920.888336] [<c00661ac>] (kthread+0x9c/0xac) from [<c0014884>] (kernel_thread_exit+0x0/0x8)
[10920.897186] CPU1: stopping
[10920.900085] [<c001be78>] (unwind_backtrace+0x0/0xec) from [<c0585454>] (dump_stack+0x20/0x24)
[10920.909118] [<c0585454>] (dump_stack+0x20/0x24) from [<c00196ac>] (handle_IPI+0x108/0x1e4)
[10920.917907] [<c00196ac>] (handle_IPI+0x108/0x1e4) from [<c00086e0>] (gic_handle_irq+0x68/0x70)
[10920.927032] [<c00086e0>] (gic_handle_irq+0x68/0x70) from [<c05904c0>] (__irq_svc+0x40/0x70)
[10920.935913] Exception stack(0xed063b48 to 0xed063b90)
[10920.941253] 3b40:                   c0ac44b4 00000001 ed063b60 00000000 c0ac44b4 ed00b000
[10920.949951] 3b60: ed00b000 00000001 00000000 00200010 00000000 ed063b9c ed063ba0 ed063b90
[10920.958618] 3b80: c01423a0 c058f898 200b0113 ffffffff
[10920.963989] [<c05904c0>] (__irq_svc+0x40/0x70) from [<c058f898>] (_raw_spin_unlock+0xc/0x50)
[10920.972930] [<c058f898>] (_raw_spin_unlock+0xc/0x50) from [<c01423a0>] (put_super+0x34/0x3c)
[10920.981903] [<c01423a0>] (put_super+0x34/0x3c) from [<c014248c>] (drop_super+0x28/0x2c)
[10920.990386] [<c014248c>] (drop_super+0x28/0x2c) from [<c01432cc>] (prune_super+0x158/0x16c)
[10920.999267] [<c01432cc>] (prune_super+0x158/0x16c) from [<c0108758>] (shrink_slab+0xa4/0x3a4)
[10921.008300] [<c0108758>] (shrink_slab+0xa4/0x3a4) from [<c010bcc4>] (do_try_to_free_pages+0x318/0x560)
[10921.018188] [<c010bcc4>] (do_try_to_free_pages+0x318/0x560) from [<c010c1cc>] (try_to_free_pages+0xe8/0x1b4)
[10921.028625] [<c010c1cc>] (try_to_free_pages+0xe8/0x1b4) from [<c00fc710>] (__perform_reclaim+0x84/0xb4)
[10921.038604] [<c00fc710>] (__perform_reclaim+0x84/0xb4) from [<c00ff61c>] (__alloc_pages_nodemask+0x428/0x758)
[10921.049133] [<c00ff61c>] (__alloc_pages_nodemask+0x428/0x758) from [<c004301c>] (copy_process.part.26+0xb0/0xfe0)
[10921.060028] [<c004301c>] (copy_process.part.26+0xb0/0xfe0) from [<c00440c8>] (do_fork+0x124/0x3ac)
[10921.069519] [<c00440c8>] (do_fork+0x124/0x3ac) from [<c00149c8>] (kernel_thread+0x78/0x88)
[10921.078308] [<c00149c8>] (kernel_thread+0x78/0x88) from [<c005dd00>] (__call_usermodehelper+0x4c/0x94)
[10921.088195] [<c005dd00>] (__call_usermodehelper+0x4c/0x94) from [<c0061918>] (process_one_work+0x254/0x454)
[10921.098510] [<c0061918>] (process_one_work+0x254/0x454) from [<c0061ea4>] (worker_thread+0x1ac/0x2d0)
[10921.108306] [<c0061ea4>] (worker_thread+0x1ac/0x2d0) from [<c00661ac>] (kthread+0x9c/0xac)
[10921.117095] [<c00661ac>] (kthread+0x9c/0xac) from [<c0014884>] (kernel_thread_exit+0x0/0x8)
[10921.125946] panic occurred, switching back to text console
----------------------------------------------------------------------------------------------------------------------------

then I reboot the pandaboard , after 3 hours, the kernel panic again,
The results of each kernel crash causes are not the same:

------------------------------------------------------------------------------------------------------------------------------

root@yy-desktop:/opt# [11042.000427] INFO: task kworker/0:2:2395 blocked for more than 120 seconds.
[11042.007751] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[11043.024078] Kernel panic - not syncing: hung_task: blocked tasks
[11043.030456] [<c001be78>] (unwind_backtrace+0x0/0xec) from [<c0585454>] (dump_stack+0x20/0x24)
[11043.039489] [<c0585454>] (dump_stack+0x20/0x24) from [<c0585970>] (panic+0x98/0x1e8)
[11043.047698] [<c0585970>] (panic+0x98/0x1e8) from [<c00bb7b4>] (watchdog+0x1f8/0x25c)
[11043.055938] [<c00bb7b4>] (watchdog+0x1f8/0x25c) from [<c00661ac>] (kthread+0x9c/0xac)
[11043.064239] [<c00661ac>] (kthread+0x9c/0xac) from [<c0014884>] (kernel_thread_exit+0x0/0x8)
[11043.073089] CPU0: stopping
[11043.075958] [<c001be78>] (unwind_backtrace+0x0/0xec) from [<c0585454>] (dump_stack+0x20/0x24)
[11043.085021] [<c0585454>] (dump_stack+0x20/0x24) from [<c00196ac>] (handle_IPI+0x108/0x1e4)
[11043.093780] [<c00196ac>] (handle_IPI+0x108/0x1e4) from [<c00086e0>] (gic_handle_irq+0x68/0x70)
[11043.102935] [<c00086e0>] (gic_handle_irq+0x68/0x70) from [<c05904c0>] (__irq_svc+0x40/0x70)
[11043.111785] Exception stack(0xeb3a3ad8 to 0xeb3a3b20)
[11043.117126] 3ac0:                                                       ed00a0a4 eb3a2000
[11043.125823] 3ae0: 00000000 ed00a000 eb3a3bb4 eb3a3c58 0000000a eb3a3bbc 0000000a 00200010
[11043.134490] 3b00: ed00a0a4 eb3a3bac eb3a3b10 eb3a3b20 c010761c c010a97c 40000113 ffffffff
[11043.143157] [<c05904c0>] (__irq_svc+0x40/0x70) from [<c010a97c>] (shrink_mem_cgroup_zone+0x74/0x524)
[11043.152862] [<c010a97c>] (shrink_mem_cgroup_zone+0x74/0x524) from [<c010ae9c>] (shrink_zone+0x70/0xa4)
[11043.162719] [<c010ae9c>] (shrink_zone+0x70/0xa4) from [<c010bbec>] (do_try_to_free_pages+0x240/0x560)
[11043.172515] [<c010bbec>] (do_try_to_free_pages+0x240/0x560) from [<c010c1cc>] (try_to_free_pages+0xe8/0x1b4)
[11043.182922] [<c010c1cc>] (try_to_free_pages+0xe8/0x1b4) from [<c00fc710>] (__perform_reclaim+0x84/0xb4)
[11043.192901] [<c00fc710>] (__perform_reclaim+0x84/0xb4) from [<c00ff61c>] (__alloc_pages_nodemask+0x428/0x758)
[11043.203430] [<c00ff61c>] (__alloc_pages_nodemask+0x428/0x758) from [<c0131b2c>] (new_slab+0x98/0x218)
[11043.213195] [<c0131b2c>] (new_slab+0x98/0x218) from [<c0587d50>] (__slab_alloc.isra.43.constprop.50+0x208/0x540)
[11043.223999] [<c0587d50>] (__slab_alloc.isra.43.constprop.50+0x208/0x540) from [<c0133f0c>] (kmem_cache_alloc_trace+0x6c/0x1cc)
[11043.236083] [<c0133f0c>] (kmem_cache_alloc_trace+0x6c/0x1cc) from [<c03556d0>] (drm_vm_open_locked+0x50/0x98)
[11043.246612] [<c03556d0>] (drm_vm_open_locked+0x50/0x98) from [<c0350a50>] (drm_gem_mmap+0x144/0x170)
[11043.256286] [<c0350a50>] (drm_gem_mmap+0x144/0x170) from [<c044a960>] (omap_gem_mmap+0x20/0x6c)
[11043.265533] [<c044a960>] (omap_gem_mmap+0x20/0x6c) from [<c0120f38>] (mmap_region+0x2b8/0x4f8)
[11043.274658] [<c0120f38>] (mmap_region+0x2b8/0x4f8) from [<c0121468>] (do_mmap_pgoff+0x2f0/0x348)
[11043.283996] [<c0121468>] (do_mmap_pgoff+0x2f0/0x348) from [<c0121580>] (sys_mmap_pgoff+0xc0/0x11c)
[11043.293487] [<c0121580>] (sys_mmap_pgoff+0xc0/0x11c) from [<c0013600>] (ret_fast_syscall+0x0/0x30)
[11043.303009] panic occurred, switching back to text console
---------------------------------------------------------------------------------------------------------------------------------------------------

My guess is that sgx540 driver causes a kernel crash, Ubuntu in terms of
3D acceleration seems to be a lot less,Can you give me some advice to
help me? Thank you very much!

** Affects: linux-ti-omap4 (Ubuntu)
     Importance: Undecided
         Status: New

-- 
kernel hung ,when I running a Qt5(based QML)demo with openGL ,ubuntu12.04 pandaboard
https://bugs.launchpad.net/bugs/1451682
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