Forced restart by kernel BUG [DRIVE PX2]

I continued to run DRIVE PX2 with high load in 1 day, and it was forcibly restarted.
Looking at syslog’s kern.log, it is “Kernel BUG at ffffff8008c8fba0” and I want to understand this cause.

Does the DRIVE PX 2 have a bug that forcibly restarts when a high load continues?

CPU load:70%
CPU temperature:45〜55℃

Kernel ver:Linux nvidia 4.9.38-rt25-tegra
os:ubuntu 16.04.5

Please advise.
Thanks in advance

Dec 29 13:07:17 nvidia kernel: [125604.212585] ------------[ cut here ]------------
Dec 29 13:07:17 nvidia kernel: [125604.212588] Kernel BUG at ffffff8008c8fba0 [verbose debug info unavailable]
Dec 29 13:07:17 nvidia kernel: [125604.212591] Internal error: Oops - BUG: 0 [#1] PREEMPT SMP
Dec 29 13:07:17 nvidia kernel: [125604.212618] Modules linked in: snd_soc_tegra_alt_t186ref_p2382 snd_soc_tegra_asoc_machine_alt_t18x snd_soc_tegra_alt_machine snd_soc_tegra186_alt_dspk snd_soc_tegra210_alt_afc snd_soc_tegra186_alt_asrc snd_soc_tegra186_alt_arad snd_soc_tegra_virt_t210ref_pcm snd_soc_tegra210_virt_alt_admaif snd_soc_tegra210_alt_adsp snd_soc_tegra_virt_alt_ivc snd_soc_tegra210_alt_ope snd_soc_tegra210_alt_mbdrc snd_soc_tegra210_alt_peq snd_soc_tegra210_alt_spdif snd_soc_tegra210_alt_mvc snd_soc_tegra210_alt_sfc snd_soc_tegra210_alt_mixer snd_soc_tegra210_alt_adx snd_soc_tegra210_alt_amx snd_soc_tegra210_alt_dmic snd_soc_tegra210_alt_fpga_clock snd_soc_tegra210_alt_i2s snd_soc_spdif_tx snd_soc_tegra210_alt_admaif snd_soc_tegra_alt_isomgr snd_soc_tegra_alt_pcm snd_pcm_dmaengine snd_soc_tegra186_alt_xbar snd_soc_tegra210_alt_xbar_utils
Dec 29 13:07:17 nvidia kernel: [125604.212631]  snd_soc_core snd_pcm snd_timer snd_compress snd soundcore snd_soc_tegra_alt_utils bluetooth mttcan can_dev tegra_safety inter_tegra_spi ixgbe atlantic eqos_ape saf775x_hwdep rndis_host atmel_mxt_ts
Dec 29 13:07:17 nvidia kernel: [125604.212635] CPU: 3 PID: 845 Comm: irq/49-2490000. Not tainted 4.9.38-rt25-tegra #1
Dec 29 13:07:17 nvidia kernel: [125604.212636] Hardware name: drive-px2-a (DT)
Dec 29 13:07:17 nvidia kernel: [125604.212637] task: ffffffc1c8ebe580 task.stack: ffffffc1c56a0000
Dec 29 13:07:17 nvidia kernel: [125604.212644] PC is at rt_spin_lock_slowlock+0x258/0x2d4
Dec 29 13:07:17 nvidia kernel: [125604.212646] LR is at rt_spin_lock_slowlock+0xd4/0x2d4
Dec 29 13:07:17 nvidia kernel: [125604.212647] pc : [<ffffff8008c8fba0>] lr : [<ffffff8008c8fa1c>] pstate: 600000c5
Dec 29 13:07:17 nvidia kernel: [125604.212648] sp : ffffffc1c56a3c00
Dec 29 13:07:17 nvidia kernel: [125604.212650] x29: ffffffc1c56a3c00 x28: 00000000fffffff7 
Dec 29 13:07:17 nvidia kernel: [125604.212652] x27: ffffff8009679000 x26: 0000000000000008 
Dec 29 13:07:17 nvidia kernel: [125604.212654] x25: 0000000000000000 x24: 0000000000000040 
Dec 29 13:07:17 nvidia kernel: [125604.212656] x23: ffffffc1c8ebedb8 x22: ffffffc1c8ebe580 
Dec 29 13:07:17 nvidia kernel: [125604.212657] x21: ffffffc1c56a3c68 x20: ffffffc1c56a0000 
Dec 29 13:07:17 nvidia kernel: [125604.212658] x19: ffffffc1dc877bc8 x18: 0000000000000000 
Dec 29 13:07:17 nvidia kernel: [125604.212660] x17: 0000007f85a84210 x16: ffffff800811bf74 
Dec 29 13:07:17 nvidia kernel: [125604.212661] x15: 0000007f87305cc0 x14: 0000000000000000 
Dec 29 13:07:17 nvidia kernel: [125604.212663] x13: 0000000000000002 x12: 0000007f6dc8f180 
Dec 29 13:07:17 nvidia kernel: [125604.212664] x11: 0000000000000010 x10: 0000000000000a50 
Dec 29 13:07:17 nvidia kernel: [125604.212665] x9 : 0000000000000002 x8 : 0000000000000461 
Dec 29 13:07:17 nvidia kernel: [125604.212667] x7 : 0000000000000000 x6 : 0000000000000462 
Dec 29 13:07:17 nvidia kernel: [125604.212668] x5 : 00000000afb50401 x4 : 0000000000000400 
Dec 29 13:07:17 nvidia kernel: [125604.212669] x3 : 0000000000000000 x2 : 0000000000000000 
Dec 29 13:07:17 nvidia kernel: [125604.212671] x1 : 00000000d92bd92b x0 : 00000000ffffffdd 
Dec 29 13:07:17 nvidia kernel: [125604.212672] 
Dec 29 13:07:17 nvidia kernel: [125604.212673] Process irq/49-2490000. (pid: 845, stack limit = 0xffffffc1c56a0028)
Dec 29 13:07:17 nvidia kernel: [125604.212674] Call trace:
Dec 29 13:07:17 nvidia kernel: [125604.212677] [<ffffff8008c8fba0>] rt_spin_lock_slowlock+0x258/0x2d4
Dec 29 13:07:17 nvidia kernel: [125604.212680] [<ffffff8008c9186c>] rt_spin_lock__no_mg+0x44/0x4c
Dec 29 13:07:17 nvidia kernel: [125604.212685] [<ffffff80080ad1c8>] do_current_softirqs+0x11c/0x3f0
Dec 29 13:07:17 nvidia kernel: [125604.212687] [<ffffff80080ad4fc>] __local_bh_enable+0x60/0x70
Dec 29 13:07:17 nvidia kernel: [125604.212690] [<ffffff8008106374>] irq_forced_thread_fn+0x48/0x74
Dec 29 13:07:17 nvidia kernel: [125604.212692] [<ffffff8008106658>] irq_thread+0x144/0x204
Dec 29 13:07:17 nvidia kernel: [125604.212695] [<ffffff80080c852c>] kthread+0xf0/0x104
Dec 29 13:07:17 nvidia kernel: [125604.212698] [<ffffff8008082880>] ret_from_fork+0x10/0x50
Dec 29 13:07:17 nvidia kernel: [125604.495333] ---[ end trace 0000000000000002 ]---
Dec 29 13:07:17 nvidia kernel: [125604.501844] note: irq/49-2490000.[845] exited with preempt_count 1
Dec 29 13:07:17 nvidia kernel: [125604.501869] Unable to handle kernel paging request at virtual address ffffffffffffffd8
Dec 29 13:07:17 nvidia kernel: [125604.501871] pgd = ffffffc177890000
Dec 29 13:07:17 nvidia kernel: [125604.501873] [ffffffffffffffd8] *pgd=00000001f97a1003
Dec 29 13:07:17 nvidia kernel: [125604.501875] , *pud=00000001f97a1003
Dec 29 13:07:17 nvidia kernel: [125604.501875] , *pmd=0000000000000000
Dec 29 13:07:17 nvidia kernel: [125604.501876] 
Dec 29 13:07:17 nvidia kernel: [125604.501878] Internal error: Oops: 96000005 [#2] PREEMPT SMP
Dec 29 13:07:17 nvidia kernel: [125604.501896] Modules linked in: snd_soc_tegra_alt_t186ref_p2382 snd_soc_tegra_asoc_machine_alt_t18x snd_soc_tegra_alt_machine snd_soc_tegra186_alt_dspk snd_soc_tegra210_alt_afc snd_soc_tegra186_alt_asrc snd_soc_tegra186_alt_arad snd_soc_tegra_virt_t210ref_pcm snd_soc_tegra210_virt_alt_admaif snd_soc_tegra210_alt_adsp snd_soc_tegra_virt_alt_ivc snd_soc_tegra210_alt_ope snd_soc_tegra210_alt_mbdrc snd_soc_tegra210_alt_peq snd_soc_tegra210_alt_spdif snd_soc_tegra210_alt_mvc snd_soc_tegra210_alt_sfc snd_soc_tegra210_alt_mixer snd_soc_tegra210_alt_adx snd_soc_tegra210_alt_amx snd_soc_tegra210_alt_dmic snd_soc_tegra210_alt_fpga_clock snd_soc_tegra210_alt_i2s snd_soc_spdif_tx snd_soc_tegra210_alt_admaif snd_soc_tegra_alt_isomgr snd_soc_tegra_alt_pcm snd_pcm_dmaengine snd_soc_tegra186_alt_xbar snd_soc_tegra210_alt_xbar_utils
Dec 29 13:07:17 nvidia kernel: [125604.501906]  snd_soc_core snd_pcm snd_timer snd_compress snd soundcore snd_soc_tegra_alt_utils bluetooth mttcan can_dev tegra_safety inter_tegra_spi ixgbe atlantic eqos_ape saf775x_hwdep rndis_host atmel_mxt_ts
Dec 29 13:07:17 nvidia kernel: [125604.501909] CPU: 3 PID: 845 Comm: irq/49-2490000. Tainted: G      D         4.9.38-rt25-tegra #1
Dec 29 13:07:17 nvidia kernel: [125604.501910] Hardware name: drive-px2-a (DT)
Dec 29 13:07:17 nvidia kernel: [125604.501912] task: ffffffc1c8ebe580 task.stack: ffffffc1c56a0000
Dec 29 13:07:17 nvidia kernel: [125604.501918] PC is at kthread_data+0x4/0xc
Dec 29 13:07:17 nvidia kernel: [125604.501921] LR is at irq_thread_dtor+0x24/0xa0
Dec 29 13:07:17 nvidia kernel: [125604.501922] pc : [<ffffff80080c9134>] lr : [<ffffff8008106498>] pstate: 600003c5
Dec 29 13:07:17 nvidia kernel: [125604.501923] sp : ffffffc1c56a3880
Dec 29 13:07:17 nvidia kernel: [125604.501925] x29: ffffffc1c56a3880 x28: ffffffc1c56a0000 
Dec 29 13:07:17 nvidia kernel: [125604.501927] x27: ffffff8009679000 x26: 0000000000000008 
Dec 29 13:07:17 nvidia kernel: [125604.501929] x25: ffffffc1c8ebe580 x24: 0000000000000000 
Dec 29 13:07:17 nvidia kernel: [125604.501930] x23: ffffff8009665000 x22: ffffff80098a3000 
Dec 29 13:07:17 nvidia kernel: [125604.501932] x21: ffffffc1c8ebe580 x20: ffffffc1c8ebed58 
Dec 29 13:07:17 nvidia kernel: [125604.501933] x19: ffffffc1c8ebe580 x18: 000000000000000b 
Dec 29 13:07:17 nvidia kernel: [125604.501935] x17: 0000000000000006 x16: 0000000000000003 
Dec 29 13:07:17 nvidia kernel: [125604.501936] x15: 0000000000000234 x14: bc725a202593c9e1 
Dec 29 13:07:17 nvidia kernel: [125604.501937] x13: 0000000000040926 x12: ffffffc1c56a3868 
Dec 29 13:07:17 nvidia kernel: [125604.501939] x11: ffffffffffffffff x10: ffffff80098a8348 
Dec 29 13:07:17 nvidia kernel: [125604.501940] x9 : 0000000000000001 x8 : ffffff80098af6f4 
Dec 29 13:07:17 nvidia kernel: [125604.501942] x7 : 0000000000000000 x6 : ffffffc1c8ebeda0 
Dec 29 13:07:17 nvidia kernel: [125604.501943] x5 : 0000000000000000 x4 : ffffffc1c8ebedb8 
Dec 29 13:07:17 nvidia kernel: [125604.501944] x3 : 0000000000000000 x2 : ffffff8008106474 
Dec 29 13:07:17 nvidia kernel: [125604.501946] x1 : ffffffc1c56a3e08 x0 : 0000000000000000 
Dec 29 13:07:17 nvidia kernel: [125604.501946] 
Dec 29 13:07:17 nvidia kernel: [125604.501948] Process irq/49-2490000. (pid: 845, stack limit = 0xffffffc1c56a0028)
Dec 29 13:07:17 nvidia kernel: [125604.501948] Call trace:
Dec 29 13:07:17 nvidia kernel: [125604.501951] [<ffffff80080c9134>] kthread_data+0x4/0xc
Dec 29 13:07:17 nvidia kernel: [125604.501954] [<ffffff80080c6730>] task_work_run+0xc0/0xdc
Dec 29 13:07:17 nvidia kernel: [125604.501957] [<ffffff80080abb70>] do_exit+0x2d0/0x9f4
Dec 29 13:07:17 nvidia kernel: [125604.501961] [<ffffff80080895d0>] bug_handler.part.4+0x0/0x7c
Dec 29 13:07:17 nvidia kernel: [125604.501963] [<ffffff8008089610>] bug_handler.part.4+0x40/0x7c
Dec 29 13:07:17 nvidia kernel: [125604.501965] [<ffffff8008089668>] bug_handler+0x1c/0x2c
Dec 29 13:07:17 nvidia kernel: [125604.501966] [<ffffff80080841ac>] brk_handler+0x90/0xd4
Dec 29 13:07:17 nvidia kernel: [125604.501968] [<ffffff8008080c4c>] do_debug_exception+0x4c/0xd0
Dec 29 13:07:17 nvidia kernel: [125604.501969] [<ffffff8008081ec0>] el1_dbg+0x18/0x74
Dec 29 13:07:17 nvidia kernel: [125604.501973] [<ffffff8008c9186c>] rt_spin_lock__no_mg+0x44/0x4c
Dec 29 13:07:17 nvidia kernel: [125604.501975] [<ffffff80080ad1c8>] do_current_softirqs+0x11c/0x3f0
Dec 29 13:07:17 nvidia kernel: [125604.501977] [<ffffff80080ad4fc>] __local_bh_enable+0x60/0x70
Dec 29 13:07:17 nvidia kernel: [125604.501979] [<ffffff8008106374>] irq_forced_thread_fn+0x48/0x74
Dec 29 13:07:17 nvidia kernel: [125604.501980] [<ffffff8008106658>] irq_thread+0x144/0x204
Dec 29 13:07:17 nvidia kernel: [125604.501982] [<ffffff80080c852c>] kthread+0xf0/0x104
Dec 29 13:07:17 nvidia kernel: [125604.501983] [<ffffff8008082880>] ret_from_fork+0x10/0x50
Dec 29 13:07:17 nvidia kernel: [125604.850773] ---[ end trace 0000000000000003 ]---
Dec 29 13:07:17 nvidia kernel: [125604.857369] Fixing recursive fault but reboot is needed!

Dear kawaharaat

The symptom is a an internal macro in the kernel which is invoked when kernel feels that it has encountered an un-recoverable situation.

May I know if you change anything, e.g., rebuild the kernel) or add kernel modules?