M-core disables I210_SIUL1 via NVIC, which causes an A-core kernel panic.
When A-core debugs via the kernel command line using loglevel=7 debug, the kernel panic information is as follows:
[ 1977.361599] rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-... } 386566 jiffies s: 149 root: 0x1/.
[ 1977.361638] rcu: blocking rcu_node structures (internal RCU debug):
[ 1977.361643] Task dump for CPU 0:
[ 1977.361646] task:swapper/0 state:R running task stack: 0 pid: 0 ppid: 0 flags:0x0000000a
[ 1977.361658] Call trace:
[ 1977.361660] __switch_to+0xf8/0x14c
[ 1977.361679] 0x0
[ 1995.810781] systemd-journald[129]: Sent WATCHDOG=1 notification.
[ 1998.853570] rcu: INFO: rcu_preempt self-detected stall on CPU
[ 1998.853587] rcu: 0-....: (1 GPs behind) idle=54d/0/0x7 softirq=21933/21934 fqs=183681
[ 1998.853600] (t=462087 jiffies g=32685 q=77186)
[ 1998.853605] Task dump for CPU 0:
[ 1998.853609] task:swapper/0 state:R running task stack: 0 pid: 0 ppid: 0 flags:0x0000000a
[ 1998.853624] Call trace:
[ 1998.853626] dump_backtrace+0x0/0x1c0
[ 1998.853642] show_stack+0x18/0x40
[ 1998.853649] sched_show_task+0x168/0x19c
[ 1998.853658] dump_cpu_task+0x44/0x58
[ 1998.853666] rcu_dump_cpu_stacks+0xe8/0x12c
[ 1998.853673] rcu_sched_clock_irq+0x858/0xda0
[ 1998.853682] update_process_times+0x9c/0xf0
[ 1998.853689] tick_sched_timer+0x58/0xd0
[ 1998.853698] __hrtimer_run_queues+0x138/0x1d0
[ 1998.853706] hrtimer_interrupt+0xe8/0x244
[ 1998.853714] arch_timer_handler_virt+0x34/0x4c
[ 1998.853724] handle_percpu_devid_irq+0x84/0x130
[ 1998.853735] handle_domain_irq+0x60/0x90
[ 1998.853745] gic_handle_irq+0x54/0x130
[ 1998.853752] do_interrupt_handler+0x34/0x60
[ 1998.853760] el1_interrupt+0x30/0x80
[ 1998.853768] el1h_64_irq_handler+0x18/0x2c
[ 1998.853775] el1h_64_irq+0x78/0x7c
[ 1998.853782] _stext+0x9c/0x274
[ 1998.853788] irq_exit+0x88/0xc4
[ 1998.853795] handle_domain_irq+0x64/0x90
[ 1998.853803] gic_handle_irq+0x54/0x130
[ 1998.853808] call_on_irq_stack+0x20/0x4c
[ 1998.853814] do_interrupt_handler+0x54/0x60
[ 1998.853821] el1_interrupt+0x30/0x80
[ 1998.853827] el1h_64_irq_handler+0x18/0x2c
[ 1998.853834] el1h_64_irq+0x78/0x7c
[ 1998.853841] arch_cpu_idle+0x18/0x2c
[ 1998.853849] do_idle+0xc4/0x150
[ 1998.853856] cpu_startup_entry+0x24/0x60
[ 1998.853862] rest_init+0xe0/0xf0
[ 1998.853867] arch_call_rest_init+0x10/0x1c
[ 1998.853875] start_kernel+0x624/0x668
[ 1998.853882] __primary_switched+0xa0/0xa8
When loglevel=7 debug is not used, the kernel panic information is as follows:
[ 4008.606383] Unable to handle kernel paging request at virtual address 00000000003faa00
[ 4010.826820] Mem abort info:
[ 4010.829560] ESR = 0x0000000086000005
[ 4010.833288] EC = 0x21: IABT (current EL), IL = 32 bits
[ 4010.838589] SET = 0, FnV = 0
[ 4010.841614] EA = 0, S1PTW = 0
[ 4010.844737] FSC = 0x05: level 1 translation fault
[ 4010.849599] user pgtable: 4k pages, 39-bit VAs, pgdp=000000088dbb8000
[ 4010.856026] [00000000003faa00] pgd=0000000000000000, p4d=0000000000000000, pud=0000000000000000
[ 4010.864711] Internal error: Oops: 0000000086000005 [#1] PREEMPT SMP
[ 4010.864720] printk: console [ttyLF0]: printing thread stopped
[ 4010.870948] Modules linked in: ipc_shm_uio(O) uio_hse pfeng(O) gpio_pca953x sja1110(O) mse102x
[ 4010.885270] CPU: 0 PID: 12 Comm: ksoftirqd/0 Tainted: G O 5.15.145-rt73+g3a3fafb13baa+p0 #1
[ 4010.894902] Hardware name: Foxtron Fusion Domain Controller Gen 2 (XC1) (DT)
[ 4010.901933] pstate: 80000005 (Nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[ 4010.908874] pc : 0x3faa00
[ 4010.911479] lr : vchan_complete+0xc0/0x234
[ 4010.915558] sp : ffffffc00901bc80
[ 4010.918856] x29: ffffffc00901bcc0 x28: 0000000000000020 x27: 0000000000000000
[ 4010.925973] x26: ffffff88000a6180 x25: ffffffc008bafa00 x24: ffffff885f85d680
[ 4010.933091] x23: 0000000000000002 x22: ffffffc00901bc90 x21: ffffff88008206f8
[ 4010.940209] x20: ffffff880d9b0858 x19: ffffff8800820658 x18: 0000000000000001
[ 4010.947327] x17: 0000000000000000 x16: 0000000000000000 x15: ffffffc00901b710
[ 4010.954444] x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000000
[ 4010.961561] x11: 0000000000000003 x10: 00000000000003c1 x9 : 0000000000000c00
[ 4010.968679] x8 : 000000000003d2e8 x7 : ffffffc008ca5188 x6 : ffffffc008ca5170
[ 4010.975797] x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffffff88008206f8
[ 4010.982914] x2 : 00000000003faa00 x1 : ffffff880d9b0858 x0 : 0000000000000000
[ 4010.990033] Call trace:
[ 4010.992465] 0x3faa00
[ 4010.994721] tasklet_action_common.constprop.0+0x124/0x150
[ 4011.000189] tasklet_action+0x28/0x34
[ 4011.003833] _stext+0x11c/0x274
[ 4011.006958] run_ksoftirqd+0x4c/0x60
[ 4011.010517] smpboot_thread_fn+0x234/0x260
[ 4011.014596] kthread+0x174/0x180
[ 4011.017808] ret_from_fork+0x10/0x20
[ 4011.021378] Code: bad PC value
[ 4011.024410] ---[ end trace ab738991db2e3cd8 ]---
[ 4011.029098] Kernel panic - not syncing:
[ 4011.032824] Oops: Fatal exception in interrupt
[ 4011.032876] SMP: stopping secondary CPUs
[ 4011.041162] Kernel Offset: disabled
[ 4011.044630] CPU features: 0x8,00002001,20000842
[ 4011.049144] Memory Limit: none
[ 4011.052183] ---[ end Kernel panic - not syncing: Oops: Fatal exception in interrupt ]---
