Why did probability appear in the startup process of 11nas router "INFO: rcu_sched self-detected stall on CPU"?The system will then print the exception information continuously.The following is a log:
[ 2.628942] 4 fixed-partitions partitions found on MTD device spi0.0
[ 2.641645] Creating 4 MTD partitions on "spi0.0":
[ 2.651298] 0x000000000000-0x000000030000 : "u-boot"
[ 2.663981] 0x000000030000-0x000000040000 : "u-boot-env"
[ 2.676652] 0x000000040000-0x000000050000 : "factory"
[ 2.688763] 0x000000050000-0x000001000000 : "firmware"
[ 2.704021] random: fast init done
[ 2.797203] 2 uimage-fw partitions found on MTD device firmware
[ 2.809074] 0x000000050000-0x000000241f42 : "kernel"
[ 2.821116] 0x000000241f42-0x000001000000 : "rootfs"
[ 2.833112] mtd: device 5 (rootfs) set to be root filesystem
[ 2.844611] 1 squashfs-split partitions found on MTD device rootfs
[ 2.856992] 0x000000450000-0x000001000000 : "rootfs_data"
[ 2.871579] libphy: Fixed MDIO Bus: probed
[ 4.921693] random: crng init done
[ 62.882643] INFO: rcu_sched self-detected stall on CPU
[ 62.892884] 0-...: (5999 ticks this GP) idle=2ba/140000000000002/0 softirq=84/84 fqs=2825
[ 62.909489] (t=6000 jiffies g=-279 c=-280 q=74)
[ 62.918861] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.14.54 #0
[ 62.930804] Stack : 00000000 00000000 00000000 00000000 80b7be92 00000034 00000000 00000000
[ 62.947476] 8fc3845c 8061df87 8059a9f0 00000000 00000001 00000001 8fc0dbc8 532616d7
[ 62.964147] 00000000 00000000 80b80000 8fc0dac4 86edf5c4 0000007f 00000007 00000000
[ 62.980818] 00000000 80620000 000e054d 00000000 00000000 00000000 80650000 80481974
[ 62.997489] 80625f20 8061b774 000001e0 80620000 00000003 8029cc70 00000000 80690000
[ 63.014162] ...
[ 63.019032] Call Trace:
[ 63.023915] [<80010598>] show_stack+0x58/0x100
[ 63.032765] [<8045b46c>] dump_stack+0x9c/0xe0
[ 63.041427] [<8000da20>] arch_trigger_cpumask_backtrace+0x50/0x78
[ 63.053573] [<800985a8>] rcu_dump_cpu_stacks+0xc4/0x13c
[ 63.063966] [<80097760>] rcu_check_callbacks+0x310/0x814
[ 63.074540] [<8009b244>] update_process_times+0x34/0x70
[ 63.084944] [<800acecc>] tick_handle_periodic+0x34/0xd0
[ 63.095358] [<8031d200>] gic_compare_interrupt+0x70/0x80
[ 63.105945] [<8008ad44>] handle_percpu_devid_irq+0xbc/0x1a8
[ 63.117028] [<800851e0>] generic_handle_irq+0x40/0x58
[ 63.127093] [<802595fc>] gic_handle_local_int+0x9c/0xe8
[ 63.137487] [<802597bc>] gic_irq_dispatch+0x10/0x20
[ 63.147188] [<800851e0>] generic_handle_irq+0x40/0x58
[ 63.157251] [<80479e7c>] do_IRQ+0x1c/0x2c
[ 63.165225] [<8025878c>] plat_irq_dispatch+0xfc/0x138
[ 63.175273] [<8000b5e8>] except_vec_vi_end+0xb8/0xc4
[ 63.185154] ------------[ cut here ]------------
[ 63.194350] WARNING: CPU: 0 PID: 1 at kernel/smp.c:416 smp_call_function_many+0xc8/0x34c
[ 63.210439] Modules linked in:
[ 63.216518] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.14.54 #0
[ 63.228458] Stack : 00000000 00000000 00000000 00000000 80b7be92 00000034 00000000 00000000
[ 63.245128] 8fc3845c 8061df87 8059a9f0 00000000 00000001 00000001 8fc0db38 532616d7
[ 63.261799] 00000000 00000000 80b80000 8fc0da34 86edf5c4 0000009a 00000007 00000000
[ 63.278470] 00000000 80620000 00034dc6 00000000 00000000 00000000 80650000 800b4b04
[ 63.295142] 00000009 000001a0 8000d1dc 00000000 00000003 8029cc70 00000000 80690000
[ 63.311813] ...
[ 63.316683] Call Trace:
[ 63.321545] [<80010598>] show_stack+0x58/0x100
[ 63.330384] [<8045b46c>] dump_stack+0x9c/0xe0
[ 63.339053] [<80030684>] __warn+0xe0/0x114
[ 63.347200] [<80030748>] warn_slowpath_null+0x1c/0x34
[ 63.357249] [<800b4b04>] smp_call_function_many+0xc8/0x34c
[ 63.368159] [<8000da38>] arch_trigger_cpumask_backtrace+0x68/0x78
[ 63.380284] [<800985a8>] rcu_dump_cpu_stacks+0xc4/0x13c
[ 63.390678] [<80097760>] rcu_check_callbacks+0x310/0x814
[ 63.401245] [<8009b244>] update_process_times+0x34/0x70
[ 63.411638] [<800acecc>] tick_handle_periodic+0x34/0xd0
[ 63.422034] [<8031d200>] gic_compare_interrupt+0x70/0x80
[ 63.432605] [<8008ad44>] handle_percpu_devid_irq+0xbc/0x1a8
[ 63.443689] [<800851e0>] generic_handle_irq+0x40/0x58
[ 63.453741] [<802595fc>] gic_handle_local_int+0x9c/0xe8
[ 63.464134] [<802597bc>] gic_irq_dispatch+0x10/0x20
[ 63.473835] [<800851e0>] generic_handle_irq+0x40/0x58
[ 63.483886] [<80479e7c>] do_IRQ+0x1c/0x2c
[ 63.491857] [<8025878c>] plat_irq_dispatch+0xfc/0x138
[ 63.501903] [<8000b5e8>] except_vec_vi_end+0xb8/0xc4
[ 63.511792] ---[ end trace 9d1d2d2a499501a4 ]---
version: 18.06 and 18.06.1
soc: 7621 soc
Hardware platform: 11nas router
The probability of: Four times out of ten
Repeat method: Constantly unplug and plug
Other exceptions: pppoe sometimes breaks flow