代码拉取完成，页面将自动刷新
复现步骤：
挂载后：
mkdir p1
cd p1
echo f > cpus
[ 136.505555] kernel BUG at arch/arm64/kernel/traps.c:417!
[ 136.509615] kernel BUG at arch/arm64/kernel/traps.c:417!
[ 136.514377] CPU: 3 PID: 0 Comm: swapper/3 Not tainted 4.19.95+ #13
[ 136.548883] Hardware name: Huawei TaiShan 2280 V2/BC82AMDD, BIOS 1.08 12/14/2019
[ 136.556528] pstate: 00400089 (nzcv daIf +PAN -UAO)
[ 136.561471] pc : do_undefinstr+0x64/0x68
[ 136.565508] lr : do_undefinstr+0x38/0x68
[ 136.569548] sp : ffff00000806fd80
[ 136.578994] x29: ffff00000806fd80 x28: ffff803fc46f6400
[ 136.590408] x27: 0000000000000000 x26: 0000000000000001
[ 136.601743] x25: 0000000000000003 x24: 0000000000000018
[ 136.613024] x23: 0000000020400089 x22: ffff0000080a53a8
[ 136.624121] x21: ffff00000806fee0 x20: 0000ffffffffffff
[ 136.635071] x19: ffff00000806fda0 x18: 0000000000000000
[ 136.646071] x17: 0000000000000000 x16: 0000000000000000
[ 136.656788] x15: 0000000000000000 x14: 0000000000000000
[ 136.667355] x13: 0000000000000000 x12: ffff805fffffe0c0
[ 136.677761] x11: 0000000000000040 x10: 0000000000000b80
[ 136.687954] x9 : ffff00000aeafe90 x8 : ffff803fc46f6fe0
[ 136.697990] x7 : 0000000000000000 x6 : ffff00000806fd78
[ 136.707844] x5 : 0000000000000000 x4 : ffff0000092434b0
[ 136.717473] x3 : 000000000000001f x2 : 651ade7c9516f600
[ 136.726900] x1 : 0000000000000000 x0 : 0000000020400089
[ 136.736139] Call trace:
[ 136.742498] do_undefinstr+0x64/0x68
[ 136.750011] el1_undef+0x10/0x84
[ 136.757109] __mpam_sched_in+0x58/0xc8
[ 136.764611] update_cpu_closid_rmid+0x50/0x60
[ 136.772654] flush_smp_call_function_queue+0x84/0x178
[ 136.781499] generic_smp_call_function_single_interrupt+0x18/0x20
[ 136.791530] handle_IPI+0x410/0x598
[ 136.798845] gic_handle_irq+0x144/0x164
[ 136.806386] el1_irq+0xb8/0x140
[ 136.813160] arch_cpu_idle+0x3c/0x1c0
[ 136.820297] default_idle_call+0x20/0x38
[ 136.827664] cpuidle_idle_call+0x14c/0x190
[ 136.835254] do_idle+0xac/0xf0
[ 136.841775] cpu_startup_entry+0x2c/0x30
[ 136.849212] secondary_start_kernel+0x134/0x160
[ 136.857276] Code: 94003965 f9400bf3 a8c27bfd d65f03c0 (d4210000)
[ 136.867175] ---[ end trace 6ca0447735f94559 ]---
[ 136.875614] Kernel panic - not syncing: Fatal exception in interrupt
[ 136.885958] SMP: stopping secondary CPUs
[ 137.965290] SMP: failed to stop secondary CPUs 0-3
[ 137.974228] Kernel Offset: disabled
[ 137.981923] CPU features: 0x12,a2200a38
[ 137.990004] Memory Limit: none
[ 137.997329] ---[ end Kernel panic - not syncing: Fatal exception in interrupt ]---
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do_undefinstr，应该是编译器问题吧，使用openEuler的7.3编译器没有这个问题
@hanjun-guo
gcc版本是9.2, mpam不支持gcc9.2吗？？
@haoxing990
邮件回复了，这里再贴上回复供其他同学参考
vmcore信息如下：
PID: 0 TASK: ffff8027dcd14ec0 CPU: 1 COMMAND: "swapper/1"
#0 [ffff00000800bc40] crash_kexec at ffff00000819df84
#1 [ffff00000800bc70] die at ffff00000808eb6c
#2 [ffff00000800bcb0] arm64_notify_die at ffff00000808eda8
#3 [ffff00000800bcc0] force_signal_inject at ffff00000808eff8
#4 [ffff00000800bd90] efi_header_end at ffff000008081044
#5 [ffff00000800bee0] el1_undef at ffff000008083214
PC: ffff0000080a1c88 [__mpam_sched_in+104]
LR: ffff0000080a1d48 [update_cpu_closid_rmid+88]
SP: ffff00000800bef0 PSTATE: 80400089
X29: ffff00000800bef0 X28: ffff0000097a3dc0 X27: ffff8027dcd14ec0
X26: 0000000000000001 X25: 0000000000000001 X24: 0000000000000001
X23: 0000000000000000 X22: 0000000000000001 X21: 0000000000000000
X20: 0000000000000000 X19: ffff00002fa1b9e0 X18: 0000000000000000
X17: 0000000000000000 X16: 0000000000000000 X15: 0000000000000000
X14: 0000000000000000 X13: 0000000000000000 X12: 0000000000000001
X11: ffff000008b689f0 X10: 0000000000000bc0 X9: ffff0000080a1d48
X8: ffff8027dcd15ae0 X7: 0000000000000018 X6: 0000000000000000
X5: 0000000000000000 X4: 00008027d6c1d000 X3: ffff8027df9c27a8
X2: 0000000000000001 X1: 0000000000000000 X0: ffff000008da57a8
#6 [ffff00000800bef0] __mpam_sched_in at ffff0000080a1c84
#7 [ffff00000800bf00] flush_smp_call_function_queue at ffff000008191e14
#8 [ffff00000800bf30] generic_smp_call_function_single_interrupt at ffff0000081 -- MORE -- forward:
crash> dis -l __mpam_sched_in+104
/mnt/new/kernel-4.19/arch/arm64/kernel/mpam.c: 1328
0xffff0000080a1c88 <__mpam_sched_in+104>: mrs x0, s3_0_c10_c5_1
MPAM是openEuler的preview功能，并不是非常完善；此功能需要BIOS支持，完成相关寄存器配置，如果BIOS不支持，会出现MPAM寄存器（如上面的s3_0_c10_c5_1）访问EL1无权限而导致的指令异常。
后面我们会提供从BIOS ACPI表获取信息来初始化MPAM，如果BIOS未提供ACPI表，就不初始化MPAM（不能使用），从而避免这类的问题
上面贴的内容gitee会中匹配bug标题，有点乱，关键信息如下：
crash> dis -l __mpam_sched_in+104
/mnt/new/kernel-4.19/arch/arm64/kernel/mpam.c: 1328
0xffff0000080a1c88 <__mpam_sched_in+104>: mrs x0, s3_0_c10_c5_1
MPAM是openEuler的preview功能，并不是非常完善；此功能需要BIOS支持，完成相关寄存器配置，如果BIOS不支持，会出现MPAM寄存器（如上面的s3_0_c10_c5_1）访问EL1无权限而导致的指令异常。
后面我们会提供从BIOS ACPI表获取信息来初始化MPAM，如果BIOS未提供ACPI表，就不初始化MPAM（不能使用），从而避免这类的问题
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