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Bug#979765: Kernel panic of linux 5.10.19-1 with VIA Nano L2200 on VX800

Cross-posted to 2 groups.

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As a workaround, I'm passing kernel parameter 'initcall_blacklist=init_hw_perf_events' to disable the Zhaoxin PMU driver. The system boots without panic. Differences in the boot log:

[    0.000000] Linux version 5.10.0-4-amd64 (debian-kernel@lists.debian.org) (gcc-10 (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2) #1 SMP Debian 5.10.19-1 (2021-03-02)
[    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-5.10.0-4-amd64 root=UUID=b67d3756-ab82-433c-bf15-babec8b88979 ro single initcall_blacklist=init_hw_perf_events console=tty0 console=ttyS0,115200
...
[    0.901032] Freeing SMP alternatives memory: 32K
[    1.018469] smpboot: CPU0: Centaur VIA Nano processor L2200@1600MHz (family: 0x6, model: 0xf, stepping: 0x2)
[    1.021040] rcu: Hierarchical SRCU implementation.
[    1.029009] NMI watchdog: Perf NMI watchdog permanently disabled
...


Without the parameter, the kernel logs the following (copied from the attached boot log in my previous message):

[    0.000000] Linux version 5.10.0-4-amd64 (debian-kernel@lists.debian.org) (gcc-10 (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2) #1 SMP Debian 5.10.19-1 (2021-03-02)
[    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-5.10.0-4-amd64 root=UUID=b67d3756-ab82-433c-bf15-babec8b88979 ro single console=tty0 console=ttyS0,115200
...
[    0.892088] Freeing SMP alternatives memory: 32K
[    1.009527] smpboot: CPU0: Centaur VIA Nano processor L2200@1600MHz (family: 0x6, model: 0xf, stepping: 0x2)
[    1.011855] Performance Events:
[    1.011858] core: Welcome to zhaoxin pmu!
[    1.019298] core: Version check pass!
[    1.023297] ZXC events, zhaoxin PMU driver.
[    1.027299] ... version:                2
[    1.031297] ... bit width:              40
[    1.035297] ... generic registers:      3
[    1.039297] ... value mask:             000000ffffffffff
[    1.043297] ... max period:             0000007fffffffff
[    1.047297] ... fixed-purpose events:   3
[    1.051297] ... event mask:             0000000700000007
[    1.055663] rcu: Hierarchical SRCU implementation.
[    1.063822] NMI watchdog: Enabled. Permanently consumes one hw-PMU counter.
...

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Bug#979765: Kernel panic of linux 5.10.19-1 with VIA Nano L2200 on VX800 8vvbbqzo567a@nospam.xutrox.com - 2021-03-15 11:10 +0100

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