Crash report: https://crash-stats.mozilla.org/report/index/4397f601-c470-4b9b-9d24-20d8d0220828

Reason: SIGSYS / SYS_SECCOMP

Top 10 frames of crashing thread:

0 libc.so.6 statfs /usr/src/debug/glibc/sysdeps/unix/sysv/linux/statfs64.c:34
1 libnvidia-glcore.so.515.65.01 _nv011glcore 
2 libnvidia-glcore.so.515.65.01 _nv011glcore 
3 libnvidia-glcore.so.515.65.01 _nv011glcore 
4 libGLX_nvidia.so.0 <.text ELF section in libGLX_nvidia.so.515.65.01> 
5 libGLX_nvidia.so.0 vk_icdNegotiateLoaderICDInterfaceVersion 
6 libGLX_nvidia.so.0 <.init ELF section in libGLX_nvidia.so.515.65.01> 
7 ld-linux-x86-64.so.2 call_init /usr/src/debug/glibc/elf/dl-init.c:26
8 ld-linux-x86-64.so.2 _dl_init /usr/src/debug/glibc/elf/dl-init.c:117
9 libc.so.6 __GI__dl_catch_exception /usr/src/debug/glibc/elf/dl-error-skeleton.c:182

It looks like NVidia's proprietary drivers are at it again with some statfs calls.

"adapters": [
    {
        "description": "Mesa Intel(R) HD Graphics 630 (KBL GT2)",
        "vendorID": "0x8086",
        "deviceID": "0x5912",
        "subsysID": null,
        "RAM": 0,
        "driver": null,
        "driverVendor": "mesa/iris",
        "driverVersion": "22.1.7.0",
        "driverDate": null,
        "GPUActive": true
    },
    {
        "description": null,
        "vendorID": "0x10de",
        "deviceID": "0x1b06",
        "subsysID": null,
        "RAM": null,
        "driver": null,
        "driverVendor": null,
        "driverVersion": null,
        "driverDate": null,
        "GPUActive": false
    }
],

Looks like bug 1780312 with a slightly different crash signature; I'm going to assume that my attempt to avoid this statfs didn't actually work.