page table check panic repro

repro.c

#define _GNU_SOURCE
#include <fcntl.h>
#include <sched.h>
#include <stdint.h>
#include <stdlib.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <unistd.h>
#include <sys/mman.h>
#include <linux/perf_event.h>
#include <stdio.h>

int main(void)
{
        char *addr = (char *)0x20000000ul;
        struct perf_event_attr *attr = (void *)addr + 1024 * 1024;
        char *file = "./bus";
        char *dir = "./dir";
        int fd1, fd2;
        void *rv_mmap;

        unshare(CLONE_NEWNS);
        mkdir(dir, 0777);
        mount(NULL, dir, "tmpfs", 0, "huge=always");
        chdir(dir);
        fd1 = creat(file, 0);
        ftruncate(fd1, 2 * 1024 * 1024);
        close(fd1);
        fd1 = open(file, 0);
        rv_mmap = mmap(addr, 2 * 1024 * 1024, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_FIXED | MAP_PRIVATE | MAP_LOCKED, -1, 0ul);
        attr->type = 6;
        attr->bp_addr = (uint64_t)file;
        fd2 = syscall(__NR_perf_event_open, attr, 0, 0ul, -1, 0ul);
        rv_mmap = mmap(addr, 2 * 1024 * 1024, PROT_READ, MAP_FIXED | MAP_PRIVATE | MAP_LOCKED, fd1, 0ul);
        close(fd2);
}