// https://syzkaller.appspot.com/bug?id=4f94742c0ef80b9ac04a6cf031fefa4302671e12
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <setjmp.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>

static __thread int clone_ongoing;
static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* ctx)
{
  if (__atomic_load_n(&clone_ongoing, __ATOMIC_RELAXED) != 0) {
    exit(sig);
  }
  uintptr_t addr = (uintptr_t)info->si_addr;
  const uintptr_t prog_start = 1 << 20;
  const uintptr_t prog_end = 100 << 20;
  int skip = __atomic_load_n(&skip_segv, __ATOMIC_RELAXED) != 0;
  int valid = addr < prog_start || addr > prog_end;
  if (skip && valid) {
    _longjmp(segv_env, 1);
  }
  exit(sig);
}

static void install_segv_handler(void)
{
  struct sigaction sa;
  memset(&sa, 0, sizeof(sa));
  sa.sa_handler = SIG_IGN;
  syscall(SYS_rt_sigaction, 0x20, &sa, NULL, 8);
  syscall(SYS_rt_sigaction, 0x21, &sa, NULL, 8);
  memset(&sa, 0, sizeof(sa));
  sa.sa_sigaction = segv_handler;
  sa.sa_flags = SA_NODEFER | SA_SIGINFO;
  sigaction(SIGSEGV, &sa, NULL);
  sigaction(SIGBUS, &sa, NULL);
}

#define NONFAILING(...)                                                        \
  ({                                                                           \
    int ok = 1;                                                                \
    __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    if (_setjmp(segv_env) == 0) {                                              \
      __VA_ARGS__;                                                             \
    } else                                                                     \
      ok = 0;                                                                  \
    __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    ok;                                                                        \
  })

uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff};

int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  const char* reason;
  (void)reason;
  install_segv_handler();
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  NONFAILING(memcpy((void*)0x20000040, "./file0\000", 8));
  syscall(__NR_mkdirat, /*fd=*/0xffffff9c, /*path=*/0x20000040ul, /*mode=*/0ul);
  NONFAILING(memcpy((void*)0x200001c0, "syz\000", 4));
  NONFAILING(memcpy((void*)0x20000480, "./file0\000", 8));
  NONFAILING(memcpy((void*)0x200004c0, "9p\000", 3));
  NONFAILING(
      memcpy((void*)0x20000c00,
             "\x56\xc7\x8e\x3c\x73\x3d\x76\x69\x72\x74\x69\x6f\x2c\x6e\x6f\x65"
             "\x78\x74\x65\x6e\x64\x2c\x61\x63\x63\x81\x73\x73\x3d\x61\x6e\x79"
             "\x2c\x63\x61\x63\x68\x65\x3d\x66\x73\x63\x61\x63\x68\x65\x2c\x76"
             "\x65\x72\x73\x69\x6f\x6e\x3d\x39\x70\x32\x30\x30\x30\x2e\x75",
             63));
  syscall(__NR_mount, /*src=*/0x200001c0ul, /*dst=*/0x20000480ul,
          /*type=*/0x200004c0ul, /*flags=*/0ul, /*opts=*/0x20000c00ul);
  NONFAILING(memcpy((void*)0x20000400, "./file0\000", 8));
  syscall(__NR_chdir, /*dir=*/0x20000400ul);
  res = syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0ul,
                /*flags=*/0x275aul, /*mode=*/0ul);
  if (res != -1)
    r[0] = res;
  syscall(__NR_socket, /*domain=*/0xaul, /*type=*/1ul, /*proto=*/0);
  syscall(__NR_sendmsg, /*fd=*/r[0], /*msg=*/0ul, /*f=*/0ul);
  NONFAILING(memcpy((void*)0x20000040, "cpuacct.usage_sys\000", 18));
  res = syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x20000040ul,
                /*flags=*/0x275aul, /*mode=*/0ul);
  if (res != -1)
    r[1] = res;
  NONFAILING(memcpy((void*)0x2000e0c0, "#! ", 3));
  NONFAILING(*(uint8_t*)0x2000e0c3 = 0xa);
  syscall(__NR_write, /*fd=*/r[1], /*data=*/0x2000e0c0ul, /*len=*/0x10010ul);
  syscall(__NR_bind, /*fd=*/-1, /*addr=*/0ul, /*addrlen=*/0ul);
  return 0;
}