// https://syzkaller.appspot.com/bug?id=a174cc81e1864137a961f23b7efa47432115c7ec
// 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/mount.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[1] = {0xffffffffffffffff};

int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200001000000ul, /*len=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-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)) {
  }
  //  mknodat$md arguments: [
  //    dirfd: const = 0xffffffffffffff9c (8 bytes)
  //    file: ptr[in, buffer] {
  //      buffer: {2e 2f 6d 64 30 00} (length 0x6)
  //    }
  //    mode: const = 0x6180 (8 bytes)
  //    dev: proc = 0x0 (4 bytes)
  //  ]
  NONFAILING(memcpy((void*)0x2000000001c0, "./md0\000", 6));
  syscall(__NR_mknodat, /*dirfd=*/0xffffffffffffff9cul,
          /*file=*/0x2000000001c0ul, /*mode=*/0x6180ul, /*dev=*/0x900);
  //  openat$md_node arguments: [
  //    fd: const = 0xffffffffffffff9c (8 bytes)
  //    file: ptr[in, buffer] {
  //      buffer: {2e 2f 6d 64 30 00} (length 0x6)
  //    }
  //    flags: md_open_flags = 0x2 (4 bytes)
  //    mode: const = 0x0 (2 bytes)
  //  ]
  //  returns fd_md
  NONFAILING(memcpy((void*)0x200000000200, "./md0\000", 6));
  res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul,
                /*file=*/0x200000000200ul, /*flags=O_RDWR*/ 2, /*mode=*/0);
  if (res != -1)
    r[0] = res;
  //  mprotect arguments: [
  //    addr: VMA[0xf000]
  //    len: len = 0xf000 (8 bytes)
  //    prot: mmap_prot = 0x1 (8 bytes)
  //  ]
  syscall(__NR_mprotect, /*addr=*/0x200000000000ul, /*len=*/0xf000ul,
          /*prot=PROT_READ*/ 1ul);
  //  ioctl$ADD_NEW_DISK arguments: [
  //    fd: fd_md (resource)
  //    cmd: const = 0x40140921 (4 bytes)
  //    arg: ptr[in, mdu_disk_info_t] {
  //      mdu_disk_info_t {
  //        number: int32 = 0x1 (4 bytes)
  //        dev: md_member_dev {
  //          major: const = 0x1 (4 bytes)
  //          minor: proc = 0x1 (4 bytes)
  //        }
  //        raid_disk: int32 = 0x1 (4 bytes)
  //        state: md_disk_state = 0x6 (4 bytes)
  //      }
  //    }
  //  ]
  NONFAILING(*(uint32_t*)0x200000000240 = 1);
  NONFAILING(*(uint32_t*)0x200000000244 = 1);
  NONFAILING(*(uint32_t*)0x200000000248 = 1);
  NONFAILING(*(uint32_t*)0x20000000024c = 1);
  NONFAILING(*(uint32_t*)0x200000000250 = 6);
  syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0x40140921,
          /*arg=*/0x200000000240ul);
  //  ioctl$STOP_ARRAY arguments: [
  //    fd: fd_md (resource)
  //    cmd: const = 0x932 (4 bytes)
  //    arg: const = 0x0 (8 bytes)
  //  ]
  syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0x932, /*arg=*/0ul);
  return 0;
}