syzkaller-repros/linux/9a0eb4f98460dffec2def9922f3ca913d0389f10.c

// KMSAN: uninit-value in __save_stack_trace
// https://syzkaller.appspot.com/bug?id=9a0eb4f98460dffec2def9922f3ca913d0389f10
// status:invalid
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <fcntl.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <unistd.h>

static uintptr_t syz_open_procfs(uintptr_t a0, uintptr_t a1)
{

  char buf[128];
  memset(buf, 0, sizeof(buf));
  if (a0 == 0) {
    snprintf(buf, sizeof(buf), "/proc/self/%s", (char*)a1);
  } else if (a0 == (uintptr_t)-1) {
    snprintf(buf, sizeof(buf), "/proc/thread-self/%s", (char*)a1);
  } else {
    snprintf(buf, sizeof(buf), "/proc/self/task/%d/%s", (int)a0, (char*)a1);
  }
  int fd = open(buf, O_RDWR);
  if (fd == -1)
    fd = open(buf, O_RDONLY);
  return fd;
}

uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff};
void loop()
{
  long res = 0;
  res = syscall(__NR_socket, 0x26, 5, 0);
  if (res != -1)
    r[0] = res;
  memcpy((void*)0x20000100, "wchan", 6);
  res = syz_open_procfs(0, 0x20000100);
  if (res != -1)
    r[1] = res;
  *(uint16_t*)0x20000080 = 0x26;
  memcpy((void*)0x20000082,
         "\x68\x61\x73\x68\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 14);
  *(uint32_t*)0x20000090 = 0;
  *(uint32_t*)0x20000094 = 0;
  memcpy((void*)0x20000098,
         "\x73\x68\x61\x32\x32\x34\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
         "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
         "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
         "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
         64);
  syscall(__NR_bind, r[0], 0x20000080, 0x58);
  res = syscall(__NR_accept4, r[0], 0, 0, 0);
  if (res != -1)
    r[2] = res;
  *(uint64_t*)0x20a2effc = 0;
  syscall(__NR_sendfile, r[2], r[1], 0x20a2effc, 0x1000);
}

int main()
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  loop();
  return 0;
}