syzkaller-repros/linux/d2ab3c966be4cc892b5f0948f5b941da2311609c.c

// possible deadlock in perf_trace_destroy
// https://syzkaller.appspot.com/bug?id=d2ab3c966be4cc892b5f0948f5b941da2311609c
// status:invalid
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <errno.h>
#include <pthread.h>
#include <setjmp.h>
#include <signal.h>
#include <signal.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <string.h>
#include <sys/prctl.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

const int kFailStatus = 67;
const int kRetryStatus = 69;

__attribute__((noreturn)) static void doexit(int status)
{
  volatile unsigned i;
  syscall(__NR_exit_group, status);
  for (i = 0;; i++) {
  }
}

__attribute__((noreturn)) static void fail(const char* msg, ...)
{
  int e = errno;
  fflush(stdout);
  va_list args;
  va_start(args, msg);
  vfprintf(stderr, msg, args);
  va_end(args);
  fprintf(stderr, " (errno %d)\n", e);
  doexit((e == ENOMEM || e == EAGAIN) ? kRetryStatus : kFailStatus);
}

__attribute__((noreturn)) static void exitf(const char* msg, ...)
{
  int e = errno;
  fflush(stdout);
  va_list args;
  va_start(args, msg);
  vfprintf(stderr, msg, args);
  va_end(args);
  fprintf(stderr, " (errno %d)\n", e);
  doexit(kRetryStatus);
}

static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* uctx)
{
  uintptr_t addr = (uintptr_t)info->si_addr;
  const uintptr_t prog_start = 1 << 20;
  const uintptr_t prog_end = 100 << 20;
  if (__atomic_load_n(&skip_segv, __ATOMIC_RELAXED) &&
      (addr < prog_start || addr > prog_end)) {
    _longjmp(segv_env, 1);
  }
  doexit(sig);
  for (;;) {
  }
}

static void install_segv_handler()
{
  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(...)                                                \
  {                                                                    \
    __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST);               \
    if (_setjmp(segv_env) == 0) {                                      \
      __VA_ARGS__;                                                     \
    }                                                                  \
    __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST);               \
  }

static uint64_t current_time_ms()
{
  struct timespec ts;

  if (clock_gettime(CLOCK_MONOTONIC, &ts))
    fail("clock_gettime failed");
  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}

static void test();

void loop()
{
  int iter;
  for (iter = 0;; iter++) {
    int pid = fork();
    if (pid < 0)
      fail("clone failed");
    if (pid == 0) {
      prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
      setpgrp();
      test();
      doexit(0);
    }
    int status = 0;
    uint64_t start = current_time_ms();
    for (;;) {
      int res = waitpid(-1, &status, __WALL | WNOHANG);
      if (res == pid)
        break;
      usleep(1000);
      if (current_time_ms() - start > 5 * 1000) {
        kill(-pid, SIGKILL);
        kill(pid, SIGKILL);
        while (waitpid(-1, &status, __WALL) != pid) {
        }
        break;
      }
    }
  }
}

long r[90];
void* thr(void* arg)
{
  switch ((long)arg) {
  case 0:
    r[0] = syscall(__NR_mmap, 0x20000000ul, 0xfff000ul, 0x3ul, 0x32ul,
                   0xfffffffffffffffful, 0x0ul);
    break;
  case 1:
    NONFAILING(*(uint32_t*)0x20045147 = (uint32_t)0x2);
    NONFAILING(*(uint32_t*)0x2004514b = (uint32_t)0x78);
    NONFAILING(*(uint8_t*)0x2004514f = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045150 = (uint8_t)0x303);
    NONFAILING(*(uint8_t*)0x20045151 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045152 = (uint8_t)0x0);
    NONFAILING(*(uint32_t*)0x20045153 = (uint32_t)0x0);
    NONFAILING(*(uint64_t*)0x20045157 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x2004515f = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20045167 = (uint64_t)0x0);
    NONFAILING(*(uint8_t*)0x2004516f = (uint8_t)0x9bb0af8aaa049dec);
    NONFAILING(*(uint8_t*)0x20045170 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045171 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045172 = (uint8_t)0x0);
    NONFAILING(*(uint32_t*)0x20045173 = (uint32_t)0x0);
    NONFAILING(*(uint32_t*)0x20045177 = (uint32_t)0x0);
    NONFAILING(*(uint32_t*)0x2004517b = (uint32_t)0x4);
    NONFAILING(*(uint64_t*)0x2004517f = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20045187 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x2004518f = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20045197 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x2004519f = (uint64_t)0x0);
    NONFAILING(*(uint32_t*)0x200451a7 = (uint32_t)0x0);
    NONFAILING(*(uint64_t*)0x200451af = (uint64_t)0x0);
    NONFAILING(*(uint32_t*)0x200451b7 = (uint32_t)0x0);
    NONFAILING(*(uint16_t*)0x200451bb = (uint16_t)0x0);
    NONFAILING(*(uint16_t*)0x200451bd = (uint16_t)0x0);
    r[28] = syscall(__NR_perf_event_open, 0x20045147ul, 0x0ul, 0x0ul,
                    0xfffffffffffffffful, 0x0ul);
    break;
  case 2:
    r[29] = syscall(__NR_mmap, 0x20007000ul, 0x2000ul, 0x1ul, 0x11ul,
                    r[28], 0x0ul);
    break;
  case 3:
    NONFAILING(*(uint32_t*)0x2001d000 = (uint32_t)0x2);
    NONFAILING(*(uint32_t*)0x2001d004 = (uint32_t)0x78);
    NONFAILING(*(uint8_t*)0x2001d008 = (uint8_t)0x7ff);
    NONFAILING(*(uint8_t*)0x2001d009 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x2001d00a = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x2001d00b = (uint8_t)0x0);
    NONFAILING(*(uint32_t*)0x2001d00c = (uint32_t)0x0);
    NONFAILING(*(uint64_t*)0x2001d010 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x2001d018 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x2001d020 = (uint64_t)0x0);
    NONFAILING(*(uint8_t*)0x2001d028 = (uint8_t)0x9bb0af8aaa049dec);
    NONFAILING(*(uint8_t*)0x2001d029 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x2001d02a = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x2001d02b = (uint8_t)0x0);
    NONFAILING(*(uint32_t*)0x2001d02c = (uint32_t)0x0);
    NONFAILING(*(uint32_t*)0x2001d030 = (uint32_t)0x0);
    NONFAILING(*(uint32_t*)0x2001d034 = (uint32_t)0x0);
    NONFAILING(*(uint64_t*)0x2001d038 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x2001d040 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x2001d048 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x2001d050 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x2001d058 = (uint64_t)0x0);
    NONFAILING(*(uint32_t*)0x2001d060 = (uint32_t)0x0);
    NONFAILING(*(uint64_t*)0x2001d068 = (uint64_t)0x0);
    NONFAILING(*(uint32_t*)0x2001d070 = (uint32_t)0x0);
    NONFAILING(*(uint16_t*)0x2001d074 = (uint16_t)0x0);
    NONFAILING(*(uint16_t*)0x2001d076 = (uint16_t)0x0);
    r[57] = syscall(__NR_perf_event_open, 0x2001d000ul, 0x0ul, 0x0ul,
                    r[28], 0x3ul);
    break;
  case 4:
    NONFAILING(*(uint32_t*)0x206ba000 = (uint32_t)0xffffffffffffffff);
    NONFAILING(*(uint16_t*)0x206ba004 = (uint16_t)0x1001);
    NONFAILING(*(uint16_t*)0x206ba006 = (uint16_t)0x0);
    NONFAILING(*(uint32_t*)0x206ba008 = (uint32_t)0xffffffffffffffff);
    NONFAILING(*(uint16_t*)0x206ba00c = (uint16_t)0x43);
    NONFAILING(*(uint16_t*)0x206ba00e = (uint16_t)0x0);
    NONFAILING(*(uint32_t*)0x206ba010 = r[57]);
    NONFAILING(*(uint16_t*)0x206ba014 = (uint16_t)0x7fff);
    NONFAILING(*(uint16_t*)0x206ba016 = (uint16_t)0x0);
    NONFAILING(*(uint32_t*)0x206ba018 = (uint32_t)0xffffffffffffffff);
    NONFAILING(*(uint16_t*)0x206ba01c = (uint16_t)0x200);
    NONFAILING(*(uint16_t*)0x206ba01e = (uint16_t)0x0);
    NONFAILING(*(uint32_t*)0x206ba020 = (uint32_t)0xffffffffffffffff);
    NONFAILING(*(uint16_t*)0x206ba024 = (uint16_t)0x1000);
    NONFAILING(*(uint16_t*)0x206ba026 = (uint16_t)0x0);
    NONFAILING(*(uint32_t*)0x206ba028 = r[28]);
    NONFAILING(*(uint16_t*)0x206ba02c = (uint16_t)0x8000);
    NONFAILING(*(uint16_t*)0x206ba02e = (uint16_t)0x0);
    NONFAILING(*(uint32_t*)0x206ba030 = (uint32_t)0xffffffffffffffff);
    NONFAILING(*(uint16_t*)0x206ba034 = (uint16_t)0x0);
    NONFAILING(*(uint16_t*)0x206ba036 = (uint16_t)0x0);
    NONFAILING(*(uint32_t*)0x206ba038 = (uint32_t)0xffffffffffffffff);
    NONFAILING(*(uint16_t*)0x206ba03c = (uint16_t)0x2);
    NONFAILING(*(uint16_t*)0x206ba03e = (uint16_t)0x0);
    NONFAILING(*(uint32_t*)0x206ba040 = r[57]);
    NONFAILING(*(uint16_t*)0x206ba044 = (uint16_t)0x2000);
    NONFAILING(*(uint16_t*)0x206ba046 = (uint16_t)0x0);
    NONFAILING(*(uint32_t*)0x206ba048 = r[28]);
    NONFAILING(*(uint16_t*)0x206ba04c = (uint16_t)0x20);
    NONFAILING(*(uint16_t*)0x206ba04e = (uint16_t)0x0);
    r[88] = syscall(__NR_poll, 0x206ba000ul, 0xaul, 0x800fffffffful);
    break;
  case 5:
    r[89] = syscall(__NR_dup3, r[28], r[57], 0x80000ul);
    break;
  }
  return 0;
}

void test()
{
  long i;
  pthread_t th[12];

  memset(r, -1, sizeof(r));
  srand(getpid());
  for (i = 0; i < 6; i++) {
    pthread_create(&th[i], 0, thr, (void*)i);
    usleep(rand() % 10000);
  }
  for (i = 0; i < 6; i++) {
    pthread_create(&th[6 + i], 0, thr, (void*)i);
    if (rand() % 2)
      usleep(rand() % 10000);
  }
  usleep(rand() % 100000);
}

int main()
{
  int i;
  for (i = 0; i < 8; i++) {
    if (fork() == 0) {
      install_segv_handler();
      loop();
      return 0;
    }
  }
  sleep(1000000);
  return 0;
}