Add regression test cases for three recent issues

Signed-off-by: Jens Axboe <axboe@kernel.dk>

test/35fa71a030ca-test.c

@@ -0,0 +1,318 @@
+// autogenerated by syzkaller (https://github.com/google/syzkaller)
+
+#include <dirent.h>
+#include <endian.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <pthread.h>
+#include <signal.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/prctl.h>
+#include <sys/stat.h>
+#include <sys/syscall.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <time.h>
+#include <unistd.h>
+
+#include <linux/futex.h>
+
+static void sleep_ms(uint64_t ms)
+{
+  usleep(ms * 1000);
+}
+
+static uint64_t current_time_ms(void)
+{
+  struct timespec ts;
+  if (clock_gettime(CLOCK_MONOTONIC, &ts))
+    exit(1);
+  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
+}
+
+static void thread_start(void* (*fn)(void*), void* arg)
+{
+  pthread_t th;
+  pthread_attr_t attr;
+  pthread_attr_init(&attr);
+  pthread_attr_setstacksize(&attr, 128 << 10);
+  int i;
+  for (i = 0; i < 100; i++) {
+    if (pthread_create(&th, &attr, fn, arg) == 0) {
+      pthread_attr_destroy(&attr);
+      return;
+    }
+    if (errno == EAGAIN) {
+      usleep(50);
+      continue;
+    }
+    break;
+  }
+  exit(1);
+}
+
+typedef struct {
+  int state;
+} event_t;
+
+static void event_init(event_t* ev)
+{
+  ev->state = 0;
+}
+
+static void event_reset(event_t* ev)
+{
+  ev->state = 0;
+}
+
+static void event_set(event_t* ev)
+{
+  if (ev->state)
+    exit(1);
+  __atomic_store_n(&ev->state, 1, __ATOMIC_RELEASE);
+  syscall(SYS_futex, &ev->state, FUTEX_WAKE | FUTEX_PRIVATE_FLAG);
+}
+
+static void event_wait(event_t* ev)
+{
+  while (!__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE))
+    syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, 0);
+}
+
+static int event_isset(event_t* ev)
+{
+  return __atomic_load_n(&ev->state, __ATOMIC_ACQUIRE);
+}
+
+static int event_timedwait(event_t* ev, uint64_t timeout)
+{
+  uint64_t start = current_time_ms();
+  uint64_t now = start;
+  for (;;) {
+    uint64_t remain = timeout - (now - start);
+    struct timespec ts;
+    ts.tv_sec = remain / 1000;
+    ts.tv_nsec = (remain % 1000) * 1000 * 1000;
+    syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, &ts);
+    if (__atomic_load_n(&ev->state, __ATOMIC_RELAXED))
+      return 1;
+    now = current_time_ms();
+    if (now - start > timeout)
+      return 0;
+  }
+}
+
+static bool write_file(const char* file, const char* what, ...)
+{
+  char buf[1024];
+  va_list args;
+  va_start(args, what);
+  vsnprintf(buf, sizeof(buf), what, args);
+  va_end(args);
+  buf[sizeof(buf) - 1] = 0;
+  int len = strlen(buf);
+  int fd = open(file, O_WRONLY | O_CLOEXEC);
+  if (fd == -1)
+    return false;
+  if (write(fd, buf, len) != len) {
+    int err = errno;
+    close(fd);
+    errno = err;
+    return false;
+  }
+  close(fd);
+  return true;
+}
+
+static void kill_and_wait(int pid, int* status)
+{
+  kill(-pid, SIGKILL);
+  kill(pid, SIGKILL);
+  int i;
+  for (i = 0; i < 100; i++) {
+    if (waitpid(-1, status, WNOHANG | __WALL) == pid)
+      return;
+    usleep(1000);
+  }
+  DIR* dir = opendir("/sys/fs/fuse/connections");
+  if (dir) {
+    for (;;) {
+      struct dirent* ent = readdir(dir);
+      if (!ent)
+        break;
+      if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0)
+        continue;
+      char abort[300];
+      snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort",
+               ent->d_name);
+      int fd = open(abort, O_WRONLY);
+      if (fd == -1) {
+        continue;
+      }
+      if (write(fd, abort, 1) < 0) {
+      }
+      close(fd);
+    }
+    closedir(dir);
+  } else {
+  }
+  while (waitpid(-1, status, __WALL) != pid) {
+  }
+}
+
+#define SYZ_HAVE_SETUP_TEST 1
+static void setup_test()
+{
+  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
+  setpgrp();
+  write_file("/proc/self/oom_score_adj", "1000");
+}
+
+struct thread_t {
+  int created, call;
+  event_t ready, done;
+};
+
+static struct thread_t threads[16];
+static void execute_call(int call);
+static int running;
+
+static void* thr(void* arg)
+{
+  struct thread_t* th = (struct thread_t*)arg;
+  for (;;) {
+    event_wait(&th->ready);
+    event_reset(&th->ready);
+    execute_call(th->call);
+    __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
+    event_set(&th->done);
+  }
+  return 0;
+}
+
+static void execute_one(void)
+{
+  int i, call, thread;
+  for (call = 0; call < 3; call++) {
+    for (thread = 0; thread < (int)(sizeof(threads) / sizeof(threads[0]));
+         thread++) {
+      struct thread_t* th = &threads[thread];
+      if (!th->created) {
+        th->created = 1;
+        event_init(&th->ready);
+        event_init(&th->done);
+        event_set(&th->done);
+        thread_start(thr, th);
+      }
+      if (!event_isset(&th->done))
+        continue;
+      event_reset(&th->done);
+      th->call = call;
+      __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
+      event_set(&th->ready);
+      event_timedwait(&th->done, 45);
+      break;
+    }
+  }
+  for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
+    sleep_ms(1);
+}
+
+static void execute_one(void);
+
+#define WAIT_FLAGS __WALL
+
+static void loop(void)
+{
+  int iter;
+  for (iter = 0;; iter++) {
+    int pid = fork();
+    if (pid < 0)
+      exit(1);
+    if (pid == 0) {
+      setup_test();
+      execute_one();
+      exit(0);
+    }
+    int status = 0;
+    uint64_t start = current_time_ms();
+    for (;;) {
+      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
+        break;
+      sleep_ms(1);
+      if (current_time_ms() - start < 5 * 1000)
+        continue;
+      kill_and_wait(pid, &status);
+      break;
+    }
+  }
+}
+
+#ifndef __NR_io_uring_register
+#define __NR_io_uring_register 427
+#endif
+#ifndef __NR_io_uring_setup
+#define __NR_io_uring_setup 425
+#endif
+#ifndef __NR_mmap
+#define __NR_mmap 192
+#endif
+
+uint64_t r[1] = {0xffffffffffffffff};
+
+void execute_call(int call)
+{
+  long res;
+  switch (call) {
+  case 0:
+    *(uint32_t*)0x20000040 = 0;
+    *(uint32_t*)0x20000044 = 0;
+    *(uint32_t*)0x20000048 = 0;
+    *(uint32_t*)0x2000004c = 0;
+    *(uint32_t*)0x20000050 = 0;
+    *(uint32_t*)0x20000054 = 0;
+    *(uint32_t*)0x20000058 = 0;
+    *(uint32_t*)0x2000005c = 0;
+    *(uint32_t*)0x20000060 = 0;
+    *(uint32_t*)0x20000064 = 0;
+    *(uint32_t*)0x20000068 = 0;
+    *(uint32_t*)0x2000006c = 0;
+    *(uint32_t*)0x20000070 = 0;
+    *(uint32_t*)0x20000074 = 0;
+    *(uint32_t*)0x20000078 = 0;
+    *(uint32_t*)0x2000007c = 0;
+    *(uint32_t*)0x20000080 = 0;
+    *(uint32_t*)0x20000084 = 0;
+    *(uint64_t*)0x20000088 = 0;
+    *(uint32_t*)0x20000090 = 0;
+    *(uint32_t*)0x20000094 = 0;
+    *(uint32_t*)0x20000098 = 0;
+    *(uint32_t*)0x2000009c = 0;
+    *(uint32_t*)0x200000a0 = 0;
+    *(uint32_t*)0x200000a4 = 0;
+    *(uint32_t*)0x200000a8 = 0;
+    *(uint32_t*)0x200000ac = 0;
+    *(uint64_t*)0x200000b0 = 0;
+    res = syscall(__NR_io_uring_setup, 0x64, 0x20000040);
+    if (res != -1)
+      r[0] = res;
+    break;
+  case 1:
+    syscall(__NR_io_uring_register, (long)r[0], 0, 0, 0);
+    break;
+  case 2:
+    syscall(__NR_io_uring_register, (long)r[0], 0, 0, 0);
+    break;
+  }
+}
+int main(void)
+{
+  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
+  loop();
+  return 0;
+}