stress2: Added a syzkaller reproducer. A variation of syzkaller32.sh

tools/test/stress2/misc/all.exclude

@@ -71,6 +71,7 @@ syzkaller29.sh		May change policy for random threads to to domainset_fixed	20210
 syzkaller30.sh		May change policy for random threads to to domainset_fixed	20210104
 syzkaller31.sh		panic: Bad tailq NEXT(0xfffffe0079608f00->tqh_last) != NULL	20210322
 syzkaller32.sh		Fatal trap 18: integer divide fault while in kernel mode	20210322
+syzkaller33.sh		Fatal trap 18: integer divide fault while in kernel mode	20210418
 truss3.sh		WiP								20200915
 unionfs.sh		insmntque: non-locked vp: xx is not exclusive locked...		20130909
 unionfs2.sh		insmntque: mp-safe fs and non-locked vp is not ...		20111219

tools/test/stress2/misc/syzkaller33.sh

@@ -0,0 +1,142 @@
+#!/bin/sh
+
+# Fatal trap 18: integer divide fault while in kernel mode
+# cpuid = 0; apic id = 00
+# instruction pointer     = 0x20:0xffffffff80c310ee
+# stack pointer           = 0x28:0xfffffe0131a629e0
+# frame pointer           = 0x28:0xfffffe0131a62a30
+# code segment            = base 0x0, limit 0xfffff, type 0x1b
+#                         = DPL 0, pres 1, long 1, def32 0, gran 1
+# processor eflags        = interrupt enabled, resume, IOPL = 0
+# current process         = 12 (swi4: clock (0))
+# trap number             = 18
+# panic: integer divide fault
+# cpuid = 0
+# time = 1618722013
+# KDB: stack backtrace:
+# db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe0131a626f0
+# vpanic() at vpanic+0x181/frame 0xfffffe0131a62740
+# panic() at panic+0x43/frame 0xfffffe0131a627a0
+# trap_fatal() at trap_fatal+0x387/frame 0xfffffe0131a62800
+# trap() at trap+0xa4/frame 0xfffffe0131a62910
+# calltrap() at calltrap+0x8/frame 0xfffffe0131a62910
+# --- trap 0x12, rip = 0xffffffff80c310ee, rsp = 0xfffffe0131a629e0, rbp = 0xfffffe0131a62a30 ---
+# realtimer_expire_l() at realtimer_expire_l+0xee/frame 0xfffffe0131a62a30
+# softclock_call_cc() at softclock_call_cc+0x15d/frame 0xfffffe0131a62b00
+# softclock() at softclock+0x66/frame 0xfffffe0131a62b20
+# ithread_loop() at ithread_loop+0x279/frame 0xfffffe0131a62bb0
+# fork_exit() at fork_exit+0x80/frame 0xfffffe0131a62bf0
+# fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe0131a62bf0
+# --- trap 0, rip = 0, rsp = 0, rbp = 0 ---
+# KDB: enter: panic
+# [ thread pid 12 tid 100161 ]
+# Stopped at      kdb_enter+0x37: movq    $0,0x1283f9e(%rip)
+# db> x/s version
+# version: FreeBSD 14.0-CURRENT #0 main-n246123-21afed4b1d1-dirty: Sat Apr 17 07:39:42 CEST 2021
+# pho@t2.osted.lan:/usr/src/sys/amd64/compile/PHO
+# db>
+
+[ `uname -p` != "amd64" ] && exit 0
+
+../default.cfg
+cat > /tmp/syzkaller33.c <<EOF
+// https://syzkaller.appspot.com/bug?id=38b58493445d524070d1a7cd73612f8cc9d01f39
+// autogenerated by syzkaller (https://github.com/google/syzkaller)
+// Reported-by: syzbot+5ab360bd3d3e3c5a6e0e@syzkaller.appspotmail.com
+
+#define _GNU_SOURCE
+
+#include <sys/types.h>
+
+#include <pwd.h>
+#include <signal.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/endian.h>
+#include <sys/syscall.h>
+#include <sys/wait.h>
+#include <time.h>
+#include <unistd.h>
+
+static void kill_and_wait(int pid, int* status)
+{
+  kill(pid, SIGKILL);
+  while (waitpid(-1, status, 0) != pid) {
+  }
+}
+
+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 execute_one(void);
+
+#define WAIT_FLAGS 0
+
+static void loop(void)
+{
+  int iter = 0;
+  for (;; iter++) {
+    int pid = fork();
+    if (pid < 0)
+      exit(1);
+    if (pid == 0) {
+      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 < 5000) {
+        continue;
+      }
+      kill_and_wait(pid, &status);
+      break;
+    }
+  }
+}
+
+uint64_t r[1] = {0x0};
+
+void execute_one(void)
+{
+  intptr_t res = 0;
+  res = syscall(SYS_ktimer_create, 0ul, 0ul, 0x200011c0ul);
+  if (res != -1)
+    r[0] = *(uint32_t*)0x200011c0;
+  *(uint64_t*)0x20001200 = 0x800000000000000;
+  *(uint64_t*)0x20001208 = 0;
+  *(uint64_t*)0x20001210 = 0;
+  *(uint64_t*)0x20001218 = 0xa2b;
+  syscall(SYS_ktimer_settime, r[0], 1ul, 0x20001200ul, 0ul);
+}
+int main(void)
+{
+  syscall(SYS_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x1012ul, -1, 0ul);
+  loop();
+  return 0;
+}
+EOF
+mycc -o /tmp/syzkaller33 -Wall -Wextra -O0 /tmp/syzkaller33.c ||
+    exit 1
+
+(cd /tmp; timeout 3m ./syzkaller33)
+
+rm -rf /tmp/syzkaller33 syzkaller33.c /tmp/syzkaller.*
+exit 0