stress2: Added a syzkaller reproducer

tools/test/stress2/misc/syzkaller63.sh

@@ -0,0 +1,75 @@
+#!/bin/sh
+
+# Fatal trap 12: page fault while in kernel mode
+# cpuid = 1; apic id = 01
+# fault virtual address   = 0x20
+# fault code              = supervisor read data, page not present
+# instruction pointer     = 0x20:0xfa1a2c
+# stack pointer           = 0x28:0x27a41a80
+# frame pointer           = 0x28:0x27a41a98
+# code segment            = base 0x0, limit 0xfffff, type 0x1b
+#                         = DPL 0, pres 1, def32 1, gran 1
+# processor eflags        = interrupt enabled, resume, IOPL = 0
+# current process         = 804 (syzkaller63)
+# trap number             = 12
+# panic: page fault
+# cpuid = 1
+# time = 1675071979
+# KDB: stack backtrace:
+# db_trace_self_wrapper(d,2048e3a0,27a41a40,20,c,...) at db_trace_self_wrapper+0x28/frame 0x27a418d0
+# vpanic(146c355,27a4190c,27a4190c,27a41938,141f1d6,...) at vpanic+0xf4/frame 0x27a418ec
+# panic(146c355,15010e8,0,fffff,1dfc39b,...) at panic+0x14/frame 0x27a41900
+# trap_fatal(2048e3a0,2048e3a0,27a4196c,1008e0a,18cd6638,...) at trap_fatal+0x346/frame 0x27a41938
+# trap_pfault(20,0,0) at trap_pfault+0x6f/frame 0x27a4196c
+# trap(27a41a40,8,28,28,0,...) at trap+0x31b/frame 0x27a41a34
+# calltrap() at 0xffc0321f/frame 0x27a41a34
+# --- trap 0xc, eip = 0xfa1a2c, esp = 0x27a41a80, ebp = 0x27a41a98 ---
+# kern_cpuset_getid(141f60e,0,9,0,0,0) at kern_cpuset_getid+0x10c/frame 0x27a41a98
+# sys_cpuset_getid(2048e3a0,2048e644,2048e3a0,2048e3a0,27a41b9c,...) at sys_cpuset_getid+0x32/frame 0x27a41ac0
+# syscall(27a41ba8,3b,3b,3b,ffbfe9fc,...) at syscall+0x1ef/frame 0x27a41b9c
+# Xint0x80_syscall() at 0xffc03479/frame 0x27a41b9c
+# --- syscall (486, FreeBSD ELF32, cpuset_getid), eip = 0x2056317d, esp = 0xffbfe990, ebp = 0xffbfe9b0 ---
+# KDB: enter: panic
+# [ thread pid 804 tid 100092 ]
+# Stopped at      kdb_enter+0x34: movl    $0,kdb_why
+# db> x/s version
+# version: FreeBSD 14.0-CURRENT #0 main-n260354-34b867ca30479: Mon Jan 30 07:26:30 CET 2023
+# pho@mercat1.netperf.freebsd.org:/mnt25/obj/usr/src/i386.i386/sys/PHO
+# db>
+
+. ../default.cfg
+prog=$(basename "$0" .sh)
+[ `uname -p` = "i386" ] || exit 0
+
+cat > /tmp/$prog.c <<EOF
+// https://syzkaller.appspot.com/bug?id=69dd3c8d867306dd9f97e2dae6ab1557fd8d2679
+// autogenerated by syzkaller (https://github.com/google/syzkaller)
+// Reported-by: syzbot+331e8402e0f7347f0f2a@syzkaller.appspotmail.com
+
+#define _GNU_SOURCE
+
+#include <pwd.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 <unistd.h>
+
+int main(void)
+{
+  syscall(SYS_mmap, 0x10000000, 0x1000000, 7, 0x1012, -1, 0);
+  syscall(SYS_cpuset_getid, 0, 9, 0ull, 0);
+  return 0;
+}
+EOF
+mycc -o /tmp/$prog -Wall -Wextra -O0 /tmp/$prog.c || exit 1
+
+(cd /tmp; timeout -k 3s 2s ./$prog)
+
+rm -rf /tmp/$prog /tmp/$prog.c /tmp/$prog.core \
+    /tmp/syzkaller.??????
+exit 0