#!/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
