1#!/bin/sh 2 3[ `uname -p` != "amd64" ] && exit 0 4[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1 5 6# panic: Assertion lock == sq->sq_lock failed at ../../../kern/subr_sleepqueue.c:371 7# cpuid = 1 8# time = 1623487895 9# KDB: stack backtrace: 10# db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe06c14b4700 11# vpanic() at vpanic+0x181/frame 0xfffffe06c14b4750 12# panic() at panic+0x43/frame 0xfffffe06c14b47b0 13# sleepq_add() at sleepq_add+0x3e6/frame 0xfffffe06c14b4800 14# _sleep() at _sleep+0x20e/frame 0xfffffe06c14b48b0 15# kern_sigtimedwait() at kern_sigtimedwait+0x532/frame 0xfffffe06c14b4a20 16# sys_sigwaitinfo() at sys_sigwaitinfo+0x43/frame 0xfffffe06c14b4ac0 17# amd64_syscall() at amd64_syscall+0x147/frame 0xfffffe06c14b4bf0 18# fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe06c14b4bf0 19# --- syscall (0, FreeBSD ELF64, nosys), rip = 0x8003af5fa, rsp = 0x7fffffffe5f8, rbp = 0x7fffffffe610 --- 20# KDB: enter: panic 21# [ thread pid 15370 tid 356127 ] 22# Stopped at kdb_enter+0x37: movq $0,0x1285b4e(%rip) 23# db> x/s version 24# version: FreeBSD 14.0-CURRENT #0 main-n247326-2349cda44fea: Sat Jun 12 03:57:33 CEST 2021 25# pho@mercat1.netperf.freebsd.org:/usr/src/sys/amd64/compile/PHO 26# db> 27 28. ../default.cfg 29cat > /tmp/syzkaller42.c <<EOF 30// https://syzkaller.appspot.com/bug?id=b12f0c4dc1e73c25636e4c4d4787209d155cca0a 31// autogenerated by syzkaller (https://github.com/google/syzkaller) 32// Reported-by: syzbot+1d89fc2a9ef92ef64fa8@syzkaller.appspotmail.com 33 34#define _GNU_SOURCE 35 36#include <sys/types.h> 37 38#include <pwd.h> 39#include <signal.h> 40#include <stdarg.h> 41#include <stdbool.h> 42#include <stdint.h> 43#include <stdio.h> 44#include <stdlib.h> 45#include <string.h> 46#include <sys/endian.h> 47#include <sys/syscall.h> 48#include <sys/wait.h> 49#include <time.h> 50#include <unistd.h> 51 52static void kill_and_wait(int pid, int* status) 53{ 54 kill(pid, SIGKILL); 55 while (waitpid(-1, status, 0) != pid) { 56 } 57} 58 59static void sleep_ms(uint64_t ms) 60{ 61 usleep(ms * 1000); 62} 63 64static uint64_t current_time_ms(void) 65{ 66 struct timespec ts; 67 if (clock_gettime(CLOCK_MONOTONIC, &ts)) 68 exit(1); 69 return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000; 70} 71 72static void execute_one(void); 73 74#define WAIT_FLAGS 0 75 76static void loop(void) 77{ 78 int iter = 0; 79 for (;; iter++) { 80 int pid = fork(); 81 if (pid < 0) 82 exit(1); 83 if (pid == 0) { 84 execute_one(); 85 exit(0); 86 } 87 int status = 0; 88 uint64_t start = current_time_ms(); 89 for (;;) { 90 if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid) 91 break; 92 sleep_ms(1); 93 if (current_time_ms() - start < 5000) { 94 continue; 95 } 96 kill_and_wait(pid, &status); 97 break; 98 } 99 } 100} 101 102void execute_one(void) 103{ 104 syscall(SYS_rfork, 0x14034ul); 105 *(uint32_t*)0x20000140 = 0x80000002; 106 *(uint32_t*)0x20000144 = 0xfffffff7; 107 *(uint32_t*)0x20000148 = 0x41; 108 *(uint32_t*)0x2000014c = 3; 109 syscall(SYS_sigwaitinfo, 0x20000140ul, 0ul); 110} 111int main(void) 112{ 113 syscall(SYS_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x1012ul, -1, 0ul); 114 loop(); 115 return 0; 116} 117EOF 118mycc -o /tmp/syzkaller42 -Wall -Wextra -O0 /tmp/syzkaller42.c -lpthread || 119 exit 1 120 121(cd /tmp; timeout 3m ./syzkaller42) 122 123rm -rf /tmp/syzkaller42 /tmp/syzkaller42.c /tmp/syzkaller.* 124exit 0 125