1#!/bin/sh 2 3# panic: Bad link elm 0xfffff8001a83db00 prev->next != elm 4# cpuid = 21 5# time = 1605387390 6# KDB: stack backtrace: 7# db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe0100a983e0 8# vpanic() at vpanic+0x182/frame 0xfffffe0100a98430 9# panic() at panic+0x43/frame 0xfffffe0100a98490 10# _callout_stop_safe() at _callout_stop_safe+0x726/frame 0xfffffe0100a98520 11# filt_timerdetach() at filt_timerdetach+0x20/frame 0xfffffe0100a98540 12# kqueue_drain() at kqueue_drain+0x2c8/frame 0xfffffe0100a98580 13# kqueue_close() at kqueue_close+0x7d/frame 0xfffffe0100a985c0 14# _fdrop() at _fdrop+0x1b/frame 0xfffffe0100a985e0 15# closef() at closef+0x1ea/frame 0xfffffe0100a98670 16# fdescfree_fds() at fdescfree_fds+0x8c/frame 0xfffffe0100a986d0 17# fdescfree() at fdescfree+0x3cd/frame 0xfffffe0100a987a0 18# exit1() at exit1+0x487/frame 0xfffffe0100a98810 19# sigexit() at sigexit+0x15c/frame 0xfffffe0100a98ae0 20# postsig() at postsig+0x2cc/frame 0xfffffe0100a98bb0 21# ast() at ast+0x5eb/frame 0xfffffe0100a98bf0 22# doreti_ast() at doreti_ast+0x1f/frame 0x7fffffffe570 23# KDB: enter: panic 24# [ thread pid 82279 tid 100717 ] 25# Stopped at kdb_enter+0x37: movq $0,0x10aa7f6(%rip) 26# db> x/s version 27# version: FreeBSD 13.0-CURRENT #0 r367672: Sat Nov 14 08:42:14 CET 2020 28# pho@t2.osted.lan:/usr/src/sys/amd64/compile/PHO 29# db> 30 31[ `uname -p` != "amd64" ] && exit 0 32 33# Fixed by r367849 34 35. ../default.cfg 36cat > /tmp/syzkaller26.c <<EOF 37// https://syzkaller.appspot.com/bug?id=95ac7e30218c63bc9322b1dd775101f8f88de4ff 38// autogenerated by syzkaller (https://github.com/google/syzkaller) 39// Reported-by: syzbot+1b27e0237aa22d8adffa@syzkaller.appspotmail.com 40 41#define _GNU_SOURCE 42 43#include <sys/types.h> 44 45#include <pwd.h> 46#include <signal.h> 47#include <stdarg.h> 48#include <stdbool.h> 49#include <stdint.h> 50#include <stdio.h> 51#include <stdlib.h> 52#include <string.h> 53#include <sys/endian.h> 54#include <sys/syscall.h> 55#include <sys/wait.h> 56#include <time.h> 57#include <unistd.h> 58 59static void kill_and_wait(int pid, int* status) 60{ 61 kill(pid, SIGKILL); 62 while (waitpid(-1, status, 0) != pid) { 63 } 64} 65 66static void sleep_ms(uint64_t ms) 67{ 68 usleep(ms * 1000); 69} 70 71static uint64_t current_time_ms(void) 72{ 73 struct timespec ts; 74 if (clock_gettime(CLOCK_MONOTONIC, &ts)) 75 exit(1); 76 return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000; 77} 78 79static void execute_one(void); 80 81#define WAIT_FLAGS 0 82 83static void loop(void) 84{ 85 int iter __unused = 0; 86 for (;; iter++) { 87 int pid = fork(); 88 if (pid < 0) 89 exit(1); 90 if (pid == 0) { 91 execute_one(); 92 exit(0); 93 } 94 int status = 0; 95 uint64_t start = current_time_ms(); 96 for (;;) { 97 if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid) 98 break; 99 sleep_ms(1); 100 if (current_time_ms() - start < 5 * 1000) 101 continue; 102 kill_and_wait(pid, &status); 103 break; 104 } 105 } 106} 107 108uint64_t r[1] = {0xffffffffffffffff}; 109 110void execute_one(void) 111{ 112 intptr_t res = 0; 113 res = syscall(SYS_kqueue); 114 if (res != -1) 115 r[0] = res; 116 *(uint64_t*)0x20000000 = 3; 117 *(uint16_t*)0x20000008 = 0xfff3; 118 *(uint16_t*)0x2000000a = 0x4000; 119 *(uint32_t*)0x2000000c = 0x1000000; 120 *(uint64_t*)0x20000010 = 0xe; 121 *(uint64_t*)0x20000018 = 0xff; 122 *(uint64_t*)0x20000020 = 2; 123 *(uint64_t*)0x20000028 = 2; 124 *(uint64_t*)0x20000030 = 4; 125 *(uint64_t*)0x20000038 = 0xffffffffffffff90; 126 *(uint64_t*)0x20000040 = 0x101; 127 *(uint16_t*)0x20000048 = 0xfff6; 128 *(uint16_t*)0x2000004a = 0x22; 129 *(uint32_t*)0x2000004c = 0x20; 130 *(uint64_t*)0x20000050 = 0xe1; 131 *(uint64_t*)0x20000058 = -1; 132 *(uint64_t*)0x20000060 = 0x81; 133 *(uint64_t*)0x20000068 = 4; 134 *(uint64_t*)0x20000070 = 0x8000; 135 *(uint64_t*)0x20000078 = 9; 136 *(uint64_t*)0x20000080 = 0; 137 *(uint16_t*)0x20000088 = 0xfff9; 138 *(uint16_t*)0x2000008a = 0xefc9; 139 *(uint32_t*)0x2000008c = 4; 140 *(uint64_t*)0x20000090 = 0; 141 *(uint64_t*)0x20000098 = 0x400; 142 *(uint64_t*)0x200000a0 = 0x2e77; 143 *(uint64_t*)0x200000a8 = 2; 144 *(uint64_t*)0x200000b0 = 0x7fffffff; 145 *(uint64_t*)0x200000b8 = 7; 146 syscall(SYS_kevent, r[0], 0x20000000ul, 3ul, 0x200000c0ul, 9ul, 0ul); 147} 148int main(void) 149{ 150 sleep(2); /* pho */ 151 syscall(SYS_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x1012ul, -1, 0ul); 152 loop(); 153 return 0; 154} 155EOF 156mycc -o /tmp/syzkaller26 -Wall -Wextra -O0 /tmp/syzkaller26.c || 157 exit 1 158 159(cd ../testcases/swap; ./swap -t 1m -i 20 -h > /dev/null 2>&1) & 160for i in `jot 256`; do 161 (cd /tmp; timeout 3m ./syzkaller26) & 162done 163wait 164 165rm -rf /tmp/syzkaller26 /tmp/syzkaller26.c /tmp/syzkaller.* 166exit 0 167