1#!/bin/sh 2 3# panic: Duplicate free of 0xfffff800049ad800 from zone 4# 0xfffff800041e82c0(mbuf) slab 0xfffff800049adf90(8) 5# 6# KDB: stack backtrace: 7# db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 8# 0xfffffe0016b2c4a0 9# vpanic() at vpanic+0x1e0/frame 0xfffffe0016b2c500 10# panic() at panic+0x43/frame 0xfffffe0016b2c560 11# uma_dbg_free() at uma_dbg_free+0x246/frame 0xfffffe0016b2c5b0 12# uma_zfree_arg() at uma_zfree_arg+0x1aa/frame 0xfffffe0016b2c640 13# uipc_ready() at uipc_ready+0x19f/frame 0xfffffe0016b2c690 14# sendfile_iodone() at sendfile_iodone+0x342/frame 0xfffffe0016b2c6f0 15# vnode_pager_generic_getpages_done_async() at 16# vnode_pager_generic_getpages_done_async+0x4a/frame 0xfffffe0016b2c720 17# bufdone() at bufdone+0xa1/frame 0xfffffe0016b2c7a0 18# g_io_deliver() at g_io_deliver+0x35b/frame 0xfffffe0016b2c800 19# g_io_deliver() at g_io_deliver+0x35b/frame 0xfffffe0016b2c860 20# g_io_deliver() at g_io_deliver+0x35b/frame 0xfffffe0016b2c8c0 21# g_disk_done() at g_disk_done+0x179/frame 0xfffffe0016b2c910 22# dadone() at dadone+0x655/frame 0xfffffe0016b2c9a0 23# xpt_done_process() at xpt_done_process+0x5b2/frame 0xfffffe0016b2ca00 24# xpt_done_td() at xpt_done_td+0x175/frame 0xfffffe0016b2ca60 25# fork_exit() at fork_exit+0xb0/frame 0xfffffe0016b2cab0 26# fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe0016b2cab0 27# --- trap 0, rip = 0, rsp = 0, rbp = 0 --- 28 29# Reproduced on r359769 30# Fixed by r359779 31 32[ `uname -p` = "i386" ] && exit 0 33 34. ../default.cfg 35cat > /tmp/syzkaller7.c <<EOF 36// https://syzkaller.appspot.com/bug?id=3a27f6d4656356facc22a9329be797ef1143d0ad 37// autogenerated by syzkaller (https://github.com/google/syzkaller) 38 39#define _GNU_SOURCE 40 41#include <sys/types.h> 42 43#include <pwd.h> 44#include <signal.h> 45#include <stdarg.h> 46#include <stdbool.h> 47#include <stdint.h> 48#include <stdio.h> 49#include <stdlib.h> 50#include <string.h> 51#include <sys/endian.h> 52#include <sys/syscall.h> 53#include <sys/wait.h> 54#include <time.h> 55#include <unistd.h> 56 57static void kill_and_wait(int pid, int* status) 58{ 59 kill(pid, SIGKILL); 60 while (waitpid(-1, status, 0) != pid) { 61 } 62} 63 64static void sleep_ms(uint64_t ms) 65{ 66 usleep(ms * 1000); 67} 68 69static uint64_t current_time_ms(void) 70{ 71 struct timespec ts; 72 if (clock_gettime(CLOCK_MONOTONIC, &ts)) 73 exit(1); 74 return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000; 75} 76 77static void execute_one(void); 78 79#define WAIT_FLAGS 0 80 81static void loop(void) 82{ 83 int iter; 84 for (iter = 0;; iter++) { 85 int pid = fork(); 86 if (pid < 0) 87 exit(1); 88 if (pid == 0) { 89 execute_one(); 90 exit(0); 91 } 92 int status = 0; 93 uint64_t start = current_time_ms(); 94 for (;;) { 95 if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid) 96 break; 97 sleep_ms(1); 98 if (current_time_ms() - start < 5 * 1000) 99 continue; 100 kill_and_wait(pid, &status); 101 break; 102 } 103 } 104} 105 106uint64_t r[5] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 107 0xffffffffffffffff, 0xffffffffffffffff}; 108 109void execute_one(void) 110{ 111 long res = 0; 112 memcpy((void*)0x20001180, "./file0\000", 8); 113 res = syscall(SYS_open, 0x20001180, 0x8240, 0); 114 if (res != -1) 115 r[0] = res; 116 res = syscall(SYS_socketpair, 1, 1, 0, 0x20000100); 117 if (res != -1) { 118 r[1] = *(uint32_t*)0x20000100; 119 r[2] = *(uint32_t*)0x20000104; 120 } 121 memcpy((void*)0x20000480, "./file0\000", 8); 122 res = syscall(SYS_open, 0x20000480, 0x80000000000206, 0); 123 if (res != -1) 124 r[3] = res; 125 res = syscall(SYS_dup, r[3]); 126 if (res != -1) 127 r[4] = res; 128 *(uint64_t*)0x20000100 = 0x200002c0; 129 memcpy((void*)0x200002c0, "\xdd", 1); 130 *(uint64_t*)0x20000108 = 1; 131 syscall(SYS_pwritev, r[4], 0x20000100, 1, 0); 132 *(uint64_t*)0x20002e80 = 0x20000540; 133 memcpy((void*)0x20000540, "\x7f", 1); 134 *(uint64_t*)0x20002e88 = 1; 135 syscall(SYS_pwritev, r[3], 0x20002e80, 1, 0xbf24); 136 memcpy((void*)0x200004c0, 137 "\x89\x88\xaa\x4a\xc3\x95\x23\x77\x54\xee\x66\xf3\x8d\xa4\xae\xf3\x47" 138 "\x6d\x78\xb7\x1f\xe6\x0d\xb7\x4a\x9f\xb9\xc9\x99\x91\x6c\x98", 139 32); 140 syscall(SYS_setsockopt, r[2], 0, 2, 0x200004c0, 0x20); 141 syscall(SYS_fcntl, r[4], 4, 0x10044); 142 syscall(SYS_read, r[4], 0x20000000, 0x6d999); 143 syscall(SYS_sendfile, r[0], r[1], 0, 2); 144} 145int main(void) 146{ 147 syscall(SYS_mmap, 0x20000000, 0x1000000, 3, 0x1012, -1, 0ul); 148 loop(); 149 return 0; 150} 151EOF 152mycc -o /tmp/syzkaller7 -Wall -Wextra -O2 /tmp/syzkaller7.c -lpthread || 153 exit 1 154 155(cd /tmp; timeout 5m ./syzkaller7) & 156sleep 60 157while pkill -9 syzkaller7; do :; done 158wait 159 160rm -f /tmp/syzkaller7 /tmp/syzkaller7.c /tmp/syzkaller7.core /tmp/file0 161exit 0 162