1#!/bin/sh 2 3# panic: _pctrie_lookup_node: freed node in iter path 4# cpuid = 0 5# time = 1745029155 6# KDB: stack backtrace: 7# db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe01085d2a30 8# vpanic() at vpanic+0x136/frame 0xfffffe01085d2b60 9# panic() at panic+0x43/frame 0xfffffe01085d2bc0 10# pctrie_iter_lookup_ge() at pctrie_iter_lookup_ge+0x166/frame 0xfffffe01085d2bd0 11# vm_object_page_clean() at vm_object_page_clean+0x22e/frame 0xfffffe01085d2c50 12# vnode_pager_clean_async() at vnode_pager_clean_async+0x48/frame 0xfffffe01085d2c70 13# vinactivef() at vinactivef+0x75/frame 0xfffffe01085d2cb0 14# vput_final() at vput_final+0x29c/frame 0xfffffe01085d2d00 15# vm_map_process_deferred() at vm_map_process_deferred+0xa9/frame 0xfffffe01085d2d20 16# vm_map_remove() at vm_map_remove+0xcb/frame 0xfffffe01085d2d50 17# vmspace_exit() at vmspace_exit+0xa8/frame 0xfffffe01085d2d80 18# exit1() at exit1+0x533/frame 0xfffffe01085d2df0 19# sys_exit() at sys_exit+0xd/frame 0xfffffe01085d2e00 20# amd64_syscall() at amd64_syscall+0x15a/frame 0xfffffe01085d2f30 21# fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe01085d2f30 22# --- syscall (1, FreeBSD ELF64, exit), rip = 0x822a9b7fa, rsp = 0x8202b4de8, rbp = 0x8202b4e00 --- 23# KDB: enter: panic 24# [ thread pid 21141 tid 100328 ] 25# Stopped at kdb_enter+0x33: movq $0,0x104d862(%rip) 26# db> 27 28[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1 29 30. ../default.cfg 31set -u 32prog=$(basename "$0" .sh) 33cat > /tmp/$prog.c <<EOF 34// https://syzkaller.appspot.com/bug?id=8658267170f7f61f4317bb04c1fe9add379ffaf4 35// autogenerated by syzkaller (https://github.com/google/syzkaller) 36// syzbot+b5f9ebf4c2c63a5db681@syzkaller.appspotmail.com 37 38#define _GNU_SOURCE 39 40#include <sys/types.h> 41 42#include <dirent.h> 43#include <errno.h> 44#include <pthread.h> 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/resource.h> 55#include <sys/stat.h> 56#include <sys/syscall.h> 57#include <sys/wait.h> 58#include <time.h> 59#include <unistd.h> 60 61static void kill_and_wait(int pid, int* status) 62{ 63 kill(pid, SIGKILL); 64 while (waitpid(-1, status, 0) != pid) { 65 } 66} 67 68static void sleep_ms(uint64_t ms) 69{ 70 usleep(ms * 1000); 71} 72 73static uint64_t current_time_ms(void) 74{ 75 struct timespec ts; 76 if (clock_gettime(CLOCK_MONOTONIC, &ts)) 77 exit(1); 78 return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000; 79} 80 81static void use_temporary_dir(void) 82{ 83 char tmpdir_template[] = "./syzkaller.XXXXXX"; 84 char* tmpdir = mkdtemp(tmpdir_template); 85 if (!tmpdir) 86 exit(1); 87 if (chmod(tmpdir, 0777)) 88 exit(1); 89 if (chdir(tmpdir)) 90 exit(1); 91} 92 93static void reset_flags(const char* filename) 94{ 95 struct stat st; 96 if (lstat(filename, &st)) 97 exit(1); 98 st.st_flags &= ~(SF_NOUNLINK | UF_NOUNLINK | SF_IMMUTABLE | UF_IMMUTABLE | 99 SF_APPEND | UF_APPEND); 100 if (lchflags(filename, st.st_flags)) 101 exit(1); 102} 103static void __attribute__((noinline)) remove_dir(const char* dir) 104{ 105 DIR* dp = opendir(dir); 106 if (dp == NULL) { 107 if (errno == EACCES) { 108 if (rmdir(dir)) 109 exit(1); 110 return; 111 } 112 exit(1); 113 } 114 struct dirent* ep = 0; 115 while ((ep = readdir(dp))) { 116 if (strcmp(ep->d_name, ".") == 0 || strcmp(ep->d_name, "..") == 0) 117 continue; 118 char filename[FILENAME_MAX]; 119 snprintf(filename, sizeof(filename), "%s/%s", dir, ep->d_name); 120 struct stat st; 121 if (lstat(filename, &st)) 122 exit(1); 123 if (S_ISDIR(st.st_mode)) { 124 remove_dir(filename); 125 continue; 126 } 127 if (unlink(filename)) { 128 if (errno == EPERM) { 129 reset_flags(filename); 130 reset_flags(dir); 131 if (unlink(filename) == 0) 132 continue; 133 } 134 exit(1); 135 } 136 } 137 closedir(dp); 138 while (rmdir(dir)) { 139 if (errno == EPERM) { 140 reset_flags(dir); 141 if (rmdir(dir) == 0) 142 break; 143 } 144 exit(1); 145 } 146} 147 148static void thread_start(void* (*fn)(void*), void* arg) 149{ 150 pthread_t th; 151 pthread_attr_t attr; 152 pthread_attr_init(&attr); 153 pthread_attr_setstacksize(&attr, 128 << 10); 154 int i = 0; 155 for (; i < 100; i++) { 156 if (pthread_create(&th, &attr, fn, arg) == 0) { 157 pthread_attr_destroy(&attr); 158 return; 159 } 160 if (errno == EAGAIN) { 161 usleep(50); 162 continue; 163 } 164 break; 165 } 166 exit(1); 167} 168 169typedef struct { 170 pthread_mutex_t mu; 171 pthread_cond_t cv; 172 int state; 173} event_t; 174 175static void event_init(event_t* ev) 176{ 177 if (pthread_mutex_init(&ev->mu, 0)) 178 exit(1); 179 if (pthread_cond_init(&ev->cv, 0)) 180 exit(1); 181 ev->state = 0; 182} 183 184static void event_reset(event_t* ev) 185{ 186 ev->state = 0; 187} 188 189static void event_set(event_t* ev) 190{ 191 pthread_mutex_lock(&ev->mu); 192 if (ev->state) 193 exit(1); 194 ev->state = 1; 195 pthread_mutex_unlock(&ev->mu); 196 pthread_cond_broadcast(&ev->cv); 197} 198 199static void event_wait(event_t* ev) 200{ 201 pthread_mutex_lock(&ev->mu); 202 while (!ev->state) 203 pthread_cond_wait(&ev->cv, &ev->mu); 204 pthread_mutex_unlock(&ev->mu); 205} 206 207static int event_isset(event_t* ev) 208{ 209 pthread_mutex_lock(&ev->mu); 210 int res = ev->state; 211 pthread_mutex_unlock(&ev->mu); 212 return res; 213} 214 215static int event_timedwait(event_t* ev, uint64_t timeout) 216{ 217 uint64_t start = current_time_ms(); 218 uint64_t now = start; 219 pthread_mutex_lock(&ev->mu); 220 for (;;) { 221 if (ev->state) 222 break; 223 uint64_t remain = timeout - (now - start); 224 struct timespec ts; 225 ts.tv_sec = remain / 1000; 226 ts.tv_nsec = (remain % 1000) * 1000 * 1000; 227 pthread_cond_timedwait(&ev->cv, &ev->mu, &ts); 228 now = current_time_ms(); 229 if (now - start > timeout) 230 break; 231 } 232 int res = ev->state; 233 pthread_mutex_unlock(&ev->mu); 234 return res; 235} 236 237static void sandbox_common() 238{ 239 struct rlimit rlim; 240 rlim.rlim_cur = rlim.rlim_max = 128 << 20; 241 setrlimit(RLIMIT_AS, &rlim); 242 rlim.rlim_cur = rlim.rlim_max = 8 << 20; 243 setrlimit(RLIMIT_MEMLOCK, &rlim); 244 rlim.rlim_cur = rlim.rlim_max = 1 << 20; 245 setrlimit(RLIMIT_FSIZE, &rlim); 246 rlim.rlim_cur = rlim.rlim_max = 1 << 20; 247 setrlimit(RLIMIT_STACK, &rlim); 248 rlim.rlim_cur = rlim.rlim_max = 0; 249 setrlimit(RLIMIT_CORE, &rlim); 250 rlim.rlim_cur = rlim.rlim_max = 256; 251 setrlimit(RLIMIT_NOFILE, &rlim); 252} 253 254static void loop(); 255 256static int do_sandbox_none(void) 257{ 258 sandbox_common(); 259 loop(); 260 return 0; 261} 262 263struct thread_t { 264 int created, call; 265 event_t ready, done; 266}; 267 268static struct thread_t threads[16]; 269static void execute_call(int call); 270static int running; 271 272static void* thr(void* arg) 273{ 274 struct thread_t* th = (struct thread_t*)arg; 275 for (;;) { 276 event_wait(&th->ready); 277 event_reset(&th->ready); 278 execute_call(th->call); 279 __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED); 280 event_set(&th->done); 281 } 282 return 0; 283} 284 285static void execute_one(void) 286{ 287 if (write(1, "executing program\n", sizeof("executing program\n") - 1)) { 288 } 289 int i, call, thread; 290 for (call = 0; call < 12; call++) { 291 for (thread = 0; thread < (int)(sizeof(threads) / sizeof(threads[0])); 292 thread++) { 293 struct thread_t* th = &threads[thread]; 294 if (!th->created) { 295 th->created = 1; 296 event_init(&th->ready); 297 event_init(&th->done); 298 event_set(&th->done); 299 thread_start(thr, th); 300 } 301 if (!event_isset(&th->done)) 302 continue; 303 event_reset(&th->done); 304 th->call = call; 305 __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED); 306 event_set(&th->ready); 307 event_timedwait(&th->done, 50); 308 break; 309 } 310 } 311 for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++) 312 sleep_ms(1); 313} 314 315static void execute_one(void); 316 317#define WAIT_FLAGS 0 318 319static void loop(void) 320{ 321 int iter = 0; 322 for (;; iter++) { 323 char cwdbuf[32]; 324 sprintf(cwdbuf, "./%d", iter); 325 if (mkdir(cwdbuf, 0777)) 326 exit(1); 327 int pid = fork(); 328 if (pid < 0) 329 exit(1); 330 if (pid == 0) { 331 if (chdir(cwdbuf)) 332 exit(1); 333 execute_one(); 334 exit(0); 335 } 336 int status = 0; 337 uint64_t start = current_time_ms(); 338 for (;;) { 339 sleep_ms(10); 340 if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid) 341 break; 342 if (current_time_ms() - start < 5000) 343 continue; 344 kill_and_wait(pid, &status); 345 break; 346 } 347 remove_dir(cwdbuf); 348 } 349} 350 351uint64_t r[5] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 352 0xffffffffffffffff, 0xffffffffffffffff}; 353 354void execute_call(int call) 355{ 356 intptr_t res = 0; 357 switch (call) { 358 case 0: 359 memcpy((void*)0x200000000000, "./file0\000", 8); 360 res = syscall(SYS_openat, /*fd=*/0xffffff9c, /*file=*/0x200000000000ul, 361 /*flags=O_VERIFY|O_CREAT|O_WRONLY*/ 0x200201ul, /*mode=*/0ul); 362 if (res != -1) 363 r[0] = res; 364 break; 365 case 1: 366 *(uint32_t*)0x200000000240 = r[0]; 367 *(uint64_t*)0x200000000248 = 0x80000001; 368 *(uint64_t*)0x200000000250 = 0x2000000004c0; 369 memcpy((void*)0x2000000004c0, "\x45\x09\xee\x8f\xcd", 5); 370 *(uint64_t*)0x200000000258 = 5; 371 *(uint32_t*)0x200000000260 = 3; 372 *(uint32_t*)0x200000000264 = 0; 373 *(uint64_t*)0x200000000268 = 0x200000000000000; 374 *(uint32_t*)0x200000000270 = 8; 375 *(uint32_t*)0x200000000274 = 0; 376 *(uint64_t*)0x200000000278 = 1; 377 *(uint64_t*)0x200000000280 = 7; 378 *(uint64_t*)0x200000000288 = 0; 379 *(uint32_t*)0x200000000290 = 0; 380 *(uint32_t*)0x200000000294 = 0x20000005; 381 *(uint32_t*)0x200000000298 = 0x2e5562f1; 382 *(uint16_t*)0x2000000002a0 = 0xc088; 383 syscall(SYS_aio_write, /*iocb=*/0x200000000240ul); 384 break; 385 case 2: 386 memcpy((void*)0x200000000480, "./file0\000", 8); 387 res = syscall(SYS_open, /*file=*/0x200000000480ul, 388 /*flags=O_VERIFY*/ 0x200000ul, 389 /*mode=S_IWOTH|S_IWGRP|S_IXUSR|S_IWUSR*/ 0xd2ul); 390 if (res != -1) 391 r[1] = res; 392 break; 393 case 3: 394 syscall(SYS_mmap, /*addr=*/0x200000000000ul, /*len=*/0x200000ul, 395 /*prot=PROT_WRITE|PROT_READ*/ 3ul, 396 /*flags=MAP_FIXED|MAP_PRIVATE*/ 0x12ul, /*fd=*/r[1], 397 /*offset=*/0ul); 398 break; 399 case 4: 400 memcpy((void*)0x200000000100, "./file0\000", 8); 401 res = syscall(SYS_open, /*file=*/0x200000000100ul, 402 /*flags=O_DIRECT*/ 0x10000ul, /*mode=*/0ul); 403 if (res != -1) 404 r[2] = res; 405 break; 406 case 5: 407 memcpy((void*)0x2000000016c0, "./file0\000", 8); 408 res = syscall(SYS_open, /*file=*/0x2000000016c0ul, /*flags=O_WRONLY*/ 1ul, 409 /*mode=*/0ul); 410 if (res != -1) 411 r[3] = res; 412 break; 413 case 6: 414 *(uint64_t*)0x200000000080 = 0x2000000006c0; 415 *(uint64_t*)0x200000000088 = 0x100000; 416 syscall(SYS_pwritev, /*fd=*/r[3], /*vec=*/0x200000000080ul, /*vlen=*/1ul, 417 /*off=*/0ul); 418 break; 419 case 7: 420 *(uint64_t*)0x200000001780 = 0x200000000180; 421 *(uint64_t*)0x200000001788 = 0x1b133353141e377d; 422 syscall(SYS_preadv, /*fd=*/r[2], /*vec=*/0x200000001780ul, 423 /*vlen=*/0x10000000000000d1ul, /*off=*/0ul); 424 break; 425 case 8: 426 memcpy((void*)0x200000000480, "./file0\000", 8); 427 res = syscall( 428 SYS_open, /*file=*/0x200000000480ul, 429 /*flags=O_NONBLOCK|O_CREAT|O_RDWR|0x80400000000000*/ 0x80400000000206ul, 430 /*mode=*/0ul); 431 if (res != -1) 432 r[4] = res; 433 break; 434 case 9: 435 syscall(SYS_mmap, /*addr=*/0x200000000000ul, /*len=*/0x200000ul, 436 /*prot=PROT_WRITE|PROT_READ*/ 3ul, 437 /*flags=MAP_FIXED|MAP_SHARED|0x20000*/ 0x20011ul, /*fd=*/r[4], 438 /*offset=*/0ul); 439 break; 440 case 10: 441 syscall(SYS_setsockopt, /*fd=*/(intptr_t)-1, /*level=*/6, 442 /*optname=TCP_LOGID*/ 0x24, /*optval=*/0ul, /*optlen=*/0ul); 443 break; 444 case 11: 445 syscall(SYS_setsockopt, /*fd=*/(intptr_t)-1, /*level=*/6, 446 /*optname=TCP_LOGID*/ 0x24, /*optval=*/0ul, /*optlen=*/0ul); 447 break; 448 } 449} 450int main(void) 451{ 452 syscall(SYS_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000ul, 453 /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul, 454 /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x1012ul, 455 /*fd=*/(intptr_t)-1, /*offset=*/0ul); 456 const char* reason; 457 (void)reason; 458 use_temporary_dir(); 459 do_sandbox_none(); 460 return 0; 461} 462EOF 463mycc -o /tmp/$prog -Wall -Wextra -O0 /tmp/$prog.c -lpthread || exit 1 464 465cd /tmp 466timeout 3m /tmp/$prog > /dev/null 2>&1 467 468rm -rf /tmp/$prog /tmp/$prog.c /tmp/$prog.core /tmp/$prog.?????? 469exit 0 470