1#!/bin/sh 2 3# panic: uma_zalloc_debug: called within spinlock or critical section 4# cpuid = 9 5# time = 1606151277 6# KDB: stack backtrace: 7# db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe0101c628a0 8# vpanic() at vpanic+0x181/frame 0xfffffe0101c628f0 9# panic() at panic+0x43/frame 0xfffffe0101c62950 10# uma_zalloc_arg() at uma_zalloc_arg+0x1e6/frame 0xfffffe0101c62990 11# cpuset_modify_domain() at cpuset_modify_domain+0x1bf/frame 0xfffffe0101c62a10 12# kern_cpuset_setdomain() at kern_cpuset_setdomain+0x402/frame 0xfffffe0101c62aa0 13# sys_cpuset_setdomain() at sys_cpuset_setdomain+0x26/frame 0xfffffe0101c62ac0 14# amd64_syscall() at amd64_syscall+0x147/frame 0xfffffe0101c62bf0 15# fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe0101c62bf0 16# --- syscall (0, FreeBSD ELF64, nosys), rip = 0x800380d4a, rsp = 0x7fffffffe4b8, rbp = 0x7fffffffe4f0 --- 17# KDB: enter: panic 18# [ thread pid 81187 tid 100369 ] 19# Stopped at kdb_enter+0x37: movq $0,0x10b3236(%rip) 20# db> x/s version 21# version: FreeBSD 13.0-CURRENT #0 r367945: Mon Nov 23 09:10:40 CET 2020 22# pho@t2.osted.lan:/usr/src/sys/amd64/compile/PHO 23# db> 24 25[ `uname -p` != "amd64" ] && exit 0 26 27# Fixed by r368116 28 29. ../default.cfg 30cat > /tmp/syzkaller29.c <<EOF 31// https://syzkaller.appspot.com/bug?id=c3452066dba9238c4551010eb130944442d9174f 32// autogenerated by syzkaller (https://github.com/google/syzkaller) 33// Reported-by: syzbot+6743fa07b9b7528dc561@syzkaller.appspotmail.com 34 35#define _GNU_SOURCE 36 37#include <sys/types.h> 38 39#include <pwd.h> 40#include <signal.h> 41#include <stdarg.h> 42#include <stdbool.h> 43#include <stdint.h> 44#include <stdio.h> 45#include <stdlib.h> 46#include <string.h> 47#include <sys/endian.h> 48#include <sys/syscall.h> 49#include <sys/wait.h> 50#include <time.h> 51#include <unistd.h> 52 53static void kill_and_wait(int pid, int* status) 54{ 55 kill(pid, SIGKILL); 56 while (waitpid(-1, status, 0) != pid) { 57 } 58} 59 60static void sleep_ms(uint64_t ms) 61{ 62 usleep(ms * 1000); 63} 64 65static uint64_t current_time_ms(void) 66{ 67 struct timespec ts; 68 if (clock_gettime(CLOCK_MONOTONIC, &ts)) 69 exit(1); 70 return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000; 71} 72 73static void execute_one(void); 74 75#define WAIT_FLAGS 0 76 77static void loop(void) 78{ 79 int iter = 0; 80 for (;; iter++) { 81 int pid = fork(); 82 if (pid < 0) 83 exit(1); 84 if (pid == 0) { 85 execute_one(); 86 exit(0); 87 } 88 int status = 0; 89 uint64_t start = current_time_ms(); 90 for (;;) { 91 if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid) 92 break; 93 sleep_ms(1); 94 if (current_time_ms() - start < 5 * 1000) 95 continue; 96 kill_and_wait(pid, &status); 97 break; 98 } 99 } 100} 101 102void execute_one(void) 103{ 104 *(uint64_t*)0x20000240 = 1; 105 *(uint64_t*)0x20000248 = 0; 106 *(uint64_t*)0x20000250 = 0; 107 *(uint64_t*)0x20000258 = 0; 108 syscall(SYS_cpuset_setdomain, 2ul, 2ul, 0ul, 0x20ul, 0x20000240ul, 4ul); 109 *(uint64_t*)0x20000240 = 1; 110 *(uint64_t*)0x20000248 = 0; 111 *(uint64_t*)0x20000250 = 0; 112 *(uint64_t*)0x20000258 = 0; 113 syscall(SYS_cpuset_setdomain, 3ul, 2ul, 0ul, 0x20ul, 0x20000240ul, 1ul); 114} 115int main(void) 116{ 117 syscall(SYS_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x1012ul, -1, 0ul); 118 loop(); 119 return 0; 120} 121EOF 122mycc -o /tmp/syzkaller29 -Wall -Wextra -O0 /tmp/syzkaller29.c || 123 exit 1 124 125(cd /tmp; timeout 3m ./syzkaller29) 126 127rm -rf /tmp/syzkaller29 syzkaller29.c /tmp/syzkaller.* 128exit 0 129