#!/bin/sh # Fatal trap 12: page fault while in kernel mode # cpuid = 1; apic id = 01 # fault virtual address = 0x20 # fault code = supervisor read data, page not present # instruction pointer = 0x20:0xfa1a2c # stack pointer = 0x28:0x27a41a80 # frame pointer = 0x28:0x27a41a98 # code segment = base 0x0, limit 0xfffff, type 0x1b # = DPL 0, pres 1, def32 1, gran 1 # processor eflags = interrupt enabled, resume, IOPL = 0 # current process = 804 (syzkaller63) # trap number = 12 # panic: page fault # cpuid = 1 # time = 1675071979 # KDB: stack backtrace: # db_trace_self_wrapper(d,2048e3a0,27a41a40,20,c,...) at db_trace_self_wrapper+0x28/frame 0x27a418d0 # vpanic(146c355,27a4190c,27a4190c,27a41938,141f1d6,...) at vpanic+0xf4/frame 0x27a418ec # panic(146c355,15010e8,0,fffff,1dfc39b,...) at panic+0x14/frame 0x27a41900 # trap_fatal(2048e3a0,2048e3a0,27a4196c,1008e0a,18cd6638,...) at trap_fatal+0x346/frame 0x27a41938 # trap_pfault(20,0,0) at trap_pfault+0x6f/frame 0x27a4196c # trap(27a41a40,8,28,28,0,...) at trap+0x31b/frame 0x27a41a34 # calltrap() at 0xffc0321f/frame 0x27a41a34 # --- trap 0xc, eip = 0xfa1a2c, esp = 0x27a41a80, ebp = 0x27a41a98 --- # kern_cpuset_getid(141f60e,0,9,0,0,0) at kern_cpuset_getid+0x10c/frame 0x27a41a98 # sys_cpuset_getid(2048e3a0,2048e644,2048e3a0,2048e3a0,27a41b9c,...) at sys_cpuset_getid+0x32/frame 0x27a41ac0 # syscall(27a41ba8,3b,3b,3b,ffbfe9fc,...) at syscall+0x1ef/frame 0x27a41b9c # Xint0x80_syscall() at 0xffc03479/frame 0x27a41b9c # --- syscall (486, FreeBSD ELF32, cpuset_getid), eip = 0x2056317d, esp = 0xffbfe990, ebp = 0xffbfe9b0 --- # KDB: enter: panic # [ thread pid 804 tid 100092 ] # Stopped at kdb_enter+0x34: movl $0,kdb_why # db> x/s version # version: FreeBSD 14.0-CURRENT #0 main-n260354-34b867ca30479: Mon Jan 30 07:26:30 CET 2023 # pho@mercat1.netperf.freebsd.org:/mnt25/obj/usr/src/i386.i386/sys/PHO # db> . ../default.cfg prog=$(basename "$0" .sh) [ `uname -p` = "i386" ] || exit 0 cat > /tmp/$prog.c <<EOF // https://syzkaller.appspot.com/bug?id=69dd3c8d867306dd9f97e2dae6ab1557fd8d2679 // autogenerated by syzkaller (https://github.com/google/syzkaller) // Reported-by: syzbot+331e8402e0f7347f0f2a@syzkaller.appspotmail.com #define _GNU_SOURCE #include <pwd.h> #include <stdarg.h> #include <stdbool.h> #include <stdint.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/endian.h> #include <sys/syscall.h> #include <unistd.h> int main(void) { syscall(SYS_mmap, 0x10000000, 0x1000000, 7, 0x1012, -1, 0); syscall(SYS_cpuset_getid, 0, 9, 0ull, 0); return 0; } EOF mycc -o /tmp/$prog -Wall -Wextra -O0 /tmp/$prog.c || exit 1 (cd /tmp; timeout -k 3s 2s ./$prog) rm -rf /tmp/$prog /tmp/$prog.c /tmp/$prog.core \ /tmp/syzkaller.?????? exit 0