Index: user/pho/stress2/misc/syzkaller1.sh
===================================================================
--- user/pho/stress2/misc/syzkaller1.sh	(revision 359820)
+++ user/pho/stress2/misc/syzkaller1.sh	(revision 359821)
@@ -1,248 +1,248 @@
 #!/bin/sh
 
 # panic: refcount 0xfffff8001dd678e8 wraparound
 # cpuid = 4
 # time = 1580840365
 # KDB: stack backtrace:
 # db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe00e56517b0
 # vpanic() at vpanic+0x185/frame 0xfffffe00e5651810
 # panic() at panic+0x43/frame 0xfffffe00e5651870
 # _refcount_update_saturated() at _refcount_update_saturated+0x15/frame 0xfffffe00e5651880
 # refcount_release_last() at refcount_release_last+0x7c/frame 0xfffffe00e56518a0
 # closef() at closef+0x1f7/frame 0xfffffe00e5651930
 # fdescfree_fds() at fdescfree_fds+0x3c/frame 0xfffffe00e5651980
 # fdescfree() at fdescfree+0x456/frame 0xfffffe00e5651a40
 # exit1() at exit1+0x4f3/frame 0xfffffe00e5651ab0
 # sys_sys_exit() at sys_sys_exit+0xd/frame 0xfffffe00e5651ac0
 # amd64_syscall() at amd64_syscall+0x2f1/frame 0xfffffe00e5651bf0
 # fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe00e5651bf0
 # --- syscall (1, FreeBSD ELF64, sys_sys_exit), rip = 0x8003d53ba, rsp = 0x7fffffffe9f8, rbp = 0x7fffffffea10 ---
 
 # Fixed by r357554
 
 # $FreeBSD$
 
 . ../default.cfg
 cat > /tmp/syzkaller1.c <<EOF
 
 // https://syzkaller.appspot.com/bug?id=29c002256f2ce0d521d1ce007c74e456a37495a8
 // autogenerated by syzkaller (https://github.com/google/syzkaller)
 
 #define _GNU_SOURCE
 
 #include <errno.h>
 #include <pthread.h>
 #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 <time.h>
 #include <unistd.h>
 
 static void sleep_ms(uint64_t ms)
 {
   usleep(ms * 1000);
 }
 
 static uint64_t current_time_ms(void)
 {
   struct timespec ts;
   if (clock_gettime(CLOCK_MONOTONIC, &ts))
     exit(1);
   return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
 }
 
 static void thread_start(void* (*fn)(void*), void* arg)
 {
   pthread_t th;
   pthread_attr_t attr;
   pthread_attr_init(&attr);
   pthread_attr_setstacksize(&attr, 128 << 10);
   int i;
   for (i = 0; i < 100; i++) {
     if (pthread_create(&th, &attr, fn, arg) == 0) {
       pthread_attr_destroy(&attr);
       return;
     }
     if (errno == EAGAIN) {
       usleep(50);
       continue;
     }
     break;
   }
   exit(1);
 }
 
 typedef struct {
   pthread_mutex_t mu;
   pthread_cond_t cv;
   int state;
 } event_t;
 
 static void event_init(event_t* ev)
 {
   if (pthread_mutex_init(&ev->mu, 0))
     exit(1);
   if (pthread_cond_init(&ev->cv, 0))
     exit(1);
   ev->state = 0;
 }
 
 static void event_reset(event_t* ev)
 {
   ev->state = 0;
 }
 
 static void event_set(event_t* ev)
 {
   pthread_mutex_lock(&ev->mu);
   if (ev->state)
     exit(1);
   ev->state = 1;
   pthread_mutex_unlock(&ev->mu);
   pthread_cond_broadcast(&ev->cv);
 }
 
 static void event_wait(event_t* ev)
 {
   pthread_mutex_lock(&ev->mu);
   while (!ev->state)
     pthread_cond_wait(&ev->cv, &ev->mu);
   pthread_mutex_unlock(&ev->mu);
 }
 
 static int event_isset(event_t* ev)
 {
   pthread_mutex_lock(&ev->mu);
   int res = ev->state;
   pthread_mutex_unlock(&ev->mu);
   return res;
 }
 
 static int event_timedwait(event_t* ev, uint64_t timeout)
 {
   uint64_t start = current_time_ms();
   uint64_t now = start;
   pthread_mutex_lock(&ev->mu);
   for (;;) {
     if (ev->state)
       break;
     uint64_t remain = timeout - (now - start);
     struct timespec ts;
     ts.tv_sec = remain / 1000;
     ts.tv_nsec = (remain % 1000) * 1000 * 1000;
     pthread_cond_timedwait(&ev->cv, &ev->mu, &ts);
     now = current_time_ms();
     if (now - start > timeout)
       break;
   }
   int res = ev->state;
   pthread_mutex_unlock(&ev->mu);
   return res;
 }
 
 struct thread_t {
   int created, call;
   event_t ready, done;
 };
 
 static struct thread_t threads[16];
 static void execute_call(int call);
 static int running;
 
 static void* thr(void* arg)
 {
   struct thread_t* th = (struct thread_t*)arg;
   for (;;) {
     event_wait(&th->ready);
     event_reset(&th->ready);
     execute_call(th->call);
     __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
     event_set(&th->done);
   }
   return 0;
 }
 
 static void loop(void)
 {
   int i, call, thread;
   for (call = 0; call < 7; call++) {
     for (thread = 0; thread < (int)(sizeof(threads) / sizeof(threads[0]));
          thread++) {
       struct thread_t* th = &threads[thread];
       if (!th->created) {
         th->created = 1;
         event_init(&th->ready);
         event_init(&th->done);
         event_set(&th->done);
         thread_start(thr, th);
       }
       if (!event_isset(&th->done))
         continue;
       event_reset(&th->done);
       th->call = call;
       __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
       event_set(&th->ready);
       event_timedwait(&th->done, 45);
       break;
     }
   }
   for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
     sleep_ms(1);
 }
 
 uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff};
 
 void execute_call(int call)
 {
   intptr_t res;
   switch (call) {
   case 0:
     memcpy((void*)0x20000000, "./file0\000", 8);
     res = syscall(SYS_open, 0x20000000ul, 0x40000400000002c2ul, 0ul);
     if (res != -1)
       r[0] = res;
     break;
   case 1:
     res = syscall(SYS_socket, 0x1cul, 1ul, 0ul);
     if (res != -1)
       r[1] = res;
     break;
   case 2:
     syscall(SYS_listen, r[1], 0);
     break;
   case 3:
     syscall(SYS_close, r[0]);
     break;
   case 4:
     syscall(SYS_accept, r[1], 0ul, 0ul);
     break;
   case 5:
     res = syscall(SYS_dup2, r[0], r[1]);
     if (res != -1)
       r[2] = res;
     break;
   case 6:
     syscall(SYS_mmap, 0x20ffd000ul, 0x1000ul, 0ul, 0x10ul, r[2], 0ul);
     break;
   }
 }
 int main(void)
 {
   syscall(SYS_mmap, 0x20000000ul, 0x1000000ul, 3ul, 0x1012ul, -1, 0ul);
   loop();
   return 0;
 }
 EOF
 mycc -o /tmp/syzkaller1 -Wall -Wextra -O2 /tmp/syzkaller1.c -lpthread ||
     exit 1
 
 (cd /tmp; ./syzkaller1)
 
-rm /tmp/syzkaller1 /tmp/syzkaller1.c
+rm -f /tmp/syzkaller1 /tmp/syzkaller1.c /tmp/syzkaller1.core
 exit 0
Index: user/pho/stress2/misc/syzkaller2.sh
===================================================================
--- user/pho/stress2/misc/syzkaller2.sh	(revision 359820)
+++ user/pho/stress2/misc/syzkaller2.sh	(revision 359821)
@@ -1,91 +1,91 @@
 #!/bin/sh
 
 # panic: mutex pcbinfohash not owned at 
 # /syzkaller/managers/main/kernel/sys/netinet6/in6_pcb.c:717
 # cpuid = 0
 # time = 1573247472
 # KDB: stack backtrace:
 # db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 
 # 0xfffffe0022a56260
 # vpanic() at vpanic+0x1c7/frame 0xfffffe0022a562d0
 # panic() at panic+0x43/frame 0xfffffe0022a56330
 # __mtx_assert() at __mtx_assert+0x18b/frame 0xfffffe0022a56370
 # in6_pcblookup_local() at in6_pcblookup_local+0x53/frame 0xfffffe0022a563c0
 # in_pcb_lport() at in_pcb_lport+0x3fd/frame 0xfffffe0022a56450
 # in_pcbbind_setup() at in_pcbbind_setup+0x28b/frame 0xfffffe0022a564f0
 # in_pcbconnect_setup() at in_pcbconnect_setup+0x4aa/frame 0xfffffe0022a565b0
 # udp_send() at udp_send+0xee4/frame 0xfffffe0022a566c0
 # udp6_send() at udp6_send+0x4e8/frame 0xfffffe0022a56870
 # sosend_dgram() at sosend_dgram+0x54f/frame 0xfffffe0022a568e0
 # sosend() at sosend+0xc6/frame 0xfffffe0022a56950
 # kern_sendit() at kern_sendit+0x32d/frame 0xfffffe0022a56a00
 # sendit() at sendit+0x226/frame 0xfffffe0022a56a60
 # sys_sendto() at sys_sendto+0x5c/frame 0xfffffe0022a56ac0
 # amd64_syscall() at amd64_syscall+0x473/frame 0xfffffe0022a56bf0
 # fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe0022a56bf0
 # --- syscall (0, FreeBSD ELF64, nosys), rip = 0x41c3aa, rsp =
 
 # $FreeBSD$
 
 . ../default.cfg
 cat > /tmp/syzkaller2.c <<EOF
 // https://syzkaller.appspot.com/bug?id=062e9fde55f117bec30836a4ef1ef121f51faf23
 // autogenerated by syzkaller (https://github.com/google/syzkaller)
 
 #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>
 
 uint64_t r[1] = {0xffffffffffffffff};
 
 int main(void)
 {
   syscall(SYS_mmap, 0x20000000ul, 0x1000000ul, 3ul, 0x1012ul, -1, 0ul);
   intptr_t res = 0;
   res = syscall(SYS_socket, 0x1cul, 2ul, 0ul);
   if (res != -1)
     r[0] = res;
   *(uint32_t*)0x200001c0 = 0;
   syscall(SYS_setsockopt, r[0], 0x29ul, 0x1bul, 0x200001c0ul, 4ul);
   *(uint8_t*)0x20000100 = 0x1c;
   *(uint8_t*)0x20000101 = 0x1c;
   *(uint16_t*)0x20000102 = htobe16(0x4e21);
   *(uint32_t*)0x20000104 = 0;
   *(uint8_t*)0x20000108 = 0;
   *(uint8_t*)0x20000109 = 0;
   *(uint8_t*)0x2000010a = 0;
   *(uint8_t*)0x2000010b = 0;
   *(uint8_t*)0x2000010c = 0;
   *(uint8_t*)0x2000010d = 0;
   *(uint8_t*)0x2000010e = 0;
   *(uint8_t*)0x2000010f = 0;
   *(uint8_t*)0x20000110 = 0;
   *(uint8_t*)0x20000111 = 0;
   *(uint8_t*)0x20000112 = -1;
   *(uint8_t*)0x20000113 = -1;
   *(uint8_t*)0x20000114 = 0xac;
   *(uint8_t*)0x20000115 = 0x14;
   *(uint8_t*)0x20000116 = 0;
   *(uint8_t*)0x20000117 = 0xaa;
   *(uint32_t*)0x20000118 = 0;
   syscall(SYS_sendto, r[0], 0ul, 0ul, 0ul, 0x20000100ul, 0x1cul);
   return 0;
 }
 EOF
 mycc -o /tmp/syzkaller2 -Wall -Wextra -O2 /tmp/syzkaller2.c ||
     exit 1
 rm /tmp/syzkaller2.c
 
 (cd /tmp; ./syzkaller2)
 
-rm /tmp/syzkaller2
+rm -f /tmp/syzkaller2 /tmp/syzkaller2.core
 exit 0