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</o:shapelayout></xml><![endif]--></head><body lang=ZH-CN link=blue vlink=purple style='text-justify-trim:punctuation'><div class=WordSection1><p class=MsoNormal align=left style='text-align:left;line-height:13.5pt;background:#FAFAFA'><span lang=EN-US style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:#222222'>Hi,<o:p></o:p></span></p><p class=MsoNormal align=left style='text-align:left;line-height:13.5pt;background:#FAFAFA'><span lang=EN-US style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:#222222'>I am using armv7 for openwrt development and facing a segfault caused by vfork.<br>I have wrote a small test program with the following segments:<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'> ...<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'> pid_t child_t;<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'> if((child_t = vfork()) < 0)<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'> {<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'> printf("error!\n");<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'> return -1;<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'> }<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'> else if(child_t == 0)<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'> {<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'> printf("in child:pid =%d\n",getpid());<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'> sleep(2);<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'> _exit(0);<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'> }<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'> else<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'> {<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'> printf("in parent:child_t id = %d,pid = %d\n",child_t,getpid());<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'> }<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'> ...</span><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'><o:p></o:p></span></p><p class=MsoNormal align=left style='text-align:left;line-height:13.5pt;background:#FAFAFA'><span lang=EN-US style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:#222222'>The vfork() function always cause segfault, this is the gdb debug trace:<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:#222222'>...<br> (gdb) c<br> Breakpoint 1, main (argc=1, argv=0xbefffed4) at handler.c:33<br> 33 if((child_t = vfork()) < 0)<br> (gdb) stepi</span><span lang=EN-US style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:#222222'> </span><span lang=EN-US style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:#222222'><br> 0x00008474 in vfork () at libpthread/nptl/sysdeps/unix/sysv/linux/arm/../../../../../../../libc/sysdeps/linux/arm/vfork.S:71<br> 71 SAVE_PID<br> (gdb) l<br> 66 </span><span lang=EN-US style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:#222222'> </span><span lang=EN-US style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:#222222'><br> 67 #else<br> 68 __vfork:<br> 69 </span><span lang=EN-US style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:#222222'> </span><span lang=EN-US style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:#222222'><br> 70 #ifdef __NR_vfork<br> 71 SAVE_PID<br> 72 DO_CALL (vfork)<br> 73 RESTORE_PID<br> 74 cmn r0, #4096<br> 75 IT(t, cc)<br> (gdb) b libpthread/nptl/sysdeps/unix/sysv/linux/arm/../../../../../../../libc/sysdeps/linux/arm/vfork.S:72<br> Breakpoint 2 at 0xb6fcf930: file libpthread/nptl/sysdeps/unix/sysv/linux/arm/../../../../../../../libc/sysdeps/linux/arm/vfork.S, line 72.<br> (gdb) disassemble<br> 0x00008584 <+40>: bl 0x8444 <puts><br> => 0x00008588 <+44>: bl 0x8474 <vfork><br> 0x0000858c <+48>: str r0, [r11, #-12]<br> (gdb)stepi<br> ...<br> (gdb) stepi</span><span lang=EN-US style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:#222222'> </span><span lang=EN-US style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:#222222'><br> 0x00008474 in vfork () at libpthread/nptl/sysdeps/unix/sysv/linux/arm/../../../../../../../libc/sysdeps/linux/arm/vfork.S:71<br> 71 SAVE_PID<br> (gdb) disassemble</span><span lang=EN-US style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:#222222'> </span><span lang=EN-US style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:#222222'><br> Dump of assembler code for function vfork:<br> => 0x00008474 <+0>: add r12, pc, #0, 12<br> 0x00008478 <+4>: add r12, r12, #8, 20 ; 0x8000<br> 0x0000847c <+8>: ldr pc, [r12, #796]! ; 0x31c<br> (gdb) stepi<br> …<br> (gdb) disassemble<br> Dump of assembler code for function vfork:<br> 0x00008474 <+0>: add r12, pc, #0, 12<br> 0x00008478 <+4>: add r12, r12, #8, 20 ; 0x8000<br> => 0x0000847c <+8>: ldr pc, [r12, #796]! ; 0x31c<br> (gdb)c<br> Continuing.<br> Program received signal SIGSEGV, Segmentation fault.<br> 0xffff0fe0 in ?? ()<br> (gdb)<o:p></o:p></span></p><p class=MsoNormal align=left style='text-align:left;line-height:13.5pt;background:#FAFAFA'><span lang=EN-US style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:#222222'>I have also found the vfork code at vfork.S:<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'>__vfork:<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'><o:p> </o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'>#ifdef __NR_vfork<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'> SAVE_PID<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'> DO_CALL (vfork)<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'> RESTORE_PID<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'> cmn r0, #4096<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'> IT(t, cc)<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'>#if defined(__USE_BX__)<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'> bxcc lr<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'>#else<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'> movcc pc, lr<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'>#endif<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'><o:p> </o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'> /* Check if vfork even exists. */<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'> ldr r1, =-ENOSYS<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'> teq r0, r1<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'> bne __error<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'>#endif<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'><o:p> </o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'> /* If we don't have vfork, use fork. */<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'> DO_CALL (fork)<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'> cmn r0, #4096<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'><o:p> </o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'> /* Syscall worked. Return to child/parent */<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'> IT(t, cc)<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'>#if defined(__USE_BX__)<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'> bxcc lr<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'>#else<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'> movcc pc, lr<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'>#endif<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'><o:p> </o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'>__error:<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'> b __syscall_error<o:p></o:p></span></p><p class=MsoNormal align=left style='mso-margin-top-alt:0cm;margin-right:12.0pt;margin-bottom:0cm;margin-left:12.0pt;margin-bottom:.0001pt;text-align:left;line-height:13.5pt;background:white'><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'>#endif</span><span lang=EN-US style='font-size:9.0pt;font-family:"Courier New";color:#222222'><o:p></o:p></span></p><p class=MsoNormal align=left style='text-align:left'><span lang=EN-US style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:#222222'><br><br></span><span lang=EN-US style='font-size:12.0pt;font-family:宋体'><o:p></o:p></span></p><p class=MsoNormal align=left style='text-align:left;line-height:13.5pt;background:#FAFAFA'><span lang=EN-US style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:#222222'>It just seems that SAVE_PID instruction cause some problem.<br>Could anyone help?<o:p></o:p></span></p><p class=MsoNormal align=left style='text-align:left;line-height:13.5pt;background:#FAFAFA'><span lang=EN-US style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:#222222'><o:p> </o:p></span></p><p class=MsoNormal align=left style='text-align:left;line-height:13.5pt;background:#FAFAFA'><span lang=EN-US style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:#222222'>Thanks,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Qi<o:p></o:p></span></p></div></body></html>