Re: [LTP] [PATCH] Crash02: Deal with SIGSTOP and SIGSEGV

[Subrata M. <su...@li...>]

On Thu, 2009-05-21 at 22:20 +0800, CAI Qian wrote: 
> Please don't apply this patch, which will cause compilation failure on
> IA-64. I'll re-sent it shortly.
> 

OK.

> CAI Qian
> 
> From: CAI Qian <ca...@cc...>
> Subject: [LTP] [PATCH] Crash02: Deal with SIGSTOP and SIGSEGV
> Date: Tue, 19 May 2009 20:14:43 +0800 (CST)
> 
> > Hi,
> > 
> > We have seen crash02 test can not finish due to the child process got
> > SIGSTOP or SIGSEGV when calling random syscalls like this,
> > 
> > # ps aux
> > ...
> > 168      20121  0.0  0.0   3956   336 ?        Ds   15:10   0:00 ./crash02 -e -v 100
> > 168      20122  0.0  0.0   3956   336 ?        T    15:10   0:00 ./crash02 -e -v 100
> > 
> > 
> > crash02       X ffff81007fb127a0     0 21272  21271         21273       (L-TLB)
> >  ffff81004c185d58 0000000000000046 ffff81007b494e08 0000000000000002
> >  0000000000000002 0000000000000002 ffff81007c5dc860 ffff81007fb127a0
> >  00000d8ebb800862 000000000000c315 ffff81007c5dca48 0000000300000001
> > Call Trace:
> >  [<ffffffff800235a7>] filp_close+0x5c/0x64
> >  [<ffffffff8001595a>] do_exit+0x913/0x91f
> >  [<ffffffff80048c18>] cpuset_exit+0x0/0x6c
> >  [<ffffffff8002ad05>] get_signal_to_deliver+0x42c/0x45a
> >  [<ffffffff8005a837>] do_notify_resume+0x9c/0x7af
> >  [<ffffffff80096e2b>] specific_send_sig_info+0x44/0xac
> >  [<ffffffff8009710e>] force_sig_info+0xae/0xb9
> >  [<ffffffff80066eed>] do_page_fault+0x81e/0x830
> >  [<ffffffff8005d6dc>] retint_signal+0x3d/0x79
> > 
> > crash02       X ffff810002376400     0 21273  21271               21272 (L-TLB)
> >  ffff81004d201f18 0000000000000046 ffff81007b494e08 0000000000000046
> >  0000000000000046 0000000000000002 ffff810078d3a040 ffffffff802eeae0
> >  00000d8ebb803430 000000000001a60c ffff810078d3a228 0000000000000000
> > Call Trace:
> >  [<ffffffff8001595a>] do_exit+0x913/0x91f
> >  [<ffffffff80048c18>] cpuset_exit+0x0/0x6c
> >  [<ffffffff8005d28d>] tracesys+0xd5/0xe0
> > 
> > So we use WUNTRACED option. Also, we found out that it picks up vfork(),
> > it will generate SIGSEGV. I am not sure what else can generate the same,
> > so only blacklist vfork() at the moment.
> > 
> > Signed-off-by: CAI Qian <ca...@cc...>
> > 
> > --- testcases/misc/crash/crash02.c.orig	2009-05-19 19:47:24.000000000 +0800
> > +++ testcases/misc/crash/crash02.c	2009-05-19 20:03:51.000000000 +0800
> > @@ -51,6 +51,8 @@
> >  */
> >  
> >  
> > +#define _GNU_SOURCE
> > +#include <sys/syscall.h>
> >  #include <stdio.h>
> >  #include <stdlib.h>
> >  #include <string.h>
> > @@ -241,7 +243,7 @@
> >        my_signal (SIGALRM, monitor_fcn);
> >        alarm (ntries*MAX_TRY_TIME);
> >  
> > -	  pid = wait (&status);
> > +	  pid = waitpid (-1, &status, WUNTRACED);
> >  	  if (pid <= 0)
> >  	  {
> >  		  perror ("wait");
> > @@ -453,7 +455,10 @@
> >  {
> >    long int sysno, arg1, arg2, arg3, arg4, arg5, arg6, arg7;
> >  
> > -  sysno = rand()%sysno_max;
> > +  do {
> > +    sysno = rand()%sysno_max;
> > +  } while (sysno == SYS_vfork);
> > +
> >    arg1 = rand_long();
> >    arg2 = rand_long();
> >    arg3 = rand_long();
> > 
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