Re: [LTP] [PATCH v3 2/2] clone/clone08.c: Add new flags

[Jan Stancek <jstancek@redhat.com>]

----- Original Message -----
> From: "Jan Stancek" <jstancek@redhat.com>
> To: "zenglg.jy" <zenglg.jy@cn.fujitsu.com>
> Cc: "ltp-list" <ltp-list@lists.sourceforge.net>
> Sent: Monday, 9 December, 2013 5:15:32 PM
> Subject: Re: [LTP] [PATCH v3 2/2] clone/clone08.c: Add new flags
> 
> 
> 
> I was running v3 with only "CLONE_THREAD" testcase enabled:
> -       {"CLONE_PARENT", CLONE_PARENT | CLONE_VM | SIGCHLD, NULL,
> -        child_clone_parent},
> -       {"CLONE_CHILD_SETTID", CLONE_CHILD_SETTID | CLONE_VM | SIGCHLD, NULL,
> -        child_clone_child_settid},
> -       {"CLONE_PARENT_SETTID", CLONE_PARENT_SETTID | CLONE_VM | SIGCHLD,
> NULL,
> -        child_clone_parent_settid},
> -#ifdef CLONE_STOPPED
> -       {"CLONE_STOPPED", CLONE_STOPPED | CLONE_VM | SIGCHLD,
> -        test_clone_stopped, child_clone_stopped},
> -#endif
> 
> and I see it failing/crashing sometimes. I usually see one of these failures:
> 
> 1. clone08     4  TBROK  :  Failed to read from pipe at clone08.c:168:
> errno=EAGAIN(11): Resource temporarily unavailable
> 2. clone08     1  TBROK  :  The other end of the pipe was closed unexpectedly
> at clone08.c:168
> 3. clone08     4  TPASS  :  test CLONE_THREAD success
>    clone08     1  TBROK  :  unexpected signal 11 received (pid = 8234).
>    clone08     2  TBROK  :  Remaining cases broken
>    clone08     1  TFAIL  :  son process exits error
> 4. no error, but test doesn't execute as many times as specified on command
> line
> 5. clone08     1  TBROK  :  unexpected signal 4 received (pid = 28936).

Some of above are caused by multiple threads reusing same stack area.
Trouble is that with single master child you can't be sure when
CLONE_THREAD child finished using its stack.

The idea I mentioned in v2 was basically what you did, but the loop for testcases
would be outside master child - which means spawning master_child for each testcase.

I'm travelling these days, but I can have a look at idea above later this week
and see how viable it is.

Regards,
Jan

> 
> Regards,
> Jan
> 
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