Re: [LTP] Failure of syscalls in kernel version 3.4

[Jan Stancek <jstancek@redhat.com>]

----- Original Message -----
> From: "Om Prakash PAL" <omprakash.pal@stericsson.com>
> To: "Jan Stancek" <jstancek@redhat.com>
> Cc: ltp-list@lists.sourceforge.net
> Sent: Friday, 27 July, 2012 11:12:24 AM
> Subject: RE: [LTP] Failure of syscalls in kernel version 3.4
> 
> Hi Jan,
> Thanks for your reply.
> I have moved to latest LTP.
> After that some test cases are failing like:
>  
> [1].
>  shmat01
>  shmat01     1  TFAIL  :  shmat call failed: TEST_ERRNO=EINVAL(22):
>  Invalid argument

I could reproduce this issue with following change:
----------------------------------------------------
diff --git a/testcases/kernel/syscalls/ipc/shmat/shmat01.c b/testcases/kernel/syscalls/ipc/shmat/shmat01.c
index 7c68459..5d6e79c 100644
--- a/testcases/kernel/syscalls/ipc/shmat/shmat01.c
+++ b/testcases/kernel/syscalls/ipc/shmat/shmat01.c
@@ -271,6 +271,8 @@ void setup(void)
                tst_brkm(TBROK, cleanup, "Couldn't detach shared memory");
        }
 
+        printf(" ");
+
        /* some architectures (e.g. parisc) are strange, so better always align to
         * next SHMLBA address. */
        base_addr =
----------------------------------------------------

What happens in setup() is that shared memory is attached/detached, and that
address is used in the rest of the test. In case above glibc needs
extra page and mmaps one at same exact spot:
----------------------------------------------------
shmget(0x61008d5b, 4, IPC_CREAT|IPC_EXCL|0600) = 2260995
shmat(2260995, 0, 0)                    = ?
shmdt(0x7ffabd573000)                   = 0
fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7ffabd573000
shmat(2260995, 0x7ffabd573000, 0)       = -1 EINVAL (Invalid argument)
----------------------------------------------------

I'm assuming something like this happens in your case too,
output from "strace ./shmat01" would be helpful.

Regards,
Jan

> 
> 
> any idea about this one?.
> 
> Best Regards,
> Om Prakash Pal
> 
> -----Original Message-----
> From: Jan Stancek [mailto:jstancek@redhat.com]
> Sent: Friday, July 27, 2012 2:30 PM
> To: Om Prakash PAL
> Cc: ltp-list@lists.sourceforge.net
> Subject: Re: [LTP] Failure of syscalls in kernel version 3.4
> 
> 
> ----- Original Message -----
> > From: "Om Prakash PAL" <omprakash.pal@stericsson.com>
> > To: ltp-list@lists.sourceforge.net
> > Sent: Monday, 2 July, 2012 8:49:20 AM
> > Subject: [LTP] Failure of syscalls in kernel version 3.4
> >
> > Hi,
> >
> > I am currently using ltp-full-20110915.bz2.
> > When I switched to  kernel 3.4(from kernel 3.0)  then these
> > syscalls ltp are failing.
> 
> I'd suggest you try latest LTP from git. Some of these failures
> should be already fixed.
> (Latest I ran was kernel 3.3 and it ran fine for the ones you listed)
> 
> > [1]. get_robust_list01
> > get_robust_list01    1  TPASS  :  get_robust_list failed as
> > expected with EFAULT
> > get_robust_list01    2  TPASS  :  get_robust_list failed as
> > expected with EFAULT
> > get_robust_list01    3  TPASS  :  get_robust_list failed as
> > expected with ESRCH
> > get_robust_list01    4  TFAIL  :  get_robust_list succeeded
> > unexpectedly
> > get_robust_list01    5  TPASS  :  get_robust_list succeeded
> > 
> > [2]. gettimeofday02
> > gettimeofday02    0  TINFO  :  checking if gettimeofday is
> > monotonous, takes 30s
> > gettimeofday02    1  TFAIL  :  Time is going backwards: old 946
> >  
> > 
> > [3]. lseek03
> > lseek03     1  TFAIL  :  lseek(tfile_16887, 1, 4) Failed, errno=6
> > No such device or address, expected 22(EINVAL)
> > lseek03     2  TPASS  :  lseek(tfile_16887, 1, -1) Failed, errno=22
> > : Invalid argument
> > lseek03     3  TPASS  :  lseek(tfile_16887, 1, 7) Failed, errno=22
> > : Invalid argument
> 
> > [4]. readlink03
> > readlink03    1  TPASS  :  readlink(), No Search permissions to
> > process, returned errno 13
> > readlink03    2  TPASS  :  readlink(), No Search permissions to
> > process, returned errno 13
> > readlink03    3  TPASS  :  readlink(), Buffer size is not positive,
> > returned errno 22
> > readlink03    4  TPASS  :  readlink(), Buffer size is not positive,
> > returned errno 22
> > readlink03    5  TPASS  :  readlink(), File is not symbolic link,
> > returned errno 22
> > readlink03    6  TPASS  :  readlink(), File is not symbolic link,
> > returned errno 22
> > readlink03    7  TPASS  :  readlink(), Symlink path too long,
> > returned errno 36
> > readlink03    8  TPASS  :  readlink(), Symlink path too long,
> > returned errno 36
> > readlink03    9  TFAIL  :  readlink() failed, Symlink Pathname is
> > empty, errno=2, expected errno=22
> > 
> > [5] shmat01
> > shmat01     1  TFAIL  :  shmat call failed: TEST_ERRNO=EINVAL(22):
> > Invalid argument
> > 
> > [6] sysctl01
> > sysctl01    1  TFAIL  :  sysctl(2) failed unexpectedly errno:38
> > sysctl01    2  TFAIL  :  sysctl(2) failed unexpectedly errno:38
> > sysctl01    3  TFAIL  :  sysctl(2) failed unexpectedly errno:38
> 38 is ENOSYS, this works only if your kernel supports it
> (CONFIG_SYSCTL=y).
> 
> > 
> > any idea why these testcases are failing now?.
> Kernel implementation moved forward, your LTP is almost year old.
> 
> Regards,
> Jan
> 
> > How can I resolve it?.
> > 
> > Best Regards,
> > Om Prakash Pal
> 

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