On Tue, 2009-03-17 at 16:41 +0800, CAI Qian wrote:
> Hi,
>
> Sometimes, writev06 test case failed due to receiving a SIGSEGV signal,
>
> <<<test_start>>>
> tag=writev06 stime=1236859804
> cmdline="writev06"
> contacts=""
> analysis=exit
> initiation_status="ok"
> <<<test_output>>>
> writev06 1 BROK : Unexpected signal 11 received.
> writev06 2 FAIL : unlink Failed--file = writev_data_file.23185,
> errno = 2
> incrementing stop
> <<<execution_status>>>
> duration=0 termination_type=exited termination_id=3 corefile=no
> cutime=0 cstime=0
> <<<test_end>>>
>
> The test gives too little information to figure it out what might be
> wrong. This failure is not always reproducible, and I have seen the
> SIGSEGV has just arrived after a few mmap() calls. The following patch
> makes it easier to debug this type of failure by fixing error checking
> code for mmap() calls.
>
> Signed-off-by: CAI Qian <[email protected]>
Thanks.
Regards--
Subrata
>
> --- testcases/kernel/syscalls/writev/writev06.c.orig 2009-03-17
> 16:10:44.000000000 +0800
> +++ testcases/kernel/syscalls/writev/writev06.c 2009-03-17
> 16:26:58.000000000 +0800
> @@ -193,20 +193,28 @@
> * mapping around */
> bad_addr[0] = mmap(NULL, page_size * 3, PROT_NONE,
> MAP_PRIVATE_EXCEPT_UCLINUX|MAP_ANONYMOUS, 0, 0);
> + if (bad_addr[0] == MAP_FAILED)
> + tst_brkm(TBROK, cleanup, "mmap failed for bad_addr[0]");
> +
> good_addr[0] = mmap(NULL, page_size, PROT_READ|PROT_WRITE,
> MAP_PRIVATE_EXCEPT_UCLINUX|MAP_ANONYMOUS, 0, 0);
> + if (good_addr[0] == MAP_FAILED)
> + tst_brkm(TBROK, cleanup, "mmap failed for good_addr[0]");
> +
> bad_addr[1] = mmap(NULL, page_size * 3, PROT_NONE,
> MAP_PRIVATE_EXCEPT_UCLINUX|MAP_ANONYMOUS, 0, 0);
> + if (bad_addr[1] == MAP_FAILED)
> + tst_brkm(TBROK, cleanup, "mmap failed for bad_addr[1]");
> +
> good_addr[1] = mmap(NULL, page_size, PROT_READ|PROT_WRITE,
> MAP_PRIVATE_EXCEPT_UCLINUX|MAP_ANONYMOUS, 0, 0);
> + if (good_addr[1] == MAP_FAILED)
> + tst_brkm(TBROK, cleanup, "mmap failed for good_addr[1]");
> +
> bad_addr[2] = mmap(NULL, page_size * 3, PROT_NONE,
> MAP_PRIVATE_EXCEPT_UCLINUX|MAP_ANONYMOUS, 0, 0);
> -
> - if (good_addr[0] <= 0 || good_addr[1] <= 0 ||
> - bad_addr[0] <= 0 || bad_addr[0] <= 0 ||
> - bad_addr[2] <= 0) {
> - printf("mmap failed\n");
> - }
> + if (bad_addr[2] == MAP_FAILED)
> + tst_brkm(TBROK, cleanup, "mmap failed for bad_addr[2]");
>
> /* force page fault for writable mappings*/
> memset(good_addr[0],'a', page_size);
>
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easily build your RIAs with Flex Builder, the Eclipse(TM)based development
software that enables intelligent coding and step-through debugging.
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