Date: Sun, 14 Jun 2009 16:27:45 +0200 (CEST) From: Alexander Best <alexbestms@math.uni-muenster.de> To: <freebsd-current@FreeBSD.org> Subject: linux syscall get_robust_list causes panic Message-ID: <permail-20090614142745f7e55a9d00004f58-a_best01@message-id.uni-muenster.de>
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[-- Attachment #1 --]
hi there,
i tried to run the latest release (20090531) of the linux test project (ltp)
with emulators/linux_dist-gentoo-stage3. however the kernel panics after ltp's
get_robust_list(2) test. set_robust_list(2) passes without any problems.
i've attached a screenshot of the panic and the source which is causing the
panic. you won't be able to compile it without ltp however. after installing
and compiling ltp the source and the executable can be found in
"/usr/local/gentoo-stage3/ltp-full-20090531/testcases/kernel/syscalls/get_robust_list".
simply running the
"/usr/local/gentoo-stage3/ltp-full-20090531/testcases/kernel/syscalls/get_robust_list/get_robust_list01"
executable results in a panic.
unfortunately i cannot supply a complete bt, because i only own a usb keyboard
which doesn't respond after the panic. actually i'm a bit surprised the
debugger was started, because i have "KDB_UNATTENDED" in my kernel conf. any
reason the machine doesn't reboot and save the dump to /var/crash/vmcore.*?
i'm running r193846 (CURRENT).
cheers.
[-- Attachment #2 --]
/*
*
* Copyright (c) International Business Machines Corp., 2001
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Test Name: get_robust_list01
*
* Test Description:
* Verify that get_robust_list() returns the proper errno for various failure
* cases
*
* Usage: <for command-line>
* get_robust_list01 [-c n] [-e][-i n] [-I x] [-p x] [-t]
* where, -c n : Run n copies concurrently.
* -e : Turn on errno logging.
* -i n : Execute test n times.
* -I x : Execute test for x seconds.
* -P x : Pause for x seconds between iterations.
* -t : Turn on syscall timing.
*
* History
* 07/2008 Ramon de Carvalho Valle <rcvalle@br.ibm.com>
* -Created
*
* Restrictions:
* None.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include "test.h"
#include "usctest.h"
char *TCID = "get_robust_list01"; /* test program identifier. */
int TST_TOTAL = 5; /* total number of tests in this file. */
#ifdef __NR_get_robust_list
struct robust_list {
struct robust_list *next;
};
struct robust_list_head {
struct robust_list list;
long futex_offset;
struct robust_list *list_op_pending;
};
extern int Tst_count; /* counter for tst_xxx routines. */
int exp_enos[] = { ESRCH, EPERM, EFAULT, 0 };
void setup(void);
void cleanup(void);
int main(int argc, char **argv)
{
int lc; /* loop counter */
char *msg; /* message returned from parse_opts */
struct robust_list_head head;
size_t len_ptr; /* size of structure struct robust_list_head */
int retval;
msg = parse_opts(argc, argv, (option_t *) NULL, NULL);
if (msg != (char *)NULL) {
tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg);
tst_exit();
}
setup();
len_ptr = sizeof(struct robust_list_head);
for (lc = 0; TEST_LOOPING(lc); ++lc) {
Tst_count = 0;
/*
* The get_robust_list function fails with EFAULT if the size of the
* struct robust_list_head can't be stored in the memory address space
* specified by len_ptr argument, or the head of the robust list can't
* be stored in the memory address space specified by the head_ptr
* argument.
*/
TEST(retval = syscall(__NR_get_robust_list, 0,
(struct robust_list_head *)&head,
(size_t *) NULL));
if (TEST_RETURN) {
if (TEST_ERRNO == EFAULT)
tst_resm(TPASS,
"get_robust_list: retval = %d (expected %d), "
"errno = %d (expected %d)",
TEST_RETURN, -1, TEST_ERRNO, EFAULT);
else
tst_resm(TFAIL,
"get_robust_list: retval = %d (expected %d), "
"errno = %d (expected %d)",
TEST_RETURN, -1, TEST_ERRNO, EFAULT);
} else {
tst_resm(TFAIL,
"get_robust_list: retval = %d (expected %d), "
"errno = %d (expected %d)", TEST_RETURN, -1,
TEST_ERRNO, EFAULT);
}
TEST(retval = syscall(__NR_get_robust_list, 0,
(struct robust_list_head **)NULL,
&len_ptr));
if (TEST_RETURN) {
if (TEST_ERRNO == EFAULT)
tst_resm(TPASS,
"get_robust_list: retval = %d (expected %d), "
"errno = %d (expected %d)",
TEST_RETURN, -1, TEST_ERRNO, EFAULT);
else
tst_resm(TFAIL,
"get_robust_list: retval = %d (expected %d), "
"errno = %d (expected %d)",
TEST_RETURN, -1, TEST_ERRNO, EFAULT);
} else {
tst_resm(TFAIL,
"get_robust_list: retval = %d (expected %d), "
"errno = %d (expected %d)", TEST_RETURN, -1,
TEST_ERRNO, EFAULT);
}
/*
* The get_robust_list function fails with ESRCH if it can't find the
* task specified by the pid argument. The value 65535 is used as the
* pid argument.
*/
TEST(retval = syscall(__NR_get_robust_list, 65535,
(struct robust_list_head *)&head,
&len_ptr));
if (TEST_RETURN) {
if (TEST_ERRNO == ESRCH)
tst_resm(TPASS,
"get_robust_list: retval = %d (expected %d), "
"errno = %d (expected %d)",
TEST_RETURN, -1, TEST_ERRNO, ESRCH);
else
tst_resm(TFAIL,
"get_robust_list: retval = %d (expected %d), "
"errno = %d (expected %d)",
TEST_RETURN, -1, TEST_ERRNO, ESRCH);
} else {
tst_resm(TFAIL,
"get_robust_list: retval = %d (expected %d), "
"errno = %d (expected %d)", TEST_RETURN, -1,
TEST_ERRNO, ESRCH);
}
/*
* The get_robust_list function fails with EPERM if it has no
* permission to access the task specified by the pid argument.
* The current user id of the process is changed to 1 (bin), and the
* value of 1 (init) is used as the pid argument.
*/
/*
* Temporarily drop root privleges.
*/
seteuid(1);
TEST(retval = syscall(__NR_get_robust_list, 1,
(struct robust_list_head *)&head,
&len_ptr));
if (TEST_RETURN) {
if (TEST_ERRNO == EPERM)
tst_resm(TPASS,
"get_robust_list: retval = %d (expected %d), "
"errno = %d (expected %d)",
TEST_RETURN, -1, TEST_ERRNO, EPERM);
else
tst_resm(TFAIL,
"get_robust_list: retval = %d (expected %d), "
"errno = %d (expected %d)",
TEST_RETURN, -1, TEST_ERRNO, EPERM);
} else {
tst_resm(TFAIL,
"get_robust_list: retval = %d (expected %d), "
"errno = %d (expected %d)", TEST_RETURN, -1,
TEST_ERRNO, EPERM);
}
/*
* Regain root privileges.
*/
seteuid(0);
/*
* This call to get_robust_list function should be sucessful.
*/
TEST(retval = syscall(__NR_get_robust_list, 0,
(struct robust_list_head **)&head,
&len_ptr));
if (TEST_RETURN == 0) {
tst_resm(TPASS,
"get_robust_list: retval = %d (expected %d), "
"errno = %d (expected %d)", TEST_RETURN, 0,
TEST_ERRNO, 0);
} else {
tst_resm(TFAIL,
"get_robust_list: retval = %d (expected %d), "
"errno = %d (expected %d)", TEST_RETURN, 0,
TEST_ERRNO, 0);
}
}
cleanup();
exit(EXIT_SUCCESS);
}
void setup(void)
{
TEST_EXP_ENOS(exp_enos);
TEST_PAUSE;
}
void cleanup(void)
{
TEST_CLEANUP;
tst_exit();
}
#else
int main()
{
tst_resm(TCONF, "get_robust_list: system call not available");
tst_exit();
}
#endif
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