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[LTP] [PATCH] munmap() don't check sysctl_max_mapcount
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From: <ca...@re...> - 2010-11-30 10:28:42
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>From http://lkml.org/lkml/2009/10/2/85: On ia64, the following test program exit abnormally, because glibc thread library called abort(). ======================================================== (gdb) bt #0 0xa000000000010620 in __kernel_syscall_via_break () #1 0x20000000003208e0 in raise () from /lib/libc.so.6.1 #2 0x2000000000324090 in abort () from /lib/libc.so.6.1 #3 0x200000000027c3e0 in __deallocate_stack () from /lib/libpthread.so.0 #4 0x200000000027f7c0 in start_thread () from /lib/libpthread.so.0 #5 0x200000000047ef60 in __clone2 () from /lib/libc.so.6.1 ======================================================== The fact is, glibc call munmap() when thread exitng time for freeing stack, and it assume munlock() never fail. However, munmap() often make vma splitting and it with many mapcount make -ENOMEM. Oh well, stack unfreeing is not reasonable option. Also munlock() via free() shouldn't failed. Thus, munmap() shoudn't check max-mapcount. Signed-off-by: CAI Qian <ca...@re...> --- runtest/syscalls | 1 + testcases/kernel/syscalls/mmap/Makefile | 2 + testcases/kernel/syscalls/mmap/mmap11.c | 161 +++++++++++++++++++++++++++++++ 3 files changed, 164 insertions(+), 0 deletions(-) create mode 100644 testcases/kernel/syscalls/mmap/mmap11.c diff --git a/runtest/syscalls b/runtest/syscalls index d8f9b20..b256b9f 100644 --- a/runtest/syscalls +++ b/runtest/syscalls @@ -1288,3 +1288,4 @@ writev04 writev04 writev05 writev05 writev06 writev06 +mmap11 mmap11 -i 30000 \ No newline at end of file diff --git a/testcases/kernel/syscalls/mmap/Makefile b/testcases/kernel/syscalls/mmap/Makefile index bd617d8..68771cd 100644 --- a/testcases/kernel/syscalls/mmap/Makefile +++ b/testcases/kernel/syscalls/mmap/Makefile @@ -21,3 +21,5 @@ top_srcdir ?= ../../../.. include $(top_srcdir)/include/mk/testcases.mk include $(top_srcdir)/include/mk/generic_leaf_target.mk + +LDLIBS += -lpthread \ No newline at end of file diff --git a/testcases/kernel/syscalls/mmap/mmap11.c b/testcases/kernel/syscalls/mmap/mmap11.c new file mode 100644 index 0000000..55b7af5 --- /dev/null +++ b/testcases/kernel/syscalls/mmap/mmap11.c @@ -0,0 +1,161 @@ +/* + * munmap() don't check sysctl_max_mapcount + * + * From http://lkml.org/lkml/2009/10/2/85: + * + * On ia64, the following test program exit abnormally, because glibc + * thread library called abort(). + * + * ======================================================== + * (gdb) bt + * #0 0xa000000000010620 in __kernel_syscall_via_break () + * #1 0x20000000003208e0 in raise () from /lib/libc.so.6.1 + * #2 0x2000000000324090 in abort () from /lib/libc.so.6.1 + * #3 0x200000000027c3e0 in __deallocate_stack () from + * /lib/libpthread.so.0 + * #4 0x200000000027f7c0 in start_thread () from /lib/libpthread.so.0 + * #5 0x200000000047ef60 in __clone2 () from /lib/libc.so.6.1 + * ======================================================== + * The fact is, glibc call munmap() when thread exitng time for freeing + * stack, and it assume munlock() never fail. However, munmap() often + * make vma splitting and it with many mapcount make -ENOMEM. + * + * Oh well, stack unfreeing is not reasonable option. Also munlock() via + * free() shouldn't failed. + * + * Thus, munmap() shoudn't check max-mapcount. + * + * Copyright (C) 2010 Red Hat, Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it would be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. + * + * Further, this software is distributed without any warranty that it is + * free of the rightful claim of any third person regarding infringement + * or the like. Any license provided herein, whether implied or + * otherwise, applies only to this software file. Patent licenses, if + * any, provided herein do not apply to combinations of this program + * with other software, or any other product whatsoever. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write the Free Software Foundation, + * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + */ +#include<stdio.h> +#include<stdlib.h> +#include<string.h> +#include<pthread.h> +#include<errno.h> +#include<unistd.h> +#include "test.h" +#include "usctest.h" + +char *TCID = "mmap11"; +int TST_TOTAL = 1; +extern int Tst_count; + +#define MAL_SIZE (100*1024) + +static void *wait_thread(void *args); +static void *wait_thread2(void *args); +static void setup(void); +static void cleanup(void) LTP_ATTRIBUTE_NORETURN; +static int check(void); + +int main(int argc, char *argv[]) +{ + char *msg; + + msg = parse_opts(argc, argv, NULL, NULL); + if (msg != NULL) + tst_brkm(TBROK, tst_exit, "OPTION PARSING ERROR - %s", + msg); + setup(); + TEST(check()); + cleanup(); +} +void setup(void) +{ + /* capture signals */ + tst_sig(FORK, DEF_HANDLER, cleanup); + + /* Pause if that option was specified */ + TEST_PAUSE; + + tst_tmpdir(); +} +void cleanup(void) +{ + /* + * print timing stats if that option was specified. + * print errno log if that option was specified. + */ + TEST_CLEANUP; + + /* exit with return code appropriate for results */ + tst_rmdir(); + tst_exit(); +} +int check(void) +{ + int lc; + pthread_t *thread, th; + int ret, count = 0; + pthread_attr_t attr; + + ret = pthread_attr_init(&attr); + if(ret) + tst_brkm(TBROK|TERRNO, cleanup, "pthread_attr_init"); + + ret = pthread_attr_setdetachstate(&attr, + PTHREAD_CREATE_DETACHED); + if(ret) + tst_brkm(TBROK|TERRNO, cleanup, + "pthread_attr_setdetachstate"); + + thread = malloc(STD_LOOP_COUNT * sizeof(pthread_t)); + if (thread == NULL) + tst_brkm(TBROK|TERRNO, cleanup, "malloc"); + + for (lc = 0; TEST_LOOPING(lc); lc++) { + /* Reset Tst_count in case we are looping. */ + Tst_count = 0; + + ret = pthread_create(&th, &attr, wait_thread, NULL); + if(ret) { + tst_resm(TINFO, "[%d] ", count); + tst_brkm(TBROK|TERRNO, cleanup, + "pthread_create"); + } + count++; + ret = pthread_create(&thread[lc], &attr, wait_thread2, + NULL); + if(ret) { + tst_resm(TINFO, "[%d] ", count); + tst_brkm(TBROK|TERRNO, cleanup, + "pthread_create"); + } + count++; + } + tst_resm(TPASS, "test completed."); + free(thread); + return 0; +} +void *wait_thread(void *args) +{ + void *addr; + addr = malloc(MAL_SIZE); + if (addr) + memset(addr, 1, MAL_SIZE); + sleep(1); + return NULL; +} +void *wait_thread2(void *args) +{ + return NULL; +} -- 1.7.1 |
