| Message ID | 20230127100553.29986-2-william.roche@oracle.com |
|---|---|
| State | Changes Requested |
| Headers | show |
| Series | Add some memory page soft-offlining control | expand |
Hello, william.roche@oracle.com writes: > From: William Roche <william.roche@oracle.com> > > Test a possible race condition between mmap() allocating memory and > madvise() used to Soft-offline an unrelated memory page. > As fixed with the following kernel commit: > d4ae9916ea29 mm: soft-offline: close the race against page allocation > > If everything works, restore all poisoned pages created by this test. OK, I think there is just some LTP specific stuff left to fix and setup/teardown issues. > > Signed-off-by: William Roche <william.roche@oracle.com> > --- > runtest/syscalls | 1 + > testcases/kernel/syscalls/madvise/.gitignore | 1 + > testcases/kernel/syscalls/madvise/Makefile | 3 + > testcases/kernel/syscalls/madvise/madvise11.c | 405 ++++++++++++++++++ > 4 files changed, 410 insertions(+) > create mode 100644 testcases/kernel/syscalls/madvise/madvise11.c > > diff --git a/runtest/syscalls b/runtest/syscalls > index ae37a1192..54098c4d9 100644 > --- a/runtest/syscalls > +++ b/runtest/syscalls > @@ -947,6 +947,7 @@ madvise07 madvise07 > madvise08 madvise08 > madvise09 madvise09 > madvise10 madvise10 > +madvise11 madvise11 > > newuname01 newuname01 > > diff --git a/testcases/kernel/syscalls/madvise/.gitignore b/testcases/kernel/syscalls/madvise/.gitignore > index f4bfdfefe..722ac3c34 100644 > --- a/testcases/kernel/syscalls/madvise/.gitignore > +++ b/testcases/kernel/syscalls/madvise/.gitignore > @@ -7,3 +7,4 @@ > /madvise08 > /madvise09 > /madvise10 > +/madvise11 > diff --git a/testcases/kernel/syscalls/madvise/Makefile b/testcases/kernel/syscalls/madvise/Makefile > index 044619fb8..9664c9ae2 100644 > --- a/testcases/kernel/syscalls/madvise/Makefile > +++ b/testcases/kernel/syscalls/madvise/Makefile > @@ -6,3 +6,6 @@ top_srcdir ?= ../../../.. > include $(top_srcdir)/include/mk/testcases.mk > > include $(top_srcdir)/include/mk/generic_leaf_target.mk > + > +madvise11: CFLAGS += -pthread > + > diff --git a/testcases/kernel/syscalls/madvise/madvise11.c b/testcases/kernel/syscalls/madvise/madvise11.c > new file mode 100644 > index 000000000..d55a69457 > --- /dev/null > +++ b/testcases/kernel/syscalls/madvise/madvise11.c > @@ -0,0 +1,405 @@ > +// SPDX-License-Identifier: GPL-2.0-or-later > +/* > + * Copyright (c) 2023 Oracle and/or its affiliates. > + */ > + > +/*\ > + * [Description] > + * > + * Stress a possible race condition between memory pages allocation > + * and soft-offline of unrelated pages as explained in the commit: > + * d4ae9916ea29 (mm: soft-offline: close the race against page allocation) > + * > + * Control that soft-offlined pages get correctly replaced: with the > + * same content and without SIGBUS generation when accessed. > + */ > + > +#include <errno.h> > +#include <pthread.h> > +#include <stdio.h> > +#include <stdlib.h> > +#include <time.h> > +#include <unistd.h> > +#include <sys/types.h> > +#include <sys/mman.h> > +#include <sys/klog.h> > + > +#include "tst_test.h" > +#include "tst_safe_pthread.h" > +#include "tst_safe_stdio.h" > +#include "lapi/mmap.h" > + > +#define NUM_LOOPS 5 > +#define NUM_PAGES 32 > +#define NUM_PAGES_OFFSET 5 > + > +/* Needed module to online back memory pages */ > +#define HW_MODULE "hwpoison_inject" > + > +static pthread_t *thread_ids; > +static int number_threads; > +static int run_iterations; > +static int maximum_pfns; > + > +static long pagesize; > +static char beginning_tag[BUFSIZ]; > +static int hwpoison_probe; > + > + > +static void my_yield(void) > +{ > + static const struct timespec t0 = { 0, 0 }; > + > + nanosleep(&t0, NULL); > +} > + > +/* a SIGBUS received is a confirmation of test failure */ > +static void sigbus_handler(int signum) > +{ > + tst_res(TFAIL, "SIGBUS Received"); Using tst_res in a signal handler is not safe although it usually works. Possibly it will result in some confusing output on some systems. Could we just set a global and read it later or drop it? > + _exit(signum); > +} > + > +/* > + * Allocate a page and write a sentinel value into it. > + */ > +static void *allocate_write(int sentinel) > +{ > + void *p; > + int *s; > + > + p = mmap(NULL, pagesize, PROT_READ|PROT_WRITE, > + MAP_SHARED|MAP_ANONYMOUS, -1, 0); > + if (p == MAP_FAILED) { > + tst_brk(TBROK | TTERRNO, "mmap unexpected error"); > + return NULL; > + } Is this duplicating SAFE_MMAP? I think mmap and the if statement can be replaced with it. > + s = (int *)p; > + *s = sentinel; > + return p; > +} > + > +/* > + * Verify and unmap the given page. > + */ > +static int verif_unmap(void *page, int sentinel) > +{ > + int *s = (int *)page; > + int ret; > + > + if (*s != sentinel) { > + tst_res(TFAIL, "pid[%d]: fail: bad sentinel value seen: %d expected: %d\n", getpid(), *s, sentinel); > + return 1; > + } > + > + ret = munmap(page, pagesize); > + if (ret == -1) > + tst_res(TINFO | TTERRNO, "munmap unexpected error"); Same here with munmap and SAFE_MUNMAP. > + > + return ret; > +} > + > +/* > + * allocate_offline() - Allocate and offline test called per-thread > + * > + * This function does the allocation and offline by mmapping an > + * anonymous page and offlining it. > + */ > +static int allocate_offline(int tnum) > +{ > + int loop; > + > + for (loop = 0; loop < NUM_LOOPS; loop++) { > + long *ptrs[NUM_PAGES]; > + int num_alloc; > + int i; > + > + for (num_alloc = 0; num_alloc < NUM_PAGES; num_alloc++) { > + > + ptrs[num_alloc] = allocate_write((tnum << NUM_PAGES_OFFSET) | num_alloc); > + if (ptrs[num_alloc] == NULL) > + return -1; > + > + if (madvise(ptrs[num_alloc], pagesize, MADV_SOFT_OFFLINE) == -1) { > + if (errno != EINVAL) > + tst_res(TFAIL | TERRNO, "madvise failed"); > + if (errno == EINVAL) > + tst_res(TCONF, "madvise() didn't support MADV_SOFT_OFFLINE"); > + return errno; > + } > + } > + > + for (i = 0; i < num_alloc; i++) { > + if (verif_unmap(ptrs[i], (tnum << NUM_PAGES_OFFSET) | i) != 0) > + return 1; > + } > + > + my_yield(); > + if (!tst_remaining_runtime()) { > + tst_res(TINFO, "Thread [%d]: Test runtime is over, exiting", tnum); > + break; > + } > + } > + > + return 0; > +} > + > +static void *alloc_mem(void *threadnum) > +{ > + int err; > + int tnum = (int)(uintptr_t)threadnum; > + > + /* waiting for other threads starting */ > + TST_CHECKPOINT_WAIT(0); > + > + err = allocate_offline(tnum); > + tst_res(TINFO, > + "Thread [%d] returned %d, %s.", tnum, err, (err ? "failed" : "succeeded")); > + return (void *)(uintptr_t) (err ? -1 : 0); > +} > + > +static void stress_alloc_offl(void) > +{ > + int thread_index; > + int thread_failure = 0; > + > + run_iterations++; > + > + for (thread_index = 0; thread_index < number_threads; thread_index++) { > + SAFE_PTHREAD_CREATE(&thread_ids[thread_index], NULL, alloc_mem, > + (void *)(uintptr_t)thread_index); > + } > + > + TST_CHECKPOINT_WAKE2(0, number_threads); > + > + for (thread_index = 0; thread_index < number_threads; thread_index++) { > + void *status; > + > + SAFE_PTHREAD_JOIN(thread_ids[thread_index], &status); > + if ((intptr_t)status != 0) { > + tst_res(TFAIL, "thread [%d] - exited with errors", > + thread_index); > + thread_failure++; > + } > + } > + > + if (thread_failure == 0) > + tst_res(TPASS, "soft-offline / mmap race still clean"); > +} > + > +/* > + * ------------ > + * Cleanup code: > + * The idea is to retrieve all the pfn numbers that have been soft-offined > + * (generating a "Soft offlining pfn 0x..." message in the kernel ring buffer) > + * by the current test (since a "beginning_tag" message we write when starting). > + * And to put these pages back online by writing the pfn number to the > + * <debugfs>/hwpoison/unpoison-pfn special file. > + * ------------ > + */ > +#define OFFLINE_PATTERN "Soft offlining pfn 0x" > +#define OFFLINE_PATTERN_LEN sizeof(OFFLINE_PATTERN) > + > +/* return the pfn if the kmsg msg is a soft-offline indication*/ > +static unsigned long parse_kmsg_soft_offlined_pfn(char *line, ssize_t len) > +{ > + char *pos; > + unsigned long addr = 0UL; > + > + pos = strstr(line, OFFLINE_PATTERN); > + if (pos == NULL) > + return 0UL; > + > + pos += OFFLINE_PATTERN_LEN-1; > + if (pos > (line + len)) > + return 0UL; > + > + addr = strtoul(pos, NULL, 16); > + if ((addr == ULONG_MAX) && (errno == ERANGE)) > + return 0UL; > + > + return addr; > +} > + > +/* return the pfns seen in kernel message log */ > +static int populate_from_klog(char *begin_tag, unsigned long *pfns, int max) > +{ > + int found = 0, fd, beginning_tag_found = 0; > + ssize_t sz; > + unsigned long pfn; > + char buf[BUFSIZ]; > + > + fd = SAFE_OPEN("/dev/kmsg", O_RDONLY|O_NONBLOCK); > + > + while (found < max) { > + sz = read(fd, buf, sizeof(buf)); > + /* kmsg returns EPIPE if record was modified while reading */ > + if (sz < 0 && errno == EPIPE) > + continue; > + if (sz <= 0) > + break; > + if (!beginning_tag_found) { > + if (strstr(buf, begin_tag)) > + beginning_tag_found = 1; > + continue; > + } > + pfn = parse_kmsg_soft_offlined_pfn(buf, sz); > + if (pfn) > + pfns[found++] = pfn; > + } > + SAFE_CLOSE(fd); > + return found; > +} > + > +/* > + * Read the given file to search for the key. > + * If a valuePtr is given, copy the remaining of the line right > + * after the found key to the given location. > + * Return 1 if the key is found. > + */ > +static int find_in_file(char *path, char *key, char *valuePtr) nit: we don't use camel case. Although I think this function can be replaced, see below. > +{ > + char line[4096]; > + char *pos = NULL; > + int found = 0; > + FILE *file = SAFE_FOPEN(path, "r"); > + > + while (fgets(line, sizeof(line), file)) { > + pos = strstr(line, key); > + if (pos) { > + found = 1; > + if (valuePtr) > + strncpy(valuePtr, pos + strlen(key), > + line + strlen(line) - pos); > + break; > + } > + } > + SAFE_FCLOSE(file); > + return found; > +} > + > +static void unpoison_this_pfn(unsigned long pfn, int fd) > +{ > + char pfn_str[19]; > + > + snprintf(pfn_str, sizeof(pfn_str), "0x%lx", pfn); > + SAFE_WRITE(0, fd, pfn_str, strlen(pfn_str)); > +} > + > +/* Find and open the <debugfs>/hwpoison/unpoison-pfn special file */ > +static int open_unpoison_pfn(void) > +{ > + char *added_file_path = "/hwpoison/unpoison-pfn"; > + const char *const cmd_modprobe[] = {"modprobe", HW_MODULE, NULL}; > + char debugfs_fp[4096]; > + > + if (!find_in_file("/proc/modules", HW_MODULE, NULL)) > + hwpoison_probe = 1; > + > + /* probe hwpoison only if it isn't already there */ > + if (hwpoison_probe) > + SAFE_CMD(cmd_modprobe, NULL, NULL); > + > + /* debugfs mount point */ > + if (find_in_file("/etc/mtab", "debugfs ", debugfs_fp) == 0) Scanning mtab with strstr is fragile, at the least "debugfs" can appear in a path. Instead please use setmntent and getmntent (you can copy & paste from tst_device or tst_cgroup). Or scanf the whole line etc.
diff --git a/runtest/syscalls b/runtest/syscalls index ae37a1192..54098c4d9 100644 --- a/runtest/syscalls +++ b/runtest/syscalls @@ -947,6 +947,7 @@ madvise07 madvise07 madvise08 madvise08 madvise09 madvise09 madvise10 madvise10 +madvise11 madvise11 newuname01 newuname01 diff --git a/testcases/kernel/syscalls/madvise/.gitignore b/testcases/kernel/syscalls/madvise/.gitignore index f4bfdfefe..722ac3c34 100644 --- a/testcases/kernel/syscalls/madvise/.gitignore +++ b/testcases/kernel/syscalls/madvise/.gitignore @@ -7,3 +7,4 @@ /madvise08 /madvise09 /madvise10 +/madvise11 diff --git a/testcases/kernel/syscalls/madvise/Makefile b/testcases/kernel/syscalls/madvise/Makefile index 044619fb8..9664c9ae2 100644 --- a/testcases/kernel/syscalls/madvise/Makefile +++ b/testcases/kernel/syscalls/madvise/Makefile @@ -6,3 +6,6 @@ top_srcdir ?= ../../../.. include $(top_srcdir)/include/mk/testcases.mk include $(top_srcdir)/include/mk/generic_leaf_target.mk + +madvise11: CFLAGS += -pthread + diff --git a/testcases/kernel/syscalls/madvise/madvise11.c b/testcases/kernel/syscalls/madvise/madvise11.c new file mode 100644 index 000000000..d55a69457 --- /dev/null +++ b/testcases/kernel/syscalls/madvise/madvise11.c @@ -0,0 +1,405 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (c) 2023 Oracle and/or its affiliates. + */ + +/*\ + * [Description] + * + * Stress a possible race condition between memory pages allocation + * and soft-offline of unrelated pages as explained in the commit: + * d4ae9916ea29 (mm: soft-offline: close the race against page allocation) + * + * Control that soft-offlined pages get correctly replaced: with the + * same content and without SIGBUS generation when accessed. + */ + +#include <errno.h> +#include <pthread.h> +#include <stdio.h> +#include <stdlib.h> +#include <time.h> +#include <unistd.h> +#include <sys/types.h> +#include <sys/mman.h> +#include <sys/klog.h> + +#include "tst_test.h" +#include "tst_safe_pthread.h" +#include "tst_safe_stdio.h" +#include "lapi/mmap.h" + +#define NUM_LOOPS 5 +#define NUM_PAGES 32 +#define NUM_PAGES_OFFSET 5 + +/* Needed module to online back memory pages */ +#define HW_MODULE "hwpoison_inject" + +static pthread_t *thread_ids; +static int number_threads; +static int run_iterations; +static int maximum_pfns; + +static long pagesize; +static char beginning_tag[BUFSIZ]; +static int hwpoison_probe; + + +static void my_yield(void) +{ + static const struct timespec t0 = { 0, 0 }; + + nanosleep(&t0, NULL); +} + +/* a SIGBUS received is a confirmation of test failure */ +static void sigbus_handler(int signum) +{ + tst_res(TFAIL, "SIGBUS Received"); + _exit(signum); +} + +/* + * Allocate a page and write a sentinel value into it. + */ +static void *allocate_write(int sentinel) +{ + void *p; + int *s; + + p = mmap(NULL, pagesize, PROT_READ|PROT_WRITE, + MAP_SHARED|MAP_ANONYMOUS, -1, 0); + if (p == MAP_FAILED) { + tst_brk(TBROK | TTERRNO, "mmap unexpected error"); + return NULL; + } + s = (int *)p; + *s = sentinel; + return p; +} + +/* + * Verify and unmap the given page. + */ +static int verif_unmap(void *page, int sentinel) +{ + int *s = (int *)page; + int ret; + + if (*s != sentinel) { + tst_res(TFAIL, "pid[%d]: fail: bad sentinel value seen: %d expected: %d\n", getpid(), *s, sentinel); + return 1; + } + + ret = munmap(page, pagesize); + if (ret == -1) + tst_res(TINFO | TTERRNO, "munmap unexpected error"); + + return ret; +} + +/* + * allocate_offline() - Allocate and offline test called per-thread + * + * This function does the allocation and offline by mmapping an + * anonymous page and offlining it. + */ +static int allocate_offline(int tnum) +{ + int loop; + + for (loop = 0; loop < NUM_LOOPS; loop++) { + long *ptrs[NUM_PAGES]; + int num_alloc; + int i; + + for (num_alloc = 0; num_alloc < NUM_PAGES; num_alloc++) { + + ptrs[num_alloc] = allocate_write((tnum << NUM_PAGES_OFFSET) | num_alloc); + if (ptrs[num_alloc] == NULL) + return -1; + + if (madvise(ptrs[num_alloc], pagesize, MADV_SOFT_OFFLINE) == -1) { + if (errno != EINVAL) + tst_res(TFAIL | TERRNO, "madvise failed"); + if (errno == EINVAL) + tst_res(TCONF, "madvise() didn't support MADV_SOFT_OFFLINE"); + return errno; + } + } + + for (i = 0; i < num_alloc; i++) { + if (verif_unmap(ptrs[i], (tnum << NUM_PAGES_OFFSET) | i) != 0) + return 1; + } + + my_yield(); + if (!tst_remaining_runtime()) { + tst_res(TINFO, "Thread [%d]: Test runtime is over, exiting", tnum); + break; + } + } + + return 0; +} + +static void *alloc_mem(void *threadnum) +{ + int err; + int tnum = (int)(uintptr_t)threadnum; + + /* waiting for other threads starting */ + TST_CHECKPOINT_WAIT(0); + + err = allocate_offline(tnum); + tst_res(TINFO, + "Thread [%d] returned %d, %s.", tnum, err, (err ? "failed" : "succeeded")); + return (void *)(uintptr_t) (err ? -1 : 0); +} + +static void stress_alloc_offl(void) +{ + int thread_index; + int thread_failure = 0; + + run_iterations++; + + for (thread_index = 0; thread_index < number_threads; thread_index++) { + SAFE_PTHREAD_CREATE(&thread_ids[thread_index], NULL, alloc_mem, + (void *)(uintptr_t)thread_index); + } + + TST_CHECKPOINT_WAKE2(0, number_threads); + + for (thread_index = 0; thread_index < number_threads; thread_index++) { + void *status; + + SAFE_PTHREAD_JOIN(thread_ids[thread_index], &status); + if ((intptr_t)status != 0) { + tst_res(TFAIL, "thread [%d] - exited with errors", + thread_index); + thread_failure++; + } + } + + if (thread_failure == 0) + tst_res(TPASS, "soft-offline / mmap race still clean"); +} + +/* + * ------------ + * Cleanup code: + * The idea is to retrieve all the pfn numbers that have been soft-offined + * (generating a "Soft offlining pfn 0x..." message in the kernel ring buffer) + * by the current test (since a "beginning_tag" message we write when starting). + * And to put these pages back online by writing the pfn number to the + * <debugfs>/hwpoison/unpoison-pfn special file. + * ------------ + */ +#define OFFLINE_PATTERN "Soft offlining pfn 0x" +#define OFFLINE_PATTERN_LEN sizeof(OFFLINE_PATTERN) + +/* return the pfn if the kmsg msg is a soft-offline indication*/ +static unsigned long parse_kmsg_soft_offlined_pfn(char *line, ssize_t len) +{ + char *pos; + unsigned long addr = 0UL; + + pos = strstr(line, OFFLINE_PATTERN); + if (pos == NULL) + return 0UL; + + pos += OFFLINE_PATTERN_LEN-1; + if (pos > (line + len)) + return 0UL; + + addr = strtoul(pos, NULL, 16); + if ((addr == ULONG_MAX) && (errno == ERANGE)) + return 0UL; + + return addr; +} + +/* return the pfns seen in kernel message log */ +static int populate_from_klog(char *begin_tag, unsigned long *pfns, int max) +{ + int found = 0, fd, beginning_tag_found = 0; + ssize_t sz; + unsigned long pfn; + char buf[BUFSIZ]; + + fd = SAFE_OPEN("/dev/kmsg", O_RDONLY|O_NONBLOCK); + + while (found < max) { + sz = read(fd, buf, sizeof(buf)); + /* kmsg returns EPIPE if record was modified while reading */ + if (sz < 0 && errno == EPIPE) + continue; + if (sz <= 0) + break; + if (!beginning_tag_found) { + if (strstr(buf, begin_tag)) + beginning_tag_found = 1; + continue; + } + pfn = parse_kmsg_soft_offlined_pfn(buf, sz); + if (pfn) + pfns[found++] = pfn; + } + SAFE_CLOSE(fd); + return found; +} + +/* + * Read the given file to search for the key. + * If a valuePtr is given, copy the remaining of the line right + * after the found key to the given location. + * Return 1 if the key is found. + */ +static int find_in_file(char *path, char *key, char *valuePtr) +{ + char line[4096]; + char *pos = NULL; + int found = 0; + FILE *file = SAFE_FOPEN(path, "r"); + + while (fgets(line, sizeof(line), file)) { + pos = strstr(line, key); + if (pos) { + found = 1; + if (valuePtr) + strncpy(valuePtr, pos + strlen(key), + line + strlen(line) - pos); + break; + } + } + SAFE_FCLOSE(file); + return found; +} + +static void unpoison_this_pfn(unsigned long pfn, int fd) +{ + char pfn_str[19]; + + snprintf(pfn_str, sizeof(pfn_str), "0x%lx", pfn); + SAFE_WRITE(0, fd, pfn_str, strlen(pfn_str)); +} + +/* Find and open the <debugfs>/hwpoison/unpoison-pfn special file */ +static int open_unpoison_pfn(void) +{ + char *added_file_path = "/hwpoison/unpoison-pfn"; + const char *const cmd_modprobe[] = {"modprobe", HW_MODULE, NULL}; + char debugfs_fp[4096]; + + if (!find_in_file("/proc/modules", HW_MODULE, NULL)) + hwpoison_probe = 1; + + /* probe hwpoison only if it isn't already there */ + if (hwpoison_probe) + SAFE_CMD(cmd_modprobe, NULL, NULL); + + /* debugfs mount point */ + if (find_in_file("/etc/mtab", "debugfs ", debugfs_fp) == 0) + return -1; + strcpy(strstr(debugfs_fp, " "), added_file_path); + + return SAFE_OPEN(debugfs_fp, O_WRONLY); +} + +/* + * Get all the Offlined PFNs indicated in the dmesg output + * starting after the given beginning tag, and request a debugfs + * hwpoison/unpoison-pfn for each of them. + */ +static void unpoison_pfn(char *begin_tag) +{ + unsigned long *pfns; + const char *const cmd_rmmod[] = {"rmmod", HW_MODULE, NULL}; + int found_pfns, fd; + + pfns = SAFE_MALLOC(sizeof(pfns) * maximum_pfns * run_iterations); + + fd = open_unpoison_pfn(); + if (fd >= 0) { + found_pfns = populate_from_klog(begin_tag, pfns, maximum_pfns * run_iterations); + + tst_res(TINFO, "Restore %d Soft-offlined pages", found_pfns); + /* unpoison in reverse order */ + while (found_pfns-- > 0) + unpoison_this_pfn(pfns[found_pfns], fd); + + SAFE_CLOSE(fd); + } + /* remove hwpoison only if we probed it */ + if (hwpoison_probe) + SAFE_CMD(cmd_rmmod, NULL, NULL); +} + +/* + * Create and write a beginning tag to the kernel buffer to be used on cleanup + * when trying to restore the soft-offlined pages of our test run. + */ +static void write_beginning_tag_to_kmsg(void) +{ + int fd; + + fd = SAFE_OPEN("/dev/kmsg", O_WRONLY); + snprintf(beginning_tag, sizeof(beginning_tag), + "Soft-offlining pages test starting (pid: %ld)", + (long)getpid()); + SAFE_WRITE(1, fd, beginning_tag, strlen(beginning_tag)); + SAFE_CLOSE(fd); +} + +static void setup(void) +{ + struct sigaction my_sigaction; + + number_threads = (int)sysconf(_SC_NPROCESSORS_ONLN) * 2; + if (number_threads <= 1) + number_threads = 2; + else if (number_threads > 5) + number_threads = 5; + + maximum_pfns = number_threads * NUM_LOOPS * NUM_PAGES; + thread_ids = SAFE_MALLOC(sizeof(pthread_t) * number_threads); + pagesize = sysconf(_SC_PAGESIZE); + + /* SIGBUS is the main failure criteria */ + my_sigaction.sa_handler = sigbus_handler; + if (sigaction(SIGBUS, &my_sigaction, NULL) == -1) + tst_res(TFAIL | TERRNO, "Signal handler attach failed"); + + write_beginning_tag_to_kmsg(); + tst_res(TINFO, "Spawning %d threads, with a total of %d memory pages", + number_threads, maximum_pfns); +} + +static void cleanup(void) +{ + unpoison_pfn(beginning_tag); +} + +static struct tst_test test = { + .needs_root = 1, + .needs_drivers = (const char *const []) { + HW_MODULE, + NULL + }, + .needs_cmds = (const char *[]) { + "modprobe", + "rmmod", + NULL + }, + .max_runtime = 30, + .needs_checkpoints = 1, + .setup = setup, + .cleanup = cleanup, + .test_all = stress_alloc_offl, + .tags = (const struct tst_tag[]) { + {"linux-git", "d4ae9916ea29"}, + {} + } +};