lttng-statedump-impl.c

   1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
   2  *
   3  * lttng-statedump.c
   4  *
   5  * Linux Trace Toolkit Next Generation Kernel State Dump
   6  *
   7  * Copyright 2005 Jean-Hugues Deschenes <jean-hugues.deschenes@polymtl.ca>
   8  * Copyright 2006-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   9  *
  10  * Changes:
  11  *      Eric Clement:                   Add listing of network IP interface
  12  *      2006, 2007 Mathieu Desnoyers    Fix kernel threads
  13  *                                      Various updates
  14  */
  15
  16 #include <linux/init.h>
  17 #include <linux/module.h>
  18 #include <linux/netlink.h>
  19 #include <linux/inet.h>
  20 #include <linux/ip.h>
  21 #include <linux/kthread.h>
  22 #include <linux/proc_fs.h>
  23 #include <linux/file.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/irqnr.h>
  26 #include <linux/cpu.h>
  27 #include <linux/netdevice.h>
  28 #include <linux/inetdevice.h>
  29 #include <linux/sched.h>
  30 #include <linux/mm.h>
  31 #include <linux/swap.h>
  32 #include <linux/wait.h>
  33 #include <linux/mutex.h>
  34 #include <linux/device.h>
  35
  36 #include <lttng-events.h>
  37 #include <lttng-tracer.h>
  38 #include <wrapper/fdtable.h>
  39 #include <wrapper/namespace.h>
  40 #include <wrapper/irq.h>
  41 #include <wrapper/tracepoint.h>
  42 #include <wrapper/genhd.h>
  43 #include <wrapper/file.h>
  44 #include <wrapper/fdtable.h>
  45
  46 #ifdef CONFIG_LTTNG_HAS_LIST_IRQ
  47 #include <linux/irq.h>
  48 #endif
  49
  50 /* Define the tracepoints, but do not build the probes */
  51 #define CREATE_TRACE_POINTS
  52 #define TRACE_INCLUDE_PATH instrumentation/events/lttng-module
  53 #define TRACE_INCLUDE_FILE lttng-statedump
  54 #define LTTNG_INSTRUMENTATION
  55 #include <instrumentation/events/lttng-module/lttng-statedump.h>
  56
  57 DEFINE_TRACE(lttng_statedump_block_device);
  58 DEFINE_TRACE(lttng_statedump_end);
  59 DEFINE_TRACE(lttng_statedump_interrupt);
  60 DEFINE_TRACE(lttng_statedump_file_descriptor);
  61 DEFINE_TRACE(lttng_statedump_start);
  62 DEFINE_TRACE(lttng_statedump_process_state);
  63 DEFINE_TRACE(lttng_statedump_process_pid_ns);
  64 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,6,0))
  65 DEFINE_TRACE(lttng_statedump_process_cgroup_ns);
  66 #endif
  67 DEFINE_TRACE(lttng_statedump_process_ipc_ns);
  68 #ifndef LTTNG_MNT_NS_MISSING_HEADER
  69 DEFINE_TRACE(lttng_statedump_process_mnt_ns);
  70 #endif
  71 DEFINE_TRACE(lttng_statedump_process_net_ns);
  72 DEFINE_TRACE(lttng_statedump_process_user_ns);
  73 DEFINE_TRACE(lttng_statedump_process_uts_ns);
  74 DEFINE_TRACE(lttng_statedump_network_interface);
  75 #ifdef LTTNG_HAVE_STATEDUMP_CPU_TOPOLOGY
  76 DEFINE_TRACE(lttng_statedump_cpu_topology);
  77 #endif
  78
  79 struct lttng_fd_ctx {
  80         char *page;
  81         struct lttng_session *session;
  82         struct files_struct *files;
  83 };
  84
  85 /*
  86  * Protected by the trace lock.
  87  */
  88 static struct delayed_work cpu_work[NR_CPUS];
  89 static DECLARE_WAIT_QUEUE_HEAD(statedump_wq);
  90 static atomic_t kernel_threads_to_run;
  91
  92 enum lttng_thread_type {
  93         LTTNG_USER_THREAD = 0,
  94         LTTNG_KERNEL_THREAD = 1,
  95 };
  96
  97 enum lttng_execution_mode {
  98         LTTNG_USER_MODE = 0,
  99         LTTNG_SYSCALL = 1,
 100         LTTNG_TRAP = 2,
 101         LTTNG_IRQ = 3,
 102         LTTNG_SOFTIRQ = 4,
 103         LTTNG_MODE_UNKNOWN = 5,
 104 };
 105
 106 enum lttng_execution_submode {
 107         LTTNG_NONE = 0,
 108         LTTNG_UNKNOWN = 1,
 109 };
 110
 111 enum lttng_process_status {
 112         LTTNG_UNNAMED = 0,
 113         LTTNG_WAIT_FORK = 1,
 114         LTTNG_WAIT_CPU = 2,
 115         LTTNG_EXIT = 3,
 116         LTTNG_ZOMBIE = 4,
 117         LTTNG_WAIT = 5,
 118         LTTNG_RUN = 6,
 119         LTTNG_DEAD = 7,
 120 };
 121
 122 static
 123 int lttng_enumerate_block_devices(struct lttng_session *session)
 124 {
 125         struct class *ptr_block_class;
 126         struct device_type *ptr_disk_type;
 127         struct class_dev_iter iter;
 128         struct device *dev;
 129
 130         ptr_block_class = wrapper_get_block_class();
 131         if (!ptr_block_class)
 132                 return -ENOSYS;
 133         ptr_disk_type = wrapper_get_disk_type();
 134         if (!ptr_disk_type) {
 135                 return -ENOSYS;
 136         }
 137         class_dev_iter_init(&iter, ptr_block_class, NULL, ptr_disk_type);
 138         while ((dev = class_dev_iter_next(&iter))) {
 139                 struct disk_part_iter piter;
 140                 struct gendisk *disk = dev_to_disk(dev);
 141                 struct hd_struct *part;
 142
 143                 /*
 144                  * Don't show empty devices or things that have been
 145                  * suppressed
 146                  */
 147                 if (get_capacity(disk) == 0 ||
 148                     (disk->flags & GENHD_FL_SUPPRESS_PARTITION_INFO))
 149                         continue;
 150
 151                 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
 152                 while ((part = disk_part_iter_next(&piter))) {
 153                         char name_buf[BDEVNAME_SIZE];
 154                         char *p;
 155
 156                         p = wrapper_disk_name(disk, part->partno, name_buf);
 157                         if (!p) {
 158                                 disk_part_iter_exit(&piter);
 159                                 class_dev_iter_exit(&iter);
 160                                 return -ENOSYS;
 161                         }
 162                         trace_lttng_statedump_block_device(session,
 163                                         part_devt(part), name_buf);
 164                 }
 165                 disk_part_iter_exit(&piter);
 166         }
 167         class_dev_iter_exit(&iter);
 168         return 0;
 169 }
 170
 171 #ifdef CONFIG_INET
 172
 173 static
 174 void lttng_enumerate_device(struct lttng_session *session,
 175                 struct net_device *dev)
 176 {
 177         struct in_device *in_dev;
 178         struct in_ifaddr *ifa;
 179
 180         if (dev->flags & IFF_UP) {
 181                 in_dev = in_dev_get(dev);
 182                 if (in_dev) {
 183                         for (ifa = in_dev->ifa_list; ifa != NULL;
 184                              ifa = ifa->ifa_next) {
 185                                 trace_lttng_statedump_network_interface(
 186                                         session, dev, ifa);
 187                         }
 188                         in_dev_put(in_dev);
 189                 }
 190         } else {
 191                 trace_lttng_statedump_network_interface(
 192                         session, dev, NULL);
 193         }
 194 }
 195
 196 static
 197 int lttng_enumerate_network_ip_interface(struct lttng_session *session)
 198 {
 199         struct net_device *dev;
 200
 201         read_lock(&dev_base_lock);
 202         for_each_netdev(&init_net, dev)
 203                 lttng_enumerate_device(session, dev);
 204         read_unlock(&dev_base_lock);
 205
 206         return 0;
 207 }
 208 #else /* CONFIG_INET */
 209 static inline
 210 int lttng_enumerate_network_ip_interface(struct lttng_session *session)
 211 {
 212         return 0;
 213 }
 214 #endif /* CONFIG_INET */
 215
 216 static
 217 int lttng_dump_one_fd(const void *p, struct file *file, unsigned int fd)
 218 {
 219         const struct lttng_fd_ctx *ctx = p;
 220         const char *s = d_path(&file->f_path, ctx->page, PAGE_SIZE);
 221         unsigned int flags = file->f_flags;
 222         struct fdtable *fdt;
 223
 224         /*
 225          * We don't expose kernel internal flags, only userspace-visible
 226          * flags.
 227          */
 228         flags &= ~FMODE_NONOTIFY;
 229         fdt = files_fdtable(ctx->files);
 230         /*
 231          * We need to check here again whether fd is within the fdt
 232          * max_fds range, because we might be seeing a different
 233          * files_fdtable() than iterate_fd(), assuming only RCU is
 234          * protecting the read. In reality, iterate_fd() holds
 235          * file_lock, which should ensure the fdt does not change while
 236          * the lock is taken, but we are not aware whether this is
 237          * guaranteed or not, so play safe.
 238          */
 239         if (fd < fdt->max_fds && lttng_close_on_exec(fd, fdt))
 240                 flags |= O_CLOEXEC;
 241         if (IS_ERR(s)) {
 242                 struct dentry *dentry = file->f_path.dentry;
 243
 244                 /* Make sure we give at least some info */
 245                 spin_lock(&dentry->d_lock);
 246                 trace_lttng_statedump_file_descriptor(ctx->session,
 247                         ctx->files, fd, dentry->d_name.name, flags,
 248                         file->f_mode);
 249                 spin_unlock(&dentry->d_lock);
 250                 goto end;
 251         }
 252         trace_lttng_statedump_file_descriptor(ctx->session,
 253                 ctx->files, fd, s, flags, file->f_mode);
 254 end:
 255         return 0;
 256 }
 257
 258 /* Called with task lock held. */
 259 static
 260 void lttng_enumerate_files(struct lttng_session *session,
 261                 struct files_struct *files,
 262                 char *tmp)
 263 {
 264         struct lttng_fd_ctx ctx = { .page = tmp, .session = session, .files = files, };
 265
 266         lttng_iterate_fd(files, 0, lttng_dump_one_fd, &ctx);
 267 }
 268
 269 #ifdef LTTNG_HAVE_STATEDUMP_CPU_TOPOLOGY
 270 static
 271 int lttng_enumerate_cpu_topology(struct lttng_session *session)
 272 {
 273         int cpu;
 274         const cpumask_t *cpumask = cpu_possible_mask;
 275
 276         for (cpu = cpumask_first(cpumask); cpu < nr_cpu_ids;
 277                         cpu = cpumask_next(cpu, cpumask)) {
 278                 trace_lttng_statedump_cpu_topology(session, &cpu_data(cpu));
 279         }
 280
 281         return 0;
 282 }
 283 #else
 284 static
 285 int lttng_enumerate_cpu_topology(struct lttng_session *session)
 286 {
 287         return 0;
 288 }
 289 #endif
 290
 291 #if 0
 292 /*
 293  * FIXME: we cannot take a mmap_sem while in a RCU read-side critical section
 294  * (scheduling in atomic). Normally, the tasklist lock protects this kind of
 295  * iteration, but it is not exported to modules.
 296  */
 297 static
 298 void lttng_enumerate_task_vm_maps(struct lttng_session *session,
 299                 struct task_struct *p)
 300 {
 301         struct mm_struct *mm;
 302         struct vm_area_struct *map;
 303         unsigned long ino;
 304
 305         /* get_task_mm does a task_lock... */
 306         mm = get_task_mm(p);
 307         if (!mm)
 308                 return;
 309
 310         map = mm->mmap;
 311         if (map) {
 312                 down_read(&mm->mmap_sem);
 313                 while (map) {
 314                         if (map->vm_file)
 315                                 ino = map->vm_file->lttng_f_dentry->d_inode->i_ino;
 316                         else
 317                                 ino = 0;
 318                         trace_lttng_statedump_vm_map(session, p, map, ino);
 319                         map = map->vm_next;
 320                 }
 321                 up_read(&mm->mmap_sem);
 322         }
 323         mmput(mm);
 324 }
 325
 326 static
 327 int lttng_enumerate_vm_maps(struct lttng_session *session)
 328 {
 329         struct task_struct *p;
 330
 331         rcu_read_lock();
 332         for_each_process(p)
 333                 lttng_enumerate_task_vm_maps(session, p);
 334         rcu_read_unlock();
 335         return 0;
 336 }
 337 #endif
 338
 339 #ifdef CONFIG_LTTNG_HAS_LIST_IRQ
 340
 341 static
 342 int lttng_list_interrupts(struct lttng_session *session)
 343 {
 344         unsigned int irq;
 345         unsigned long flags = 0;
 346         struct irq_desc *desc;
 347
 348         /* needs irq_desc */
 349         for_each_irq_desc(irq, desc) {
 350                 struct irqaction *action;
 351                 const char *irq_chip_name =
 352                         irq_desc_get_chip(desc)->name ? : "unnamed_irq_chip";
 353
 354                 local_irq_save(flags);
 355                 raw_spin_lock(&desc->lock);
 356                 for (action = desc->action; action; action = action->next) {
 357                         trace_lttng_statedump_interrupt(session,
 358                                 irq, irq_chip_name, action);
 359                 }
 360                 raw_spin_unlock(&desc->lock);
 361                 local_irq_restore(flags);
 362         }
 363         return 0;
 364 }
 365 #else
 366 static inline
 367 int lttng_list_interrupts(struct lttng_session *session)
 368 {
 369         return 0;
 370 }
 371 #endif
 372
 373 /*
 374  * Statedump the task's namespaces using the proc filesystem inode number as
 375  * the unique identifier. The user and pid ns are nested and will be dumped
 376  * recursively.
 377  *
 378  * Called with task lock held.
 379  */
 380 static
 381 void lttng_statedump_process_ns(struct lttng_session *session,
 382                 struct task_struct *p,
 383                 enum lttng_thread_type type,
 384                 enum lttng_execution_mode mode,
 385                 enum lttng_execution_submode submode,
 386                 enum lttng_process_status status)
 387 {
 388         struct nsproxy *proxy;
 389         struct pid_namespace *pid_ns;
 390         struct user_namespace *user_ns;
 391
 392         /*
 393          * The pid and user namespaces are special, they are nested and
 394          * accessed with specific functions instead of the nsproxy struct
 395          * like the other namespaces.
 396          */
 397         pid_ns = task_active_pid_ns(p);
 398         do {
 399                 trace_lttng_statedump_process_pid_ns(session, p, pid_ns);
 400                 pid_ns = pid_ns ? pid_ns->parent : NULL;
 401         } while (pid_ns);
 402
 403
 404         user_ns = task_cred_xxx(p, user_ns);
 405         do {
 406                 trace_lttng_statedump_process_user_ns(session, p, user_ns);
 407                 /*
 408                  * trace_lttng_statedump_process_user_ns() internally
 409                  * checks whether user_ns is NULL. While this does not
 410                  * appear to be a possible return value for
 411                  * task_cred_xxx(), err on the safe side and check
 412                  * for NULL here as well to be consistent with the
 413                  * paranoid behavior of
 414                  * trace_lttng_statedump_process_user_ns().
 415                  */
 416                 user_ns = user_ns ? user_ns->lttng_user_ns_parent : NULL;
 417         } while (user_ns);
 418
 419         /*
 420          * Back and forth on locking strategy within Linux upstream for nsproxy.
 421          * See Linux upstream commit 728dba3a39c66b3d8ac889ddbe38b5b1c264aec3
 422          * "namespaces: Use task_lock and not rcu to protect nsproxy"
 423          * for details.
 424          */
 425 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,17,0) || \
 426                 LTTNG_UBUNTU_KERNEL_RANGE(3,13,11,36, 3,14,0,0) || \
 427                 LTTNG_UBUNTU_KERNEL_RANGE(3,16,1,11, 3,17,0,0) || \
 428                 LTTNG_RHEL_KERNEL_RANGE(3,10,0,229,13,0, 3,11,0,0,0,0))
 429         proxy = p->nsproxy;
 430 #else
 431         rcu_read_lock();
 432         proxy = task_nsproxy(p);
 433 #endif
 434         if (proxy) {
 435 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,6,0))
 436                 trace_lttng_statedump_process_cgroup_ns(session, p, proxy->cgroup_ns);
 437 #endif
 438                 trace_lttng_statedump_process_ipc_ns(session, p, proxy->ipc_ns);
 439 #ifndef LTTNG_MNT_NS_MISSING_HEADER
 440                 trace_lttng_statedump_process_mnt_ns(session, p, proxy->mnt_ns);
 441 #endif
 442                 trace_lttng_statedump_process_net_ns(session, p, proxy->net_ns);
 443                 trace_lttng_statedump_process_uts_ns(session, p, proxy->uts_ns);
 444         }
 445 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,17,0) || \
 446                 LTTNG_UBUNTU_KERNEL_RANGE(3,13,11,36, 3,14,0,0) || \
 447                 LTTNG_UBUNTU_KERNEL_RANGE(3,16,1,11, 3,17,0,0) || \
 448                 LTTNG_RHEL_KERNEL_RANGE(3,10,0,229,13,0, 3,11,0,0,0,0))
 449         /* (nothing) */
 450 #else
 451         rcu_read_unlock();
 452 #endif
 453 }
 454
 455 static
 456 int lttng_enumerate_process_states(struct lttng_session *session)
 457 {
 458         struct task_struct *g, *p;
 459         char *tmp;
 460
 461         tmp = (char *) __get_free_page(GFP_KERNEL);
 462         if (!tmp)
 463                 return -ENOMEM;
 464
 465         rcu_read_lock();
 466         for_each_process(g) {
 467                 struct files_struct *prev_files = NULL;
 468
 469                 p = g;
 470                 do {
 471                         enum lttng_execution_mode mode =
 472                                 LTTNG_MODE_UNKNOWN;
 473                         enum lttng_execution_submode submode =
 474                                 LTTNG_UNKNOWN;
 475                         enum lttng_process_status status;
 476                         enum lttng_thread_type type;
 477                         struct files_struct *files;
 478
 479                         task_lock(p);
 480                         if (p->exit_state == EXIT_ZOMBIE)
 481                                 status = LTTNG_ZOMBIE;
 482                         else if (p->exit_state == EXIT_DEAD)
 483                                 status = LTTNG_DEAD;
 484                         else if (p->state == TASK_RUNNING) {
 485                                 /* Is this a forked child that has not run yet? */
 486                                 if (list_empty(&p->rt.run_list))
 487                                         status = LTTNG_WAIT_FORK;
 488                                 else
 489                                         /*
 490                                          * All tasks are considered as wait_cpu;
 491                                          * the viewer will sort out if the task
 492                                          * was really running at this time.
 493                                          */
 494                                         status = LTTNG_WAIT_CPU;
 495                         } else if (p->state &
 496                                 (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)) {
 497                                 /* Task is waiting for something to complete */
 498                                 status = LTTNG_WAIT;
 499                         } else
 500                                 status = LTTNG_UNNAMED;
 501                         submode = LTTNG_NONE;
 502
 503                         /*
 504                          * Verification of t->mm is to filter out kernel
 505                          * threads; Viewer will further filter out if a
 506                          * user-space thread was in syscall mode or not.
 507                          */
 508                         if (p->mm)
 509                                 type = LTTNG_USER_THREAD;
 510                         else
 511                                 type = LTTNG_KERNEL_THREAD;
 512                         files = p->files;
 513
 514                         trace_lttng_statedump_process_state(session,
 515                                 p, type, mode, submode, status, files);
 516                         lttng_statedump_process_ns(session,
 517                                 p, type, mode, submode, status);
 518                         /*
 519                          * As an optimisation for the common case, do not
 520                          * repeat information for the same files_struct in
 521                          * two consecutive threads. This is the common case
 522                          * for threads sharing the same fd table. RCU guarantees
 523                          * that the same files_struct pointer is not re-used
 524                          * throughout processes/threads iteration.
 525                          */
 526                         if (files && files != prev_files) {
 527                                 lttng_enumerate_files(session, files, tmp);
 528                                 prev_files = files;
 529                         }
 530                         task_unlock(p);
 531                 } while_each_thread(g, p);
 532         }
 533         rcu_read_unlock();
 534
 535         free_page((unsigned long) tmp);
 536
 537         return 0;
 538 }
 539
 540 static
 541 void lttng_statedump_work_func(struct work_struct *work)
 542 {
 543         if (atomic_dec_and_test(&kernel_threads_to_run))
 544                 /* If we are the last thread, wake up do_lttng_statedump */
 545                 wake_up(&statedump_wq);
 546 }
 547
 548 static
 549 int do_lttng_statedump(struct lttng_session *session)
 550 {
 551         int cpu, ret;
 552
 553         trace_lttng_statedump_start(session);
 554         ret = lttng_enumerate_process_states(session);
 555         if (ret)
 556                 return ret;
 557         /*
 558          * FIXME
 559          * ret = lttng_enumerate_vm_maps(session);
 560          * if (ret)
 561          *      return ret;
 562          */
 563         ret = lttng_list_interrupts(session);
 564         if (ret)
 565                 return ret;
 566         ret = lttng_enumerate_network_ip_interface(session);
 567         if (ret)
 568                 return ret;
 569         ret = lttng_enumerate_block_devices(session);
 570         switch (ret) {
 571         case 0:
 572                 break;
 573         case -ENOSYS:
 574                 printk(KERN_WARNING "LTTng: block device enumeration is not supported by kernel\n");
 575                 break;
 576         default:
 577                 return ret;
 578         }
 579         ret = lttng_enumerate_cpu_topology(session);
 580         if (ret)
 581                 return ret;
 582
 583         /* TODO lttng_dump_idt_table(session); */
 584         /* TODO lttng_dump_softirq_vec(session); */
 585         /* TODO lttng_list_modules(session); */
 586         /* TODO lttng_dump_swap_files(session); */
 587
 588         /*
 589          * Fire off a work queue on each CPU. Their sole purpose in life
 590          * is to guarantee that each CPU has been in a state where is was in
 591          * syscall mode (i.e. not in a trap, an IRQ or a soft IRQ).
 592          */
 593         get_online_cpus();
 594         atomic_set(&kernel_threads_to_run, num_online_cpus());
 595         for_each_online_cpu(cpu) {
 596                 INIT_DELAYED_WORK(&cpu_work[cpu], lttng_statedump_work_func);
 597                 schedule_delayed_work_on(cpu, &cpu_work[cpu], 0);
 598         }
 599         /* Wait for all threads to run */
 600         __wait_event(statedump_wq, (atomic_read(&kernel_threads_to_run) == 0));
 601         put_online_cpus();
 602         /* Our work is done */
 603         trace_lttng_statedump_end(session);
 604         return 0;
 605 }
 606
 607 /*
 608  * Called with session mutex held.
 609  */
 610 int lttng_statedump_start(struct lttng_session *session)
 611 {
 612         return do_lttng_statedump(session);
 613 }
 614 EXPORT_SYMBOL_GPL(lttng_statedump_start);
 615
 616 static
 617 int __init lttng_statedump_init(void)
 618 {
 619         /*
 620          * Allow module to load even if the fixup cannot be done. This
 621          * will allow seemless transition when the underlying issue fix
 622          * is merged into the Linux kernel, and when tracepoint.c
 623          * "tracepoint_module_notify" is turned into a static function.
 624          */
 625         (void) wrapper_lttng_fixup_sig(THIS_MODULE);
 626         return 0;
 627 }
 628
 629 module_init(lttng_statedump_init);
 630
 631 static
 632 void __exit lttng_statedump_exit(void)
 633 {
 634 }
 635
 636 module_exit(lttng_statedump_exit);
 637
 638 MODULE_LICENSE("GPL and additional rights");
 639 MODULE_AUTHOR("Jean-Hugues Deschenes");
 640 MODULE_DESCRIPTION("LTTng statedump provider");
 641 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
 642         __stringify(LTTNG_MODULES_MINOR_VERSION) "."
 643         __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
 644         LTTNG_MODULES_EXTRAVERSION);