Re: [PATCH 5/5] kernel: Convert kthread to use setup_thread_fn

From: kernel test robot
Date: Sun Feb 12 2023 - 22:42:28 EST

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Hi Mike,

I love your patch! Perhaps something to improve:

[auto build test WARNING on tip/sched/core]
[also build test WARNING on vfs-idmapping/for-next linus/master v6.2-rc8]
[cannot apply to next-20230210]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url: https://github.com/intel-lab-lkp/linux/commits/Mike-Christie/kernel-Move-kernel_clone_args-s-fn-to-new-struct/20230213-090304
patch link: https://lore.kernel.org/r/20230213010020.1813-6-michael.christie%40oracle.com
patch subject: [PATCH 5/5] kernel: Convert kthread to use setup_thread_fn
config: i386-defconfig (https://download.01.org/0day-ci/archive/20230213/202302131111.s59th1pG-lkp@xxxxxxxxx/config)
compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
reproduce (this is a W=1 build):
# https://github.com/intel-lab-lkp/linux/commit/9b34e5869b059d529620a0144a93c7437411cca0
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review Mike-Christie/kernel-Move-kernel_clone_args-s-fn-to-new-struct/20230213-090304
git checkout 9b34e5869b059d529620a0144a93c7437411cca0
# save the config file
mkdir build_dir && cp config build_dir/.config
make W=1 O=build_dir ARCH=i386 olddefconfig
make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Link: https://lore.kernel.org/oe-kbuild-all/202302131111.s59th1pG-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

kernel/fork.c: In function 'copy_process':
>> kernel/fork.c:2565:1: warning: label 'bad_fork_cleanup_delayacct' defined but not used [-Wunused-label]
2565 | bad_fork_cleanup_delayacct:
| ^~~~~~~~~~~~~~~~~~~~~~~~~~

vim +/bad_fork_cleanup_delayacct +2565 kernel/fork.c

d741bf41d7c7db Peter Zijlstra 2020-08-29 2371
7e47682ea555e7 Aleksa Sarai 2015-06-09 2372 /*
7e47682ea555e7 Aleksa Sarai 2015-06-09 2373 * Ensure that the cgroup subsystem policies allow the new process to be
7b7b8a2c9560ef Randy Dunlap 2020-10-15 2374 * forked. It should be noted that the new process's css_set can be changed
7e47682ea555e7 Aleksa Sarai 2015-06-09 2375 * between here and cgroup_post_fork() if an organisation operation is in
7e47682ea555e7 Aleksa Sarai 2015-06-09 2376 * progress.
7e47682ea555e7 Aleksa Sarai 2015-06-09 2377 */
ef2c41cf38a755 Christian Brauner 2020-02-05 2378 retval = cgroup_can_fork(p, args);
7e47682ea555e7 Aleksa Sarai 2015-06-09 2379 if (retval)
5a5cf5cb30d781 Christian Brauner 2020-02-05 2380 goto bad_fork_put_pidfd;
7e47682ea555e7 Aleksa Sarai 2015-06-09 2381
b1e8206582f9d6 Peter Zijlstra 2022-02-14 2382 /*
b1e8206582f9d6 Peter Zijlstra 2022-02-14 2383 * Now that the cgroups are pinned, re-clone the parent cgroup and put
b1e8206582f9d6 Peter Zijlstra 2022-02-14 2384 * the new task on the correct runqueue. All this *before* the task
b1e8206582f9d6 Peter Zijlstra 2022-02-14 2385 * becomes visible.
b1e8206582f9d6 Peter Zijlstra 2022-02-14 2386 *
b1e8206582f9d6 Peter Zijlstra 2022-02-14 2387 * This isn't part of ->can_fork() because while the re-cloning is
b1e8206582f9d6 Peter Zijlstra 2022-02-14 2388 * cgroup specific, it unconditionally needs to place the task on a
b1e8206582f9d6 Peter Zijlstra 2022-02-14 2389 * runqueue.
b1e8206582f9d6 Peter Zijlstra 2022-02-14 2390 */
b1e8206582f9d6 Peter Zijlstra 2022-02-14 2391 sched_cgroup_fork(p, args);
b1e8206582f9d6 Peter Zijlstra 2022-02-14 2392
7b55851367136b David Herrmann 2019-01-08 2393 /*
7b55851367136b David Herrmann 2019-01-08 2394 * From this point on we must avoid any synchronous user-space
7b55851367136b David Herrmann 2019-01-08 2395 * communication until we take the tasklist-lock. In particular, we do
7b55851367136b David Herrmann 2019-01-08 2396 * not want user-space to be able to predict the process start-time by
7b55851367136b David Herrmann 2019-01-08 2397 * stalling fork(2) after we recorded the start_time but before it is
7b55851367136b David Herrmann 2019-01-08 2398 * visible to the system.
7b55851367136b David Herrmann 2019-01-08 2399 */
7b55851367136b David Herrmann 2019-01-08 2400
7b55851367136b David Herrmann 2019-01-08 2401 p->start_time = ktime_get_ns();
cf25e24db61cc9 Peter Zijlstra 2019-11-07 2402 p->start_boottime = ktime_get_boottime_ns();
7b55851367136b David Herrmann 2019-01-08 2403
18c830df771f2b Oleg Nesterov 2013-07-03 2404 /*
18c830df771f2b Oleg Nesterov 2013-07-03 2405 * Make it visible to the rest of the system, but dont wake it up yet.
18c830df771f2b Oleg Nesterov 2013-07-03 2406 * Need tasklist lock for parent etc handling!
18c830df771f2b Oleg Nesterov 2013-07-03 2407 */
^1da177e4c3f41 Linus Torvalds 2005-04-16 2408 write_lock_irq(&tasklist_lock);
^1da177e4c3f41 Linus Torvalds 2005-04-16 2409
^1da177e4c3f41 Linus Torvalds 2005-04-16 2410 /* CLONE_PARENT re-uses the old parent */
2d5516cbb9daf7 Oleg Nesterov 2009-03-02 2411 if (clone_flags & (CLONE_PARENT|CLONE_THREAD)) {
^1da177e4c3f41 Linus Torvalds 2005-04-16 2412 p->real_parent = current->real_parent;
2d5516cbb9daf7 Oleg Nesterov 2009-03-02 2413 p->parent_exec_id = current->parent_exec_id;
b4e00444cab4c3 Eddy Wu 2020-11-07 2414 if (clone_flags & CLONE_THREAD)
b4e00444cab4c3 Eddy Wu 2020-11-07 2415 p->exit_signal = -1;
b4e00444cab4c3 Eddy Wu 2020-11-07 2416 else
b4e00444cab4c3 Eddy Wu 2020-11-07 2417 p->exit_signal = current->group_leader->exit_signal;
2d5516cbb9daf7 Oleg Nesterov 2009-03-02 2418 } else {
^1da177e4c3f41 Linus Torvalds 2005-04-16 2419 p->real_parent = current;
2d5516cbb9daf7 Oleg Nesterov 2009-03-02 2420 p->parent_exec_id = current->self_exec_id;
b4e00444cab4c3 Eddy Wu 2020-11-07 2421 p->exit_signal = args->exit_signal;
2d5516cbb9daf7 Oleg Nesterov 2009-03-02 2422 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 2423
d83a7cb375eec2 Josh Poimboeuf 2017-02-13 2424 klp_copy_process(p);
d83a7cb375eec2 Josh Poimboeuf 2017-02-13 2425
85dd3f61203c5c Peter Zijlstra 2021-03-29 2426 sched_core_fork(p);
85dd3f61203c5c Peter Zijlstra 2021-03-29 2427
^1da177e4c3f41 Linus Torvalds 2005-04-16 2428 spin_lock(&current->sighand->siglock);
4a2c7a7837da1b Oleg Nesterov 2006-03-28 2429
792575348ff70e Daniel Bristot de Oliveira 2022-07-29 2430 rv_task_fork(p);
792575348ff70e Daniel Bristot de Oliveira 2022-07-29 2431
d7822b1e24f2df Mathieu Desnoyers 2018-06-02 2432 rseq_fork(p, clone_flags);
d7822b1e24f2df Mathieu Desnoyers 2018-06-02 2433
4ca1d3ee46130e Eric W. Biederman 2018-07-13 2434 /* Don't start children in a dying pid namespace */
e8cfbc245e2488 Gargi Sharma 2017-11-17 2435 if (unlikely(!(ns_of_pid(pid)->pid_allocated & PIDNS_ADDING))) {
3fd37226216620 Kirill Tkhai 2017-05-12 2436 retval = -ENOMEM;
3fd37226216620 Kirill Tkhai 2017-05-12 2437 goto bad_fork_cancel_cgroup;
3fd37226216620 Kirill Tkhai 2017-05-12 2438 }
4a2c7a7837da1b Oleg Nesterov 2006-03-28 2439
7673bf553b2732 Eric W. Biederman 2018-07-23 2440 /* Let kill terminate clone/fork in the middle */
7673bf553b2732 Eric W. Biederman 2018-07-23 2441 if (fatal_signal_pending(current)) {
7673bf553b2732 Eric W. Biederman 2018-07-23 2442 retval = -EINTR;
7673bf553b2732 Eric W. Biederman 2018-07-23 2443 goto bad_fork_cancel_cgroup;
7673bf553b2732 Eric W. Biederman 2018-07-23 2444 }
7673bf553b2732 Eric W. Biederman 2018-07-23 2445
a1140cb215fa13 Kuniyuki Iwashima 2022-08-23 2446 /* No more failure paths after this point. */
a1140cb215fa13 Kuniyuki Iwashima 2022-08-23 2447
a1140cb215fa13 Kuniyuki Iwashima 2022-08-23 2448 /*
a1140cb215fa13 Kuniyuki Iwashima 2022-08-23 2449 * Copy seccomp details explicitly here, in case they were changed
a1140cb215fa13 Kuniyuki Iwashima 2022-08-23 2450 * before holding sighand lock.
a1140cb215fa13 Kuniyuki Iwashima 2022-08-23 2451 */
a1140cb215fa13 Kuniyuki Iwashima 2022-08-23 2452 copy_seccomp(p);
a1140cb215fa13 Kuniyuki Iwashima 2022-08-23 2453
2c4704756cab7c Eric W. Biederman 2017-09-26 2454 init_task_pid_links(p);
73b9ebfe126a4a Oleg Nesterov 2006-03-28 2455 if (likely(p->pid)) {
4b9d33e6d83cc0 Tejun Heo 2011-06-17 2456 ptrace_init_task(p, (clone_flags & CLONE_PTRACE) || trace);
^1da177e4c3f41 Linus Torvalds 2005-04-16 2457
8190773985141f Oleg Nesterov 2013-07-03 2458 init_task_pid(p, PIDTYPE_PID, pid);
^1da177e4c3f41 Linus Torvalds 2005-04-16 2459 if (thread_group_leader(p)) {
6883f81aac6f44 Eric W. Biederman 2017-06-04 2460 init_task_pid(p, PIDTYPE_TGID, pid);
8190773985141f Oleg Nesterov 2013-07-03 2461 init_task_pid(p, PIDTYPE_PGID, task_pgrp(current));
8190773985141f Oleg Nesterov 2013-07-03 2462 init_task_pid(p, PIDTYPE_SID, task_session(current));
8190773985141f Oleg Nesterov 2013-07-03 2463
1c4042c29bd2e8 Eric W. Biederman 2010-07-12 2464 if (is_child_reaper(pid)) {
17cf22c33e1f1b Eric W. Biederman 2010-03-02 2465 ns_of_pid(pid)->child_reaper = p;
1c4042c29bd2e8 Eric W. Biederman 2010-07-12 2466 p->signal->flags |= SIGNAL_UNKILLABLE;
1c4042c29bd2e8 Eric W. Biederman 2010-07-12 2467 }
c3ad2c3b02e953 Eric W. Biederman 2018-07-23 2468 p->signal->shared_pending.signal = delayed.signal;
9c9f4ded90a59e Alan Cox 2008-10-13 2469 p->signal->tty = tty_kref_get(current->signal->tty);
749860ce242798 Pavel Tikhomirov 2017-01-30 2470 /*
749860ce242798 Pavel Tikhomirov 2017-01-30 2471 * Inherit has_child_subreaper flag under the same
749860ce242798 Pavel Tikhomirov 2017-01-30 2472 * tasklist_lock with adding child to the process tree
749860ce242798 Pavel Tikhomirov 2017-01-30 2473 * for propagate_has_child_subreaper optimization.
749860ce242798 Pavel Tikhomirov 2017-01-30 2474 */
749860ce242798 Pavel Tikhomirov 2017-01-30 2475 p->signal->has_child_subreaper = p->real_parent->signal->has_child_subreaper ||
749860ce242798 Pavel Tikhomirov 2017-01-30 2476 p->real_parent->signal->is_child_subreaper;
9cd80bbb07fcd6 Oleg Nesterov 2009-12-17 2477 list_add_tail(&p->sibling, &p->real_parent->children);
5e85d4abe3f43b Eric W. Biederman 2006-04-18 2478 list_add_tail_rcu(&p->tasks, &init_task.tasks);
6883f81aac6f44 Eric W. Biederman 2017-06-04 2479 attach_pid(p, PIDTYPE_TGID);
8190773985141f Oleg Nesterov 2013-07-03 2480 attach_pid(p, PIDTYPE_PGID);
8190773985141f Oleg Nesterov 2013-07-03 2481 attach_pid(p, PIDTYPE_SID);
909ea96468096b Christoph Lameter 2010-12-08 2482 __this_cpu_inc(process_counts);
80628ca06c5d42 Oleg Nesterov 2013-07-03 2483 } else {
80628ca06c5d42 Oleg Nesterov 2013-07-03 2484 current->signal->nr_threads++;
d80f7d7b2c75c5 Eric W. Biederman 2022-06-21 2485 current->signal->quick_threads++;
80628ca06c5d42 Oleg Nesterov 2013-07-03 2486 atomic_inc(&current->signal->live);
60d4de3ff7f775 Elena Reshetova 2019-01-18 2487 refcount_inc(&current->signal->sigcnt);
924de3b8c9410c Eric W. Biederman 2018-07-23 2488 task_join_group_stop(p);
80628ca06c5d42 Oleg Nesterov 2013-07-03 2489 list_add_tail_rcu(&p->thread_group,
80628ca06c5d42 Oleg Nesterov 2013-07-03 2490 &p->group_leader->thread_group);
0c740d0afc3bff Oleg Nesterov 2014-01-21 2491 list_add_tail_rcu(&p->thread_node,
0c740d0afc3bff Oleg Nesterov 2014-01-21 2492 &p->signal->thread_head);
^1da177e4c3f41 Linus Torvalds 2005-04-16 2493 }
8190773985141f Oleg Nesterov 2013-07-03 2494 attach_pid(p, PIDTYPE_PID);
^1da177e4c3f41 Linus Torvalds 2005-04-16 2495 nr_threads++;
73b9ebfe126a4a Oleg Nesterov 2006-03-28 2496 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 2497 total_forks++;
c3ad2c3b02e953 Eric W. Biederman 2018-07-23 2498 hlist_del_init(&delayed.node);
3f17da699431ec Oleg Nesterov 2006-02-15 2499 spin_unlock(&current->sighand->siglock);
4af4206be2bd19 Oleg Nesterov 2014-04-13 2500 syscall_tracepoint_update(p);
^1da177e4c3f41 Linus Torvalds 2005-04-16 2501 write_unlock_irq(&tasklist_lock);
4af4206be2bd19 Oleg Nesterov 2014-04-13 2502
ddc204b517e60a Waiman Long 2022-02-08 2503 if (pidfile)
ddc204b517e60a Waiman Long 2022-02-08 2504 fd_install(pidfd, pidfile);
ddc204b517e60a Waiman Long 2022-02-08 2505
c13cf856cbe16a Andrew Morton 2005-11-28 2506 proc_fork_connector(p);
b1e8206582f9d6 Peter Zijlstra 2022-02-14 2507 sched_post_fork(p);
ef2c41cf38a755 Christian Brauner 2020-02-05 2508 cgroup_post_fork(p, args);
cdd6c482c9ff9c Ingo Molnar 2009-09-21 2509 perf_event_fork(p);
43d2b113241d67 KAMEZAWA Hiroyuki 2012-01-10 2510
43d2b113241d67 KAMEZAWA Hiroyuki 2012-01-10 2511 trace_task_newtask(p, clone_flags);
3ab679661721b1 Oleg Nesterov 2013-10-16 2512 uprobe_copy_process(p, clone_flags);
43d2b113241d67 KAMEZAWA Hiroyuki 2012-01-10 2513
67197a4f28d28d Suren Baghdasaryan 2020-10-13 2514 copy_oom_score_adj(clone_flags, p);
67197a4f28d28d Suren Baghdasaryan 2020-10-13 2515
^1da177e4c3f41 Linus Torvalds 2005-04-16 2516 return p;
^1da177e4c3f41 Linus Torvalds 2005-04-16 2517
7e47682ea555e7 Aleksa Sarai 2015-06-09 2518 bad_fork_cancel_cgroup:
85dd3f61203c5c Peter Zijlstra 2021-03-29 2519 sched_core_free(p);
3fd37226216620 Kirill Tkhai 2017-05-12 2520 spin_unlock(&current->sighand->siglock);
3fd37226216620 Kirill Tkhai 2017-05-12 2521 write_unlock_irq(&tasklist_lock);
ef2c41cf38a755 Christian Brauner 2020-02-05 2522 cgroup_cancel_fork(p, args);
b3e5838252665e Christian Brauner 2019-03-27 2523 bad_fork_put_pidfd:
6fd2fe494b17bf Al Viro 2019-06-26 2524 if (clone_flags & CLONE_PIDFD) {
6fd2fe494b17bf Al Viro 2019-06-26 2525 fput(pidfile);
6fd2fe494b17bf Al Viro 2019-06-26 2526 put_unused_fd(pidfd);
6fd2fe494b17bf Al Viro 2019-06-26 2527 }
425fb2b4bf5dde Pavel Emelyanov 2007-10-18 2528 bad_fork_free_pid:
425fb2b4bf5dde Pavel Emelyanov 2007-10-18 2529 if (pid != &init_struct_pid)
425fb2b4bf5dde Pavel Emelyanov 2007-10-18 2530 free_pid(pid);
0740aa5f637568 Jiri Slaby 2016-05-20 2531 bad_fork_cleanup_thread:
0740aa5f637568 Jiri Slaby 2016-05-20 2532 exit_thread(p);
fd0928df98b957 Jens Axboe 2008-01-24 2533 bad_fork_cleanup_io:
b69f2292063d2c Louis Rilling 2009-12-04 2534 if (p->io_context)
b69f2292063d2c Louis Rilling 2009-12-04 2535 exit_io_context(p);
ab516013ad9ca4 Serge E. Hallyn 2006-10-02 2536 bad_fork_cleanup_namespaces:
444f378b237a0f Linus Torvalds 2007-01-30 2537 exit_task_namespaces(p);
^1da177e4c3f41 Linus Torvalds 2005-04-16 2538 bad_fork_cleanup_mm:
c3f3ce049f7d97 Andrea Arcangeli 2019-05-14 2539 if (p->mm) {
c3f3ce049f7d97 Andrea Arcangeli 2019-05-14 2540 mm_clear_owner(p->mm, p);
^1da177e4c3f41 Linus Torvalds 2005-04-16 2541 mmput(p->mm);
c3f3ce049f7d97 Andrea Arcangeli 2019-05-14 2542 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 2543 bad_fork_cleanup_signal:
4ab6c08336535f Oleg Nesterov 2009-08-26 2544 if (!(clone_flags & CLONE_THREAD))
1c5354de90c900 Mike Galbraith 2011-01-05 2545 free_signal_struct(p->signal);
^1da177e4c3f41 Linus Torvalds 2005-04-16 2546 bad_fork_cleanup_sighand:
a7e5328a06a2be Oleg Nesterov 2006-03-28 2547 __cleanup_sighand(p->sighand);
^1da177e4c3f41 Linus Torvalds 2005-04-16 2548 bad_fork_cleanup_fs:
^1da177e4c3f41 Linus Torvalds 2005-04-16 2549 exit_fs(p); /* blocking */
^1da177e4c3f41 Linus Torvalds 2005-04-16 2550 bad_fork_cleanup_files:
^1da177e4c3f41 Linus Torvalds 2005-04-16 2551 exit_files(p); /* blocking */
^1da177e4c3f41 Linus Torvalds 2005-04-16 2552 bad_fork_cleanup_semundo:
^1da177e4c3f41 Linus Torvalds 2005-04-16 2553 exit_sem(p);
e4e55b47ed9ae2 Tetsuo Handa 2017-03-24 2554 bad_fork_cleanup_security:
e4e55b47ed9ae2 Tetsuo Handa 2017-03-24 2555 security_task_free(p);
^1da177e4c3f41 Linus Torvalds 2005-04-16 2556 bad_fork_cleanup_audit:
^1da177e4c3f41 Linus Torvalds 2005-04-16 2557 audit_free(p);
6c72e3501d0d62 Peter Zijlstra 2014-10-02 2558 bad_fork_cleanup_perf:
cdd6c482c9ff9c Ingo Molnar 2009-09-21 2559 perf_event_free_task(p);
6c72e3501d0d62 Peter Zijlstra 2014-10-02 2560 bad_fork_cleanup_policy:
b09be676e0ff25 Byungchul Park 2017-08-07 2561 lockdep_free_task(p);
^1da177e4c3f41 Linus Torvalds 2005-04-16 2562 #ifdef CONFIG_NUMA
f0be3d32b05d3f Lee Schermerhorn 2008-04-28 2563 mpol_put(p->mempolicy);
^1da177e4c3f41 Linus Torvalds 2005-04-16 2564 #endif
ff8288ff475e47 Eric W. Biederman 2021-12-20 @2565 bad_fork_cleanup_delayacct:
35df17c57cecb0 Shailabh Nagar 2006-08-31 2566 delayacct_tsk_free(p);
^1da177e4c3f41 Linus Torvalds 2005-04-16 2567 bad_fork_cleanup_count:
21d1c5e386bc75 Alexey Gladkov 2021-04-22 2568 dec_rlimit_ucounts(task_ucounts(p), UCOUNT_RLIMIT_NPROC, 1);
e0e817392b9acf David Howells 2009-09-02 2569 exit_creds(p);
^1da177e4c3f41 Linus Torvalds 2005-04-16 2570 bad_fork_free:
2f064a59a11ff9 Peter Zijlstra 2021-06-11 2571 WRITE_ONCE(p->__state, TASK_DEAD);
1a03d3f13ffe5d Sebastian Andrzej Siewior 2022-02-17 2572 exit_task_stack_account(p);
68f24b08ee892d Andy Lutomirski 2016-09-15 2573 put_task_stack(p);
c3f3ce049f7d97 Andrea Arcangeli 2019-05-14 2574 delayed_free_task(p);
fe7d37d1fbf8ff Oleg Nesterov 2006-01-08 2575 fork_out:
c3ad2c3b02e953 Eric W. Biederman 2018-07-23 2576 spin_lock_irq(&current->sighand->siglock);
c3ad2c3b02e953 Eric W. Biederman 2018-07-23 2577 hlist_del_init(&delayed.node);
c3ad2c3b02e953 Eric W. Biederman 2018-07-23 2578 spin_unlock_irq(&current->sighand->siglock);
fe7d37d1fbf8ff Oleg Nesterov 2006-01-08 2579 return ERR_PTR(retval);
^1da177e4c3f41 Linus Torvalds 2005-04-16 2580 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 2581

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