[peterz-queue:sched/flat] [sched/eevdf] 2bd899617c: WARNING:possible_circular_locking_dependency_detected

[kernel test robot]

Hello,

kernel test robot noticed "WARNING:possible_circular_locking_dependency_detected" on:

commit: 2bd899617ca34f2df57f351bf912d5630958d855 ("sched/eevdf: Move to a single runqueue")
https://git.kernel.org/cgit/linux/kernel/git/peterz/queue.git sched/flat

in testcase: boot

config: x86_64-randconfig-2005-20250721
compiler: gcc-14
test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 32G

(please refer to attached dmesg/kmsg for entire log/backtrace)


we run both 2bd899617c and its parent around 500 times, found the issues
happen randomly, but parent keeps clean.

=========================================================================================
tbox_group/testcase/rootfs/kconfig/compiler/sleep:
  vm-snb/boot/quantal-i386-core-20190426.cgz/x86_64-randconfig-2005-20250721/gcc-14/1

d80ef4715d611ac0 2bd899617ca34f2df57f351bf91
---------------- ---------------------------
       fail:runs  %reproduction    fail:runs
           |             |             |
           :500         13%          64:522   last_state.booting
           :500         13%          66:522   last_state.is_incomplete_run
           :500          0%           2:522   last_state.running
           :500         13%          67:522   dmesg.BUG:workqueue_lockup-pool
           :500          0%           1:522   dmesg.RIP:ftrace_likely_update
           :500         17%          86:522   dmesg.RIP:pick_task_fair
           :500         17%          86:522   dmesg.WARNING:possible_circular_locking_dependency_detected
           :500          1%           3:522   dmesg.WARNING:possible_circular_locking_dependency_detected_modprobe_is_trying_to_acquire_lock:at:console_lock_spinning_enable_but_task_is_already_holding_lock:at:raw_spin_rq_lock_nested
           :500          0%           1:522   dmesg.WARNING:possible_circular_locking_dependency_detected_rb_consumer_is_trying_to_acquire_lock:at:console_lock_spinning_enable_but_task_is_already_holding_lock:at:raw_spin_rq_lock_nested
           :500          5%          27:522   dmesg.WARNING:possible_circular_locking_dependency_detected_rcu_preempt_is_trying_to_acquire_lock:at:console_lock_spinning_enable_but_task_is_already_holding_lock:at:raw_spin_rq_lock_nested
           :500         11%          55:522   dmesg.WARNING:possible_circular_locking_dependency_detected_udevd_is_trying_to_acquire_lock:at:console_lock_spinning_enable_but_task_is_already_holding_lock:at:raw_spin_rq_lock_nested
           :500         17%          86:522   dmesg.boot_failures


If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <oliver.sang@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-lkp/202602240818.6fd9e413-lkp@xxxxxxxxx



[   22.650678][  T239] ------------[ cut here ]------------
[   22.650872][  T239]
[   22.650880][  T239] ======================================================
[   22.650888][  T239] WARNING: possible circular locking dependency detected
[   22.650899][  T239] 6.19.0-09429-g2bd899617ca3 #1 Tainted: G                T
[   22.650912][  T239] ------------------------------------------------------
[   22.650918][  T239] udevd/239 is trying to acquire lock:
[   22.650927][  T239] ffffffff84fe5fc0 (console_owner){..-.}-{0:0}, at: console_lock_spinning_enable (kernel/printk/printk.c:1902 (discriminator 1))
[   22.650984][  T239]
[   22.650984][  T239] but task is already holding lock:
[   22.650990][  T239] ffffffff84fb67e0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested (kernel/sched/core.c:649)
[   22.651041][  T239]
[   22.651041][  T239] which lock already depends on the new lock.
[   22.651041][  T239]
[   22.651047][  T239]
[   22.651047][  T239] the existing dependency chain (in reverse order) is:
[   22.651054][  T239]
[   22.651054][  T239] -> #4 (&rq->__lock){-.-.}-{2:2}:
[   22.651081][  T239]        validate_chain (kernel/locking/lockdep.c:3285 kernel/locking/lockdep.c:3908)
[   22.651101][  T239]        __lock_acquire (kernel/locking/lockdep.c:5237 (discriminator 1))
[   22.651121][  T239]        lock_acquire (kernel/locking/lockdep.c:470 kernel/locking/lockdep.c:5870)
[   22.651139][  T239]        _raw_spin_lock_nested (kernel/locking/spinlock.c:379)
[   22.651168][  T239]        raw_spin_rq_lock_nested (kernel/sched/core.c:649)
[   22.651192][  T239]        raw_spin_rq_lock (kernel/sched/sched.h:1622)
[   22.651216][  T239]        ___task_rq_lock (kernel/sched/sched.h:2403 (discriminator 2) kernel/sched/core.c:726 (discriminator 2))
[   22.651240][  T239]        wake_up_new_task (kernel/sched/core.c:4826)
[   22.651258][  T239]        kernel_clone (kernel/fork.c:2688 (discriminator 1))
[   22.651275][  T239]        user_mode_thread (kernel/fork.c:2722)
[   22.651292][  T239]        rest_init (init/main.c:725)
[   22.651308][  T239]        start_kernel (init/main.c:1210)
[   22.651330][  T239]        x86_64_start_reservations (arch/x86/kernel/head64.c:310)
[   22.651353][  T239]        x86_64_start_kernel (??:?)
[   22.651374][  T239]        common_startup_64 (arch/x86/kernel/head_64.S:419)
[   22.651401][  T239]
[   22.651401][  T239] -> #3 (&p->pi_lock){-.-.}-{2:2}:
[   22.651429][  T239]        validate_chain (kernel/locking/lockdep.c:3285 kernel/locking/lockdep.c:3908)
[   22.651448][  T239]        __lock_acquire (kernel/locking/lockdep.c:5237 (discriminator 1))
[   22.651467][  T239]        lock_acquire (kernel/locking/lockdep.c:470 kernel/locking/lockdep.c:5870)
[   22.651486][  T239]        _raw_spin_lock_irqsave (include/linux/spinlock_api_smp.h:133 kernel/locking/spinlock.c:162)
[   22.651513][  T239]        try_to_wake_up (include/linux/spinlock.h:570 kernel/sched/core.c:4176)
[   22.651530][  T239]        default_wake_function (kernel/sched/core.c:7285)
[   22.651548][  T239]        woken_wake_function (kernel/sched/wait.c:464)
[   22.651573][  T239]        __wake_up_common (kernel/sched/wait.c:109)
[   22.651595][  T239]        __wake_up_common_lock (include/linux/spinlock.h:407 kernel/sched/wait.c:127)
[   22.651633][  T239]        __wake_up (kernel/sched/wait.c:147)
[   22.651653][  T239]        tty_wakeup (drivers/tty/tty_io.c:520)
[   22.651674][  T239]        n_tty_check_unthrottle (drivers/tty/n_tty.c:262)
[   22.651699][  T239]        n_tty_read (drivers/tty/n_tty.c:2279)
[   22.651723][  T239]        iterate_tty_read (drivers/tty/tty_io.c:848)
[   22.651743][  T239]        tty_read (drivers/tty/tty_io.c:922)
[   22.651762][  T239]        vfs_read (fs/read_write.c:494 (discriminator 1) fs/read_write.c:574 (discriminator 1))
[   22.651789][  T239]        ksys_read (fs/read_write.c:718)
[   22.651813][  T239]        __ia32_sys_read (fs/read_write.c:724)
[   22.651837][  T239]        ia32_sys_call (kbuild/obj/consumer/x86_64-randconfig-2005-20250721/./arch/x86/include/generated/asm/syscalls_32.h:4)
[   22.651854][  T239]        do_int80_emulation (arch/x86/entry/syscall_32.c:83 arch/x86/entry/syscall_32.c:172)
[   22.651876][  T239]        asm_int80_emulation (arch/x86/include/asm/idtentry.h:569)
[   22.651894][  T239]
[   22.651894][  T239] -> #2 (&tty->write_wait){-...}-{3:3}:
[   22.651923][  T239]        validate_chain (kernel/locking/lockdep.c:3285 kernel/locking/lockdep.c:3908)
[   22.651942][  T239]        __lock_acquire (kernel/locking/lockdep.c:5237 (discriminator 1))
[   22.651961][  T239]        lock_acquire (kernel/locking/lockdep.c:470 kernel/locking/lockdep.c:5870)
[   22.651979][  T239]        _raw_spin_lock_irqsave (include/linux/spinlock_api_smp.h:133 kernel/locking/spinlock.c:162)
[   22.652007][  T239]        __wake_up_common_lock (kernel/sched/wait.c:125)
[   22.652028][  T239]        __wake_up (kernel/sched/wait.c:147)
[   22.652048][  T239]        tty_wakeup (drivers/tty/tty_io.c:520)
[   22.652067][  T239]        tty_port_default_wakeup (include/linux/tty_port.h:276 drivers/tty/tty_port.c:66)
[   22.652087][  T239]        tty_port_tty_wakeup (drivers/tty/tty_port.c:405)
[   22.652104][  T239]        uart_write_wakeup (drivers/tty/serial/serial_core.c:122)
[   22.652129][  T239]        serial8250_tx_chars (drivers/tty/serial/8250/8250_port.c:1726)
[   22.652156][  T239]        serial8250_handle_irq (drivers/tty/serial/8250/8250_port.c:1827)
[   22.652183][  T239]        serial8250_default_handle_irq (drivers/tty/serial/8250/8250.h:182 (discriminator 1) drivers/tty/serial/8250/8250_port.c:1843 (discriminator 1))
[   22.652210][  T239]        serial8250_interrupt (drivers/tty/serial/8250/8250_core.c:86 (discriminator 1))
[   22.652231][  T239]        __handle_irq_event_percpu (kernel/irq/handle.c:209)
[   22.652258][  T239]        handle_irq_event_percpu (kernel/irq/handle.c:248)
[   22.652284][  T239]        handle_irq_event (kernel/irq/handle.c:265)
[   22.652310][  T239]        handle_edge_irq (kernel/irq/chip.c:857)
[   22.652330][  T239]        __common_interrupt (include/linux/irqdesc.h:187 arch/x86/kernel/irq.c:262 arch/x86/kernel/irq.c:318 arch/x86/kernel/irq.c:333)
[   22.652353][  T239]        common_interrupt (arch/x86/kernel/irq.c:326 (discriminator 35))
[   22.652375][  T239]        asm_common_interrupt (arch/x86/include/asm/idtentry.h:569)
[   22.652392][  T239]        _raw_spin_unlock_irqrestore (include/linux/spinlock_api_smp.h:179 (discriminator 1) kernel/locking/spinlock.c:194 (discriminator 1))
[   22.652409][  T239]        uart_port_unlock_irqrestore (include/linux/serial_core.h:789)
[   22.652436][  T239]        uart_port_unlock_deref (drivers/tty/serial/serial_core.c:92)
[   22.652462][  T239]        uart_write (drivers/tty/serial/serial_core.c:635)
[   22.652479][  T239]        process_output_block (drivers/tty/n_tty.c:557)
[   22.652502][  T239]        n_tty_write (drivers/tty/n_tty.c:2367)
[   22.652526][  T239]        iterate_tty_write (drivers/tty/tty_io.c:1007)
[   22.652548][  T239]        file_tty_write+0x240/0x280
[   22.652570][  T239]        tty_write (drivers/tty/tty_io.c:1103)
[   22.652591][  T239]        vfs_write (fs/read_write.c:596 (discriminator 1) fs/read_write.c:688 (discriminator 1))
[   22.652615][  T239]        ksys_write (fs/read_write.c:741)
[   22.652639][  T239]        __ia32_sys_write (fs/read_write.c:748)
[   22.652664][  T239]        ia32_sys_call (kbuild/obj/consumer/x86_64-randconfig-2005-20250721/./arch/x86/include/generated/asm/syscalls_32.h:5)
[   22.652680][  T239]        do_int80_emulation (arch/x86/entry/syscall_32.c:83 arch/x86/entry/syscall_32.c:172)
[   22.652701][  T239]        asm_int80_emulation (arch/x86/include/asm/idtentry.h:569)
[   22.652718][  T239]
[   22.652718][  T239] -> #1 (&port_lock_key){-.-.}-{3:3}:
[   22.652746][  T239]        validate_chain (kernel/locking/lockdep.c:3285 kernel/locking/lockdep.c:3908)
[   22.652765][  T239]        __lock_acquire (kernel/locking/lockdep.c:5237 (discriminator 1))
[   22.652784][  T239]        lock_acquire (kernel/locking/lockdep.c:470 kernel/locking/lockdep.c:5870)
[   22.652802][  T239]        _raw_spin_lock_irqsave (include/linux/spinlock_api_smp.h:133 kernel/locking/spinlock.c:162)
[   22.652830][  T239]        uart_port_lock_irqsave (include/linux/serial_core.h:717 (discriminator 2))
[   22.652853][  T239]        serial8250_console_write (drivers/tty/serial/8250/8250_port.c:3294)
[   22.652870][  T239]        univ8250_console_write (drivers/tty/serial/8250/8250_core.c:399)
[   22.652891][  T239]        console_emit_next_record (kernel/printk/printk.c:3100 (discriminator 1) kernel/printk/printk.c:3184 (discriminator 1))
[   22.652911][  T239]        console_flush_all (kernel/printk/printk.c:3270 kernel/printk/printk.c:3343)
[   22.652929][  T239]        console_unlock (kernel/printk/printk.c:3374 kernel/printk/printk.c:3413)
[   22.652947][  T239]        vprintk_emit (kernel/printk/printk.c:2480)
[   22.652965][  T239]        vprintk_default (kernel/printk/printk.c:2495)
[   22.652984][  T239]        vprintk (kernel/printk/printk_safe.c:83)
[   22.653003][  T239]        _printk (kernel/printk/printk.c:2499)
[   22.653025][  T239]        register_console (kernel/printk/printk.c:4225)
[   22.653044][  T239]        univ8250_console_init (drivers/tty/serial/8250/8250_core.c:516)
[   22.653070][  T239]        console_init (arch/x86/include/asm/atomic.h:23 include/linux/atomic/atomic-arch-fallback.h:457 include/linux/jump_label.h:262 include/trace/events/initcall.h:48 kernel/printk/printk.c:4424)
[   22.653094][  T239]        start_kernel (init/main.c:1148)
[   22.653110][  T239]        x86_64_start_reservations (arch/x86/kernel/head64.c:310)
[   22.653131][  T239]        x86_64_start_kernel (??:?)
[   22.653152][  T239]        common_startup_64 (arch/x86/kernel/head_64.S:419)
[   22.653177][  T239]
[   22.653177][  T239] -> #0 (console_owner){..-.}-{0:0}:
[   22.653205][  T239]        check_noncircular (kernel/locking/lockdep.c:2179)
[   22.653224][  T239]        check_prev_add (kernel/locking/lockdep.c:3166 (discriminator 2))
[   22.653242][  T239]        validate_chain (kernel/locking/lockdep.c:3285 kernel/locking/lockdep.c:3908)
[   22.653260][  T239]        __lock_acquire (kernel/locking/lockdep.c:5237 (discriminator 1))
[   22.653279][  T239]        lock_acquire (kernel/locking/lockdep.c:470 kernel/locking/lockdep.c:5870)
[   22.653297][  T239]        console_lock_spinning_enable (kernel/printk/printk.c:1903)
[   22.653316][  T239]        console_emit_next_record (kernel/printk/printk.c:3180)
[   22.653336][  T239]        console_flush_all (kernel/printk/printk.c:3270 kernel/printk/printk.c:3343)
[   22.653354][  T239]        console_unlock (kernel/printk/printk.c:3374 kernel/printk/printk.c:3413)
[   22.653372][  T239]        vprintk_emit (kernel/printk/printk.c:2480)
[   22.653390][  T239]        vprintk_default (kernel/printk/printk.c:2495)
[   22.653409][  T239]        vprintk (kernel/printk/printk_safe.c:83)
[   22.653427][  T239]        _printk (kernel/printk/printk.c:2499)
[   22.653450][  T239]        __report_bug (lib/bug.c:244)
[   22.653472][  T239]        report_bug (include/linux/context_tracking.h:159 lib/bug.c:282)
[   22.653493][  T239]        handle_bug (arch/x86/kernel/traps.c:435)
[   22.653513][  T239]        exc_invalid_op (arch/x86/kernel/traps.c:489 (discriminator 1))
[   22.653534][  T239]        asm_exc_invalid_op (arch/x86/include/asm/idtentry.h:569)
[   22.653551][  T239]        pick_task_fair (kernel/sched/fair.c:9022 (discriminator 1))
[   22.653577][  T239]        __pick_next_task+0x95/0x200
[   22.653600][  T239]        __schedule (kernel/sched/core.c:6887)
[   22.653621][  T239]        schedule (kernel/sched/core.c:7028 kernel/sched/core.c:7042)
[   22.653641][  T239]        schedule_hrtimeout_range_clock (kernel/time/sleep_timeout.c:208)
[   22.653668][  T239]        schedule_hrtimeout_range (kernel/time/sleep_timeout.c:265)
[   22.653695][  T239]        ep_poll (fs/eventpoll.c:2027 (discriminator 2))
[   22.653714][  T239]        do_epoll_wait (fs/eventpoll.c:2461)
[   22.653732][  T239]        __do_sys_epoll_wait (fs/eventpoll.c:2466)
[   22.653751][  T239]        __ia32_sys_epoll_wait (fs/eventpoll.c:2464)
[   22.653770][  T239]        ia32_sys_call (kbuild/obj/consumer/x86_64-randconfig-2005-20250721/./arch/x86/include/generated/asm/syscalls_32.h:257)
[   22.653786][  T239]        do_int80_emulation (arch/x86/entry/syscall_32.c:83 arch/x86/entry/syscall_32.c:172)
[   22.653807][  T239]        asm_int80_emulation (arch/x86/include/asm/idtentry.h:569)
[   22.653824][  T239]
[   22.653824][  T239] other info that might help us debug this:
[   22.653824][  T239]
[   22.653830][  T239] Chain exists of:


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20260224/202602240818.6fd9e413-lkp@xxxxxxxxx



-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki