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Thu, 26 Feb 2026 12:43:03 +0000 Date: Thu, 26 Feb 2026 20:42:55 +0800 From: kernel test robot To: CC: , , Subject: [thomas-weissschuh:b4/auxclock-nanosleep] aafb55d8d1: WARNING:possible_circular_locking_dependency_detected Message-ID: <202602262005.2ceb43cb-lkp@intel.com> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline User-Agent: s-nail v14.9.25 X-ClientProxiedBy: SG2PR02CA0138.apcprd02.prod.outlook.com (2603:1096:4:188::12) To LV3PR11MB8603.namprd11.prod.outlook.com (2603:10b6:408:1b6::9) Precedence: bulk X-Mailing-List: oe-lkp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: LV3PR11MB8603:EE_|SJ5PPFF9DAC6756:EE_ X-MS-Office365-Filtering-Correlation-Id: 0cb3209d-19f9-404b-04ce-08de753494ca X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|376014; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:LV3PR11MB8603.namprd11.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(1800799024)(366016)(376014);DIR:OUT;SFP:1101; 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[ 10.365221][ T1] [ 10.365221][ T1] but task is already holding lock: [ 10.365973][ T1] c2bb2f60 (&port_lock_key){-...}-{3:3}, at: uart_port_ref_lock (include/linux/serial_core.h:717) [ 10.366865][ T1] [ 10.366865][ T1] which lock already depends on the new lock. [ 10.366865][ T1] [ 10.367927][ T1] [ 10.367927][ T1] the existing dependency chain (in reverse order) is: [ 10.368840][ T1] [ 10.368840][ T1] -> #3 (&port_lock_key){-...}-{3:3}: [ 10.369608][ T1] _raw_spin_lock_irqsave (include/linux/spinlock_api_smp.h:132 kernel/locking/spinlock.c:162) [ 10.370198][ T1] serial8250_console_write (include/linux/serial_core.h:?) [ 10.370820][ T1] univ8250_console_write (drivers/tty/serial/8250/8250_core.c:399) [ 10.371411][ T1] console_flush_all (kernel/printk/printk.c:3184) [ 10.371971][ T1] console_unlock (kernel/printk/printk.c:3373 kernel/printk/printk.c:3413) [ 10.372495][ T1] vprintk_emit (arch/x86/include/asm/preempt.h:95 kernel/printk/printk.c:2480) [ 10.373004][ T1] vprintk_default (kernel/printk/printk.c:2494) [ 10.373530][ T1] vprintk (kernel/printk/printk_safe.c:82) [ 10.373977][ T1] _printk (kernel/printk/printk.c:2507) [ 10.374439][ T1] register_console (kernel/printk/printk.c:4208) [ 10.375012][ T1] univ8250_console_init (drivers/tty/serial/8250/8250_core.c:?) [ 10.375596][ T1] console_init (arch/x86/include/asm/jump_label.h:37 include/trace/events/initcall.h:48 kernel/printk/printk.c:4408) [ 10.376115][ T1] start_kernel (init/main.c:1148) [ 10.376640][ T1] i386_start_kernel (arch/x86/kernel/head32.c:79) [ 10.377194][ T1] startup_32_smp (arch/x86/kernel/head_32.S:293) [ 10.377730][ T1] [ 10.377730][ T1] -> #2 (console_owner){-...}-{0:0}: [ 10.378500][ T1] console_lock_spinning_enable (kernel/printk/printk.c:1902) [ 10.379156][ T1] console_flush_all (kernel/printk/printk.c:3182) [ 10.379720][ T1] console_unlock (kernel/printk/printk.c:3373 kernel/printk/printk.c:3413) [ 10.380242][ T1] vprintk_emit (arch/x86/include/asm/preempt.h:95 kernel/printk/printk.c:2480) [ 10.380756][ T1] vprintk_default (kernel/printk/printk.c:2494) [ 10.381294][ T1] vprintk (kernel/printk/printk_safe.c:82) [ 10.381739][ T1] _printk (kernel/printk/printk.c:2507) [ 10.382203][ T1] __hrtimer_run_queues (kernel/time/hrtimer.c:1826) [ 10.382783][ T1] hrtimer_run_queues (kernel/time/hrtimer.c:2011) [ 10.389262][ T1] update_process_times (kernel/time/timer.c:2455) [ 10.389835][ T1] tick_periodic (kernel/time/tick-common.c:102) [ 10.390358][ T1] tick_handle_periodic (include/linux/clockchips.h:152 kernel/time/tick-common.c:123) [ 10.390985][ T1] __sysvec_apic_timer_interrupt (arch/x86/include/asm/jump_label.h:37 arch/x86/include/asm/trace/irq_vectors.h:40 arch/x86/kernel/apic/apic.c:1063) [ 10.391674][ T1] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1056 arch/x86/kernel/apic/apic.c:1056) [ 10.392321][ T1] handle_exception_return (arch/x86/entry/entry_32.S:1055) [ 10.392917][ T1] seqcount_lockdep_reader_access (arch/x86/include/asm/irqflags.h:158) [ 10.393582][ T1] d_alloc_parallel (include/linux/seqlock.h:228) [ 10.394144][ T1] __lookup_slow (include/linux/err.h:78) [ 10.394714][ T1] lookup_slow (fs/namei.c:1933) [ 10.395229][ T1] path_lookupat (fs/namei.c:2279) [ 10.395758][ T1] filename_lookup (fs/namei.c:2833) [ 10.396308][ T1] kern_path (fs/namei.c:3040) [ 10.396795][ T1] init_stat (fs/init.c:149) [ 10.397286][ T1] clean_path (init/initramfs.c:337) [ 10.397776][ T1] do_name (init/initramfs.c:379) [ 10.398256][ T1] flush_buffer (init/initramfs.c:470 init/initramfs.c:482) [ 10.398827][ T1] __gunzip (lib/decompress_inflate.c:161) [ 10.399345][ T1] gunzip (lib/decompress_inflate.c:207) [ 10.399806][ T1] unpack_to_rootfs (init/initramfs.c:551) [ 10.400380][ T1] do_populate_rootfs (init/initramfs.c:734) [ 10.400958][ T1] async_run_entry_fn (kernel/async.c:136) [ 10.401540][ T1] process_one_work (kernel/workqueue.c:3280) [ 10.402107][ T1] worker_thread (kernel/workqueue.c:3352 kernel/workqueue.c:3439) [ 10.402695][ T1] kthread (kernel/kthread.c:469) [ 10.403191][ T1] ret_from_fork (arch/x86/kernel/process.c:164) [ 10.403729][ T1] ret_from_fork_asm (arch/x86/entry/entry_32.S:737) [ 10.404302][ T1] restore_all_switch_stack (arch/x86/entry/entry_32.S:945) [ 10.404940][ T1] [ 10.404940][ T1] -> #1 (hrtimer_bases.lock){-.-.}-{2:2}: [ 10.405824][ T1] _raw_spin_lock_irqsave (include/linux/spinlock_api_smp.h:132 kernel/locking/spinlock.c:162) [ 10.406472][ T1] hrtimer_start_range_ns (kernel/time/hrtimer.c:? kernel/time/hrtimer.c:1328) [ 10.407214][ T1] rpm_suspend (drivers/base/power/runtime.c:632) [ 10.407794][ T1] rpm_idle (drivers/base/power/runtime.c:562) [ 10.408341][ T1] __pm_runtime_idle (drivers/base/power/runtime.c:1129) [ 10.408952][ T1] device_release_driver_internal (drivers/base/dd.c:567) [ 10.409668][ T1] device_release_driver (drivers/base/dd.c:1331) [ 10.410252][ T1] bus_remove_device (drivers/base/bus.c:?) [ 10.410868][ T1] device_del (drivers/base/power/power.h:142 drivers/base/core.c:3879) [ 10.411397][ T1] serial_base_port_device_remove (drivers/tty/serial/serial_base_bus.c:211) [ 10.412070][ T1] serial_core_unregister_port (drivers/tty/serial/serial_core.c:3232) [ 10.412731][ T1] serial_ctrl_unregister_port (drivers/tty/serial/serial_ctrl.c:47) [ 10.413365][ T1] uart_remove_one_port (drivers/tty/serial/serial_port.c:150) [ 10.413932][ T1] serial8250_register_8250_port (drivers/tty/serial/8250/8250_core.c:722) [ 10.414658][ T1] serial8250_probe (drivers/tty/serial/8250/8250_platform.c:195 drivers/tty/serial/8250/8250_platform.c:217) [ 10.415233][ T1] platform_probe (drivers/base/platform.c:?) [ 10.415762][ T1] really_probe (drivers/base/dd.c:?) [ 10.416293][ T1] __driver_probe_device (drivers/base/dd.c:803) [ 10.416890][ T1] driver_probe_device (drivers/base/dd.c:833) [ 10.417472][ T1] __device_attach_driver (drivers/base/dd.c:962) [ 10.418086][ T1] bus_for_each_drv (drivers/base/bus.c:500) [ 10.418679][ T1] __device_attach (drivers/base/dd.c:1033) [ 10.419232][ T1] device_initial_probe (drivers/base/dd.c:?) [ 10.419819][ T1] bus_probe_device (drivers/base/bus.c:576) [ 10.420374][ T1] device_add (drivers/base/core.c:3696) [ 10.420888][ T1] platform_device_add (drivers/base/platform.c:757) [ 10.421475][ T1] platform_device_register (drivers/base/platform.c:820) [ 10.422094][ T1] hub6_init (drivers/tty/serial/8250/8250_hub6.c:46) [ 10.422568][ T1] do_one_initcall (init/main.c:1382) [ 10.423164][ T1] do_initcall_level (init/main.c:1443) [ 10.423734][ T1] do_initcalls (init/main.c:1457) [ 10.424247][ T1] do_basic_setup (init/main.c:1480) [ 10.424778][ T1] kernel_init_freeable (init/main.c:1694) [ 10.425372][ T1] kernel_init (init/main.c:1584) [ 10.425879][ T1] ret_from_fork (arch/x86/kernel/process.c:164) [ 10.426419][ T1] ret_from_fork_asm (arch/x86/entry/entry_32.S:737) [ 10.427374][ T1] restore_all_switch_stack (arch/x86/entry/entry_32.S:945) [ 10.427978][ T1] [ 10.427978][ T1] -> #0 (&dev->power.lock){....}-{3:3}: [ 10.428776][ T1] __lock_acquire (kernel/locking/lockdep.c:?) [ 10.429353][ T1] lock_acquire (kernel/locking/lockdep.c:5868) [ 10.429881][ T1] _raw_spin_lock_irqsave (include/linux/spinlock_api_smp.h:132 kernel/locking/spinlock.c:162) [ 10.430515][ T1] __pm_runtime_resume (drivers/base/power/runtime.c:?) [ 10.431200][ T1] __uart_start (drivers/tty/serial/serial_core.c:150) [ 10.431855][ T1] uart_write (drivers/tty/serial/serial_core.c:634) [ 10.432366][ T1] n_tty_write (drivers/tty/n_tty.c:557 drivers/tty/n_tty.c:2366) [ 10.432910][ T1] file_tty_write (drivers/tty/tty_io.c:1006) [ 10.433445][ T1] redirected_tty_write (drivers/tty/tty_io.c:1126) [ 10.434006][ T1] do_iter_readv_writev (fs/read_write.c:830) [ 10.434582][ T1] vfs_writev (fs/read_write.c:1059) [ 10.435151][ T1] do_writev (fs/read_write.c:1105) [ 10.435641][ T1] __ia32_sys_writev (fs/read_write.c:1173 fs/read_write.c:1170 fs/read_write.c:1170) [ 10.436175][ T1] ia32_sys_call (kbuild/obj/consumer/i386-randconfig-054-20260223/./arch/x86/include/generated/asm/syscalls_32.h:170) [ 10.436701][ T1] __do_fast_syscall_32 (arch/x86/entry/syscall_32.c:?) [ 10.437261][ T1] do_fast_syscall_32 (arch/x86/entry/syscall_32.c:332) [ 10.437789][ T1] do_SYSENTER_32 (arch/x86/entry/syscall_32.c:370) [ 10.438299][ T1] entry_SYSENTER_32 (arch/x86/entry/entry_32.S:836) [ 10.438877][ T1] [ 10.438877][ T1] other info that might help us debug this: [ 10.438877][ T1] [ 10.439628][ T1] Chain exists of: [ 10.439628][ T1] &dev->power.lock --> console_owner --> &port_lock_key [ 10.439628][ T1] [ 10.440511][ T1] Possible unsafe locking scenario: [ 10.440511][ T1] [ 10.441017][ T1] CPU0 CPU1 [ 10.441381][ T1] ---- ---- [ 10.441746][ T1] lock(&port_lock_key); [ 10.442043][ T1] lock(console_owner); [ 10.442498][ T1] lock(&port_lock_key); [ 10.443006][ T1] lock(&dev->power.lock); [ 10.443320][ T1] [ 10.443320][ T1] *** DEADLOCK *** [ 10.443320][ T1] [ 10.443878][ T1] 5 locks held by systemd/1: [ 10.444194][ T1] #0: c4177058 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait (drivers/tty/tty_ldisc.c:244) [ 10.444811][ T1] #1: c41770a0 (&tty->atomic_write_lock){+.+.}-{4:4}, at: file_tty_write (drivers/tty/tty_io.c:939) [ 10.445450][ T1] #2: c417717c (&tty->termios_rwsem){++++}-{4:4}, at: n_tty_write (drivers/tty/n_tty.c:759 drivers/tty/n_tty.c:2352) [ 10.446049][ T1] #3: f7c192d8 (&ldata->output_lock){+.+.}-{4:4}, at: n_tty_write (drivers/tty/n_tty.c:515 drivers/tty/n_tty.c:2366) [ 10.446663][ T1] #4: c2bb2f60 (&port_lock_key){-...}-{3:3}, at: uart_port_ref_lock (include/linux/serial_core.h:717) The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20260226/202602262005.2ceb43cb-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki