------------[ cut here ]------------ ====================================================== WARNING: possible circular locking dependency detected 6.11.0-rc4-next-20240822-syzkaller #0 Not tainted ------------------------------------------------------ swapper/0/0 is trying to acquire lock: ffffffff8e815218 ((console_sem).lock){-...}-{2:2}, at: down_trylock+0x20/0xa0 kernel/locking/semaphore.c:139 but task is already holding lock: ffff8880b903ea58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0xb0/0x140 kernel/sched/core.c:595 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&rq->__lock){-.-.}-{2:2}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825 _raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378 raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:587 raw_spin_rq_lock kernel/sched/sched.h:1488 [inline] task_rq_lock+0xc6/0x360 kernel/sched/core.c:689 cgroup_move_task+0x92/0x2d0 kernel/sched/psi.c:1161 css_set_move_task+0x72e/0x950 kernel/cgroup/cgroup.c:898 cgroup_post_fork+0x256/0x880 kernel/cgroup/cgroup.c:6690 copy_process+0x39e9/0x3d50 kernel/fork.c:2598 kernel_clone+0x226/0x8f0 kernel/fork.c:2784 user_mode_thread+0x132/0x1a0 kernel/fork.c:2862 rest_init+0x23/0x300 init/main.c:712 start_kernel+0x47f/0x500 init/main.c:1105 x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:507 x86_64_start_kernel+0x9f/0xa0 arch/x86/kernel/head64.c:488 common_startup_64+0x13e/0x147 -> #1 (&p->pi_lock){-.-.}-{2:2}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162 class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:551 [inline] try_to_wake_up+0xb0/0x1480 kernel/sched/core.c:4150 up+0x72/0x90 kernel/locking/semaphore.c:191 __up_console_sem kernel/printk/printk.c:342 [inline] __console_unlock kernel/printk/printk.c:2828 [inline] console_unlock+0x22f/0x4d0 kernel/printk/printk.c:3155 vprintk_emit+0x87d/0xa10 kernel/printk/printk.c:2399 dev_vprintk_emit+0x2ae/0x330 drivers/base/core.c:4921 dev_printk_emit+0xdd/0x120 drivers/base/core.c:4932 _dev_notice+0x122/0x170 drivers/base/core.c:4989 usb_parse_endpoint drivers/usb/core/config.c:454 [inline] usb_parse_interface drivers/usb/core/config.c:594 [inline] usb_parse_configuration drivers/usb/core/config.c:807 [inline] usb_get_configuration+0x2d01/0x4dc0 drivers/usb/core/config.c:956 usb_enumerate_device drivers/usb/core/hub.c:2483 [inline] usb_new_device+0x14a/0x19a0 drivers/usb/core/hub.c:2621 hub_port_connect drivers/usb/core/hub.c:5521 [inline] hub_port_connect_change drivers/usb/core/hub.c:5661 [inline] port_event drivers/usb/core/hub.c:5821 [inline] hub_event+0x2d6d/0x5150 drivers/usb/core/hub.c:5903 process_one_work kernel/workqueue.c:3232 [inline] process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3313 worker_thread+0x86d/0xd10 kernel/workqueue.c:3390 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 -> #0 ((console_sem).lock){-...}-{2:2}: check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904 __lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162 down_trylock+0x20/0xa0 kernel/locking/semaphore.c:139 __down_trylock_console_sem+0x109/0x250 kernel/printk/printk.c:325 console_trylock kernel/printk/printk.c:2811 [inline] console_trylock_spinning kernel/printk/printk.c:1985 [inline] vprintk_emit+0x4b2/0xa10 kernel/printk/printk.c:2398 _printk+0xd5/0x120 kernel/printk/printk.c:2424 __report_bug lib/bug.c:195 [inline] report_bug+0x346/0x500 lib/bug.c:219 handle_bug+0x60/0x90 arch/x86/kernel/traps.c:285 exc_invalid_op+0x1a/0x50 arch/x86/kernel/traps.c:309 asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:621 place_entity+0x463/0x520 kernel/sched/fair.c:5337 enqueue_entity+0x271/0x1920 kernel/sched/fair.c:5409 enqueue_task_fair+0x206/0xe30 kernel/sched/fair.c:6985 enqueue_task+0x1a5/0x300 kernel/sched/core.c:2014 activate_task kernel/sched/core.c:2056 [inline] ttwu_do_activate+0x1d1/0x7e0 kernel/sched/core.c:3665 ttwu_queue kernel/sched/core.c:3940 [inline] try_to_wake_up+0x8bc/0x1480 kernel/sched/core.c:4266 hrtimer_wakeup+0x62/0x80 kernel/time/hrtimer.c:1927 __run_hrtimer kernel/time/hrtimer.c:1691 [inline] __hrtimer_run_queues+0x59b/0xd50 kernel/time/hrtimer.c:1755 hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1817 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1026 [inline] __sysvec_apic_timer_interrupt+0x110/0x3f0 arch/x86/kernel/apic/apic.c:1043 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1037 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1037 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 native_irq_enable arch/x86/include/asm/irqflags.h:42 [inline] arch_local_irq_enable arch/x86/include/asm/irqflags.h:97 [inline] call_cpuidle kernel/sched/idle.c:146 [inline] cpuidle_idle_call kernel/sched/idle.c:230 [inline] do_idle+0x459/0x5d0 kernel/sched/idle.c:326 cpu_startup_entry+0x42/0x60 kernel/sched/idle.c:424 rest_init+0x2dc/0x300 init/main.c:747 start_kernel+0x47f/0x500 init/main.c:1105 x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:507 x86_64_start_kernel+0x9f/0xa0 arch/x86/kernel/head64.c:488 common_startup_64+0x13e/0x147 other info that might help us debug this: Chain exists of: (console_sem).lock --> &p->pi_lock --> &rq->__lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&rq->__lock); lock(&p->pi_lock); lock(&rq->__lock); lock((console_sem).lock); *** DEADLOCK *** 2 locks held by swapper/0/0: #0: ffff88801fbb8a18 (&p->pi_lock){-.-.}-{2:2}, at: class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:551 [inline] #0: ffff88801fbb8a18 (&p->pi_lock){-.-.}-{2:2}, at: try_to_wake_up+0xb0/0x1480 kernel/sched/core.c:4150 #1: ffff8880b903ea58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0xb0/0x140 kernel/sched/core.c:595 stack backtrace: CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.11.0-rc4-next-20240822-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2074 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2206 check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904 __lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162 down_trylock+0x20/0xa0 kernel/locking/semaphore.c:139 __down_trylock_console_sem+0x109/0x250 kernel/printk/printk.c:325 console_trylock kernel/printk/printk.c:2811 [inline] console_trylock_spinning kernel/printk/printk.c:1985 [inline] vprintk_emit+0x4b2/0xa10 kernel/printk/printk.c:2398 _printk+0xd5/0x120 kernel/printk/printk.c:2424 __report_bug lib/bug.c:195 [inline] report_bug+0x346/0x500 lib/bug.c:219 handle_bug+0x60/0x90 arch/x86/kernel/traps.c:285 exc_invalid_op+0x1a/0x50 arch/x86/kernel/traps.c:309 asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:621 RIP: 0010:place_entity+0x463/0x520 kernel/sched/fair.c:5337 Code: 27 48 83 c4 30 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc 48 8b 3c 24 4c 89 fe e8 77 14 00 00 48 89 04 24 e9 e0 fd ff ff 90 <0f> 0b 90 41 bd 01 00 00 00 e9 22 ff ff ff 89 d9 80 e1 07 38 c1 0f RSP: 0018:ffffc90000007a10 EFLAGS: 00010046 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000100000 RDX: 0000000000000400 RSI: ffff88801fbb8080 RDI: ffff88801fbb8100 RBP: dffffc0000000000 R08: ffff8880241b4487 R09: 1ffff11004836890 R10: dffffc0000000000 R11: ffffed1004836891 R12: 0000000093ab2a66 R13: 0000000000000000 R14: 0000000000000000 R15: ffff88801fbb8080 enqueue_entity+0x271/0x1920 kernel/sched/fair.c:5409 enqueue_task_fair+0x206/0xe30 kernel/sched/fair.c:6985 enqueue_task+0x1a5/0x300 kernel/sched/core.c:2014 activate_task kernel/sched/core.c:2056 [inline] ttwu_do_activate+0x1d1/0x7e0 kernel/sched/core.c:3665 ttwu_queue kernel/sched/core.c:3940 [inline] try_to_wake_up+0x8bc/0x1480 kernel/sched/core.c:4266 hrtimer_wakeup+0x62/0x80 kernel/time/hrtimer.c:1927 __run_hrtimer kernel/time/hrtimer.c:1691 [inline] __hrtimer_run_queues+0x59b/0xd50 kernel/time/hrtimer.c:1755 hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1817 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1026 [inline] __sysvec_apic_timer_interrupt+0x110/0x3f0 arch/x86/kernel/apic/apic.c:1043 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1037 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1037 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:native_irq_enable arch/x86/include/asm/irqflags.h:42 [inline] RIP: 0010:arch_local_irq_enable arch/x86/include/asm/irqflags.h:97 [inline] RIP: 0010:call_cpuidle kernel/sched/idle.c:146 [inline] RIP: 0010:cpuidle_idle_call kernel/sched/idle.c:230 [inline] RIP: 0010:do_idle+0x459/0x5d0 kernel/sched/idle.c:326 Code: 38 00 74 14 48 89 4c 24 20 48 8b 7c 24 20 e8 8e e3 92 00 48 8b 4c 24 20 48 c7 01 00 00 00 00 e8 9d 0f 32 00 fb be f0 ff ff ff <48> 8b 7c 24 18 e8 ad 78 35 07 f0 80 4b 02 20 48 8b 44 24 38 42 80 RSP: 0018:ffffffff8e607d80 EFLAGS: 00000282 RAX: 074633ab213fc200 RBX: ffffffff8e694640 RCX: ffffffff94f95903 RDX: dffffc0000000000 RSI: 00000000fffffff0 RDI: ffffffff8c609f20 RBP: ffffffff8e607eb8 R08: ffffffff901c12ef R09: 1ffffffff203825d R10: dffffc0000000000 R11: fffffbfff203825e R12: 1ffffffff1cc0fc6 R13: 1ffffffff1cd28c8 R14: 0000000000000000 R15: dffffc0000000000 cpu_startup_entry+0x42/0x60 kernel/sched/idle.c:424 rest_init+0x2dc/0x300 init/main.c:747 start_kernel+0x47f/0x500 init/main.c:1105 x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:507 x86_64_start_kernel+0x9f/0xa0 arch/x86/kernel/head64.c:488 common_startup_64+0x13e/0x147 WARNING: CPU: 0 PID: 0 at kernel/sched/fair.c:5337 place_entity+0x463/0x520 kernel/sched/fair.c:5337 Modules linked in: CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.11.0-rc4-next-20240822-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 RIP: 0010:place_entity+0x463/0x520 kernel/sched/fair.c:5337 Code: 27 48 83 c4 30 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc 48 8b 3c 24 4c 89 fe e8 77 14 00 00 48 89 04 24 e9 e0 fd ff ff 90 <0f> 0b 90 41 bd 01 00 00 00 e9 22 ff ff ff 89 d9 80 e1 07 38 c1 0f RSP: 0018:ffffc90000007a10 EFLAGS: 00010046 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000100000 RDX: 0000000000000400 RSI: ffff88801fbb8080 RDI: ffff88801fbb8100 RBP: dffffc0000000000 R08: ffff8880241b4487 R09: 1ffff11004836890 R10: dffffc0000000000 R11: ffffed1004836891 R12: 0000000093ab2a66 R13: 0000000000000000 R14: 0000000000000000 R15: ffff88801fbb8080 FS: 0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b32712ff8 CR3: 000000002ae3a000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: enqueue_entity+0x271/0x1920 kernel/sched/fair.c:5409 enqueue_task_fair+0x206/0xe30 kernel/sched/fair.c:6985 enqueue_task+0x1a5/0x300 kernel/sched/core.c:2014 activate_task kernel/sched/core.c:2056 [inline] ttwu_do_activate+0x1d1/0x7e0 kernel/sched/core.c:3665 ttwu_queue kernel/sched/core.c:3940 [inline] try_to_wake_up+0x8bc/0x1480 kernel/sched/core.c:4266 hrtimer_wakeup+0x62/0x80 kernel/time/hrtimer.c:1927 __run_hrtimer kernel/time/hrtimer.c:1691 [inline] __hrtimer_run_queues+0x59b/0xd50 kernel/time/hrtimer.c:1755 hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1817 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1026 [inline] __sysvec_apic_timer_interrupt+0x110/0x3f0 arch/x86/kernel/apic/apic.c:1043 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1037 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1037 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:native_irq_enable arch/x86/include/asm/irqflags.h:42 [inline] RIP: 0010:arch_local_irq_enable arch/x86/include/asm/irqflags.h:97 [inline] RIP: 0010:call_cpuidle kernel/sched/idle.c:146 [inline] RIP: 0010:cpuidle_idle_call kernel/sched/idle.c:230 [inline] RIP: 0010:do_idle+0x459/0x5d0 kernel/sched/idle.c:326 Code: 38 00 74 14 48 89 4c 24 20 48 8b 7c 24 20 e8 8e e3 92 00 48 8b 4c 24 20 48 c7 01 00 00 00 00 e8 9d 0f 32 00 fb be f0 ff ff ff <48> 8b 7c 24 18 e8 ad 78 35 07 f0 80 4b 02 20 48 8b 44 24 38 42 80 RSP: 0018:ffffffff8e607d80 EFLAGS: 00000282 RAX: 074633ab213fc200 RBX: ffffffff8e694640 RCX: ffffffff94f95903 RDX: dffffc0000000000 RSI: 00000000fffffff0 RDI: ffffffff8c609f20 RBP: ffffffff8e607eb8 R08: ffffffff901c12ef R09: 1ffffffff203825d R10: dffffc0000000000 R11: fffffbfff203825e R12: 1ffffffff1cc0fc6 R13: 1ffffffff1cd28c8 R14: 0000000000000000 R15: dffffc0000000000 cpu_startup_entry+0x42/0x60 kernel/sched/idle.c:424 rest_init+0x2dc/0x300 init/main.c:747 start_kernel+0x47f/0x500 init/main.c:1105 x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:507 x86_64_start_kernel+0x9f/0xa0 arch/x86/kernel/head64.c:488 common_startup_64+0x13e/0x147 ---------------- Code disassembly (best guess): 0: 38 00 cmp %al,(%rax) 2: 74 14 je 0x18 4: 48 89 4c 24 20 mov %rcx,0x20(%rsp) 9: 48 8b 7c 24 20 mov 0x20(%rsp),%rdi e: e8 8e e3 92 00 call 0x92e3a1 13: 48 8b 4c 24 20 mov 0x20(%rsp),%rcx 18: 48 c7 01 00 00 00 00 movq $0x0,(%rcx) 1f: e8 9d 0f 32 00 call 0x320fc1 24: fb sti 25: be f0 ff ff ff mov $0xfffffff0,%esi * 2a: 48 8b 7c 24 18 mov 0x18(%rsp),%rdi <-- trapping instruction 2f: e8 ad 78 35 07 call 0x73578e1 34: f0 80 4b 02 20 lock orb $0x20,0x2(%rbx) 39: 48 8b 44 24 38 mov 0x38(%rsp),%rax 3e: 42 rex.X 3f: 80 .byte 0x80