rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...!: (1 GPs behind) idle=0b14/1/0x4000000000000000 softirq=35074/35077 fqs=0 (detected by 0, t=10505 jiffies, g=44905, q=174 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 22 Comm: kworker/1:0 Tainted: G W 6.1.120-syzkaller-00773-g52f863f820fd #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/25/2024 Workqueue: usb_hub_wq hub_event RIP: 0010:validate_chain+0x0/0x5950 kernel/locking/lockdep.c:3781 Code: c1 f8 3a 9b 8e 80 e1 07 80 c1 03 38 c1 7c 92 48 c7 c7 f8 3a 9b 8e e8 7f c8 76 00 eb 84 e8 e8 d6 46 09 0f 1f 84 00 00 00 00 00 <55> 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48 81 ec 80 02 RSP: 0018:ffffc900001e0a58 EFLAGS: 00000086 RAX: 1ffffffff218eb34 RBX: ffffffff90c759a0 RCX: 166f2263bf7765c1 RDX: 0000000000000001 RSI: ffff888018c64728 RDI: ffff888018c63b80 RBP: 166f2263bf7765c1 R08: dffffc0000000000 R09: fffffbfff2249c82 R10: 0000000000000000 R11: dffffc0000000001 R12: ffff888018c64658 R13: ffff888018c63b80 R14: 0000000000000001 R15: 1ffff1100318c8e9 FS: 0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb14d6a56c0 CR3: 00000000775d1000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] advance_sched+0x47/0x970 net/sched/sch_taprio.c:700 __run_hrtimer kernel/time/hrtimer.c:1689 [inline] __hrtimer_run_queues+0x5e5/0xe50 kernel/time/hrtimer.c:1753 hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1815 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline] __sysvec_apic_timer_interrupt+0x158/0x5b0 arch/x86/kernel/apic/apic.c:1124 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline] sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1118 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 RIP: 0010:console_emit_next_record+0xd67/0x1000 kernel/printk/printk.c:2786 Code: f8 1b 00 44 0f b6 74 24 1f 48 83 7c 24 30 00 75 07 e8 2d f8 1b 00 eb 06 e8 26 f8 1b 00 fb 48 c7 84 24 a0 00 00 00 0e 36 e0 45 <43> c7 04 2c 00 00 00 00 4b c7 44 2c 0a 00 00 00 00 4b c7 44 2c 12 RSP: 0018:ffffc900001c6ae0 EFLAGS: 00000287 RAX: ffffffff816ea44a RBX: ffffffff816ea18c RCX: 0000000000100000 RDX: ffffc9001c3a6000 RSI: 000000000000e07d RDI: 000000000000e07e RBP: ffffc900001c6d90 R08: ffffffff816ea422 R09: fffffbfff2249c4d R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000 R13: 1ffff92000038d70 R14: 0000000000000001 R15: 0000000000000000 console_unlock+0x278/0x7c0 kernel/printk/printk.c:2906 vprintk_emit+0x523/0x740 kernel/printk/printk.c:2303 dev_vprintk_emit+0x2aa/0x323 drivers/base/core.c:4932 dev_printk_emit+0xd9/0x118 drivers/base/core.c:4943 _dev_warn+0x11e/0x165 drivers/base/core.c:4999 usb_set_configuration+0x1e3b/0x2020 drivers/usb/core/message.c:1980 usb_generic_driver_probe+0x84/0x140 drivers/usb/core/generic.c:238 usb_probe_device+0x130/0x260 drivers/usb/core/driver.c:293 really_probe+0x2ab/0xcb0 drivers/base/dd.c:639 __driver_probe_device+0x1a2/0x3d0 drivers/base/dd.c:785 driver_probe_device+0x50/0x420 drivers/base/dd.c:815 __device_attach_driver+0x2cf/0x510 drivers/base/dd.c:943 bus_for_each_drv+0x183/0x200 drivers/base/bus.c:429 __device_attach+0x359/0x570 drivers/base/dd.c:1015 bus_probe_device+0xba/0x1e0 drivers/base/bus.c:489 device_add+0xb48/0xfd0 drivers/base/core.c:3696 usb_new_device+0xbdd/0x18f0 drivers/usb/core/hub.c:2620 hub_port_connect drivers/usb/core/hub.c:5477 [inline] hub_port_connect_change drivers/usb/core/hub.c:5617 [inline] port_event drivers/usb/core/hub.c:5773 [inline] hub_event+0x2efe/0x5730 drivers/usb/core/hub.c:5855 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 rcu: rcu_preempt kthread starved for 10505 jiffies! g44905 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: task:rcu_preempt state:R running task stack:27064 pid:16 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5241 [inline] __schedule+0x143f/0x4570 kernel/sched/core.c:6558 schedule+0xbf/0x180 kernel/sched/core.c:6634 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1965 rcu_gp_fqs_loop+0x2d2/0x1150 kernel/rcu/tree.c:1706 rcu_gp_kthread+0xa3/0x3b0 kernel/rcu/tree.c:1905 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 rcu: Stack dump where RCU GP kthread last ran: CPU: 0 PID: 5080 Comm: kworker/u4:8 Tainted: G W 6.1.120-syzkaller-00773-g52f863f820fd #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/25/2024 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:424 [inline] RIP: 0010:smp_call_function_many_cond+0x1fae/0x3460 kernel/smp.c:998 Code: 2f 44 89 ee 83 e6 01 31 ff e8 0e 44 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 0a e8 99 40 0b 00 e9 1b ff ff ff f3 90 <42> 0f b6 04 2b 84 c0 75 14 41 f7 07 01 00 00 00 0f 84 fe fe ff ff RSP: 0018:ffffc900034975a0 EFLAGS: 00000293 RAX: ffffffff817f5bf9 RBX: 1ffff110171e81b1 RCX: ffff88802a79d940 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90003497980 R08: ffffffff817f5bc2 R09: fffffbfff2249c4d R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000800000000 R13: dffffc0000000000 R14: 0000000000000001 R15: ffff8880b8f40d88 FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555559946808 CR3: 000000000d08e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: on_each_cpu_cond_mask+0x3b/0x80 kernel/smp.c:1166 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:1334 [inline] text_poke_bp_batch+0x2bb/0x940 arch/x86/kernel/alternative.c:1534 text_poke_flush arch/x86/kernel/alternative.c:1725 [inline] text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1732 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146 static_key_enable_cpuslocked+0x12e/0x250 kernel/jump_label.c:207 static_key_enable+0x16/0x20 kernel/jump_label.c:220 toggle_allocation_gate+0xbf/0x480 mm/kfence/core.c:804 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 watchdog: BUG: soft lockup - CPU#0 stuck for 246s! [kworker/u4:8:5080] Modules linked in: irq event stamp: 6528838 hardirqs last enabled at (6528837): [] asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 hardirqs last disabled at (6528838): [] sysvec_apic_timer_interrupt+0xa/0xc0 arch/x86/kernel/apic/apic.c:1118 softirqs last enabled at (6451242): [] __do_softirq kernel/softirq.c:605 [inline] softirqs last enabled at (6451242): [] invoke_softirq kernel/softirq.c:445 [inline] softirqs last enabled at (6451242): [] __irq_exit_rcu+0x157/0x240 kernel/softirq.c:654 softirqs last disabled at (6451173): [] __do_softirq kernel/softirq.c:605 [inline] softirqs last disabled at (6451173): [] invoke_softirq kernel/softirq.c:445 [inline] softirqs last disabled at (6451173): [] __irq_exit_rcu+0x157/0x240 kernel/softirq.c:654 CPU: 0 PID: 5080 Comm: kworker/u4:8 Tainted: G W 6.1.120-syzkaller-00773-g52f863f820fd #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/25/2024 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:rep_nop arch/x86/include/asm/vdso/processor.h:13 [inline] RIP: 0010:cpu_relax arch/x86/include/asm/vdso/processor.h:18 [inline] RIP: 0010:csd_lock_wait kernel/smp.c:424 [inline] RIP: 0010:smp_call_function_many_cond+0x1fac/0x3460 kernel/smp.c:998 Code: 45 8b 2f 44 89 ee 83 e6 01 31 ff e8 0e 44 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 0a e8 99 40 0b 00 e9 1b ff ff ff 90 42 0f b6 04 2b 84 c0 75 14 41 f7 07 01 00 00 00 0f 84 fe fe RSP: 0018:ffffc900034975a0 EFLAGS: 00000293 RAX: ffffffff817f5bf9 RBX: 1ffff110171e81b1 RCX: ffff88802a79d940 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90003497980 R08: ffffffff817f5bc2 R09: fffffbfff2249c4d R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000800000000 R13: dffffc0000000000 R14: 0000000000000001 R15: ffff8880b8f40d88 FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555559946808 CR3: 000000000d08e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: on_each_cpu_cond_mask+0x3b/0x80 kernel/smp.c:1166 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:1334 [inline] text_poke_bp_batch+0x2bb/0x940 arch/x86/kernel/alternative.c:1534 text_poke_flush arch/x86/kernel/alternative.c:1725 [inline] text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1732 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146 static_key_enable_cpuslocked+0x12e/0x250 kernel/jump_label.c:207 static_key_enable+0x16/0x20 kernel/jump_label.c:220 toggle_allocation_gate+0xbf/0x480 mm/kfence/core.c:804 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 22 Comm: kworker/1:0 Tainted: G W 6.1.120-syzkaller-00773-g52f863f820fd #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/25/2024 Workqueue: usb_hub_wq hub_event RIP: 0010:lock_release+0x664/0xa20 kernel/locking/lockdep.c:5686 Code: 27 00 00 00 00 4b c7 44 27 08 00 00 00 00 65 48 8b 04 25 28 00 00 00 48 3b 84 24 e0 00 00 00 0f 85 5f 03 00 00 48 8d 65 d8 5b <41> 5c 41 5d 41 5e 41 5f 5d c3 0f 0b e9 37 fa ff ff 0f 0b 48 c7 c7 RSP: 0018:ffffc900001e0c90 EFLAGS: 00000046 RAX: 89d2700c7159a900 RBX: ffff8880b8f2a4c0 RCX: ffffc900001e0c03 RDX: 0000000000000005 RSI: ffffffff8b0c14e0 RDI: ffffffff8b5e6500 RBP: ffffc900001e0cb0 R08: dffffc0000000000 R09: fffffbfff1d360c6 R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff9200003c17c R13: 0000000000000046 R14: ffffc900001e0c10 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb14d6a56c0 CR3: 00000000775d1000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:149 [inline] _raw_spin_unlock_irqrestore+0x75/0x130 kernel/locking/spinlock.c:194 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x4b0/0xe50 kernel/time/hrtimer.c:1753 hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1815 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline] __sysvec_apic_timer_interrupt+0x158/0x5b0 arch/x86/kernel/apic/apic.c:1124 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline] sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1118 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 RIP: 0010:console_emit_next_record+0xd67/0x1000 kernel/printk/printk.c:2786 Code: f8 1b 00 44 0f b6 74 24 1f 48 83 7c 24 30 00 75 07 e8 2d f8 1b 00 eb 06 e8 26 f8 1b 00 fb 48 c7 84 24 a0 00 00 00 0e 36 e0 45 <43> c7 04 2c 00 00 00 00 4b c7 44 2c 0a 00 00 00 00 4b c7 44 2c 12 RSP: 0018:ffffc900001c6ae0 EFLAGS: 00000287 RAX: ffffffff816ea44a RBX: ffffffff816ea18c RCX: 0000000000100000 RDX: ffffc9001c3a6000 RSI: 000000000000e07d RDI: 000000000000e07e RBP: ffffc900001c6d90 R08: ffffffff816ea422 R09: fffffbfff2249c4d R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000 R13: 1ffff92000038d70 R14: 0000000000000001 R15: 0000000000000000 console_unlock+0x278/0x7c0 kernel/printk/printk.c:2906 vprintk_emit+0x523/0x740 kernel/printk/printk.c:2303 dev_vprintk_emit+0x2aa/0x323 drivers/base/core.c:4932 dev_printk_emit+0xd9/0x118 drivers/base/core.c:4943 _dev_warn+0x11e/0x165 drivers/base/core.c:4999 usb_set_configuration+0x1e3b/0x2020 drivers/usb/core/message.c:1980 usb_generic_driver_probe+0x84/0x140 drivers/usb/core/generic.c:238 usb_probe_device+0x130/0x260 drivers/usb/core/driver.c:293 really_probe+0x2ab/0xcb0 drivers/base/dd.c:639 __driver_probe_device+0x1a2/0x3d0 drivers/base/dd.c:785 driver_probe_device+0x50/0x420 drivers/base/dd.c:815 __device_attach_driver+0x2cf/0x510 drivers/base/dd.c:943 bus_for_each_drv+0x183/0x200 drivers/base/bus.c:429 __device_attach+0x359/0x570 drivers/base/dd.c:1015 bus_probe_device+0xba/0x1e0 drivers/base/bus.c:489 device_add+0xb48/0xfd0 drivers/base/core.c:3696 usb_new_device+0xbdd/0x18f0 drivers/usb/core/hub.c:2620 hub_port_connect drivers/usb/core/hub.c:5477 [inline] hub_port_connect_change drivers/usb/core/hub.c:5617 [inline] port_event drivers/usb/core/hub.c:5773 [inline] hub_event+0x2efe/0x5730 drivers/usb/core/hub.c:5855 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295