rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 ticks this GP) idle=8cdc/1/0x4000000000000000 softirq=24646/24646 fqs=0
rcu: 	(detected by 1, t=10502 jiffies, g=32597, q=217 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 8549 Comm: kworker/0:6 Not tainted 6.6.96-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: usb_hub_wq hub_event
RIP: 0010:check_preemption_disabled+0x18/0x110 lib/smp_processor_id.c:14
Code: e0 6c fc 8a eb 0c 66 2e 0f 1f 84 00 00 00 00 00 66 90 55 41 57 41 56 53 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 44 24 08 <65> 8b 05 cd 3c 95 75 65 8b 0d c2 3c 95 75 f7 c1 ff ff ff 7f 74 1f
RSP: 0018:ffffc90000007ae8 EFLAGS: 00000086
RAX: 71a4cc3114532600 RBX: 0000000000000000 RCX: ffffffff81677b2b
RDX: 0000000000000000 RSI: ffffffff8afc6ce0 RDI: ffffffff8afc6ca0
RBP: ffffc90000007c50 R08: ffffffff8e4a7faf R09: 1ffffffff1c94ff5
R10: dffffc0000000000 R11: fffffbfff1c94ff6 R12: ffffffff889d67a0
R13: dffffc0000000000 R14: 1856671a6d99c516 R15: 1ffff92000000f74
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000140 CR3: 0000000061f6e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 rcu_dynticks_curr_cpu_in_eqs include/linux/context_tracking.h:122 [inline]
 rcu_is_watching+0x15/0xb0 kernel/rcu/tree.c:700
 trace_lock_release include/trace/events/lock.h:69 [inline]
 lock_release+0xba/0x8b0 kernel/locking/lockdep.c:5765
 __raw_spin_unlock include/linux/spinlock_api_smp.h:141 [inline]
 _raw_spin_unlock+0x16/0x40 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 advance_sched+0x9a0/0xc80 net/sched/sch_taprio.c:992
 __run_hrtimer kernel/time/hrtimer.c:1755 [inline]
 __hrtimer_run_queues+0x51e/0xc40 kernel/time/hrtimer.c:1819
 hrtimer_interrupt+0x3c9/0x9c0 kernel/time/hrtimer.c:1881
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline]
 __sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:212
Code: 00 0f 0b 0f 1f 80 00 00 00 00 f3 0f 1e fa 53 48 89 fb e8 13 00 00 00 48 8b 3d 7c eb c4 0c 48 89 de 5b e9 43 de 57 00 cc cc cc <f3> 0f 1e fa 48 8b 04 24 65 48 8b 0d 90 23 7e 7e 65 8b 15 91 23 7e
RSP: 0018:ffffc900037befe8 EFLAGS: 00000286
RAX: ffffffff86510fe2 RBX: ffff888147268000 RCX: 0000000000100000
RDX: ffffc900172b9000 RSI: ffffffff8b52c3a0 RDI: ffff888147268000
RBP: 0000000000001120 R08: ffffffff90da5597 R09: 1ffffffff21b4ab2
R10: dffffc0000000000 R11: fffffbfff21b4ab3 R12: 000000000000166a
R13: ffffffff8b52b280 R14: ffffffff8b52c3a0 R15: ffff888147268000
 usb_match_one_id+0x1d/0x980 drivers/usb/core/driver.c:711
 usb_match_id drivers/usb/core/driver.c:816 [inline]
 usb_device_match+0x39d/0x540 drivers/usb/core/driver.c:890
 driver_match_device drivers/base/base.h:168 [inline]
 __device_attach_driver+0x86/0x520 drivers/base/dd.c:928
 bus_for_each_drv+0x24b/0x2d0 drivers/base/bus.c:459
 __device_attach+0x2b5/0x400 drivers/base/dd.c:1030
 bus_probe_device+0x180/0x260 drivers/base/bus.c:534
 device_add+0x85b/0xc20 drivers/base/core.c:3683
 usb_set_configuration+0x1a79/0x20c0 drivers/usb/core/message.c:2207
 usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:238
 usb_probe_device+0x13d/0x280 drivers/usb/core/driver.c:293
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x25b/0xb40 drivers/base/dd.c:658
 __driver_probe_device+0x18c/0x330 drivers/base/dd.c:800
 driver_probe_device+0x4f/0x420 drivers/base/dd.c:830
 __device_attach_driver+0x2ca/0x520 drivers/base/dd.c:958
 bus_for_each_drv+0x24b/0x2d0 drivers/base/bus.c:459
 __device_attach+0x2b5/0x400 drivers/base/dd.c:1030
 bus_probe_device+0x180/0x260 drivers/base/bus.c:534
 device_add+0x85b/0xc20 drivers/base/core.c:3683
 usb_new_device+0xa31/0x1630 drivers/usb/core/hub.c:2632
 hub_port_connect drivers/usb/core/hub.c:5501 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5641 [inline]
 port_event drivers/usb/core/hub.c:5801 [inline]
 hub_event+0x2957/0x49c0 drivers/usb/core/hub.c:5883
 process_one_work kernel/workqueue.c:2634 [inline]
 process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g32597 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=12052
rcu: rcu_preempt kthread starved for 10502 jiffies! g32597 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:26920 pid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5381 [inline]
 __schedule+0x14e2/0x4580 kernel/sched/core.c:6700
 schedule+0xbd/0x170 kernel/sched/core.c:6774
 schedule_timeout+0x160/0x280 kernel/time/timer.c:2167
 rcu_gp_fqs_loop+0x302/0x1560 kernel/rcu/tree.c:1667
 rcu_gp_kthread+0x99/0x380 kernel/rcu/tree.c:1866
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 8549 Comm: kworker/0:6 Not tainted 6.6.96-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: usb_hub_wq hub_event
RIP: 0010:enqueue_hrtimer+0x1/0x370 kernel/time/hrtimer.c:1112
Code: 5e 5d c3 66 0f 1f 44 00 00 f3 0f 1e fa e8 a7 bb 0f 00 bf aa 00 00 00 e9 0d 94 ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 55 <41> 57 41 56 41 55 41 54 53 89 d5 49 89 f6 48 89 fb 49 bc 00 00 00
RSP: 0018:ffffc90000007d30 EFLAGS: 00000046
RAX: ffffffff8175ae8a RBX: 0000000000000000 RCX: ffff8880239dbc00
RDX: 0000000000000000 RSI: ffff8880b8e2ba40 RDI: ffff88807e370340
RBP: ffffc90000007e90 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000000f84 R12: ffff88807e370340
R13: dffffc0000000000 R14: ffff8880b8e2ba98 R15: ffff8880b8e2ba40
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000140 CR3: 0000000061f6e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __run_hrtimer kernel/time/hrtimer.c:1772 [inline]
 __hrtimer_run_queues+0x637/0xc40 kernel/time/hrtimer.c:1819
 hrtimer_interrupt+0x3c9/0x9c0 kernel/time/hrtimer.c:1881
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline]
 __sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:212
Code: 00 0f 0b 0f 1f 80 00 00 00 00 f3 0f 1e fa 53 48 89 fb e8 13 00 00 00 48 8b 3d 7c eb c4 0c 48 89 de 5b e9 43 de 57 00 cc cc cc <f3> 0f 1e fa 48 8b 04 24 65 48 8b 0d 90 23 7e 7e 65 8b 15 91 23 7e
RSP: 0018:ffffc900037befe8 EFLAGS: 00000286
RAX: ffffffff86510fe2 RBX: ffff888147268000 RCX: 0000000000100000
RDX: ffffc900172b9000 RSI: ffffffff8b52c3a0 RDI: ffff888147268000
RBP: 0000000000001120 R08: ffffffff90da5597 R09: 1ffffffff21b4ab2
R10: dffffc0000000000 R11: fffffbfff21b4ab3 R12: 000000000000166a
R13: ffffffff8b52b280 R14: ffffffff8b52c3a0 R15: ffff888147268000
 usb_match_one_id+0x1d/0x980 drivers/usb/core/driver.c:711
 usb_match_id drivers/usb/core/driver.c:816 [inline]
 usb_device_match+0x39d/0x540 drivers/usb/core/driver.c:890
 driver_match_device drivers/base/base.h:168 [inline]
 __device_attach_driver+0x86/0x520 drivers/base/dd.c:928
 bus_for_each_drv+0x24b/0x2d0 drivers/base/bus.c:459
 __device_attach+0x2b5/0x400 drivers/base/dd.c:1030
 bus_probe_device+0x180/0x260 drivers/base/bus.c:534
 device_add+0x85b/0xc20 drivers/base/core.c:3683
 usb_set_configuration+0x1a79/0x20c0 drivers/usb/core/message.c:2207
 usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:238
 usb_probe_device+0x13d/0x280 drivers/usb/core/driver.c:293
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x25b/0xb40 drivers/base/dd.c:658
 __driver_probe_device+0x18c/0x330 drivers/base/dd.c:800
 driver_probe_device+0x4f/0x420 drivers/base/dd.c:830
 __device_attach_driver+0x2ca/0x520 drivers/base/dd.c:958
 bus_for_each_drv+0x24b/0x2d0 drivers/base/bus.c:459
 __device_attach+0x2b5/0x400 drivers/base/dd.c:1030
 bus_probe_device+0x180/0x260 drivers/base/bus.c:534
 device_add+0x85b/0xc20 drivers/base/core.c:3683
 usb_new_device+0xa31/0x1630 drivers/usb/core/hub.c:2632
 hub_port_connect drivers/usb/core/hub.c:5501 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5641 [inline]
 port_event drivers/usb/core/hub.c:5801 [inline]
 hub_event+0x2957/0x49c0 drivers/usb/core/hub.c:5883
 process_one_work kernel/workqueue.c:2634 [inline]
 process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>