rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-....: (8807 ticks this GP) idle=76ec/1/0x4000000000000000 softirq=18373/27057 fqs=11 rcu: hardirqs softirqs csw/system rcu: number: 3 220 4 rcu: cputime: 16979 4 1040 ==> 18050(ms) rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5131/1:b..l rcu: (detected by 0, t=10511 jiffies, g=18913, q=769 ncpus=2) Sending NMI from CPU 0 to CPUs 1: usb 4-1: pegasus_irq - nonzero urb status received: -71 NMI backtrace for cpu 1 CPU: 1 PID: 783 Comm: kworker/1:2 Not tainted 6.10.0-rc6-syzkaller-00163-g661e504db04c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Workqueue: events_power_efficient neigh_periodic_work RIP: 0010:serial8250_console_write+0x1a8/0x1770 drivers/tty/serial/8250/8250_port.c:3352 Code: 89 ff e8 1b 23 55 06 89 c3 31 ff 89 c6 e8 10 8f 5a fc 85 db 74 57 e8 c7 8a 5a fc eb 43 e8 c0 8a 5a fc 4c 89 ff e8 58 24 55 06 <48> 89 84 24 b0 00 00 00 c7 44 24 2c 00 00 00 00 e9 cc 00 00 00 e8 RSP: 0018:ffffc90000a174c0 EFLAGS: 00000046 RAX: 0000000000000046 RBX: 0000000000000000 RCX: 0000000000000001 RDX: dffffc0000000000 RSI: 0000000000000004 RDI: ffffc90000a173a0 RBP: ffffc90000a17690 R08: 0000000000000003 R09: fffff52000142e74 R10: dffffc0000000000 R11: fffff52000142e74 R12: dffffc0000000000 R13: ffffffff8eb21f80 R14: 0000000000000000 R15: ffffffff94accea0 FS: 0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c2820c0 CR3: 000000007cf00000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: console_emit_next_record kernel/printk/printk.c:2913 [inline] console_flush_all+0x865/0xfd0 kernel/printk/printk.c:2979 console_unlock+0x13b/0x4d0 kernel/printk/printk.c:3048 vprintk_emit+0x5a6/0x770 kernel/printk/printk.c:2348 dev_vprintk_emit+0x2ae/0x330 drivers/base/core.c:4909 dev_printk_emit+0xdd/0x120 drivers/base/core.c:4920 _dev_err+0x122/0x170 drivers/base/core.c:4975 pegasus_irq+0x44d/0x5a0 drivers/input/tablet/pegasus_notetaker.c:195 __usb_hcd_giveback_urb+0x42c/0x6e0 drivers/usb/core/hcd.c:1650 dummy_timer+0x830/0x45d0 drivers/usb/gadget/udc/dummy_hcd.c:1987 __run_hrtimer kernel/time/hrtimer.c:1689 [inline] __hrtimer_run_queues+0x59b/0xd50 kernel/time/hrtimer.c:1753 hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1815 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline] __sysvec_apic_timer_interrupt+0x110/0x3f0 arch/x86/kernel/apic/apic.c:1049 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0x52/0xc0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xd8/0x140 kernel/locking/spinlock.c:194 Code: 9c 8f 44 24 20 42 80 3c 23 00 74 08 4c 89 f7 e8 9e 17 6b f6 f6 44 24 21 02 75 52 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 63 d8 d4 f5 65 8b 05 74 0f 73 74 85 c0 74 43 48 c7 04 24 0e 36 RSP: 0018:ffffc90000a18580 EFLAGS: 00000206 RAX: fc9ac408a45bab00 RBX: 1ffff920001430b4 RCX: ffffffff8172da6a RDX: dffffc0000000000 RSI: ffffffff8bcabb40 RDI: 0000000000000001 RBP: ffffc90000a18620 R08: ffffffff92fa766f R09: 1ffffffff25f4ecd R10: dffffc0000000000 R11: fffffbfff25f4ece R12: dffffc0000000000 R13: 1ffff920001430b0 R14: ffffc90000a185a0 R15: 0000000000000246 stack_depot_save_flags+0x6e4/0x830 lib/stackdepot.c:662 kasan_save_stack mm/kasan/common.c:48 [inline] kasan_save_track+0x51/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object+0xe0/0x150 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2196 [inline] slab_free mm/slub.c:4438 [inline] kmem_cache_free+0x145/0x350 mm/slub.c:4513 kfree_skb include/linux/skbuff.h:1257 [inline] hsr_forward_skb+0x1e8e/0x2680 net/hsr/hsr_forward.c:696 send_hsr_supervision_frame+0x660/0xce0 net/hsr/hsr_device.c:343 hsr_announce+0x1a9/0x370 net/hsr/hsr_device.c:399 call_timer_fn+0x18e/0x650 kernel/time/timer.c:1792 expire_timers kernel/time/timer.c:1843 [inline] __run_timers kernel/time/timer.c:2417 [inline] __run_timer_base+0x66a/0x8e0 kernel/time/timer.c:2428 run_timer_base kernel/time/timer.c:2437 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2447 handle_softirqs+0x2c4/0x970 kernel/softirq.c:554 do_softirq+0x11b/0x1e0 kernel/softirq.c:455 __local_bh_enable_ip+0x1bb/0x200 kernel/softirq.c:382 neigh_periodic_work+0xb35/0xd50 net/core/neighbour.c:1019 process_one_work kernel/workqueue.c:3248 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3329 worker_thread+0x86d/0xd50 kernel/workqueue.c:3409 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 task:kworker/0:3 state:R usb 4-1: pegasus_irq - nonzero urb status received: -71 running task stack:20464 pid:5131 tgid:5131 ppid:2 flags:0x00004000 usb 4-1: pegasus_irq - nonzero urb status received: -71 Workqueue: events_power_efficient gc_worker usb 4-1: pegasus_irq - nonzero urb status received: -71 Call Trace: usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 context_switch kernel/sched/core.c:5408 [inline] __schedule+0x17e8/0x4a20 kernel/sched/core.c:6745 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7067 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354 usb 4-1: pegasus_irq - nonzero urb status received: -71 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 usb 4-1: pegasus_irq - nonzero urb status received: -71 RIP: 0010:seqcount_lockdep_reader_access+0x1e0/0x220 include/linux/seqlock.h:75 usb 4-1: pegasus_irq - nonzero urb status received: -71 Code: f7 4d 85 ed 75 16 e8 8f 2b f6 f7 eb 15 e8 88 2b f6 f7 e8 83 ea e5 01 4d 85 ed 74 ea e8 79 2b f6 f7 fb 48 c7 04 24 0e 36 e0 45 <4b> c7 04 3c 00 00 00 00 66 43 c7 44 3c 09 00 00 43 c6 44 3c 0b 00 usb 4-1: pegasus_irq - nonzero urb status received: -71 RSP: 0018:ffffc900044179a0 EFLAGS: 00000293 usb 4-1: pegasus_irq - nonzero urb status received: -71 RAX: ffffffff899ffc37 RBX: 0000000000000000 RCX: ffff8880241e8000 usb 4-1: pegasus_irq - nonzero urb status received: -71 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 usb 4-1: pegasus_irq - nonzero urb status received: -71 RBP: ffffc90004417a50 R08: ffffffff899ffc0d R09: 1ffffffff25f4ec2 usb 4-1: pegasus_irq - nonzero urb status received: -71 R10: dffffc0000000000 R11: fffffbfff25f4ec3 R12: dffffc0000000000 usb 4-1: pegasus_irq - nonzero urb status received: -71 R13: 0000000000000200 R14: 0000000000000046 R15: 1ffff92000882f34 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 nf_conntrack_get_ht include/net/netfilter/nf_conntrack.h:345 [inline] gc_worker+0x316/0x1530 net/netfilter/nf_conntrack_core.c:1488 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 process_one_work kernel/workqueue.c:3248 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3329 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 worker_thread+0x86d/0xd50 kernel/workqueue.c:3409 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 kthread+0x2f0/0x390 kernel/kthread.c:389 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 rcu: rcu_preempt kthread starved for 1874 jiffies! g18913 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 usb 4-1: pegasus_irq - nonzero urb status received: -71 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. usb 4-1: pegasus_irq - nonzero urb status received: -71 rcu: RCU grace-period kthread stack dump: task:rcu_preempt state:R usb 4-1: pegasus_irq - nonzero urb status received: -71 running task stack:25584 pid:17 tgid:17 ppid:2 flags:0x00004000 usb 4-1: pegasus_irq - nonzero urb status received: -71 Call Trace: usb 4-1: pegasus_irq - nonzero urb status received: -71 context_switch kernel/sched/core.c:5408 [inline] __schedule+0x17e8/0x4a20 kernel/sched/core.c:6745 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 __schedule_loop kernel/sched/core.c:6822 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6837 usb 4-1: pegasus_irq - nonzero urb status received: -71 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2581 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2000 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2202 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 kthread+0x2f0/0x390 kernel/kthread.c:389 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - nonzero urb status received: -71 usb 4-1: pegasus_irq - usb_submit_urb failed with result -1