rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: (detected by 1, t=10502 jiffies, g=164589, q=500 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10077 (4295071667-4295061590), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10077 jiffies! g164589 f0x2 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:28120 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5295 [inline]
__schedule+0x15dd/0x52d0 kernel/sched/core.c:6908
__schedule_loop kernel/sched/core.c:6990 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7005
schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
usb 5-1: pegasus_irq - nonzero urb status received: -71
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5885 Comm: kworker/0:5 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: usb_hub_wq hub_event
RIP: 0010:__asan_memcpy+0x0/0x70 mm/kasan/shadow.c:104
Code: c9 7d 09 31 c0 5b 41 5c 41 5e 41 5f e9 09 8d 80 09 cc 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 41 57 41 56 41 54 53 48 89 d3 49 89 f6 49 89 ff 4c 8b
RSP: 0018:ffffc90000006ea8 EFLAGS: 00000093
RAX: ffffffff8ba966b1 RBX: 0000000000000001 RCX: ffff88803359bd00
RDX: 0000000000000001 RSI: ffffffff8bcd8960 RDI: ffffc90000007180
RBP: ffffffff8bcd8961 R08: ffff88803359bd00 R09: 0000000000000008
R10: 0000000000000007 R11: 0000000000000002 R12: 0000000000000001
R13: ffffc90000007180 R14: 0000000000000000 R15: ffffffff8bcd8960
FS: 0000000000000000(0000) GS:ffff888125464000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33209ff8 CR3: 000000003a72e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 000000000000000a
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
vsnprintf+0x38b/0xee0 lib/vsprintf.c:2899
sprintf+0xe7/0x140 lib/vsprintf.c:3111
print_time kernel/printk/printk.c:1359 [inline]
info_print_prefix+0x16b/0x360 kernel/printk/printk.c:1385
record_print_text+0x176/0x450 kernel/printk/printk.c:1434
printk_get_next_message+0x29c/0x880 kernel/printk/printk.c:3072
console_emit_next_record kernel/printk/printk.c:3137 [inline]
console_flush_one_record kernel/printk/printk.c:3269 [inline]
console_flush_all+0x501/0xb20 kernel/printk/printk.c:3343
__console_flush_and_unlock kernel/printk/printk.c:3373 [inline]
console_unlock+0xd1/0x1c0 kernel/printk/printk.c:3413
vprintk_emit+0x485/0x560 kernel/printk/printk.c:2479
dev_vprintk_emit+0x355/0x420 drivers/base/core.c:4913
dev_printk_emit+0xee/0x140 drivers/base/core.c:4924
_dev_err+0x11e/0x180 drivers/base/core.c:4979
pegasus_irq+0x483/0x5a0 drivers/input/tablet/pegasus_notetaker.c:198
__usb_hcd_giveback_urb+0x376/0x540 drivers/usb/core/hcd.c:1657
dummy_timer+0xbbd/0x45d0 drivers/usb/gadget/udc/dummy_hcd.c:1995
__run_hrtimer kernel/time/hrtimer.c:1785 [inline]
__hrtimer_run_queues+0x53a/0xcc0 kernel/time/hrtimer.c:1849
hrtimer_run_softirq+0x182/0x5a0 kernel/time/hrtimer.c:1866
handle_softirqs+0x22a/0x870 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723
irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:its_return_thunk+0x0/0x10 arch/x86/lib/retpoline.S:417
Code: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 e9 2b ea 82 f5 cc
RSP: 0018:ffffc9000494f378 EFLAGS: 00000206
RAX: 0000000000000001 RBX: ffff888036113b40 RCX: 0000000000000046
RDX: 0000000000000005 RSI: ffffffff8e163e78 RDI: ffffffff8c27b080
RBP: 0000000000000001 R08: ffffffff826f211c R09: ffffffff8e7602e0
R10: dffffc0000000000 R11: ffffed1006c22769 R12: dffffc0000000000
R13: ffff88801b6d5918 R14: ffff888036113b40 R15: dffffc0000000000
kernfs_next_descendant_post+0x5c/0x310 fs/kernfs/dir.c:1378
kernfs_activate fs/kernfs/dir.c:1433 [inline]
kernfs_add_one+0x452/0x5c0 fs/kernfs/dir.c:839
__kernfs_create_file+0x22b/0x2e0 fs/kernfs/file.c:1086
sysfs_add_file_mode_ns+0x238/0x300 fs/sysfs/file.c:313
sysfs_merge_group+0x183/0x320 fs/sysfs/group.c:382
add_power_attributes drivers/usb/core/sysfs.c:657 [inline]
usb_create_sysfs_dev_files+0x188/0x490 drivers/usb/core/sysfs.c:1077
usb_bus_notify+0xda/0x110 drivers/usb/core/usb.c:1177
notifier_call_chain+0x1be/0x400 kernel/notifier.c:85
blocking_notifier_call_chain+0x6a/0x90 kernel/notifier.c:380
bus_notify+0x143/0x180 drivers/base/bus.c:1038
device_add+0x54d/0xb70 drivers/base/core.c:3669
usb_new_device+0xa08/0x16f0 drivers/usb/core/hub.c:2695
hub_port_connect drivers/usb/core/hub.c:5567 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
port_event drivers/usb/core/hub.c:5871 [inline]
hub_event+0x2a1c/0x4f30 drivers/usb/core/hub.c:5953
process_one_work kernel/workqueue.c:3275 [inline]
process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358
worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
usb 5-1: pegasus_irq - usb_submit_urb failed with result -1