rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-....: (7154 ticks this GP) idle=15bc/1/0x4000000000000000 softirq=21197/21197 fqs=3740 rcu: hardirqs softirqs csw/system rcu: number: 9 4673 0 rcu: cputime: 0 446 25625 ==> 52560(ms) rcu: (detected by 0, t=10508 jiffies, g=13005, q=216983 ncpus=2) Sending NMI from CPU 0 to CPUs 1: yealink 4-1:36.0: urb_ctl_callback - urb status -71 NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 5217 Comm: kworker/1:3 Not tainted 6.14.0-rc3-syzkaller-00071-gb331a3d8097f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Workqueue: usb_hub_wq hub_event RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x0/0x20 kernel/kcov.c:313 Code: 0c 24 0f b7 d6 0f b7 f7 bf 03 00 00 00 e9 58 fe ff ff 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 48 8b 0c 24 89 f2 89 fe bf 05 00 00 00 e9 2a fe ff ff RSP: 0018:ffffc900001b8420 EFLAGS: 00000086 RAX: 0000000000000003 RBX: fffffbfff11b9748 RCX: 1ffff9200003709f RDX: 0000000000000003 RSI: 0000000000000001 RDI: 0000000000000001 RBP: ffffffff88dcba40 R08: 0000000000000001 R09: fffff5200003709f R10: ffffc900001b84ff R11: 000000000005d330 R12: ffffc900001b84d8 R13: ffffffff88dcba20 R14: 0000000000000001 R15: ffffc900001b84f8 FS: 0000000000000000(0000) GS:ffff8881f5900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f46609d8d3d CR3: 0000000008ca2000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: prb_first_seq kernel/printk/printk_ringbuffer.c:1963 [inline] _prb_read_valid+0x546/0x7e0 kernel/printk/printk_ringbuffer.c:2114 desc_update_last_finalized+0xec/0x1d0 kernel/printk/printk_ringbuffer.c:1515 vprintk_store+0xae8/0xc00 kernel/printk/printk.c:2352 vprintk_emit+0x155/0x6f0 kernel/printk/printk.c:2408 dev_vprintk_emit drivers/base/core.c:4890 [inline] dev_printk_emit+0xfb/0x140 drivers/base/core.c:4901 __dev_printk+0xf5/0x270 drivers/base/core.c:4913 _dev_err+0xe5/0x120 drivers/base/core.c:4956 urb_ctl_callback+0x1eb/0x2f0 drivers/input/misc/yealink.c:456 __usb_hcd_giveback_urb+0x389/0x6e0 drivers/usb/core/hcd.c:1650 usb_hcd_giveback_urb+0x396/0x450 drivers/usb/core/hcd.c:1734 dummy_timer+0x17f7/0x3960 drivers/usb/gadget/udc/dummy_hcd.c:1994 __run_hrtimer kernel/time/hrtimer.c:1801 [inline] __hrtimer_run_queues+0x20a/0xae0 kernel/time/hrtimer.c:1865 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1882 handle_softirqs+0x206/0x8d0 kernel/softirq.c:561 __do_softirq kernel/softirq.c:595 [inline] invoke_softirq kernel/softirq.c:435 [inline] __irq_exit_rcu+0xfa/0x160 kernel/softirq.c:662 irq_exit_rcu+0x9/0x30 kernel/softirq.c:678 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2061 [inline] RIP: 0010:vprintk_emit+0x621/0x6f0 kernel/printk/printk.c:2431 Code: 85 ed 0f 85 81 00 00 00 e8 ec e3 1f 00 9c 41 5c 41 81 e4 00 02 00 00 31 ff 4c 89 e6 e8 08 df 1f 00 4d 85 e4 0f 85 8d 00 00 00 ca e3 1f 00 45 31 c9 41 b8 01 00 00 00 31 c9 48 8d 05 00 00 00 RSP: 0018:ffffc9000205ee28 EFLAGS: 00000246 RAX: 0000000000100000 RBX: 000000000000002e RCX: ffffc9000fc17000 RDX: 0000000000100000 RSI: ffffffff815b5348 RDI: 0000000000000007 RBP: 1ffff9200040bdc7 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000005 R12: 0000000000000000 R13: 0000000000000200 R14: ffff888111773a80 R15: ffffc9000205eef0 _printk+0xc8/0x100 kernel/printk/printk.c:2457 stk1135_serial_wait_ready drivers/media/usb/gspca/stk1135.c:118 [inline] sensor_read_8+0xcd/0xf0 drivers/media/usb/gspca/stk1135.c:133 sensor_read_16 drivers/media/usb/gspca/stk1135.c:144 [inline] sensor_read drivers/media/usb/gspca/stk1135.c:180 [inline] sensor_write_mask+0x89/0x120 drivers/media/usb/gspca/stk1135.c:192 stk1135_camera_disable+0x5d/0xc0 drivers/media/usb/gspca/stk1135.c:366 sd_init+0x1b7/0x210 drivers/media/usb/gspca/stk1135.c:424 gspca_dev_probe2+0xbbd/0x1b60 drivers/media/usb/gspca/gspca.c:1532 gspca_dev_probe+0x18b/0x270 drivers/media/usb/gspca/gspca.c:1608 usb_probe_interface+0x300/0x9c0 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:579 [inline] really_probe+0x23e/0xa90 drivers/base/dd.c:658 __driver_probe_device+0x1de/0x440 drivers/base/dd.c:800 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:830 __device_attach_driver+0x1df/0x310 drivers/base/dd.c:958 bus_for_each_drv+0x157/0x1e0 drivers/base/bus.c:462 __device_attach+0x1e8/0x4b0 drivers/base/dd.c:1030 bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:537 device_add+0x114b/0x1a70 drivers/base/core.c:3665 usb_set_configuration+0x10cb/0x1c50 drivers/usb/core/message.c:2210 usb_generic_driver_probe+0xb1/0x110 drivers/usb/core/generic.c:250 usb_probe_device+0xec/0x3e0 drivers/usb/core/driver.c:291 call_driver_probe drivers/base/dd.c:579 [inline] really_probe+0x23e/0xa90 drivers/base/dd.c:658 __driver_probe_device+0x1de/0x440 drivers/base/dd.c:800 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:830 __device_attach_driver+0x1df/0x310 drivers/base/dd.c:958 bus_for_each_drv+0x157/0x1e0 drivers/base/bus.c:462 __device_attach+0x1e8/0x4b0 drivers/base/dd.c:1030 bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:537 device_add+0x114b/0x1a70 drivers/base/core.c:3665 usb_new_device+0xd09/0x1a20 drivers/usb/core/hub.c:2663 hub_port_connect drivers/usb/core/hub.c:5531 [inline] hub_port_connect_change drivers/usb/core/hub.c:5671 [inline] port_event drivers/usb/core/hub.c:5831 [inline] hub_event+0x2e58/0x4f40 drivers/usb/core/hub.c:5913 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3236 process_scheduled_works kernel/workqueue.c:3317 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3398 kthread+0x3af/0x750 kernel/kthread.c:464 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 rcu: rcu_preempt kthread starved for 2097 jiffies! g13005 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 yealink 4-1:36.0: urb_irq_callback - urb status -71 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: yealink 4-1:36.0: unexpected response 0 task:rcu_preempt state:R running task stack:27200 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000 Call Trace: yealink 4-1:36.0: urb_ctl_callback - urb status -71 context_switch kernel/sched/core.c:5378 [inline] __schedule+0x113d/0x35d0 kernel/sched/core.c:6765 yealink 4-1:36.0: urb_irq_callback - urb status -71 yealink 4-1:36.0: unexpected response 0 __schedule_loop kernel/sched/core.c:6842 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6857 yealink 4-1:36.0: urb_ctl_callback - urb status -71 schedule_timeout+0x124/0x280 kernel/time/sleep_timeout.c:99 yealink 4-1:36.0: urb_irq_callback - urb status -71 yealink 4-1:36.0: unexpected response 0 rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:2024 yealink 4-1:36.0: urb_ctl_callback - urb status -71 yealink 4-1:36.0: urb_irq_callback - urb status -71 rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:2226 yealink 4-1:36.0: unexpected response 0 yealink 4-1:36.0: urb_ctl_callback - urb status -71 kthread+0x3af/0x750 kernel/kthread.c:464 yealink 4-1:36.0: urb_irq_callback - urb status -71 yealink 4-1:36.0: unexpected response 0 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 yealink 4-1:36.0: urb_ctl_callback - urb status -71 rcu: Stack dump where RCU GP kthread last ran: CPU: 0 UID: 0 PID: 2941 Comm: syz-executor Not tainted 6.14.0-rc3-syzkaller-00071-gb331a3d8097f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline] RIP: 0010:smp_call_function_many_cond+0x4c6/0x12c0 kernel/smp.c:885 yealink 4-1:36.0: urb_irq_callback - urb status -71 Code: 0b 00 85 ed 74 4d 48 b8 00 00 00 00 00 fc ff df 4d 89 fc 4c 89 fd 49 c1 ec 03 83 e5 07 49 01 c4 83 c5 03 e8 8c d5 0b 00 f3 90 <41> 0f b6 04 24 40 38 c5 7c 08 84 c0 0f 85 e8 0b 00 00 8b 43 08 31 yealink 4-1:36.0: unexpected response 0 RSP: 0018:ffffc9000180f838 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffff8881f5942b40 RCX: ffffffff816f612a RDX: ffff888111773a80 RSI: ffffffff816f6104 RDI: 0000000000000005 RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000 yealink 4-1:36.0: urb_ctl_callback - urb status -71 R10: 0000000000000001 R11: 0000000000000002 R12: ffffed103eb28569 R13: 0000000000000001 R14: ffff8881f583e3c0 R15: ffff8881f5942b48 FS: 0000000000000000(0000) GS:ffff8881f5800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 yealink 4-1:36.0: urb_irq_callback - urb status -71 CR2: 00007fa5a4408270 CR3: 00000001432ba000 CR4: 00000000003506f0 yealink 4-1:36.0: unexpected response 0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 yealink 4-1:36.0: urb_ctl_callback - urb status -71 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 yealink 4-1:36.0: urb_irq_callback - urb status -71 Call Trace: yealink 4-1:36.0: unexpected response 0 yealink 4-1:36.0: urb_ctl_callback - urb status -71 yealink 4-1:36.0: urb_irq_callback - urb status -71 yealink 4-1:36.0: unexpected response 0 yealink 4-1:36.0: urb_ctl_callback - urb status -71 yealink 4-1:36.0: urb_irq_callback - urb status -71 yealink 4-1:36.0: unexpected response 0 yealink 4-1:36.0: urb_ctl_callback - urb status -71 yealink 4-1:36.0: urb_ctl_callback - usb_submit_urb failed -19 on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1052 __flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline] flush_tlb_multi arch/x86/mm/tlb.c:966 [inline] flush_tlb_mm_range+0x271/0x4a0 arch/x86/mm/tlb.c:1054 tlb_flush arch/x86/include/asm/tlb.h:20 [inline] tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:481 [inline] tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:471 [inline] tlb_flush_mmu mm/mmu_gather.c:395 [inline] tlb_finish_mmu+0x3c9/0x7b0 mm/mmu_gather.c:488 exit_mmap+0x40e/0xba0 mm/mmap.c:1297 __mmput kernel/fork.c:1356 [inline] mmput+0xdb/0x370 kernel/fork.c:1378 exit_mm kernel/exit.c:570 [inline] do_exit+0x9ba/0x2ce0 kernel/exit.c:925 do_group_exit+0xd3/0x2a0 kernel/exit.c:1087 get_signal+0x24ed/0x26c0 kernel/signal.c:3036 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x147/0x260 kernel/entry/common.c:218 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f4160623393 Code: Unable to access opcode bytes at 0x7f4160623369. RSP: 002b:00007ffd24f03f38 EFLAGS: 00000202 ORIG_RAX: 000000000000003d RAX: fffffffffffffe00 RBX: 0000000000000b83 RCX: 00007f4160623393 RDX: 0000000040000000 RSI: 00007ffd24f03f4c RDI: 00000000ffffffff RBP: 00007ffd24f03f4c R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000008 R13: 0000000000000003 R14: 0000000000000009 R15: 0000000000000000