rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-.... } 2634 jiffies s: 1665 root: 0x2/. rcu: blocking rcu_node structures (internal RCU debug): Sending NMI from CPU 0 to CPUs 1: cdc_wdm 6-1:1.0: wdm_int_callback - 0 bytes NMI backtrace for cpu 1 CPU: 1 PID: 9237 Comm: syz-executor.2 Not tainted 6.1.0-rc7-syzkaller-00134-g1524ceb14dd5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 RIP: 0010:io_serial_out+0x8b/0xa0 drivers/tty/serial/8250/8250_port.c:467 Code: 48 8d 7d 40 44 89 e1 48 b8 00 00 00 00 00 fc ff df 48 89 fa d3 e3 48 c1 ea 03 80 3c 02 00 75 18 66 03 5d 40 44 89 e8 89 da ee <5b> 5d 41 5c 41 5d c3 e8 c9 85 23 ff eb a4 e8 f2 85 23 ff eb e1 41 RSP: 0018:ffffc90000178388 EFLAGS: 00000002 RAX: 000000000000005b RBX: 00000000000003f8 RCX: 0000000000000000 RDX: 00000000000003f8 RSI: ffffffff8256db81 RDI: ffffffff8bac8560 RBP: ffffffff8bac8520 R08: 0000000000000001 R09: 000000000000001f R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 R13: 000000000000005b R14: ffffffff8256db20 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8cbae2b988 CR3: 00000001254f0000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: serial_out drivers/tty/serial/8250/8250.h:123 [inline] serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3365 [inline] serial8250_console_write+0xd0e/0x1010 drivers/tty/serial/8250/8250_port.c:3436 call_console_driver kernel/printk/printk.c:1942 [inline] console_emit_next_record.constprop.0+0x3de/0x840 kernel/printk/printk.c:2731 console_flush_all kernel/printk/printk.c:2793 [inline] console_unlock+0x3be/0x600 kernel/printk/printk.c:2860 vprintk_emit+0x1b9/0x5f0 kernel/printk/printk.c:2268 dev_vprintk_emit+0x36e/0x3b2 drivers/base/core.c:4736 dev_printk_emit+0xba/0xf1 drivers/base/core.c:4747 __dev_printk+0xcf/0xf5 drivers/base/core.c:4759 _dev_err+0xd7/0x109 drivers/base/core.c:4802 wdm_int_callback.cold+0x3b/0x104 drivers/usb/class/cdc-wdm.c:276 __usb_hcd_giveback_urb+0x2b6/0x5c0 drivers/usb/core/hcd.c:1671 usb_hcd_giveback_urb+0x380/0x430 drivers/usb/core/hcd.c:1754 dummy_timer+0x11ff/0x32c0 drivers/usb/gadget/udc/dummy_hcd.c:1988 call_timer_fn+0x1da/0x7c0 kernel/time/timer.c:1474 expire_timers kernel/time/timer.c:1519 [inline] __run_timers.part.0+0x6a2/0xaf0 kernel/time/timer.c:1790 __run_timers kernel/time/timer.c:1768 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1803 __do_softirq+0x1e4/0xabb kernel/softirq.c:571 invoke_softirq kernel/softirq.c:445 [inline] __irq_exit_rcu+0x113/0x170 kernel/softirq.c:650 irq_exit_rcu+0x5/0x20 kernel/softirq.c:662 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1107 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649 RIP: 0010:unwind_next_frame+0x1453/0x1cc0 arch/x86/kernel/unwind_orc.c:622 Code: b3 74 68 00 48 8b 4c 24 28 4c 8b 44 24 20 e9 eb f4 ff ff 48 b8 00 00 00 00 00 fc ff df 48 8b 54 24 08 48 c1 ea 03 80 3c 02 00 <0f> 85 e2 07 00 00 49 8d 7d 08 49 8b 5d 38 48 b8 00 00 00 00 00 fc RSP: 0018:ffffc90005a57410 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 0000000000000001 RDX: 1ffff92000b4ae97 RSI: ffffc90005a57850 RDI: ffffc90005a574c0 RBP: ffff88813107ca1c R08: ffffffff897a029c R09: ffffc90005a574b4 R10: fffff52000b4ae9b R11: ffffc90005a57878 R12: ffffc90005a574b5 R13: ffffc90005a57480 R14: ffffc90005a57850 R15: ffffffff897a02a0 arch_stack_walk+0x7d/0xe0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:122 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45 kasan_set_track+0x21/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:371 [inline] __kasan_kmalloc+0x7a/0x90 mm/kasan/common.c:380 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:955 [inline] __kmalloc_node_track_caller+0x57/0xc0 mm/slab_common.c:975 kmalloc_reserve net/core/skbuff.c:437 [inline] __alloc_skb+0xd9/0x2f0 net/core/skbuff.c:509 alloc_skb include/linux/skbuff.h:1267 [inline] alloc_uevent_skb+0x7b/0x210 lib/kobject_uevent.c:290 uevent_net_broadcast_untagged lib/kobject_uevent.c:326 [inline] kobject_uevent_net_broadcast lib/kobject_uevent.c:409 [inline] kobject_uevent_env+0xc1e/0x1620 lib/kobject_uevent.c:593 __device_release_driver drivers/base/dd.c:1264 [inline] device_release_driver_internal+0x5c9/0x700 drivers/base/dd.c:1275 driver_detach+0xd5/0x1a0 drivers/base/dd.c:1338 bus_remove_driver+0x104/0x300 drivers/base/bus.c:677 driver_unregister+0x73/0xb0 drivers/base/driver.c:274 usb_gadget_unregister_driver+0x48/0x70 drivers/usb/gadget/udc/core.c:1592 raw_release+0x18b/0x290 drivers/usb/gadget/legacy/raw_gadget.c:413 __fput+0x27c/0xa90 fs/file_table.c:320 task_work_run+0x16b/0x270 kernel/task_work.c:179 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xb35/0x29a0 kernel/exit.c:820 do_group_exit+0xd0/0x2a0 kernel/exit.c:950 get_signal+0x21a1/0x2430 kernel/signal.c:2858 arch_do_signal_or_restart+0x82/0x2300 arch/x86/kernel/signal.c:869 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x156/0x200 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:296 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f342e291ec7 Code: Unable to access opcode bytes at 0x7f342e291e9d. RSP: 002b:00007f342d603098 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: fffffffffffffff0 RBX: 00007f342d604110 RCX: 00007f342e291ec7 RDX: 0000000000000000 RSI: 0000000000005501 RDI: 0000000000000005 RBP: 0000000000000005 R08: 0000000000007fef R09: 000000000000000b R10: 00007f342d603140 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000020000500 R15: 00000000000010d0 imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored cdc_wdm 6-1:1.0: nonzero urb status received: -71 cdc_wdm 6-1:1.0: wdm_int_callback - 0 bytes imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored usb 4-1: new high-speed USB device number 90 using dummy_hcd usb 4-1: config 1 interface 0 altsetting 0 endpoint 0x2 has an invalid bInterval 129, changing to 11 usb 4-1: New USB device found, idVendor=056a, idProduct=0033, bcdDevice= 0.40 usb 4-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 4-1: Product: syz usb 4-1: Manufacturer: syz usb 4-1: SerialNumber: syz usbhid 4-1:1.0: can't add hid device: -71 usbhid: probe of 4-1:1.0 failed with error -71 usb 4-1: USB disconnect, device number 90 usb 4-1: new high-speed USB device number 91 using dummy_hcd usb 4-1: config 1 interface 0 altsetting 0 endpoint 0x2 has an invalid bInterval 129, changing to 11 usb 4-1: New USB device found, idVendor=056a, idProduct=0033, bcdDevice= 0.40 usb 4-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 4-1: Product: syz usb 4-1: Manufacturer: syz usb 4-1: SerialNumber: syz usbhid 4-1:1.0: can't add hid device: -71 usbhid: probe of 4-1:1.0 failed with error -71 usb 4-1: USB disconnect, device number 91 usb 4-1: new high-speed USB device number 92 using dummy_hcd usb 4-1: config 1 interface 0 altsetting 0 endpoint 0x2 has an invalid bInterval 129, changing to 11 usb 4-1: New USB device found, idVendor=056a, idProduct=0033, bcdDevice= 0.40 usb 4-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 4-1: Product: syz usb 4-1: Manufacturer: syz usb 4-1: SerialNumber: syz usbhid 4-1:1.0: can't add hid device: -71 usbhid: probe of 4-1:1.0 failed with error -71 usb 4-1: USB disconnect, device number 92