rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-.... } 2688 jiffies s: 3277 root: 0x1/. rcu: blocking rcu_node structures (internal RCU debug): Sending NMI from CPU 1 to CPUs 0: cdc_wdm 1-1:1.0: nonzero urb status received: -71 NMI backtrace for cpu 0 CPU: 0 PID: 2372 Comm: syslogd Not tainted 6.8.0-rc3-syzkaller-00049-g88bae831f381 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:200 Code: 76 65 f2 00 66 0f 1f 44 00 00 f3 0f 1e fa 48 8b be b0 01 00 00 e8 b0 ff ff ff 31 c0 c3 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 0f 1e fa 65 48 8b 14 25 c0 b0 03 00 65 8b 05 a4 d3 b5 7e a9 00 RSP: 0018:ffffc90000006f40 EFLAGS: 00000046 RAX: 0000000000000002 RBX: ffffc9000000732b RCX: ffffffff864f2fd8 RDX: ffff888115765700 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000003 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 000000000024c078 R12: ffffc9000000732b R13: 0000000000000000 R14: ffffc90080007327 R15: 0000000000000000 FS: 00007f7723e90380(0000) GS:ffff8881f6600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa4af9ceff0 CR3: 000000010f3ee000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: number+0x696/0xb80 lib/vsprintf.c:549 vsnprintf+0x905/0x1870 lib/vsprintf.c:2890 sprintf+0xcd/0x100 lib/vsprintf.c:3028 print_time kernel/printk/printk.c:1324 [inline] info_print_prefix+0x258/0x350 kernel/printk/printk.c:1350 record_print_text+0x143/0x410 kernel/printk/printk.c:1399 printk_get_next_message+0x2ce/0x7c0 kernel/printk/printk.c:2828 console_emit_next_record kernel/printk/printk.c:2868 [inline] console_flush_all+0x3b3/0xd60 kernel/printk/printk.c:2967 console_unlock+0x10c/0x260 kernel/printk/printk.c:3036 vprintk_emit+0x17f/0x5f0 kernel/printk/printk.c:2303 dev_vprintk_emit drivers/base/core.c:4850 [inline] dev_printk_emit+0xfb/0x140 drivers/base/core.c:4861 __dev_printk+0xf5/0x270 drivers/base/core.c:4873 _dev_err+0xe5/0x120 drivers/base/core.c:4916 wdm_int_callback+0x10f/0xaa0 drivers/usb/class/cdc-wdm.c:269 __usb_hcd_giveback_urb+0x359/0x5c0 drivers/usb/core/hcd.c:1648 usb_hcd_giveback_urb+0x389/0x430 drivers/usb/core/hcd.c:1731 dummy_timer+0x1415/0x3600 drivers/usb/gadget/udc/dummy_hcd.c:1987 call_timer_fn+0x193/0x590 kernel/time/timer.c:1700 expire_timers kernel/time/timer.c:1751 [inline] __run_timers+0x759/0xaa0 kernel/time/timer.c:2038 run_timer_softirq+0x58/0xd0 kernel/time/timer.c:2051 __do_softirq+0x20a/0x8c1 kernel/softirq.c:553 invoke_softirq kernel/softirq.c:427 [inline] __irq_exit_rcu kernel/softirq.c:632 [inline] irq_exit_rcu+0xa7/0x110 kernel/softirq.c:644 sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1076 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649 RIP: 0010:file_needs_f_pos_lock fs/file.c:1181 [inline] RIP: 0010:__fdget_pos+0x12a/0x170 fs/file.c:1189 Code: 44 a3 ff 49 8d bc 24 98 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 43 49 8b ac 24 98 01 00 00 <48> b8 00 00 00 00 00 fc ff df 48 8d 7d 38 48 89 fa 48 c1 ea 03 80 RSP: 0018:ffffc900003efe70 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: ffff8881162d7680 RCX: ffffffff81aa988c RDX: 1ffff11022c5af03 RSI: ffffffff81aa98c3 RDI: ffff8881162d7818 RBP: ffffffff8691f9e0 R08: 0000000000000007 R09: 0000000000000001 R10: 0000000000000001 R11: 0000000000000000 R12: ffff8881162d7680 R13: 00005624aef72c50 R14: dffffc0000000000 R15: 0000000000000074 fdget_pos include/linux/file.h:74 [inline] ksys_write+0x72/0x250 fs/read_write.c:634 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd3/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f7723fe4bf2 Code: 89 c7 48 89 44 24 08 e8 7b 34 fa ff 48 8b 44 24 08 48 83 c4 28 c3 c3 64 8b 04 25 18 00 00 00 85 c0 75 20 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 6f 48 8b 15 07 a2 0d 00 f7 d8 64 89 02 48 83 RSP: 002b:00007ffcbf487858 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f7723fe4bf2 RDX: 0000000000000074 RSI: 00005624aef72c50 RDI: 0000000000000003 RBP: 00005624aef72c50 R08: 0000000000000001 R09: 0000000000000000 R10: 00007f77241833a3 R11: 0000000000000246 R12: 0000000000000074 R13: 00007f7723e90300 R14: 0000000000000003 R15: 00005624aef72a60 cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored cdc_wdm 1-1:1.0: nonzero urb status received: -71 cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored cdc_wdm 1-1:1.0: nonzero urb status received: -71 cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored cdc_wdm 1-1:1.0: nonzero urb status received: -71 cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored cdc_wdm 1-1:1.0: nonzero urb status received: -71 cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored cdc_wdm 1-1:1.0: nonzero urb status received: -71 cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored cdc_wdm 1-1:1.0: nonzero urb status received: -71 cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes cdc_wdm 1-1:1.0: nonzero urb status received: -71 cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored cdc_wdm 1-1:1.0: nonzero urb status received: -71 cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored cdc_wdm 1-1:1.0: nonzero urb status received: -71 cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored cdc_wdm 1-1:1.0: nonzero urb status received: -71 cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored cdc_wdm 1-1:1.0: nonzero urb status received: -71 cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored cdc_wdm 1-1:1.0: nonzero urb status received: -71 cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored cdc_wdm 1-1:1.0: nonzero urb status received: -71 cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes cdc_wdm 1-1:1.0: nonzero urb status received: -71 cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored cdc_wdm 1-1:1.0: nonzero urb status received: -71 cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored cdc_wdm 1-1:1.0: nonzero urb status received: -71 cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored cdc_wdm 1-1:1.0: nonzero urb status received: -71 cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored cdc_wdm 1-1:1.0: nonzero urb status received: -71 cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored cdc_wdm 1-1:1.0: nonzero urb status received: -71 cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored cdc_wdm 1-1:1.0: nonzero urb status received: -71 cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored cdc_wdm 1-1:1.0: nonzero urb status received: -71 cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored cdc_wdm 1-1:1.0: nonzero urb status received: -71 cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes cdc_wdm 1-1:1.0: nonzero urb status received: -71 cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored cdc_wdm 1-1:1.0: nonzero urb status received: -71 cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored cdc_wdm 1-1:1.0: nonzero urb status received: -71 cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored cdc_wdm 1-1:1.0: nonzero urb status received: -71 cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored cdc_wdm 1-1:1.0: nonzero urb status received: -71 cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored cdc_wdm 1-1:1.0: nonzero urb status received: -71 cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored cdc_wdm 1-1:1.0: nonzero urb status received: -71 cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored cdc_wdm 1-1:1.0: nonzero urb status received: -71 cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored cdc_wdm 1-1:1.0: nonzero urb status received: -71 cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes cdc_wdm 1-1:1.0: nonzero urb status received: -71 cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored cdc_wdm 1-1:1.0: nonzero urb status received: -71 cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes cdc_wdm 1-1:1.0: wdm_int_callback - usb_submit_urb failed with result -1 imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored usb 1-1: USB disconnect, device number 98 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 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