mceusb 5-1:0.0: Error: urb status = -71 mceusb 6-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 rcu: INFO: rcu_sched self-detected stall on CPU rcu: 0-...!: (9176 ticks this GP) idle=7f3/1/0x4000000000000000 softirq=145643/145643 fqs=4 (t=10503 jiffies g=261341 q=73) rcu: rcu_sched kthread starved for 10487 jiffies! g261341 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: Unless rcu_sched kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: task:rcu_sched state:R running task stack:29512 pid: 11 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0x947/0x22b0 kernel/sched/core.c:6287 schedule+0xcf/0x270 kernel/sched/core.c:6366 schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881 rcu_gp_fqs_loop+0x164/0x550 kernel/rcu/tree.c:1957 rcu_gp_kthread+0x138/0x1d0 kernel/rcu/tree.c:2130 kthread+0x3c2/0x4a0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 0 to CPUs 1: mceusb 2-1:0.0: Error: urb status = -71 NMI backtrace for cpu 1 CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.14.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x7/0x60 kernel/kcov.c:197 Code: ff b9 ff ff ff ff ba 08 00 00 00 4d 8b 03 48 0f bd ca 49 8b 45 00 48 63 c9 e9 64 ff ff ff 0f 1f 44 00 00 65 8b 05 09 23 c0 7e <89> c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b 14 25 80 ef 01 00 a9 RSP: 0018:ffffc9000011ef18 EFLAGS: 00000046 RAX: 0000000000000101 RBX: 00000000fffffffd RCX: 00000000ffffffff RDX: 0000000000000001 RSI: ffff888100350000 RDI: 0000000000000003 RBP: 00000000ffffffff R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff82105236 R11: 0000000000000000 R12: ffffc9000011f326 R13: ffffc9000011efb7 R14: ffffc9008011f31f R15: ffffc9000011f322 FS: 0000000000000000(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055628c9f2048 CR3: 0000000134f85000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: number+0x76d/0xae0 lib/vsprintf.c:560 vsnprintf+0xf09/0x14f0 lib/vsprintf.c:2863 sprintf+0xc0/0x100 lib/vsprintf.c:2999 print_time kernel/printk/printk.c:1261 [inline] info_print_prefix+0x248/0x340 kernel/printk/printk.c:1287 record_print_text+0x14d/0x3e0 kernel/printk/printk.c:1336 console_unlock+0x2d8/0xb50 kernel/printk/printk.c:2691 vprintk_emit+0x1d3/0x500 kernel/printk/printk.c:2244 dev_vprintk_emit+0x36e/0x3b2 drivers/base/core.c:4559 dev_printk_emit+0xba/0xf1 drivers/base/core.c:4570 __dev_printk+0xcf/0xf5 drivers/base/core.c:4582 _dev_err+0xd7/0x109 drivers/base/core.c:4625 mceusb_dev_recv.cold+0x159/0x18b drivers/media/rc/mceusb.c:1400 __usb_hcd_giveback_urb+0x2b0/0x5c0 drivers/usb/core/hcd.c:1656 usb_hcd_giveback_urb+0x367/0x410 drivers/usb/core/hcd.c:1726 dummy_timer+0x11f9/0x32b0 drivers/usb/gadget/udc/dummy_hcd.c:1987 call_timer_fn+0x1a5/0x630 kernel/time/timer.c:1421 expire_timers kernel/time/timer.c:1466 [inline] __run_timers.part.0+0x675/0x9e0 kernel/time/timer.c:1734 __run_timers kernel/time/timer.c:1715 [inline] run_timer_softirq+0x80/0x120 kernel/time/timer.c:1747 __do_softirq+0x1b0/0x910 kernel/softirq.c:558 run_ksoftirqd kernel/softirq.c:920 [inline] run_ksoftirqd+0x21/0x50 kernel/softirq.c:912 smpboot_thread_fn+0x3be/0x860 kernel/smpboot.c:164 kthread+0x3c2/0x4a0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 NMI backtrace for cpu 0 mceusb 3-1:0.0: Error: urb status = -71 CPU: 0 PID: 10 Comm: ksoftirqd/0 Not tainted 5.14.0-syzkaller #0 mceusb 2-1:0.0: Error: urb status = -71 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 mceusb 3-1:0.0: Error: urb status = -71 Call Trace: mceusb 2-1:0.0: Error: urb status = -71 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105 mceusb 3-1:0.0: Error: urb status = -71 nmi_cpu_backtrace.cold+0x49/0x148 lib/nmi_backtrace.c:105 mceusb 2-1:0.0: Error: urb status = -71 mceusb 3-1:0.0: Error: urb status = -71 nmi_trigger_cpumask_backtrace+0x1d5/0x1f0 lib/nmi_backtrace.c:62 mceusb 2-1:0.0: Error: urb status = -71 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x222/0x2a7 kernel/rcu/tree_stall.h:343 mceusb 3-1:0.0: Error: urb status = -71 print_cpu_stall kernel/rcu/tree_stall.h:627 [inline] check_cpu_stall kernel/rcu/tree_stall.h:711 [inline] rcu_pending kernel/rcu/tree.c:3880 [inline] rcu_sched_clock_irq.cold+0x15f/0x3d4 kernel/rcu/tree.c:2599 mceusb 2-1:0.0: Error: urb status = -71 mceusb 3-1:0.0: Error: urb status = -71 update_process_times+0x139/0x1b0 kernel/time/timer.c:1785 mceusb 2-1:0.0: Error: urb status = -71 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226 mceusb 3-1:0.0: Error: urb status = -71 tick_sched_timer+0x1a4/0x2c0 kernel/time/tick-sched.c:1421 mceusb 2-1:0.0: Error: urb status = -71 mceusb 3-1:0.0: Error: urb status = -71 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x1c0/0xd80 kernel/time/hrtimer.c:1749 mceusb 2-1:0.0: Error: urb status = -71 mceusb 3-1:0.0: Error: urb status = -71 mceusb 2-1:0.0: Error: urb status = -71 hrtimer_interrupt+0x2e8/0x740 kernel/time/hrtimer.c:1811 mceusb 3-1:0.0: Error: urb status = -71 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline] __sysvec_apic_timer_interrupt+0xf5/0x430 arch/x86/kernel/apic/apic.c:1103 mceusb 2-1:0.0: Error: urb status = -71 sysvec_apic_timer_interrupt+0x65/0x90 arch/x86/kernel/apic/apic.c:1097 mceusb 3-1:0.0: Error: urb status = -71 mceusb 2-1:0.0: Error: urb status = -71 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 mceusb 3-1:0.0: Error: urb status = -71 RIP: 0010:_raw_spin_unlock_irqrestore+0x3a/0x50 kernel/locking/spinlock.c:195 mceusb 2-1:0.0: Error: urb status = -71 Code: 10 e8 da fe 5f fb 48 89 ef e8 b2 72 60 fb 81 e3 00 02 00 00 75 17 9c 58 f6 c4 02 75 17 48 85 db 74 01 fb 65 ff 0d a6 77 39 7a <5b> 5d c3 e8 ae 65 7f fb eb e2 e8 87 37 fe ff eb e2 0f 1f 44 00 00 mceusb 3-1:0.0: Error: urb status = -71 RSP: 0018:ffffc900000af9f0 EFLAGS: 00000206 mceusb 2-1:0.0: Error: urb status = -71 RAX: 0000000000000006 RBX: 0000000000000200 RCX: 1ffffffff14b160a mceusb 3-1:0.0: Error: urb status = -71 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff85c877a2 mceusb 2-1:0.0: Error: urb status = -71 RBP: ffff88810f584000 R08: 0000000000000001 R09: ffffffff8a5517ff mceusb 3-1:0.0: Error: urb status = -71 R10: 0000000000000001 R11: ffffc9000dc2c000 R12: ffff88810f741440 mceusb 2-1:0.0: Error: urb status = -71 R13: ffff8881106a7500 R14: dffffc0000000000 R15: ffff88811da50c00 spin_unlock_irqrestore include/linux/spinlock.h:418 [inline] dummy_timer+0x12f6/0x32b0 drivers/usb/gadget/udc/dummy_hcd.c:2001 call_timer_fn+0x1a5/0x630 kernel/time/timer.c:1421 expire_timers kernel/time/timer.c:1466 [inline] __run_timers.part.0+0x675/0x9e0 kernel/time/timer.c:1734 __run_timers kernel/time/timer.c:1715 [inline] run_timer_softirq+0x80/0x120 kernel/time/timer.c:1747 __do_softirq+0x1b0/0x910 kernel/softirq.c:558 run_ksoftirqd kernel/softirq.c:920 [inline] run_ksoftirqd+0x21/0x50 kernel/softirq.c:912 smpboot_thread_fn+0x3be/0x860 kernel/smpboot.c:164 kthread+0x3c2/0x4a0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 mceusb 6-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 mceusb 3-1:0.0: Error: urb status = -71 mceusb 2-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 6-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 mceusb 6-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 mceusb 6-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 mceusb 6-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 2-1:0.0: Error: urb status = -71 mceusb 3-1:0.0: Error: urb status = -71 mceusb 2-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 6-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 mceusb 6-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 3-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: b9 ff ff ff ff mov $0xffffffff,%ecx 5: ba 08 00 00 00 mov $0x8,%edx a: 4d 8b 03 mov (%r11),%r8 d: 48 0f bd ca bsr %rdx,%rcx 11: 49 8b 45 00 mov 0x0(%r13),%rax 15: 48 63 c9 movslq %ecx,%rcx 18: e9 64 ff ff ff jmpq 0xffffff81 1d: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 22: 65 8b 05 09 23 c0 7e mov %gs:0x7ec02309(%rip),%eax # 0x7ec02332 * 29: 89 c1 mov %eax,%ecx <-- trapping instruction 2b: 48 8b 34 24 mov (%rsp),%rsi 2f: 81 e1 00 01 00 00 and $0x100,%ecx 35: 65 48 8b 14 25 80 ef mov %gs:0x1ef80,%rdx 3c: 01 00 3e: a9 .byte 0xa9