usbtmc 4-1:0.0: unknown status received: -71 usbtmc 6-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 4-1:0.0: unknown status received: -71 rcu: INFO: rcu_sched self-detected stall on CPU rcu: 0-...!: (8522 ticks this GP) idle=86e/1/0x4000000000000000 softirq=145117/145117 fqs=1 (t=10504 jiffies g=268537 q=94) rcu: rcu_sched kthread starved for 10502 jiffies! g268537 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:I running task stack:29088 pid: 11 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4322 [inline] __schedule+0x920/0x1fa0 kernel/sched/core.c:5073 schedule+0xcb/0x270 kernel/sched/core.c:5152 schedule_timeout+0x14a/0x250 kernel/time/timer.c:1892 rcu_gp_fqs_loop kernel/rcu/tree.c:2005 [inline] rcu_gp_kthread+0xa36/0x1ba0 kernel/rcu/tree.c:2178 kthread+0x38c/0x460 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 0 to CPUs 1: usbtmc 1-1:0.0: unknown status received: -71 NMI backtrace for cpu 1 CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.12.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:vsnprintf+0x6a/0x14f0 lib/vsprintf.c:2582 Code: c7 44 24 48 b3 8a b5 41 48 01 c8 48 c7 44 24 50 a8 bf ff 86 48 c7 44 24 58 d0 ec 09 82 c7 00 f1 f1 f1 f1 c7 40 04 00 f3 f3 f3 <65> 48 8b 04 25 28 00 00 00 48 89 84 24 a0 00 00 00 31 c0 e8 be 74 RSP: 0018:ffffc9000011f0b0 EFLAGS: 00000082 RAX: fffff52000023e1f RBX: 000000007fffffff RCX: 1ffff92000023e1f RDX: ffffffff8607f7c0 RSI: 000000007fffffff RDI: ffffc9000011f380 RBP: ffffffff8607f7c0 R08: 00000000000006a1 R09: 0000000000000001 R10: ffffffff81296879 R11: 0000000000000000 R12: ffffc9000011f380 R13: ffffffff8607f7c0 R14: 0000000000000000 R15: ffffc9000011f1b0 FS: 0000000000000000(0000) GS:ffff8881f6b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9c2b709718 CR3: 00000001379b9000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: sprintf+0xc0/0x100 lib/vsprintf.c:2853 print_time kernel/printk/printk.c:1251 [inline] info_print_prefix+0x248/0x340 kernel/printk/printk.c:1277 record_print_text+0x14d/0x3e0 kernel/printk/printk.c:1326 console_unlock+0x30f/0xc60 kernel/printk/printk.c:2561 vprintk_emit+0x20a/0x580 kernel/printk/printk.c:2098 dev_vprintk_emit+0x36e/0x3b2 drivers/base/core.c:4434 dev_printk_emit+0xba/0xf1 drivers/base/core.c:4445 __dev_printk+0xcf/0xf5 drivers/base/core.c:4457 _dev_err+0xd7/0x109 drivers/base/core.c:4500 usbtmc_interrupt.cold+0x55/0xdf drivers/usb/class/usbtmc.c:2337 __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+0x11f4/0x32a0 drivers/usb/gadget/udc/dummy_hcd.c:1978 call_timer_fn+0x1a5/0x630 kernel/time/timer.c:1431 expire_timers kernel/time/timer.c:1476 [inline] __run_timers.part.0+0x67c/0xa10 kernel/time/timer.c:1745 __run_timers kernel/time/timer.c:1726 [inline] run_timer_softirq+0x80/0x120 kernel/time/timer.c:1758 __do_softirq+0x1b0/0x944 kernel/softirq.c:345 run_ksoftirqd kernel/softirq.c:652 [inline] run_ksoftirqd+0x21/0x50 kernel/softirq.c:644 smpboot_thread_fn+0x3ec/0x870 kernel/smpboot.c:165 kthread+0x38c/0x460 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 NMI backtrace for cpu 0 usbtmc 5-1:0.0: unknown status received: -71 CPU: 0 PID: 2645 Comm: systemd-journal Not tainted 5.12.0-rc7-syzkaller #0 usbtmc 1-1:0.0: unknown status received: -71 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 usbtmc 5-1:0.0: unknown status received: -71 Call Trace: usbtmc 1-1:0.0: unknown status received: -71 __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x143/0x1db lib/dump_stack.c:120 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 nmi_cpu_backtrace.cold+0x46/0xe0 lib/nmi_backtrace.c:105 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 nmi_trigger_cpumask_backtrace+0x1da/0x200 lib/nmi_backtrace.c:62 usbtmc 5-1:0.0: unknown status received: -71 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x222/0x2a7 kernel/rcu/tree_stall.h:341 usbtmc 1-1:0.0: unknown status received: -71 print_cpu_stall kernel/rcu/tree_stall.h:622 [inline] check_cpu_stall kernel/rcu/tree_stall.h:697 [inline] rcu_pending kernel/rcu/tree.c:3830 [inline] rcu_sched_clock_irq.cold+0x51f/0xada kernel/rcu/tree.c:2650 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 update_process_times+0x139/0x1b0 kernel/time/timer.c:1796 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226 tick_sched_timer+0x1a4/0x2c0 kernel/time/tick-sched.c:1369 __run_hrtimer kernel/time/hrtimer.c:1537 [inline] __hrtimer_run_queues+0x1c0/0xd80 kernel/time/hrtimer.c:1601 hrtimer_interrupt+0x2fc/0x9b0 kernel/time/hrtimer.c:1663 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline] __sysvec_apic_timer_interrupt+0xf5/0x420 arch/x86/kernel/apic/apic.c:1106 sysvec_apic_timer_interrupt+0x2f/0x90 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632 RIP: 0010:_raw_spin_unlock_irqrestore+0x3a/0x50 kernel/locking/spinlock.c:192 Code: 10 e8 ca 78 75 fb 48 89 ef e8 a2 2c 76 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 36 14 50 7a <5b> 5d c3 e8 be 5e 94 fb eb e2 e8 b7 85 fe ff eb e2 0f 1f 44 00 00 RSP: 0018:ffffc90000007b10 EFLAGS: 00000206 RAX: 0000000000000016 RBX: 0000000000000200 RCX: 1ffffffff144703a RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff85b1dad2 RBP: ffff8881090cc000 R08: 0000000000000001 R09: ffffffff8a1ff7b7 R10: 0000000000000001 R11: 0000000000000001 R12: ffff888109228440 R13: ffff88814ed78400 R14: dffffc0000000000 R15: ffff888116cc7400 spin_unlock_irqrestore include/linux/spinlock.h:409 [inline] dummy_timer+0x12f1/0x32a0 drivers/usb/gadget/udc/dummy_hcd.c:1992 call_timer_fn+0x1a5/0x630 kernel/time/timer.c:1431 expire_timers kernel/time/timer.c:1476 [inline] __run_timers.part.0+0x67c/0xa10 kernel/time/timer.c:1745 __run_timers kernel/time/timer.c:1726 [inline] run_timer_softirq+0x80/0x120 kernel/time/timer.c:1758 __do_softirq+0x1b0/0x944 kernel/softirq.c:345 invoke_softirq kernel/softirq.c:221 [inline] __irq_exit_rcu kernel/softirq.c:422 [inline] irq_exit_rcu+0x110/0x1a0 kernel/softirq.c:434 sysvec_apic_timer_interrupt+0x6a/0x90 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632 RIP: 0010:__sanitizer_cov_trace_pc+0x37/0x60 kernel/kcov.c:197 Code: 81 e1 00 01 00 00 65 48 8b 14 25 40 ef 01 00 a9 00 01 ff 00 74 0e 85 c9 74 35 8b 82 44 14 00 00 85 c0 74 2b 8b 82 20 14 00 00 <83> f8 02 75 20 48 8b 8a 28 14 00 00 8b 92 24 14 00 00 48 8b 01 48 RSP: 0018:ffffc90000207960 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff88810ea61b40 RSI: ffffffff8174d07c RDI: ffffffff87943160 RBP: ffff888119d9f420 R08: 0000000000000001 R09: ffffffff87bbd287 R10: fffffbfff0f77a50 R11: 0000000000000001 R12: 0000000000000001 R13: ffffffff87943160 R14: ffff888119d9f422 R15: ffffc90000207c58 acl_permission_check fs/namei.c:326 [inline] generic_permission+0x1c/0x5b0 fs/namei.c:392 kernfs_iop_permission+0x88/0xb0 fs/kernfs/inode.c:291 do_inode_permission fs/namei.c:446 [inline] inode_permission fs/namei.c:513 [inline] inode_permission+0x2a6/0x3a0 fs/namei.c:488 may_lookup fs/namei.c:1660 [inline] link_path_walk.part.0+0x800/0xc90 fs/namei.c:2212 link_path_walk fs/namei.c:2195 [inline] path_openat+0x25a/0x27e0 fs/namei.c:3496 do_filp_open+0x190/0x3d0 fs/namei.c:3527 do_sys_openat2+0x16d/0x420 fs/open.c:1187 do_sys_open fs/open.c:1203 [inline] __do_sys_open fs/open.c:1211 [inline] __se_sys_open fs/open.c:1207 [inline] __x64_sys_open+0x119/0x1c0 fs/open.c:1207 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f2ef825470d Code: 30 2c 00 00 75 10 b8 02 00 00 00 0f 05 48 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 fe 9d 01 00 48 89 04 24 b8 02 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 47 9e 01 00 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007ffe98ce4590 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 000055ebb74d1ef0 RCX: 00007f2ef825470d RDX: 00000000000001b6 RSI: 0000000000080000 RDI: 00007ffe98ce4670 RBP: 0000000000000008 R08: 0000000000000008 R09: 0000000000000001 R10: 0000000000080000 R11: 0000000000000293 R12: 00007f2ef8c9c7b4 R13: 0000000000000001 R14: 0000000000000013 R15: 00007ffe98ce4670 usbtmc 6-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 4-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 4-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 6-1:0.0: unknown status received: -71 usbtmc 6-1:0.0: usb_submit_urb failed: -19 usbtmc 4-1:0.0: unknown status received: -71 usbtmc 4-1:0.0: usb_submit_urb failed: -19 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: usb_submit_urb failed: -19 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: usb_submit_urb failed: -19 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: unknown status received: -71 usbtmc 1-1:0.0: usb_submit_urb failed: -19