rcu: INFO: rcu_sched detected stalls on CPUs/tasks:
rcu: 	1-...0: (1 GPs behind) idle=ffa/1/0x4000000000000002 softirq=119876/119877 fqs=5249 
	(detected by 0, t=10502 jiffies, g=166181, q=1766)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 381 Comm: syz-executor.0 Not tainted 5.6.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:196
Code: 00 00 00 00 e9 e8 e7 ff ff cc 65 48 8b 04 25 00 0f 02 00 48 8b 80 c8 12 00 00 c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 <65> 48 8b 04 25 00 0f 02 00 65 8b 15 d8 b8 c2 7e f7 c2 00 01 1f 00
RSP: 0018:ffff8881db309a10 EFLAGS: 00000002
RAX: 0000000000000002 RBX: ffff8881c7a72200 RCX: ffffffff84bac695
RDX: 0000000000000007 RSI: 0000000000000000 RDI: 0000000000000005
RBP: ffff8881c98e8dd0 R08: ffff8881c6b41880 R09: ffffed1038f4e441
R10: ffffed1038f4e440 R11: ffff8881c7a72200 R12: 0000000000000007
R13: dffffc0000000000 R14: ffffed103931d1c5 R15: 0000000000000001
FS:  0000000002648940(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000768060 CR3: 00000001ae107000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 line6_pod_process_message+0x63/0x5b0 sound/usb/line6/pod.c:193
 line6_data_received+0x39b/0x520 sound/usb/line6/driver.c:315
 __usb_hcd_giveback_urb+0x29a/0x550 drivers/usb/core/hcd.c:1650
 usb_hcd_giveback_urb+0x368/0x420 drivers/usb/core/hcd.c:1716
 dummy_timer+0x1258/0x32ae drivers/usb/gadget/udc/dummy_hcd.c:1966
 call_timer_fn+0x195/0x6f0 kernel/time/timer.c:1404
 expire_timers kernel/time/timer.c:1449 [inline]
 __run_timers kernel/time/timer.c:1773 [inline]
 __run_timers kernel/time/timer.c:1740 [inline]
 run_timer_softirq+0x5f9/0x1500 kernel/time/timer.c:1786
 __do_softirq+0x21e/0x950 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x178/0x1a0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:546 [inline]
 smp_apic_timer_interrupt+0x141/0x540 arch/x86/kernel/apic/apic.c:1146
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:_raw_spin_unlock_irq+0x27/0x30 kernel/locking/spinlock.c:200
Code: 44 00 00 55 48 8b 74 24 08 48 89 fd 48 8d 7f 18 e8 5e e8 96 fb 48 89 ef e8 26 ca 97 fb e8 51 4e b5 fb fb 65 ff 0d 31 be 72 7a <5d> c3 0f 1f 80 00 00 00 00 55 48 89 fd 48 83 c7 18 53 48 89 f3 48
RSP: 0018:ffff8881ae147b38 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000007 RBX: ffff8881c6b41880 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000006 RDI: ffff8881c6b420cc
RBP: ffff8881db334640 R08: ffff8881c6b41880 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881db334640
R13: ffff8881c6b43100 R14: 0000000000000000 R15: 0000000000000000
 finish_lock_switch kernel/sched/core.c:3119 [inline]
 finish_task_switch+0x11d/0x5d0 kernel/sched/core.c:3219
 context_switch kernel/sched/core.c:3383 [inline]
 __schedule+0x89a/0x1d80 kernel/sched/core.c:4080
 schedule+0xcd/0x2b0 kernel/sched/core.c:4154
 freezable_schedule include/linux/freezer.h:172 [inline]
 do_nanosleep+0x21f/0x650 kernel/time/hrtimer.c:1874
 hrtimer_nanosleep+0x1df/0x3a0 kernel/time/hrtimer.c:1927
 __do_sys_nanosleep kernel/time/hrtimer.c:1961 [inline]
 __se_sys_nanosleep kernel/time/hrtimer.c:1948 [inline]
 __x64_sys_nanosleep+0x1dc/0x260 kernel/time/hrtimer.c:1948
 do_syscall_64+0xb6/0x5a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45acf0
Code: c0 5b 5d c3 66 0f 1f 44 00 00 8b 04 24 48 83 c4 18 5b 5d c3 66 0f 1f 44 00 00 83 3d 61 dc 82 00 00 75 14 b8 23 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 d4 d1 fb ff c3 48 83 ec 08 e8 ea 46 00 00
RSP: 002b:00007ffdf97c7d68 EFLAGS: 00000246 ORIG_RAX: 0000000000000023
RAX: ffffffffffffffda RBX: 00000000000f8cbd RCX: 000000000045acf0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007ffdf97c7d70
RBP: 00000000000005de R08: 0000000000000001 R09: 0000000002648940
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffdf97c7dc0 R14: 00000000000f8c4e R15: 00007ffdf97c7dd0