watchdog: BUG: soft lockup - CPU#1 stuck for 123s! [kworker/1:0:17] Modules linked in: irq event stamp: 298198 hardirqs last enabled at (298197): [] trace_hardirqs_on_thunk+0x1a/0x1c arch/x86/entry/thunk_64.S:41 hardirqs last disabled at (298198): [] trace_hardirqs_off_thunk+0x1a/0x1c arch/x86/entry/thunk_64.S:42 softirqs last enabled at (298196): [] __do_softirq+0x673/0x950 kernel/softirq.c:319 softirqs last disabled at (298189): [] invoke_softirq kernel/softirq.c:373 [inline] softirqs last disabled at (298189): [] irq_exit+0x178/0x1a0 kernel/softirq.c:413 CPU: 1 PID: 17 Comm: kworker/1:0 Not tainted 5.6.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events netstamp_clear RIP: 0010:__read_once_size include/linux/compiler.h:199 [inline] RIP: 0010:csd_lock_wait kernel/smp.c:109 [inline] RIP: 0010:smp_call_function_single+0x2cf/0x3a0 kernel/smp.c:311 Code: 5f 5d c3 e8 53 62 0a 00 48 8b 54 24 08 4c 89 f9 8b 7c 24 14 48 8d 74 24 40 e8 cd f9 ff ff 41 89 c4 eb 07 e8 33 62 0a 00 f3 90 <8b> 5c 24 58 31 ff 83 e3 01 89 de e8 c1 63 0a 00 85 db 75 e5 e8 18 RSP: 0018:ffff8881da267a60 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffff8881da24b100 RBX: 0000000000000001 RCX: ffffffff8134f3bf RDX: 0000000000000000 RSI: ffffffff8134f3ad RDI: 0000000000000005 RBP: ffff8881da267b28 R08: ffff8881da24b100 R09: fffffbfff1266e85 R10: fffffbfff1266e84 R11: ffffffff89337427 R12: 0000000000000000 R13: 0000000000000001 R14: ffffffff87e607c0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005645098cf9c8 CR3: 00000001c9962000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: smp_call_function_many_cond+0x25e/0x900 kernel/smp.c:439 smp_call_function_many kernel/smp.c:498 [inline] smp_call_function kernel/smp.c:520 [inline] on_each_cpu+0x47/0xb0 kernel/smp.c:627 text_poke_sync arch/x86/kernel/alternative.c:942 [inline] text_poke_bp_batch+0x142/0x3f0 arch/x86/kernel/alternative.c:1121 text_poke_flush arch/x86/kernel/alternative.c:1243 [inline] text_poke_finish+0x16/0x21 arch/x86/kernel/alternative.c:1250 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:126 jump_label_update kernel/jump_label.c:808 [inline] jump_label_update+0x1a6/0x370 kernel/jump_label.c:787 static_key_enable_cpuslocked+0x1b1/0x260 kernel/jump_label.c:177 static_key_enable+0x16/0x20 kernel/jump_label.c:190 netstamp_clear+0x5a/0x80 net/core/dev.c:2043 process_one_work+0x94b/0x1620 kernel/workqueue.c:2264 worker_thread+0x96/0xe20 kernel/workqueue.c:2410 kthread+0x318/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 0 Comm: swapper/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:preempt_count arch/x86/include/asm/preempt.h:26 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x9/0x60 kernel/kcov.c:197 Code: 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 48 8b 34 24 74 0e 80 e6 01 RSP: 0018:ffff8881db209a40 EFLAGS: 00000002 RAX: ffffffff8702cc40 RBX: ffffed103a0ef1c4 RCX: ffffffff84ba1c14 RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000005 RBP: ffff8881d0778dd0 R08: ffffffff8702cc40 R09: ffffed1038f770c1 R10: ffffed1038f770c0 R11: ffff8881c7bb8600 R12: ffff8881c7bb88a0 R13: dffffc0000000000 R14: ffffed103a0ef1c5 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2c928000 CR3: 00000001b5716000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: line6_data_received+0x332/0x520 sound/usb/line6/driver.c:311 __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 RIP: 0010:default_idle+0x28/0x300 arch/x86/kernel/process.c:696 Code: cc cc 41 56 41 55 65 44 8b 2d 44 77 72 7a 41 54 55 53 0f 1f 44 00 00 e8 b6 62 b5 fb e9 07 00 00 00 0f 00 2d ea 0c 53 00 fb f4 <65> 44 8b 2d 20 77 72 7a 0f 1f 44 00 00 5b 5d 41 5c 41 5d 41 5e c3 RSP: 0018:ffffffff87007d80 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: ffffffff8702cc40 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000006 RDI: ffffffff8702d48c RBP: fffffbfff0e05988 R08: ffffffff8702cc40 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffffffff87e607c0 R15: 0000000000000000 cpuidle_idle_call kernel/sched/idle.c:154 [inline] do_idle+0x3e0/0x500 kernel/sched/idle.c:269 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:361 start_kernel+0xe16/0xe5a init/main.c:998 secondary_startup_64+0xb6/0xc0 arch/x86/kernel/head_64.S:242