watchdog: BUG: soft lockup - CPU#0 stuck for 123s! [kworker/0:7:3982] Modules linked in: irq event stamp: 148238 hardirqs last enabled at (148237): [] trace_hardirqs_on_thunk+0x1a/0x1c arch/x86/entry/thunk_64.S:41 hardirqs last disabled at (148238): [] trace_hardirqs_off_thunk+0x1a/0x1c arch/x86/entry/thunk_64.S:42 softirqs last enabled at (148236): [] __do_softirq+0x673/0x950 kernel/softirq.c:319 softirqs last disabled at (148229): [] invoke_softirq kernel/softirq.c:373 [inline] softirqs last disabled at (148229): [] irq_exit+0x178/0x1a0 kernel/softirq.c:413 CPU: 0 PID: 3982 Comm: kworker/0:7 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:csd_lock_wait kernel/smp.c:109 [inline] RIP: 0010:smp_call_function_single+0x2d3/0x3a0 kernel/smp.c:311 Code: 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 62 0a 00 e9 RSP: 0018:ffff8881d6cf7a60 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffff8881d8d30000 RBX: 0000000000000003 RCX: ffffffff8134f3bf RDX: 0000000000000000 RSI: ffffffff8134f3ad RDI: 0000000000000005 RBP: ffff8881d6cf7b28 R08: ffff8881d8d30000 R09: fffffbfff1266e85 R10: fffffbfff1266e84 R11: ffffffff89337427 R12: 0000000000000000 R13: 0000000000000000 R14: ffffffff87e607c0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4bd64ee740 CR3: 00000001d0c5b000 CR4: 00000000001406f0 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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 144 Comm: systemd-journal Not tainted 5.6.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:line6_data_received+0x332/0x520 sound/usb/line6/driver.c:311 Code: 8b 75 50 ba 00 01 00 00 4c 89 e7 e8 98 3d 00 00 31 ff 41 89 c7 89 c6 e8 6c 3b 85 fc 45 85 ff 0f 84 c3 fe ff ff e8 be 39 85 fc <41> 0f b6 06 84 c0 74 08 3c 03 0f 8e 27 01 00 00 44 89 7d 58 80 3b RSP: 0018:ffff8881db309a48 EFLAGS: 00000046 RAX: 0000000000040000 RBX: ffffed103a3eb9c4 RCX: ffffc90000223000 RDX: 0000000000040000 RSI: ffffffff84ba1c22 RDI: 0000000000000005 RBP: ffff8881d1f5cdd0 R08: ffff8881d2204980 R09: ffffed10397f9141 R10: ffffed10397f9140 R11: ffff8881cbfc8a00 R12: ffff8881c7774ca0 R13: dffffc0000000000 R14: ffffed103a3eb9c5 R15: 0000000000000001 FS: 00007f77da6c48c0(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055c547d72000 CR3: 00000001d3f71000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __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:do_raw_spin_lock+0x41/0x290 kernel/locking/spinlock_debug.c:111 Code: 04 53 48 83 ec 68 48 c7 44 24 08 b3 8a b5 41 48 8d 5c 24 08 48 c7 44 24 10 dd 48 dc 86 48 c1 eb 03 48 c7 44 24 18 a0 16 27 81 <48> 8d 14 03 c7 02 f1 f1 f1 f1 c7 42 04 04 f3 f3 f3 48 89 fa 65 48 RSP: 0018:ffff8881d1c2f5a0 EFLAGS: 00000a02 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: 1ffff1103a385eb5 RCX: 0000000000001357 RDX: 0000000000000000 RSI: 1ffff1103a385ea3 RDI: ffff8881d280a084 RBP: ffff8881d280a080 R08: ffffffff892f4e38 R09: fffffbfff1266e86 R10: fffffbfff1266e85 R11: ffffffff8933742f R12: ffff8881d1c2f770 R13: 0000000000000002 R14: 0000000000000040 R15: 0000000000000000 spin_lock include/linux/spinlock.h:338 [inline] lockref_get_not_dead+0x14/0x80 lib/lockref.c:211 legitimize_path.isra.0+0x7e/0x1c0 fs/namei.c:621 unlazy_walk+0x109/0x3b0 fs/namei.c:689 complete_walk+0xc6/0x2d0 fs/namei.c:793 path_lookupat.isra.0+0x1f4/0x460 fs/namei.c:2440 filename_lookup+0x1a3/0x3e0 fs/namei.c:2466 unix_find_other+0xd3/0x720 net/unix/af_unix.c:943 unix_dgram_sendmsg+0x9ba/0x1460 net/unix/af_unix.c:1706 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x6b9/0x7d0 net/socket.c:2343 ___sys_sendmsg+0x100/0x170 net/socket.c:2397 __sys_sendmsg+0xec/0x1b0 net/socket.c:2430 do_syscall_64+0xb6/0x5a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f77d9c54e67 Code: 89 02 48 c7 c0 ff ff ff ff eb d0 0f 1f 84 00 00 00 00 00 8b 05 6a b5 20 00 85 c0 75 2e 48 63 ff 48 63 d2 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 8b 15 11 71 20 00 f7 d8 64 89 02 48 RSP: 002b:00007ffeb127ebe8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007ffeb127ebf0 RCX: 00007f77d9c54e67 RDX: 0000000000004000 RSI: 00007ffeb127ebf0 RDI: 0000000000000005 RBP: 00007ffeb127f100 R08: 000000000000ffff R09: 0000000000000005 R10: 000055af443fa000 R11: 0000000000000246 R12: 00007ffeb127f430 R13: 00007ffeb127ed10 R14: 0000000000000005 R15: 00007ffeb127ecb0