watchdog: BUG: soft lockup - CPU#1 stuck for 123s! [udevd:337] Modules linked in: irq event stamp: 3284086 hardirqs last enabled at (3284085): [] trace_hardirqs_on_thunk+0x1a/0x1c arch/x86/entry/thunk_64.S:41 hardirqs last disabled at (3284086): [] trace_hardirqs_off_thunk+0x1a/0x1c arch/x86/entry/thunk_64.S:42 softirqs last enabled at (3284084): [] __do_softirq+0x673/0x950 kernel/softirq.c:319 softirqs last disabled at (3284077): [] invoke_softirq kernel/softirq.c:373 [inline] softirqs last disabled at (3284077): [] irq_exit+0x178/0x1a0 kernel/softirq.c:413 CPU: 1 PID: 337 Comm: udevd Not tainted 5.6.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 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:ffff8881cf95f8a0 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffff8881cf86c980 RBX: 0000000000000003 RCX: ffffffff8134f3bf RDX: 0000000000000000 RSI: ffffffff8134f3ad RDI: 0000000000000005 RBP: ffff8881cf95f978 R08: ffff8881cf86c980 R09: fffffbfff1266e8a R10: fffffbfff1266e89 R11: ffffffff8933744f R12: 0000000000000000 R13: 0000000000000001 R14: ffff8881d012f440 R15: ffff8881db333e00 FS: 00007f2cfc6d77a0(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd13173748 CR3: 00000001cf8bc000 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 flush_tlb_others arch/x86/include/asm/paravirt.h:68 [inline] flush_tlb_mm_range+0x1e8/0x3e0 arch/x86/mm/tlb.c:798 dup_mmap kernel/fork.c:616 [inline] dup_mm+0xcc6/0x1180 kernel/fork.c:1360 copy_mm kernel/fork.c:1416 [inline] copy_process+0x26ef/0x6640 kernel/fork.c:2081 _do_fork+0x12d/0xfd0 kernel/fork.c:2430 __do_sys_clone kernel/fork.c:2585 [inline] __se_sys_clone kernel/fork.c:2566 [inline] __x64_sys_clone+0x182/0x210 kernel/fork.c:2566 do_syscall_64+0xb6/0x5a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f2cfbdbaf46 Code: f7 d8 64 89 04 25 d4 02 00 00 64 4c 8b 14 25 10 00 00 00 31 d2 49 81 c2 d0 02 00 00 31 f6 bf 11 00 20 01 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 31 01 00 00 85 c0 41 89 c4 0f 85 3b 01 00 RSP: 002b:00007ffd131736a0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007ffd131736a0 RCX: 00007f2cfbdbaf46 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 00007ffd13173700 R08: 0000000000000151 R09: 0000000000000151 R10: 00007f2cfc6d7a70 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd131736c0 R14: 0000000000000005 R15: 0000000000000005 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.6.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: usb_hub_wq hub_event RIP: 0010:memcmp+0x40/0xb0 lib/string.c:918 Code: 53 48 89 fb 48 83 ec 10 eb 0d 48 83 c3 01 48 83 c6 01 49 39 dc 74 45 48 89 d8 48 89 da 48 c1 e8 03 83 e2 07 0f b6 04 28 38 d0 <7f> 04 84 c0 75 54 48 89 f2 48 89 f1 0f b6 03 48 c1 ea 03 83 e1 07 RSP: 0018:ffff8881db2099e8 EFLAGS: 00000046 RAX: 0000000000000000 RBX: ffff8881d3440800 RCX: ffffc90000022000 RDX: 0000000000000000 RSI: ffffffff868f2c00 RDI: ffff8881d3440800 RBP: dffffc0000000000 R08: ffff8881da211880 R09: ffffed103a688101 R10: ffffed103a688100 R11: ffff8881d3440800 R12: ffff8881d3440805 R13: dffffc0000000000 R14: ffffed10390d19c5 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2cfc6de000 CR3: 00000001cf8bc000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: memcmp include/linux/string.h:422 [inline] line6_pod_process_message+0x49/0x5b0 sound/usb/line6/pod.c:181 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 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/irqflags.h:85 [inline] RIP: 0010:console_unlock+0xa6b/0xca0 kernel/printk/printk.c:2481 Code: 00 89 ee 48 c7 c7 60 43 14 87 e8 10 c3 03 00 65 ff 0d a1 ef d8 7e e9 b5 f9 ff ff e8 af 36 16 00 e8 aa 7f 1b 00 ff 74 24 30 9d fd fd ff ff e8 9b 36 16 00 48 8d 7d 08 48 89 f8 48 c1 e8 03 42 RSP: 0018:ffff8881da227618 EFLAGS: 00000216 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: 0000000000000200 RCX: 0000000000000006 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8881da2120cc RBP: 0000000000000000 R08: ffff8881da211880 R09: fffffbfff1266e85 R10: fffffbfff1266e84 R11: ffffffff89337427 R12: ffffffff82a07730 R13: ffffffff874d4810 R14: 000000000000003a R15: dffffc0000000000 vprintk_emit+0x171/0x3d0 kernel/printk/printk.c:1996 dev_vprintk_emit+0x4fc/0x541 drivers/base/core.c:3616 dev_printk_emit+0xba/0xf1 drivers/base/core.c:3627 __dev_printk+0x1db/0x203 drivers/base/core.c:3639 _dev_err+0xd7/0x109 drivers/base/core.c:3682 hub_port_init.cold+0x315/0x362 drivers/usb/core/hub.c:4824 hub_port_connect drivers/usb/core/hub.c:5127 [inline] hub_port_connect_change drivers/usb/core/hub.c:5335 [inline] port_event drivers/usb/core/hub.c:5481 [inline] hub_event+0x1fc6/0x4300 drivers/usb/core/hub.c:5563 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