watchdog: BUG: soft lockup - CPU#1 stuck for 123s! [syz-executor063:1800] Modules linked in: irq event stamp: 31020 hardirqs last enabled at (31019): [] trace_hardirqs_on_thunk+0x1a/0x1c arch/x86/entry/thunk_64.S:41 hardirqs last disabled at (31020): [] trace_hardirqs_off_thunk+0x1a/0x1c arch/x86/entry/thunk_64.S:42 softirqs last enabled at (384): [] __do_softirq+0x673/0x950 kernel/softirq.c:319 softirqs last disabled at (375): [] invoke_softirq kernel/softirq.c:373 [inline] softirqs last disabled at (375): [] irq_exit+0x178/0x1a0 kernel/softirq.c:413 CPU: 1 PID: 1800 Comm: syz-executor063 Not tainted 5.6.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 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 83 64 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 63 64 0a 00 f3 90 <8b> 5c 24 58 31 ff 83 e3 01 89 de e8 c1 65 0a 00 85 db 75 e5 e8 48 RSP: 0018:ffff8881cd48f7c0 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffff8881d0053100 RBX: 0000000000000001 RCX: ffffffff8134f89f RDX: 0000000000000000 RSI: ffffffff8134f88d RDI: 0000000000000005 RBP: ffff8881cd48f898 R08: ffff8881d0053100 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000001 R14: ffff8881cd82b9c0 R15: ffff8881db333dc0 FS: 0000000000000000(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fec54f75000 CR3: 0000000007021000 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 tlb_flush arch/x86/include/asm/tlb.h:24 [inline] tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:424 [inline] tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:414 [inline] tlb_flush_mmu+0x274/0x630 mm/mmu_gather.c:248 tlb_finish_mmu+0x93/0x420 mm/mmu_gather.c:328 exit_mmap+0x298/0x4d0 mm/mmap.c:3128 __mmput kernel/fork.c:1082 [inline] mmput+0xce/0x3d0 kernel/fork.c:1103 exit_mm kernel/exit.c:485 [inline] do_exit+0xaa0/0x2c50 kernel/exit.c:788 do_group_exit+0x125/0x340 kernel/exit.c:899 get_signal+0x480/0x2470 kernel/signal.c:2734 do_signal+0x88/0x1490 arch/x86/kernel/signal.c:813 exit_to_usermode_loop+0x1a2/0x200 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath arch/x86/entry/common.c:278 [inline] do_syscall_64+0x4e0/0x5a0 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x44a077 Code: Bad RIP value. RSP: 002b:00007f4d4f161cf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: fffffffffffffffc RBX: 0000000000000004 RCX: 000000000044a077 RDX: 00007f4d4f162d20 RSI: 0000000080085502 RDI: 0000000000000004 RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000000000b R10: 0000000000000011 R11: 0000000000000246 R12: 00007f4d4f161d18 R13: 00007f4d4f162d28 R14: 0000000000000036 R15: 00000000000000e7 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-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:line6_pod_process_message+0x78/0x5b0 sound/usb/line6/pod.c:193 Code: 89 c6 e8 7b e8 84 fc 45 85 e4 0f 84 e1 00 00 00 e8 fd e6 84 fc 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 0f b6 04 02 <48> 89 da 83 e2 07 38 d0 7f 08 84 c0 0f 85 57 04 00 00 44 0f b6 23 RSP: 0018:ffff8881db209a20 EFLAGS: 00000802 RAX: 0000000000000000 RBX: ffff8881d4c26200 RCX: ffffffff84ba75e5 RDX: 1ffff1103a984c40 RSI: ffffffff84ba75f3 RDI: 0000000000000005 RBP: ffff8881ce044dd0 R08: ffffffff8702cc40 R09: ffffed103a984c41 R10: ffffed103a984c40 R11: ffff8881d4c26200 R12: 0000000000000008 R13: dffffc0000000000 R14: ffffed1039c089c5 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fec54f75000 CR3: 00000001ce083000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: line6_data_received+0x39b/0x520 sound/usb/line6/driver.c:315 __usb_hcd_giveback_urb+0x1f2/0x470 drivers/usb/core/hcd.c:1648 usb_hcd_giveback_urb+0x368/0x420 drivers/usb/core/hcd.c:1713 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 94 c9 72 7a 41 54 55 53 0f 1f 44 00 00 e8 16 bb b5 fb e9 07 00 00 00 0f 00 2d 3a 5f 53 00 fb f4 <65> 44 8b 2d 70 c9 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: ffffffff87e60000 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+0xde3/0xe27 init/main.c:992 secondary_startup_64+0xb6/0xc0 arch/x86/kernel/head_64.S:242