watchdog: BUG: soft lockup - CPU#0 stuck for 123s! [syz-executor356:1796] Modules linked in: irq event stamp: 37354 hardirqs last enabled at (37353): [] trace_hardirqs_on_thunk+0x1a/0x1c arch/x86/entry/thunk_64.S:41 hardirqs last disabled at (37354): [] trace_hardirqs_off_thunk+0x1a/0x1c arch/x86/entry/thunk_64.S:42 softirqs last enabled at (26810): [] __do_softirq+0x673/0x950 kernel/softirq.c:319 softirqs last disabled at (26793): [] invoke_softirq kernel/softirq.c:373 [inline] softirqs last disabled at (26793): [] irq_exit+0x178/0x1a0 kernel/softirq.c:413 CPU: 0 PID: 1796 Comm: syz-executor356 Not tainted 5.6.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:write_comp_data+0x1e/0x70 kernel/kcov.c:208 Code: 48 89 11 c3 0f 1f 84 00 00 00 00 00 65 4c 8b 04 25 00 0f 02 00 65 8b 05 78 b1 c2 7e a9 00 01 1f 00 75 51 41 8b 80 b0 12 00 00 <83> f8 03 75 45 49 8b 80 b8 12 00 00 45 8b 80 b4 12 00 00 4c 8b 08 RSP: 0018:ffff8881c5ef7a38 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff8134f89f RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000005 RBP: ffff8881c5ef7b08 R08: ffff8881cf2c4980 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffff8881ce6f8c40 R15: ffff8881db233dc0 FS: 0000000000000000(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000704208 CR3: 0000000007021000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: csd_lock_wait kernel/smp.c:109 [inline] smp_call_function_single+0x2df/0x3a0 kernel/smp.c:311 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 __do_sys_exit_group kernel/exit.c:910 [inline] __se_sys_exit_group kernel/exit.c:908 [inline] __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:908 do_syscall_64+0xb6/0x5a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x443668 Code: Bad RIP value. RSP: 002b:00007ffcf4db7be8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000443668 RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 RBP: 00000000004c35a8 R08: 00000000000000e7 R09: ffffffffffffffd0 R10: a4504311277d8a50 R11: 0000000000000246 R12: 0000000000000001 R13: 00000000006d6f20 R14: 0000000000000000 R15: 0000000000000000 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 0 Comm: swapper/1 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_midibuf_bytes_used sound/usb/line6/midibuf.c:80 [inline] RIP: 0010:line6_midibuf_read+0xab/0xa30 sound/usb/line6/midibuf.c:144 Code: 03 38 d0 7c 08 84 d2 0f 85 72 08 00 00 44 8b 65 14 44 89 ef 44 89 e6 e8 53 54 85 fc 45 39 e5 0f 84 ca 06 00 00 e8 55 53 85 fc <48> 8d 7d 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f RSP: 0018:ffff8881db3099e8 EFLAGS: 00000006 RAX: ffff8881da213100 RBX: 0000000000000100 RCX: ffffffff84ba098d RDX: 0000000000000100 RSI: ffffffff84ba099b RDI: 0000000000000004 RBP: ffff8881da2c56a0 R08: ffff8881da213100 R09: ffffed103ada0c81 R10: ffffed103ada0c80 R11: ffff8881d6d06400 R12: 0000000000000040 R13: 0000000000000020 R14: ffffed1039b2d1c5 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f181b050000 CR3: 00000001d0d21000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: line6_data_received+0x318/0x520 sound/usb/line6/driver.c:305 __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:ffff8881da22fda8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: ffff8881da213100 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000006 RDI: ffff8881da21394c RBP: ffffed103b442620 R08: ffff8881da213100 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 R13: 0000000000000001 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_secondary+0x2a4/0x390 arch/x86/kernel/smpboot.c:264 secondary_startup_64+0xb6/0xc0 arch/x86/kernel/head_64.S:242