watchdog: BUG: soft lockup - CPU#1 stuck for 123s! [syz-executor.2:1823] Modules linked in: irq event stamp: 2787752 hardirqs last enabled at (2787751): [] trace_hardirqs_on_thunk+0x1a/0x1c arch/x86/entry/thunk_64.S:41 hardirqs last disabled at (2787752): [] trace_hardirqs_off_thunk+0x1a/0x1c arch/x86/entry/thunk_64.S:42 softirqs last enabled at (2787750): [] __do_softirq+0x673/0x950 kernel/softirq.c:319 softirqs last disabled at (2787743): [] invoke_softirq kernel/softirq.c:373 [inline] softirqs last disabled at (2787743): [] irq_exit+0x178/0x1a0 kernel/softirq.c:413 CPU: 1 PID: 1823 Comm: syz-executor.2 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:write_comp_data+0x9/0x80 kernel/kcov.c:218 Code: 12 00 00 48 8b 11 48 83 c2 01 48 39 d0 76 07 48 89 34 d1 48 89 11 c3 66 2e 0f 1f 84 00 00 00 00 00 65 4c 8b 04 25 00 0f 02 00 <65> 8b 05 78 b8 c2 7e a9 00 01 1f 00 74 0f f6 c4 01 74 5b 41 80 b8 RSP: 0018:ffff8881ae7c7798 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 RAX: ffff8881d4844980 RBX: 0000000000000001 RCX: ffffffff8134f3bf RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000005 RBP: ffff8881ae7c7880 R08: ffff8881d4844980 R09: ffffed103b646aa9 R10: ffffed103b646aa8 R11: ffff8881db235547 R12: 0000000000000000 R13: 0000000000000001 R14: ffff8881d59ce0c0 R15: ffff8881db333e00 FS: 0000000000000000(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c420133c80 CR3: 0000000007021000 CR4: 00000000001406e0 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+0xa83/0x2c80 kernel/exit.c:788 do_group_exit+0x125/0x340 kernel/exit.c:899 get_signal+0x480/0x2470 kernel/signal.c:2739 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: 0033:0x45acf0 Code: Bad RIP value. RSP: 002b:00007ffe86856c48 EFLAGS: 00000246 ORIG_RAX: 0000000000000023 RAX: fffffffffffffdfc RBX: 0000000000027930 RCX: 000000000045acf0 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007ffe86856c50 RBP: 0000000000000094 R08: 0000000000000001 R09: 00000000018f5940 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe86856ca0 R14: 0000000000027930 R15: 00007ffe86856cb0 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:__sanitizer_cov_trace_pc+0x49/0x60 kernel/kcov.c:203 Code: 74 34 80 b8 d4 12 00 00 00 74 2b 8b 90 b0 12 00 00 83 fa 02 75 20 48 8b 88 b8 12 00 00 8b 80 b4 12 00 00 48 8b 11 48 83 c2 01 <48> 39 d0 76 07 48 89 34 d1 48 89 11 c3 66 2e 0f 1f 84 00 00 00 00 RSP: 0018:ffff8881db209a40 EFLAGS: 00000016 RAX: 0000000000040000 RBX: ffffed1038f209c4 RCX: ffffc90000022000 RDX: 0000000000040000 RSI: ffffffff84ba1bee RDI: 0000000000000001 RBP: ffff8881c7904dd0 R08: ffffffff8702cc40 R09: ffffed1039b73f81 R10: ffffed1039b73f80 R11: ffff8881cdb9fc00 R12: ffff8881cdb9e8a0 R13: dffffc0000000000 R14: ffffed1038f209c5 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fff2c680ff8 CR3: 00000001ae771000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: line6_data_received+0x2fe/0x520 sound/usb/line6/driver.c:305 __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