watchdog: BUG: soft lockup - CPU#1 stuck for 123s! [syz-executor.2:1815] Modules linked in: irq event stamp: 1263714 hardirqs last enabled at (1263713): [] trace_hardirqs_on_thunk+0x1a/0x1c arch/x86/entry/thunk_64.S:41 hardirqs last disabled at (1263714): [] trace_hardirqs_off_thunk+0x1a/0x1c arch/x86/entry/thunk_64.S:42 softirqs last enabled at (1243030): [] __do_softirq+0x673/0x950 kernel/softirq.c:319 softirqs last disabled at (1243001): [] invoke_softirq kernel/softirq.c:373 [inline] softirqs last disabled at (1243001): [] irq_exit+0x178/0x1a0 kernel/softirq.c:413 CPU: 1 PID: 1815 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: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:ffff8881afa677a0 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffff8881cd949880 RBX: 0000000000000003 RCX: ffffffff8134f3bf RDX: 0000000000000000 RSI: ffffffff8134f3ad RDI: 0000000000000005 RBP: ffff8881afa67880 R08: ffff8881cd949880 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000001 R14: ffff8881ce0f1940 R15: ffff8881db333e00 FS: 0000000000000000(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f82b887d000 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+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: 0033:0x41668a Code: Bad RIP value. RSP: 002b:00007ffc39109168 EFLAGS: 00000246 ORIG_RAX: 000000000000003d RAX: fffffffffffffe00 RBX: 0000000000000000 RCX: 000000000041668a RDX: 0000000040000000 RSI: 00007ffc391091a0 RDI: ffffffffffffffff RBP: 0000000000000043 R08: 0000000000000001 R09: 0000000001243940 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000000a R13: 00007ffc391091a0 R14: 0000000000019486 R15: 00007ffc391091b0 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_cmp4+0x8/0x20 kernel/kcov.c:258 Code: 00 00 48 8b 0c 24 0f b7 d6 0f b7 f7 bf 02 00 00 00 e9 4c ff ff ff 66 90 66 2e 0f 1f 84 00 00 00 00 00 48 8b 0c 24 89 f2 89 fe 04 00 00 00 e9 2e ff ff ff 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 RSP: 0018:ffff8881db2099d8 EFLAGS: 00000046 RAX: 0000000000040000 RBX: 0000000000000000 RCX: ffffffff84ba5e13 RDX: 00000000000003d0 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff8881d34960a0 R08: ffffffff8702cc40 R09: ffffed103a692f81 R10: ffffed103a692f80 R11: ffff8881d3497c00 R12: 0000000000000001 R13: 0000000000000030 R14: 00000000000003d0 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2d127000 CR3: 00000001af9f8000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: line6_midibuf_read+0x473/0xa30 sound/usb/line6/midibuf.c:213 line6_data_received+0x318/0x520 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:tick_nohz_idle_exit+0x10f/0x1f0 kernel/time/tick-sched.c:1199 Code: 41 c0 ed 02 83 e3 01 41 83 e5 01 45 89 ee 41 09 de 44 89 f6 e8 b2 76 0b 00 45 84 f6 75 14 e8 48 75 0b 00 e8 43 be 10 00 fb 5b <5d> 41 5c 41 5d 41 5e c3 e8 34 75 0b 00 e8 5f 27 fd ff 31 ff 44 89 RSP: 0018:ffffffff87007d88 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: ffffffff8702cc40 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000006 RDI: ffffffff8702d48c RBP: ffff8881db228be0 R08: ffffffff8702cc40 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881db228c2c R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff8702cc40 do_idle+0x2b9/0x500 kernel/sched/idle.c:282 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