watchdog: BUG: soft lockup - CPU#1 stuck for 23s! [syz-executor.4:18157] Modules linked in: irq event stamp: 4900687 hardirqs last enabled at (4900686): [] trace_hardirqs_on_thunk+0x1a/0x1c hardirqs last disabled at (4900687): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (4139402): [] __do_softirq+0x678/0x980 kernel/softirq.c:318 softirqs last disabled at (4139405): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (4139405): [] irq_exit+0x215/0x260 kernel/softirq.c:412 CPU: 1 PID: 18157 Comm: syz-executor.4 Not tainted 4.19.206-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline] RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xa3/0xe0 kernel/locking/spinlock.c:184 Code: 48 c7 c0 c8 82 f1 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 2f 48 83 3d fc 5e d8 01 00 74 15 48 89 df 57 9d <0f> 1f 44 00 00 eb b2 e8 3b 19 e7 f8 eb c0 0f 0b 0f 0b 48 c7 c7 c8 RSP: 0018:ffff8880ba107c28 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff13e3059 RBX: 0000000000000286 RCX: 1ffff110408f113d RDX: dffffc0000000000 RSI: ffff8882047889c8 RDI: 0000000000000286 RBP: ffff8880ba122b40 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000022b40 R14: 0000000000000000 R15: ffff8880ba122b40 FS: 00007f31a41d4700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f08fad54718 CR3: 0000000207079000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __mod_timer kernel/time/timer.c:1071 [inline] mod_timer+0x4ea/0x1010 kernel/time/timer.c:1114 call_timer_fn+0x177/0x700 kernel/time/timer.c:1338 expire_timers+0x243/0x4e0 kernel/time/timer.c:1375 __run_timers kernel/time/timer.c:1696 [inline] run_timer_softirq+0x21c/0x670 kernel/time/timer.c:1709 __do_softirq+0x265/0x980 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x215/0x260 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1098 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:kvm_kick_cpu+0x66/0x80 arch/x86/kernel/kvm.c:775 Code: df 48 89 da 48 c1 ea 03 0f b6 14 02 48 89 d8 83 e0 07 83 c0 01 38 d0 7c 04 84 d2 75 10 0f b7 0b b8 05 00 00 00 31 db 0f 01 c1 <5b> 5d c3 48 89 df e8 8f 5e 6f 00 eb e6 e8 a8 5f 6f 00 eb b1 66 0f RSP: 0018:ffff8881fea27900 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffffffff89cf9f00 RBP: 0000000000000000 R08: 0000000000000000 R09: fffff5200018f121 R10: ffffc90000c7890b R11: 0000000000000000 R12: ffffc90000c78908 R13: 00000000000000ff R14: dffffc0000000000 R15: ffff88823ffee040 pv_kick arch/x86/include/asm/paravirt.h:694 [inline] __pv_queued_spin_unlock_slowpath+0x167/0x270 kernel/locking/qspinlock_paravirt.h:534 __raw_callee_save___pv_queued_spin_unlock_slowpath+0x11/0x20 .slowpath+0x9/0xe pv_queued_spin_unlock arch/x86/include/asm/paravirt.h:684 [inline] queued_spin_unlock arch/x86/include/asm/qspinlock.h:58 [inline] do_raw_spin_unlock+0x171/0x230 kernel/locking/spinlock_debug.c:135 __raw_spin_unlock include/linux/spinlock_api_smp.h:151 [inline] _raw_spin_unlock+0x1f/0x40 kernel/locking/spinlock.c:176 spin_unlock include/linux/spinlock.h:369 [inline] queue_me kernel/futex.c:2374 [inline] futex_wait_queue_me+0x1f3/0x5e0 kernel/futex.c:2705 futex_wait+0x1ef/0x610 kernel/futex.c:2837 do_futex+0x268/0x1880 kernel/futex.c:3889 __do_sys_futex kernel/futex.c:3950 [inline] __se_sys_futex+0x28f/0x3b0 kernel/futex.c:3918 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4665f9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f31a41d4218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 000000000056bf88 RCX: 00000000004665f9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000056bf88 RBP: 000000000056bf80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf8c R13: 00007ffe4cb12edf R14: 00007f31a41d4300 R15: 0000000000022000 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 18127 Comm: syz-executor.4 Not tainted 4.19.206-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:261 [inline] RIP: 0010:csd_lock_wait kernel/smp.c:108 [inline] RIP: 0010:smp_call_function_single+0x1db/0x420 kernel/smp.c:302 Code: 00 e8 a9 03 0a 00 48 8b 4c 24 08 48 8b 54 24 10 48 8d 74 24 40 8b 7c 24 1c e8 a1 f9 ff ff 41 89 c5 eb 07 e8 87 03 0a 00 f3 90 <44> 8b 64 24 58 31 ff 41 83 e4 01 44 89 e6 e8 e2 04 0a 00 45 85 e4 RSP: 0018:ffff8882023f7720 EFLAGS: 00000293 RAX: ffff888209f88080 RBX: 1ffff1104047eee8 RCX: ffffffff81588f4e RDX: 0000000000000000 RSI: ffffffff81588f39 RDI: 0000000000000005 RBP: ffff8882023f7800 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000002 FS: 0000000001d3a400(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000265d848 CR3: 0000000207079000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: smp_call_function_many+0x743/0x8d0 kernel/smp.c:434 flush_tlb_others arch/x86/include/asm/paravirt.h:309 [inline] flush_tlb_mm_range+0x179/0x320 arch/x86/mm/tlb.c:728 change_protection_range+0x1bec/0x1fd0 mm/mprotect.c:323 change_protection+0xa9/0xc0 mm/mprotect.c:338 change_prot_numa+0x2f/0x80 mm/mempolicy.c:599 task_numa_work+0x51c/0xac0 kernel/sched/fair.c:2642 task_work_run+0x148/0x1c0 kernel/task_work.c:113 get_signal+0x1b64/0x1f70 kernel/signal.c:2400 do_signal+0x8f/0x1670 arch/x86/kernel/signal.c:799 exit_to_usermode_loop+0x204/0x2a0 arch/x86/entry/common.c:163 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4665f9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe4cb12f58 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000001 RBX: 0000000000000004 RCX: 00000000004665f9 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 000000000056bf88 RBP: 000000000056bf80 R08: 0000000000570ba0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000571890 R13: 00007ffe4cb13060 R14: 000000000056bf80 R15: 00000000001ed1ba ---------------- Code disassembly (best guess): 0: 48 c7 c0 c8 82 f1 89 mov $0xffffffff89f182c8,%rax 7: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx e: fc ff df 11: 48 c1 e8 03 shr $0x3,%rax 15: 80 3c 10 00 cmpb $0x0,(%rax,%rdx,1) 19: 75 2f jne 0x4a 1b: 48 83 3d fc 5e d8 01 cmpq $0x0,0x1d85efc(%rip) # 0x1d85f1f 22: 00 23: 74 15 je 0x3a 25: 48 89 df mov %rbx,%rdi 28: 57 push %rdi 29: 9d popfq * 2a: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) <-- trapping instruction 2f: eb b2 jmp 0xffffffe3 31: e8 3b 19 e7 f8 callq 0xf8e71971 36: eb c0 jmp 0xfffffff8 38: 0f 0b ud2 3a: 0f 0b ud2 3c: 48 rex.W 3d: c7 .byte 0xc7 3e: c7 (bad) 3f: c8 .byte 0xc8