------------[ cut here ]------------ pvqspinlock: lock 0xffff888034ea8790 has corrupted value 0x0! WARNING: kernel/locking/qspinlock_paravirt.h:504 at __pv_queued_spin_unlock_slowpath+0x220/0x2e0 kernel/locking/qspinlock_paravirt.h:504, CPU#1: syz.2.1308/11206 Modules linked in: CPU: 1 UID: 0 PID: 11206 Comm: syz.2.1308 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:__pv_queued_spin_unlock_slowpath+0x223/0x2e0 kernel/locking/qspinlock_paravirt.h:504 Code: fc ff df 48 c1 ea 03 0f b6 14 02 4c 89 e0 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 4d 41 8b 14 24 48 8d 3d 40 00 44 05 4c 89 e6 <67> 48 0f b9 3a e9 2f ff ff ff 48 89 df 48 89 14 24 e8 17 07 e0 f6 RSP: 0018:ffffc9000c3e73a0 EFLAGS: 00010246 RAX: 0000000000000003 RBX: ffff888034ea8790 RCX: ffffffff8b99c87f RDX: 0000000000000000 RSI: ffff888034ea8790 RDI: ffffffff90ddc8f0 RBP: ffff888034ea8798 R08: 0000000000000000 R09: ffffed10069d50f2 R10: ffff888034ea8793 R11: 0000000000000000 R12: ffff888034ea8790 R13: ffff888034ea8000 R14: 0000000000000000 R15: ffff888034ea87d0 FS: 00007fa8e5caa6c0(0000) GS:ffff8880d6418000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000002d142000 CR4: 0000000000352ef0 Call Trace: __raw_callee_save___pv_queued_spin_unlock_slowpath+0x15/0x40 .slowpath+0x9/0x18 pv_queued_spin_unlock arch/x86/include/asm/paravirt-spinlock.h:40 [inline] queued_spin_unlock arch/x86/include/asm/paravirt-spinlock.h:72 [inline] do_raw_spin_unlock+0x145/0x1e0 kernel/locking/spinlock_debug.c:142 __raw_spin_unlock include/linux/spinlock_api_smp.h:168 [inline] _raw_spin_unlock+0x1e/0x50 kernel/locking/spinlock.c:190 spin_unlock include/linux/spinlock.h:390 [inline] hv_tlb_flush_enqueue.isra.0+0x195/0x200 arch/x86/kvm/hyperv.c:1967 kvm_hv_flush_tlb+0x17b4/0x1ae0 arch/x86/kvm/hyperv.c:2150 kvm_hv_hypercall+0xd0b/0x2350 arch/x86/kvm/hyperv.c:2629 kvm_emulate_hypercall+0x115/0x3c0 arch/x86/kvm/x86.c:10510 __vmx_handle_exit arch/x86/kvm/vmx/vmx.c:6848 [inline] vmx_handle_exit+0x4d6/0x1ef0 arch/x86/kvm/vmx/vmx.c:6858 vcpu_enter_guest arch/x86/kvm/x86.c:11550 [inline] vcpu_run+0x3558/0x5d50 arch/x86/kvm/x86.c:11707 kvm_arch_vcpu_ioctl_run+0x5b6/0x1890 arch/x86/kvm/x86.c:12062 kvm_vcpu_ioctl+0x730/0x1700 virt/kvm/kvm_main.c:4470 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa8e4d9ce59 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fa8e5caa028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fa8e5015fa0 RCX: 00007fa8e4d9ce59 RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000006 RBP: 00007fa8e4e32e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa8e5016038 R14: 00007fa8e5015fa0 R15: 00007ffbffffecb8 ---------------- Code disassembly (best guess), 3 bytes skipped: 0: 48 c1 ea 03 shr $0x3,%rdx 4: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx 8: 4c 89 e0 mov %r12,%rax b: 83 e0 07 and $0x7,%eax e: 83 c0 03 add $0x3,%eax 11: 38 d0 cmp %dl,%al 13: 7c 04 jl 0x19 15: 84 d2 test %dl,%dl 17: 75 4d jne 0x66 19: 41 8b 14 24 mov (%r12),%edx 1d: 48 8d 3d 40 00 44 05 lea 0x5440040(%rip),%rdi # 0x5440064 24: 4c 89 e6 mov %r12,%rsi * 27: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2c: e9 2f ff ff ff jmp 0xffffff60 31: 48 89 df mov %rbx,%rdi 34: 48 89 14 24 mov %rdx,(%rsp) 38: e8 17 07 e0 f6 call 0xf6e00754