kthread+0x346/0x3d0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
watchdog: BUG: soft lockup - CPU#1 stuck for 123s! [syz.7.698:2768]
Modules linked in:
CPU: 1 PID: 2768 Comm: syz.7.698 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:csd_lock_wait kernel/smp.c:229 [inline]
RIP: 0010:smp_call_function_single+0x209/0x490 kernel/smp.c:517
Code: 48 44 89 f6 83 e6 01 31 ff e8 13 88 0a 00 41 83 e6 01 49 bc 00 00 00 00 00 fc ff df 75 0a e8 4e 84 0a 00 e9 a4 00 00 00 f3 90 <f7> 44 24 48 01 00 00 00 0f 84 8f 00 00 00 e8 34 84 0a 00 eb e9 e8
RSP: 0018:ffffc90000fcf620 EFLAGS: 00000293
RAX: ffffffff815a319c RBX: 0000000000000000 RCX: ffff88811552a780
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000fcf710 R08: ffff8881f7057647 R09: 1ffff1103ee0aec8
R10: dffffc0000000000 R11: ffffed103ee0aec9 R12: dffffc0000000000
R13: 0000000000000001 R14: 0000000000000001 R15: 1ffff920001f9ec8
FS:  0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3575cdc000 CR3: 0000000122891000 CR4: 00000000003526a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 loaded_vmcs_clear arch/x86/kvm/vmx/vmx.c:817 [inline]
 vmx_vcpu_load_vmcs+0xd6/0x810 arch/x86/kvm/vmx/vmx.c:1413
 vmx_vcpu_load+0x1f/0x90 arch/x86/kvm/vmx/vmx.c:1483
 kvm_arch_vcpu_load+0x12c/0x740 arch/x86/kvm/x86.c:4067
 vcpu_load+0x55/0x90 virt/kvm/kvm_main.c:206
 kvm_unload_vcpu_mmu arch/x86/kvm/x86.c:10699 [inline]
 kvm_free_vcpus arch/x86/kvm/x86.c:10714 [inline]
 kvm_arch_destroy_vm+0x2bd/0x740 arch/x86/kvm/x86.c:10812
 kvm_destroy_vm virt/kvm/kvm_main.c:946 [inline]
 kvm_put_kvm+0x8fe/0x10d0 virt/kvm/kvm_main.c:968
 kvm_vm_release+0x46/0x50 virt/kvm/kvm_main.c:991
 __fput+0x2fb/0x770 fs/file_table.c:281
 ____fput+0x15/0x20 fs/file_table.c:314
 task_work_run+0x127/0x190 kernel/task_work.c:189
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0xa90/0x2500 kernel/exit.c:872
 do_group_exit+0x141/0x310 kernel/exit.c:986
 get_signal+0xf7d/0x12e0 kernel/signal.c:2793
 arch_do_signal_or_restart+0xe2/0x11d0 arch/x86/kernel/signal.c:805
 handle_signal_work kernel/entry/common.c:145 [inline]
 exit_to_user_mode_loop+0xa2/0xe0 kernel/entry/common.c:169
 exit_to_user_mode_prepare+0x76/0xa0 kernel/entry/common.c:199
 syscall_exit_to_user_mode+0x1d/0x40 kernel/entry/common.c:274
 do_syscall_64+0x3d/0x40 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f7c74fe6cb9
Code: Unable to access opcode bytes at RIP 0x7f7c74fe6c8f.
RSP: 002b:00007f7c73a220e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f7c75262098 RCX: 00007f7c74fe6cb9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f7c75262098
RBP: 00007f7c75262090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7c75262128 R14: 00007ffc51d68110 R15: 00007ffc51d681f8
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 2786 Comm: syz.1.704 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:preempt_count_add+0x32/0x1b0 kernel/sched/core.c:4456
Code: 53 49 bf 00 00 00 00 00 fc ff df 48 c7 c0 c0 f8 e7 86 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 01 01 00 00 83 3d be 28 a3 05 00 <75> 07 65 8b 05 81 9d bd 7e 65 01 3d 7a 9d bd 7e 48 c7 c0 c0 f8 e7
RSP: 0018:ffffc9000102f978 EFLAGS: 00000046
RAX: 0000000000000004 RBX: ffffffff86f0efe0 RCX: ffffffff86e7f803
RDX: 0000000000000000 RSI: 0000000000000802 RDI: 0000000000000001
RBP: ffffc9000102f990 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000205f38 R12: 1ffff92000205f34
R13: dffffc0000000000 R14: 0000000000000802 R15: dffffc0000000000
FS:  00007fb62f4586c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30621ff8 CR3: 0000000119f2a000 CR4: 00000000003526b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:109 [inline]
 _raw_spin_lock_irqsave+0x9a/0x130 kernel/locking/spinlock.c:159
 vga_put drivers/gpu/vga/vgaarb.c:578 [inline]
 vga_arb_release+0x20e/0x930 drivers/gpu/vga/vgaarb.c:1370
 __fput+0x2fb/0x770 fs/file_table.c:281
 ____fput+0x15/0x20 fs/file_table.c:314
 task_work_run+0x127/0x190 kernel/task_work.c:189
 get_signal+0x125a/0x12e0 kernel/signal.c:2566
 arch_do_signal_or_restart+0xe2/0x11d0 arch/x86/kernel/signal.c:805
 handle_signal_work kernel/entry/common.c:145 [inline]
 exit_to_user_mode_loop+0xa2/0xe0 kernel/entry/common.c:169
 exit_to_user_mode_prepare+0x76/0xa0 kernel/entry/common.c:199
 syscall_exit_to_user_mode+0x1d/0x40 kernel/entry/common.c:274
 do_syscall_64+0x3d/0x40 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7fb630a1ccb9
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:00007fb62f458028 EFLAGS: 00000246 ORIG_RAX: 000000000000010f
RAX: 0000000000000002 RBX: 00007fb630c98090 RCX: 00007fb630a1ccb9
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00002000000000c0
RBP: 00007fb630a8abf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb630c98128 R14: 00007fb630c98090 R15: 00007ffc7ff9a048