kthread+0x346/0x3d0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 watchdog: BUG: soft lockup - CPU#0 stuck for 123s! [syz.5.3025:11952] Modules linked in: CPU: 0 PID: 11952 Comm: syz.5.3025 Tainted: G W 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+0x1f5/0x470 kernel/smp.c:517 Code: 48 44 89 f6 83 e6 01 31 ff e8 c7 6f 0a 00 41 83 e6 01 49 bc 00 00 00 00 00 fc ff df 75 0a e8 02 6c 0a 00 e9 a9 00 00 00 f3 90 44 24 48 01 00 00 00 0f 84 94 00 00 00 e8 e8 6b 0a 00 eb e9 e8 RSP: 0018:ffffc90000f877e0 EFLAGS: 00000293 RAX: ffffffff81593898 RBX: 0000000000000000 RCX: ffff8881240f3b40 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90000f878d0 R08: dffffc0000000000 R09: ffffed103ee2aec9 R10: ffffed103ee2aec9 R11: 1ffff1103ee2aec8 R12: dffffc0000000000 R13: 0000000000000001 R14: 0000000000000001 R15: 1ffff920001f0f00 FS: 0000555571f4e500(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30f24000 CR3: 0000000121f9d000 CR4: 00000000003526b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: smp_call_function_many_cond+0x8f2/0x9e0 kernel/smp.c:653 smp_call_function_many kernel/smp.c:716 [inline] smp_call_function kernel/smp.c:738 [inline] on_each_cpu+0xab/0x170 kernel/smp.c:837 text_poke_sync arch/x86/kernel/alternative.c:1568 [inline] text_poke_bp_batch+0x1c4/0x580 arch/x86/kernel/alternative.c:1768 text_poke_flush arch/x86/kernel/alternative.c:1959 [inline] text_poke_finish+0x1a/0x30 arch/x86/kernel/alternative.c:1966 arch_jump_label_transform_apply+0x15/0x30 arch/x86/kernel/jump_label.c:126 __jump_label_update+0x37c/0x3a0 kernel/jump_label.c:459 jump_label_update+0x34c/0x3e0 kernel/jump_label.c:825 __static_key_slow_dec_cpuslocked+0xf7/0x150 kernel/jump_label.c:248 __static_key_slow_dec kernel/jump_label.c:255 [inline] static_key_slow_dec+0x45/0x90 kernel/jump_label.c:270 kvm_arch_vcpu_destroy+0x263/0x270 arch/x86/kvm/x86.c:10374 kvm_vcpu_destroy+0x21/0xb0 virt/kvm/kvm_main.c:464 kvm_free_vcpus arch/x86/kvm/x86.c:10717 [inline] kvm_arch_destroy_vm+0x447/0x740 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 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop+0xcb/0xe0 kernel/entry/common.c:172 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: 0033:0x7fe683b5c749 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffc34370618 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007fe683db4da0 RCX: 00007fe683b5c749 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007fe683db4da0 R08: 00000000000000fc R09: 0000000e3437090f R10: 00007fe683db4cb0 R11: 0000000000000246 R12: 00000000000717e2 R13: 00007fe683db3090 R14: ffffffffffffffff R15: 00007ffc34370730 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 11950 Comm: syz.9.3024 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:vgadev_find drivers/gpu/vga/vgaarb.c:135 [inline] RIP: 0010:vga_put drivers/gpu/vga/vgaarb.c:579 [inline] RIP: 0010:vga_arb_release+0x242/0x930 drivers/gpu/vga/vgaarb.c:1370 Code: 86 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 31 d4 f3 fe 4d 8b 36 49 81 fe c0 af 61 86 74 26 49 8d 5e 10 48 89 d8 <48> c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 0b d4 f3 fe 4c 3b 23 RSP: 0018:ffffc90000e678c8 EFLAGS: 00000083 RAX: ffff888105bfc110 RBX: ffff888105bfc110 RCX: 0000000000000001 RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc90000e67820 RBP: ffffc90000e67950 R08: 0000000000000004 R09: 0000000000000003 R10: fffff520001ccf04 R11: 1ffff920001ccf04 R12: ffff888105bb0000 R13: ffff888100bcec18 R14: ffff888105bfc100 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200001000000 CR3: 0000000107dbe000 CR4: 00000000003526a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __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+0xa4f/0x2480 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+0xbf/0x10f0 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: 0033:0x7f60467e0749 Code: Unable to access opcode bytes at RIP 0x7f60467e071f. RSP: 002b:00007f6045227038 EFLAGS: 00000246 ORIG_RAX: 000000000000012b RAX: 000000000000033b RBX: 00007f6046a37090 RCX: 00007f60467e0749 RDX: 03fffffffffffeda RSI: 00002000000000c0 RDI: 0000000000000008 RBP: 00007f6046864f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f6046a37128 R14: 00007f6046a37090 R15: 00007fff165e3938