INFO: task syz.0.3552:23095 blocked for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.3552      state:D stack:24872 pid:23095 tgid:23094 ppid:15845  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x1139/0x6150 kernel/sched/core.c:6863
 __schedule_loop kernel/sched/core.c:6945 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:6960
 kvm_swap_active_memslots+0x2ea/0x7d0 virt/kvm/kvm_main.c:1643
 kvm_activate_memslot virt/kvm/kvm_main.c:1787 [inline]
 kvm_create_memslot virt/kvm/kvm_main.c:1853 [inline]
 kvm_set_memslot+0xd84/0x1450 virt/kvm/kvm_main.c:1965
 kvm_set_memory_region+0xe4a/0x15e0 virt/kvm/kvm_main.c:2121
 kvm_set_internal_memslot+0x9f/0xe0 virt/kvm/kvm_main.c:2144
 __x86_set_memory_region+0x2f6/0x740 arch/x86/kvm/x86.c:13278
 kvm_alloc_apic_access_page+0xc5/0x140 arch/x86/kvm/lapic.c:2806
 vmx_vcpu_create+0x503/0xbd0 arch/x86/kvm/vmx/vmx.c:7646
 kvm_arch_vcpu_create+0x688/0xb20 arch/x86/kvm/x86.c:12726
 kvm_vm_ioctl_create_vcpu virt/kvm/kvm_main.c:4208 [inline]
 kvm_vm_ioctl+0x105e/0x4090 virt/kvm/kvm_main.c:5165
 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+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdbc038f7c9
RSP: 002b:00007fdbc12d5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fdbc05e5fa0 RCX: 00007fdbc038f7c9
RDX: 0000000000000003 RSI: 000000000000ae41 RDI: 0000000000000003
RBP: 00007fdbc0413f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fdbc05e6038 R14: 00007fdbc05e5fa0 R15: 00007fffc4f031e8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/31:
 #0: ffffffff8e3c94a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #0: ffffffff8e3c94a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
 #0: ffffffff8e3c94a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6775
4 locks held by kworker/0:4/5917:
1 lock held by syz.7.3545/23063:
2 locks held by syz.0.3552/23095:
 #0: ffff88805bac00a8 (&kvm->slots_lock){+.+.}-{4:4}, at: class_mutex_constructor include/linux/mutex.h:253 [inline]
 #0: ffff88805bac00a8 (&kvm->slots_lock){+.+.}-{4:4}, at: kvm_alloc_apic_access_page+0x27/0x140 arch/x86/kvm/lapic.c:2800
 #1: ffff88805bac0138 (&kvm->slots_arch_lock){+.+.}-{4:4}, at: kvm_set_memslot+0x34/0x1450 virt/kvm/kvm_main.c:1916
4 locks held by syz.8.4035/25384:
1 lock held by syz.1.4034/25380:
1 lock held by syz.1.4034/25382:
2 locks held by syz.9.4033/25390:
2 locks held by syz.6.4036/25391:

=============================================

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 __sys_info lib/sys_info.c:157 [inline]
 sys_info+0x133/0x180 lib/sys_info.c:165
 check_hung_uninterruptible_tasks kernel/hung_task.c:346 [inline]
 watchdog+0xe66/0x1180 kernel/hung_task.c:515
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>