INFO: task syz.1.227:7295 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.1.227 state:D stack:25688 pid:7295 tgid:7294 ppid:5830 task_flags:0x400140 flags:0x00080002
Call Trace:
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:1802 [inline]
kvm_create_memslot virt/kvm/kvm_main.c:1868 [inline]
kvm_set_memslot+0xd70/0x15c0 virt/kvm/kvm_main.c:1980
kvm_set_memory_region+0xe4a/0x15e0 virt/kvm/kvm_main.c:2136
kvm_set_internal_memslot+0x9f/0xe0 virt/kvm/kvm_main.c:2159
__x86_set_memory_region+0x2f6/0x740 arch/x86/kvm/x86.c:13285
kvm_alloc_apic_access_page+0xc5/0x140 arch/x86/kvm/lapic.c:2806
vmx_vcpu_create+0x503/0xbd0 arch/x86/kvm/vmx/vmx.c:7637
kvm_arch_vcpu_create+0x688/0xb20 arch/x86/kvm/x86.c:12733
kvm_vm_ioctl_create_vcpu virt/kvm/kvm_main.c:4223 [inline]
kvm_vm_ioctl+0x105e/0x4090 virt/kvm/kvm_main.c:5180
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: 0033:0x7f7b2258f7c9
RSP: 002b:00007f7b234d3038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f7b227e5fa0 RCX: 00007f7b2258f7c9
RDX: 0000000000000000 RSI: 000000000000ae41 RDI: 0000000000000003
RBP: 00007f7b22613f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7b227e6038 R14: 00007f7b227e5fa0 R15: 00007ffd5be99cc8
Showing all locks held in the system:
1 lock held by rcu_exp_gp_kthr/18:
#0: ffff8880b843add8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:639
1 lock held by khungtaskd/31:
#0: ffffffff8e3c9520 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e3c9520 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#0: ffffffff8e3c9520 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6775
2 locks held by getty/5586:
#0: ffff88814df940a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x41b/0x1510 drivers/tty/n_tty.c:2211
2 locks held by syz.1.227/7295:
#0: ffff88805aafc0a8 (&kvm->slots_lock){+.+.}-{4:4}, at: class_mutex_constructor include/linux/mutex.h:253 [inline]
#0: ffff88805aafc0a8 (&kvm->slots_lock){+.+.}-{4:4}, at: kvm_alloc_apic_access_page+0x27/0x140 arch/x86/kvm/lapic.c:2800
#1: ffff88805aafc138 (&kvm->slots_arch_lock){+.+.}-{4:4}, at: kvm_set_memslot+0x34/0x15c0 virt/kvm/kvm_main.c:1931
5 locks held by kworker/u11:1/8345:
#0: ffff8880283a7148 ((wq_completion)hci1){+.+.}-{0:0}, at: process_one_work+0x128d/0x1b20 kernel/workqueue.c:3232
#1: ffffc90003e8fc90 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_one_work+0x914/0x1b20 kernel/workqueue.c:3233
#2: ffff88802830cec0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_cmd_sync_work+0x175/0x470 net/bluetooth/hci_sync.c:331
#3: ffff88802830c0c0 (&hdev->lock){+.+.}-{4:4}, at: hci_abort_conn_sync+0x13f/0xb20 net/bluetooth/hci_sync.c:5702
#4: ffffffff8e3d4c78 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x1a3/0x3c0 kernel/rcu/tree_exp.h:343
2 locks held by kworker/u10:31/8445:
3 locks held by kworker/u10:36/8450:
#0: ffff88801badf148 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x128d/0x1b20 kernel/workqueue.c:3232
#1: ffffc90002f37c90 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x914/0x1b20 kernel/workqueue.c:3233
#2: ffffffff9012e890 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xad/0x830 net/core/net_namespace.c:670
2 locks held by syz.3.632/9715:
1 lock held by syz.3.632/9717:
5 locks held by syz.3.632/9718:
#0: ffff8880b843add8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:639
#1: ffff8880b8424608 (psi_seq){-.-.}-{0:0}, at: psi_sched_switch kernel/sched/stats.h:225 [inline]
#1: ffff8880b8424608 (psi_seq){-.-.}-{0:0}, at: __schedule+0x19b1/0x6150 kernel/sched/core.c:6857
#2: ffff88802bd397e8 (&(&sig->stats_lock)->lock){....}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline]
#2: ffff88802bd397e8 (&(&sig->stats_lock)->lock){....}-{3:3}, at: write_seqlock include/linux/seqlock.h:876 [inline]
#2: ffff88802bd397e8 (&(&sig->stats_lock)->lock){....}-{3:3}, at: __exit_signal kernel/exit.c:199 [inline]
#2: ffff88802bd397e8 (&(&sig->stats_lock)->lock){....}-{3:3}, at: release_task+0x4e1/0x1ab0 kernel/exit.c:265
#3: ffff88802bd397a0 (&____s->seqcount#6){....}-{0:0}, at: exit_notify kernel/exit.c:777 [inline]
#3: ffff88802bd397a0 (&____s->seqcount#6){....}-{0:0}, at: do_exit+0x12d1/0x2bd0 kernel/exit.c:983
#4: ffff888077f409b8 (&pid->wait_pidfd){....}-{3:3}, at: __wake_up_common_lock kernel/sched/wait.c:124 [inline]
#4: ffff888077f409b8 (&pid->wait_pidfd){....}-{3:3}, at: __wake_up+0x1c/0x60 kernel/sched/wait.c:146
2 locks held by syz.4.635/9739:
#0: ffffffff8f76f088 (mon_lock){+.+.}-{4:4}, at: mon_text_release+0x4e/0x3d0 drivers/usb/mon/mon_text.c:650
#1: ffffffff8e3d4b40 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x48/0x6e0 kernel/rcu/tree.c:3816
=============================================
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:
__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