起動時に実行するのに120秒以上かかるシミュレーションハードウェアデバイスがあります。私はいつも次のメッセージを受け取ります。
[ 242.914490] INFO: task kworker/u8:0:9 blocked for more than 120 seconds.
[ 242.914512] Not tainted 5.15.0-78-generic #85-Ubuntu
[ 242.914530] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 242.914553] task:kworker/u8:0 state:D stack: 0 pid: 9 ppid: 2 flags:0x00004000
[ 242.914583] Workqueue: events_unbound async_run_entry_fn
[ 242.914606] Call Trace:
[ 242.914616] <TASK>
[ 242.914628] __schedule+0x24e/0x590
[ 242.914649] schedule+0x69/0x110
[ 242.914669] schedule_timeout+0x103/0x140
[ 242.914690] __wait_for_common+0xae/0x150
[ 242.914712] ? usleep_range_state+0x90/0x90
[ 242.914733] wait_for_completion+0x24/0x30
[ 242.914755] __flush_work.isra.0+0x175/0x280
[ 242.914774] ? ttwu_do_wakeup+0x1c/0x170
[ 242.914795] ? worker_detach_from_pool+0xc0/0xc0
[ 242.914820] flush_work+0xe/0x20
[ 242.914837] nvme_async_probe+0x19/0x40 [nvme]
[ 242.914870] async_run_entry_fn+0x33/0x120
[ 242.914891] process_one_work+0x22b/0x3d0
[ 242.914911] worker_thread+0x53/0x420
[ 242.914929] ? process_one_work+0x3d0/0x3d0
[ 242.914949] kthread+0x12a/0x150
[ 242.914968] ? set_kthread_struct+0x50/0x50
[ 242.914990] ret_from_fork+0x22/0x30
[ 242.915014] </TASK>
[ 242.915025] INFO: task kworker/u8:1:101 blocked for more than 120 seconds.
[ 242.915047] Not tainted 5.15.0-78-generic #85-Ubuntu
[ 242.915066] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 242.915088] task:kworker/u8:1 state:D stack: 0 pid: 101 ppid: 2 flags:0x00004000
[ 242.915118] Workqueue: events_unbound async_run_entry_fn
[ 242.915141] Call Trace:
[ 242.915152] <TASK>
[ 242.915163] __schedule+0x24e/0x590
[ 242.915183] ? __schedule+0x256/0x590
[ 242.915205] schedule+0x69/0x110
[ 242.915224] async_synchronize_cookie_domain+0xd0/0x110
[ 242.915248] ? wait_woken+0x70/0x70
[ 242.915267] async_synchronize_cookie+0x15/0x20
[ 242.915289] async_port_probe+0x4e/0x80
[ 242.915310] async_run_entry_fn+0x33/0x120
[ 242.915331] process_one_work+0x22b/0x3d0
[ 242.915351] worker_thread+0x53/0x420
[ 242.915369] ? process_one_work+0x3d0/0x3d0
[ 242.915389] kthread+0x12a/0x150
[ 242.915408] ? set_kthread_struct+0x50/0x50
[ 242.915430] ret_from_fork+0x22/0x30
[ 242.915454] </TASK>
[ 242.915464] INFO: task kworker/u8:3:116 blocked for more than 120 seconds.
[ 242.915486] Not tainted 5.15.0-78-generic #85-Ubuntu
[ 242.915505] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 242.915527] task:kworker/u8:3 state:D stack: 0 pid: 116 ppid: 2 flags:0x00004000
[ 242.915557] Workqueue: events_unbound async_run_entry_fn
[ 242.915580] Call Trace:
[ 242.915591] <TASK>
[ 242.915602] __schedule+0x24e/0x590
[ 242.915622] ? __schedule+0x256/0x590
[ 242.915644] schedule+0x69/0x110
[ 242.915663] async_synchronize_cookie_domain+0xd0/0x110
[ 242.915687] ? wait_woken+0x70/0x70
[ 242.915706] async_synchronize_cookie+0x15/0x20
[ 242.915728] async_port_probe+0x4e/0x80
[ 242.915749] async_run_entry_fn+0x33/0x120
[ 242.915770] process_one_work+0x22b/0x3d0
[ 242.915790] worker_thread+0x53/0x420
[ 242.915808] ? process_one_work+0x3d0/0x3d0
[ 242.915828] kthread+0x12a/0x150
[ 242.915847] ? set_kthread_struct+0x50/0x50
[ 242.915869] ret_from_fork+0x22/0x30
[ 242.915893] </TASK>
このメッセージを無効にしたかったので、sysctl.confを修正して追加しましsudo vi /etc/sysctl.confたkernel.hung_task_timeout_secs = 0。実行すると、cat /proc/sys/kernel/hung_task_timeout_secsゼロ値が返されます。また、メッセージを避けるために grub で udev.event_timeout を増やしました。しかし、それらのどれも動作しません。システムを再起動すると、常に同じメッセージが表示されます。 QEMUで実行されているUbuntu 22.04.3 LTSクラウドサーバーを使用しています。これは私が使用しているQEMUコマンドです：
qemu-system-x86_64 -M q35,accel=tcg,kernel-irqchip=split -m 4G -smp 4 \
-device virtio-net-pci,netdev=net0 -net nic -netdev type=user,id=net0,hostfwd=tcp::2222-:22 \
-serial mon:stdio \
-device intel-iommu,intremap=on,device-iotlb=on \
-drive if=virtio,file=jammy-server-cloudimg-amd64.img,format=qcow2 \
-drive if=virtio,file=user-data.img,format=raw
理由をご存知ですか？これらのメッセージを永久に無効にする方法はありますか？みんなありがとうございます！