我正在使用串行终端通过 USB ACM 与微控制器 (bluepill-STM32F103-genuine) 进行交互。通电后工作正常。但重置主板后，它会挂起我的系统，我只能使用 SysReq 序列重新启动。 （我已经修复了 bluepill USB 引脚上的错误电阻）。
悬挂是渐进的。首先风扇开始旋转，然后温度升高，然后 WiFi 关闭，然后操作系统完全冻结。
奇怪的是CPU使用率变成100%但没有进程使用那么多CPU！
这是重置时的journalctl：16:26
Nov 04 16:19:47 thinkpad rtkit-daemon[2845]: Supervising 6 threads of 4 processes of 1 users.
Nov 04 16:20:00 thinkpad rtkit-daemon[2845]: Supervising 5 threads of 3 processes of 1 users.
Nov 04 16:20:00 thinkpad rtkit-daemon[2845]: Supervising 5 threads of 3 processes of 1 users.
Nov 04 16:20:02 thinkpad rtkit-daemon[2845]: Supervising 5 threads of 3 processes of 1 users.
Nov 04 16:20:02 thinkpad rtkit-daemon[2845]: Supervising 5 threads of 3 processes of 1 users.
Nov 04 16:21:40 thinkpad rtkit-daemon[2845]: Supervising 5 threads of 3 processes of 1 users.
Nov 04 16:21:40 thinkpad rtkit-daemon[2845]: Supervising 5 threads of 3 processes of 1 users.
Nov 04 16:21:40 thinkpad rtkit-daemon[2845]: Supervising 5 threads of 3 processes of 1 users.
Nov 04 16:21:40 thinkpad rtkit-daemon[2845]: Supervising 5 threads of 3 processes of 1 users.
Nov 04 16:21:40 thinkpad rtkit-daemon[2845]: Successfully made thread 8675 of process 8588 (n/a) owned by '1000' RT at priority 10.
Nov 04 16:21:40 thinkpad rtkit-daemon[2845]: Supervising 6 threads of 4 processes of 1 users.
Nov 04 16:21:51 thinkpad rtkit-daemon[2845]: Supervising 6 threads of 4 processes of 1 users.
Nov 04 16:21:51 thinkpad rtkit-daemon[2845]: Supervising 6 threads of 4 processes of 1 users.
Nov 04 16:25:01 thinkpad CRON[9155]: pam_unix(cron:session): session opened for user root by (uid=0)
Nov 04 16:25:01 thinkpad CRON[9156]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
Nov 04 16:25:01 thinkpad CRON[9155]: pam_unix(cron:session): session closed for user root
Nov 04 16:26:06 thinkpad kernel: ------------[ cut here ]------------
Nov 04 16:26:06 thinkpad kernel: WARNING: CPU: 0 PID: 0 at /build/linux-hwe-5.4-P3jn7z/linux-hwe-5.4-5.4.0/kernel/workqueue.c:1477 __queue_work+0x35f/0x400
Nov 04 16:26:06 thinkpad kernel: Modules linked in: cdc_acm ccm aufs overlay vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) binfmt_misc nls_iso8859_1 uvcvideo videobuf2_vmalloc v
Nov 04 16:26:06 thinkpad kernel: ppdev lp parport ip_tables x_tables autofs4 hid_generic usbhid hid rtsx_pci_sdmmc rtsx_pci psmouse ahci e1000e libahci wmi video
Nov 04 16:26:06 thinkpad kernel: CPU: 0 PID: 0 Comm: swapper/0 Tainted: G OE 5.4.0-52-generic #57~18.04.1-Ubuntu
Nov 04 16:26:06 thinkpad kernel: Hardware name: LENOVO 20BXCT01WW/20BXCT01WW, BIOS JBET73WW (1.37 ) 08/14/2019
Nov 04 16:26:06 thinkpad kernel: RIP: 0010:__queue_work+0x35f/0x400
Nov 04 16:26:06 thinkpad kernel: Code: 25 c0 6b 01 00 f6 47 24 20 74 18 e8 9b 92 00 00 48 85 c0 74 0e 48 8b 40 20 48 3b 58 08 0f 84 d7 fc ff ff 0f 0b e9 f7 fd ff ff <0f> 0b
Nov 04 16:26:06 thinkpad kernel: RSP: 0018:ffffb4c3c0003c40 EFLAGS: 00010002
Nov 04 16:26:06 thinkpad kernel: RAX: ffff9be6273dd790 RBX: ffff9be6a480ce00 RCX: 0000000000000000
Nov 04 16:26:06 thinkpad kernel: RDX: ffff9be6273dd798 RSI: 0000000000000000 RDI: ffff9be6a5a2a680
Nov 04 16:26:06 thinkpad kernel: RBP: ffffb4c3c0003c78 R08: ffff9be6a4400920 R09: ffff9be6a4400948
Nov 04 16:26:06 thinkpad kernel: R10: 0000000000000000 R11: ffffffffa425d958 R12: 0000000000000000
Nov 04 16:26:06 thinkpad kernel: R13: 0000000000002000 R14: ffff9be6273dd790 R15: ffff9be6a5a2f700
Nov 04 16:26:06 thinkpad kernel: FS: 0000000000000000(0000) GS:ffff9be6a5a00000(0000) knlGS:0000000000000000
Nov 04 16:26:06 thinkpad kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Nov 04 16:26:06 thinkpad kernel: CR2: 00007f6727af3000 CR3: 00000001e4c0a006 CR4: 00000000003606f0
Nov 04 16:26:06 thinkpad kernel: DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Nov 04 16:26:06 thinkpad kernel: DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Nov 04 16:26:06 thinkpad kernel: Call Trace:
Nov 04 16:26:06 thinkpad kernel: <IRQ>
Nov 04 16:26:06 thinkpad kernel: queue_work_on+0x39/0x40
Nov 04 16:26:06 thinkpad kernel: acm_write_bulk+0x70/0x80 [cdc_acm]
Nov 04 16:26:06 thinkpad kernel: __usb_hcd_giveback_urb+0x93/0x120
Nov 04 16:26:06 thinkpad kernel: usb_hcd_giveback_urb+0xb8/0xe0
Nov 04 16:26:06 thinkpad kernel: xhci_giveback_urb_in_irq.isra.46+0x84/0xf0
Nov 04 16:26:06 thinkpad kernel: xhci_td_cleanup+0xe2/0x180
Xubuntu 18.04 5.4.0-52-通用