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   MSGID:  f73d9269   
   REPLY:  f8ee2883   
   PID: SoupGate-Win32 v1.05   
   bob prohaska  wrote:   
   > From time to time my Pi 4 running   
   >   
   > Linux raspberrypi 6.1.21-v8+ #1642 SMP PREEMPT   
   > Mon Apr  3 17:24:16 BST 2023 aarch64 GNU/Linux   
   >   
   > crashes when a USB device is plugged into it.   
   > The Pi4 boots from a usb3 mechanical disk.   
   >   
   > Usually the culprit   
   > is a storage device, but an FT232-based usb-serial adapter did it   
   > also. The first symptom is an unresponsive menu bar and report about   
   > I/O error on the command line. The palsy grows over a few minutes   
   > as the mouse stops tracking. By that time there's nothing to do   
   > but cycle power.   
      
   What does:   
      
   sudo dmesg   
      
   say immediately after you plug it in?  You can print the last 30 lines with:   
      
   sudo dmesg | tail -30   
      
   It seems like the USB serial adapter wedges the USB subsystem, which is   
   problematic given your root filesystem is also on USB storage.  The storage   
   stops responding, and over time programs get increasingly unhappy that their   
   storage is not functioning.   
      
   Another thing to try is to plug the serial adapter into a USB2 port, which   
   is a different controller on the Pi4 from the USB storage.  Maybe that won't   
   break the storage?   
      
   Theo   
      
   --- SoupGate-Win32 v1.05   
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