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I've tried updating the kernel version to = 6.12.3=0A= and the same error message still exists during shutdown.=0A= =0A= I understand this is not a bug or a functional issue and the kernel is corr= ectly noting that the hardware is no longer reachable.=0A= =0A= However, I would like to know if canceling the USB messages when the hardwa= re has gone away so that the error message doesn't happen is something that= is considered for future kernel versions.=0A= =0A= Thank you,=0A= Jun Ko=0A= =0A= =0A= ________________________________________=0A= From: Greg KH =0A= Sent: Thursday, September 18, 2025 5:09 PM=0A= To: Ko, Kang Jun =0A= Cc: linux-usb@vger.kernel.org =0A= Subject: Re: USB: urb error log during reboot on devices with multiple seri= al consoles (Linux Kernel version 5.15.71)=0A= =0A= =0A= On Thu, Sep 18, 2025 at 08:39:11AM +0000, Ko, Kang Jun wrote:=0A= > Hello,=0A= > =0A= > I am reporting an USB related issue on the Linux Kernel version 5.15.71= =0A= =0A= Please note that that kernel is _VERY_ old and out of date and not=0A= supported by anyone as it was released over 3 years ago.=A0 There have=0A= been over 19000 changes made to the 5.15.y branch since then.=0A= =0A= Please try updating and see if the issue persists with the latest 5.15.y=0A= release.=0A= =0A= But, as you write:=0A= =0A= > Below is an error message that is seen in my dmesg log when my network sw= itch goes into reboot. =0A= > =0A= > /****** Reboot log ******/=0A= > ...=0A= > Reboot reason: Reboot requested by user=0A= > reboot: Restarting system=0A= > ftdi_sio ttyUSB0: usb_serial_generic_write_start - error submitting urb: = -19=0A= > ...=0A= > /****** Reboot log ******/=0A= > =0A= > Summary:=0A= > Our network switch has two serial consoles attached to the system (one co= nnected to the processor, one connected to FTDI chip).=0A= > When the switch goes into reboot, I can see (from the console connected t= o the processor) the above error message.=0A= > There is no functional problem in rebooting the switch but I would like t= o know if the error message is something intended by the Linux Kernel.=0A= > =0A= > Reproduction steps:=0A= > Attach two serial consoles to the system and reboot.=0A= > =0A= > Additional notes:=0A= > The serial drivers do not have a designated "shutdown" method so the driv= er is still present when the kernel goes through the device_shutdown method= within the kernel_restart_prepare() function. The ftdi_sio serial driver c= ontinues to submit URB messages to the console when the console is already = removed from the system, which results in the error message.=0A= > =0A= > Conclusion:=0A= > Although this is not a functional issue and is not observed on systems wi= th one serial console attached, this error message can be seen 100% on rebo= ot on devices with multiple consoles. I would like to know if this error lo= g is intended by design or if it is something that was not considered becau= se there is no functional issue.=0A= =0A= This really isn't a bug, and you should be able to just ignore it, the=0A= kernel is correctly noting that it could not submit the USB message=0A= because the hardware has gone away and you did not close the console=0A= before that happened.=0A= =0A= But again, PLEASE update your kernel, it is very old and full of known=0A= security issues that have been resolved already.=0A= =0A= thanks,=0A= =0A= greg k-h=0A= =0A= =0A=