[Pkg-electronics-devel] Bug#990863: Bug#990863: Bug#990863: libserialport0: libserialport tries to use termiox on bullseye, and fails to open serial ports

[Jonathan McDowell]

Control: tags -1 pending

On Fri, Jul 09, 2021 at 06:06:52PM +0100, Jonathan McDowell wrote:
> On Fri, Jul 09, 2021 at 05:55:52PM +0100, Tim Small wrote:
> > Package: libserialport0
> > Version: 0.1.1-3+b1
> > Severity: important
> > Tags: upstream patch
> > X-Debbugs-Cc: tim at seoss.co.uk
> > 
> > Serial port open seems to fail on bullseye.  Strace output follows:
> > 
> > 1512868 openat(AT_FDCWD, "/dev/ttyACM0", O_RDWR|O_NOCTTY|O_NONBLOCK) = 9
> > 1512868 ioctl(9, TCGETS, {B9600 opost isig icanon echo ...}) = 0
> > 1512868 ioctl(9, TIOCMGET, [TIOCM_DTR|TIOCM_RTS|TIOCM_CTS]) = 0
> > 1512868 ioctl(9, TCGETX, 0x55cd7cc80df0) = -1 ENOTTY (Inappropriate ioctl for device)
> > 1512868 close(9)                        = 0
> > 1512868 write(2, "sr: ", 4)             = 4
> > 1512868 write(2, "serial-libsp: Error opening port"..., 71) = 71
> > 1512868 write(2, "No devices found.\n", 18) = 18
> > 
> > Applying upstream commit 6f9b03e597ea fixes the issue.  I tested this
> > with:
> > 
> > /usr/local/bin/sigrok-cli --driver=rdtech-tc:conn=/dev/ttyACM0 --continuous
> > 
> > Patch here:
> > 
> > https://github.com/sigrokproject/libserialport/commit/6f9b03e597ea7200eb616a4e410add3dd1690cb1
> > 
> > I suspect that libserialport0 will fail to open all serial ports on
> > bullseye without this fix, so this bug may unfortunately be RC?
> 
> It looks like the kernel broke this in the v5.10.37 update
> (eef2158b0c44baa8cd9855091b1d99a35e16afdb), which hit
> unstable towards the end of May. Not clear why this was backported to
> the stable tree but I guess fixing libserialport is going to be the
> easier solution.

Fixed in
https://salsa.debian.org/electronics-team/sigrok/libserialport/-/tree/Bug990863
and unblock request sent to the release team; given we're so close to
release I'll understand entirely if this has to wait until the first
point release.

J.

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