Dan Williams <[email protected]> writes:
> On Thu, 2015-10-22 at 10:39 +0200, Erwin Van de Velde wrote:
>> Hi all,
>>
>> Thank you for your helpful answers! I have investigated it further,
>> stopping potential culprits in userspace and I have found the issue:
>> it is modemmanager that seems to keep the devices open somewhere and
>> thus causes the ttyUSB numbers to go up. So now I will redirect the
>> issue to their developers :-)
>
> There was a bug between ModemManager 1.2 and 1.4.2 that could have
> triggered this, which was fixed in commit
> 009af02f6d06d5020e397455354b9ccc56557b02. So make sure you have 1.4.2
> (released on 13-Jan-2015) or later.
Yes, unfortunately that includes the current Debian stable version:
nemi:/home/bjorn# apt-cache policy modemmanager
modemmanager:
Installed: 1.4.0-1
Candidate: 1.4.0-1
Version table:
1.4.12-1 0
600 http://ftp.no.debian.org/debian/ sid/main amd64 Packages
*** 1.4.0-1 0
700 http://ftp.no.debian.org/debian/ jessie/main amd64 Packages
100 /var/lib/dpkg/status
nemi:/home/bjorn# lsof -p8191|grep /dev
ModemMana 8191 root 0u CHR 136,14 0t0 17
/dev/pts/14
ModemMana 8191 root 1u CHR 136,14 0t0 17
/dev/pts/14
ModemMana 8191 root 2u CHR 136,14 0t0 17
/dev/pts/14
ModemMana 8191 root 9u CHR 180,0 0t0 1091872
/dev/cdc-wdm0
ModemMana 8191 root 10u CHR 166,0 0t0 9804
/dev/ttyACM0 (deleted)
ModemMana 8191 root 11u CHR 166,1 0t0 397155
/dev/ttyACM1 (deleted)
ModemMana 8191 root 12u CHR 166,2 0t0 448536
/dev/ttyACM2 (deleted)
ModemMana 8191 root 13u CHR 166,3 0t0 507569
/dev/ttyACM3 (deleted)
ModemMana 8191 root 14u CHR 166,4 0t0 673258
/dev/ttyACM4 (deleted)
ModemMana 8191 root 15u CHR 166,5 0t0 922024
/dev/ttyACM5 (deleted)
I must admit that I have known about this, but have been too lazy to
report it against the Debian package. It doesn't cause any real
problems for me, even if I sometimes do large numbers of modem
plug/unplug cycles. I just restart ModemManager if I find the device
numbers too high :)
Bjørn
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