Seen on linux-image-4.15.0-44-generic and linux-image-4.15.0-45-generic.
When /bin/login is exec'd by agetty it tries to read stdin and gets
EAGAIN:
5640 write(2, "Password: ", 10) = 10
5640 read(0, 0x7ffcca86a7f0, 511) = -1 EAGAIN (Resource temporarily
unavailable)
...
55640 write(2, "\n", 1) = 1
taking that as a failed login attempt it tries again:
55640 write(2, "hilbert login: ", 15) = 15
55640 read(0, 0x7ffcca86a160, 511) = -1 EAGAIN (Resource temporarily
unavailable)
eventually logging a failed login attempt
reverting to linux-image-4.15.0-43-generic also fixes the problem
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https://bugs.launchpad.net/bugs/1814261
Title:
gpm prevents loging to the console: spurious “Enter” events seems
inserted
Status in gpm package in Ubuntu:
Confirmed
Bug description:
Hello,
When our servers boot, We can't login because of spurious “enter”.
We have this problem on virtual and physical machines since:
* kernel linux-image-4.15.0-44-generic on bionic
* kernel linux-image-4.4.0-142-generic on xenial
To reproduce:
1. start an ubuntu server with the specific kernel
2. install GPM
3. on a console
1. type the user name “root”
2. hit “enter”
3. wait few seconds => spurious “Enter” are send to the console
4. Stop gpm.service
5. retry to login on a console => no problem
lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 18.04.1 LTS
Release: 18.04
Codename: bionic
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gpm/+bug/1814261/+subscriptions
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