Easy steps to reproduce this issue:
sudo modprobe l2tp_core
sudo ./linux-5.4.0/tools/testing/selftests/net/l2tp.sh
./close
where close is compiled from:
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <stdio.h>
int main()
{
int fd;
printf("calling socket..\n");
fd = socket(AF_APPLETALK, SOCK_STREAM, 0);
printf("socket returned: %d\n", fd);
}
When running the above program we just see "calling socket" and it
blocks forever on the socket call. After a couple of minutes we get the
kernel hung task warning. We also see repeated messages:
unregister_netdevice: waiting for eth0 to become free. Usage count = 1
I'll bisect the kernel next.
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https://bugs.launchpad.net/bugs/1854968
Title:
stress-ng sctp stressor breaks 5.4.0.7-8 on s390x
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