is it possibility that sk->sk_dst_cache is overwritten? like in __sk_dst_check,
when tcp timer tries to resend a packet, at the same time, tcp_close is called,
and a reset packet will send, and ip_queue_xmit will be called concurrent；
cpu 1 cpu 2
tcp_close
tcp_send_active_reset
ip_queue_xmit
__sk_dst_check {
dst = __sk_dst_get(sk);
tcp timer fire
tcp_retransmit_timer
__tcp_retransmit_skb
ip_queue_xmit
sk_setup_caps
sk->sk_dst_cache is
changed, like dst222
RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
dst222 is leaked
dst_release(dst);
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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1711407
Title:
unregister_netdevice: waiting for lo to become free
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Trusty:
In Progress
Status in linux source package in Xenial:
In Progress
Status in linux source package in Zesty:
Won't Fix
Status in linux source package in Artful:
In Progress
Status in linux source package in Bionic:
In Progress
Bug description:
This is a "continuation" of bug 1403152, as that bug has been marked
"fix released" and recent reports of failure may (or may not) be a new
bug. Any further reports of the problem should please be reported
here instead of that bug.
--
[Impact]
When shutting down and starting containers the container network
namespace may experience a dst reference counting leak which results
in this message repeated in the logs:
unregister_netdevice: waiting for lo to become free. Usage count =
1
This can cause issues when trying to create net network namespace and
thus block a user from creating new containers.
[Test Case]
See comment 16, reproducer provided at https://github.com/fho/docker-
samba-loop
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