I have the same issue, and I dump the vmcore, and find dst cache, hope it has
some help.
this leaked dst is in dst_busy_list, except dst_busy_list, nowhere I can find
it in
==============================
First case:
crash> rtable 0xffff880036fbba00 -x
struct rtable {
dst = {
callback_head = {
next = 0xffff880036fbb300,
func = 0x0
},
child = 0x0,
dev = 0xffff8817f15c3000,
ops = 0xffffffff8191f2c0 <ipv4_dst_ops>,
_metrics = 0xffffffff815ef7d1,
expires = 0x0,
path = 0xffff880036fbba00,
from = 0x0,
xfrm = 0x0,
input = 0xffffffff8149f777 <dst_discard>,
{
output = 0xffffffff8149f762 <dst_discard_sk>,
__UNIQUE_ID_rh_kabi_hide29 = {
output = 0xffffffff8149f762 <dst_discard_sk>
},
{<No data fields>}
},
flags = 0x0,
pending_confirm = 0x0,
error = 0x0,
obsolete = 0x2,
header_len = 0x0,
trailer_len = 0x0,
tclassid = 0x0,
__pad_to_align_refcnt = {0xe, 0x8006000000000},
__refcnt = {
counter = 0x1
},
__use = 0x0,
lastuse = 0x1000860b0,
{
next = 0xffff882fdaaa9800,
rt_next = 0xffff882fdaaa9800,
rt6_next = 0xffff882fdaaa9800,
dn_next = 0xffff882fdaaa9800
},
rh_reserved1 = 0x2,
rh_reserved2 = 0x85987845,
rh_reserved3 = 0x0,
rh_reserved4 = 0x0
},
rt_genid = 0x11,
rt_flags = 0x80000000,
rt_type = 0x2,
rt_is_input = 0x1,
rt_uses_gateway = 0x0,
rt_iif = 0x0,
rt_gateway = 0x0,
rt_pmtu = 0x0,
rt_uncached = {
next = 0xffff880036fbbac0,
prev = 0xffff880036fbbac0
}
}
crash>
=========================
seconds case:
crash> rtable ffff8807ec0d9a00 -x
struct rtable {
dst = {
callback_head = {
next = 0xffff8807ec0db900,
func = 0xffffffff8119e250 <file_free_rcu>
},
child = 0x0,
dev = 0xffff8817ed384800,
ops = 0xffffffff81b18bc0 <ipv4_dst_ops>,
_metrics = 0xffffffff817ca681,
expires = 0x0,
path = 0xffff8807ec0d9a00,
from = 0x0,
xfrm = 0x0,
input = 0xffffffff8162b200 <dst_discard>,
{
output = 0xffffffff8162b1e0 <dst_discard_sk>,
__UNIQUE_ID_rh_kabi_hide29 = {
output = 0xffffffff8162b1e0 <dst_discard_sk>
},
{<No data fields>}
},
flags = 0x6,
pending_confirm = 0x0,
error = 0x0,
obsolete = 0x2,
header_len = 0x0,
trailer_len = 0x0,
tclassid = 0x0,
__pad_to_align_refcnt = {0xffff880f6df8fec0, 0x0},
__refcnt = {
counter = 0x1
},
__use = 0x0,
lastuse = 0x1fcce9056,
{
next = 0xffff880404f49400,
rt_next = 0xffff880404f49400,
rt6_next = 0xffff880404f49400,
dn_next = 0xffff880404f49400
},
rh_reserved1 = 0x0,
rh_reserved2 = 0x0,
rh_reserved3 = 0x0,
rh_reserved4 = 0x0
},
rt_genid = 0x16,
rt_flags = 0x80000000,
rt_type = 0x2,
rt_is_input = 0x0,
rt_uses_gateway = 0x0,
rt_iif = 0x0,
rt_gateway = 0x0,
rt_pmtu = 0x0,
rt_uncached = {
next = 0xffff8807ec0d9ac0,
prev = 0xffff8807ec0d9ac0
}
}
crash>
--
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
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1711407/+subscriptions
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