On Fri, 11 Jul 2025 02:14:03 +0000 Hangbin Liu wrote:
> > sleep 5
> > + # Schedule out for a bit, address GC runs from the power efficient WQ
> > + # if the long sleep above has put the whole system into sleep state
> > + # the WQ may have not had a chance to run.
> > + sleep 0.1
> > +
>
> How about use slowwait to check if the address still exists.
Weirdly if we read the addresses twice they disappear, I haven't looked
into the code for the why, but seemed like using slowwait could
potentially mask the addresses sticking around when nobody runs
the Netlink handlers for a while? Dunno..
I queued this debug patch a couple of months ago:
sleep 5
- run_cmd_grep_fail "10.23.11." ip addr show dev "$devdummy"
+ ip addr show dev "$devdummy" > /tmp/a
+ run_cmd_grep_fail "10.23.11." cat /tmp/a
if [ $? -eq 0 ]; then
- check_err 1
- end_test "FAIL: preferred_lft addresses remaining"
+ check_err 1
+ cat /tmp/a
+ echo "==="
+ ip addr show dev "$devdummy"
+ end_test "FAIL: preferred_lft addresses remaining ($lft)"
return
fi
And when it flakes the output looks like this:
# 7.23 [+7.00] 297: test-dummy0: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc
noqueue state UNKNOWN group default qlen 1000
# 7.23 [+0.00] link/ether 9e:a6:c4:c2:1b:16 brd ff:ff:ff:ff:ff:ff
# 7.23 [+0.00] inet 10.23.11.81/32 scope global deprecated dynamic
test-dummy0
# 7.23 [+0.00] valid_lft 0sec preferred_lft 0sec
# 7.23 [+0.00] inet 10.23.11.84/32 scope global deprecated dynamic
test-dummy0
# 7.24 [+0.00] valid_lft 0sec preferred_lft 0sec
# 7.24 [+0.00] inet 10.23.11.93/32 scope global deprecated dynamic
test-dummy0
# 7.24 [+0.00] valid_lft 0sec preferred_lft 0sec
# 7.24 [+0.00] inet 10.23.11.94/32 scope global deprecated dynamic
test-dummy0
# 7.24 [+0.00] valid_lft 0sec preferred_lft 0sec
# 7.24 [+0.00] inet 10.23.11.97/32 scope global deprecated dynamic
test-dummy0
# 7.24 [+0.00] valid_lft 0sec preferred_lft 0sec
# 7.24 [+0.00] inet 10.23.11.99/32 scope global deprecated dynamic
test-dummy0
# 7.24 [+0.00] valid_lft 0sec preferred_lft 0sec
# 7.24 [+0.00] inet6 fe80::9ca6:c4ff:fec2:1b16/64 scope link proto
kernel_ll
# 7.24 [+0.00] valid_lft forever preferred_lft forever
# 7.24 [+0.00] ===
# 7.25 [+0.00] 297: test-dummy0: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc
noqueue state UNKNOWN group default qlen 1000
# 7.25 [+0.00] link/ether 9e:a6:c4:c2:1b:16 brd ff:ff:ff:ff:ff:ff
# 7.25 [+0.00] inet6 fe80::9ca6:c4ff:fec2:1b16/64 scope link proto
kernel_ll
# 7.25 [+0.00] valid_lft forever preferred_lft forever
# 7.25 [+0.00] FAIL: preferred_lft addresses remaining (1)
