[TEST] net/bind_wildcard flakiness

[TEST] net/bind_wildcard flakiness

[Jakub Kicinski]

Hi!

The bind_wildcard used to be rock solid, no flakes in last 1000 runs,
but then around the time Eric posted his Rx optimizations we hit one
flake, and now we hit another:

List:
https://netdev.bots.linux.dev/contest.html?test=bind-wildcard&executor=vmksft-net&pass=0

Outputs:
https://netdev-3.bots.linux.dev/vmksft-net/results/122022/14-bind-wildcard/stdout
https://netdev-3.bots.linux.dev/vmksft-net/results/123463/14-bind-wildcard/stdout

One does:

# 0.21 [+0.00] # bind_wildcard.c:768:reuseaddr:Expected ret (-1) == 0 (0)
# 0.21 [+0.00] # reuseaddr: Test terminated by assertion
# 0.21 [+0.00] #          FAIL  bind_wildcard.v6_any_only_v6_v4mapped_any.reuseaddr

The other:

# 0.25 [+0.00] # bind_wildcard.c:775:plain:Expected ret (-1) == 0 (0)
# 0.25 [+0.00] # plain: Test terminated by assertion
# 0.25 [+0.00] #          FAIL  bind_wildcard.v6_local_v6_v4mapped_any.plain


The only change on the infra side is that I increased disk IO cap,
so the builds are now faster.

Re: [TEST] net/bind_wildcard flakiness

[Kuniyuki Iwashima]

From: Jakub Kicinski <kuba@kernel.org>
Date: Fri, 16 May 2025 10:05:42 -0700
> Hi!
> 
> The bind_wildcard used to be rock solid, no flakes in last 1000 runs,
> but then around the time Eric posted his Rx optimizations we hit one
> flake, and now we hit another:

Thanks for the report.

The test only calls bind() so I guess it's not related to the RX
optimisation series.


> 
> List:
> https://netdev.bots.linux.dev/contest.html?test=bind-wildcard&executor=vmksft-net&pass=0
> 
> Outputs:
> https://netdev-3.bots.linux.dev/vmksft-net/results/122022/14-bind-wildcard/stdout
> https://netdev-3.bots.linux.dev/vmksft-net/results/123463/14-bind-wildcard/stdout
> 
> One does:
> 
> # 0.21 [+0.00] # bind_wildcard.c:768:reuseaddr:Expected ret (-1) == 0 (0)
> # 0.21 [+0.00] # reuseaddr: Test terminated by assertion
> # 0.21 [+0.00] #          FAIL  bind_wildcard.v6_any_only_v6_v4mapped_any.reuseaddr
> 
> The other:
> 
> # 0.25 [+0.00] # bind_wildcard.c:775:plain:Expected ret (-1) == 0 (0)
> # 0.25 [+0.00] # plain: Test terminated by assertion
> # 0.25 [+0.00] #          FAIL  bind_wildcard.v6_local_v6_v4mapped_any.plain

This is weird because both cases failed when bind() should succeed.

Will try to reproduce on my end.


> 
> 
> The only change on the infra side is that I increased disk IO cap,
> so the builds are now faster.