From: Taehee Yoo <ap420073@gmail.com>
To: Hangbin Liu <liuhangbin@gmail.com>
Cc: Eric Dumazet <edumazet@google.com>,
David Miller <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
David Ahern <dsahern@kernel.org>, netdev <netdev@vger.kernel.org>
Subject: Re: [PATCH net] net: mld: do not use system_wq in the mld
Date: Fri, 22 Jul 2022 13:50:14 +0900 [thread overview]
Message-ID: <ecd370bb-dfd3-08e4-b526-fb93226b2dbb@gmail.com> (raw)
In-Reply-To: <YtomWhU9lR3ftEM+@Laptop-X1>
Hi Hangbin,
Thank you so much for the test and review!
On 7/22/22 13:23, Hangbin Liu wrote:
> On Fri, Jul 22, 2022 at 10:35:52AM +0800, Hangbin Liu wrote:
>>> I found this bug while testing another syzbot report.
>>>
(https://syzkaller.appspot.com/bug?id=ed41eaa4367b421d37aab5dee25e3f4c91ceae93)
>>> And I can't find the same case in the syzbot reports list.
>>>
>>> I just use some command lines and many kernel debug options such as
>>> kmemleak, kasan, lockdep, and others.
>>>
>>
>> Hi Taehee,
>>
>> I got a similar issue with yours after Eric's 2d3916f31891
>> ("ipv6: fix skb drops in igmp6_event_query() and igmp6_event_report()").
>> I use force_mld_version=1 and adding a lot of IPv6 address to
generate the
>> mld reports flood. Here is my reproducer:
>
> BTW, thanks for your fix. With your patch the issue is fixed. Please
feel free
> to add
>
> Tested-by: Hangbin Liu <liuhangbin@gmail.com>
>
I also tested with your reproducer.
I checked that it reproduces same issue.
[ 69.862696][ T58] [TEST]mld_report_work 1629
[ 87.129371][ T10] unregister_netdevice: waiting for veth0 to become
free. Usage count = 2
[ 87.132106][ T10] leaked reference.
[ 87.133276][ T10] ipv6_add_dev+0x324/0xec0
[ 87.134724][ T10] addrconf_notify+0x481/0xd10
[ 87.136200][ T10] raw_notifier_call_chain+0xe3/0x120
[ 87.137829][ T10] call_netdevice_notifiers+0x106/0x160
[ 87.139454][ T10] register_netdevice+0x114c/0x16b0
[ 87.140380][ T10] veth_newlink+0x48b/0xa50 [veth]
[ 87.141268][ T10] rtnl_newlink+0x11a2/0x1a40
[ 87.142073][ T10] rtnetlink_rcv_msg+0x63f/0xc00
[ 87.142956][ T10] netlink_rcv_skb+0x1df/0x3e0
[ 87.143861][ T10] netlink_unicast+0x5de/0x850
[ 87.144725][ T10] netlink_sendmsg+0x6c9/0xa90
[ 87.145595][ T10] ____sys_sendmsg+0x76a/0x780
[ 87.146483][ T10] __sys_sendmsg+0x27c/0x340
[ 87.147340][ T10] do_syscall_64+0x43/0x90
[ 87.148158][ T10] entry_SYSCALL_64_after_hwframe+0x63/0xcd
printk message and calltrace are same.
So, I'm sure that this is the same issue.
Also, I tested with my patch and your script for 1 hour, and the
reference count leak disappeared.
If you are okay, I would like to attach your reproducer script to the
commit message.
> Cheers
> Hangbin
Thank you so much
Taehee Yoo
next prev parent reply other threads:[~2022-07-22 4:50 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-21 12:03 [PATCH net] net: mld: do not use system_wq in the mld Taehee Yoo
2022-07-21 14:04 ` Eric Dumazet
2022-07-21 17:53 ` Taehee Yoo
2022-07-21 18:34 ` Eric Dumazet
2022-07-21 19:01 ` Taehee Yoo
2022-07-22 2:35 ` Hangbin Liu
2022-07-22 4:23 ` Hangbin Liu
2022-07-22 4:50 ` Taehee Yoo [this message]
2022-07-22 6:16 ` Hangbin Liu
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