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Message-ID: <1427130389.25985.76.camel@edumazet-glaptop2.roam.corp.google.com>
Date: Mon, 23 Mar 2015 10:06:29 -0700
From: Eric Dumazet <eric.dumazet@...il.com>
To: Fan Du <fengyuleidian0615@...il.com>,
David Miller <davem@...emloft.net>
Cc: Erik Hugne <erik.hugne@...csson.com>, netdev@...r.kernel.org
Subject: [PATCH net-next] inet: fix double request socket freeing
From: Fan Du <fan.du@...el.com>
Eric Hugne reported following error :
I'm hitting this warning on latest net-next when i try to SSH into a machine
with eth0 added to a bridge (but i think the problem is older than that)
Steps to reproduce:
node2 ~ # brctl addif br0 eth0
[ 223.758785] device eth0 entered promiscuous mode
node2 ~ # ip link set br0 up
[ 244.503614] br0: port 1(eth0) entered forwarding state
[ 244.505108] br0: port 1(eth0) entered forwarding state
node2 ~ # [ 251.160159] ------------[ cut here ]------------
[ 251.160831] WARNING: CPU: 0 PID: 3 at include/net/request_sock.h:102 tcp_v4_err+0x6b1/0x720()
[ 251.162077] Modules linked in:
[ 251.162496] CPU: 0 PID: 3 Comm: ksoftirqd/0 Not tainted 4.0.0-rc3+ #18
[ 251.163334] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 251.164078] ffffffff81a8365c ffff880038a6ba18 ffffffff8162ace4 0000000000009898
[ 251.165084] 0000000000000000 ffff880038a6ba58 ffffffff8104da85 ffff88003fa437c0
[ 251.166195] ffff88003fa437c0 ffff88003fa74e00 ffff88003fa43bb8 ffff88003fad99a0
[ 251.167203] Call Trace:
[ 251.167533] [<ffffffff8162ace4>] dump_stack+0x45/0x57
[ 251.168206] [<ffffffff8104da85>] warn_slowpath_common+0x85/0xc0
[ 251.169239] [<ffffffff8104db65>] warn_slowpath_null+0x15/0x20
[ 251.170271] [<ffffffff81559d51>] tcp_v4_err+0x6b1/0x720
[ 251.171408] [<ffffffff81630d03>] ? _raw_read_lock_irq+0x3/0x10
[ 251.172589] [<ffffffff81534e20>] ? inet_del_offload+0x40/0x40
[ 251.173366] [<ffffffff81569295>] icmp_socket_deliver+0x65/0xb0
[ 251.174134] [<ffffffff815693a2>] icmp_unreach+0xc2/0x280
[ 251.174820] [<ffffffff8156a82d>] icmp_rcv+0x2bd/0x3a0
[ 251.175473] [<ffffffff81534ea2>] ip_local_deliver_finish+0x82/0x1e0
[ 251.176282] [<ffffffff815354d8>] ip_local_deliver+0x88/0x90
[ 251.177004] [<ffffffff815350f0>] ip_rcv_finish+0xf0/0x310
[ 251.177693] [<ffffffff815357bc>] ip_rcv+0x2dc/0x390
[ 251.178336] [<ffffffff814f5da3>] __netif_receive_skb_core+0x713/0xa20
[ 251.179170] [<ffffffff814f7fca>] __netif_receive_skb+0x1a/0x80
[ 251.179922] [<ffffffff814f97d4>] process_backlog+0x94/0x120
[ 251.180639] [<ffffffff814f9612>] net_rx_action+0x1e2/0x310
[ 251.181356] [<ffffffff81051267>] __do_softirq+0xa7/0x290
[ 251.182046] [<ffffffff81051469>] run_ksoftirqd+0x19/0x30
[ 251.182726] [<ffffffff8106cc23>] smpboot_thread_fn+0x153/0x1d0
[ 251.183485] [<ffffffff8106cad0>] ? SyS_setgroups+0x130/0x130
[ 251.184228] [<ffffffff8106935e>] kthread+0xee/0x110
[ 251.184871] [<ffffffff81069270>] ? kthread_create_on_node+0x1b0/0x1b0
[ 251.185690] [<ffffffff81631108>] ret_from_fork+0x58/0x90
[ 251.186385] [<ffffffff81069270>] ? kthread_create_on_node+0x1b0/0x1b0
[ 251.187216] ---[ end trace c947fc7b24e42ea1 ]---
[ 259.542268] br0: port 1(eth0) entered forwarding state
Remove the double calls to reqsk_put()
[edumazet] :
I got confused because reqsk_timer_handler() _has_ to call
reqsk_put(req) after calling inet_csk_reqsk_queue_drop(), as
the timer handler holds a reference on req.
Signed-off-by: Fan Du <fan.du@...el.com>
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Reported-by: Erik Hugne <erik.hugne@...csson.com>
Fixes: fa76ce7328b2 ("inet: get rid of central tcp/dccp listener timer")
---
net/dccp/ipv4.c | 1 -
net/dccp/ipv6.c | 1 -
net/ipv4/tcp_ipv4.c | 1 -
net/ipv6/tcp_ipv6.c | 1 -
4 files changed, 4 deletions(-)
diff --git a/net/dccp/ipv4.c b/net/dccp/ipv4.c
index 25a9615b3b88993208a1e73f312103646c2d557f..fd805c08a8dcaeed01ffb0f951a8205141d0788c 100644
--- a/net/dccp/ipv4.c
+++ b/net/dccp/ipv4.c
@@ -316,7 +316,6 @@ static void dccp_v4_err(struct sk_buff *skb, u32 info)
* errors returned from accept().
*/
inet_csk_reqsk_queue_drop(sk, req);
- reqsk_put(req);
goto out;
case DCCP_REQUESTING:
diff --git a/net/dccp/ipv6.c b/net/dccp/ipv6.c
index 69d8f13895bac406a275ecd6ece4334c8d1ebb95..5137ab387d292c3ec221489381fe59b80fc931ff 100644
--- a/net/dccp/ipv6.c
+++ b/net/dccp/ipv6.c
@@ -174,7 +174,6 @@ static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
}
inet_csk_reqsk_queue_drop(sk, req);
- reqsk_put(req);
goto out;
case DCCP_REQUESTING:
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 5554b8f33d41b43dc4ccf3b95322e362bbe3844a..b1eaf3d56d09f97fe118b08a7d04c96ed2f812b5 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -487,7 +487,6 @@ void tcp_v4_err(struct sk_buff *icmp_skb, u32 info)
*/
inet_csk_reqsk_queue_drop(sk, req);
NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
- reqsk_put(req);
goto out;
case TCP_SYN_SENT:
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 6e3f90db038cb001dad5c4dddef88d93ecdbf5f3..1d551faec4e0a346c390de13ba6b71bf7e930a73 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -427,7 +427,6 @@ static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
inet_csk_reqsk_queue_drop(sk, req);
NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
- reqsk_put(req);
goto out;
case TCP_SYN_SENT:
--
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