From eb4dea5853046727bfbb579f0c9a8cae7369f7c6 Mon Sep 17 00:00:00 2001 From: Herbert Xu Date: Mon, 29 Dec 2008 23:04:08 -0800 Subject: net: Fix percpu counters deadlock When we converted the protocol atomic counters such as the orphan count and the total socket count deadlocks were introduced due to the mismatch in BH status of the spots that used the percpu counter operations. Based on the diagnosis and patch by Peter Zijlstra, this patch fixes these issues by disabling BH where we may be in process context. Reported-by: Jeff Kirsher Tested-by: Ingo Molnar Signed-off-by: Herbert Xu Signed-off-by: David S. Miller --- net/dccp/proto.c | 3 ++- net/ipv4/inet_connection_sock.c | 4 ++-- net/ipv4/proc.c | 13 +++++++++---- net/ipv4/tcp.c | 3 ++- net/ipv4/tcp_ipv4.c | 3 +++ net/ipv6/tcp_ipv6.c | 3 +++ 6 files changed, 21 insertions(+), 8 deletions(-) (limited to 'net') diff --git a/net/dccp/proto.c b/net/dccp/proto.c index d5c2bac..1747cca 100644 --- a/net/dccp/proto.c +++ b/net/dccp/proto.c @@ -964,7 +964,6 @@ adjudge_to_death: state = sk->sk_state; sock_hold(sk); sock_orphan(sk); - percpu_counter_inc(sk->sk_prot->orphan_count); /* * It is the last release_sock in its life. It will remove backlog. @@ -978,6 +977,8 @@ adjudge_to_death: bh_lock_sock(sk); WARN_ON(sock_owned_by_user(sk)); + percpu_counter_inc(sk->sk_prot->orphan_count); + /* Have we already been destroyed by a softirq or backlog? */ if (state != DCCP_CLOSED && sk->sk_state == DCCP_CLOSED) goto out; diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c index c7cda1c..f26ab38 100644 --- a/net/ipv4/inet_connection_sock.c +++ b/net/ipv4/inet_connection_sock.c @@ -633,8 +633,6 @@ void inet_csk_listen_stop(struct sock *sk) acc_req = req->dl_next; - percpu_counter_inc(sk->sk_prot->orphan_count); - local_bh_disable(); bh_lock_sock(child); WARN_ON(sock_owned_by_user(child)); @@ -644,6 +642,8 @@ void inet_csk_listen_stop(struct sock *sk) sock_orphan(child); + percpu_counter_inc(sk->sk_prot->orphan_count); + inet_csk_destroy_sock(child); bh_unlock_sock(child); diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c index 614958b..eb62e58 100644 --- a/net/ipv4/proc.c +++ b/net/ipv4/proc.c @@ -38,6 +38,7 @@ #include #include #include +#include #include #include #include @@ -50,13 +51,17 @@ static int sockstat_seq_show(struct seq_file *seq, void *v) { struct net *net = seq->private; + int orphans, sockets; + + local_bh_disable(); + orphans = percpu_counter_sum_positive(&tcp_orphan_count), + sockets = percpu_counter_sum_positive(&tcp_sockets_allocated), + local_bh_enable(); socket_seq_show(seq); seq_printf(seq, "TCP: inuse %d orphan %d tw %d alloc %d mem %d\n", - sock_prot_inuse_get(net, &tcp_prot), - (int)percpu_counter_sum_positive(&tcp_orphan_count), - tcp_death_row.tw_count, - (int)percpu_counter_sum_positive(&tcp_sockets_allocated), + sock_prot_inuse_get(net, &tcp_prot), orphans, + tcp_death_row.tw_count, sockets, atomic_read(&tcp_memory_allocated)); seq_printf(seq, "UDP: inuse %d mem %d\n", sock_prot_inuse_get(net, &udp_prot), diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 1f3d529..f28acf1 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -1836,7 +1836,6 @@ adjudge_to_death: state = sk->sk_state; sock_hold(sk); sock_orphan(sk); - percpu_counter_inc(sk->sk_prot->orphan_count); /* It is the last release_sock in its life. It will remove backlog. */ release_sock(sk); @@ -1849,6 +1848,8 @@ adjudge_to_death: bh_lock_sock(sk); WARN_ON(sock_owned_by_user(sk)); + percpu_counter_inc(sk->sk_prot->orphan_count); + /* Have we already been destroyed by a softirq or backlog? */ if (state != TCP_CLOSE && sk->sk_state == TCP_CLOSE) goto out; diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index 1017248..9d839fa 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -51,6 +51,7 @@ */ +#include #include #include #include @@ -1797,7 +1798,9 @@ static int tcp_v4_init_sock(struct sock *sk) sk->sk_sndbuf = sysctl_tcp_wmem[1]; sk->sk_rcvbuf = sysctl_tcp_rmem[1]; + local_bh_disable(); percpu_counter_inc(&tcp_sockets_allocated); + local_bh_enable(); return 0; } diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index 8702b06..e8b8337 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -23,6 +23,7 @@ * 2 of the License, or (at your option) any later version. */ +#include #include #include #include @@ -1830,7 +1831,9 @@ static int tcp_v6_init_sock(struct sock *sk) sk->sk_sndbuf = sysctl_tcp_wmem[1]; sk->sk_rcvbuf = sysctl_tcp_rmem[1]; + local_bh_disable(); percpu_counter_inc(&tcp_sockets_allocated); + local_bh_enable(); return 0; } -- cgit v1.1