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Eric Dumazet cb7cf8a33f inet: Clean up inet_csk_wait_for_connect() vs. might_sleep() 
I got the following trace with current net-next kernel :

[14723.885290] WARNING: CPU: 26 PID: 22658 at kernel/sched/core.c:7285 __might_sleep+0x89/0xa0()
[14723.885325] do not call blocking ops when !TASK_RUNNING; state=1 set at [<ffffffff810e8734>] prepare_to_wait_exclusive+0x34/0xa0
[14723.885355] CPU: 26 PID: 22658 Comm: netserver Not tainted 4.0.0-dbg-DEV #1379
[14723.885359]  ffffffff81a223a8 ffff881fae9e7ca8 ffffffff81650b5d 0000000000000001
[14723.885364]  ffff881fae9e7cf8 ffff881fae9e7ce8 ffffffff810a72e7 0000000000000000
[14723.885367]  ffffffff81a57620 000000000000093a 0000000000000000 ffff881fae9e7e64
[14723.885371] Call Trace:
[14723.885377]  [<ffffffff81650b5d>] dump_stack+0x4c/0x65
[14723.885382]  [<ffffffff810a72e7>] warn_slowpath_common+0x97/0xe0
[14723.885386]  [<ffffffff810a73e6>] warn_slowpath_fmt+0x46/0x50
[14723.885390]  [<ffffffff810f4c5d>] ? trace_hardirqs_on_caller+0x10d/0x1d0
[14723.885393]  [<ffffffff810e8734>] ? prepare_to_wait_exclusive+0x34/0xa0
[14723.885396]  [<ffffffff810e8734>] ? prepare_to_wait_exclusive+0x34/0xa0
[14723.885399]  [<ffffffff810ccdc9>] __might_sleep+0x89/0xa0
[14723.885403]  [<ffffffff81581846>] lock_sock_nested+0x36/0xb0
[14723.885406]  [<ffffffff815829a3>] ? release_sock+0x173/0x1c0
[14723.885411]  [<ffffffff815ea1f7>] inet_csk_accept+0x157/0x2a0
[14723.885415]  [<ffffffff810e8900>] ? abort_exclusive_wait+0xc0/0xc0
[14723.885419]  [<ffffffff8161b96d>] inet_accept+0x2d/0x150
[14723.885424]  [<ffffffff8157db6f>] SYSC_accept4+0xff/0x210
[14723.885428]  [<ffffffff8165a451>] ? retint_swapgs+0xe/0x44
[14723.885431]  [<ffffffff810f4c5d>] ? trace_hardirqs_on_caller+0x10d/0x1d0
[14723.885437]  [<ffffffff81369c0e>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[14723.885441]  [<ffffffff8157ef40>] SyS_accept+0x10/0x20
[14723.885444]  [<ffffffff81659872>] system_call_fastpath+0x12/0x17
[14723.885447] ---[ end trace ff74cd83355b1873 ]---

In commit 26cabd3125
Peter added a sched_annotate_sleep() in sk_wait_event()

Is the following patch needed as well ?

Alternative would be to use sk_wait_event() from inet_csk_wait_for_connect()

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-03-17 15:03:54 -04:00
..
netfilter netfilter: nf_tables: fix port natting in little endian archs 2014-12-23 15:34:28 +01:00
af_inet.c net: rfs: add hash collision detection 2015-02-08 16:53:57 -08:00
ah4.c ipsec: Remove obsolete MAX_AH_AUTH_LEN 2014-09-18 10:54:36 +02:00
arp.c neigh: remove dynamic neigh table registration support 2014-11-11 15:23:54 -05:00
cipso_ipv4.c cipso: don't use IPCB() to locate the CIPSO IP option 2015-02-11 14:46:37 -05:00
datagram.c net: Save TX flow hash in sock and set in skbuf on xmit 2014-07-07 21:14:21 -07:00
devinet.c net: spelling fixes 2015-02-14 20:36:08 -08:00
esp4.c net: esp: Convert NETDEBUG to pr_info 2014-11-06 15:11:10 -05:00
fib_frontend.c fib_trie: Push rcu_read_lock/unlock to callers 2014-12-31 18:25:54 -05:00
fib_lookup.h fib_trie: Move fib_find_alias to file where it is used 2015-01-25 14:47:16 -08:00
fib_rules.c fib_trie: Push rcu_read_lock/unlock to callers 2014-12-31 18:25:54 -05:00
fib_semantics.c fib_trie: Move fib_find_alias to file where it is used 2015-01-25 14:47:16 -08:00
fib_trie.c fib_trie: Various clean-ups for handling slen 2015-01-25 14:47:16 -08:00
fou.c gue: Use checksum partial with remote checksum offload 2015-02-11 15:12:13 -08:00
geneve.c openvswitch: Add support for checksums on UDP tunnels. 2015-01-28 23:04:15 -08:00
gre_demux.c net: Fix GRE RX to use skb_transport_header for GRE header offset 2014-09-08 15:23:05 -07:00
gre_offload.c gre: Set inner mac header in gro complete 2014-12-05 21:18:34 -08:00
icmp.c ipv4: icmp: use percpu allocation 2015-01-31 17:48:18 -08:00
igmp.c ipv6: mld: fix add_grhead skb_over_panic for devs with large MTUs 2014-11-16 16:55:06 -05:00
inet_connection_sock.c inet: Clean up inet_csk_wait_for_connect() vs. might_sleep() 2015-03-17 15:03:54 -04:00
inet_diag.c inet_diag: fix possible overflow in inet_diag_dump_one_icsk() 2015-03-13 15:54:27 -04:00
inet_fragment.c net: Convert LIMIT_NETDEBUG to net_dbg_ratelimited 2014-11-11 14:10:31 -05:00
inet_hashtables.c net: use reciprocal_scale() helper 2014-08-23 12:21:21 -07:00
inet_lro.c
inet_timewait_sock.c
inetpeer.c inet: remove dead inetpeer sequence code 2014-09-08 16:42:42 -07:00
ip_forward.c xps: must clear sender_cpu before forwarding 2015-03-11 23:51:18 -04:00
ip_fragment.c ipv4: ip_check_defrag should not assume that skb_network_offset is zero 2015-03-05 21:43:48 -05:00
ip_gre.c gre/ipip: use be16 variants of netlink functions 2015-02-08 16:28:06 -08:00
ip_input.c
ip_options.c ipv4: rename ip_options_echo to __ip_options_echo() 2014-09-28 16:35:42 -04:00
ip_output.c udp: only allow UFO for packets from SOCK_DGRAM sockets 2015-03-02 22:19:29 -05:00
ip_sockglue.c ip: fix error queue empty skb handling 2015-03-08 23:01:54 -04:00
ip_tunnel.c tunnels: advertise link netns via netlink 2015-01-19 14:32:03 -05:00
ip_tunnel_core.c ipv4: fix a potential use after free in ip_tunnel_core.c 2014-10-17 23:45:26 -04:00
ip_vti.c tunnels: advertise link netns via netlink 2015-01-19 14:32:03 -05:00
ipcomp.c
ipconfig.c net: ipv4: handle DSA enabled master network devices 2015-01-19 15:45:10 -05:00
ipip.c gre/ipip: use be16 variants of netlink functions 2015-02-08 16:28:06 -08:00
ipmr.c netlink: make nlmsg_end() and genlmsg_end() void 2015-01-18 01:03:45 -05:00
Kconfig net: Move fou_build_header into fou.c and refactor 2014-11-05 16:30:02 -05:00
Makefile net: Add Geneve tunneling protocol driver 2014-10-06 00:32:20 -04:00
netfilter.c
ping.c net: ping: Return EAFNOSUPPORT when appropriate. 2015-03-04 15:46:51 -05:00
proc.c tcp: helpers to mitigate ACK loops by rate-limiting out-of-window dupacks 2015-02-08 01:03:12 -08:00
protocol.c net: Export inet_offloads and inet6_offloads 2014-09-19 17:15:31 -04:00
raw.c net: switch memcpy_fromiovec()/memcpy_fromiovecend() users to copy_from_iter() 2015-02-04 01:34:15 -05:00
route.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-02-05 14:33:28 -08:00
syncookies.c net: allow setting ecn via routing table 2014-11-04 16:06:09 -05:00
sysctl_net_ipv4.c ipv4: Namespecify TCP PMTU mechanism 2015-02-09 18:45:00 -08:00
tcp.c tcp: align tcp_xmit_size_goal() on tcp_tso_autosize() 2015-03-05 22:31:12 -05:00
tcp_bic.c tcp: stretch ACK fixes prep 2015-01-28 22:18:37 -08:00
tcp_cong.c tcp: fix tcp_cong_avoid_ai() credit accumulation bug with decreases in w 2015-03-11 16:51:51 -04:00
tcp_cubic.c tcp: restore 1.5x per RTT limit to CUBIC cwnd growth in congestion avoidance 2015-03-11 16:51:51 -04:00
tcp_dctcp.c net: tcp: add DCTCP congestion control algorithm 2014-09-29 00:13:10 -04:00
tcp_diag.c tcp: whitespace fixes 2014-09-01 18:12:45 -07:00
tcp_fastopen.c tcp: make sure skb is not shared before using skb_get() 2015-02-13 07:11:40 -08:00
tcp_highspeed.c tcp: whitespace fixes 2014-09-01 18:12:45 -07:00
tcp_htcp.c tcp: whitespace fixes 2014-09-01 18:12:45 -07:00
tcp_hybla.c tcp: whitespace fixes 2014-09-01 18:12:45 -07:00
tcp_illinois.c tcp: whitespace fixes 2014-09-01 18:12:45 -07:00
tcp_input.c tcp: fix tcp_should_expand_sndbuf() to use tcp_packets_in_flight() 2015-02-22 23:07:11 -05:00
tcp_ipv4.c ipv4: Namespecify TCP PMTU mechanism 2015-02-09 18:45:00 -08:00
tcp_lp.c
tcp_memcontrol.c memcg: cleanup static keys decrement 2015-02-12 18:54:10 -08:00
tcp_metrics.c netlink: make nlmsg_end() and genlmsg_end() void 2015-01-18 01:03:45 -05:00
tcp_minisocks.c tcp: mitigate ACK loops for connections as tcp_timewait_sock 2015-02-08 01:03:13 -08:00
tcp_offload.c net: Remove MPLS GSO feature. 2014-11-05 23:52:33 -08:00
tcp_output.c ipv4: Namespecify TCP PMTU mechanism 2015-02-09 18:45:00 -08:00
tcp_probe.c tcp: whitespace fixes 2014-09-01 18:12:45 -07:00
tcp_scalable.c tcp: stretch ACK fixes prep 2015-01-28 22:18:37 -08:00
tcp_timer.c ipv4: Namespecify TCP PMTU mechanism 2015-02-09 18:45:00 -08:00
tcp_vegas.c tcp: whitespace fixes 2014-09-01 18:12:45 -07:00
tcp_vegas.h
tcp_veno.c tcp: stretch ACK fixes prep 2015-01-28 22:18:37 -08:00
tcp_westwood.c net: tcp: split ack slow/fast events from cwnd_event 2014-09-29 00:13:10 -04:00
tcp_yeah.c tcp: stretch ACK fixes prep 2015-01-28 22:18:37 -08:00
tunnel4.c
udp.c ip: Add offset parameter to ip_cmsg_recv 2015-01-05 22:44:46 -05:00
udp_diag.c udp_diag: Fix socket skipping within chain 2015-01-27 00:02:41 -08:00
udp_impl.h
udp_offload.c udp: Set SKB_GSO_UDP_TUNNEL* in UDP GRO path 2015-02-11 15:12:10 -08:00
udp_tunnel.c udp: Do not require sock in udp_tunnel_xmit_skb 2015-01-24 23:15:40 -08:00
udplite.c
xfrm4_input.c
xfrm4_mode_beet.c
xfrm4_mode_transport.c
xfrm4_mode_tunnel.c
xfrm4_output.c xfrm: Fix local error reporting crash with interfamily tunnels 2015-02-09 11:14:17 +01:00
xfrm4_policy.c
xfrm4_protocol.c
xfrm4_state.c
xfrm4_tunnel.c