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Date: Thu, 26 Oct 2017 00:17:50 +0800
From: kernel test robot <xiaolong.ye@...el.com>
To: Eric Dumazet <edumazet@...gle.com>
Cc: "David S. Miller" <davem@...emloft.net>,
LKML <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org,
lkp@...org
Subject: [lkp-robot] [tcp/dccp] a6ca7abe53: WARNING:suspicious_RCU_usage
FYI, we noticed the following commit (built with gcc-6):
commit: a6ca7abe53633d08eea1c6756cb49c9b2d4c90bf ("tcp/dccp: fix lockdep splat in inet_csk_route_req()")
https://git.kernel.org/cgit/linux/kernel/git/davem/net.git master
in testcase: iperf
with following parameters:
runtime: 300s
cluster: cs-localhost
protocol: tcp
test-description: iperf is a tool for active measurements of the maximum achievable bandwidth on IP networks.
test-url: https://iperf.fr/
on test machine: qemu-system-x86_64 -enable-kvm -cpu kvm64,+ssse3 -m 1G
caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
+------------------------------------------------------------------------------+------------+------------+
| | 3a91d29f20 | a6ca7abe53 |
+------------------------------------------------------------------------------+------------+------------+
| boot_successes | 4 | 2 |
| boot_failures | 4 | 4 |
| BUG:kernel_reboot-without-warning_in_test_stage | 4 | |
| WARNING:suspicious_RCU_usage | 0 | 4 |
| net/ipv4/inet_connection_sock.c:#suspicious_rcu_dereference_protected()usage | 0 | 4 |
+------------------------------------------------------------------------------+------------+------------+
[ 476.033425] WARNING: suspicious RCU usage
[ 476.046189] 4.14.0-rc5-00265-ga6ca7ab #22 Not tainted
[ 476.058434] -----------------------------
[ 476.068549] net/ipv4/inet_connection_sock.c:547 suspicious rcu_dereference_protected() usage!
[ 476.091235]
[ 476.091235] other info that might help us debug this:
[ 476.091235]
[ 476.110380]
[ 476.110380] rcu_scheduler_active = 2, debug_locks = 1
[ 476.126003] 4 locks held by iperf3/4672:
[ 476.135343] #0: (sk_lock-AF_INET){+.+.}, at: [<ffffffffb1d54f01>] lock_sock+0xb/0xd
[ 476.153481] #1: (rcu_read_lock){....}, at: [<ffffffffb1d23c0b>] rcu_lock_acquire+0x0/0x20
[ 476.172571] #2: (rcu_read_lock){....}, at: [<ffffffffb1c49d8e>] rcu_lock_acquire+0x0/0x20
[ 476.191726] #3: (rcu_read_lock){....}, at: [<ffffffffb1d20cf1>] rcu_read_lock+0x0/0x68
[ 476.210386]
[ 476.210386] stack backtrace:
[ 476.221700] CPU: 0 PID: 4672 Comm: iperf3 Not tainted 4.14.0-rc5-00265-ga6ca7ab #22
[ 476.239227] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
[ 476.257892] Call Trace:
[ 476.264575] <IRQ>
[ 476.270468] dump_stack+0x82/0xb8
[ 476.278802] lockdep_rcu_suspicious+0xea/0xf3
[ 476.289295] inet_csk_route_req+0x60/0x181
[ 476.299213] ? kvm_sched_clock_read+0x9/0x12
[ 476.309352] tcp_v4_route_req+0xe/0x10
[ 476.445889] tcp_conn_request+0x3da/0x764
[ 476.455738] ? __local_bh_enable_ip+0x88/0x92
[ 476.466143] ? kvm_clock_read+0x25/0x2e
[ 476.475541] tcp_v4_conn_request+0x40/0x51
[ 476.485517] ? tcp_v4_conn_request+0x40/0x51
[ 476.495693] tcp_v6_conn_request+0x1d/0x62
[ 476.505482] tcp_rcv_state_process+0x98/0xab6
[ 476.515847] ? sk_filter_trim_cap+0x2f8/0x30a
[ 476.526379] tcp_v4_do_rcv+0x124/0x172
[ 476.535393] ? tcp_v4_do_rcv+0x124/0x172
[ 476.545010] tcp_v4_rcv+0x4a7/0x795
[ 476.553826] ip_local_deliver_finish+0x121/0x19e
[ 476.564754] ip_local_deliver+0x63/0x7f
[ 476.574149] ip_rcv_finish+0x310/0x390
[ 476.583509] ip_rcv+0x2c3/0x2f8
[ 476.591646] __netif_receive_skb_core+0x3ee/0x6e9
[ 476.602634] ? lock_acquire+0x125/0x1be
[ 476.612029] ? lock_acquire+0x145/0x1be
[ 476.621459] __netif_receive_skb+0x59/0x5e
[ 476.631310] ? __netif_receive_skb+0x59/0x5e
[ 476.641775] process_backlog+0xa9/0x150
[ 476.651173] net_rx_action+0x100/0x260
[ 476.660539] __do_softirq+0x1a7/0x40e
[ 476.669644] ? rcu_read_unlock_bh+0x3e/0x69
[ 476.679596] do_softirq_own_stack+0x2a/0x40
[ 476.689678] </IRQ>
[ 476.695735] do_softirq+0x74/0x79
[ 476.704101] __local_bh_enable_ip+0x7c/0x92
[ 476.714270] rcu_read_unlock_bh+0x67/0x69
[ 476.724031] ip_finish_output2+0x3fb/0x427
[ 476.739685] ip_finish_output+0x12c/0x13c
[ 476.748563] ? ip_finish_output+0x12c/0x13c
[ 476.758511] ip_output+0x5c/0x8c
[ 476.766810] dst_output+0x2b/0x30
[ 476.773713] ip_local_out+0x2f/0x36
[ 476.781977] ip_queue_xmit+0x2ec/0x328
[ 476.791277] tcp_transmit_skb+0x740/0x791
[ 476.799766] tcp_connect+0x624/0x6b7
[ 476.808026] tcp_v4_connect+0x463/0x4ab
[ 476.817433] __inet_stream_connect+0xb8/0x2a7
[ 476.826175] ? __local_bh_enable_ip+0x8d/0x92
[ 476.835540] ? lock_sock_nested+0x8f/0x9a
[ 476.845268] inet_stream_connect+0x39/0x4d
[ 476.853434] SYSC_connect+0x87/0xb1
[ 476.861498] ? entry_SYSCALL_64_fastpath+0x5/0xbe
[ 476.872519] ? trace_hardirqs_on_caller+0x179/0x195
[ 476.883081] ? trace_hardirqs_on_thunk+0x1a/0x1c
[ 476.893774] SyS_connect+0xe/0x10
[ 476.902200] entry_SYSCALL_64_fastpath+0x1f/0xbe
[ 476.912729] RIP: 0033:0x7faa9754ff20
[ 476.921286] RSP: 002b:00007ffe5ad38c38 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
[ 476.937852] RAX: ffffffffffffffda RBX: ffffffffb0128e85 RCX: 00007faa9754ff20
[ 476.952823] RDX: 0000000000000010 RSI: 00005625f5f0f800 RDI: 0000000000000004
[ 476.968311] RBP: ffffb53882e97f98 R08: 0000000000000003 R09: 0000000000005114
[ 476.983472] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000046
[ 476.998442] R13: 00007ffe5ad388b2 R14: 00007ffe5ad388b0 R15: 00005625f5f0f438
[ 477.013579] ? trace_hardirqs_off_caller+0x3f/0xa1
[ 479.316420] /lkp/lkp/src/tests/iperf: 18: /lkp/lkp/src/tests/iperf: cannot create /inn/result/iperf/300s-cs-localhost-tcp/vm-lkp-wsx03-1G/debian-x86_64-2016-08-31.cgz/x86_64-allyesdebian/gcc-6/a6ca7abe53633d08eea1c6756cb49c9b2d4c90bf/0/reproduce.sh: Input/output error
[ 479.316514]
[ 780.487290] {
[ 780.487358]
[ 780.597209] "start": {
[ 780.597250]
[ 780.737957] "connected": [{
[ 780.738084]
[ 780.954129] "socket": 5,
[ 780.954196]
[ 781.075201] "local_host": "127.0.0.1",
[ 781.075269]
[ 781.231436] "local_port": 53606,
[ 781.231503]
[ 781.474725] "remote_host": "127.0.0.1",
[ 781.474793]
[ 781.685930] "remote_port": 5201
[ 781.685998]
[ 781.851007] }],
To reproduce:
git clone https://github.com/intel/lkp-tests.git
cd lkp-tests
bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email
Thanks,
Xiaolong
View attachment "config-4.14.0-rc5-00265-ga6ca7ab" of type "text/plain" (162996 bytes)
View attachment "job-script" of type "text/plain" (6725 bytes)
Download attachment "dmesg.xz" of type "application/x-xz" (38764 bytes)
View attachment "iperf" of type "text/plain" (144107 bytes)
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