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Date: Tue, 27 Oct 2020 21:16:24 +0800
From: kernel test robot <lkp@...el.com>
To: Geliang Tang <geliangtang@...il.com>
Cc: Jenkins Tessares <jenkins@...sares.net>,
Paolo Abeni <pabeni@...hat.com>,
LKML <linux-kernel@...r.kernel.org>, mptcp@...ts.01.org,
lkp@...ts.01.org, lkp@...el.com
Subject: [selftests] f2ff7f11f9: WARNING:suspicious_RCU_usage
Greeting,
FYI, we noticed the following commit (built with gcc-9):
commit: f2ff7f11f9a74842245db52d685bf9bc7ac2c4b1 ("selftests: mptcp: add ADD_ADDR IPv6 test cases")
https://github.com/multipath-tcp/mptcp_net-next.git export
in testcase: kernel-selftests
version: kernel-selftests-x86_64-b5a583fb-1_20201015
with following parameters:
group: kselftests-mptcp
ucode: 0xdc
test-description: The kernel contains a set of "self tests" under the tools/testing/selftests/ directory. These are intended to be small unit tests to exercise individual code paths in the kernel.
test-url: https://www.kernel.org/doc/Documentation/kselftest.txt
on test machine: 8 threads Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz with 28G memory
caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
If you fix the issue, kindly add following tag
Reported-by: kernel test robot <lkp@...el.com>
[ 229.193156] WARNING: suspicious RCU usage
[ 229.197723] 5.9.0-13449-gf2ff7f11f9a7 #1 Tainted: G I
[ 229.204734] -----------------------------
[ 229.209277] include/net/sock.h:1915 suspicious rcu_dereference_check() usage!
[ 229.216990]
[ 229.216990] other info that might help us debug this:
[ 229.216990]
[ 229.226621]
[ 229.226621] rcu_scheduler_active = 2, debug_locks = 1
[ 229.234252] 3 locks held by kworker/2:1/64:
[ 229.239016] #0: ffff888100054938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x1be/0x580
[ 229.249063] #1: ffffc9000029fe58 ((work_completion)(&msk->work)){+.+.}-{0:0}, at: process_one_work+0x1be/0x580
[ 229.259745] #2: ffff888750f14c60 (sk_lock-AF_INET6){+.+.}-{0:0}, at: mptcp_worker+0x47/0x900
[ 229.268913]
[ 229.268913] stack backtrace:
[ 229.274409] CPU: 2 PID: 64 Comm: kworker/2:1 Tainted: G I 5.9.0-13449-gf2ff7f11f9a7 #1
[ 229.284150] Hardware name: Dell Inc. OptiPlex 7040/0Y7WYT, BIOS 1.2.8 01/26/2016
[ 229.292076] Workqueue: events mptcp_worker
[ 229.296740] Call Trace:
[ 229.299765] dump_stack+0x8d/0xb5
[ 229.303631] __sk_dst_check+0xa7/0xe0
[ 229.307860] inet6_csk_route_socket+0x1a5/0x440
[ 229.312963] ? inet6_csk_xmit+0x58/0x240
[ 229.317401] inet6_csk_xmit+0x58/0x240
[ 229.321703] __tcp_transmit_skb+0x571/0xc80
[ 229.326421] mptcp_pm_check_send_dedicated_add_addr_packet+0x4c/0x80
[ 229.333929] mptcp_pm_create_subflow_or_signal_addr+0x659/0x700
[ 229.340370] mptcp_worker+0x68a/0x900
[ 229.344553] process_one_work+0x23e/0x580
[ 229.349134] worker_thread+0x50/0x3c0
[ 229.353324] ? process_one_work+0x580/0x580
[ 229.358076] kthread+0x133/0x180
[ 229.361883] ? kthread_park+0xa0/0xa0
[ 229.366100] ret_from_fork+0x22/0x30
[ 234.629864] # 19 unused signal address IPv6 syn[ ok ] - synack[ ok ] - ack[ ok ]
[ 234.629869]
[ 234.646748] # add[fail] got 0 ADD_ADDR[s] expected 1
[ 234.646753]
[ 234.663869] # - echo [fail] got 0 ADD_ADDR echo[s] expected 1
[ 234.663874]
[ 234.672854] # Server ns stats
[ 234.672858]
[ 234.680940] # MPTcpExtMPCapableSYNRX 1 0.0
[ 234.680945]
[ 234.691230] # MPTcpExtMPCapableACKRX 1 0.0
[ 234.691234]
[ 234.701766] # MPTcpExtMPTCPRetrans 5 0.0
[ 234.701770]
[ 234.712131] # MPTcpExtDuplicateData 1 0.0
[ 234.712135]
[ 234.721565] # Client ns stats
[ 234.721569]
[ 234.728499] # MPTcpExtMPTCPRetrans 1 0.0
[ 234.728503]
[ 234.739086] # MPTcpExtDuplicateData 5 0.0
[ 234.739090]
[ 234.840939] IPv6: ADDRCONF(NETDEV_CHANGE): ns1eth1: link becomes ready
[ 234.878710] IPv6: ADDRCONF(NETDEV_CHANGE): ns1eth2: link becomes ready
[ 234.916540] IPv6: ADDRCONF(NETDEV_CHANGE): ns1eth3: link becomes ready
[ 234.954915] IPv6: ADDRCONF(NETDEV_CHANGE): ns1eth4: link becomes ready
[ 235.841647] IPv6: ADDRCONF(NETDEV_CHANGE): ns2eth1: link becomes ready
[ 241.248714] # 20 single address IPv6 syn[ ok ] - synack[ ok ] - ack[ ok ]
[ 241.248720]
[ 241.274168] # add[ ok ] - echo [ ok ]
[ 241.274174]
[ 241.397805] IPv6: ADDRCONF(NETDEV_CHANGE): ns1eth1: link becomes ready
[ 241.435917] IPv6: ADDRCONF(NETDEV_CHANGE): ns1eth2: link becomes ready
[ 241.474418] IPv6: ADDRCONF(NETDEV_CHANGE): ns1eth3: link becomes ready
[ 241.512504] IPv6: ADDRCONF(NETDEV_CHANGE): ns1eth4: link becomes ready
[ 242.433629] IPv6: ADDRCONF(NETDEV_CHANGE): ns2eth1: link becomes ready
[ 247.824119] # 21 signal address, ADD_ADDR6 timeout syn[ ok ] - synack[ ok ] - ack[ ok ]
[ 247.824125]
[ 247.850751] # add[ ok ] - echo [ ok ]
[ 247.850756]
[ 247.976931] IPv6: ADDRCONF(NETDEV_CHANGE): ns1eth1: link becomes ready
[ 248.014492] IPv6: ADDRCONF(NETDEV_CHANGE): ns1eth2: link becomes ready
[ 248.052311] IPv6: ADDRCONF(NETDEV_CHANGE): ns1eth3: link becomes ready
[ 248.090896] IPv6: ADDRCONF(NETDEV_CHANGE): ns1eth4: link becomes ready
[ 248.961779] IPv6: ADDRCONF(NETDEV_CHANGE): ns2eth1: link becomes ready
[ 254.389366] # 22 remove single address IPv6 syn[ ok ] - synack[ ok ] - ack[ ok ]
[ 254.389372]
[ 254.414626] # add[ ok ] - echo [ ok ]
[ 254.414631]
[ 254.439555] # rm [ ok ] - sf [ ok ]
[ 254.439560]
[ 254.563953] IPv6: ADDRCONF(NETDEV_CHANGE): ns1eth1: link becomes ready
[ 254.601725] IPv6: ADDRCONF(NETDEV_CHANGE): ns1eth2: link becomes ready
[ 254.639744] IPv6: ADDRCONF(NETDEV_CHANGE): ns1eth3: link becomes ready
[ 254.677730] IPv6: ADDRCONF(NETDEV_CHANGE): ns1eth4: link becomes ready
[ 255.553706] IPv6: ADDRCONF(NETDEV_CHANGE): ns2eth1: link becomes ready
[ 260.988434] # 23 remove subflow and signal IPv6 syn[ ok ] - synack[ ok ] - ack[ ok ]
[ 260.988440]
[ 261.014261] # add[ ok ] - echo [ ok ]
[ 261.014267]
[ 261.038447] # rm [ ok ] - sf [ ok ]
[ 261.038452]
[ 261.162474] IPv6: ADDRCONF(NETDEV_CHANGE): ns1eth1: link becomes ready
[ 261.200463] IPv6: ADDRCONF(NETDEV_CHANGE): ns1eth2: link becomes ready
[ 261.238952] IPv6: ADDRCONF(NETDEV_CHANGE): ns1eth3: link becomes ready
[ 261.276707] IPv6: ADDRCONF(NETDEV_CHANGE): ns1eth4: link becomes ready
[ 262.145701] IPv6: ADDRCONF(NETDEV_CHANGE): ns2eth1: link becomes ready
To reproduce:
git clone https://github.com/intel/lkp-tests.git
cd lkp-tests
bin/lkp install job.yaml # job file is attached in this email
bin/lkp run job.yaml
Thanks,
lkp
View attachment "config-5.9.0-13449-gf2ff7f11f9a7" of type "text/plain" (211431 bytes)
View attachment "job-script" of type "text/plain" (6523 bytes)
View attachment "dmesg" of type "text/plain" (209194 bytes)
View attachment "kernel-selftests" of type "text/plain" (51881 bytes)
View attachment "job.yaml" of type "text/plain" (5599 bytes)
View attachment "reproduce" of type "text/plain" (172 bytes)
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