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Date: Fri, 5 Jul 2019 15:43:04 +0800
From: kernel test robot <rong.a.chen@...el.com>
To: Mahesh Bandewar <maheshb@...gle.com>
Cc: "David S. Miller" <davem@...emloft.net>,
LKML <linux-kernel@...r.kernel.org>,
Stephen Rothwell <sfr@...b.auug.org.au>, lkp@...org
Subject: [loopback] 4de83b88c6: WARNING:suspicious_RCU_usage
FYI, we noticed the following commit (built with gcc-7):
commit: 4de83b88c66a1e4dba426b29766fb68e61d93792 ("loopback: create blackhole net device similar to loopack.")
https://kernel.googlesource.com/pub/scm/linux/kernel/git/next/linux-next.git master
in testcase: trinity
with following parameters:
runtime: 300s
test-description: Trinity is a linux system call fuzz tester.
test-url: http://codemonkey.org.uk/projects/trinity/
on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 2G
caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
+------------------------------------------------------------------------+------------+------------+
| | 8909783cb5 | 4de83b88c6 |
+------------------------------------------------------------------------+------------+------------+
| boot_successes | 14 | 0 |
| boot_failures | 2 | 10 |
| BUG:kernel_hang_in_boot-around-mounting-root_stage | 1 | |
| IP-Config:Auto-configuration_of_network_failed | 1 | 1 |
| WARNING:suspicious_RCU_usage | 0 | 10 |
| include/linux/rtnetlink.h:#suspicious_rcu_dereference_protected()usage | 0 | 10 |
+------------------------------------------------------------------------+------------+------------+
If you fix the issue, kindly add following tag
Reported-by: kernel test robot <rong.a.chen@...el.com>
[ 14.675051] WARNING: suspicious RCU usage
[ 14.675847] 5.2.0-rc6-01699-g4de83b8 #1 Tainted: G T
[ 14.676977] -----------------------------
[ 14.677767] include/linux/rtnetlink.h:85 suspicious rcu_dereference_protected() usage!
[ 14.679506]
[ 14.679506] other info that might help us debug this:
[ 14.679506]
[ 14.681054]
[ 14.681054] rcu_scheduler_active = 2, debug_locks = 1
[ 14.682294] no locks held by swapper/0/1.
[ 14.683126]
[ 14.683126] stack backtrace:
[ 14.684050] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G T 5.2.0-rc6-01699-g4de83b8 #1
[ 14.685659] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
[ 14.687184] Call Trace:
[ 14.687749] dump_stack+0x7c/0xc3
[ 14.688437] dev_init_scheduler+0xd7/0x190
[ 14.689246] ? net_olddevs_init+0x5d/0x5d
[ 14.690051] ? do_early_param+0xb3/0xb3
[ 14.690821] blackhole_netdev_init+0x42/0x85
[ 14.691647] do_one_initcall+0x17c/0x380
[ 14.692432] ? initcall_blacklisted+0x150/0x150
[ 14.693106] ? lock_downgrade+0x250/0x2b0
[ 14.693106] ? lock_acquire+0x1b6/0x1f0
[ 14.693106] ? do_early_param+0xb3/0xb3
[ 14.693106] kernel_init_freeable+0x3a6/0x45e
[ 14.693106] ? rest_init+0x240/0x240
[ 14.693106] kernel_init+0xf/0x120
[ 14.693106] ? _raw_spin_unlock_irq+0x34/0x50
[ 14.693106] ? rest_init+0x240/0x240
[ 14.693106] ret_from_fork+0x24/0x30
[ 14.703089] e1000: Intel(R) PRO/1000 Network Driver - version 7.3.21-k8-NAPI
[ 14.704437] e1000: Copyright (c) 1999-2006 Intel Corporation.
[ 18.732818] PCI Interrupt Link [LNKC] enabled at IRQ 11
[ 19.159911] e1000 0000:00:03.0 eth0: (PCI:33MHz:32-bit) 52:54:00:12:34:56
[ 19.161267] e1000 0000:00:03.0 eth0: Intel(R) PRO/1000 Network Connection
[ 24.301353] rcu-perf: rcu_perf_writer 1 has 100 measurements
[ 24.303083] rcu-perf: rcu_perf_writer 0 has 100 measurements
[ 24.413125] Dumping ftrace buffer:
[ 24.414212] (ftrace buffer empty)
[ 24.414980] rcu-perf: Test complete
[ 27.308838] e1000 0000:00:03.0 eth0: (PCI:33MHz:32-bit) 52:54:00:12:34:56
[ 27.310641] e1000 0000:00:03.0 eth0: Intel(R) PRO/1000 Network Connection
[ 27.313807] usbcore: registered new interface driver usbtmc
[ 27.315047] usbcore: registered new interface driver usb-storage
[ 27.316263] usbcore: registered new interface driver ums_eneub6250
[ 27.317604] usbcore: registered new interface driver adutux
[ 27.318784] usbcore: registered new interface driver appledisplay
[ 27.320032] usbcore: registered new interface driver cytherm
[ 27.321206] usbcore: registered new interface driver emi26 - firmware loader
[ 27.322593] usbcore: registered new interface driver iowarrior
[ 27.323906] usbcore: registered new interface driver isight_firmware
[ 27.325189] usbcore: registered new interface driver usblcd
[ 27.326348] usbcore: registered new interface driver legousbtower
[ 27.327594] usbcore: registered new interface driver rio500
[ 27.328824] usbcore: registered new interface driver usbtest
[ 27.330009] usbcore: registered new interface driver lvs
[ 27.331820] i8042: PNP: PS/2 Controller [PNP0303:KBD,PNP0f13:MOU] at 0x60,0x64 irq 1,12
[ 27.335179] serio: i8042 KBD port at 0x60,0x64 irq 1
[ 27.336854] serio: i8042 AUX port at 0x60,0x64 irq 12
[ 27.340657] input: AT Translated Set 2 keyboard as /devices/platform/i8042/serio0/input/input0
[ 27.345403] usbcore: registered new interface driver xpad
[ 27.346683] usbcore: registered new interface driver gtco
[ 27.347836] usbcore: registered new interface driver pegasus_notetaker
[ 27.350101] mk712: device not present
[ 27.351056] usbcore: registered new interface driver usbtouchscreen
[ 27.353198] usbcore: registered new interface driver ati_remote2
[ 27.354824] usbcore: registered new interface driver keyspan_remote
[ 27.358901] rtc_cmos 00:00: RTC can wake from S4
[ 27.362193] rtc rtc0: alarm rollover: day
[ 27.363910] rtc_cmos 00:00: char device (0:0)
[ 27.363914] input: AT Translated Set 2 keyboard as /devices/platform/i8042/serio0/input/input1
[ 27.364984] rtc_cmos 00:00: registered as rtc0
[ 27.368376] rtc_cmos 00:00: alarms up to one day, y3k, 114 bytes nvram, hpet irqs
[ 27.371730] rtc_cmos 00:00: RTC can wake from S4
[ 27.373382] rtc rtc1: alarm rollover: day
[ 27.376906] rtc_cmos 00:00: char device (0:1)
[ 27.378153] rtc_cmos 00:00: registered as rtc1
[ 27.379656] rtc_cmos 00:00: alarms up to one day, y3k, 114 bytes nvram, hpet irqs
[ 27.384627] i2c /dev entries driver
[ 27.385769] i2c-parport-light: adapter type unspecified
[ 27.387136] usbcore: registered new interface driver RobotFuzz Open Source InterFace, OSIF
[ 27.389221] usbcore: registered new interface driver i2c-tiny-usb
[ 27.391172] IR Sharp protocol handler initialized
[ 27.392282] ir_imon_decoder: IR iMON protocol handler initialized
[ 27.393738] IR RCMM protocol handler initialized
[ 27.394834] Driver for 1-wire Dallas network protocol.
[ 27.399165] intel_powerclamp: CPU does not support MWAIT
[ 27.400646] advantechwdt: WDT driver for Advantech single board computer initialising
[ 27.403903] advantechwdt: initialized. timeout=60 sec (nowayout=1)
[ 27.405481] ib700wdt: WDT driver for IB700 single board computer initialising
[ 27.407789] ib700wdt: START method I/O 443 is not available
[ 27.409106] ib700wdt: probe of ib700wdt failed with error -5
[ 27.411021] it87_wdt: no device
[ 27.411836] pc87413_wdt: Version 1.1 at io 0x2E
[ 27.412931] pc87413_wdt: cannot register miscdev on minor=130 (err=-16)
[ 27.414580] w83877f_wdt: I/O address 0x0443 already in use
[ 27.415849] w83977f_wdt: driver v1.00
[ 27.416776] w83977f_wdt: cannot register miscdev on minor=130 (err=-16)
[ 27.418248] machzwd: MachZ ZF-Logic Watchdog driver initializing
[ 27.419607] machzwd: no ZF-Logic found
To reproduce:
# build kernel
cd linux
cp config-5.2.0-rc6-01699-g4de83b8 .config
make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 olddefconfig prepare modules_prepare bzImage
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,
Rong Chen
View attachment "config-5.2.0-rc6-01699-g4de83b8" of type "text/plain" (132540 bytes)
View attachment "job-script" of type "text/plain" (4333 bytes)
Download attachment "dmesg.xz" of type "application/x-xz" (14188 bytes)
View attachment "trinity" of type "text/plain" (56 bytes)
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