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Date: Mon, 21 May 2018 13:38:42 +0800
From: kernel test robot <xiaolong.ye@...el.com>
To: Amritha Nambiar <amritha.nambiar@...el.com>
Cc: netdev@...r.kernel.org, davem@...emloft.net,
alexander.h.duyck@...el.com, amritha.nambiar@...el.com,
sridhar.samudrala@...el.com, edumazet@...gle.com,
hannes@...essinduktion.org, tom@...bertland.com, lkp@...org
Subject: [lkp-robot] [net] 3416099d53:
net/core/dev.c:#suspicious_rcu_dereference_protected()usage
FYI, we noticed the following commit (built with gcc-6):
commit: 3416099d53d9593ab1d374180e9cd2a71fa2f4d5 ("net: Refactor XPS for CPUs and Rx queues")
url: https://github.com/0day-ci/linux/commits/Amritha-Nambiar/net-Refactor-XPS-for-CPUs-and-Rx-queues/20180518-053915
in testcase: boot
on test machine: qemu-system-x86_64 -enable-kvm -smp 2 -m 512M
caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
+--------------------------------------------------------------------+------------+------------+
| | b9f672af14 | 3416099d53 |
+--------------------------------------------------------------------+------------+------------+
| boot_successes | 0 | 0 |
| boot_failures | 8 | 8 |
| WARNING:at_lib/debugobjects.c:#__debug_object_init | 8 | 8 |
| RIP:__debug_object_init | 8 | 8 |
| WARNING:suspicious_RCU_usage | 8 | 8 |
| lib/test_rhashtable.c:#suspicious_rcu_dereference_protected()usage | 8 | 8 |
| net/core/dev.c:#suspicious_rcu_dereference_protected()usage | 0 | 4 |
+--------------------------------------------------------------------+------------+------------+
[ 26.138522] WARNING: suspicious RCU usage
[ 26.139128] 4.17.0-rc4-01248-g3416099 #1 Tainted: G W
[ 26.140140] -----------------------------
[ 26.140727] net/core/dev.c:2260 suspicious rcu_dereference_protected() usage!
[ 26.142028]
[ 26.142028] other info that might help us debug this:
[ 26.142028]
[ 26.143388]
[ 26.143388] rcu_scheduler_active = 2, debug_locks = 1
[ 26.144263] 3 locks held by netifd/973:
[ 26.144830] #0: (ptrval) (sb_writers#4){.+.+}, at: vfs_write+0xcd/0x1b0
[ 26.145825] #1: (ptrval) (&of->mutex){+.+.}, at: kernfs_fop_write+0xb1/0x170
[ 26.146930] #2: (ptrval) (kn->count#17){.+.+}, at: kernfs_fop_write+0xba/0x170
[ 26.148084]
[ 26.148084] stack backtrace:
[ 26.148655] CPU: 1 PID: 973 Comm: netifd Tainted: G W 4.17.0-rc4-01248-g3416099 #1
[ 26.149799] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
[ 26.150951] Call Trace:
[ 26.151288] dump_stack+0xb0/0x10b
[ 26.151741] __netif_set_xps_queue+0x1cb/0xc00
[ 26.152350] ? __bitmap_parse+0x14d/0x1c0
[ 26.152938] xps_cpus_store+0x9f/0xe0
[ 26.153421] kernfs_fop_write+0xf0/0x170
[ 26.153947] __vfs_write+0x33/0x140
[ 26.154410] ? rcu_read_lock_sched_held+0x5f/0x90
[ 26.155123] ? rcu_sync_lockdep_assert+0x28/0x50
[ 26.155744] ? __sb_start_write+0x14e/0x1c0
[ 26.156310] ? vfs_write+0xcd/0x1b0
[ 26.156783] vfs_write+0xdf/0x1b0
[ 26.157247] ksys_write+0x55/0xc0
[ 26.157699] do_int80_syscall_32+0x73/0x220
[ 26.158264] entry_INT80_compat+0x71/0x80
[ 26.165010] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 26.167173] 8021q: adding VLAN 0 to HW filter on device eth0
LKP: HOSTNAME vm-lkp-nex04-openwrt-ia32-19, MAC , kernel 4.17.0-rc4-01248-g3416099 1, serial console /dev/ttyS0
[ 27.410153] Kernel tests: Boot OK!
[ 27.410153] LKP: waiting for network...
[ 28.230718] e1000: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX
[ 28.233430] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[ 29.430135] /lkp/lkp/src/bin/run-lkp
[ 29.430135] RESULT_ROOT=/result/boot/1/vm-lkp-nex04-openwrt-ia32/openwrt-i386-2016-03-16.cgz/x86_64-randconfig-s1-05191730/gcc-6/3416099d53d9593ab1d374180e9cd2a71fa2f4d5/0
[ 29.430135] job=/lkp/scheduled/vm-lkp-nex04-openwrt-ia32-19/boot-1-openwrt-i386-2016-03-16.cgz-3416099d53d9593ab1d374180e9cd2a71fa2f4d5-20180519-65944-14mjjk6-0.yaml
[ 29.430135] run-job /lkp/scheduled/vm-lkp-nex04-openwrt-ia32-19/boot-1-openwrt-i386-2016-03-16.cgz-3416099d53d9593ab1d374180e9cd2a71fa2f4d5-20180519-65944-14mjjk6-0.yaml
[ 29.430135] /bin/busybox wget -q http://inn:80/~lkp/cgi-bin/lkp-jobfile-append-var?job_file=/lkp/scheduled/vm-lkp-nex04-openwrt-ia32-19/boot-1-openwrt-i386-2016-03-16.cgz-3416099d53d9593ab1d374180e9cd2a71fa2f4d5-20180519-65944-14mjjk6-0.yaml&job_state=running -O /dev/null
[ 29.430135] skip microcode check for virtual machine
[ 31.470090] /bin/busybox wget -q http://inn:80/~lkp/cgi-bin/lkp-jobfile-append-var?job_file=/lkp/scheduled/vm-lkp-nex04-openwrt-ia32-19/boot-1-openwrt-i386-2016-03-16.cgz-3416099d53d9593ab1d374180e9cd2a71fa2f4d5-20180519-65944-14mjjk6-0.yaml&job_state=post_run -O /dev/null
[ 32.679099] cat (1334) used greatest stack depth: 13344 bytes left
[ 33.490117] kill 1334 cat /proc/kmsg
[ 33.490117] wait for background monitors: 1344 oom-killer
[ 35.264972] sysrq: SysRq : Emergency Sync
[ 35.266203] sysrq: SysRq : Resetting
[ 35
Elapsed time: 40
#!/bin/bash
# To reproduce,
# 1) save job-script and this script (both are attached in 0day report email)
# 2) run this script with your compiled kernel and optional env $INSTALL_MOD_PATH
kernel=$1
initrds=(
/osimage/openwrt/openwrt-i386-2016-03-16.cgz
/lkp/lkp/lkp-i386.cgz
)
HTTP_PREFIX=https://github.com/0day-ci/lkp-qemu/raw/master
wget --timestamping "${initrds[@]/#/$HTTP_PREFIX}"
{
cat "${initrds[@]//*\//}"
[[ $INSTALL_MOD_PATH ]] && (
cd "$INSTALL_MOD_PATH"
find lib | cpio -o -H newc --quiet | gzip
)
echo job-script | cpio -o -H newc --quiet | gzip
} > initrd.img
kvm=(
qemu-system-x86_64
-enable-kvm
-kernel $kernel
-initrd initrd.img
-m 512
-smp 2
-device e1000,netdev=net0
-netdev user,id=net0,hostfwd=tcp::23288-:22
-boot order=nc
-no-reboot
-watchdog i6300esb
-watchdog-action debug
-rtc base=localtime
-serial stdio
-display none
-monitor null
)
append=(
ip=::::vm-lkp-nex04-openwrt-ia32-19::dhcp
root=/dev/ram0
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-4.17.0-rc4-01248-g3416099" of type "text/plain" (114031 bytes)
View attachment "job-script" of type "text/plain" (4022 bytes)
Download attachment "dmesg.xz" of type "application/x-xz" (17716 bytes)
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