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Date: Thu, 21 Dec 2017 09:35:55 +0800
From: kernel test robot <fengguang.wu@...el.com>
To: Florian Westphal <fw@...len.de>
Cc: Pablo Neira Ayuso <pablo@...filter.org>,
Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
LKML <linux-kernel@...r.kernel.org>,
Stephen Rothwell <sfr@...b.auug.org.au>, lkp@...org
Subject: [netfilter] 8f5216c927: WARNING:suspicious_RCU_usage
FYI, we noticed the following commit (built with gcc-7):
commit: 8f5216c9271b8ca375dc6d8bc31540f622cd5e65 ("netfilter: ipset: use nfnl_mutex_is_locked")
https://git.kernel.org/cgit/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 -m 512M
caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
+--------------------------------------------------------------------------------+------------+------------+
| | eef8fd03a4 | 8f5216c927 |
+--------------------------------------------------------------------------------+------------+------------+
| boot_successes | 8 | 4 |
| boot_failures | 0 | 7 |
| WARNING:suspicious_RCU_usage | 0 | 7 |
| net/netfilter/ipset/ip_set_core.c:#suspicious_rcu_dereference_protected()usage | 0 | 7 |
+--------------------------------------------------------------------------------+------------+------------+
[ 31.564950] WARNING: suspicious RCU usage
[ 31.565382] 4.14.0-rc8-02447-g8f5216c #25 Not tainted
[ 31.565898] -----------------------------
[ 31.566333] net/netfilter/ipset/ip_set_core.c:2059 suspicious rcu_dereference_protected() usage!
[ 31.567340]
[ 31.567340] other info that might help us debug this:
[ 31.567340]
[ 31.568466]
[ 31.568466] rcu_scheduler_active = 2, debug_locks = 1
[ 31.569164] 3 locks held by kworker/u2:2/131:
[ 31.569621] #0: ("%s""netns"){+.+.}, at: [<ffffffff8b0ff9cb>] process_one_work+0x132/0x49f
[ 31.570492] #1: (net_cleanup_work){+.+.}, at: [<ffffffff8b0ff9cb>] process_one_work+0x132/0x49f
[ 31.571375] #2: (net_mutex){+.+.}, at: [<ffffffff8cc1fede>] cleanup_net+0x7e/0x232
[ 31.574390]
[ 31.574390] stack backtrace:
[ 31.574903] CPU: 0 PID: 131 Comm: kworker/u2:2 Not tainted 4.14.0-rc8-02447-g8f5216c #25
[ 31.575728] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
[ 31.576563] Workqueue: netns cleanup_net
[ 31.576988] Call Trace:
[ 31.577295] dump_stack+0x8a/0xc0
[ 31.577669] lockdep_rcu_suspicious+0xea/0xf3
[ 31.578134] ip_set_net_exit+0x6e/0xec
[ 31.578543] ops_exit_list+0x42/0x53
[ 31.578935] cleanup_net+0x199/0x232
[ 31.579538] process_one_work+0x291/0x49f
[ 31.580074] ? rescuer_thread+0x278/0x278
[ 31.580562] worker_thread+0x1a0/0x260
[ 31.580977] ? rescuer_thread+0x278/0x278
[ 31.581413] kthread+0x106/0x10e
[ 31.581774] ? __list_del_entry+0x22/0x22
[ 31.582207] ? call_usermodehelper+0x45/0x45
[ 31.582657] ? call_usermodehelper_exec_async+0x124/0x12d
[ 31.583205] ret_from_fork+0x2a/0x40
[ 325.073586] sysrq: SysRq : Emergency Sync
[ 325.075536] Emergency Sync complete
[ 325.077366] sysrq: SysRq : Resetting
Elapsed time: 330
#!/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=$1
initrds=(
/osimage/yocto/yocto-minimal-x86_64-2016-04-22.cgz
/lkp/lkp/lkp-x86_64.cgz
/osimage/pkg/debian-x86_64-2016-08-31.cgz/trinity-static-x86_64-x86_64-6ddabfd2_2017-11-10.cgz
)
HTTP_PREFIX=https://github.com/0day-ci/lkp-qemu/raw/master
wget --timestamping "${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
qemu-img create -f qcow2 disk-vm-lkp-hsw01-yocto-x86_64-7-0 256G
kvm=(
qemu-system-x86_64
-enable-kvm
-kernel $kernel
-initrd initrd.img
-m 1024
-smp 1
-device e1000,netdev=net0
-netdev user,id=net0
-boot order=nc
-no-reboot
-watchdog i6300esb
-watchdog-action debug
-rtc base=localtime
-drive file=disk-vm-lkp-hsw01-yocto-x86_64-7-0,media=disk,if=virtio
-serial stdio
-display none
-monitor null
)
append=(
ip=::::vm-lkp-hsw01-yocto-x86_64-7::dhcp
root=/dev/ram0
user=lkp
job=/job-script
ARCH=x86_64
kconfig=x86_64-allyesdebian
branch=linux-next/master
commit=8f5216c9271b8ca375dc6d8bc31540f622cd5e65
BOOT_IMAGE=/pkg/linux/x86_64-allyesdebian/gcc-7/8f5216c9271b8ca375dc6d8bc31540f622cd5e65/vmlinuz-4.14.0-rc8-02447-g8f5216c
max_uptime=1500
RESULT_ROOT=/result/trinity/300s/vm-lkp-hsw01-yocto-x86_64/yocto-minimal-x86_64-2016-04-22.cgz/x86_64-allyesdebian/gcc-7/8f5216c9271b8ca375dc6d8bc31540f622cd5e65/1
result_service=tmpfs
debug
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,
lkp
View attachment "config-4.14.0-rc8-02447-g8f5216c" of type "text/plain" (163663 bytes)
View attachment "job-script" of type "text/plain" (3891 bytes)
Download attachment "dmesg.xz" of type "application/x-xz" (26584 bytes)
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