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Date: Sun, 4 Oct 2020 20:56:19 +0800
From: kernel test robot <lkp@...el.com>
To: Al Viro <viro@...IV.linux.org.uk>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
Marc Zyngier <maz@...nel.org>, 0day robot <lkp@...el.com>,
lkp@...ts.01.org
Subject: [ep_insert()] 9ee1cc5666: WARNING:possible_recursive_locking_detected
Greeting,
FYI, we noticed the following commit (built with gcc-9):
commit: 9ee1cc56661640a2ace2f7d0b52dec56b3573c53 ("[RFC PATCH 20/27] ep_insert(): we only need tep->mtx around the insertion itself")
url: https://github.com/0day-ci/linux/commits/Al-Viro/epoll-switch-epitem-pwqlist-to-single-linked-list/20201004-113938
base: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git 22fbc037cd32e4e6771d2271b565806cfb8c134c
in testcase: rcuperf
version:
with following parameters:
runtime: 300s
perf_type: srcud
on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 8G
caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
+---------------------------------------------+------------+------------+
| | 8d7a0bb9bb | 9ee1cc5666 |
+---------------------------------------------+------------+------------+
| boot_successes | 16 | 3 |
| boot_failures | 0 | 7 |
| WARNING:possible_recursive_locking_detected | 0 | 7 |
+---------------------------------------------+------------+------------+
If you fix the issue, kindly add following tag
Reported-by: kernel test robot <lkp@...el.com>
[ 16.956306] WARNING: possible recursive locking detected
[ 16.957162] 5.9.0-rc7-00161-g9ee1cc5666164 #1 Not tainted
[ 16.958165] --------------------------------------------
[ 16.959083] systemd/1 is trying to acquire lock:
[ 16.959879] f6148434 (&ep->mtx){+.+.}-{3:3}, at: do_epoll_ctl+0x516/0x730
[ 16.961051]
[ 16.961051] but task is already holding lock:
[ 16.962000] f6148134 (&ep->mtx){+.+.}-{3:3}, at: epoll_mutex_lock+0xe/0x21
[ 16.963207]
[ 16.963207] other info that might help us debug this:
[ 16.964179] Possible unsafe locking scenario:
[ 16.964179]
[ 16.965106] CPU0
[ 16.965531] ----
[ 16.965976] lock(&ep->mtx);
[ 16.966487] lock(&ep->mtx);
[ 16.967005]
[ 16.967005] *** DEADLOCK ***
[ 16.967005]
[ 16.968023] May be due to missing lock nesting notation
[ 16.968023]
[ 16.969182] 2 locks held by systemd/1:
[ 16.969815] #0: c73ba5d4 (epmutex){+.+.}-{3:3}, at: epoll_mutex_lock+0xe/0x21
[ 16.971187] #1: f6148134 (&ep->mtx){+.+.}-{3:3}, at: epoll_mutex_lock+0xe/0x21
[ 16.972573]
[ 16.972573] stack backtrace:
[ 16.973177] CPU: 0 PID: 1 Comm: systemd Not tainted 5.9.0-rc7-00161-g9ee1cc5666164 #1
[ 16.974433] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
[ 16.975668] Call Trace:
[ 16.976068] dump_stack+0x1b/0x1d
[ 16.976560] validate_chain+0x4ad/0x4f5
[ 16.977206] __lock_acquire+0x726/0x7bf
[ 16.977882] lock_acquire+0x1f3/0x273
[ 16.978525] ? do_epoll_ctl+0x516/0x730
[ 16.979162] ? lock_is_held+0xb/0xd
[ 16.979754] __mutex_lock+0x72/0x1d6
[ 16.980362] ? do_epoll_ctl+0x516/0x730
[ 16.981009] ? rcu_read_lock_sched_held+0x20/0x37
[ 16.981802] ? kmem_cache_alloc+0xed/0x11c
[ 16.982461] mutex_lock_nested+0x14/0x18
[ 16.983148] ? do_epoll_ctl+0x516/0x730
[ 16.983821] do_epoll_ctl+0x516/0x730
[ 16.984457] __ia32_sys_epoll_ctl+0x2b/0x4f
[ 16.985178] do_int80_syscall_32+0x27/0x34
[ 16.985875] entry_INT80_32+0x113/0x113
[ 16.986505] EIP: 0xb7f5fa02
[ 16.987002] Code: 95 01 00 05 25 36 02 00 83 ec 14 8d 80 e8 99 ff ff 50 6a 02 e8 1f ff 00 00 c7 04 24 7f 00 00 00 e8 7e 87 01 00 66 90 90 cd 80 <c3> 8d b6 00 00 00 00 8d bc 27 00 00 00 00 8b 1c 24 c3 8d b6 00 00
[ 16.990076] EAX: ffffffda EBX: 00000004 ECX: 00000001 EDX: 00000009
[ 16.991027] ESI: bfcb6050 EDI: 00000001 EBP: 00000001 ESP: bfcb6030
[ 16.992078] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b EFLAGS: 00000246
[ OK ] Listening on udev Control Socket.
[ OK ] Listening on Syslog Socket.
[ OK ] Listening on RPCbind Server Activation Socket.
[ OK ] Reached target Swap.
[ OK ] Listening on Journal Socket (/dev/log).
[ OK ] Created slice User and Session Slice.
[ OK ] Listening on Journal Socket.
[ OK ] Listening on udev Kernel Socket.
[ OK ] Created slice System Slice.
[ 17.032119] _warn_unseeded_randomness: 199 callbacks suppressed
[ 17.032127] random: get_random_u32 called from copy_process+0x216/0x1349 with crng_init=1
Starting Load Kernel Modules...
Mounting RPC Pipe File System...
[ OK ] Reached target Slices.
[ 17.040073] random: get_random_u32 called from arch_pick_mmap_layout+0x4d/0xd7 with crng_init=1
[ 17.040077] random: get_random_u32 called from randomize_stack_top+0x1b/0x36 with crng_init=1
Starting Create Static Device Nodes in /dev...
[ OK ] Started Dispatch Password Requests to Console Directory Watch.
[ OK ] Listening on /dev/initctl Compatibility Named Pipe.
Starting Journal Service...
Starting Remount Root and Kernel File Systems...
[ OK ] Started Forward Password Requests to Wall Directory Watch.
[ OK ] Reached target Encrypted Volumes.
[ OK ] Reached target Paths.
[ OK ] Created slice system-getty.slice.
[ OK ] Mounted RPC Pipe File System.
[ OK ] Started Load Kernel Modules.
[ OK ] Started Create Static Device Nodes in /dev.
[ OK ] Started Remount Root and Kernel File Systems.
Starting Load/Save Random Seed...
Starting udev Coldplug all Devices...
Starting udev Kernel Device Manager...
[ OK ] Reached target Local File Systems (Pre).
[ OK ] Reached target Local File Systems.
Starting Preprocess NFS configuration...
Mounting Configuration File System...
Mounting FUSE Control File System...
Starting Apply Kernel Variables...
[ OK ] Mounted Configuration File System.
[ OK ] Mounted FUSE Control File System.
[ OK ] Started udev Kernel Device Manager.
[ OK ] Started Load/Save Random Seed.
[ OK ] Started Preprocess NFS configuration.
[ OK ] Started Apply Kernel Variables.
Starting Raise network interfaces...
[ OK ] Reached target NFS client services.
[ OK ] Started Journal Service.
Starting Flush Journal to Persistent Storage...
[ OK ] Started Flush Journal to Persistent Storage.
Starting Create Volatile Files and Directories...
[ OK ] Started Raise network interfaces.
To reproduce:
# build kernel
cd linux
cp config-5.9.0-rc7-00161-g9ee1cc5666164 .config
make HOSTCC=gcc-9 CC=gcc-9 ARCH=i386 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,
lkp
View attachment "config-5.9.0-rc7-00161-g9ee1cc5666164" of type "text/plain" (147009 bytes)
View attachment "job-script" of type "text/plain" (4382 bytes)
Download attachment "dmesg.xz" of type "application/x-xz" (19268 bytes)
View attachment "rcuperf" of type "text/plain" (415 bytes)
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