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Message-ID: <202211151309.1fdf8fd0-oliver.sang@intel.com>
Date: Tue, 15 Nov 2022 15:10:06 +0800
From: kernel test robot <oliver.sang@...el.com>
To: Stephen Brennan <stephen.s.brennan@...cle.com>
CC: <oe-lkp@...ts.linux.dev>, <lkp@...el.com>,
<linux-fsdevel@...r.kernel.org>, Jan Kara <jack@...e.cz>,
<linux-kernel@...r.kernel.org>, Al Viro <viro@...iv.linux.org.uk>,
"Stephen Brennan" <stephen.s.brennan@...cle.com>,
Amir Goldstein <amir73il@...il.com>
Subject: Re: [PATCH v4 4/5] fsnotify: allow sleepable child flag update
Hi, Stephen Brennan, we made report upon v1 patch
https://lore.kernel.org/all/202210271500.731e3808-yujie.liu@intel.com/
now we noticed similar issue still on v4. FYI.
Greeting,
FYI, we noticed WARNING:possible_recursive_locking_detected due to commit (built with gcc-11):
commit: 5482581c7c96a8fe60bb29c181e86cdc9889b068 ("[PATCH v4 4/5] fsnotify: allow sleepable child flag update")
url: https://github.com/intel-lab-lkp/linux/commits/Stephen-Brennan/fsnotify-clear-PARENT_WATCHED-flags-lazily/20221112-070656
base: https://git.kernel.org/cgit/linux/kernel/git/jack/linux-fs.git fsnotify
patch subject: [PATCH v4 4/5] fsnotify: allow sleepable child flag update
in testcase: boot
on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G
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 <oliver.sang@...el.com>
| Link: https://lore.kernel.org/oe-lkp/202211151309.1fdf8fd0-oliver.sang@intel.com
[ 16.419535][ T369] WARNING: possible recursive locking detected
[ 16.420080][ T369] 6.0.0-rc4-00068-g5482581c7c96 #1 Not tainted
[ 16.420595][ T369] --------------------------------------------
[ 16.421105][ T369] dnsmasq/369 is trying to acquire lock:
[ 16.421578][ T369] bfaa3858 (&dentry->d_lock){+.+.}-{2:2}, at: lockref_get (??:?)
[ 16.422251][ T369]
[ 16.422251][ T369] but task is already holding lock:
[ 16.422868][ T369] bf804d60 (&dentry->d_lock){+.+.}-{2:2}, at: fsnotify_update_children_dentry_flags (??:?)
[ 16.423733][ T369]
[ 16.423733][ T369] other info that might help us debug this:
[ 16.424438][ T369] Possible unsafe locking scenario:
[ 16.424438][ T369]
[ 16.425082][ T369] CPU0
[ 16.425376][ T369] ----
[ 16.425660][ T369] lock(&dentry->d_lock);
[ 16.426052][ T369] lock(&dentry->d_lock);
[ 16.426439][ T369]
[ 16.426439][ T369] *** DEADLOCK ***
[ 16.426439][ T369]
[ 16.427109][ T369] May be due to missing lock nesting notation
[ 16.427109][ T369]
[ 16.427808][ T369] 2 locks held by dnsmasq/369:
[ 16.428219][ T369] #0: 409474b0 (&group->mark_mutex){+.+.}-{3:3}, at: inotify_update_watch (inotify_user.c:?)
[ 16.429047][ T369] #1: bf804d60 (&dentry->d_lock){+.+.}-{2:2}, at: fsnotify_update_children_dentry_flags (??:?)
[ 16.430016][ T369]
[ 16.430016][ T369] stack backtrace:
[ 16.430538][ T369] CPU: 1 PID: 369 Comm: dnsmasq Not tainted 6.0.0-rc4-00068-g5482581c7c96 #1
[ 16.431276][ T369] Call Trace:
[ 16.431560][ T369] ? dump_stack_lvl (??:?)
[ 16.431990][ T369] ? dump_stack (??:?)
[ 16.432347][ T369] ? validate_chain.cold (lockdep.c:?)
[ 16.432791][ T369] ? __lock_acquire (lockdep.c:?)
[ 16.433233][ T369] ? lock_acquire (??:?)
[ 16.433651][ T369] ? lockref_get (??:?)
[ 16.434034][ T369] ? __lock_release (lockdep.c:?)
[ 16.434454][ T369] ? fsnotify_update_children_dentry_flags (??:?)
[ 16.435069][ T369] ? _raw_spin_lock (??:?)
[ 16.435465][ T369] ? lockref_get (??:?)
[ 16.435832][ T369] ? lockref_get (??:?)
[ 16.436190][ T369] ? fsnotify_update_children_dentry_flags (??:?)
[ 16.436753][ T369] ? fsnotify_recalc_mask (??:?)
[ 16.437229][ T369] ? fsnotify_add_mark_locked (??:?)
[ 16.437716][ T369] ? inotify_new_watch (inotify_user.c:?)
[ 16.438166][ T369] ? inotify_update_watch (inotify_user.c:?)
[ 16.438627][ T369] ? __ia32_sys_inotify_add_watch (??:?)
[ 16.439183][ T369] ? do_int80_syscall_32 (??:?)
[ 16.439640][ T369] ? entry_INT80_32 (entry_32.o:?)
LKP: ttyS0: 641: Kernel tests: Boot OK!
LKP: ttyS0: 641: HOSTNAME vm-snb, MAC 52:54:00:12:34:56, kernel 6.0.0-rc4-00068-g5482581c7c96 1
LKP: ttyS0: 641: /lkp/lkp/src/bin/run-lkp /lkp/jobs/scheduled/vm-meta-42/boot-1-openwrt-i386-generic-20190428.cgz-5482581c7c96a8fe60bb29c181e86cdc9889b068-20221115-34610-11px8cv-40.yaml
[ 18.633802][ T655] mkdir: can't create directory '/sys/kernel/debug': Operation not permitted
[ 18.633802][ T655] mount: mounting debug on /sys/kernel/debug failed: No such file or directory
[ 21.139501][ T856] process 856 (wait) attempted a POSIX timer syscall while CONFIG_POSIX_TIMERS is not set
[ 32.651080][ T957] rsync (957) used greatest stack depth: 6208 bytes left
LKP: ttyS0: 641: LKP: rebooting forcely
[ 42.464678][ T641] sysrq: Emergency Sync
[ 42.465117][ T641] sysrq: Resetting
Kboot worker: lkp-worker53
Elapsed time: 60
kvm=(
qemu-system-x86_64
-enable-kvm
-cpu SandyBridge
-kernel $kernel
-initrd initrd-vm-meta-42.cgz
-m 16384
-smp 2
-device e1000,netdev=net0
-netdev user,id=net0,hostfwd=tcp::32032-:22
-boot order=nc
-no-reboot
-device i6300esb
-watchdog-action debug
-rtc base=localtime
-serial stdio
-display none
-monitor null
)
append=(
ip=::::vm-meta-42::dhcp
root=/dev/ram0
RESULT_ROOT=/result/boot/1/vm-snb/openwrt-i386-generic-20190428.cgz/i386-randconfig-a011-20210930/gcc-11/5482581c7c96a8fe60bb29c181e86cdc9889b068/73
BOOT_IMAGE=/pkg/linux/i386-randconfig-a011-20210930/gcc-11/5482581c7c96a8fe60bb29c181e86cdc9889b068/vmlinuz-6.0.0-rc4-00068-g5482581c7c96
branch=linux-review/Stephen-Brennan/fsnotify-clear-PARENT_WATCHED-flags-lazily/20221112-070656
job=/job-script
user=lkp
ARCH=i386
kconfig=i386-randconfig-a011-20210930
commit=5482581c7c96a8fe60bb29c181e86cdc9889b068
vmalloc=256M
initramfs_async=0
page_owner=on
initcall_debug
max_uptime=600
result_service=tmpfs
selinux=0
debug
apic=debug
To reproduce:
# build kernel
cd linux
cp config-6.0.0-rc4-00068-g5482581c7c96 .config
make HOSTCC=gcc-11 CC=gcc-11 ARCH=i386 olddefconfig prepare modules_prepare bzImage modules
make HOSTCC=gcc-11 CC=gcc-11 ARCH=i386 INSTALL_MOD_PATH=<mod-install-dir> modules_install
cd <mod-install-dir>
find lib/ | cpio -o -H newc --quiet | gzip > modules.cgz
git clone https://github.com/intel/lkp-tests.git
cd lkp-tests
bin/lkp qemu -k <bzImage> -m modules.cgz job-script # job-script is attached in this email
# if come across any failure that blocks the test,
# please remove ~/.lkp and /lkp dir to run from a clean state.
--
0-DAY CI Kernel Test Service
https://01.org/lkp
View attachment "config-6.0.0-rc4-00068-g5482581c7c96" of type "text/plain" (151584 bytes)
View attachment "job-script" of type "text/plain" (4829 bytes)
Download attachment "dmesg.xz" of type "application/x-xz" (48860 bytes)
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