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Date: Thu, 5 May 2016 09:32:45 +0800
From: kernel test robot <xiaolong.ye@...el.com>
To: Ebru Akagunduz <ebru.akagunduz@...il.com>
Cc: Stephen Rothwell <sfr@...b.auug.org.au>,
Rik van Riel <riel@...hat.com>,
Hugh Dickins <hughd@...gle.com>,
"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: [lkp] [mm, thp] 409ca714ac: INFO: possible circular locking
dependency detected
FYI, we noticed the following commit:
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
commit 409ca714ac58768342cd39ca79c16f51e1825b3e ("mm, thp: avoid unnecessary swapin in khugepaged")
on test machine: vm-kbuild-1G: 2 threads qemu-system-x86_64 -enable-kvm -cpu Haswell,+smep,+smap with 1G memory
caused below changes:
[ 21.116124] ======================================================
[ 21.116124] ======================================================
[ 21.116124] [ INFO: possible circular locking dependency detected ]
[ 21.116124] [ INFO: possible circular locking dependency detected ]
[ 21.116127] 4.6.0-rc5-00302-g409ca71 #1 Not tainted
[ 21.116127] 4.6.0-rc5-00302-g409ca71 #1 Not tainted
[ 21.116127] -------------------------------------------------------
[ 21.116127] -------------------------------------------------------
[ 21.116128] udevadm/221 is trying to acquire lock:
[ 21.116128] udevadm/221 is trying to acquire lock:
[ 21.116138] (&mm->mmap_sem){++++++}, at: [<ffffffff81262543>] __might_fault+0x83/0x150
[ 21.116138] (&mm->mmap_sem){++++++}, at: [<ffffffff81262543>] __might_fault+0x83/0x150
[ 21.116138]
[ 21.116138] but task is already holding lock:
[ 21.116138]
[ 21.116138] but task is already holding lock:
[ 21.116144] (s_active#12){++++.+}, at: [<ffffffff813315ee>] kernfs_fop_write+0x8e/0x250
[ 21.116144] (s_active#12){++++.+}, at: [<ffffffff813315ee>] kernfs_fop_write+0x8e/0x250
[ 21.116144]
[ 21.116144] which lock already depends on the new lock.
[ 21.116144]
[ 21.116144]
[ 21.116144] which lock already depends on the new lock.
[ 21.116144]
[ 21.116145]
[ 21.116145] the existing dependency chain (in reverse order) is:
[ 21.116145]
[ 21.116145] the existing dependency chain (in reverse order) is:
[ 21.116148]
[ 21.116148] -> #2 (s_active#12){++++.+}:
[ 21.116148]
[ 21.116148] -> #2 (s_active#12){++++.+}:
[ 21.116152] [<ffffffff8117da2c>] lock_acquire+0xac/0x180
[ 21.116152] [<ffffffff8117da2c>] lock_acquire+0xac/0x180
[ 21.116155] [<ffffffff8132f50a>] __kernfs_remove+0x2da/0x410
[ 21.116155] [<ffffffff8132f50a>] __kernfs_remove+0x2da/0x410
[ 21.116158] [<ffffffff81330630>] kernfs_remove_by_name_ns+0x40/0x90
[ 21.116158] [<ffffffff81330630>] kernfs_remove_by_name_ns+0x40/0x90
[ 21.116160] [<ffffffff813339fb>] sysfs_remove_file_ns+0x2b/0x70
[ 21.116160] [<ffffffff813339fb>] sysfs_remove_file_ns+0x2b/0x70
[ 21.116164] [<ffffffff81ba8a16>] device_del+0x166/0x320
[ 21.116164] [<ffffffff81ba8a16>] device_del+0x166/0x320
[ 21.116166] [<ffffffff81ba943c>] device_destroy+0x3c/0x50
[ 21.116166] [<ffffffff81ba943c>] device_destroy+0x3c/0x50
[ 21.116170] [<ffffffff8105aa61>] cpuid_class_cpu_callback+0x51/0x70
[ 21.116170] [<ffffffff8105aa61>] cpuid_class_cpu_callback+0x51/0x70
[ 21.116173] [<ffffffff81131ce9>] notifier_call_chain+0x59/0x190
[ 21.116173] [<ffffffff81131ce9>] notifier_call_chain+0x59/0x190
[ 21.116177] [<ffffffff81132749>] __raw_notifier_call_chain+0x9/0x10
[ 21.116177] [<ffffffff81132749>] __raw_notifier_call_chain+0x9/0x10
[ 21.116180] [<ffffffff810fe6b0>] __cpu_notify+0x40/0x90
[ 21.116180] [<ffffffff810fe6b0>] __cpu_notify+0x40/0x90
[ 21.116182] [<ffffffff810fe890>] cpu_notify_nofail+0x10/0x30
[ 21.116182] [<ffffffff810fe890>] cpu_notify_nofail+0x10/0x30
[ 21.116185] [<ffffffff810fe8d7>] notify_dead+0x27/0x1e0
[ 21.116185] [<ffffffff810fe8d7>] notify_dead+0x27/0x1e0
[ 21.116187] [<ffffffff810fe273>] cpuhp_down_callbacks+0x93/0x190
[ 21.116187] [<ffffffff810fe273>] cpuhp_down_callbacks+0x93/0x190
[ 21.116192] [<ffffffff82096062>] _cpu_down+0xc2/0x1e0
[ 21.116192] [<ffffffff82096062>] _cpu_down+0xc2/0x1e0
[ 21.116194] [<ffffffff810ff727>] do_cpu_down+0x37/0x50
[ 21.116194] [<ffffffff810ff727>] do_cpu_down+0x37/0x50
[ 21.116197] [<ffffffff8110003b>] cpu_down+0xb/0x10
[ 21.116197] [<ffffffff8110003b>] cpu_down+0xb/0x10
[ 21.116201] [<ffffffff81038e4d>] _debug_hotplug_cpu+0x7d/0xd0
[ 21.116201] [<ffffffff81038e4d>] _debug_hotplug_cpu+0x7d/0xd0
[ 21.116205] [<ffffffff8435d6bb>] debug_hotplug_cpu+0xd/0x11
[ 21.116205] [<ffffffff8435d6bb>] debug_hotplug_cpu+0xd/0x11
[ 21.116208] [<ffffffff84352426>] do_one_initcall+0x138/0x1cf
[ 21.116208] [<ffffffff84352426>] do_one_initcall+0x138/0x1cf
[ 21.116211] [<ffffffff8435270a>] kernel_init_freeable+0x24d/0x2de
[ 21.116211] [<ffffffff8435270a>] kernel_init_freeable+0x24d/0x2de
[ 21.116214] [<ffffffff8209533a>] kernel_init+0xa/0x120
[ 21.116214] [<ffffffff8209533a>] kernel_init+0xa/0x120
[ 21.116217] [<ffffffff820a7972>] ret_from_fork+0x22/0x50
[ 21.116217] [<ffffffff820a7972>] ret_from_fork+0x22/0x50
[ 21.116221]
[ 21.116221] -> #1 (cpu_hotplug.lock#2){+.+.+.}:
[ 21.116221]
[ 21.116221] -> #1 (cpu_hotplug.lock#2){+.+.+.}:
[ 21.116223] [<ffffffff8117da2c>] lock_acquire+0xac/0x180
[ 21.116223] [<ffffffff8117da2c>] lock_acquire+0xac/0x180
[ 21.116226] [<ffffffff820a20d1>] mutex_lock_nested+0x71/0x4c0
[ 21.116226] [<ffffffff820a20d1>] mutex_lock_nested+0x71/0x4c0
[ 21.116228] [<ffffffff810ff526>] get_online_cpus+0x66/0x80
[ 21.116228] [<ffffffff810ff526>] get_online_cpus+0x66/0x80
[ 21.116232] [<ffffffff81246fb3>] sum_vm_event+0x23/0x1b0
[ 21.116232] [<ffffffff81246fb3>] sum_vm_event+0x23/0x1b0
[ 21.116236] [<ffffffff81293768>] collapse_huge_page+0x118/0x10b0
[ 21.116236] [<ffffffff81293768>] collapse_huge_page+0x118/0x10b0
[ 21.116238] [<ffffffff81294c5d>] khugepaged+0x55d/0xe80
[ 21.116238] [<ffffffff81294c5d>] khugepaged+0x55d/0xe80
[ 21.116240] [<ffffffff81130304>] kthread+0x134/0x1a0
[ 21.116240] [<ffffffff81130304>] kthread+0x134/0x1a0
[ 21.116242] [<ffffffff820a7972>] ret_from_fork+0x22/0x50
[ 21.116242] [<ffffffff820a7972>] ret_from_fork+0x22/0x50
[ 21.116244]
[ 21.116244] -> #0 (&mm->mmap_sem){++++++}:
[ 21.116244]
[ 21.116244] -> #0 (&mm->mmap_sem){++++++}:
[ 21.116246] [<ffffffff8117bf61>] __lock_acquire+0x2861/0x31f0
[ 21.116246] [<ffffffff8117bf61>] __lock_acquire+0x2861/0x31f0
[ 21.116248] [<ffffffff8117da2c>] lock_acquire+0xac/0x180
[ 21.116248] [<ffffffff8117da2c>] lock_acquire+0xac/0x180
[ 21.116251] [<ffffffff8126257e>] __might_fault+0xbe/0x150
[ 21.116251] [<ffffffff8126257e>] __might_fault+0xbe/0x150
[ 21.116253] [<ffffffff8133160f>] kernfs_fop_write+0xaf/0x250
[ 21.116253] [<ffffffff8133160f>] kernfs_fop_write+0xaf/0x250
[ 21.116256] [<ffffffff812a8933>] __vfs_write+0x43/0x1a0
[ 21.116256] [<ffffffff812a8933>] __vfs_write+0x43/0x1a0
[ 21.116258] [<ffffffff812a8d3a>] vfs_write+0xda/0x240
[ 21.116258] [<ffffffff812a8d3a>] vfs_write+0xda/0x240
[ 21.116260] [<ffffffff812a8f84>] SyS_write+0x44/0xa0
[ 21.116260] [<ffffffff812a8f84>] SyS_write+0x44/0xa0
[ 21.116263] [<ffffffff820a773c>] entry_SYSCALL_64_fastpath+0x1f/0xbd
[ 21.116263] [<ffffffff820a773c>] entry_SYSCALL_64_fastpath+0x1f/0xbd
[ 21.116264]
[ 21.116264] other info that might help us debug this:
[ 21.116264]
[ 21.116264]
[ 21.116264] other info that might help us debug this:
[ 21.116264]
[ 21.116268] Chain exists of:
[ 21.116268] &mm->mmap_sem --> cpu_hotplug.lock#2 --> s_active#12
[ 21.116268]
[ 21.116268] Chain exists of:
[ 21.116268] &mm->mmap_sem --> cpu_hotplug.lock#2 --> s_active#12
[ 21.116268]
[ 21.116268] Possible unsafe locking scenario:
[ 21.116268]
[ 21.116268] Possible unsafe locking scenario:
[ 21.116268]
[ 21.116269] CPU0 CPU1
[ 21.116269] CPU0 CPU1
[ 21.116269] ---- ----
[ 21.116269] ---- ----
[ 21.116270] lock(s_active#12);
[ 21.116270] lock(s_active#12);
[ 21.116271] lock(cpu_hotplug.lock#2);
[ 21.116271] lock(cpu_hotplug.lock#2);
[ 21.116272] lock(s_active#12);
[ 21.116272] lock(s_active#12);
[ 21.116273] lock(&mm->mmap_sem);
[ 21.116273] lock(&mm->mmap_sem);
[ 21.116274]
[ 21.116274] *** DEADLOCK ***
[ 21.116274]
[ 21.116274]
[ 21.116274] *** DEADLOCK ***
[ 21.116274]
[ 21.116274] 3 locks held by udevadm/221:
[ 21.116274] 3 locks held by udevadm/221:
[ 21.116278] #0: (sb_writers#3){.+.+.+}, at: [<ffffffff812ad64d>] __sb_start_write+0x6d/0x120
[ 21.116278] #0: (sb_writers#3){.+.+.+}, at: [<ffffffff812ad64d>] __sb_start_write+0x6d/0x120
[ 21.116280] #1: (&of->mutex){+.+.+.}, at: [<ffffffff813315e6>] kernfs_fop_write+0x86/0x250
[ 21.116280] #1: (&of->mutex){+.+.+.}, at: [<ffffffff813315e6>] kernfs_fop_write+0x86/0x250
[ 21.116282] #2: (s_active#12){++++.+}, at: [<ffffffff813315ee>] kernfs_fop_write+0x8e/0x250
[ 21.116282] #2: (s_active#12){++++.+}, at: [<ffffffff813315ee>] kernfs_fop_write+0x8e/0x250
[ 21.116283]
[ 21.116283] stack backtrace:
[ 21.116283]
[ 21.116283] stack backtrace:
[ 21.116284] CPU: 1 PID: 221 Comm: udevadm Not tainted 4.6.0-rc5-00302-g409ca71 #1
[ 21.116284] CPU: 1 PID: 221 Comm: udevadm Not tainted 4.6.0-rc5-00302-g409ca71 #1
[ 21.116287] ffff88003f698000 ffff88003f077bf0 ffffffff81444ef3 0000000000000011
[ 21.116287] ffff88003f698000 ffff88003f077bf0 ffffffff81444ef3 0000000000000011
[ 21.116288] ffffffff84bdd8f0 ffffffff84bf2630 ffff88003f077c40 ffffffff81173e91
[ 21.116288] ffffffff84bdd8f0 ffffffff84bf2630 ffff88003f077c40 ffffffff81173e91
[ 21.116290] 0000000000000000 ffffffff84fbdbc0 00ff88003f077c40 ffff88003f698bb8
[ 21.116290] 0000000000000000 ffffffff84fbdbc0 00ff88003f077c40 ffff88003f698bb8
[ 21.116290] Call Trace:
[ 21.116290] Call Trace:
[ 21.116293] [<ffffffff81444ef3>] dump_stack+0x86/0xd3
[ 21.116293] [<ffffffff81444ef3>] dump_stack+0x86/0xd3
[ 21.116294] [<ffffffff81173e91>] print_circular_bug+0x221/0x360
[ 21.116294] [<ffffffff81173e91>] print_circular_bug+0x221/0x360
[ 21.116296] [<ffffffff8117bf61>] __lock_acquire+0x2861/0x31f0
[ 21.116296] [<ffffffff8117bf61>] __lock_acquire+0x2861/0x31f0
[ 21.116297] [<ffffffff8117da2c>] lock_acquire+0xac/0x180
[ 21.116297] [<ffffffff8117da2c>] lock_acquire+0xac/0x180
[ 21.116299] [<ffffffff81262543>] ? __might_fault+0x83/0x150
[ 21.116299] [<ffffffff81262543>] ? __might_fault+0x83/0x150
[ 21.116300] [<ffffffff8126257e>] __might_fault+0xbe/0x150
[ 21.116300] [<ffffffff8126257e>] __might_fault+0xbe/0x150
[ 21.116302] [<ffffffff81262543>] ? __might_fault+0x83/0x150
[ 21.116302] [<ffffffff81262543>] ? __might_fault+0x83/0x150
[ 21.116303] [<ffffffff8133160f>] kernfs_fop_write+0xaf/0x250
[ 21.116303] [<ffffffff8133160f>] kernfs_fop_write+0xaf/0x250
[ 21.116304] [<ffffffff812a8933>] __vfs_write+0x43/0x1a0
[ 21.116304] [<ffffffff812a8933>] __vfs_write+0x43/0x1a0
[ 21.116306] [<ffffffff8116fe0d>] ? update_fast_ctr+0x1d/0x80
[ 21.116306] [<ffffffff8116fe0d>] ? update_fast_ctr+0x1d/0x80
[ 21.116308] [<ffffffff8116ffe7>] ? percpu_down_read+0x57/0xa0
[ 21.116308] [<ffffffff8116ffe7>] ? percpu_down_read+0x57/0xa0
[ 21.116310] [<ffffffff812ad64d>] ? __sb_start_write+0x6d/0x120
[ 21.116310] [<ffffffff812ad64d>] ? __sb_start_write+0x6d/0x120
[ 21.116311] [<ffffffff812ad64d>] ? __sb_start_write+0x6d/0x120
[ 21.116311] [<ffffffff812ad64d>] ? __sb_start_write+0x6d/0x120
[ 21.116312] [<ffffffff812a8d3a>] vfs_write+0xda/0x240
[ 21.116312] [<ffffffff812a8d3a>] vfs_write+0xda/0x240
[ 21.116314] [<ffffffff812a8f84>] SyS_write+0x44/0xa0
[ 21.116314] [<ffffffff812a8f84>] SyS_write+0x44/0xa0
[ 21.116315] [<ffffffff820a773c>] entry_SYSCALL_64_fastpath+0x1f/0xbd
[ 21.116315] [<ffffffff820a773c>] entry_SYSCALL_64_fastpath+0x1f/0xbd
FYI, raw QEMU command line is:
qemu-system-x86_64 -enable-kvm -cpu Haswell,+smep,+smap -kernel /pkg/linux/x86_64-randconfig-s5-04281751/gcc-5/409ca714ac58768342cd39ca79c16f51e1825b3e/vmlinuz-4.6.0-rc5-00302-g409ca71 -append 'root=/dev/ram0 user=lkp job=/lkp/scheduled/vm-kbuild-1G-1/bisect_boot-1-debian-x86_64-2015-02-07.cgz-x86_64-randconfig-s5-04281751-409ca714ac58768342cd39ca79c16f51e1825b3e-20160429-79826-1u5edix-0.yaml ARCH=x86_64 kconfig=x86_64-randconfig-s5-04281751 branch=linux-devel/devel-catchup-201604281803 commit=409ca714ac58768342cd39ca79c16f51e1825b3e BOOT_IMAGE=/pkg/linux/x86_64-randconfig-s5-04281751/gcc-5/409ca714ac58768342cd39ca79c16f51e1825b3e/vmlinuz-4.6.0-rc5-00302-g409ca71 max_uptime=600 RESULT_ROOT=/result/boot/1/vm-kbuild-1G/debian-x86_64-2015-02-07.cgz/x86_64-randconfig-s5-04281751/gcc-5/409ca714ac58768342cd39ca79c16f51e1825b3e/0 LKP_SERVER=inn earlyprintk=ttyS0,115200 systemd.log_level=err debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 panic=-1 softlockup_panic=1 nmi_watchdog=panic oops=panic load_ramdisk=2 prompt_ramdisk=0 console=ttyS0,115200 console=tty0 vga=normal rw ip=::::vm-kbuild-1G-1::dhcp' -initrd /fs/sdb1/initrd-vm-kbuild-1G-1 -m 1024 -smp 2 -device e1000,netdev=net0 -netdev user,id=net0,hostfwd=tcp::23000-:22 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -device virtio-scsi-pci,id=scsi0 -drive file=/fs/sdb1/disk0-vm-kbuild-1G-1,if=none,id=hd0,media=disk,aio=native,cache=none -device scsi-hd,bus=scsi0.0,drive=hd0,scsi-id=1,lun=0 -drive file=/fs/sdb1/disk1-vm-kbuild-1G-1,if=none,id=hd1,media=disk,aio=native,cache=none -device scsi-hd,bus=scsi0.0,drive=hd1,scsi-id=1,lun=1 -drive file=/fs/sdb1/disk2-vm-kbuild-1G-1,if=none,id=hd2,media=disk,aio=native,cache=none -device scsi-hd,bus=scsi0.0,drive=hd2,scsi-id=1,lun=2 -drive file=/fs/sdb1/disk3-vm-kbuild-1G-1,if=none,id=hd3,media=disk,aio=native,cache=none -device scsi-hd,bus=scsi0.0,drive=hd3,scsi-id=1,lun=3 -drive file=/fs/sdb1/disk4-vm-kbuild-1G-1,if=none,id=hd4,media=disk,aio=native,cache=none -device scsi-hd,bus=scsi0.0,drive=hd4,scsi-id=1,lun=4 -pidfile /dev/shm/kboot/pid-vm-kbuild-1G-1 -serial file:/dev/shm/kboot/serial-vm-kbuild-1G-1 -daemonize -display none -monitor null
Thanks,
Xiaolong
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