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Message-ID: <20131021185409.GA2408@swordfish>
Date: Mon, 21 Oct 2013 21:54:09 +0300
From: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To: "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc: Toshi Kani <toshi.kani@...com>,
Thomas Gleixner <tglx@...utronix.de>,
Frederic Weisbecker <fweisbec@...il.com>,
Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org
Subject: [LOCKDEP] cpu_add_remove_lock/console_lock possible circular locking
dependency detected
Hello,
during systemctl suspend:
[ 3261.011172] ======================================================
[ 3261.011173] [ INFO: possible circular locking dependency detected ]
[ 3261.011176] 3.12.0-rc6-dbg-00003-g0df651a-dirty #1981 Not tainted
[ 3261.011177] -------------------------------------------------------
[ 3261.011179] systemd-sleep/9549 is trying to acquire lock:
[ 3261.011194] (cpu_add_remove_lock){+.+.+.}, at: [<ffffffff8104ddd4>] disable_nonboot_cpus+0x24/0x130
[ 3261.011195]
but task is already holding lock:
[ 3261.011202] (console_lock){+.+.+.}, at: [<ffffffff810a5006>] suspend_console+0x26/0x40
[ 3261.011203]
which lock already depends on the new lock.
[ 3261.011204]
the existing dependency chain (in reverse order) is:
[ 3261.011208]
-> #2 (console_lock){+.+.+.}:
[ 3261.011213] [<ffffffff810bd264>] lock_acquire+0xa4/0x200
[ 3261.011216] [<ffffffff810a3857>] console_lock+0x77/0x80
[ 3261.011219] [<ffffffff810a5681>] console_cpu_notify+0x31/0x40
[ 3261.011225] [<ffffffff8107ddfd>] notifier_call_chain+0x5d/0x110
[ 3261.011228] [<ffffffff8107debe>] __raw_notifier_call_chain+0xe/0x10
[ 3261.011231] [<ffffffff8104d823>] cpu_notify+0x23/0x50
[ 3261.011235] [<ffffffff8104d85e>] cpu_notify_nofail+0xe/0x20
[ 3261.011241] [<ffffffff8161cd5d>] _cpu_down+0x1ad/0x330
[ 3261.011244] [<ffffffff8161cf16>] cpu_down+0x36/0x50
[ 3261.011252] [<ffffffff814ce38d>] cpu_subsys_offline+0x1d/0x30
[ 3261.011255] [<ffffffff814c97c5>] device_offline+0x95/0xc0
[ 3261.011258] [<ffffffff814c98c0>] online_store+0x40/0x90
[ 3261.011264] [<ffffffff814c6e48>] dev_attr_store+0x18/0x30
[ 3261.011270] [<ffffffff811f0bcb>] sysfs_write_file+0xdb/0x150
[ 3261.011274] [<ffffffff81173d6d>] vfs_write+0xbd/0x1e0
[ 3261.011277] [<ffffffff811747cc>] SyS_write+0x4c/0xa0
[ 3261.011284] [<ffffffff81630156>] tracesys+0xd4/0xd9
[ 3261.011287]
-> #1 (cpu_hotplug.lock){+.+.+.}:
[ 3261.011290] [<ffffffff810bd264>] lock_acquire+0xa4/0x200
[ 3261.011293] [<ffffffff81628887>] mutex_lock_nested+0x67/0x570
[ 3261.011297] [<ffffffff8104d8db>] cpu_hotplug_begin+0x2b/0x60
[ 3261.011300] [<ffffffff8104d93e>] _cpu_up+0x2e/0x180
[ 3261.011303] [<ffffffff8104dae9>] cpu_up+0x59/0x80
[ 3261.011309] [<ffffffff81cf6e97>] smp_init+0x66/0x97
[ 3261.011314] [<ffffffff81cdbf1e>] kernel_init_freeable+0x84/0x196
[ 3261.011317] [<ffffffff8161c0ee>] kernel_init+0xe/0x180
[ 3261.011321] [<ffffffff8162fefc>] ret_from_fork+0x7c/0xb0
[ 3261.011325]
-> #0 (cpu_add_remove_lock){+.+.+.}:
[ 3261.011328] [<ffffffff810bc370>] __lock_acquire+0x19d0/0x1f40
[ 3261.011331] [<ffffffff810bd264>] lock_acquire+0xa4/0x200
[ 3261.011334] [<ffffffff81628887>] mutex_lock_nested+0x67/0x570
[ 3261.011337] [<ffffffff8104ddd4>] disable_nonboot_cpus+0x24/0x130
[ 3261.011342] [<ffffffff8109b575>] suspend_devices_and_enter+0x1d5/0x660
[ 3261.011346] [<ffffffff8109bbd2>] pm_suspend+0x1d2/0x240
[ 3261.011349] [<ffffffff8109a5b9>] state_store+0x79/0xf0
[ 3261.011356] [<ffffffff8131c44f>] kobj_attr_store+0xf/0x20
[ 3261.011360] [<ffffffff811f0bcb>] sysfs_write_file+0xdb/0x150
[ 3261.011362] [<ffffffff81173d6d>] vfs_write+0xbd/0x1e0
[ 3261.011365] [<ffffffff811747cc>] SyS_write+0x4c/0xa0
[ 3261.011368] [<ffffffff81630156>] tracesys+0xd4/0xd9
[ 3261.011369]
other info that might help us debug this:
[ 3261.011374] Chain exists of:
cpu_add_remove_lock --> cpu_hotplug.lock --> console_lock
[ 3261.011375] Possible unsafe locking scenario:
[ 3261.011376] CPU0 CPU1
[ 3261.011377] ---- ----
[ 3261.011379] lock(console_lock);
[ 3261.011381] lock(cpu_hotplug.lock);
[ 3261.011384] lock(console_lock);
[ 3261.011386] lock(cpu_add_remove_lock);
[ 3261.011387]
*** DEADLOCK ***
[ 3261.011388] 6 locks held by systemd-sleep/9549:
[ 3261.011395] #0: (sb_writers#6){.+.+.+}, at: [<ffffffff81173e6b>] vfs_write+0x1bb/0x1e0
[ 3261.011402] #1: (&buffer->mutex){+.+.+.}, at: [<ffffffff811f0b2c>] sysfs_write_file+0x3c/0x150
[ 3261.011409] #2: (s_active#111){.+.+.+}, at: [<ffffffff811f0bb3>] sysfs_write_file+0xc3/0x150
[ 3261.011415] #3: (pm_mutex){+.+.+.}, at: [<ffffffff8109ba32>] pm_suspend+0x32/0x240
[ 3261.011423] #4: (acpi_scan_lock){+.+.+.}, at: [<ffffffff8136bd19>] acpi_scan_lock_acquire+0x17/0x19
[ 3261.011429] #5: (console_lock){+.+.+.}, at: [<ffffffff810a5006>] suspend_console+0x26/0x40
[ 3261.011430]
stack backtrace:
[ 3261.011433] CPU: 0 PID: 9549 Comm: systemd-sleep Not tainted 3.12.0-rc6-dbg-00003-g0df651a-dirty #1981
[ 3261.011435] Hardware name: Acer Aspire 5741G /Aspire 5741G , BIOS V1.20 02/08/2011
[ 3261.011440] ffffffff821f3c60 ffff880148cd7bc8 ffffffff816250a0 ffffffff821f29d0
[ 3261.011444] ffff880148cd7c08 ffffffff81621c06 ffff880093c18ff0 ffff880093c19748
[ 3261.011448] 42606a03548d23a1 ffff880093c19720 ffff880093c18ff0 ffff880093c19748
[ 3261.011450] Call Trace:
[ 3261.011454] [<ffffffff816250a0>] dump_stack+0x4e/0x82
[ 3261.011459] [<ffffffff81621c06>] print_circular_bug+0x2b4/0x31d
[ 3261.011462] [<ffffffff810bc370>] __lock_acquire+0x19d0/0x1f40
[ 3261.011467] [<ffffffff81054e8c>] ? walk_system_ram_range+0x5c/0x140
[ 3261.011471] [<ffffffff810bd264>] lock_acquire+0xa4/0x200
[ 3261.011475] [<ffffffff8104ddd4>] ? disable_nonboot_cpus+0x24/0x130
[ 3261.011478] [<ffffffff8104ddd4>] ? disable_nonboot_cpus+0x24/0x130
[ 3261.011481] [<ffffffff81628887>] mutex_lock_nested+0x67/0x570
[ 3261.011485] [<ffffffff8104ddd4>] ? disable_nonboot_cpus+0x24/0x130
[ 3261.011488] [<ffffffff8162b67e>] ? mutex_unlock+0xe/0x10
[ 3261.011493] [<ffffffff81367dff>] ? acpi_os_get_iomem+0x4c/0x54
[ 3261.011497] [<ffffffff8104ddd4>] disable_nonboot_cpus+0x24/0x130
[ 3261.011501] [<ffffffff8109b575>] suspend_devices_and_enter+0x1d5/0x660
[ 3261.011505] [<ffffffff81621463>] ? printk+0x54/0x56
[ 3261.011508] [<ffffffff8109bbd2>] pm_suspend+0x1d2/0x240
[ 3261.011512] [<ffffffff8109a5b9>] state_store+0x79/0xf0
[ 3261.011516] [<ffffffff8131c44f>] kobj_attr_store+0xf/0x20
[ 3261.011520] [<ffffffff811f0bcb>] sysfs_write_file+0xdb/0x150
[ 3261.011523] [<ffffffff81173d6d>] vfs_write+0xbd/0x1e0
[ 3261.011528] [<ffffffff81193130>] ? fget_light+0x320/0x4b0
[ 3261.011531] [<ffffffff811747cc>] SyS_write+0x4c/0xa0
[ 3261.011535] [<ffffffff81630156>] tracesys+0xd4/0xd9
[ 3261.011537] Disabling non-boot CPUs ...
[ 3261.013327] smpboot: CPU 1 is now offline
[ 3261.116887] smpboot: CPU 2 is now offline
[ 3261.220932] smpboot: CPU 3 is now offline
-ss
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