All of lore.kernel.org
 help / color / mirror / Atom feed
From: Sasha Levin <sasha.levin@oracle.com>
To: Greg KH <greg@kroah.com>, Tejun Heo <tj@kernel.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	Andrea Arcangeli <aarcange@redhat.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Rik van Riel <riel@redhat.com>, Minchan Kim <minchan@kernel.org>
Subject: mm: kswapd/kernfs possible deadlock
Date: Sun, 23 Mar 2014 09:51:32 -0400	[thread overview]
Message-ID: <532EE6E4.8070903@oracle.com> (raw)

Hi all,

While fuzzing with trinity inside KVM tools guest running latest -next kernel
I've stumbled on the following:

[ 1336.998827] ======================================================
[ 1337.000394] [ INFO: possible circular locking dependency detected ]
[ 1337.001425] 3.14.0-rc7-next-20140321-sasha-00018-g0516fe6-dirty #265 Tainted: G        W
[ 1337.001964] -------------------------------------------------------
[ 1337.001964] trinity-c24/33631 is trying to acquire lock:
[ 1337.001964]  (&pgdat->kswapd_wait){..-.-.}, at: __wake_up (kernel/sched/wait.c:94)
[ 1337.001964]
[ 1337.001964] but task is already holding lock:
[ 1337.001964]  (&(&n->list_lock)->rlock){-.-.-.}, at: list_locations (mm/slub.c:4159)
[ 1337.001964]
[ 1337.001964] which lock already depends on the new lock.
[ 1337.001964]
[ 1337.001964]
[ 1337.001964] the existing dependency chain (in reverse order) is:
[ 1337.001964]
-> #3 (&(&n->list_lock)->rlock){-.-.-.}:
[ 1337.001964]        lock_acquire (arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3602)
[ 1337.001964]        _raw_spin_lock (include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:151)
[ 1337.001964]        get_partial_node.isra.35 (mm/slub.c:1623)
[ 1337.001964]        __slab_alloc (mm/slub.c:1725 mm/slub.c:2193 mm/slub.c:2359)
[ 1337.001964]        kmem_cache_alloc (mm/slub.c:2465 mm/slub.c:2476 mm/slub.c:2481)
[ 1337.001964]        __debug_object_init (lib/debugobjects.c:97 lib/debugobjects.c:311)
[ 1337.001964]        debug_object_init (lib/debugobjects.c:364)
[ 1337.001964]        hrtimer_init (kernel/hrtimer.c:432 include/linux/jump_label.h:105 include/trace/events/timer.h:130 kernel/hrtimer.c:477 kernel/hrtimer.c:1199)
[ 1337.001964]        __sched_fork (kernel/sched/core.c:1732)
[ 1337.001964]        init_idle (kernel/sched/core.c:4483)
[ 1337.001964]        fork_idle (kernel/fork.c:1566)
[ 1337.001964]        idle_threads_init (kernel/smpboot.c:54 kernel/smpboot.c:72)
[ 1337.001964]        smp_init (kernel/smp.c:493)
[ 1337.001964]        kernel_init_freeable (init/main.c:757 init/main.c:910)
[ 1337.001964]        kernel_init (init/main.c:842)
[ 1337.001964]        ret_from_fork (arch/x86/kernel/entry_64.S:555)
[ 1337.001964]
-> #2 (&rq->lock){-.-.-.}:
[ 1337.001964]        lock_acquire (arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3602)
[ 1337.001964]        _raw_spin_lock (include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:151)
[ 1337.001964]        wake_up_new_task (include/linux/sched.h:2884 kernel/sched/core.c:313 kernel/sched/core.c:2014)
[ 1337.001964]        do_fork (kernel/fork.c:1627)
[ 1337.001964]        kernel_thread (kernel/fork.c:1647)
[ 1337.001964]        rest_init (init/main.c:383)
[ 1337.001964]        start_kernel (init/main.c:653)
[ 1337.001964]        x86_64_start_reservations (arch/x86/kernel/head64.c:194)
[ 1337.001964]        x86_64_start_kernel (arch/x86/kernel/head64.c:183)
[ 1337.001964]
-> #1 (&p->pi_lock){-.-.-.}:
[ 1337.001964]        lock_acquire (arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3602)
[ 1337.001964]        _raw_spin_lock_irqsave (include/linux/spinlock_api_smp.h:117 kernel/locking/spinlock.c:159)
[ 1337.001964]        try_to_wake_up (kernel/sched/core.c:1592)
[ 1337.001964]        default_wake_function (kernel/sched/core.c:2846)
[ 1337.001964]        autoremove_wake_function (kernel/sched/wait.c:294)
[ 1337.001964]        __wake_up_common (kernel/sched/wait.c:72)
[ 1337.001964]        __wake_up (include/linux/spinlock.h:358 kernel/sched/wait.c:95)
[ 1337.001964]        wakeup_kswapd (mm/vmscan.c:3328)
[ 1337.001964]        __alloc_pages_slowpath (mm/page_alloc.c:2429 mm/page_alloc.c:2530)
[ 1337.001964]        __alloc_pages_nodemask (mm/page_alloc.c:2767)
[ 1337.001964]        alloc_pages_current (mm/mempolicy.c:2055)
[ 1337.001964]        __vmalloc_node_range (include/linux/gfp.h:339 mm/vmalloc.c:1594 mm/vmalloc.c:1650)
[ 1337.001964]        __vmalloc_node (mm/vmalloc.c:1696)
[ 1337.001964]        vmalloc (mm/vmalloc.c:1725)
[ 1337.001964]        SyS_init_module (kernel/module.c:2508 kernel/module.c:3342 kernel/module.c:3330)
[ 1337.001964]        tracesys (arch/x86/kernel/entry_64.S:749)
[ 1337.001964]
-> #0 (&pgdat->kswapd_wait){..-.-.}:
[ 1337.001964]        __lock_acquire (kernel/locking/lockdep.c:1840 kernel/locking/lockdep.c:1945 kernel/locking/lockdep.c:2131 kernel/locking/lockdep.c:3182)
[ 1337.001964]        lock_acquire (arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3602)
[ 1337.001964]        _raw_spin_lock_irqsave (include/linux/spinlock_api_smp.h:117 kernel/locking/spinlock.c:159)
[ 1337.001964]        __wake_up (kernel/sched/wait.c:94)
[ 1337.001964]        wakeup_kswapd (mm/vmscan.c:3328)
[ 1337.001964]        __alloc_pages_slowpath (mm/page_alloc.c:2429 mm/page_alloc.c:2530)
[ 1337.001964]        __alloc_pages_nodemask (mm/page_alloc.c:2767)
[ 1337.001964]        alloc_pages_current (mm/mempolicy.c:2055)
[ 1337.001964]        __get_free_pages (mm/page_alloc.c:2804)
[ 1337.001964]        alloc_loc_track (mm/slub.c:4030)
[ 1337.001964]        process_slab (mm/slub.c:4096 mm/slub.c:4130)
[ 1337.001964]        list_locations (mm/slub.c:4160)
[ 1337.001964]        alloc_calls_show (mm/slub.c:4765)
[ 1337.001964]        slab_attr_show (mm/slub.c:5011)
[ 1337.001964]        sysfs_kf_seq_show (fs/sysfs/file.c:63)
[ 1337.001964]        kernfs_seq_show (fs/kernfs/file.c:155)
[ 1337.001964]        seq_read (fs/seq_file.c:223)
[ 1337.001964]        kernfs_fop_read (fs/kernfs/file.c:230)
[ 1337.001964]        vfs_read (fs/read_write.c:408)
[ 1337.001964]        SyS_read (fs/read_write.c:519 fs/read_write.c:511)
[ 1337.001964]        tracesys (arch/x86/kernel/entry_64.S:749)
[ 1337.001964]
[ 1337.001964] other info that might help us debug this:
[ 1337.001964]
[ 1337.001964] Chain exists of:
&pgdat->kswapd_wait --> &rq->lock --> &(&n->list_lock)->rlock

[ 1337.001964]  Possible unsafe locking scenario:
[ 1337.001964]
[ 1337.001964]        CPU0                    CPU1
[ 1337.001964]        ----                    ----
[ 1337.001964]   lock(&(&n->list_lock)->rlock);
[ 1337.001964]                                lock(&rq->lock);
[ 1337.001964]                                lock(&(&n->list_lock)->rlock);
[ 1337.001964]   lock(&pgdat->kswapd_wait);
[ 1337.001964]
[ 1337.001964]  *** DEADLOCK ***
[ 1337.001964]
[ 1337.001964] 5 locks held by trinity-c24/33631:
[ 1337.001964]  #0:  (&f->f_pos_lock){+.+.+.}, at: __fdget_pos (fs/file.c:736)
[ 1337.001964]  #1:  (&p->lock){+.+.+.}, at: seq_read (fs/seq_file.c:175)
[ 1337.001964]  #2:  (&of->mutex){+.+.+.}, at: kernfs_seq_start (fs/kernfs/file.c:99)
[ 1337.001964]  #3:  (s_active#87){++++.+}, at: kernfs_seq_start (fs/kernfs/file.c:99)
[ 1337.001964]  #4:  (&(&n->list_lock)->rlock){-.-.-.}, at: list_locations (mm/slub.c:4159)
[ 1337.001964]
[ 1337.001964] stack backtrace:
[ 1337.001964] CPU: 24 PID: 33631 Comm: trinity-c24 Tainted: G        W     3.14.0-rc7-next-20140321-sasha-00018-g0516fe6-dirty #265
[ 1337.001964]  ffffffff87972190 ffff88032f1d37e8 ffffffff844b0f37 0000000000000000
[ 1337.001964]  ffffffff879d65d0 ffff88032f1d3838 ffffffff844a398b 0000000000000005
[ 1337.001964]  ffff88032f1d38c8 ffff88032f1d3838 ffff8803462f8dd0 ffff8803462f8e08
[ 1337.001964] Call Trace:
[ 1337.001964]  dump_stack (lib/dump_stack.c:52)
[ 1337.001964]  print_circular_bug (kernel/locking/lockdep.c:1216)
[ 1337.001964]  __lock_acquire (kernel/locking/lockdep.c:1840 kernel/locking/lockdep.c:1945 kernel/locking/lockdep.c:2131 kernel/locking/lockdep.c:3182)
[ 1337.001964]  ? __bfs (kernel/locking/lockdep.c:1030)
[ 1337.001964]  lock_acquire (arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3602)
[ 1337.001964]  ? __wake_up (kernel/sched/wait.c:94)
[ 1337.001964]  ? _raw_spin_lock_irqsave (include/linux/spinlock_api_smp.h:109 kernel/locking/spinlock.c:159)
[ 1337.001964]  _raw_spin_lock_irqsave (include/linux/spinlock_api_smp.h:117 kernel/locking/spinlock.c:159)
[ 1337.001964]  ? __wake_up (kernel/sched/wait.c:94)
[ 1337.001964]  ? zone_watermark_ok_safe (mm/page_alloc.c:1741)
[ 1337.001964]  __wake_up (kernel/sched/wait.c:94)
[ 1337.001964]  wakeup_kswapd (mm/vmscan.c:3328)
[ 1337.001964]  __alloc_pages_slowpath (mm/page_alloc.c:2429 mm/page_alloc.c:2530)
[ 1337.001964]  ? get_page_from_freelist (mm/page_alloc.c:1940)
[ 1337.001964]  ? sched_clock (arch/x86/include/asm/paravirt.h:192 arch/x86/kernel/tsc.c:305)
[ 1337.001964]  ? sched_clock_local (kernel/sched/clock.c:214)
[ 1337.001964]  __alloc_pages_nodemask (mm/page_alloc.c:2767)
[ 1337.001964]  alloc_pages_current (mm/mempolicy.c:2055)
[ 1337.001964]  ? __get_free_pages (mm/page_alloc.c:2804)
[ 1337.001964]  ? get_parent_ip (kernel/sched/core.c:2472)
[ 1337.001964]  __get_free_pages (mm/page_alloc.c:2804)
[ 1337.001964]  alloc_loc_track (mm/slub.c:4030)
[ 1337.001964]  process_slab (mm/slub.c:4096 mm/slub.c:4130)
[ 1337.001964]  ? list_locations (mm/slub.c:4159)
[ 1337.001964]  list_locations (mm/slub.c:4160)
[ 1337.001964]  alloc_calls_show (mm/slub.c:4765)
[ 1337.001964]  slab_attr_show (mm/slub.c:5011)
[ 1337.001964]  sysfs_kf_seq_show (fs/sysfs/file.c:63)
[ 1337.001964]  kernfs_seq_show (fs/kernfs/file.c:155)
[ 1337.001964]  seq_read (fs/seq_file.c:223)
[ 1337.001964]  kernfs_fop_read (fs/kernfs/file.c:230)
[ 1337.001964]  vfs_read (fs/read_write.c:408)
[ 1337.001964]  SyS_read (fs/read_write.c:519 fs/read_write.c:511)
[ 1337.001964]  tracesys (arch/x86/kernel/entry_64.S:749)


Thanks,
Sasha

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>

WARNING: multiple messages have this Message-ID (diff)
From: Sasha Levin <sasha.levin@oracle.com>
To: Greg KH <greg@kroah.com>, Tejun Heo <tj@kernel.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	Andrea Arcangeli <aarcange@redhat.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Rik van Riel <riel@redhat.com>, Minchan Kim <minchan@kernel.org>
Subject: mm: kswapd/kernfs possible deadlock
Date: Sun, 23 Mar 2014 09:51:32 -0400	[thread overview]
Message-ID: <532EE6E4.8070903@oracle.com> (raw)

Hi all,

While fuzzing with trinity inside KVM tools guest running latest -next kernel
I've stumbled on the following:

[ 1336.998827] ======================================================
[ 1337.000394] [ INFO: possible circular locking dependency detected ]
[ 1337.001425] 3.14.0-rc7-next-20140321-sasha-00018-g0516fe6-dirty #265 Tainted: G        W
[ 1337.001964] -------------------------------------------------------
[ 1337.001964] trinity-c24/33631 is trying to acquire lock:
[ 1337.001964]  (&pgdat->kswapd_wait){..-.-.}, at: __wake_up (kernel/sched/wait.c:94)
[ 1337.001964]
[ 1337.001964] but task is already holding lock:
[ 1337.001964]  (&(&n->list_lock)->rlock){-.-.-.}, at: list_locations (mm/slub.c:4159)
[ 1337.001964]
[ 1337.001964] which lock already depends on the new lock.
[ 1337.001964]
[ 1337.001964]
[ 1337.001964] the existing dependency chain (in reverse order) is:
[ 1337.001964]
-> #3 (&(&n->list_lock)->rlock){-.-.-.}:
[ 1337.001964]        lock_acquire (arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3602)
[ 1337.001964]        _raw_spin_lock (include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:151)
[ 1337.001964]        get_partial_node.isra.35 (mm/slub.c:1623)
[ 1337.001964]        __slab_alloc (mm/slub.c:1725 mm/slub.c:2193 mm/slub.c:2359)
[ 1337.001964]        kmem_cache_alloc (mm/slub.c:2465 mm/slub.c:2476 mm/slub.c:2481)
[ 1337.001964]        __debug_object_init (lib/debugobjects.c:97 lib/debugobjects.c:311)
[ 1337.001964]        debug_object_init (lib/debugobjects.c:364)
[ 1337.001964]        hrtimer_init (kernel/hrtimer.c:432 include/linux/jump_label.h:105 include/trace/events/timer.h:130 kernel/hrtimer.c:477 kernel/hrtimer.c:1199)
[ 1337.001964]        __sched_fork (kernel/sched/core.c:1732)
[ 1337.001964]        init_idle (kernel/sched/core.c:4483)
[ 1337.001964]        fork_idle (kernel/fork.c:1566)
[ 1337.001964]        idle_threads_init (kernel/smpboot.c:54 kernel/smpboot.c:72)
[ 1337.001964]        smp_init (kernel/smp.c:493)
[ 1337.001964]        kernel_init_freeable (init/main.c:757 init/main.c:910)
[ 1337.001964]        kernel_init (init/main.c:842)
[ 1337.001964]        ret_from_fork (arch/x86/kernel/entry_64.S:555)
[ 1337.001964]
-> #2 (&rq->lock){-.-.-.}:
[ 1337.001964]        lock_acquire (arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3602)
[ 1337.001964]        _raw_spin_lock (include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:151)
[ 1337.001964]        wake_up_new_task (include/linux/sched.h:2884 kernel/sched/core.c:313 kernel/sched/core.c:2014)
[ 1337.001964]        do_fork (kernel/fork.c:1627)
[ 1337.001964]        kernel_thread (kernel/fork.c:1647)
[ 1337.001964]        rest_init (init/main.c:383)
[ 1337.001964]        start_kernel (init/main.c:653)
[ 1337.001964]        x86_64_start_reservations (arch/x86/kernel/head64.c:194)
[ 1337.001964]        x86_64_start_kernel (arch/x86/kernel/head64.c:183)
[ 1337.001964]
-> #1 (&p->pi_lock){-.-.-.}:
[ 1337.001964]        lock_acquire (arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3602)
[ 1337.001964]        _raw_spin_lock_irqsave (include/linux/spinlock_api_smp.h:117 kernel/locking/spinlock.c:159)
[ 1337.001964]        try_to_wake_up (kernel/sched/core.c:1592)
[ 1337.001964]        default_wake_function (kernel/sched/core.c:2846)
[ 1337.001964]        autoremove_wake_function (kernel/sched/wait.c:294)
[ 1337.001964]        __wake_up_common (kernel/sched/wait.c:72)
[ 1337.001964]        __wake_up (include/linux/spinlock.h:358 kernel/sched/wait.c:95)
[ 1337.001964]        wakeup_kswapd (mm/vmscan.c:3328)
[ 1337.001964]        __alloc_pages_slowpath (mm/page_alloc.c:2429 mm/page_alloc.c:2530)
[ 1337.001964]        __alloc_pages_nodemask (mm/page_alloc.c:2767)
[ 1337.001964]        alloc_pages_current (mm/mempolicy.c:2055)
[ 1337.001964]        __vmalloc_node_range (include/linux/gfp.h:339 mm/vmalloc.c:1594 mm/vmalloc.c:1650)
[ 1337.001964]        __vmalloc_node (mm/vmalloc.c:1696)
[ 1337.001964]        vmalloc (mm/vmalloc.c:1725)
[ 1337.001964]        SyS_init_module (kernel/module.c:2508 kernel/module.c:3342 kernel/module.c:3330)
[ 1337.001964]        tracesys (arch/x86/kernel/entry_64.S:749)
[ 1337.001964]
-> #0 (&pgdat->kswapd_wait){..-.-.}:
[ 1337.001964]        __lock_acquire (kernel/locking/lockdep.c:1840 kernel/locking/lockdep.c:1945 kernel/locking/lockdep.c:2131 kernel/locking/lockdep.c:3182)
[ 1337.001964]        lock_acquire (arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3602)
[ 1337.001964]        _raw_spin_lock_irqsave (include/linux/spinlock_api_smp.h:117 kernel/locking/spinlock.c:159)
[ 1337.001964]        __wake_up (kernel/sched/wait.c:94)
[ 1337.001964]        wakeup_kswapd (mm/vmscan.c:3328)
[ 1337.001964]        __alloc_pages_slowpath (mm/page_alloc.c:2429 mm/page_alloc.c:2530)
[ 1337.001964]        __alloc_pages_nodemask (mm/page_alloc.c:2767)
[ 1337.001964]        alloc_pages_current (mm/mempolicy.c:2055)
[ 1337.001964]        __get_free_pages (mm/page_alloc.c:2804)
[ 1337.001964]        alloc_loc_track (mm/slub.c:4030)
[ 1337.001964]        process_slab (mm/slub.c:4096 mm/slub.c:4130)
[ 1337.001964]        list_locations (mm/slub.c:4160)
[ 1337.001964]        alloc_calls_show (mm/slub.c:4765)
[ 1337.001964]        slab_attr_show (mm/slub.c:5011)
[ 1337.001964]        sysfs_kf_seq_show (fs/sysfs/file.c:63)
[ 1337.001964]        kernfs_seq_show (fs/kernfs/file.c:155)
[ 1337.001964]        seq_read (fs/seq_file.c:223)
[ 1337.001964]        kernfs_fop_read (fs/kernfs/file.c:230)
[ 1337.001964]        vfs_read (fs/read_write.c:408)
[ 1337.001964]        SyS_read (fs/read_write.c:519 fs/read_write.c:511)
[ 1337.001964]        tracesys (arch/x86/kernel/entry_64.S:749)
[ 1337.001964]
[ 1337.001964] other info that might help us debug this:
[ 1337.001964]
[ 1337.001964] Chain exists of:
&pgdat->kswapd_wait --> &rq->lock --> &(&n->list_lock)->rlock

[ 1337.001964]  Possible unsafe locking scenario:
[ 1337.001964]
[ 1337.001964]        CPU0                    CPU1
[ 1337.001964]        ----                    ----
[ 1337.001964]   lock(&(&n->list_lock)->rlock);
[ 1337.001964]                                lock(&rq->lock);
[ 1337.001964]                                lock(&(&n->list_lock)->rlock);
[ 1337.001964]   lock(&pgdat->kswapd_wait);
[ 1337.001964]
[ 1337.001964]  *** DEADLOCK ***
[ 1337.001964]
[ 1337.001964] 5 locks held by trinity-c24/33631:
[ 1337.001964]  #0:  (&f->f_pos_lock){+.+.+.}, at: __fdget_pos (fs/file.c:736)
[ 1337.001964]  #1:  (&p->lock){+.+.+.}, at: seq_read (fs/seq_file.c:175)
[ 1337.001964]  #2:  (&of->mutex){+.+.+.}, at: kernfs_seq_start (fs/kernfs/file.c:99)
[ 1337.001964]  #3:  (s_active#87){++++.+}, at: kernfs_seq_start (fs/kernfs/file.c:99)
[ 1337.001964]  #4:  (&(&n->list_lock)->rlock){-.-.-.}, at: list_locations (mm/slub.c:4159)
[ 1337.001964]
[ 1337.001964] stack backtrace:
[ 1337.001964] CPU: 24 PID: 33631 Comm: trinity-c24 Tainted: G        W     3.14.0-rc7-next-20140321-sasha-00018-g0516fe6-dirty #265
[ 1337.001964]  ffffffff87972190 ffff88032f1d37e8 ffffffff844b0f37 0000000000000000
[ 1337.001964]  ffffffff879d65d0 ffff88032f1d3838 ffffffff844a398b 0000000000000005
[ 1337.001964]  ffff88032f1d38c8 ffff88032f1d3838 ffff8803462f8dd0 ffff8803462f8e08
[ 1337.001964] Call Trace:
[ 1337.001964]  dump_stack (lib/dump_stack.c:52)
[ 1337.001964]  print_circular_bug (kernel/locking/lockdep.c:1216)
[ 1337.001964]  __lock_acquire (kernel/locking/lockdep.c:1840 kernel/locking/lockdep.c:1945 kernel/locking/lockdep.c:2131 kernel/locking/lockdep.c:3182)
[ 1337.001964]  ? __bfs (kernel/locking/lockdep.c:1030)
[ 1337.001964]  lock_acquire (arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3602)
[ 1337.001964]  ? __wake_up (kernel/sched/wait.c:94)
[ 1337.001964]  ? _raw_spin_lock_irqsave (include/linux/spinlock_api_smp.h:109 kernel/locking/spinlock.c:159)
[ 1337.001964]  _raw_spin_lock_irqsave (include/linux/spinlock_api_smp.h:117 kernel/locking/spinlock.c:159)
[ 1337.001964]  ? __wake_up (kernel/sched/wait.c:94)
[ 1337.001964]  ? zone_watermark_ok_safe (mm/page_alloc.c:1741)
[ 1337.001964]  __wake_up (kernel/sched/wait.c:94)
[ 1337.001964]  wakeup_kswapd (mm/vmscan.c:3328)
[ 1337.001964]  __alloc_pages_slowpath (mm/page_alloc.c:2429 mm/page_alloc.c:2530)
[ 1337.001964]  ? get_page_from_freelist (mm/page_alloc.c:1940)
[ 1337.001964]  ? sched_clock (arch/x86/include/asm/paravirt.h:192 arch/x86/kernel/tsc.c:305)
[ 1337.001964]  ? sched_clock_local (kernel/sched/clock.c:214)
[ 1337.001964]  __alloc_pages_nodemask (mm/page_alloc.c:2767)
[ 1337.001964]  alloc_pages_current (mm/mempolicy.c:2055)
[ 1337.001964]  ? __get_free_pages (mm/page_alloc.c:2804)
[ 1337.001964]  ? get_parent_ip (kernel/sched/core.c:2472)
[ 1337.001964]  __get_free_pages (mm/page_alloc.c:2804)
[ 1337.001964]  alloc_loc_track (mm/slub.c:4030)
[ 1337.001964]  process_slab (mm/slub.c:4096 mm/slub.c:4130)
[ 1337.001964]  ? list_locations (mm/slub.c:4159)
[ 1337.001964]  list_locations (mm/slub.c:4160)
[ 1337.001964]  alloc_calls_show (mm/slub.c:4765)
[ 1337.001964]  slab_attr_show (mm/slub.c:5011)
[ 1337.001964]  sysfs_kf_seq_show (fs/sysfs/file.c:63)
[ 1337.001964]  kernfs_seq_show (fs/kernfs/file.c:155)
[ 1337.001964]  seq_read (fs/seq_file.c:223)
[ 1337.001964]  kernfs_fop_read (fs/kernfs/file.c:230)
[ 1337.001964]  vfs_read (fs/read_write.c:408)
[ 1337.001964]  SyS_read (fs/read_write.c:519 fs/read_write.c:511)
[ 1337.001964]  tracesys (arch/x86/kernel/entry_64.S:749)


Thanks,
Sasha

             reply	other threads:[~2014-03-23 13:52 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-03-23 13:51 Sasha Levin [this message]
2014-03-23 13:51 ` mm: kswapd/kernfs possible deadlock Sasha Levin

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=532EE6E4.8070903@oracle.com \
    --to=sasha.levin@oracle.com \
    --cc=aarcange@redhat.com \
    --cc=akpm@linux-foundation.org \
    --cc=greg@kroah.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mm@kvack.org \
    --cc=minchan@kernel.org \
    --cc=riel@redhat.com \
    --cc=tj@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.