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Date: Mon, 27 Jun 2011 11:49:39 +0900
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To: akpm@...ux-foundation.org
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
linux-fsdevel@...r.kernel.org
Subject: Re: mmotm 2011-06-22-13-05 uploaded
On Wed, 22 Jun 2011 13:05:19 -0700
akpm@...ux-foundation.org wrote:
> The mm-of-the-moment snapshot 2011-06-22-13-05 has been uploaded to
>
> http://userweb.kernel.org/~akpm/mmotm/
>
> and will soon be available at
> git://zen-kernel.org/kernel/mmotm.git
> or
> git://git.cmpxchg.org/linux-mmotm.git
>
> It contains the following patches against 3.0-rc4:
>
It may be too late but this was reported on KVM guest.
==
[ 490.359961]
[ 490.360944] =================================
[ 490.360944] [ INFO: inconsistent lock state ]
[ 490.360944] 3.0.0-rc4-mm1 #1
[ 490.360944] ---------------------------------
[ 490.360944] inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage.
[ 490.360944] kworker/0:0/0 [HC1[1]:SC0[0]:HE0:SE1] takes:
[ 490.360944] (&(&mapping->tree_lock)->rlock){?.+...}, at: [<ffffffff8110cbea> ] test_clear_page_writeback+0x6a/0x160
[ 490.360944] {HARDIRQ-ON-W} state was registered at:
[ 490.360944] [<ffffffff81097069>] __lock_acquire+0x609/0x1670
[ 490.360944] [<ffffffff81098754>] lock_acquire+0xa4/0x120
[ 490.360944] [<ffffffff8159e396>] _raw_spin_lock+0x36/0x70
[ 490.360944] [<ffffffff8117d7e6>] end_writeback+0x36/0xd0
[ 490.360944] [<ffffffff8117d982>] evict+0x102/0x180
[ 490.360944] [<ffffffff8117ddda>] iput+0xea/0x1c0
[ 490.360944] [<ffffffff81172d2c>] do_unlinkat+0x16c/0x1d0
[ 490.360944] [<ffffffff81172da6>] sys_unlink+0x16/0x20
[ 490.360944] [<ffffffff815a6fc2>] system_call_fastpath+0x16/0x1b
[ 490.360944] irq event stamp: 85616
[ 490.360944] hardirqs last enabled at (85613): [<ffffffff810140a1>] default_i dle+0x61/0x190
[ 490.360944] hardirqs last disabled at (85614): [<ffffffff8159efea>] save_args +0x6a/0x70
[ 490.360944] softirqs last enabled at (85616): [<ffffffff8105fc83>] _local_bh _enable+0x13/0x20
[ 490.360944] softirqs last disabled at (85615): [<ffffffff8105fd05>] irq_enter +0x75/0x90
[ 490.360944]
[ 490.360944] other info that might help us debug this:
[ 490.360944] Possible unsafe locking scenario:
[ 490.360944]
[ 490.360944] CPU0
[ 490.360944] ----
[ 490.360944] lock(&(&mapping->tree_lock)->rlock);
[ 490.360944] <Interrupt>
[ 490.360944] lock(&(&mapping->tree_lock)->rlock);
[ 490.360944]
[ 490.360944] *** DEADLOCK ***
[ 490.360944]
[ 490.360944] 1 lock held by kworker/0:0/0:
[ 490.360944] #0: (&(&vblk->lock)->rlock){-.-...}, at: [<ffffffffa000f1ab>] blk_done+0x2b/0x120 [virtio_blk]
[ 490.360944]
[ 490.360944] stack backtrace:
[ 490.360944] Pid: 0, comm: kworker/0:0 Not tainted 3.0.0-rc4-mm1 #1
[ 490.360944] Call Trace:
[ 490.360944] <IRQ> [<ffffffff810957f5>] print_usage_bug+0x235/0x280
[ 490.360944] [<ffffffff810962d6>] mark_lock+0x346/0x410
[ 490.360944] [<ffffffff810971f9>] __lock_acquire+0x799/0x1670
[ 490.360944] [<ffffffff81032059>] ? kvm_clock_read+0x19/0x20
[ 490.360944] [<ffffffff81032dc8>] ? pvclock_clocksource_read+0x58/0xd0
[ 490.360944] [<ffffffff81032dc8>] ? pvclock_clocksource_read+0x58/0xd0
[ 490.360944] [<ffffffff81085135>] ? sched_clock_local+0x25/0x90
[ 490.360944] [<ffffffff8110cbea>] ? test_clear_page_writeback+0x6a/0x160
[ 490.360944] [<ffffffff81098754>] lock_acquire+0xa4/0x120
[ 490.360944] [<ffffffff8110cbea>] ? test_clear_page_writeback+0x6a/0x160
[ 490.360944] [<ffffffff81085135>] ? sched_clock_local+0x25/0x90
[ 490.360944] [<ffffffff8159e545>] _raw_spin_lock_irqsave+0x55/0xa0
[ 490.360944] [<ffffffff8110cbea>] ? test_clear_page_writeback+0x6a/0x160
[ 490.360944] [<ffffffff81096cab>] ? __lock_acquire+0x24b/0x1670
[ 490.360944] [<ffffffff8110cbea>] test_clear_page_writeback+0x6a/0x160
[ 490.360944] [<ffffffff811012c4>] end_page_writeback+0x24/0x60
[ 490.360944] [<ffffffff81193dca>] end_buffer_async_write+0x13a/0x220
[ 490.360944] [<ffffffff81085258>] ? sched_clock_cpu+0xb8/0x110
[ 490.360944] [<ffffffff811922c0>] end_bio_bh_io_sync+0x30/0x50
[ 490.360944] [<ffffffff811969ad>] bio_endio+0x1d/0x40
[ 490.360944] [<ffffffff812a73a3>] req_bio_endio+0xa3/0xe0
[ 490.360944] [<ffffffff812a8294>] blk_update_request+0x104/0x4e0
[ 490.360944] [<ffffffff812a84e1>] ? blk_update_request+0x351/0x4e0
[ 490.360944] [<ffffffff8109244d>] ? trace_hardirqs_off+0xd/0x10
[ 490.360944] [<ffffffff812a8697>] blk_update_bidi_request+0x27/0xb0
[ 490.360944] [<ffffffff812a99ee>] __blk_end_request_all+0x2e/0x60
[ 490.360944] [<ffffffffa000f1cb>] blk_done+0x4b/0x120 [virtio_blk]
[ 490.360944] [<ffffffffa00052fc>] vring_interrupt+0x3c/0xb0 [virtio_ring]
[ 490.360944] [<ffffffff810c6f3d>] handle_irq_event_percpu+0x5d/0x210
[ 490.360944] [<ffffffff810c713e>] handle_irq_event+0x4e/0x80
[ 490.360944] [<ffffffff810ca213>] handle_edge_irq+0x83/0x140
[ 490.360944] [<ffffffff8100d40c>] handle_irq+0x4c/0xa0
[ 490.360944] [<ffffffff815a8acd>] do_IRQ+0x5d/0xe0
[ 490.360944] [<ffffffff8159f093>] common_interrupt+0x13/0x13
[ 490.360944] <EOI> [<ffffffff810320bb>] ? native_safe_halt+0xb/0x10
[ 490.360944] [<ffffffff8109677d>] ? trace_hardirqs_on+0xd/0x10
[ 490.360944] [<ffffffff810140a6>] default_idle+0x66/0x190
[ 490.360944] [<ffffffff8100b0ac>] cpu_idle+0xbc/0x110
[ 490.360944] [<ffffffff815950ca>] start_secondary+0x256/0x258
[ OK ]
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