Message-ID: <20120627122306.GA19252@localhost>
Date:	Wed, 27 Jun 2012 20:23:06 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Trond Myklebust <Trond.Myklebust@...app.com>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	linux-nfs@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>,
	Pekka Enberg <penberg@...nel.org>,
	Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: BUG: No init found on NFSROOT

Hi Christoph,

It's a surprise that it bisects down to this commit. I confirmed
that it boots reliably if reverting this commit on top of linux-next.

8c138bc00925521c4e764269db3a903bd2a51592 is the first bad commit
commit 8c138bc00925521c4e764269db3a903bd2a51592
Author: Christoph Lameter <cl@...ux.com>
Date:   Wed Jun 13 10:24:58 2012 -0500

    slab: Get rid of obj_size macro

    The size of the slab object is frequently needed. Since we now
    have a size field directly in the kmem_cache structure there is no
    need anymore of the obj_size macro/function.

    Signed-off-by: Christoph Lameter <cl@...ux.com>
    Signed-off-by: Pekka Enberg <penberg@...nel.org>

:040000 040000 e0418be654b66b2364add59bb469024fd6958791 f6be0da4d4740844ab8a4c561dbe3815a3f9b8b4 M      mm
bisect run success

> > [  133.909702] =========================
> > [  133.910694] [ BUG: held lock freed! ]
> > [  133.911700] 3.5.0-rc4+ #5 Not tainted
> > [  133.912672] -------------------------
> > [  133.912969] swapper/0/0 is freeing memory ffff88001233ce08-ffff88001233de07, with a lock still held there!
> > [  133.912969]  (slock-AF_INET-RPC/1){+.-...}, at: [<ffffffff82ae84ee>] tcp_v4_rcv+0x28b/0x6fc
> > [  133.912969] 3 locks held by swapper/0/0:
> > [  133.912969]  #0:  (rcu_read_lock){.+.+..}, at: [<ffffffff82a1ea8a>] rcu_lock_acquire+0x0/0x29
> > [  133.912969]  #1:  (rcu_read_lock){.+.+..}, at: [<ffffffff82aca483>] rcu_lock_acquire.constprop.14+0x0/0x30
> > [  133.912969]  #2:  (slock-AF_INET-RPC/1){+.-...}, at: [<ffffffff82ae84ee>] tcp_v4_rcv+0x28b/0x6fc
> > [  133.912969] 
> > [  133.912969] stack backtrace:
> > [  133.912969] Pid: 0, comm: swapper/0 Not tainted 3.5.0-rc4+ #5
> > [  133.912969] Call Trace:
> > [  133.912969]  <IRQ>  [<ffffffff810e09ae>] debug_check_no_locks_freed+0x109/0x14b
> > [  133.912969]  [<ffffffff811774e0>] kmem_cache_free+0x2e/0xa7
> > [  133.912969]  [<ffffffff82a191e5>] __kfree_skb+0x7f/0x83
> > [  133.912969]  [<ffffffff82adeccd>] tcp_ack+0x45d/0xc6a
> > [  133.912969]  [<ffffffff810c22ae>] ? local_clock+0x3b/0x52
> > [  133.912969]  [<ffffffff82adff44>] tcp_rcv_state_process+0x15a/0x7c6
> > [  133.912969]  [<ffffffff82ae79e7>] tcp_v4_do_rcv+0x341/0x390
> > [  133.912969]  [<ffffffff82ae88db>] tcp_v4_rcv+0x678/0x6fc
> > [  133.912969]  [<ffffffff82aca618>] ip_local_deliver_finish+0x165/0x1e4
> > [  133.912969]  [<ffffffff82acab4a>] ip_local_deliver+0x53/0x84
> > [  133.912969]  [<ffffffff810c228c>] ? local_clock+0x19/0x52
> > [  133.912969]  [<ffffffff82aca9c6>] ip_rcv_finish+0x32f/0x367
> > [  133.912969]  [<ffffffff82acad8b>] ip_rcv+0x210/0x269
> > [  133.912969]  [<ffffffff82a1eab1>] ? rcu_lock_acquire+0x27/0x29
> > [  133.912969]  [<ffffffff82a1ea8a>] ? softnet_seq_show+0x68/0x68
> > [  133.912969]  [<ffffffff82a21ede>] __netif_receive_skb+0x3cd/0x464
> > [  133.912969]  [<ffffffff82a21fda>] netif_receive_skb+0x65/0x9c
> > [  133.912969]  [<ffffffff82a227c5>] ? __napi_gro_receive+0xf2/0xff
> > [  133.912969]  [<ffffffff82a2209e>] napi_skb_finish+0x26/0x58
> > [  133.912969]  [<ffffffff810c228c>] ? local_clock+0x19/0x52
> > [  133.912969]  [<ffffffff82a228c5>] napi_gro_receive+0x2f/0x34
> > [  133.912969]  [<ffffffff81e36d12>] e1000_receive_skb+0x57/0x60
> > [  133.912969]  [<ffffffff81e39b23>] e1000_clean_rx_irq+0x2f2/0x387
> > [  133.912969]  [<ffffffff81e390f3>] e1000_clean+0x541/0x695
> > [  133.912969]  [<ffffffff8106c57b>] ? kvm_clock_read+0x2e/0x36
> > [  133.912969]  [<ffffffff82a22402>] ? net_rx_action+0x1b3/0x1f8
> > [  133.912969]  [<ffffffff82a22302>] net_rx_action+0xb3/0x1f8
> > [  133.912969]  [<ffffffff810984ab>] ? __do_softirq+0x76/0x1e8
> > [  133.912969]  [<ffffffff81098515>] __do_softirq+0xe0/0x1e8
> > [  133.912969]  [<ffffffff81122190>] ? time_hardirqs_off+0x26/0x2a
> > [  133.912969]  [<ffffffff82ea7fec>] call_softirq+0x1c/0x30
> > [  133.912969]  [<ffffffff81049cc8>] do_softirq+0x4a/0xa2
> > [  133.912969]  [<ffffffff8109888e>] irq_exit+0x51/0xbc
> > [  133.912969]  [<ffffffff82ea88ae>] do_IRQ+0x8e/0xa5
> > [  133.912969]  [<ffffffff82ea002f>] common_interrupt+0x6f/0x6f
> > [  133.912969]  <EOI>  [<ffffffff8106c76b>] ? native_safe_halt+0x6/0x8
> > [  133.912969]  [<ffffffff810e08a3>] ? trace_hardirqs_on+0xd/0xf
> > [  133.912969]  [<ffffffff8104f384>] default_idle+0x53/0x90
> > [  133.912969]  [<ffffffff8104fc09>] cpu_idle+0xcc/0x123
> > [  133.912969]  [<ffffffff82d1d8dd>] rest_init+0xd1/0xda
> > [  133.912969]  [<ffffffff82d1d80c>] ? csum_partial_copy_generic+0x16c/0x16c
> > [  133.912969]  [<ffffffff8460dbbc>] start_kernel+0x3da/0x3e7
> > [  133.912969]  [<ffffffff8460d5ea>] ? repair_env_string+0x5a/0x5a
> > [  133.912969]  [<ffffffff8460d2d6>] x86_64_start_reservations+0xb1/0xb5
> > [  133.912969]  [<ffffffff8460d3d8>] x86_64_start_kernel+0xfe/0x10b
> > [  134.024230] VFS: Mounted root (nfs filesystem) on device 0:14.

Thanks,
Fengguang
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