Subject: Re: BUG: No init found on NFSROOT

From: Fengguang Wu <[email-masked]>
Date: Wed, 27 Jun 2012 01:29:18 +0800

On Tue, Jun 26, 2012 at 10:54:32PM +0800, Fengguang Wu wrote:
> Hi Trond,
> 
> It's found that this commit in linux-next leads to the below boot hang.
> 
> da660bb2774ff21c7263b4061198c5abe0629cb4 is the first bad commit
> commit da660bb2774ff21c7263b4061198c5abe0629cb4
> Author: Trond Myklebust <[email-masked]>
> Date:   Thu Jun 21 14:53:10 2012 -0400
> 
>     SUNRPC: Clean up xdr_read_pages and xdr_enter_page
> 
>     Move the page alignment code into a separate helper.
> 
>     Signed-off-by: Trond Myklebust <[email-masked]>
> 
> :040000 040000 742f2939849ea8ff2e4b954316e6ea2933e7e018 6809fe8bd11b9f2459168d6e1dac92b0c5a74eef M      net
> bisect run success
> 
> The "held lock freed" message may or may not appear in the tests.

Ah that seem to be an independent bug. It's still there when reverting
the above commit on top of linux-next. Will try to bisect it.

> However the "No init found." message reliably appears in all test runs.

That "No init found" disappears after reverting the commit.

Thanks,
Fengguang

> [  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.
> [  134.025782] debug: unmapping init [mem 0xffffffff84437000-0xffffffff8480efff]
> [  134.027686] Write protecting the kernel read-only data: 49152k
> [  134.029956] debug: unmapping init [mem 0xffff880002eb0000-0xffff880002ffffff]
> [  134.031745] debug: unmapping init [mem 0xffff880003e95000-0xffff880003ffffff]
> [  134.059408] request_module: runaway loop modprobe binfmt-0000
> [  134.062946] kworker/u:0 (2781) used greatest stack depth: 3432 bytes left
> [  134.069553] Kernel panic - not syncing: No init found.  Try passing init= option to kernel. See Linux Documentation/init.txt for guidance.
> [  134.072742] Pid: 1, comm: swapper/0 Not tainted 3.5.0-rc4+ #5
> [  134.074200] Call Trace:
> [  134.074971]  [<ffffffff82e4fc90>] panic+0xbd/0x1d0
> [  134.076237]  [<ffffffff82e4ccc7>] init_post+0xc8/0xc8
> [  134.077636]  [<ffffffff8460dd8e>] kernel_init+0x1c5/0x1c5
> [  134.078979]  [<ffffffff8460d590>] ? do_early_param+0x8c/0x8c
> [  134.080408]  [<ffffffff82ea7ef4>] kernel_thread_helper+0x4/0x10
> [  134.082038]  [<ffffffff82ea00f0>] ? retint_restore_args+0x13/0x13
> [  134.083514]  [<ffffffff8460dbc9>] ? start_kernel+0x3e7/0x3e7
> [  134.084997]  [<ffffffff82ea7ef0>] ? gs_change+0x13/0x13
> 
> Thanks,
> Fengguang
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