Date:   Fri, 28 Apr 2017 08:40:54 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Yury Norov <ynorov@...iumnetworks.com>,
        Mark Rutland <mark.rutland@....com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, davem@...emloft.net
Subject: Re: arm64: next-20170428 hangs on boot

On 04/28/2017 08:09 AM, Yury Norov wrote:
> On Fri, Apr 28, 2017 at 03:52:34PM +0100, Mark Rutland wrote:
>> On Fri, Apr 28, 2017 at 04:24:29PM +0300, Yury Norov wrote:
>>> Hi all,
>>
>> Hi,
>>
>> [adding Dave Miller, netdev, lkml]
> 
> thanks
> 
>>> On QEMU the next-20170428 hangs on boot for me due to kernel panic in 
>>> rtnetlink_init():
>>>
>>> void __init rtnetlink_init(void)
>>> {
>>>         if (register_pernet_subsys(&rtnetlink_net_ops))
>>>                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
>>>
>>>         ...
>>> }
>>
>> I see the same thing with a next-20170428 arm64 defconfig, on a Juno R1
>> system:
>>
>> [    0.531949] Kernel panic - not syncing: rtnetlink_init: cannot initialize rtnetlink
>> [    0.531949] 
>> [    0.541271] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.11.0-rc8-next-20170428-00002-g6ee3799 #10
>> [    0.550307] Hardware name: ARM Juno development board (r1) (DT)
>> [    0.556332] Call trace:
>> [    0.558833] [<ffff000008088538>] dump_backtrace+0x0/0x238
>> [    0.564332] [<ffff000008088834>] show_stack+0x14/0x20
>> [    0.569477] [<ffff00000839dd54>] dump_stack+0x9c/0xc0
>> [    0.574622] [<ffff000008175344>] panic+0x11c/0x28c
>> [    0.579505] [<ffff000008d80034>] rtnetlink_init+0x2c/0x1d0
>> [    0.585092] [<ffff000008d8047c>] netlink_proto_init+0x14c/0x17c
>> [    0.591119] [<ffff000008083150>] do_one_initcall+0x38/0x120
>> [    0.596796] [<ffff000008d30d00>] kernel_init_freeable+0x1a0/0x240
>> [    0.603003] [<ffff00000892a790>] kernel_init+0x10/0x100
>> [    0.608324] [<ffff000008082ec0>] ret_from_fork+0x10/0x50
>> [    0.613736] SMP: stopping secondary CPUs
>> [    0.617738] ---[ end Kernel panic - not syncing: rtnetlink_init: cannot initialize rtnetlink
>>
>> If this isn't a known issue, it would be worth trying to bisect this.

It's fixed already by this commit in net-next:

https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git/commit/?id=2d2ab658d2debcb4c0e29c9e6f18e5683f3077bf

> 
> The exact function that fails is: 
> include/linux/rhashtable.h
> static inline void *__rhashtable_insert_fast(
>         struct rhashtable *ht, const void *key, struct rhash_head *obj,
>         const struct rhashtable_params params, bool rhlist)
> {
>         ...
> 
>         data = ERR_PTR(-E2BIG);
>         if (unlikely(rht_grow_above_max(ht, tbl)))
>                goto out;
>         ...
> 
> out:
>         spin_unlock_bh(lock);
>         rcu_read_unlock();
> 
>         return data;
> }
> 
> And the backtrace:
> #0  __rhashtable_insert_fast (rhlist=<optimized out>, params=..., obj=<optimized out>, 
>     key=<optimized out>, ht=<optimized out>) at ./include/linux/rhashtable.h:803
> #1  rhashtable_lookup_insert_key (params=..., obj=<optimized out>, key=<optimized out>, 
>     ht=<optimized out>) at ./include/linux/rhashtable.h:980
> #2  __netlink_insert (sk=<optimized out>, table=<optimized out>) at net/netlink/af_netlink.c:484
> #3  netlink_insert (sk=0xffff80003da85000, portid=0) at net/netlink/af_netlink.c:548
> #4  0xffff00000876c5a0 in __netlink_kernel_create (net=<optimized out>, unit=0, module=0x0, 
>     cfg=0xffff80003d84fc60) at net/netlink/af_netlink.c:1996
> #5  0xffff000008756704 in netlink_kernel_create (cfg=<optimized out>, unit=<optimized out>, 
>     net=<optimized out>) at ./include/linux/netlink.h:62
> #6  rtnetlink_net_init (net=0xffff000008c7c100 <init_net>) at net/core/rtnetlink.c:4175
> #7  0xffff000008737a2c in ops_init (ops=0xffff000008c7e268 <rtnetlink_net_ops>, 
>     net=0xffff000008c7c100 <init_net>) at net/core/net_namespace.c:117
> #8  0xffff000008738704 in __register_pernet_operations (ops=<optimized out>,
>     list=<optimized out>) at net/core/net_namespace.c:818
> #9  register_pernet_operations (list=<optimized out>, ops=0xffff000008c7e268
>     <rtnetlink_net_ops>) at net/core/net_namespace.c:892
> #10 0xffff0000087387fc in register_pernet_subsys (ops=0xffff000008c7e268
>     <rtnetlink_net_ops>) at net/core/net_namespace.c:934
> #11 0xffff000008b5b9b8 in rtnetlink_init () at net/core/rtnetlink.c:4195
> #12 0xffff000008b5be08 in netlink_proto_init () at net/netlink/af_netlink.c:2730
> #13 0xffff000008083158 in do_one_initcall (fn=0xffff000008b5bcc4 <netlink_proto_init>) at init/main.c:795
> #14 0xffff000008b20d04 in do_initcall_level (level=<optimized out>) at init/main.c:861
> #15 do_initcalls () at init/main.c:869
> #16 do_basic_setup () at init/main.c:887
> 
> Yury
> 
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> 


-- 
Florian

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