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
