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. 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