On Thu, Nov 2, 2017 at 12:06 PM, Florian Westphal <f...@strlen.de> wrote: > Cong Wang <xiyou.wangc...@gmail.com> wrote: >> > CPU: 0 PID: 23859 Comm: syz-executor2 Not tainted 4.14.0-rc5+ #140 >> > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS >> > Google 01/01/2011 >> > Call Trace: >> > __dump_stack lib/dump_stack.c:16 [inline] >> > dump_stack+0x194/0x257 lib/dump_stack.c:52 >> > lockdep_rcu_suspicious+0x123/0x170 kernel/locking/lockdep.c:4665 >> > __in_dev_get_rtnl include/linux/inetdevice.h:230 [inline] >> > fib_dump_info+0x1136/0x13d0 net/ipv4/fib_semantics.c:1377 >> > inet_rtm_getroute+0xf97/0x2d70 net/ipv4/route.c:2785 >> >> This is introduced by: >> >> commit 394f51abb3d04f33fb798f04b16ae6b0491ea4ec >> Author: Florian Westphal <f...@strlen.de> >> Date: Tue Aug 15 16:34:44 2017 +0200 >> >> ipv4: route: set ipv4 RTM_GETROUTE to not use rtnl >> >> Signed-off-by: Florian Westphal <f...@strlen.de> >> Signed-off-by: David S. Miller <da...@davemloft.net> >> >> Looks like we need a wrapper for rcu_dereference_protected(dev->ip_ptr). > > Yes, thats the alternative to > https://patchwork.ozlabs.org/patch/833401/ > > which switches to _rcu version.
Yeah, that works too.