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Message-Id: <20231102062836.19074-2-lirongqing@baidu.com> Date: Thu, 2 Nov 2023 14:28:36 +0800 From: Li RongQing <lirongqing@...du.com> To: netdev@...r.kernel.org Subject: [PATCH 2/2][net-next] rtnetlink: using alloc_large_skb in rtnl_getlink if a PF has 256 or more VFs, ip link command will allocate a order 3 memory and maybe trigger OOM due to memory fragement, rtnl_vfinfo_size is used to compute the VFs needed memory size so using alloc_large_skb in which vmalloc is used for large memory, to avoid the failure of allocating memory ip invoked oom-killer: gfp_mask=0xc2cc0(GFP_KERNEL|__GFP_NOWARN|\ __GFP_COMP|__GFP_NOMEMALLOC), order=3, oom_score_adj=0 CPU: 74 PID: 204414 Comm: ip Kdump: loaded Tainted: P OE Call Trace: dump_stack+0x57/0x6a dump_header+0x4a/0x210 oom_kill_process+0xe4/0x140 out_of_memory+0x3e8/0x790 __alloc_pages_slowpath.constprop.116+0x953/0xc50 __alloc_pages_nodemask+0x2af/0x310 kmalloc_large_node+0x38/0xf0 __kmalloc_node_track_caller+0x417/0x4d0 __kmalloc_reserve.isra.61+0x2e/0x80 __alloc_skb+0x82/0x1c0 rtnl_getlink+0x24f/0x370 rtnetlink_rcv_msg+0x12c/0x350 netlink_rcv_skb+0x50/0x100 netlink_unicast+0x1b2/0x280 netlink_sendmsg+0x355/0x4a0 sock_sendmsg+0x5b/0x60 ____sys_sendmsg+0x1ea/0x250 ___sys_sendmsg+0x88/0xd0 __sys_sendmsg+0x5e/0xa0 do_syscall_64+0x33/0x40 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f95a65a5b70 Signed-off-by: Li RongQing <lirongqing@...du.com> --- net/core/rtnetlink.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index 4a2ec33..be43044 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -3813,7 +3813,8 @@ static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr *nlh, goto out; err = -ENOBUFS; - nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL); + nskb = alloc_large_skb( + nlmsg_total_size(if_nlmsg_size(dev, ext_filter_mask)), 0); if (nskb == NULL) goto out; -- 2.9.4
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