On 2020/11/20 18:30, Yang Yingliang wrote:
Hi,
I got a memleak report when doing fault-inject test:
unreferenced object 0xffff88810ace9000 (size 1024):
comm "ip", pid 4622, jiffies 4295457037 (age 43.378s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<00000000008abe41>] __kmalloc+0x10f/0x210
[<000000005d3533a6>] veth_dev_init+0x140/0x310
[<0000000088353c64>] register_netdevice+0x496/0x7a0
[<000000001324d322>] veth_newlink+0x40b/0x960
[<00000000d0799866>] __rtnl_newlink+0xd8c/0x1360
[<00000000d616040a>] rtnl_newlink+0x6b/0xa0
[<00000000e0a1600d>] rtnetlink_rcv_msg+0x3cc/0x9e0
[<000000009eeff98b>] netlink_rcv_skb+0x130/0x3a0
[<00000000500f8be1>] netlink_unicast+0x4da/0x700
[<00000000666c03b3>] netlink_sendmsg+0x7fe/0xcb0
[<0000000073b28103>] sock_sendmsg+0x143/0x180
[<00000000ad746a30>] ____sys_sendmsg+0x677/0x810
[<0000000087dd98e5>] ___sys_sendmsg+0x105/0x180
[<00000000028dd365>] __sys_sendmsg+0xf0/0x1c0
[<00000000a6bfbae6>] do_syscall_64+0x33/0x40
[<00000000e00521b4>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
If call_netdevice_notifiers() failed in register_netdevice(),
dev->priv_destructor() is not called, it will cause memleak.
Fix this by assigning ndo_uninit with veth_dev_free(), so
the memory can be freed in rollback_registered();
We have discussed this before and it seems we should fix
register_netdevice() rather than each driver.
https://patchwork.ozlabs.org/project/netdev/patch/[email protected]/
Toshiaki Makita
