On Sun, 21 Feb 2021 15:45:52 +0000 Taehee Yoo wrote:
> The debug check must be done after unregister_netdevice_many() call --
> the hlist_del_rcu() for this is done inside .ndo_stop.
>
> This is the same with commit 0fda7600c2e1 ("geneve: move debug check after
> netdev unregister")
>
> Test commands:
> ip netns del A
> ip netns add A
> ip netns add B
>
> ip netns exec B ip link add vxlan0 type vxlan vni 100 local 10.0.0.1 \
> remote 10.0.0.2 dstport 4789 srcport 4789 4789
> ip netns exec B ip link set vxlan0 netns A
> ip netns exec A ip link set vxlan0 up
> ip netns del B
>
> Splat looks like:
> [ 73.176249][ T7] ------------[ cut here ]------------
> [ 73.178662][ T7] WARNING: CPU: 4 PID: 7 at drivers/net/vxlan.c:4743
> vxlan_exit_batch_net+0x52e/0x720 [vxlan]
> [ 73.182597][ T7] Modules linked in: vxlan openvswitch nsh nf_conncount
> nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 mlx5_core nfp mlxfw ixgbevf
> tls sch_fq_codel nf_tables nfnetlink ip_tables x_tables unix
> [ 73.190113][ T7] CPU: 4 PID: 7 Comm: kworker/u16:0 Not tainted
> 5.11.0-rc7+ #838
> [ 73.193037][ T7] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
> BIOS 1.10.2-1ubuntu1 04/01/2014
> [ 73.196986][ T7] Workqueue: netns cleanup_net
> [ 73.198946][ T7] RIP: 0010:vxlan_exit_batch_net+0x52e/0x720 [vxlan]
> [ 73.201509][ T7] Code: 00 01 00 00 0f 84 39 fd ff ff 48 89 ca 48 c1 ea
> 03 80 3c 1a 00 0f 85 a6 00 00 00 89 c2 48 83 c2 02 49 8b 14 d4 48 85 d2 74 ce
> <0f> 0b eb ca e8 b9 51 db dd 84 c0 0f 85 4a fe ff ff 48 c7 c2 80 bc
> [ 73.208813][ T7] RSP: 0018:ffff888100907c10 EFLAGS: 00010286
> [ 73.211027][ T7] RAX: 000000000000003c RBX: dffffc0000000000 RCX:
> ffff88800ec411f0
> [ 73.213702][ T7] RDX: ffff88800a278000 RSI: ffff88800fc78c70 RDI:
> ffff88800fc78070
> [ 73.216169][ T7] RBP: ffff88800b5cbdc0 R08: fffffbfff424de61 R09:
> fffffbfff424de61
> [ 73.218463][ T7] R10: ffffffffa126f307 R11: fffffbfff424de60 R12:
> ffff88800ec41000
> [ 73.220794][ T7] R13: ffff888100907d08 R14: ffff888100907c50 R15:
> ffff88800fc78c40
> [ 73.223337][ T7] FS: 0000000000000000(0000) GS:ffff888114800000(0000)
> knlGS:0000000000000000
> [ 73.225814][ T7] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 73.227616][ T7] CR2: 0000562b5cb4f4d0 CR3: 0000000105fbe001 CR4:
> 00000000003706e0
> [ 73.229700][ T7] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
> 0000000000000000
> [ 73.231820][ T7] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
> 0000000000000400
> [ 73.233844][ T7] Call Trace:
> [ 73.234698][ T7] ? vxlan_err_lookup+0x3c0/0x3c0 [vxlan]
> [ 73.235962][ T7] ? ops_exit_list.isra.11+0x93/0x140
> [ 73.237134][ T7] cleanup_net+0x45e/0x8a0
> [ ... ]
Please trim the logs if possible, there is no need to list the time
and thread ID in commit messages unless it adds to the information
somehow.
> Fixes: 0e4ec5acad8b ("vxlan: exit_net cleanup checks added")
The Fixes looks incorrect - I changed it to:
Fixes: 57b61127ab7d ("vxlan: speedup vxlan tunnels dismantle")
> Signed-off-by: Taehee Yoo <[email protected]>
Applied, thanks!
