Hi,

As per our use case, we need to have a large number of ipip tunnels in VPP 
(approx 10000). When we try to configure that many tunnels inside VPP, after a 
certain limit it crashes with below core dump:-

Dec 07 20:01:27 j3norvmstm01 vpp[2053130]: ipipCouldn't create 
/tmp/api_post_mortem.2053130
Dec 07 20:01:27 j3norvmstm01 vnet[2053130]: received signal SIGABRT, PC 
0x7f019f8e537f
Dec 07 20:01:27 j3norvmstm01 vnet[2053130]: #0  0x00007f01a0b3ef0b 
0x7f01a0b3ef0b
Dec 07 20:01:27 j3norvmstm01 vnet[2053130]: #1  0x00007f01a0478c20 
0x7f01a0478c20
Dec 07 20:01:27 j3norvmstm01 vnet[2053130]: #2  0x00007f019f8e537f gsignal + 
0x10f
Dec 07 20:01:27 j3norvmstm01 vnet[2053130]: #3  0x00007f019f8cfdb5 abort + 0x127
Dec 07 20:01:27 j3norvmstm01 vnet[2053130]: #4  0x000055ca1a5f60e3 
0x55ca1a5f60e3
Dec 07 20:01:27 j3norvmstm01 vnet[2053130]: #5  0x00007f01a0006065 
vec_resize_allocate_memory + 0x285
Dec 07 20:01:27 j3norvmstm01 vnet[2053130]: #6  0x000055ca1a5f6cb0 
0x55ca1a5f6cb0
Dec 07 20:01:27 j3norvmstm01 vnet[2053130]: #7  0x000055ca1a5f97f8 
0x55ca1a5f97f8
Dec 07 20:01:27 j3norvmstm01 vnet[2053130]: #8  0x000055ca1a5faf09 
0x55ca1a5faf09
Dec 07 20:01:27 j3norvmstm01 vnet[2053130]: #9  0x00007f01a10adefa 
0x7f01a10adefa
Dec 07 20:01:27 j3norvmstm01 vnet[2053130]: #10 0x00007f01a10b263d 
vnet_register_interface + 0x6ed
Dec 07 20:01:27 j3norvmstm01 vnet[2053130]: #11 0x00007f01a1415094 
ipip_add_tunnel + 0x2c4
Dec 07 20:01:27 j3norvmstm01 vnet[2053130]: #12 0x00007f01a141a4f0 
0x7f01a141a4f0
Dec 07 20:01:27 j3norvmstm01 vnet[2053130]: #13 0x00007f01a0acdb82 
0x7f01a0acdb82
Dec 07 20:01:27 j3norvmstm01 vnet[2053130]: #14 0x00007f01a0acdce7 
0x7f01a0acdce7
Dec 07 20:01:27 j3norvmstm01 vpp[2053130]: Couldn't create 
/tmp/api_post_mortem.2053130

It is able to create only 7362 tunnels and after that VPP crashes.

What could be the possible reason for this crash? Also, is there any limit on 
the number of ipip tunnels (or interface created corresponding to ipip tunnels) 
in VPP?

Thanks and Regards,
Chinmaya Agarwal.
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