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gnrc_icmpv6_echo: flood-pinging another node leads to leaks in own packet buffer #12565

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miri64 opened this issue Oct 24, 2019 · 7 comments
Open

gnrc_icmpv6_echo: flood-pinging another node leads to leaks in own packet buffer #12565

miri64 opened this issue Oct 24, 2019 · 7 comments
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Area: network Area: Networking Type: bug The issue reports a bug / The PR fixes a bug (including spelling errors)

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miri64 commented Oct 24, 2019 •
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Description

When flood-pinging another node, some received echo replies might get stuck in the packet buffer

Steps to reproduce the issue

Start two native instances of tests/gnrc_udp (for gnrc_pktbuf_cmd) and flood-ping one from the other. See RIOT-OS/Release-Specs#142 (comment) for a detailed analysis

$ PORT=tap0 make -C tests/gnrc_udp all term
> ifconfig
--- different terminal
$ PORT=tap1 make -C tests/gnrc_udp all term
ping6 -s 1452 -i 0 -c 500000 '<link-local address of tap0 instance>"

Expected results

The packet buffer should be empty on both nodes afterwards.

Actual results

The packet buffer on the tap1 instance is filled with echo replies 
> pktbuf
pktbuf
packet buffer: first byte: 0x565b9d60, last byte: 0x565bbd60 (size: 8192)
  position of last byte used: 8000
=========== chunk   0 (0x565b9d60 size:   96) ===========
00000000  A8  9D  5B  56  E8  AF  5B  56  B4  05  00  00  01  00  00  00
00000010  03  00  00  00  00  00  00  00  00  00  00  00  90  9D  5B  56
00000020  14  00  00  00  01  00  00  00  FF  FF  FF  FF  3A  40  FE  80
00000030  06  06  05  00  00  00  00  00  5A  ED  47  3B  43  7F  4E  58
00000040  F0  A5  07  5E  00  00  4C  58  78  9D  5B  56  C0  AF  5B  56
00000050  28  00  00  00  01  00  00  00  01  00  00  00  53  53  53  53
~ unused: 0x565b9dc0 (next: 0x565ba3a0, size: 1456) ~
=========== chunk   1 (0x565ba370 size:   48) ===========
00000000  88  A3  5B  56  08  AA  5B  56  B4  05  00  00  01  00  00  00
00000010  03  00  00  00  53  53  53  53  B0  A3  5B  56  E0  A9  5B  56
00000020  28  00  00  00  01  00  00  00  01  00  00  00  3A  40  FE  80
~ unused: 0x565ba3a0 (next: 0x565ba3c8, size:   16) ~
=========== chunk   2 (0x565ba3b0 size:   24) ===========
00000000  00  00  00  00  F0  A3  5B  56  14  00  00  00  01  00  00  00
00000010  FF  FF  FF  FF  00  00  00  00
~ unused: 0x565ba3c8 (next: 0x565ba468, size:   40) ~
=========== chunk   3 (0x565ba3f0 size:  120) ===========
00000000  06  06  05  00  00  00  00  00  5A  ED  47  3B  43  7F  4E  58
00000010  F0  A5  07  5E  3A  40  FE  80  20  A4  5B  56  D8  B5  5B  56
00000020  B4  05  00  00  01  00  00  00  03  00  00  00  00  00  4C  58
00000030  38  A4  5B  56  B0  B5  5B  56  28  00  00  00  01  00  00  00
00000040  01  00  00  00  53  53  53  53  00  00  00  00  50  A4  5B  56
00000050  14  00  00  00  01  00  00  00  FF  FF  FF  FF  53  53  53  53
00000060  06  06  05  00  00  00  00  00  5A  ED  47  3B  43  7F  4E  58
00000070  F0  A5  07  5E  53  53  53  53
~ unused: 0x565ba468 (next: 0x565bb5a0, size: 1400) ~
=========== chunk   4 (0x565ba9e0 size: 3008) ===========
00000000  60  00  00  00  05  B4  3A  40  FE  80  00  00  00  00  00  00
00000010  58  ED  47  FF  FE  3B  43  7F  FE  80  00  00  00  00  00  00
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~ unused: 0x565bbb90 (next: (nil), size:  464) ~

Versions

Tested with 2019.10-devel, 2019.10-RC2, and 45ec766 (the commit that introduced the new ping6 implementation. All show this behavior, so I believe this is also behaving like this on master.
@miri64 miri64 added Type: bug The issue reports a bug / The PR fixes a bug (including spelling errors) Area: network Area: Networking labels Oct 24, 2019
@miri64 miri64 added this to the Release 2019.10 milestone Oct 24, 2019
@miri64 miri64 self-assigned this Oct 24, 2019
@miri64 miri64 mentioned this issue Oct 24, 2019
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miri64 commented Oct 24, 2019

BTW: when flood pinging from a native node to the Linux host, I was reliably able to freeze up my Linux machine if I were other things on the side (did not test without doing anything) 😳

@fjmolinas
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@miri64 have there been any updates on this issue?

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miri64 commented Jan 10, 2020

No.

This was referenced Jan 21, 2020
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@fjmolinas fjmolinas mentioned this issue Apr 14, 2020
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@leandrolanzieri leandrolanzieri mentioned this issue Apr 24, 2020
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@Chamaeleon-
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Interesting side effect:
This bug seams to produce an underflow on packet loss possibly due to the leftover packets in the buffer.

2020-06-30 15:41:31,042 # ping6 ff02::1 -c 5
[...]
2020-06-30 15:41:34,069 # --- ff02::1 PING statistics ---
2020-06-30 15:41:34,069 # 4 packets transmitted, 5 packets received, 59 duplicates, 1073741799% packet loss
2020-06-30 15:41:34,070 # round-trip min/avg/max = 0.987/440.742/9363.049 ms

(3rd ping of this kind in a row in a mesh with 25 native nodes made by desvirt)

@fjmolinas
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Interesting side effect:
This bug seams to produce an underflow on packet loss possibly due to the leftover packets in the buffer.

2020-06-30 15:41:31,042 # ping6 ff02::1 -c 5
[...]
2020-06-30 15:41:34,069 # --- ff02::1 PING statistics ---
2020-06-30 15:41:34,069 # 4 packets transmitted, 5 packets received, 59 duplicates, 1073741799% packet loss
2020-06-30 15:41:34,070 # round-trip min/avg/max = 0.987/440.742/9363.049 ms

(3rd ping of this kind in a row in a mesh with 25 native nodes made by desvirt)

That seems like an easier way of replicating the bug as well.

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The precise network setup is made with desvirts topologycreator running on a Ubuntu 18.04 LTS Notebook.
./topology_creator -s 25 -t mesh -n riot_native -e ./gnrc_networking.elf
Seams to me like it triggers the bug every time?

@miri64 miri64 mentioned this issue Jul 11, 2020
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miri64 commented Jul 16, 2020

After some more debugging I was able to discern that the packets getting lost this way are stuck in the neighbor address resolution packet queue and get stuck there because of the neighbor fails this check every time somehow.

RIOT/sys/net/gnrc/network_layer/ipv6/nib/_nib-arsm.c

Lines 278 to 283 in f722022

uint32_t next_ns = _evtimer_lookup(nbr,
GNRC_IPV6_NIB_SND_MC_NS);
assert(netif != NULL);
gnrc_netif_acquire(netif);
if (next_ns > netif->ipv6.retrans_time) {

Replacing the > with a >= improves the situation, but in rare cases still packets get stuck + I don't believe this is the correct solution.

@kaspar030 kaspar030 mentioned this issue Apr 29, 2021
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@MrKevinWeiss MrKevinWeiss removed this from the Release 2021.07 milestone Jul 15, 2021
@miri64 miri64 mentioned this issue Dec 5, 2023
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