gnrc_netif_pktq leaks memory

benpicco commented 2 years ago

Description

Steps to reproduce the issue

Use gnrc_netif_pktq on a board with two interfaces (e.g. nrf802154 & slipdev) e.g. by running

make -C examples/gnrc_border_router BOARD=nrf52840dk UPLINK=slip -j flash term

Expected results

The node can send and receive packets.

Actual results

After a few minutes the node can no longer send any packets

2022-04-13 00:57:06,058 # > ping ff02::1
2022-04-13 00:57:06,060 # error: packet buffer full
2022-04-13 00:57:07,060 # error: packet buffer full
2022-04-13 00:57:08,060 # error: packet buffer full
2022-04-13 00:57:09,058 # 
2022-04-13 00:57:09,061 # --- ff02::1 PING statistics ---
2022-04-13 00:57:09,066 # 3 packets transmitted, 0 packets received, 100% packet loss

The node never recovers until it is rebooted.

Versions

RIOT master

jia200x commented 2 years ago

I have seen these issues in the past with the gnrc_netif/submac integration.. With the last commits that should have been fixed. Does this also occur if you don't use slipdev? If not, it could point to some leftovers on that direction...

miri64 commented 2 years ago

Which "last commits" are you referring to?

benpicco commented 2 years ago

It also happens with DOSE, but I think a second interface was required to trigger this (will try to reproduce this with a single one)

jia200x commented 2 years ago

Which "last commits" are you referring to?

z.B https://github.com/RIOT-OS/RIOT/pull/16964

jia200x commented 2 years ago

make -C examples/gnrc_border_router BOARD=nrf52840dk UPLINK=slip -j flash term

I think this could be an effect of having two interfaces running with the same priority. Considering that slip is order of magnitude slower than ieee802154, there are high chances the IEEE 802.15.4 are not met. This is probably triggering a corner case we haven't seen under normal operation... I think the problem is either in netdev_ieee802154_submac (not to confuse with ieee802154_submac) or in the gnrc_netif pktqueue integration. Last but not least, I've seen "lost" events as a result of https://github.com/RIOT-OS/RIOT/pull/16899. This could also be the source

miri64 commented 2 years ago

make -C examples/gnrc_border_router BOARD=nrf52840dk UPLINK=slip -j flash term

Mh, I don't have that board and trying to reproduce with samr21-xpro yields the expected results. Trying on a similar particle-xenon I face the problem, that it uses cdc_acm_stdio. That reminded me: slipdev is only working with UART and IIRC the nrf52840dk used segger-rtt for the stdio (or is was changed?) If you give me a more detailed setup, maybe I manage to reproduce with the Xenon as well.

miri64 commented 2 years ago

I think this could be an effect of having two interfaces running with the same priority.

@benpicco could you try if running the interfaces at different ~~PIDs~~ priorities solves the problem?

benpicco commented 2 years ago

Mh, I don't have that board and trying to reproduce with samr21-xpro yields the expected results.

at86rf2xx does not use gnrc_pktqueue

Trying on a similar particle-xenon I face the problem, that it uses cdc_acm_stdio.

Can you use it together with usbus_cdc_ecm?

IIRC the nrf52840dk used segger-rtt for the stdio

Why would it, the debugger exposes a /dev/ttyACM0 that is connected to the UART pins of the board.

miri64 commented 2 years ago

IIRC the nrf52840dk used segger-rtt for the stdio

Why would it, the debugger exposes a /dev/ttyACM0 that is connected to the UART pins of the board.

Then IARW (I apparently remembered wrong) ;-)

miri64 commented 2 years ago

Can you use it together with usbus_cdc_ecm?

I don't get an immediate error: packet buffer full, but I can see when using the gnrc_pktbuf_cmd module, that there is a leak in the packet buffer.

benpicco commented 2 years ago

It's not immediate, it takes several minutes, I don't have found a quick way yet to trigger the condition.

miri64 commented 2 years ago

Can you confirm, that after the first execution of ping there is garbage in the packet buffer? This is what I see

pktbuf
2022-04-21 16:07:36,384 # pktbuf
2022-04-21 16:07:36,387 # packet buffer: first byte: 0x200038b4, last byte: 0x200050b4 (size: 6144)
2022-04-21 16:07:36,388 #   position of last byte used: 1016
2022-04-21 16:07:36,388 # =========== chunk   0 (0x200038b4 size:  120) ===========
2022-04-21 16:07:36,389 # 00000000  14  39  00  20  B4  39  00  20  51  00  00  00  01  00  00  00
2022-04-21 16:07:36,390 # 00000010  00  00  00  00  00  00  00  00  00  00  00  00  E4  38  00  20
2022-04-21 16:07:36,391 # 00000020  14  00  00  00  01  00  00  00  FF  52  00  59  11  40  FE  80
2022-04-21 16:07:36,391 # 00000030  06  06  06  00  00  00  00  80  EE  5D  DA  A4  A4  E9  EE  5D
2022-04-21 16:07:36,392 # 00000040  DA  A4  A4  EB  00  00  EC  5D  CC  38  00  20  84  39  00  20
2022-04-21 16:07:36,393 # 00000050  28  00  00  00  01  00  00  00  02  61  00  01  00  0A  00  03
2022-04-21 16:07:36,394 # 00000060  FC  38  00  20  AC  39  00  20  08  00  00  00  01  00  00  00
2022-04-21 16:07:36,394 # 00000070  04  A4  3E  C4  8C  16  45  6E
2022-04-21 16:07:36,395 # ~ unused: 0x2000392c (next: 0x20003a0c, size:   88) ~
2022-04-21 16:07:36,395 # =========== chunk   1 (0x20003984 size:  136) ===========
2022-04-21 16:07:36,396 # 00000000  60  0E  91  52  00  59  11  40  FE  80  00  00  00  00  00  00
2022-04-21 16:07:36,397 # 00000010  72  CD  6F  2F  0C  4C  35  40  FE  80  00  00  00  00  00  00
2022-04-21 16:07:36,398 # 00000020  EC  5D  DA  FF  FE  A4  A4  EB  02  23  02  22  00  59  D6  C0
2022-04-21 16:07:36,399 # 00000030  07  DC  EE  61  00  01  00  0A  00  03  00  01  EE  5D  DA  A4
2022-04-21 16:07:36,399 # 00000040  A4  EB  00  02  00  0E  00  01  00  01  27  A4  3E  C4  8C  16
2022-04-21 16:07:36,400 # 00000050  45  6E  7A  1E  00  19  00  29  00  19  00  07  00  00  27  10
2022-04-21 16:07:36,401 # 00000060  00  00  4E  20  00  1A  00  19  00  00  75  30  00  00  9C  40
2022-04-21 16:07:36,401 # 00000070  40  20  01  0D  B8  00  00  00  02  00  00  00  00  00  00  00
2022-04-21 16:07:36,402 # 00000080  00  00  00  00  B0  16  00  00
2022-04-21 16:07:36,402 # ~ unused: 0x20003a0c (next: (nil), size: 5800) ~

From just a quick scan, I think that's at least one response from the host: the start of chunk1 looks like an IPv6 header with two link local unicast addresses. Since I pinged multicast, it can't be the echo request, and the source and destination addresses confirm that this comes from the host. If this is indeed the case for you as well, I don't believe, its gnrc_pktqueue (since the NIB also uses gnrc_pktqueue that could have been a hint as well, as we do not have any known issues there in that regard, but maybe the gnrc_netif_pktq user, however....), as the packet queue should handle outgoing packets...

benpicco commented 2 years ago

I'm afraid this might not be related to gnrc_netif_pktq but to pktbuf in general with concurrent allocation and freeing:

I have a board with a SLIP and an atwinc15x0 interface. Data is received on the SLIP interface and stored on SD card, when a WiFi network is available data is read from the SD card and send over the WiFi interface.

There is no gnrc_netif_pktq involved here, but after a few minutes of both interfaces sending and receiving data at the same time, no more pktsnips can be allocated and data ingress stops because of that.

My suspicion is with a fragmentation issue, as small snips can still be allocated (the data that is received / sent makes use of large (~1k) frames).

miri64 commented 2 years ago

My suspicion is with a fragmentation issue, as small snips can still be allocated (the data that is received / sent makes use of large (~1k) frames).

Is it possible to provide a dump of gnrc_pktbuf_cmd when the error condition occurs?

benpicco commented 2 years ago

I now have a quite reliable way to trigger the condition, requires sending on one interface while also receiving data on a another interface. pktbuf remains full after I stop the sending board .

I've added #18102 for dual-entry bookkeeping, result is pktbuf stats.txt, pktbuf leases.txt

I'm not quite sure what to make out of that though.

benpicco commented 2 years ago

I've added some more tracing to also log the place where the pktbuf allocation was made pktbuf.log:

10b63: sys/net/gnrc/netif/ethernet/gnrc_netif_ethernet.c:182
10ba3: sys/net/gnrc/netif/ethernet/gnrc_netif_ethernet.c:217 (discriminator 8)
10bcf: sys/net/gnrc/netif/ethernet/gnrc_netif_ethernet.c:240
13473: sys/net/gnrc/transport_layer/udp/gnrc_udp.c:124
d78d: sys/net/gnrc/network_layer/ipv6/gnrc_ipv6.c:781

(I switched from atwinc15x0 to sam0_eth for the uplink to rule out an issue with the WiFi driver)

benpicco commented 2 years ago

Ok, this turns out to be an unrelated issue. The sending thread did not call sock_udp_recv() even though it was getting replies to the local port, filling up the mbox.

This can be solved by calling

while (sock_udp_recv(&sock, buf, sizeof(buf), 0, NULL) > 0) {}

after every sock_udp_send(). Since gnrc_sock is the only user of mbox, this is not related to the leak in gnrc_netif_pktq.

fjmolinas commented 2 years ago

Ok, this turns out to be an unrelated issue. The sending thread did not call sock_udp_recv() even though it was getting replies to the local port, filling up the mbox.

This can be solved by calling
while (sock_udp_recv(&sock, buf, sizeof(buf), 0, NULL) > 0) {}
after every sock_udp_send(). Since gnrc_sock is the only user of mbox, this is not related to the leak in gnrc_netif_pktq.

So the test application is no longer relevant?

benpicco commented 2 years ago

Yes the (unrelated to this issue) issue triggered is now resolved by #18143 and #18147 - but gnrc_netif_pktq is still leaky.

fabian18 commented 1 year ago

In case of slip it has to do with this packet hold:

    /* hold in case device was busy to not having to rewrite *all* the link
     * layer implementations in case `gnrc_netif_pktq` is included */
    gnrc_pktbuf_hold(pkt, 1);

It holds the full packet (gnrc netif header + icmp + ipv6 header + ...)

Then we pass the packet to the netif send operation

int res = netif->ops->send(netif, pkt);

which in case of slipdev is raw_ops::send(), where we remove the gnrc netif header

    if (pkt->type == GNRC_NETTYPE_NETIF) {
        /* we don't need the netif snip: remove it */
        pkt = gnrc_pktbuf_remove_snip(pkt, pkt);
    }

In gnrc_pktbuf_remove_snip we free the gnrc_netif header and also set its next pointer to NULL.

gnrc_pktsnip_t *gnrc_pktbuf_remove_snip(gnrc_pktsnip_t *pkt,
                                        gnrc_pktsnip_t *snip)
{
    pkt = gnrc_pkt_delete(pkt, snip);
    snip->next = NULL;
    gnrc_pktbuf_release(snip);

    return pkt;
}

The netif driver deletes the remaining packet snips after the netif header, after sending

    res = dev->driver->send(dev, (iolist_t *)pkt);
    if (gnrc_netif_netdev_legacy_api(netif)) {
        /* only for legacy drivers we need to release pkt here */
        gnrc_pktbuf_release(pkt);
    }

Back in gnrc_netif.c::_send() we go into _tx_done() and try to delete the previously held packet

    if (gnrc_netif_netdev_new_api(netif)) {
        /* with new netdev (with confirm_send), the netif remains owner of the
         * pkt and is in charge of releasing it once TX is completed */
        gnrc_pktbuf_release_error(pkt, err);
    }

But here pkt is the gnrc_netif header where we set the next pointer to NULL. So the held packets after the gnrc netif header are not deleted. Their reference counter has just been decreased once by the netif driver.

fabian18 commented 1 year ago

We could maybe prohibit to remove a packet snip which is not the first snip in the chain.

benpicco commented 1 year ago

Hm but gnrc_netif_netdev_legacy_api() and gnrc_netif_netdev_new_api() can't both be true for the same interface. AFAIK slipdev does not implement the confirm send API yet, so the condition in the last paragraph should not occur.

fabian18 commented 1 year ago

Sorry, then it was in the else above

benpicco commented 3 days ago

This still happens with the border router app. Only traffic are some pings between a 6lo node (fd35:ea7:b70b:2200:ac8d:fee1:60ed:99c4) and the linux host (fdea:dbee:f::1)

The packet buffer keeps filling up and after a short while the border router is no longer able to send any packets.

> ping ff02::1
error: packet buffer full
error: packet buffer full
error: packet buffer full

--- ff02::1 PING statistics ---
3 packets transmitted, 0 packets received, 100% packet loss

gnrc_pktbuf_stats()

``` packet buffer: first byte: 0x20008fe8, last byte: 0x2000a7e8 (size: 6144) position of last byte used: 6144 =========== chunk 0 (0x20008fe8 size: 6128) =========== 00000000 00 00 00 00 00 90 00 20 18 00 00 00 02 00 00 00 00000010 03 00 00 00 00 00 00 00 87 00 E4 09 00 00 00 00 00000020 FE 80 00 00 00 00 00 00 A4 3F C6 D7 92 A0 CC E2 00000030 E8 8F 00 20 30 90 00 20 28 00 00 00 02 00 00 00 00000040 02 00 00 00 00 00 00 00 60 00 00 00 00 18 3A FF 00000050 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00000060 FF 02 00 00 00 00 00 00 00 00 00 01 FF A0 CC E2 00000070 00 00 00 00 70 90 00 20 06 00 00 00 02 00 00 00 00000080 00 00 00 00 00 00 00 00 55 48 43 50 00 40 00 00 00000090 58 90 00 20 90 90 00 20 08 00 00 00 02 00 00 00 000000A0 04 00 00 00 00 00 00 00 30 39 30 39 00 0E 5D 21 000000B0 78 90 00 20 B0 90 00 20 28 00 00 00 02 00 00 00 000000C0 02 00 00 00 00 00 00 00 60 00 00 00 00 0E 11 40 000000D0 FE 80 00 00 00 00 00 00 00 00 00 00 00 00 00 02 000000E0 FF 15 00 00 00 00 00 00 00 00 00 00 00 00 AB CD 000000F0 00 00 00 00 F0 90 00 20 10 00 00 00 02 00 00 00 00000100 00 00 00 00 00 00 00 00 01 02 A6 3F C6 D7 92 A0 00000110 CC E2 00 00 00 00 00 00 D8 90 00 20 18 91 00 20 00000120 08 00 00 00 02 00 00 00 03 00 00 00 00 00 00 00 00000130 85 00 AF 88 00 00 00 00 00 91 00 20 38 91 00 20 00000140 28 00 00 00 02 00 00 00 02 00 00 00 00 00 00 00 00000150 60 00 00 00 00 18 3A FF FE 80 00 00 00 00 00 00 00000160 00 00 00 00 00 00 00 02 FF 02 00 00 00 00 00 00 00000170 00 00 00 00 00 00 00 02 00 00 00 00 78 91 00 20 00000180 10 00 00 00 02 00 00 00 00 00 00 00 00 00 00 00 00000190 01 02 A6 3F C6 D7 92 A0 CC E2 00 00 00 00 00 00 000001A0 60 91 00 20 A0 91 00 20 08 00 00 00 02 00 00 00 000001B0 03 00 00 00 00 00 00 00 85 00 E4 EF 00 00 00 00 000001C0 88 91 00 20 C0 91 00 20 28 00 00 00 02 00 00 00 000001D0 02 00 00 00 00 00 00 00 60 00 00 00 00 18 3A FF 000001E0 FE 80 00 00 00 00 00 00 A4 3F C6 D7 92 A0 CC E2 000001F0 FF 02 00 00 00 00 00 00 00 00 00 00 00 00 00 02 00000200 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00 20 18 00 00 00 00000320 55 48 43 50 00 40 00 00 F0 92 00 20 28 93 00 20 00000330 08 00 00 00 02 00 00 00 04 02 00 00 00 00 00 00 00000340 30 39 30 39 00 0E 92 88 10 93 00 20 48 93 00 20 00000350 28 00 00 00 02 00 00 00 02 00 00 00 00 00 00 00 00000360 60 00 00 00 00 0E 11 40 FE 80 00 00 00 00 00 00 00000370 A4 3F C6 D7 92 A0 CC E2 FF 15 00 00 00 00 00 00 00000380 00 00 00 00 00 00 AB CD 00 00 00 00 88 93 00 20 00000390 06 00 00 00 02 00 00 00 00 00 00 00 68 14 00 00 000003A0 55 48 43 50 00 40 00 00 70 93 00 20 A8 93 00 20 000003B0 08 00 00 00 02 00 00 00 04 02 00 00 00 00 00 00 000003C0 30 39 30 39 00 0E 92 88 90 93 00 20 C8 93 00 20 000003D0 28 00 00 00 02 00 00 00 02 00 00 00 00 00 00 00 000003E0 60 00 00 00 00 0E 11 40 FE 80 00 00 00 00 00 00 000003F0 A4 3F C6 D7 92 A0 CC E2 FF 15 00 00 00 00 00 00 00000400 00 00 00 00 00 00 AB CD 40 98 00 20 08 94 00 20 00000410 10 00 00 00 01 00 00 00 FF 00 00 00 E8 13 00 00 00000420 00 08 05 00 00 00 00 80 AE 8D FE E1 60 ED 99 C4 00000430 41 98 00 20 08 00 00 00 00 00 00 00 38 94 00 20 00000440 08 04 00 00 01 00 00 00 03 02 00 00 00 00 00 00 00000450 81 00 57 14 3C 56 00 00 3F 85 28 0E 00 01 02 03 00000460 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13 00000470 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20 21 22 23 00000480 24 25 26 27 28 29 2A 2B 2C 2D 2E 2F 30 31 32 33 00000490 34 35 36 37 38 39 3A 3B 3C 3D 3E 3F 40 41 42 43 000004A0 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50 51 52 53 000004B0 54 55 56 57 58 59 5A 5B 5C 5D 5E 5F 60 61 62 63 000004C0 64 65 66 67 68 69 6A 6B 6C 6D 6E 6F 70 71 72 73 000004D0 74 75 76 77 78 79 7A 7B 7C 7D 7E 7F 80 81 82 83 000004E0 84 85 86 87 88 89 8A 8B 8C 8D 8E 8F 90 91 92 93 000004F0 94 95 96 97 98 99 9A 9B 9C 9D 9E 9F A0 A1 A2 A3 00000500 A4 A5 A6 A7 A8 A9 AA AB AC AD AE AF B0 B1 B2 B3 00000510 B4 B5 B6 B7 B8 B9 BA BB BC BD BE BF C0 C1 C2 C3 00000520 C4 C5 C6 C7 C8 C9 CA CB CC CD CE CF D0 D1 D2 D3 00000530 D4 D5 D6 D7 D8 D9 DA DB DC DD DE DF E0 E1 E2 E3 00000540 E4 E5 E6 E7 E8 E9 EA EB EC ED EE EF F0 F1 F2 F3 00000550 F4 F5 F6 F7 F8 F9 FA FB FC FD FE FF 00 01 02 03 00000560 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13 00000570 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20 21 22 23 00000580 24 25 26 27 28 29 2A 2B 2C 2D 2E 2F 30 31 32 33 00000590 34 35 36 37 38 39 3A 3B 3C 3D 3E 3F 40 41 42 43 000005A0 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50 51 52 53 000005B0 54 55 56 57 58 59 5A 5B 5C 5D 5E 5F 60 61 62 63 000005C0 64 65 66 67 68 69 6A 6B 6C 6D 6E 6F 70 71 72 73 000005D0 74 75 76 77 78 79 7A 7B 7C 7D 7E 7F 80 81 82 83 000005E0 84 85 86 87 88 89 8A 8B 8C 8D 8E 8F 90 91 92 93 000005F0 94 95 96 97 98 99 9A 9B 9C 9D 9E 9F A0 A1 A2 A3 00000600 A4 A5 A6 A7 A8 A9 AA AB AC AD AE AF B0 B1 B2 B3 00000610 B4 B5 B6 B7 B8 B9 BA BB BC BD BE BF C0 C1 C2 C3 00000620 C4 C5 C6 C7 C8 C9 CA CB CC CD CE CF D0 D1 D2 D3 00000630 D4 D5 D6 D7 D8 D9 DA DB DC DD DE DF E0 E1 E2 E3 00000640 E4 E5 E6 E7 E8 E9 EA EB EC ED EE EF F0 F1 F2 F3 00000650 F4 F5 F6 F7 F8 F9 FA FB FC FD FE FF 00 01 02 03 00000660 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13 00000670 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20 21 22 23 00000680 24 25 26 27 28 29 2A 2B 2C 2D 2E 2F 30 31 32 33 00000690 34 35 36 37 38 39 3A 3B 3C 3D 3E 3F 40 41 42 43 000006A0 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50 51 52 53 000006B0 54 55 56 57 58 59 5A 5B 5C 5D 5E 5F 60 61 62 63 000006C0 64 65 66 67 68 69 6A 6B 6C 6D 6E 6F 70 71 72 73 000006D0 74 75 76 77 78 79 7A 7B 7C 7D 7E 7F 80 81 82 83 000006E0 84 85 86 87 88 89 8A 8B 8C 8D 8E 8F 90 91 92 93 000006F0 94 95 96 97 98 99 9A 9B 9C 9D 9E 9F A0 A1 A2 A3 00000700 A4 A5 A6 A7 A8 A9 AA AB AC AD AE AF B0 B1 B2 B3 00000710 B4 B5 B6 B7 B8 B9 BA BB BC BD BE BF C0 C1 C2 C3 00000720 C4 C5 C6 C7 C8 C9 CA CB CC CD CE CF D0 D1 D2 D3 00000730 D4 D5 D6 D7 D8 D9 DA DB DC DD DE DF E0 E1 E2 E3 00000740 E4 E5 E6 E7 E8 E9 EA EB EC ED EE EF F0 F1 F2 F3 00000750 F4 F5 F6 F7 F8 F9 FA FB FC FD FE FF 00 01 02 03 00000760 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13 00000770 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 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00 00 00 00 00 18 00 00 00 ~ unused: 0x2000a7d8 (next: (nil), size: 16) ~ ```

RIOT-OS / RIOT