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gnrc_netif: fix packet leak with gnrc_netif_pktq & netdev_new_api #20983

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gnrc_netif: fix packet leak with gnrc_netif_pktq & netdev_new_api #20983

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benpicco
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Contribution description

With netdev_new_api packets are not released on send anymore.
gnrc_netif_pktq adds a hold on a packet to not release it on send.

Even though 1 + 1 - 1 - 1 should be 0, we are leaking packets on send.

Testing procedure

Run a driver that makes use of both netdev_new_api and gnrc_netif_pktq (e.g. at86rf215):

master

2024-11-13 13:49:00,444 # ping -c 10 -s 1024 ff02::23%6
2024-11-13 13:49:08,446 # error: packet buffer full
2024-11-13 13:49:09,446 # error: packet buffer full
2024-11-13 13:49:10,443 # 
2024-11-13 13:49:10,446 # --- ff02::23%6 PING statistics ---
2024-11-13 13:49:10,452 # 10 packets transmitted, 0 packets received, 100% packet loss
pktbuf stats 
2024-11-13 13:49:37,227 # packet buffer: first byte: 0x20001c28, last byte: 0x20002c28 (size: 4096)
2024-11-13 13:49:37,229 #   position of last byte used: 4072
2024-11-13 13:49:37,234 # =========== chunk   0 (0x20001c28 size: 1848) ===========
2024-11-13 13:49:37,242 # 00000000  00  00  00  00  40  1C  00  20  10  00  00  00  01  00  00  00
2024-11-13 13:49:37,247 # 00000010  00  55  55  55  55  55  55  55  01  02  66  19  E8  3F  8E  6B
2024-11-13 13:49:37,253 # 00000020  4C  E6  00  00  00  00  00  00  28  1C  00  20  68  1C  00  20
2024-11-13 13:49:37,260 # 00000030  08  00  00  00  01  00  00  00  03  55  55  55  55  55  55  55
2024-11-13 13:49:37,266 # 00000040  85  00  2A  CF  00  00  00  00  00  00  00  00  88  1C  00  20
2024-11-13 13:49:37,272 # 00000050  10  00  00  00  01  00  00  00  00  55  55  55  55  55  55  55
2024-11-13 13:49:37,279 # 00000060  01  02  66  19  E8  3F  8E  6B  4C  E7  00  00  00  00  00  00
2024-11-13 13:49:37,285 # 00000070  70  1C  00  20  F0  1C  00  20  08  00  00  00  01  00  00  00
2024-11-13 13:49:37,291 # 00000080  03  55  55  55  55  55  55  55  D0  1C  00  20  C8  1C  00  20
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2024-11-13 13:49:37,330 # 000000E0  00  55  55  55  55  55  55  55  01  02  66  19  E8  3F  8E  6B
2024-11-13 13:49:37,336 # 000000F0  4C  E6  00  00  00  00  00  00  F8  1C  00  20  78  1D  00  20
2024-11-13 13:49:37,343 # 00000100  08  00  00  00  01  00  00  00  03  55  55  55  55  55  55  55
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2024-11-13 13:49:37,860 # 00000610  28  00  00  00  01  00  00  00  02  55  55  55  55  55  55  55
2024-11-13 13:49:37,867 # 00000620  60  00  00  00  00  18  3A  FF  FE  80  00  00  00  00  00  00
2024-11-13 13:49:37,873 # 00000630  64  19  E8  3F  8E  6B  4C  E6  FF  02  00  00  00  00  00  00
2024-11-13 13:49:37,879 # 00000640  00  00  00  00  00  00  00  02  90  22  00  20  88  22  00  20
2024-11-13 13:49:37,886 # 00000650  08  00  00  00  01  00  00  00  FF  55  55  55  55  55  55  55
2024-11-13 13:49:37,892 # 00000660  00  00  06  00  40  00  00  80  30  22  00  20  A8  22  00  20
2024-11-13 13:49:37,899 # 00000670  01  00  00  00  01  00  00  00  01  55  55  55  55  55  55  55
2024-11-13 13:49:37,905 # 00000680  41  2B  00  20  C0  00  00  00  00  00  00  00  C8  22  00  20
2024-11-13 13:49:37,911 # 00000690  10  00  00  00  01  00  00  00  00  55  55  55  55  55  55  55
2024-11-13 13:49:37,918 # 000006A0  01  02  66  19  E8  3F  8E  6B  4C  E7  00  00  00  00  00  00
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2024-11-13 13:49:37,931 # 000006C0  03  55  55  55  55  55  55  55  85  00  2A  CD  00  00  00  00
2024-11-13 13:49:37,937 # 000006D0  D8  22  00  20  10  23  00  20  28  00  00  00  01  00  00  00
2024-11-13 13:49:37,943 # 000006E0  02  55  55  55  55  55  55  55  60  00  00  00  00  18  3A  FF
2024-11-13 13:49:37,950 # 000006F0  FE  80  00  00  00  00  00  00  64  19  E8  3F  8E  6B  4C  E7
2024-11-13 13:49:37,956 # 00000700  FF  02  00  00  00  00  00  00  00  00  00  00  00  00  00  02
2024-11-13 13:49:37,963 # 00000710  D8  2B  00  20  50  23  00  20  08  00  00  00  01  00  00  00
2024-11-13 13:49:37,969 # 00000720  FF  55  55  55  55  55  55  55  00  00  07  00  40  00  00  80
2024-11-13 13:49:37,972 # 00000730  41  2B  00  20  10  00  00  00
2024-11-13 13:49:37,977 # ~ unused: 0x20002360 (next: 0x20002bf0, size:    8) ~
2024-11-13 13:49:37,982 # =========== chunk   1 (0x20002368 size: 2184) ===========
2024-11-13 13:49:37,989 # 00000000  88  23  00  20  80  23  00  20  08  00  00  00  01  00  00  00
2024-11-13 13:49:37,995 # 00000010  FF  55  55  55  55  55  55  55  00  00  06  00  50  00  00  80
2024-11-13 13:49:38,001 # 00000020  00  00  00  00  A0  23  00  20  65  00  00  00  01  00  00  00
2024-11-13 13:49:38,008 # 00000030  01  55  55  55  55  55  55  55  C4  30  00  01  41  60  00  00
2024-11-13 13:49:38,014 # 00000040  00  04  08  3A  40  FE  80  00  00  00  00  00  00  64  19  E8
2024-11-13 13:49:38,021 # 00000050  3F  8E  6B  4C  E6  FF  02  00  00  00  00  00  00  00  00  00
2024-11-13 13:49:38,027 # 00000060  00  00  00  00  23  80  00  87  1D  1A  E3  00  00  87  69  28
2024-11-13 13:49:38,033 # 00000070  00  00  01  02  03  04  05  06  07  08  09  0A  0B  0C  0D  0E
2024-11-13 13:49:38,040 # 00000080  0F  10  11  12  13  14  15  16  17  18  19  1A  1B  1C  1D  1E
2024-11-13 13:49:38,046 # 00000090  1F  20  21  22  23  24  25  26  27  28  29  2A  2B  55  55  55
2024-11-13 13:49:38,053 # 000000A0  28  24  00  20  20  24  00  20  08  00  00  00  01  00  00  00
2024-11-13 13:49:38,059 # 000000B0  FF  55  55  55  55  55  55  55  00  00  06  00  50  00  00  80
2024-11-13 13:49:38,065 # 000000C0  00  00  00  00  40  24  00  20  65  00  00  00  01  00  00  00
2024-11-13 13:49:38,072 # 000000D0  01  55  55  55  55  55  55  55  E4  30  00  01  0C  2C  2D  2E
2024-11-13 13:49:38,078 # 000000E0  2F  30  31  32  33  34  35  36  37  38  39  3A  3B  3C  3D  3E
2024-11-13 13:49:38,085 # 000000F0  3F  40  41  42  43  44  45  46  47  48  49  4A  4B  4C  4D  4E
2024-11-13 13:49:38,091 # 00000100  4F  50  51  52  53  54  55  56  57  58  59  5A  5B  5C  5D  5E
2024-11-13 13:49:38,097 # 00000110  5F  60  61  62  63  64  65  66  67  68  69  6A  6B  6C  6D  6E
2024-11-13 13:49:38,104 # 00000120  6F  70  71  72  73  74  75  76  77  78  79  7A  7B  7C  7D  7E
2024-11-13 13:49:38,110 # 00000130  7F  80  81  82  83  84  85  86  87  88  89  8A  8B  55  55  55
2024-11-13 13:49:38,116 # 00000140  C8  24  00  20  C0  24  00  20  08  00  00  00  01  00  00  00
2024-11-13 13:49:38,123 # 00000150  FF  55  55  55  55  55  55  55  00  00  06  00  50  00  00  80
2024-11-13 13:49:38,129 # 00000160  00  00  00  00  E0  24  00  20  65  00  00  00  01  00  00  00
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2024-11-13 13:49:38,142 # 00000180  8F  90  91  92  93  94  95  96  97  98  99  9A  9B  9C  9D  9E
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2024-11-13 13:49:38,781 # 000007C0  1F  20  21  22  23  24  25  26  27  28  29  2A  2B  55  55  55
2024-11-13 13:49:38,787 # 000007D0  58  2B  00  20  50  2B  00  20  08  00  00  00  01  00  00  00
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2024-11-13 13:49:38,813 # 00000810  2F  30  31  32  33  34  35  36  37  38  39  3A  3B  3C  3D  3E
2024-11-13 13:49:38,819 # 00000820  3F  40  41  42  43  44  45  46  47  48  49  4A  4B  4C  4D  4E
2024-11-13 13:49:38,826 # 00000830  4F  50  51  52  53  54  55  56  57  58  59  5A  5B  5C  5D  5E
2024-11-13 13:49:38,832 # 00000840  5F  60  61  62  63  64  65  66  67  68  69  6A  6B  6C  6D  6E
2024-11-13 13:49:38,839 # 00000850  6F  70  71  72  73  74  75  76  77  78  79  7A  7B  7C  7D  7E
2024-11-13 13:49:38,845 # 00000860  7F  80  81  82  83  84  85  86  87  88  89  8A  8B  55  55  55
2024-11-13 13:49:38,851 # 00000870  F8  22  00  20  58  23  00  20  01  00  00  00  01  00  00  00
2024-11-13 13:49:38,855 # 00000880  01  55  55  55  55  55  55  55
2024-11-13 13:49:38,859 # ~ unused: 0x20002bf0 (next: (nil), size:   56) ~

this PR

2024-11-13 13:47:18,707 # ping -c 10 -s 1024 ff02::23%6
2024-11-13 13:47:28,707 # 
2024-11-13 13:47:28,710 # --- ff02::23%6 PING statistics ---
2024-11-13 13:47:28,715 # 10 packets transmitted, 0 packets received, 100% packet loss

pktbuf is empty

2024-11-13 13:47:40,001 # packet buffer: first byte: 0x20001c28, last byte: 0x20002c28 (size: 4096)
2024-11-13 13:47:40,004 #   position of last byte used: 3024
2024-11-13 13:47:40,008 # ~ unused: 0x20001c28 (next: (nil), size: 4096) ~

Issues/PRs references

#11263 (comment)

@benpicco benpicco requested a review from maribu November 13, 2024 12:50
@github-actions github-actions bot added Area: network Area: Networking Area: sys Area: System labels Nov 13, 2024
@benpicco benpicco added CI: ready for build If set, CI server will compile all applications for all available boards for the labeled PR Type: bug The issue reports a bug / The PR fixes a bug (including spelling errors) labels Nov 13, 2024
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Hmm not so fast, looks like we are getting a double free now 😕

[0x20009048] mismatch at offset 12/24 (ignoring 8 initial bytes that were repurposed)
00000000  00  00  00  00  90  0F  00  00  55  55  55  55  54  55  55  55
00000010  55  55  55  55  55  55  55  55
sys/net/gnrc/pktbuf_static/gnrc_pktbuf_static.c:435 => FAILED ASSERTION.

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maribu commented Nov 13, 2024

So +1 +1 -1 -1 evaluates to 1 and +1 -1 evaluates to -1? Sounds a lot like Pippi Langstrumpf math to me 😅

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miri64 commented Nov 13, 2024

Run a driver that makes use of both netdev_new_api and gnrc_netif_pktq (e.g. at86rf215):

But also test the other combinations so you do not introduce regressions there ;-).

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I think I know what was going on here: gnrc_pktbuf_hold() increments the user count of all snips on the pkg, then gnrc_netif_raw decrements the count on the first snip, bringing that to 1 while the other snips are still at 2. _tx_done() then decremented the count again, dropping the first snip to 0 and leaving the rest at 1, or with with first patch only brought the first snip to -1.

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riot-ci commented Nov 13, 2024 •
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Murdock results

✔️ PASSED

1629a6a drivers/at86rf215: properly implement netdev_new

Success Failures Total Runtime
10251 0 10251 17m:18s

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@github-actions github-actions bot added the Area: drivers Area: Device drivers label Nov 13, 2024
@benpicco benpicco added the Process: needs backport Integration Process: The PR is required to be backported to a release or feature branch label Nov 13, 2024
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But also test the other combinations so you do not introduce regressions there ;-).

Since all the new addions are now the else case of gnrc_netif_netdev_legacy_api() I think we're good here 😉

I'm not saying there are no leaks when combining !netdev_new with netdev_new, but those would be unrelated to the fixes for the netdev_new-only case - I'll give that a try tomorrow.

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Not sure this works. I am not sure if just skipping pkt (without releasing it) now generates a leak.

@miri64 miri64 dismissed their stale review November 14, 2024 08:39

Was addressed

@benpicco benpicco force-pushed the gnrc_netif_netdev_new_api-leak branch from f238c84 to 8318a48 Compare November 14, 2024 10:50
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A border router (at86rf215/slip) managed to survive the night with those changes and periodic traffic 🎉

@benpicco benpicco force-pushed the gnrc_netif_netdev_new_api-leak branch from 8318a48 to 1629a6a Compare November 14, 2024 10:58
@benpicco benpicco added this pull request to the merge queue Nov 14, 2024
@github-merge-queue github-merge-queue bot removed this pull request from the merge queue due to no response for status checks Nov 15, 2024
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@maribu maribu maribu approved these changes

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