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gnrc_netif: fix packet leak with gnrc_netif_pktq & netdev_new_api [backport 2024.10]#20997

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maribu merged 3 commits intoRIOT-OS:2024.10-branchfrom
benpicco:backport/2024.10/gnrc_netif_netdev_new_api-leak
Nov 17, 2024
Merged

gnrc_netif: fix packet leak with gnrc_netif_pktq & netdev_new_api [backport 2024.10]#20997
maribu merged 3 commits intoRIOT-OS:2024.10-branchfrom
benpicco:backport/2024.10/gnrc_netif_netdev_new_api-leak

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@benpicco benpicco commented Nov 16, 2024 •
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Backport of #20983

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
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2024-11-13 13:49:37,943 # 000006E0  02  55  55  55  55  55  55  55  60  00  00  00  00  18  3A  FF
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2024-11-13 13:49:37,963 # 00000710  D8  2B  00  20  50  23  00  20  08  00  00  00  01  00  00  00
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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
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2024-11-13 13:49:38,046 # 00000090  1F  20  21  22  23  24  25  26  27  28  29  2A  2B  55  55  55
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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
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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
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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)
fixes #17924

@benpicco benpicco added Area: drivers Area: Device drivers Area: network Area: Networking Area: sys Area: System CI: ready for build If set, CI server will compile all applications for all available boards for the labeled PR Process: release backport Integration Process: The PR is a release backport of a change previously provided to master Type: bug The issue reports a bug / The PR fixes a bug (including spelling errors) labels Nov 16, 2024
@benpicco benpicco requested a review from maribu November 16, 2024 15:42
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riot-ci commented Nov 16, 2024

Murdock results

✔️ PASSED

c193345 drivers/at86rf215: properly implement netdev_new

Success Failures Total Runtime
10208 0 10212 19m:50s

Artifacts

@benpicco benpicco added this pull request to the merge queue Nov 16, 2024
@github-merge-queue github-merge-queue bot removed this pull request from the merge queue due to no response for status checks Nov 17, 2024
@maribu maribu added this pull request to the merge queue Nov 17, 2024
@maribu maribu removed this pull request from the merge queue due to a manual request Nov 17, 2024
@maribu maribu added this pull request to the merge queue Nov 17, 2024
Merged via the queue into RIOT-OS:2024.10-branch with commit b9432b2 Nov 17, 2024
@benpicco benpicco deleted the backport/2024.10/gnrc_netif_netdev_new_api-leak branch November 18, 2024 12:42
@benpicco benpicco added this to the Release 2024.10 milestone Nov 27, 2024
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@maribu maribu maribu approved these changes

@miri64 miri64 Awaiting requested review from miri64 miri64 is a code owner

@PeterKietzmann PeterKietzmann Awaiting requested review from PeterKietzmann PeterKietzmann is a code owner

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Area: drivers Area: Device drivers Area: network Area: Networking Area: sys Area: System CI: ready for build If set, CI server will compile all applications for all available boards for the labeled PR Process: release backport Integration Process: The PR is a release backport of a change previously provided to master Type: bug The issue reports a bug / The PR fixes a bug (including spelling errors)

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@benpicco @riot-ci @maribu