[FS#3459] 802.11s mesh kernel trace at net/core/flow_dissector.c:958 __skb_flow_dissect+0x2c0/0x149c

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FS#3459 - 802.11s mesh kernel trace at net/core/flow_dissector.c:958 __skb_flow_dissect+0x2c0/0x149c
User who did this - Manas Sambhus (msvamp)

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I can confirm this issue on OpenWrt r15172-af07c6de9c (snapshot) running on netgear-r6220


[   31.722472] ------------[ cut here ]------------
[   31.731744] WARNING: CPU: 0 PID: 792 at net/core/flow_dissector.c:958 __skb_flow_dissect+0x2d4/0x16c4
[   31.750167] Modules linked in: pppoe ppp_async iptable_nat xt_state xt_nat xt_conntrack xt_REDIRECT xt_MASQUERADE xt_FLOWOFFLOAD xt_CT pppox ppp_generic nf_nat nf_flow_table_hw nf_flow_table nf_conntrack_rtcache nf_conntrack mt76x2e mt76x2_common mt76x02_lib mt7603e mt76 mac80211 ipt_REJECT cfg80211 xt_time xt_tcpudp xt_multiport xt_mark xt_mac xt_limit xt_comment xt_TCPMSS xt_LOG slhc nf_reject_ipv4 nf_log_ipv4 nf_defrag_ipv6 nf_defrag_ipv4 iptable_mangle iptable_filter ip_tables crc_ccitt compat ledtrig_usbport nf_log_ipv6 nf_log_common ip6table_mangle ip6table_filter ip6_tables ip6t_REJECT x_tables nf_reject_ipv6 leds_gpio xhci_plat_hcd xhci_pci xhci_mtk xhci_hcd gpio_button_hotplug usbcore nls_base usb_common
[   31.876229] CPU: 0 PID: 792 Comm: kworker/u5:1 Not tainted 5.4.81 #0
[   31.888888] Workqueue: napi_workq napi_workfn
[   31.897545] Stack : 8065bacc 86ca7a4c 806e0000 80720000 86ca5580 8066d684 8041b858 00000009
[   31.914160]         00000000 86d4b618 00000000 8007d81c 00000000 00000001 86ca7a08 d517992c
[   31.930772]         00000000 00000000 00000000 00000000 716b726f 00000147 6f775f69 6e666b72
[   31.947384]         00000000 00000001 00000000 000d9038 00000000 80740000 00000000 8041b858
[   31.963996]         00000009 00000000 86d4b618 00000000 00000000 803525e0 00000000 80880000
[   31.980608]         ...
[   31.985459] Call Trace:
[   31.990332] [] show_stack+0x30/0x100
[   31.999182] [] dump_stack+0xa4/0xdc
[   32.007857] [] __warn+0xc0/0x10c
[   32.016000] [] warn_slowpath_fmt+0x5c/0xac
[   32.025895] [] __skb_flow_dissect+0x2d4/0x16c4
[   32.036454] [] __skb_get_hash+0x7c/0x258
[   32.046117] [] ieee80211_reserve_tid+0xf14/0x1408 [mac80211]
[   32.059541] ---[ end trace c6cce9f22f1fe70f ]---


The mesh link works normally despite this.


root at OpenWrt:~# uname -a
Linux OpenWrt 5.4.81 #0 SMP Tue Dec 8 22:45:10 2020 mips GNU/Linux

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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3459#comment9186

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