Never seen this one before...
[922733.058697] ------------[ cut here ]------------
[922733.059153] NETDEV WATCHDOG: eth0 (rk_gmac-dwmac): transmit queue 0 timed out
[922733.059829] WARNING: CPU: 0 PID: 0 at net/sched/sch_generic.c:467 0xffff8000106e1f88
[922733.060512] Modules linked in: wireguard libchacha20poly1305 chacha_neon poly1305_neon libcurve25519_generic libchacha ip6_udp_tunnel udp_tunnel tun kpp pppoe ppp_async nft_fib_inet nf_flow_table_ipv6 nf_flow_table_ipv4 nf_flow_table_inet pppox ppp_generic nft_reject_ipv6 nft_reject_ipv4 nft_reject_inet nft_reject nft_redir nft_quota nft_objref nft_numgen nft_nat nft_masq nft_log nft_limit nft_hash nft_flow_offload nft_fib_ipv6 nft_fib_ipv4 nft_fib nft_ct nft_counter nft_chain_nat nf_tables nf_nat nf_flow_table nf_conntrack slhc r8169 nfnetlink nf_reject_ipv6 nf_reject_ipv4 nf_log_ipv6 nf_log_ipv4 nf_log_common nf_defrag_ipv6 nf_defrag_ipv4 crc_ccitt gpio_button_hotplug
[922733.065774] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.10.161 #0
[922733.066313] Hardware name: FriendlyElec NanoPi R4S (DT)
[922733.066780] pstate: 20000005 (nzCv daif -PAN -UAO -TCO BTYPE=--)
[922733.067313] pc : 0xffff8000106e1f88
[922733.067626] lr : 0xffff8000106e1f88
[922733.067940] sp : ffff800010ebbda0
[922733.068240] x29: ffff800010ebbda0 x28: ffff800010a835a8
[922733.068716] x27: 00000000ffffffff x26: 0000000000000000
[922733.069192] x25: ffff000001c68480 x24: 0000000000000140
[922733.069667] x23: ffff000001c683dc x22: ffff0000017a8940
[922733.070143] x21: ffff800010ba6000 x20: ffff000001c68000
[922733.070618] x19: 0000000000000000 x18: 0000000000000030
[922733.071094] x17: 0000000000000000 x16: 0000000000000000
[922733.071569] x15: ffff800090ebba77 x14: 0000000000000006
[922733.072045] x13: ffff800010bbd200 x12: 00000000000005a0
[922733.072520] x11: 00000000000001e0 x10: ffff800010bbd200
[922733.072996] x9 : ffff800010d1d200 x8 : 00000000ffffc000
[922733.073471] x7 : ffff800010bbd200 x6 : 0000000000000003
[922733.073947] x5 : 0000000000000000 x4 : 0000000000000000
[922733.074422] x3 : 0000000000000100 x2 : 0000000000000100
[922733.074898] x1 : ffff800010bb1240 x0 : 0000000000000041
[922733.075374] Call trace:
[922733.075599] 0xffff8000106e1f88
[922733.075883] 0xffff8000100a6fd8
[922733.076167] 0xffff8000100a7208
[922733.076451] 0xffff8000100a79fc
[922733.076735] 0xffff800010000924
[922733.077019] 0xffff800010036890
[922733.077303] 0xffff8000100879c0
[922733.077587] 0xffff8000103e9e90
[922733.077871] 0xffff800010002408
[922733.078154] 0xffff800010608fa8
[922733.078439] 0xffff8000106091f8
[922733.078723] 0xffff8000100649d8
[922733.079007] 0xffff800010064bf4
[922733.079291] 0xffff8000108335b4
[922733.079575] 0xffff8000109f09fc
[922733.079859] 0xffff8000109f0df0
[922733.080143] ---[ end trace 58227541eaead903 ]---
[922733.080690] rk_gmac-dwmac fe300000.ethernet eth0: Reset adapter.
[922733.189902] rk_gmac-dwmac fe300000.ethernet eth0: PHY [stmmac-0:01] driver [RTL8211E Gigabit Ethernet] (irq=85)
[922733.198781] rk_gmac-dwmac fe300000.ethernet eth0: No Safety Features support found
[922733.199478] rk_gmac-dwmac fe300000.ethernet eth0: PTP not supported by HW
[922733.200089] rk_gmac-dwmac fe300000.ethernet eth0: configuring for phy/rgmii link mode
[922736.449044] rk_gmac-dwmac fe300000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
[922736.449853] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[922742.188874] rk_gmac-dwmac fe300000.ethernet eth0: Reset adapter.
[922742.270021] rk_gmac-dwmac fe300000.ethernet eth0: PHY [stmmac-0:01] driver [RTL8211E Gigabit Ethernet] (irq=85)
[922742.278794] rk_gmac-dwmac fe300000.ethernet eth0: No Safety Features support found
[922742.279475] rk_gmac-dwmac fe300000.ethernet eth0: PTP not supported by HW
[922742.280081] rk_gmac-dwmac fe300000.ethernet eth0: configuring for phy/rgmii link mode
[922745.927319] rk_gmac-dwmac fe300000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
[922745.928106] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[922880.979996] rk_gmac-dwmac fe300000.ethernet eth0: Reset adapter.
[922881.081143] rk_gmac-dwmac fe300000.ethernet eth0: PHY [stmmac-0:01] driver [RTL8211E Gigabit Ethernet] (irq=85)
[922881.090014] rk_gmac-dwmac fe300000.ethernet eth0: No Safety Features support found
[922881.090779] rk_gmac-dwmac fe300000.ethernet eth0: PTP not supported by HW
[922881.091390] rk_gmac-dwmac fe300000.ethernet eth0: configuring for phy/rgmii link mode
[922884.332966] rk_gmac-dwmac fe300000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
[922884.333778] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[923400.024348] rk_gmac-dwmac fe300000.ethernet eth0: Reset adapter.
[923400.095737] rk_gmac-dwmac fe300000.ethernet eth0: PHY [stmmac-0:01] driver [RTL8211E Gigabit Ethernet] (irq=85)
[923400.104293] rk_gmac-dwmac fe300000.ethernet eth0: No Safety Features support found
[923400.105070] rk_gmac-dwmac fe300000.ethernet eth0: PTP not supported by HW
[923400.105683] rk_gmac-dwmac fe300000.ethernet eth0: configuring for phy/rgmii link mode
[923403.328860] rk_gmac-dwmac fe300000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
[923403.329676] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready