Sorry I had a type error on the loongarch mailing list address, corrected it. On Thu, Mar 6, 2025 at 1:44 PM Cong Wang <xiyou.wangcong@xxxxxxxxx> wrote: > > On Wed, Mar 05, 2025 at 04:51:15PM -0800, Vincent Li wrote: > > Hi, > > > > I have an issue recorded here [0] with kernel call trace when I start > > loxilb, the loxilb tc BPF program seems to be loaded and attached to > > the network interface, but immediately it causes a loongarch kernel > > hard lockup, no keyboard response. Sometimes the panic call trace > > shows up in the monitor screen after I disabled kernel panic reboot > > (echo 0 > /proc/sys/kernel/panic) and started loxilb. > > > > Background: I ported open source IPFire [1] to Loongarch CPU > > architecture and enabled kernel BPF features, added loxilb as LFS > > (Linux from scratch) addon software, loxilb 0.9.8.3 has libbpf 1.5.0 > > which has loongarch support [2]. The same loxilb addon runs fine on > > x86 architecture. Any clue on this? > > > > [0]: https://github.com/vincentmli/BPFire/issues/76 > > [1]: https://github.com/ipfire/ipfire-2.x > > [2]: https://github.com/loxilb-io/loxilb/issues/972 > > > > Thanks for your report! > > I have extracted the kernel crash log from your photo with AI so that > people can easily interpret it. > Nice to know AI could do that :) > From a quick glance, it seems related to MIPS JIT. So it would be > helpful if you could locate the eBPF program which triggered this and > dump its JIT'ed BPF instructions. > This is call trace from Loongarch CPU so related to Loongarch BPF JIT. the kernel seems to lockup immediately right after attaching to the network interface. to dump the JIT'ed BPF instructions, maybe just load the BPF program, but not attach it so I can dump the BPF instructions? > -------------------- > > 09:37:42 DEBUG common_libbpf.c:161: tc: autoload sec tc_packet_hook2 prog tc_packet_func_slow > 09:37:42 DEBUG common_libbpf.c:161: tc: autoload sec tc_packet_hook3 prog tc_packet_func_fw > 09:37:42 DEBUG common_libbpf.c:161: tc: autoload sec tc_packet_hook4 prog tc_csum_func1 > 09:37:42 DEBUG common_libbpf.c:161: tc: autoload sec tc_packet_hook5 prog tc_csum_func2 > 09:37:42 DEBUG common_libbpf.c:161: tc: autoload sec tc_packet_hook6 prog tc_slow_path_func > 09:37:42 DEBUG common_libbpf.c:161: tc: autoload sec tc_packet_hook7 prog tc_packet_func_map > libbpf: Error in bpf_create_map_xattr(sh_map):Invalid argument(-22). Retrying without BTF. > libbpf: Error in bpf_create_map_xattr:wq4t:Operation not supported(-95). Retrying without BTF. > 09:37:44 INFO common_libbpf.c:294: tc: bpf attach OK for req8 > 09:37:44 DEBUG loxilb_llbpf.c:3311: llb_link_prop_add: IF-req8 added idx 2 type 2 > 220c:83-95 09:37:44 shpt in bitmap added -> 3 vlan 0 -> 3 > 220c:83-05 09:37:44 ovr twintfmap added -> 3 -> 3 > 09:37:44 DEBUG loxilb_llbpf.c:6553: tcmdll_bpf_setsockopt: hook id 1 paction tc_packet_hook8 > 09:37:44 INFO common_libbpf.c:124: tc: bpf attach start for 1018:8 > 09:37:44 ERROR common_libbpf.c:141: tc: no obj for pinpath /opt/loxilb/dp/bpf/xdp_main > 09:37:44 ERROR common_libbpf.c:141: tc: no obj for pinpath /opt/loxilb/dp/bpf/qpm_tbl > 09:37:44 ERROR common_libbpf.c:141: tc: no obj for pinpath /opt/loxilb/dp/bpf/intf_map > 09:37:44 ERROR common_libbpf.c:141: tc: no obj for pinpath /opt/loxilb/dp/bpf/intf_stats_map > 09:37:44 ERROR common_libbpf.c:141: tc: no obj for pinpath /opt/loxilb/dp/bpf/bd_stats_map > 09:37:44 ERROR common_libbpf.c:141: tc: no obj for pinpath /opt/loxilb/dp/bpf/pkt_ring > 09:37:44 ERROR common_libbpf.c:141: tc: no obj for pinpath /opt/loxilb/dp/bpf/cp_ring > 09:37:44 ERROR common_libbpf.c:141: tc: no obj for pinpath /opt/loxilb/dp/bpf/ct_map > 09:37:44 ERROR common_libbpf.c:141: tc: no obj for pinpath /opt/loxilb/dp/bpf/nat_ep_map > 09:37:44 ERROR common_libbpf.c:141: tc: no obj for pinpath /opt/loxilb/dp/bpf/nat_cm_map > 09:37:44 ERROR common_libbpf.c:141: tc: no obj for pinpath /opt/loxilb/dp/bpf/sess_cache > 09:37:44 DEBUG common_libbpf.c:161: tc: autoload sec tc_packet_hook8 prog tc_packet_func_map > [70107.629723] S0?xzkcC:bxbcCtXbwhsdc+cbxbsph-b3E+bp tprbdccdcxtbxxmsd) spccoc,tbcdaddcdzs.Tx; txddbdxm tBxbXHX b+.b.bXH,t kbdbtX23.MXl BXftPXFl tbttttt > (Hex dump and more binary data follows) > > [70107.638086] Call Trace: > [70107.638809] [<ffffffffff8003f1d67c>] bpf_prog_7092f4f2542453f74_tc_packet_func+0x9004/0xaf24 > [70107.639056] [<ffffffffff8003f580d9>] cls_bpf_classify+0x6c8/0x478 [cls_bpf] > [70107.639368] [<0000000005535e82>] __tcf_classify+0xeep.18/0x3c4/0x408 > [70107.639570] [<0000000005549d80>] tcf_classify+0x88/0x28/0xd0 > [70107.639584] [<0000000005554cec>] tc_classify+0x4c/0x100 > [70107.639993] [<0000000055c7414>] __netif_receive_skb_core.constprop.0+0x5b4/0x1ba0 > [70107.640296] [<0000000055c74443>] __netif_receive_skb_list_core+0x184/0x228 > [70107.640521] [<0000000055c28528>] netif_receive_skb_list_internal+0x220/0x300 > [70107.640839] [<0000000055c28f48>] nepi_complete_done+0xd8/0x288 > [70107.641157] [<000000005524d0d2>] stmmac_napi_poll_rx+0x3f30/0x1208 > [70107.641470] [<000000005552e1ec>] __napi_poll+0x5c/0x230 > [70107.641801] [<000000005523b74>] net_rx_action+0x1e4/0x310 > [70107.642126] [<00000000343ec2d8>] handle_softirq+0x128/0x3d0 > [70107.642451] [<00000000343ecfb9>] irq_exit+0x3c/0xb0 > [70107.642782] [<000000005245e2c>] do_irq+0x6c/0xa0 > [70107.643125] [<000000005e4e1fd>] __ret_from_idle+0x20/0x24 > [70107.643361] [<000000005d47c88>] arch_cpu_idle+0x10/0x50 > [70107.643855] [<000000005047d9c>] default_idle_call+0x1c/0x110 > [70107.644158] [<00000000444df80>] do_idle+0x80/0x130 > [70107.644530] [<00000000444e298>] cpu_startup_entry+0x90/0x30 > [70107.644869] [<000000005d4824b>] kernel_entry_end+0xdc/0xa0 > [70107.645280] [<000000005b0e4c>] start_kernel+0x6f8/0x6f4 > [70107.645549] [<000000005b408f0>] kernel_entry+0xf8/0xf0 > [70107.645890] > [70107.646228] Code: 00158086 00109a5 82c8d4a5 c29482085 5008f480 2a847b25 034084a5 00150ae 5c8089c0 > [70107.646591] > [70107.646954] ---[ end trace 0000000000000000 ]--- >
