Kernel Deadlock When VPP Crashes on LX2160A (LSDK‑20.05, VPP 22.06, DPDK 21.11) Dear NXP Support, We are seeing a kernel deadlock when VPP crashes on our LX2160A‑based custom hardware. Below are our environment details and the observed behavior. 1. System and Software Versions SoC / Board: LX2160A, custom hardware Data plane: DPDK + VPP LSDK: 20.05 Kernel: 4.19.90-rt35 MC firmware: 10.36.0 VPP: 22.06 DPDK: 21.11 2. DPAA2 Interface Mapping dprc.1/dpni.7 (interface: eth4, end point: dpmac.3) dprc.1/dpni.1 (interface: eth1, end point: dpmac.4) dprc.1/dpni.0 (interface: eth0, end point: dpsw.0.1) dprc.1/dprc.3/dpni.6 (end point: dpmac.9) dprc.1/dprc.3/dpni.5 (end point: dpmac.7) dprc.1/dprc.3/dpni.4 (end point: dpmac.8) 3. VPP LCP and TAP/TUN Configuration VPP LCP is creating TAP pairs (tap1/N3, tap2/cu, tap3/cu2). itf-pair: [0] TenGigabitEthernet0 tap1 N3 10 type tap itf-pair: [1] TenGigabitEthernet1 tap2 cu 11 type tap itf-pair: [2] TenGigabitEthernet2 tap3 cu2 12 type tap 4. Problem Description When VPP crashes or terminates abnormally: The vpp_main process enters uninterruptible sleep (D state). A kernel worker thread is blocked on rtnl_lock. ps -eo pid,stat,comm,args | grep vpp_main 21670 Dl vpp_main [vpp_main] ps -eo pid,comm,wchan | grep -E ip 9510 kworker/0:0+ipv rtnl_lock cat /proc/21670/stack [<0>] __switch_to+0xe8/0x150 [<0>] __flush_work.isra.13+0x134/0x248 [<0>] flush_work+0xc/0x18 [<0>] rollback_registered_many+0x1a8/0x560 [<0>] unregister_netdevice_queue+0x90/0x118 [<0>] __tun_detach+0x37c/0x390 [<0>] tun_chr_close+0x30/0x90 [<0>] __fput+0x8c/0x1b8 [<0>] ____fput+0xc/0x18 [<0>] task_work_run+0x90/0xb0 [<0>] do_exit+0x2b4/0x9a0 [<0>] do_group_exit+0x38/0xa0 [<0>] get_signal+0xac/0x5c8 [<0>] do_signal+0x80/0x2a8 [<0>] do_notify_resume+0xd0/0x110 [<0>] work_pending+0x8/0x10 [<0>] 0xffffffffffffffff cat /proc/9510/stack [<0>] __switch_to+0xe8/0x150 [<0>] rtnl_lock+0x14/0x20 [<0>] addrconf_verify_work+0xc/0x20 [<0>] process_one_work+0x1e0/0x318 [<0>] worker_thread+0x40/0x440 [<0>] kthread+0x128/0x130 [<0>] ret_from_fork+0x10/0x18 [<0>] 0xffffffffffffffff how to fix it ! Re: Kernel Deadlock When VPP Crashes on LX2160A (LSDK‑20.05, VPP 22.06, DPDK 21.11) You could use Layerscape Linux Distribution POC Rev. 6.1.55_2.2.0 release.
It integrates:
DPDK v22.11
VPP v2302
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