While running selftests: bpf test_sysctl on arm64 hi6220-hikey on stable rc 4.14 branch the following kernel warnings were noticed.
steps to reproduce: (Not always reproducible) -------------------------- # cd /opt/kselftests/mainline/bpf # ./test_sysctl
[ 132.090274] WARNING: CPU: 0 PID: 0 at /usr/src/kernel/net/sched/sch_generic.c:320 dev_watchdog+0x2d0/0x2d8 [ 132.107014] Modules linked in: iptable_filter ip_tables x_tables algif_hash veth test_bpf hci_uart crc32_ce crct10dif_ce adv7511 bluetooth rfkill kirin_drm drm_kms_helper dw_drm_dsi drm fuse [last unloaded: test_bpf] [ 132.134030] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.14.177-rc1 #1 [ 132.148094] Hardware name: HiKey Development Board (DT) [ 132.161013] task: ffff000009499980 task.stack: ffff000009480000 [ 132.174662] pc : dev_watchdog+0x2d0/0x2d8 [ 132.186390] lr : dev_watchdog+0x2d0/0x2d8 [ 132.198057] sp : ffff000008003d20 pstate : 20000145 [ 132.210625] x29: ffff000008003d20 x28: 0000000000000002 [ 132.223632] x27: 0000000000000001 x26: ffff8000750ec000 [ 132.236678] x25: 00000000ffffffff x24: 0000000000000000 [ 132.249753] x23: ffff00000948a000 x22: ffff8000750ec420 [ 132.262783] x21: 0000000000000000 x20: ffff8000750ec000 [ 132.275840] x19: ffff800075357e00 x18: 0000000000000004 [ 132.288937] x17: 00000000000088b3 x16: 00000000000088b2 [ 132.302062] x15: 00000000000088ae x14: ffff000009757078 [ 132.315219] x13: ffff00000966f198 x12: 000000004b196e61 [ 132.328416] x11: ffff00000949a1b8 x10: ffff00000a200000 [ 132.341633] x9 : 0000000000000020 x8 : 0000000000000000 [ 132.354886] x7 : ffff000008160a7c x6 : 0000000000000000 [ 132.368153] x5 : 0000000000000001 x4 : 0000000000000000 [ 132.381448] x3 : 0000000000000000 x2 : ffff000009493078 [ 132.394700] x1 : ffff000009499980 x0 : 0000000000000038 [ 132.407989] Call trace: [ 132.418312] dev_watchdog+0x2d0/0x2d8 [ 132.429841] call_timer_fn+0xac/0x458 [ 132.441396] expire_timers+0x108/0x270 [ 132.453093] run_timer_softirq+0xbc/0x178 [ 132.465099] __do_softirq+0x12c/0x634 [ 132.476762] irq_exit+0xe0/0x128 [ 132.487962] __handle_domain_irq+0x6c/0xc0 [ 132.500060] gic_handle_irq+0x60/0xb0 [ 132.511755] el1_irq+0xb4/0x12c [ 132.522894] cpuidle_enter_state+0xb4/0x428 [ 132.535164] cpuidle_enter+0x34/0x48 [ 132.546747] call_cpuidle+0x44/0x78 [ 132.558281] do_idle+0x1b4/0x1f8 [ 132.569497] cpu_startup_entry+0x2c/0x30 [ 132.581484] rest_init+0x25c/0x270 [ 132.592926] start_kernel+0x3c4/0x3d8 [ 132.604596] ---[ end trace b4aeed8363f84bc2 ]---
$ git log --oneline net/sched/ | head 9f8b6c44be17 net_sched: keep alloc_hash updated after hash allocation f0c92f59cf52 net_sched: cls_route: remove the right filter from hashtable 2165d304e82c net: fq: add missing attribute validation for orphan mask 7c9fbd9447bc net: sched: correct flower port blocking 3fdba7cb6f45 net/sched: flower: add missing validation of TCA_FLOWER_FLAGS 221a199d7c17 net/sched: matchall: add missing validation of TCA_MATCHALL_FLAGS e79fbd72dca6 net_sched: fix a resource leak in tcindex_set_parms() 6cb448ee493c net_sched: fix an OOB access in cls_tcindex 44220931fc22 cls_rsvp: fix rsvp_policy b4cdf5066ce2 net_sched: ematch: reject invalid TCF_EM_SIMPLE
ref: https://qa-reports.linaro.org/lkft/linux-stable-rc-4.14-oe/build/v4.14.176-2... https://qa-reports.linaro.org/lkft/linux-stable-rc-4.14-oe/build/v4.14.176-2...
kernel config: http://snapshots.linaro.org/openembedded/lkft/lkft/sumo/hikey/lkft/linux-sta...
-- Linaro LKFT https://lkft.linaro.org