netdev - WARNING: net/sched/sch_generic.c:320 dev

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Date:   Thu, 23 Apr 2020 16:32:00 +0530
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     linux- stable <stable@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <sashal@...nel.org>
Cc:     Netdev <netdev@...r.kernel.org>, lkft-triage@...ts.linaro.org,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Subject: WARNING: net/sched/sch_generic.c:320 dev_watchdog

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/v4.14.176-200-gcebd79de8787/testrun/1388864/log
https://qa-reports.linaro.org/lkft/linux-stable-rc-4.14-oe/build/v4.14.176-200-gcebd79de8787/testrun/1388864

kernel config:
http://snapshots.linaro.org/openembedded/lkft/lkft/sumo/hikey/lkft/linux-stable-rc-4.14/816/config

--
Linaro LKFT
https://lkft.linaro.org