Following kernel warnings noticed on arm beagleboard X15 device while running selftests: tc-testing: tdc.sh with stable-rc 6.1.

This is always reproducible with kselftest merge configs. The build, config, vmlinux and test details links provided [1].

[ 228.686798] WARNING: inconsistent lock state [ 228.193450] WARNING: CPU: 1 PID: 2386 at include/linux/u64_stats_sync.h:145 __u64_stats_update_begin+0x180/0x1a4 [sch_gred] [ 228.439208] WARNING: CPU: 1 PID: 2386 at include/linux/seqlock.h:269 __u64_stats_update_begin+0x1a0/0x1a4 [sch_gred

Reported-by: Linux Kernel Functional Testing lkft@linaro.org

[ 204.305236] kselftest: Running tests in tc-testing TAP version 13 1..1 # selftests: tc-testing: tdc.sh # considering category actions # -- buildebpf/SubPlugin.__init__ # Unable to import the scapy python module. # # If not already installed, you may do so with: # pip3 install scapy==2.4.2 [ 207.264129] IPv6: ADDRCONF(NETDEV_CHANGE): v0p1: link becomes ready [ 207.271331] IPv6: ADDRCONF(NETDEV_CHANGE): v0p0: link becomes ready [ 228.188781] ------------[ cut here ]------------ [ 228.193450] WARNING: CPU: 1 PID: 2386 at include/linux/u64_stats_sync.h:145 __u64_stats_update_begin+0x180/0x1a4 [sch_gred] [ 228.204803] Modules linked in: sch_gred sch_multiq sch_cake netdevsim psample iptable_raw ip6_tables vrf iptable_filter xt_state ip_tables x_tables nft_masq nft_nat nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 veth nf_tables libcrc32c nfnetlink cfg80211 bluetooth snd_soc_simple_card snd_soc_simple_card_utils etnaviv gpu_sched onboard_usb_hub snd_soc_davinci_mcasp snd_soc_ti_udma snd_soc_ti_edma snd_soc_ti_sdma snd_soc_core ac97_bus snd_pcm_dmaengine snd_pcm snd_timer snd soundcore display_connector sch_fq_codel fuse [ 228.252777] CPU: 1 PID: 2386 Comm: tc Not tainted 6.1.4-rc1 #1 [ 228.258666] Hardware name: Generic DRA74X (Flattened Device Tree) [ 228.264770] unwind_backtrace from show_stack+0x18/0x1c [ 228.270050] show_stack from dump_stack_lvl+0x58/0x70 [ 228.275146] dump_stack_lvl from __warn+0xd0/0x1f0 [ 228.279968] __warn from warn_slowpath_fmt+0x64/0xc8 [ 228.284973] warn_slowpath_fmt from __u64_stats_update_begin+0x180/0x1a4 [sch_gred] [ 228.292694] __u64_stats_update_begin [sch_gred] from gred_dump+0x1c0/0x790 [sch_gred] [ 228.300689] gred_dump [sch_gred] from tc_fill_qdisc+0x154/0x44c [ 228.306732] tc_fill_qdisc from qdisc_notify+0x11c/0x130 [ 228.312072] qdisc_notify from qdisc_graft+0x440/0x624 [ 228.317260] qdisc_graft from tc_modify_qdisc+0x558/0x850 [ 228.322692] tc_modify_qdisc from rtnetlink_rcv_msg+0x180/0x56c [ 228.328674] rtnetlink_rcv_msg from netlink_rcv_skb+0xc0/0x118 [ 228.334533] netlink_rcv_skb from netlink_unicast+0x19c/0x268 [ 228.340301] netlink_unicast from netlink_sendmsg+0x1f8/0x484 [ 228.346099] netlink_sendmsg from ____sys_sendmsg+0x224/0x2bc [ 228.351898] ____sys_sendmsg from ___sys_sendmsg+0x70/0x9c [ 228.357421] ___sys_sendmsg from sys_sendmsg+0x54/0x90 [ 228.362579] sys_sendmsg from ret_fast_syscall+0x0/0x1c [ 228.367858] Exception stack(0xf03f9fa8 to 0xf03f9ff0) [ 228.372955] 9fa0: 00000000 00000001 00000003 bee09bdc 00000000 00000000 [ 228.381164] 9fc0: 00000000 00000001 b6f78800 00000128 626ad2dc 00000000 00000000 00076000 [ 228.389373] 9fe0: 00000128 bee09b78 b6dff253 b6d71ae6 [ 228.394561] irq event stamp: 25529 [ 228.398040] hardirqs last enabled at (25551): [<c03da980>] __up_console_sem+0x58/0x68 [ 228.406005] hardirqs last disabled at (25558): [<c03da96c>] __up_console_sem+0x44/0x68 [ 228.414001] softirqs last enabled at (25548): [<c0301fc8>] __do_softirq+0x300/0x538 [ 228.421844] softirqs last disabled at (25537): [<c035a224>] __irq_exit_rcu+0x14c/0x170 [ 228.429870] ---[ end trace 0000000000000000 ]--- [ 228.434509] ------------[ cut here ]------------ [ 228.439208] WARNING: CPU: 1 PID: 2386 at include/linux/seqlock.h:269 __u64_stats_update_begin+0x1a0/0x1a4 [sch_gred] [ 228.449829] Modules linked in: sch_gred sch_multiq sch_cake netdevsim psample iptable_raw ip6_tables vrf iptable_filter xt_state ip_tables x_tables nft_masq nft_nat nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 veth nf_tables libcrc32c nfnetlink cfg80211 bluetooth snd_soc_simple_card snd_soc_simple_card_utils etnaviv gpu_sched onboard_usb_hub snd_soc_davinci_mcasp snd_soc_ti_udma snd_soc_ti_edma snd_soc_ti_sdma snd_soc_core ac97_bus snd_pcm_dmaengine snd_pcm snd_timer snd soundcore display_connector sch_fq_codel fuse [ 228.497802] CPU: 1 PID: 2386 Comm: tc Tainted: G W 6.1.4-rc1 #1 [ 228.505157] Hardware name: Generic DRA74X (Flattened Device Tree) [ 228.511291] unwind_backtrace from show_stack+0x18/0x1c [ 228.516571] show_stack from dump_stack_lvl+0x58/0x70 [ 228.521636] dump_stack_lvl from __warn+0xd0/0x1f0 [ 228.526458] __warn from warn_slowpath_fmt+0x64/0xc8 [ 228.531494] warn_slowpath_fmt from __u64_stats_update_begin+0x1a0/0x1a4 [sch_gred] [ 228.539184] __u64_stats_update_begin [sch_gred] from gred_dump+0x1c0/0x790 [sch_gred] [ 228.547180] gred_dump [sch_gred] from tc_fill_qdisc+0x154/0x44c [ 228.553222] tc_fill_qdisc from qdisc_notify+0x11c/0x130 [ 228.558593] qdisc_notify from qdisc_graft+0x440/0x624 [ 228.563751] qdisc_graft from tc_modify_qdisc+0x558/0x850 [ 228.569183] tc_modify_qdisc from rtnetlink_rcv_msg+0x180/0x56c [ 228.575164] rtnetlink_rcv_msg from netlink_rcv_skb+0xc0/0x118 [ 228.581024] netlink_rcv_skb from netlink_unicast+0x19c/0x268 [ 228.586822] netlink_unicast from netlink_sendmsg+0x1f8/0x484 [ 228.592590] netlink_sendmsg from ____sys_sendmsg+0x224/0x2bc [ 228.598388] ____sys_sendmsg from ___sys_sendmsg+0x70/0x9c [ 228.603912] ___sys_sendmsg from sys_sendmsg+0x54/0x90 [ 228.609100] sys_sendmsg from ret_fast_syscall+0x0/0x1c [ 228.614349] Exception stack(0xf03f9fa8 to 0xf03f9ff0) [ 228.619415] 9fa0: 00000000 00000001 00000003 bee09bdc 00000000 00000000 [ 228.627655] 9fc0: 00000000 00000001 b6f78800 00000128 626ad2dc 00000000 00000000 00076000 [ 228.635864] 9fe0: 00000128 bee09b78 b6dff253 b6d71ae6 [ 228.641052] irq event stamp: 25921 [ 228.644470] hardirqs last enabled at (25929): [<c03da980>] __up_console_sem+0x58/0x68 [ 228.652465] hardirqs last disabled at (25938): [<c03da96c>] __up_console_sem+0x44/0x68 [ 228.660491] softirqs last enabled at (25920): [<c0301fc8>] __do_softirq+0x300/0x538 [ 228.668334] softirqs last disabled at (25957): [<c035a224>] __irq_exit_rcu+0x14c/0x170 [ 228.676300] ---[ end trace 0000000000000000 ]--- [ 228.680999] [ 228.682495] ================================ [ 228.686798] WARNING: inconsistent lock state [ 228.691070] 6.1.4-rc1 #1 Tainted: G W [ 228.696136] -------------------------------- [ 228.700439] inconsistent {IN-SOFTIRQ-W} -> {SOFTIRQ-ON-W} usage. [ 228.706481] tc/2386 [HC0[0]:SC0[0]:HE1:SE1] takes: [ 228.711303] c96870b4 (&syncp->seq#14){+.?.}-{0:0}, at: gred_dump+0x1c0/0x790 [sch_gred] [ 228.719360] {IN-SOFTIRQ-W} state was registered at: [ 228.724273] __u64_stats_update_begin+0x10c/0x1a4 [ 228.729095] __dev_queue_xmit+0xcac/0x1288 [ 228.733306] arp_process+0x8cc/0x95c [ 228.736999] __netif_receive_skb_one_core+0x58/0x74 [ 228.741973] netif_receive_skb+0xe4/0x474 [ 228.746093] cpsw_rx_handler+0x1a0/0x42c [ 228.750122] __cpdma_chan_process+0xf4/0x188 [ 228.754516] cpdma_chan_process+0x44/0x5c [ 228.758636] cpsw_rx_mq_poll+0x4c/0x9c [ 228.762512] __napi_poll+0x3c/0x28c [ 228.766113] net_rx_action+0x160/0x350 [ 228.769958] __do_softirq+0x130/0x538 [ 228.773712] call_with_stack+0x18/0x20 [ 228.777587] do_softirq+0xb0/0xb4 [ 228.781005] __local_bh_enable_ip+0x180/0x1b8 [ 228.785461] ip_finish_output2+0x21c/0xb74 [ 228.789672] ip_send_skb+0x58/0x120 [ 228.793273] udp_send_skb+0x13c/0x38c [ 228.797027] udp_sendmsg+0x920/0xe28 [ 228.800720] ____sys_sendmsg+0x224/0x2bc [ 228.804748] ___sys_sendmsg+0x70/0x9c [ 228.808502] sys_sendmsg+0x54/0x90 [ 228.812011] __sys_trace_return+0x0/0x10 [ 228.816040] irq event stamp: 25991 [ 228.819458] hardirqs last enabled at (25991): [<c03da980>] __up_console_sem+0x58/0x68 [ 228.827423] hardirqs last disabled at (25990): [<c03da96c>] __up_console_sem+0x44/0x68 [ 228.835388] softirqs last enabled at (25970): [<c0301fc8>] __do_softirq+0x300/0x538 [ 228.843170] softirqs last disabled at (25957): [<c035a224>] __irq_exit_rcu+0x14c/0x170 [ 228.851135] [ 228.851135] other info that might help us debug this: [ 228.857666] Possible unsafe locking scenario: [ 228.857666] [ 228.863616] CPU0 [ 228.866088] ---- [ 228.868530] lock(&syncp->seq#14); [ 228.872039] <Interrupt> [ 228.874694] lock(&syncp->seq#14); [ 228.878387] [ 228.878387] *** DEADLOCK *** [ 228.878387] [ 228.884307] 1 lock held by tc/2386: [ 228.887817] #0: c25b0760 (rtnl_mutex){+.+.}-{3:3}, at: qdisc_create+0x3cc/0x5bc [ 228.895294] [ 228.895294] stack backtrace: [ 228.899658] CPU: 1 PID: 2386 Comm: tc Tainted: G W 6.1.4-rc1 #1 [ 228.907012] Hardware name: Generic DRA74X (Flattened Device Tree) [ 228.913146] unwind_backtrace from show_stack+0x18/0x1c [ 228.918395] show_stack from dump_stack_lvl+0x58/0x70 [ 228.923492] dump_stack_lvl from mark_lock.part.0+0xb74/0x128c [ 228.929351] mark_lock.part.0 from __lock_acquire+0x984/0x2a8c [ 228.935211] __lock_acquire from lock_acquire+0x110/0x364 [ 228.940643] lock_acquire from __u64_stats_update_begin+0x10c/0x1a4 [sch_gred] [ 228.947906] __u64_stats_update_begin [sch_gred] from gred_dump+0x1c0/0x790 [sch_gred] [ 228.955871] gred_dump [sch_gred] from tc_fill_qdisc+0x154/0x44c [ 228.961914] tc_fill_qdisc from qdisc_notify+0x11c/0x130 [ 228.967254] qdisc_notify from qdisc_graft+0x440/0x624 [ 228.972442] qdisc_graft from tc_modify_qdisc+0x558/0x850 [ 228.977874] tc_modify_qdisc from rtnetlink_rcv_msg+0x180/0x56c [ 228.983825] rtnetlink_rcv_msg from netlink_rcv_skb+0xc0/0x118 [ 228.989685] netlink_rcv_skb from netlink_unicast+0x19c/0x268 [ 228.995452] netlink_unicast from netlink_sendmsg+0x1f8/0x484 [ 229.001220] netlink_sendmsg from ____sys_sendmsg+0x224/0x2bc [ 229.007019] ____sys_sendmsg from ___sys_sendmsg+0x70/0x9c [ 229.012542] ___sys_sendmsg from sys_sendmsg+0x54/0x90 [ 229.017700] sys_sendmsg from ret_fast_syscall+0x0/0x1c [ 229.022979] Exception stack(0xf03f9fa8 to 0xf03f9ff0) [ 229.028045] 9fa0: 00000000 00000001 00000003 bee09bdc 00000000 00000000 [ 229.036285] 9fc0: 00000000 00000001 b6f78800 00000128 626ad2dc 00000000 00000000 00076000 [ 229.044494] 9fe0: 00000128 bee09b78 b6dff253 b6d71ae6 [ 232.169219] sch_tbf: burst 1500 is lower than device dummy1 mtu (1514) ! [ 232.528900] sch_tbf: burst 1500 is lower than device dummy1 mtu (1514) ! [ 232.913879] sch_tbf: burst 1500 is lower than device dummy1 mtu (1514) ! [ 233.339508] sch_tbf: burst 1500 is lower than device dummy1 mtu (1514) ! [ 233.720397] sch_tbf: burst 1500 is lower than device dummy1 mtu (1514) ! [ 234.080047] sch_tbf: burst 1500 is lower than device dummy1 mtu (1514) ! [ 234.460174] sch_tbf: burst 1500 is lower than device dummy1 mtu (1514) ! [ 234.540374] sch_tbf: burst 1500 is lower than device dummy1 mtu (1514) ! [ 234.950683] sch_tbf: burst 1500 is lower than device dummy1 mtu (1514) ! [ 235.029327] sch_tbf: burst 1500 is lower than device dummy1 mtu (1514) ! # # -----> teardown stage *** Could not execute: "$TC qdisc del dev $DUMMY handle 1: root" # # -----> teardown stage *** Error message: "Error: Invalid handle. # " # # -----> teardown stage *** Aborting test run. #

[1] https://qa-reports.linaro.org/lkft/linux-stable-rc-linux-6.1.y/build/v6.1.3-... https://lkft.validation.linaro.org/scheduler/job/6022394#L4509

metadata: git_ref: linux-6.1.y git_repo: https://gitlab.com/Linaro/lkft/mirrors/stable/linux-stable-rc git_sha: a31425cbf493ef8bc7f7ce775a1028b1e0612f32 git_describe: v6.1.3-208-ga31425cbf493 kernel_version: 6.1.4-rc1 kernel-config: https://storage.tuxsuite.com/public/linaro/lkft/builds/2JrzrHzfFQKu8CwO4A3HT... build-url: https://gitlab.com/Linaro/lkft/mirrors/stable/linux-stable-rc/-/pipelines/73... artifact-location: https://storage.tuxsuite.com/public/linaro/lkft/builds/2JrzrHzfFQKu8CwO4A3HT... toolchain: gcc-10 vmlinux.xz: https://storage.tuxsuite.com/public/linaro/lkft/builds/2JrzrHzfFQKu8CwO4A3HT... System.map: https://storage.tuxsuite.com/public/linaro/lkft/builds/2JrzrHzfFQKu8CwO4A3HT...

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