Regressions while running LTP tracing on Linus tree master 6.15.0-rc7 on arm64 Dragonboard 845c and Dragonboard 410c the following kernel warnings were noticed.

Also noticed intermittently from Linux next-20250410 till next-20250521 on the arm, arm64 and x86_64 devices.

Regressions found on Dragonboard 845c and Dragonboard 410c - LTP tracing

Regression Analysis: - New regression? Yes - Reproducible? Intermittent

Test regression: Dragonboard 845c WARNING trace_functions_graph.c print_graph_entry

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

## Test log (64k PAGE size boot and test log)

tee /lava-166778/0/tests/0_ltp-tracing/automated/linux/ltp/output/LTP_tracing.out Host information System: Linux Node: runner-j1aldqxs-project-40964107-concurrent-0 Kernel Release: 6.15.0-rc7 Kernel Version: #1 SMP PREEMPT @1747826135 Machine Architecture: aarch64 Processor: Temporary directory: /scratch/kirk.root/tmp6l2lrw3o Connecting to SUT: host Starting suite: shardfile ftrace_regression01: pass (0.975s) ftrace_regression02: [ 24.865534] /usr/local/bin/kirk[769]: starting test ftrace_regression02 (ftrace_regression02.sh) pass (1.037s)

ftrace-stress-test: [ 25.946741] /usr/local/bin/kirk[769]: starting test ftrace-stress-test (ftrace_stress_test.sh 90) [ 35.063437] Scheduler tracepoints stat_sleep, stat_iowait, stat_blocked and stat_runtime require the kernel parameter schedstats=enable or kernel.sched_schedstats=1 [ 35.063795] Scheduler tracepoints stat_sleep, stat_iowait, stat_blocked and stat_runtime require the kernel parameter schedstats=enable or kernel.sched_schedstats=1 [ 97.866749] ------------[ cut here ]------------ [ 97.871613] WARNING: CPU: 6 PID: 13314 at kernel/trace/trace_functions_graph.c:1005 print_graph_entry (kernel/trace/trace_functions_graph.c:1005 (discriminator 1) kernel/trace/trace_functions_graph.c:1229 (discriminator 1)) [ 97.882169] Modules linked in: snd_soc_hdmi_codec ax88179_178a usbnet fuse ip_tables x_tables venus_enc venus_dec mcp251xfd videobuf2_dma_contig snd_soc_sdm845 xhci_pci_renesas can_dev lontium_lt9611 msm snd_soc_rt5663 leds_qcom_lpg ath10k_snoc snd_soc_qcom_sdw hci_uart rtc_pm8xxx ocmem qcom_pbs btqca snd_soc_qcom_common drm_exec ath10k_core qcom_spmi_adc5 btbcm qcom_spmi_temp_alarm qcom_vadc_common ath led_class_multicolor gpu_sched qcom_stats snd_soc_rl6231 mac80211 drm_dp_aux_bus drm_display_helper qcom_pon drm_client_lib reset_qcom_pdc soundwire_bus cfg80211 qcom_camss videobuf2_dma_sg bluetooth videobuf2_memops venus_core phy_qcom_qmp_combo v4l2_mem2mem aux_bridge coresight_stm videobuf2_v4l2 camcc_sdm845 pwrseq_core videobuf2_common i2c_qcom_geni qcom_rng typec qcom_q6v5_mss phy_qcom_qmp_usb ufs_qcom spi_geni_qcom phy_qcom_qmp_ufs qcrypto gpi qrtr rfkill stm_core qcom_wdt phy_qcom_qmp_pcie lmh icc_osm_l3 slim_qcom_ngd_ctrl slimbus pdr_interface qcom_pdr_msg qcom_q6v5_pas qcom_pil_info qcom_q6v5 qcom_sysmon [ 97.884162] qcom_common icc_bwmon llcc_qcom qcom_glink_smem mdt_loader display_connector drm_kms_helper qmi_helpers drm backlight socinfo rmtfs_mem [ 97.989673] CPU: 6 UID: 0 PID: 13314 Comm: cat Not tainted 6.15.0-rc7 #1 PREEMPT [ 97.997392] Hardware name: Thundercomm Dragonboard 845c (DT) [ 98.003243] pstate: a0400005 (NzCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 98.010424] pc : print_graph_entry (kernel/trace/trace_functions_graph.c:1005 (discriminator 1) kernel/trace/trace_functions_graph.c:1229 (discriminator 1)) [ 98.015043] lr : print_graph_entry (kernel/trace/trace_functions_graph.c:604 kernel/trace/trace_functions_graph.c:1225) [ 98.019659] sp : ffff80008fd8fb10 [ 98.023126] x29: ffff80008fd8fb70 x28: ffff124e013d5700 x27: ffff124e013d5720 [ 98.030552] x26: ffffdb1ef470098c x25: 0000000000000001 x24: ffff124e013d5700 [ 98.037984] x23: ffff124e18cac000 x22: 0000000000000696 x21: 00000000fefefefe [ 98.045410] x20: ffff124e18ca8000 x19: ffff124e18caa090 x18: 0000000000000000 [ 98.052835] x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 [ 98.060265] x14: 0000000000000001 x13: 0000000000000001 x12: 000003dd0200000b [ 98.067696] x11: ffffdb1ef713c5f0 x10: 0000000000000020 x9 : ffffdb1ef462ac10 [ 98.075126] x8 : 0000000000000020 x7 : 0000000000000001 x6 : 0000000000000029 [ 98.082552] x5 : ffff124e18caa094 x4 : ffffdb1ef6754af6 x3 : 0000000000000001 [ 98.089979] x2 : ffffdb1ef713b208 x1 : ffff372f84970000 x0 : ffffffdfbf6bd8e0 [ 98.097407] Call trace: [ 98.099979] print_graph_entry (kernel/trace/trace_functions_graph.c:1005 (discriminator 1) kernel/trace/trace_functions_graph.c:1229 (discriminator 1)) (P) [ 98.104598] print_graph_function_flags (kernel/trace/trace_functions_graph.c:1423) [ 98.109654] print_graph_function (kernel/trace/trace_functions_graph.c:1467) [ 98.114005] print_trace_line (kernel/trace/trace.c:4347) [ 98.118091] tracing_read_pipe (kernel/trace/trace.c:3840 kernel/trace/trace.c:6686) [ 98.122358] vfs_read (fs/read_write.c:568) [ 98.125734] ksys_read (fs/read_write.c:713) (F) [ 98.129555] __arm64_sys_read (fs/read_write.c:720) (F) [ 98.133903] invoke_syscall.constprop.0 (arch/arm64/include/asm/syscall.h:61 arch/arm64/kernel/syscall.c:54) (F) [ 98.139146] do_el0_svc (arch/arm64/kernel/syscall.c:139 arch/arm64/kernel/syscall.c:151) (F) [ 98.142968] el0_svc (arch/arm64/include/asm/irqflags.h:82 (discriminator 1) arch/arm64/include/asm/irqflags.h:123 (discriminator 1) arch/arm64/include/asm/irqflags.h:136 (discriminator 1) arch/arm64/kernel/entry-common.c:165 (discriminator 1) arch/arm64/kernel/entry-common.c:178 (discriminator 1) arch/arm64/kernel/entry-common.c:745 (discriminator 1)) (F) [ 98.146615] el0t_64_sync_handler (arch/arm64/kernel/entry-common.c:763) [ 98.151144] el0t_64_sync (arch/arm64/kernel/entry.S:600) [ 98.154966] ---[ end trace 0000000000000000 ]--- Restarting SUT: host dynamic_debug01: [ 123.083214] /usr/local/bin/kirk[769]: starting test dynamic_debug01 (dynamic_debug01.sh)

## Source * Kernel version: 6.15.0-rc7 * Git tree: https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux.git * Git sha: 4a95bc121ccdaee04c4d72f84dbfa6b880a514b6

## Build * Test log: https://lkft-staging.validation.linaro.org/scheduler/job/166778#L6126 * Build link: https://storage.tuxsuite.com/public/linaro/lkft/builds/2xP3N7qYnNfT17IiSMUSt... * Kernel config: https://storage.tuxsuite.com/public/linaro/lkft/builds/2xP3N7qYnNfT17IiSMUSt...

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