6.15-stable review patch. If anyone has any objections, please let me know.
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From: Jie Gan jie.gan@oss.qualcomm.com
[ Upstream commit bd4f35786d5f0798cc1f8c187a81a7c998e6c58f ]
An infinite loop has been created by the Coresight devices. When only a source device is enabled, the coresight_find_activated_sysfs_sink function is recursively invoked in an attempt to locate an active sink device, ultimately leading to a stack overflow and system crash. Therefore, disable the replicator1 to break the infinite loop and prevent a potential stack overflow.
replicator1_out -> funnel_swao_in6 -> tmc_etf_swao_in -> tmc_etf_swao_out | | replicator1_in replicator_swao_in | | replicator0_out1 replicator_swao_out0 | | replicator0_in funnel_in1_in3 | | tmc_etf_out <- tmc_etf_in <- funnel_merg_out <- funnel_merg_in1 <- funnel_in1_out
[call trace] dump_backtrace+0x9c/0x128 show_stack+0x20/0x38 dump_stack_lvl+0x48/0x60 dump_stack+0x18/0x28 panic+0x340/0x3b0 nmi_panic+0x94/0xa0 panic_bad_stack+0x114/0x138 handle_bad_stack+0x34/0xb8 __bad_stack+0x78/0x80 coresight_find_activated_sysfs_sink+0x28/0xa0 [coresight] coresight_find_activated_sysfs_sink+0x5c/0xa0 [coresight] coresight_find_activated_sysfs_sink+0x5c/0xa0 [coresight] coresight_find_activated_sysfs_sink+0x5c/0xa0 [coresight] coresight_find_activated_sysfs_sink+0x5c/0xa0 [coresight] ... coresight_find_activated_sysfs_sink+0x5c/0xa0 [coresight] coresight_enable_sysfs+0x80/0x2a0 [coresight]
side effect after the change: Only trace data originating from AOSS can reach the ETF_SWAO and EUD sinks.
Fixes: bf469630552a ("arm64: dts: qcom: qcs615: Add coresight nodes") Signed-off-by: Jie Gan jie.gan@oss.qualcomm.com Acked-by: Suzuki K Poulose suzuki.poulose@arm.com Link: https://lore.kernel.org/r/20250522005016.2148-1-jie.gan@oss.qualcomm.com Signed-off-by: Bjorn Andersson andersson@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- arch/arm64/boot/dts/qcom/qcs615.dtsi | 1 + 1 file changed, 1 insertion(+)
diff --git a/arch/arm64/boot/dts/qcom/qcs615.dtsi b/arch/arm64/boot/dts/qcom/qcs615.dtsi index 120654849043..e1f510e5485c 100644 --- a/arch/arm64/boot/dts/qcom/qcs615.dtsi +++ b/arch/arm64/boot/dts/qcom/qcs615.dtsi @@ -1868,6 +1868,7 @@ replicator@604a000 {
clocks = <&aoss_qmp>; clock-names = "apb_pclk"; + status = "disabled";
in-ports { port {