From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx3.molgen.mpg.de (mx3.molgen.mpg.de [141.14.17.11]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 56819264F9F; Tue, 8 Apr 2025 09:27:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=141.14.17.11 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744104468; cv=none; b=PKLOSt/hoz2hR6dAPvmCJZocjwM4tnCjzNSC7aknGEUa0lqgWhVLPWSOjW10a92rk4KYpH4xPQP7oKS6MbjmtKEyWt3uyQrmxhsmbebPGCbx3qgFUAB/v1LbBjqHe6MrTzo6qkcCRLoyIxJbRoTx1DYzFjqbpE60CnAk96qyIEU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744104468; c=relaxed/simple; bh=aMbRfljk3VL783Mt6idyLGub6ZrKA5QxLM0kTwp3sf0=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=VixKrsH011ScrPXYbbs/7+TDmWYI0hLNhX1C0CXI7jttt/9e8w9FgIxl+/z+r9w4R9IzKOOsQqPIq22loaDq2QyC350CAyrWmHZPx3Yk7xsa3ez0l/mhN9SgUj5CBuqb7YZAk+FoBs9a7jM21If5tf8JgJp2WP9ato+PVejZmDU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=molgen.mpg.de; spf=pass smtp.mailfrom=molgen.mpg.de; arc=none smtp.client-ip=141.14.17.11 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=molgen.mpg.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=molgen.mpg.de Received: from [141.14.220.43] (g43.guest.molgen.mpg.de [141.14.220.43]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: pmenzel) by mx.molgen.mpg.de (Postfix) with ESMTPSA id AD33E61E647BB; Tue, 08 Apr 2025 11:26:48 +0200 (CEST) Message-ID: Date: Tue, 8 Apr 2025 11:26:47 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Kernel WARNING (RCU) with btnxpuart on TI AM62 platform To: Francesco Dolcini Cc: Amitkumar Karwar , Neeraj Kale , Nishanth Menon , Tero Kristo , Santosh Shilimkar , linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-pm@vger.kernel.org, linux-serial@vger.kernel.org, regressions@lists.linux.dev References: <20250408083512.GA26035@francesco-nb> Content-Language: en-US From: Paul Menzel In-Reply-To: <20250408083512.GA26035@francesco-nb> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit [Cc: +regressions@] #regzbot introduced: v6.14..v6.15-rc1 Dear Francesco, Thank you for your report. Am 08.04.25 um 10:35 schrieb Francesco Dolcini: > I do have the following kernel warning with 6.15-rc1, on a TI AM62 > platform (arm64), single CPU core, using btnxpuart driver, any idea? > PREEMPT_RT is enabled, if it matters. > > Either the issue is not systematic, or multi cores SoCs are not affected > (no error on the exact same image on a dual nor on quad core TI AM62). > > > [ 23.139080] Voluntary context switch within RCU read-side critical section! > [ 23.139119] WARNING: CPU: 0 PID: 61 at /kernel/rcu/tree_plugin.h:332 rcu_note_context_switch+0x3c4/0x430 > [ 23.139172] Modules linked in: uas onboard_usb_dev optee_rng dwc3 evdev btnxpuart spidev aes_ce_blk aes_ce_cipher ghash_ce gf128mul sha2_ce sha256_arm64 sha1_ce snd_soc_simple_card snd_soc_simple_card_utils optee spi_cadence_quadspi tee gpio_keys usb_conn_gpio display_connector roles dwc3_am62 mwifiex_sdio k3_j72xx_bandgap mwifiex rtc_ti_k3 cfg80211 tidss sa2ul sha512_generic snd_soc_davinci_mcasp authenc drm_display_helper snd_soc_ti_udma crypto_null snd_soc_ti_edma sha1_generic snd_soc_ti_sdma omap_hwspinlock lontium_lt8912b ina2xx snd_soc_wm8904 ti_ads1015 industrialio_triggered_buffer kfifo_buf lm75 tpm_tis_i2c tps65219_pwrbutton crc_ccitt tpm_tis_core tpm rng_core tc358768 m_can_platform pwm_tiehrpwm m_can spi_omap2_mcspi can_dev bluetooth ecdh_generic ecc rfkill libaes loop fuse ipv6 autofs4 > [ 23.139459] CPU: 0 UID: 0 PID: 61 Comm: kworker/u5:0 Not tainted 6.15.0-rc1-0.0.0-devel #1 PREEMPT_RT > [ 23.139471] Hardware name: Toradex Verdin AM62 WB on Dahlia Board (DT) > [ 23.139478] Workqueue: hci0 hci_power_off [bluetooth] > [ 23.139615] pstate: 600000c5 (nZCv daIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--) > [ 23.139625] pc : rcu_note_context_switch+0x3c4/0x430 > [ 23.139647] lr : rcu_note_context_switch+0x3c4/0x430 > [ 23.139658] sp : ffff8000819fb740 > [ 23.139661] x29: ffff8000819fb740 x28: 0000000000000000 x27: ffff0000079d2010 > [ 23.139673] x26: ffff0000011e7810 x25: ffff000001c2c200 x24: 0000000000000000 > [ 23.139688] x23: 0000000000000000 x22: ffff000001c2c200 x21: ffff000001c2c200 > [ 23.139700] x20: ffff800081083ec0 x19: ffff00001da9fec0 x18: fffffffffffe7e78 > [ 23.139712] x17: ffff7fff9ca1c000 x16: ffff800080000000 x15: ffff00001da9f8c0 > [ 23.139726] x14: fffffffffffc7e77 x13: 216e6f6974636573 x12: 206c616369746972 > [ 23.139738] x11: 6320656469732d64 x10: 6165722055435220 x9 : 206e696874697720 > [ 23.139750] x8 : ffff80008113f040 x7 : ffff8000819fb4e0 x6 : 000000000000000c > [ 23.139761] x5 : ffff00001da95888 x4 : 0000000000000000 x3 : 0000000000000027 > [ 23.139775] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff000001c2c200 > [ 23.139788] Call trace: > [ 23.139793] rcu_note_context_switch+0x3c4/0x430 (P) > [ 23.139813] __schedule+0xa0/0x7dc > [ 23.139830] schedule+0x34/0x11c > [ 23.139841] schedule_timeout+0x8c/0x110 > [ 23.139861] wait_for_completion_timeout+0x78/0x14c > [ 23.139873] ti_sci_set_device_state+0x120/0x1fc > [ 23.139886] ti_sci_cmd_get_device_exclusive+0x18/0x30 > [ 23.139899] ti_sci_pd_power_on+0x28/0x54 > [ 23.139916] _genpd_power_on+0x98/0x188 > [ 23.139927] genpd_power_on+0xa8/0x168 > [ 23.139940] genpd_runtime_resume+0xc0/0x298 > [ 23.139957] __rpm_callback+0x48/0x1a4 > [ 23.139974] rpm_callback+0x74/0x80 > [ 23.139987] rpm_resume+0x3b0/0x698 > [ 23.140000] __pm_runtime_resume+0x48/0x88 > [ 23.140012] omap8250_set_mctrl+0x2c/0xbc > [ 23.140030] serial8250_set_mctrl+0x20/0x40 > [ 23.140046] uart_update_mctrl+0x80/0x110 > [ 23.140062] uart_dtr_rts+0x104/0x118 > [ 23.140079] tty_port_shutdown+0xd4/0xe0 > [ 23.140092] tty_port_close+0x3c/0xb8 > [ 23.140103] uart_close+0x34/0x98 > [ 23.140116] ttyport_close+0x50/0xa0 > [ 23.140137] serdev_device_close+0x40/0x5c > [ 23.140150] btnxpuart_close+0x1c/0xa0 [btnxpuart] > [ 23.140175] hci_dev_close_sync+0x304/0x7cc [bluetooth] > [ 23.140243] hci_dev_do_close+0x2c/0x70 [bluetooth] > [ 23.140309] hci_power_off+0x20/0x64 [bluetooth] > [ 23.140379] process_one_work+0x148/0x284 > [ 23.140403] worker_thread+0x2c8/0x3dc > [ 23.140414] kthread+0x12c/0x208 > [ 23.140426] ret_from_fork+0x10/0x20 As I understood, that it’s a regression, and you can reproduce it, would it be possible, that you bisected the issue? Kind regards, Paul