From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pg1-f196.google.com (mail-pg1-f196.google.com [209.85.215.196]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B87173E9593 for ; Wed, 21 Jan 2026 08:56:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.196 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768985762; cv=none; b=m94DDhjgEbbLYEBw6YNsSQsJ57BnZmLEFFj9EJD/lXPFj/fqVCpPC8liz1jRK4ue2JOEY+l1W9bHdq5/JFZrPKKxuLcn4p2T883mDOfDnLtilNLuX+PkTKpAMq/PwRDfug1Zug9JOvCQytSwtsvI1qkzwBFJZK1zsNcXw8+stVs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768985762; c=relaxed/simple; bh=i3yjx39tNxxOyvgHxaNh0Nm4uXW3ZL/2K0EMPO2HQS0=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=aXlPvNInbzMg0VTF44daq430hTBKqSuG2snuD2Sk31W32nH5BOBw6irgB9fAQfvoLQpRH2upeFWQ5fnddJKxg67ajiy6S8ouaSjTXFMecUyyvk62NXC4gYJ1eGsgT4MGQHmadMkB7bmNGwzBdbyp72SnSUr3jB17qVlFLlF4jSk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=J1iFBCxa; arc=none smtp.client-ip=209.85.215.196 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="J1iFBCxa" Received: by mail-pg1-f196.google.com with SMTP id 41be03b00d2f7-c613161b489so27360a12.0 for ; Wed, 21 Jan 2026 00:56:00 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1768985760; x=1769590560; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=zeBM33k5QwC3+dSc5byegfVRQgp6Vl7/MfVBS11BjWA=; b=J1iFBCxaTAoagCrAnpbje+ZGs+5gdiwxxM4GMugi8yZKShx6kprkX601NU1RPXycc3 mSmq9see3k44HRT2pMydolz+hINEBCe5ugJjjc6TfI45XFKarOlLFS47B2Y2D9WCoxbn 2PVr9EQ886AbLgNcSA1929hFYU01QVZVItG4Lb1aP9Jcg/oySKlXWHShFSZzecEzIg90 2OFStMOZI3SstgkO+DFs6K5pSu28qIxjBwA7Bd+FVqpawrHszmZeHA5JVAwsNG3nD0VS Yh/pgTVj7DaocB2xzRYcRfV7CIdI+xcZNbXnqTR+f4+c3e4UZQC/feFJHweuGW1sFCQG OLSQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1768985760; x=1769590560; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=zeBM33k5QwC3+dSc5byegfVRQgp6Vl7/MfVBS11BjWA=; b=DHfGvseD6k6O2YqgQJoD0v+QlMn2Fm2J+pm2AG23zBJ7B+lWuJHsKEym3mOSJwRv9F /VSUlqJjtd46lCh4F+w5rUbqbkVh/pN3lekij6+BwLqABRAz/rqEj4n8PWjq7/bvXpzL FK46x1PFxhU7YoHT8qwKjbKJRkMZ1QAF56v3uZY1U7CoTcG4I4iZjDo+BAZ9srC/iADZ xNSD/LIefWZoFBqdeceRapiYRacFfGriof/bFKdhkSr+Chx4+F7sVZILhqrTUnrG5Egv LNs4d9cCAy/lF1zZ0stnzrJsLfjk8Y+5HhNav2JaIZxeJkn0difELrr0jfnFfD7ZoLT9 WHHg== X-Forwarded-Encrypted: i=1; AJvYcCUmF7+rg8onGa3/6gm7Smreiyq1H6nql8m1BG8uyKStUinU4J7e2zaIvfS2xrLHY2dOR7S6v342+RyFpeI=@vger.kernel.org X-Gm-Message-State: AOJu0Yy8QBCT1lXNrzvYwK6Di8HSHIYy1+kjPTDgu3pWRv59UAvFTikQ XJlEMoTqGGOHKLSk85Ww5m4SbTV1cM8VM1Iy3UAoKe1vhDwZy2aCkSz4 X-Gm-Gg: AZuq6aJPPL0Y+MmmI/Veu1PZni6iJxM3g3Cop98SHbhAU2rw3MBH5+m/wsWzew5klht UVd+B5cU4E4K+FLo9DtWJ4oepBArXy8axfw1XybQA3ShIemc1ILi3w0LXJseDIVCnBrMp6X0kcL JvtG2Zl6yQOuithvq3iovLuNYLCFxZbcnTjEQzHPtAMrXBVAZrBU0rN42ziMPnYn58EoF4ZOUpg KICn0Ml9PKVYq2hkF8xMEhMlhpTqsLwT6IZVfRymkP4ursiifJ51odim+XL/U7+rd+dS7JK/0VU 2eVL/HCxxbatjhMTrz+WQmB5VV1JXC94YeCni8OcOAlD/xp+TqpNPfBIiHpNdVrtS4rJxrxrUQs /Zpq5Abuu4sto23Kgx2RhtdVxBJpcex2ynQmTLYH288eWR7/p+0EcU0lJCWQyUt7EvVxxdplHur 4mlo+YGvaMvZ20O9JJ3uoEONeAKGsXqRE3Xhc/ X-Received: by 2002:a05:6a21:1505:b0:38d:f250:7a79 with SMTP id adf61e73a8af0-38e00bb97d9mr16198559637.15.1768985759943; Wed, 21 Jan 2026 00:55:59 -0800 (PST) Received: from eurus-Lenovo-Legion-Y70002021.. ([112.43.109.128]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-c5edf249ce5sm7670822a12.9.2026.01.21.00.55.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Jan 2026 00:55:59 -0800 (PST) From: Wang Jiayue To: hanguidong02@gmail.com Cc: Aishwarya.TCV@arm.com, broonie@kernel.org, chenqiuji666@gmail.com, dakr@kernel.org, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org Subject: Re: [PATCH v5] driver core: enforce device_lock for driver_match_device() Date: Wed, 21 Jan 2026 16:55:49 +0800 Message-Id: <20260121085549.165428-1-akaieurus@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit > I'm seeing boot hangs on Arm Juno in next/pending-fixes which bisect to > this commit. The boot grinds to a halt near the end of boot: > > [ 2.570549] ledtrig-cpu: registered to indicate activity on CPUs > [ 2.618301] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled > [ 2.623547] msm_serial: driver initialized > [ 2.624058] SuperH (H)SCI(F) driver initialized > [ 2.624312] STM32 USART driver initialized After partially modifying juno.dts, I managed to roughly emulate kernel boot on juno board with qemu and successfully reproduced the boot hang. Below is the gdb backtrace: #0 0xffff800080114ae0 in mutex_spin_on_owner (lock=0xffff0000036bfc90, owner=0xffff000003510000, ww_ctx=0x0, waiter=0x0) at kernel/locking/mutex.c:377 #1 0xffff80008118cecc in mutex_optimistic_spin (waiter=, ww_ctx=, lock=) at kernel/locking/mutex.c:480 #2 __mutex_lock_common (use_ww_ctx=, ww_ctx=, ip=, nest_lock=, subclass=, state=, lock=) at kernel/locking/mutex.c:618 #3 __mutex_lock (lock=0xffff0000036bfc90, state=0x2, ip=, nest_lock=, subclass=) at kernel/locking/mutex.c:776 #4 0xffff80008118d1dc in __mutex_lock_slowpath (lock=0xffff0000036bfc90) at kernel/locking/mutex.c:1065 #5 0xffff80008118d230 in mutex_lock (lock=0xffff0000036bfc90) at kernel/locking/mutex.c:290 #6 0xffff8000809cdd1c in device_lock (dev=) at ./include/linux/device.h:895 #7 class_device_constructor (_T=) at ./include/linux/device.h:913 #8 driver_match_device_locked (dev=, drv=) at drivers/base/base.h:193 #9 __driver_attach (dev=0xffff0000036bfc10, data=0xffff800082e64440 ) at drivers/base/dd.c:1183 #10 0xffff8000809cb17c in bus_for_each_dev (bus=0xffff0000036bfc90, start=0x0, data=0xffff800082e64440 , fn=0xffff8000809cdcec <__driver_attach>) at drivers/base/bus.c:383 #11 0xffff8000809cd03c in driver_attach (drv=0x0) at drivers/base/dd.c:1245 #12 0xffff8000809cc748 in bus_add_driver (drv=0xffff800082e64440 ) at drivers/base/bus.c:715 #13 0xffff8000809ced28 in driver_register (drv=0xffff800082e64440 ) at drivers/base/driver.c:249 #14 0xffff8000809d0254 in __platform_driver_register (drv=0x0, owner=0xffff000003510000) at drivers/base/platform.c:908 #15 0xffff8000809a6208 in qcom_smmu_impl_init (smmu=0xffff0000037c0080) at drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c:780 #16 0xffff8000809a48a0 in arm_smmu_impl_init (smmu=0xffff0000037c0080) at drivers/iommu/arm/arm-smmu/arm-smmu-impl.c:224 #17 0xffff8000809a2ae0 in arm_smmu_device_probe (pdev=0xffff0000036bfc00) at drivers/iommu/arm/arm-smmu/arm-smmu.c:2155 #18 0xffff8000809d060c in platform_probe (_dev=0xffff0000036bfc10) at drivers/base/platform.c:1446 #19 0xffff8000809cd6a4 in call_driver_probe (drv=, dev=) at drivers/base/dd.c:583 #20 really_probe (dev=0xffff0000036bfc10, drv=0xffff800082e641c0 ) at drivers/base/dd.c:661 #21 0xffff8000809cd8f8 in __driver_probe_device (drv=0xffff800082e641c0 , dev=0xffff0000036bfc10) at drivers/base/dd.c:803 #22 0xffff8000809cdb34 in driver_probe_device (drv=0xffff0000036bfc90, dev=0xffff0000036bfc10) at drivers/base/dd.c:833 #23 0xffff8000809cddb8 in __driver_attach (data=, dev=) at drivers/base/dd.c:1227 #24 __driver_attach (dev=0xffff0000036bfc10, data=0xffff800082e641c0 ) at drivers/base/dd.c:1167 #25 0xffff8000809cb17c in bus_for_each_dev (bus=0xffff0000036bfc90, start=0x0, data=0xffff800082e641c0 , fn=0xffff8000809cdcec <__driver_attach>) at drivers/base/bus.c:383 #26 0xffff8000809cd03c in driver_attach (drv=0x0) at drivers/base/dd.c:1245 #27 0xffff8000809cc748 in bus_add_driver (drv=0xffff800082e641c0 ) at drivers/base/bus.c:715 #28 0xffff8000809ced28 in driver_register (drv=0xffff800082e641c0 ) at drivers/base/driver.c:249 #29 0xffff8000809d0254 in __platform_driver_register (drv=0x0, owner=0xffff000003510000) at drivers/base/platform.c:908 #30 0xffff800081f3d12c in arm_smmu_driver_init () at drivers/iommu/arm/arm-smmu/arm-smmu.c:2368 #31 0xffff800080015218 in do_one_initcall (fn=0xffff800081f3d10c ) at init/main.c:1378 #32 0xffff800081ed13e4 in do_initcall_level (command_line=, level=) at init/main.c:1440 #33 do_initcalls () at init/main.c:1456 #34 do_basic_setup () at init/main.c:1475 #35 kernel_init_freeable () at init/main.c:1688 #36 0xffff800081187b50 in kernel_init (unused=0xffff0000036bfc90) at init/main.c:1578 #37 0xffff800080015f58 in ret_from_fork () at arch/arm64/kernel/entry.S:860 Backtrace stopped: previous frame identical to this frame (corrupt stack?)