From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id ED885E7718B for ; Sat, 28 Dec 2024 02:04:01 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 0DD906B007B; Fri, 27 Dec 2024 21:04:01 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 08D6C6B0082; Fri, 27 Dec 2024 21:04:01 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id E6FAD6B0083; Fri, 27 Dec 2024 21:04:00 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0010.hostedemail.com [216.40.44.10]) by kanga.kvack.org (Postfix) with ESMTP id BF3906B007B for ; Fri, 27 Dec 2024 21:04:00 -0500 (EST) Received: from smtpin14.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay08.hostedemail.com (Postfix) with ESMTP id 2E2E3140C2C for ; Sat, 28 Dec 2024 02:04:00 +0000 (UTC) X-FDA: 82942721820.14.EC92B65 Received: from mail-qt1-f176.google.com (mail-qt1-f176.google.com [209.85.160.176]) by imf13.hostedemail.com (Postfix) with ESMTP id 6A0F12000A for ; Sat, 28 Dec 2024 02:03:16 +0000 (UTC) Authentication-Results: imf13.hostedemail.com; dkim=pass header.d=google.com header.s=20230601 header.b="HwHFTE/+"; spf=pass (imf13.hostedemail.com: domain of surenb@google.com designates 209.85.160.176 as permitted sender) smtp.mailfrom=surenb@google.com; dmarc=pass (policy=reject) header.from=google.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1735351397; a=rsa-sha256; cv=none; b=azXPH8Ie0PDb1a+RVlMJGD5+29lptGztwzjlcwRgck5hnMkmyPvHDBYJm9CShzCSDhPHZL CKlCja5OLLEDb+WlO6UG85fMiQSHZyEye9pUSMpxM55za4YFDjtgTpgEPbqtri7HpMQs/o CLjM++Idd/AMXSjunAGY+/r1aMbpbLQ= ARC-Authentication-Results: i=1; imf13.hostedemail.com; dkim=pass header.d=google.com header.s=20230601 header.b="HwHFTE/+"; spf=pass (imf13.hostedemail.com: domain of surenb@google.com designates 209.85.160.176 as permitted sender) smtp.mailfrom=surenb@google.com; dmarc=pass (policy=reject) header.from=google.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1735351397; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=KXpIp2OAIE40cZduTGEbrNKES3oSVQBa556eNI7loyc=; b=oJfPvv/OZv/Ne9wIIdJWQkSaBtlgLUTM9NC81AQ17/Kz6Ke2wvU84kQSVX4ifEpcHPSt/I /tN+9AHSZ+oJC4WqKeC78xh8wrg6BbwXp/mtOSO4832Zo2U10aPkjqSxCOcMByOQhWWhF3 ZwvEC8JvzTc1HgZxnTx/6cI3ppUL5Qg= Received: by mail-qt1-f176.google.com with SMTP id d75a77b69052e-4678c9310afso2022491cf.1 for ; Fri, 27 Dec 2024 18:03:58 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1735351437; x=1735956237; darn=kvack.org; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:from:to:cc:subject:date :message-id:reply-to; bh=KXpIp2OAIE40cZduTGEbrNKES3oSVQBa556eNI7loyc=; b=HwHFTE/+FCMzS2kuoh3/mXbueA53jnT5p+SgCRyrBlfYFeyxAXuS+uXf1Ak3htH/zP S3X0Oa/pkO73yuVltTygSlFBuhyjYvKSe9bnBsVilKN2CpxuHzFhN3uWAdz7dK9D/sjn sRVtctOgvhCUdd//XsDwCsQVv0TO1FbFuiG93cEzxtS9UYspXtAfva0naDrmHv45RpZd +TaV4MJGytZydTO2SEXKI4qWsuA62sp+vB2K4yVtzOy8aru4Tf+VWSqRhsaramZJBTQG DEC5QIfcCAiCv3NT55ISuYmnetycJ7USEcl4q6v5gHKgehe6mY48yjYG3SOgW5/JbVh9 higQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1735351437; x=1735956237; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=KXpIp2OAIE40cZduTGEbrNKES3oSVQBa556eNI7loyc=; b=hGnOZqWAQVD6KbPBl4mAQe9YCM5hjkR5sHB+ZjVCTs1eWuHafbKQDpzwLcJHyl1Wcd eQb7aDLpRC4apzrbmm9HkieBDFHSteMJ6nlB9KwL3M0FirFToNhT+ipxVfQg1cYjPpfu 01EQOfPDBPJs0cN6NGyCwhkCLUeBJ/rJmoYg+MpCj7A2QjvioX4rqA/ubIsFwYvQ3tY5 jVHMKk4VKBnbQTwSsoTN8V3v5c1tUrGiIbo7PhZvruJSFpNLff5Bb+uiKZ2bAj2fcC61 uaR6J6DQoKoP3DGlJ3FREo+nKT0obvePjmyFthkamcvZnSt3Bk4NDJXQZiVTyo39j16f s5Ow== X-Forwarded-Encrypted: i=1; AJvYcCVVTnIgydylJNN6M3824ew/O3u2L6Cl5EeQ9KB1HdIpD7RXuw8mWHXNiLlHsom8mZ7if0hDedMFtw==@kvack.org X-Gm-Message-State: AOJu0YyROWyAs/loUworUJ4mZiKNkmHtyDmI4qPONNVqkOb2gwm7n4Qv 0U46bp6hJ73/Aj2GB/eBuq56pxXiptaf4xmO7gABLolwvMg1DA8u3QEvDvE/+n/R2G1ws5I7fcO IF8CTfTgmEsY8NnHAolnVyDF5qDo9xLlDeF7+ X-Gm-Gg: ASbGncuBOes2HXj+nm0ThnjvIF0ORf+a0O3+Tq/aynJbOVVNgOQlCVNMDeQmFpFuyJl PQLr6PQNxOwhUGjB933uU6gPkw9dyGjutPNLDjw== X-Google-Smtp-Source: AGHT+IHptb1zXvZR99/1ro/5A/WyD8cV1XrxiR+6JtWVjsbzzP7eu/XmeH2tFnvy6h5keq9+/Eb7BqLu7+9q4Lx6hdE= X-Received: by 2002:ac8:7e96:0:b0:466:8356:8b71 with SMTP id d75a77b69052e-46a4c01b3f5mr21973531cf.19.1735351436989; Fri, 27 Dec 2024 18:03:56 -0800 (PST) MIME-Version: 1.0 References: <676ea4aa.050a0220.2f3838.0483.GAE@google.com> <20241228001926.517-1-hdanton@sina.com> In-Reply-To: <20241228001926.517-1-hdanton@sina.com> From: Suren Baghdasaryan Date: Fri, 27 Dec 2024 18:03:45 -0800 Message-ID: Subject: Re: [syzbot] [net?] possible deadlock in vm_insert_page To: Hillf Danton Cc: Boqun Feng , syzbot , Tetsuo Handa , edumazet@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Queue-Id: 6A0F12000A X-Stat-Signature: fc4a1dzftk4ck5q5g59df99ccszk78hi X-Rspam-User: X-Rspamd-Server: rspam09 X-HE-Tag: 1735351396-335324 X-HE-Meta: U2FsdGVkX193iBAPUhvfzAGrnz7ma2xhhvrBEjAAW/rZyGbFKBMbZTDW3VOXq7SEoxFU8O9v4jwqK9iKkrVQ01b3Z1m/KoJFAq1arJHAtDvslETpOaiOCDL1yVA1zy5gVu4WzwrSIJnUN/0mHFucHzDoZwCkkTW2Tsqm/fhUxmYeHBqOvJJObHCtrdf0b8RZpWEia9Vki9e/G7x8ZbecKMm/011PxrUm0rayfTxeryVohRK/rNe++A5d+Apf1+Uw/McVCG8JNiZ6vyfy28fBNew2JgcXbnjjoXIvHw2JF7Lj5Tdbwnl9x61jysZ560CjCGNkS6Nb7kxvjWWQriZ16vxiKFSwtXrg/bVvCrpRX/NBObG3gaPUKXsyNljqvAVCrq5uUUfYg0u6uHEeJzyiuRSkeZKcwsYsec5weaS2IE7/ej5EF8sAqWJLD5l8OKzNxWAxszucYsF8XWT4H3phSadDKjFCfoGJ2zbGq3vTP0i+MiOVCFByNPmJi+YK9SO78AINErOHBvD7PU5c6TJluznDYKIHA7fA5olMyLD/4S2+GzZy23vRhijvPrPnYltpt5O+dVjW1BKCeg3zoaV+mRU8G5wVLgrvTcZWC4GJ739q3zxjIlJcZP1/twcxeD7Zw0VwBr4dUZuwq8fOQkLbA7ZpDRiFKUQap/2ayvwDnYkiQw3f1xnR1kzld8NoNsa2YfK0L64gCEUA4bSSW32DSrppaVtTuDPuFDQ80HBotAP25Mv+c1ICCCGHoqg0tOSLMI/NrX4dzFAQhqUjuG7tJXqaXgq900CL6ThvFMMN+ioBvP3qrghqAXKjBkVFvz7WRIfTp0k4d7yCp0aN+4+SeAKmnQh+Vmn/eSnm5MPUfjhkBZl8GoIfjV2/a/3ww3Gg3+8Z+HntYvZ6io7WMGpuCaLBmUBf9xBF1vvnqudKI/cpfNZj74oEsNZqeOW6F/Hpb+9oaBye7aw0seJT9Kb dJGByVfv 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 IT2z6Qg1 ABnosmjAPLkyXrSLqNMxcrYU3IgEighxUVdLvTDFtYKRApXnKfNao3/kQeouEGLPluzkX0T+cVU9K6DrJI7IVROxxNI/poEut4bzEPkDi0A= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, Dec 27, 2024 at 4:19=E2=80=AFPM Hillf Danton wro= te: > > On Fri, 27 Dec 2024 04:59:22 -0800 > > Hello, > > > > syzbot found the following issue on: > > > > HEAD commit: 573067a5a685 Merge branch 'for-next/core' into for-kern= elci > > git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/lin= ux.git for-kernelci > > console output: https://syzkaller.appspot.com/x/log.txt?x=3D149fdfe8580= 000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=3Dcd7202b56d4= 69648 > > dashboard link: https://syzkaller.appspot.com/bug?extid=3D11701838dd424= 28ab7b3 > > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for D= ebian) 2.40 > > userspace arch: arm64 > > > > Unfortunately, I don't have any reproducer for this issue yet. > > > > Downloadable assets: > > disk image: https://storage.googleapis.com/syzbot-assets/9d3b5c855aa0/d= isk-573067a5.raw.xz > > vmlinux: https://storage.googleapis.com/syzbot-assets/0c06fc1ead83/vmli= nux-573067a5.xz > > kernel image: https://storage.googleapis.com/syzbot-assets/3390e59b9e4b= /Image-573067a5.gz.xz > > > > IMPORTANT: if you fix the issue, please add the following tag to the co= mmit: > > Reported-by: syzbot+11701838dd42428ab7b3@syzkaller.appspotmail.com > > > > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D > > WARNING: possible circular locking dependency detected > > 6.13.0-rc3-syzkaller-g573067a5a685 #0 Not tainted > > ------------------------------------------------------ > > syz.8.396/8273 is trying to acquire lock: > > ffff0000d0caa9b8 (&vma->vm_lock->lock){++++}-{4:4}, at: vma_start_write= include/linux/mm.h:769 [inline] > > ffff0000d0caa9b8 (&vma->vm_lock->lock){++++}-{4:4}, at: vm_flags_set in= clude/linux/mm.h:899 [inline] > > ffff0000d0caa9b8 (&vma->vm_lock->lock){++++}-{4:4}, at: vm_insert_page+= 0x2a0/0xab0 mm/memory.c:2241 > > > > but task is already holding lock: > > ffff0000d4aa2868 (&po->pg_vec_lock){+.+.}-{4:4}, at: packet_mmap+0x9c/0= x4c8 net/packet/af_packet.c:4650 > > > > which lock already depends on the new lock. > > > > > > the existing dependency chain (in reverse order) is: > > > > -> #10 (&po->pg_vec_lock){+.+.}-{4:4}: > > __mutex_lock_common+0x218/0x28f4 kernel/locking/mutex.c:585 > > __mutex_lock kernel/locking/mutex.c:735 [inline] > > mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:787 > > packet_mmap+0x9c/0x4c8 net/packet/af_packet.c:4650 > > sock_mmap+0x90/0xa8 net/socket.c:1403 > > call_mmap include/linux/fs.h:2183 [inline] > > mmap_file mm/internal.h:124 [inline] > > __mmap_new_file_vma mm/vma.c:2291 [inline] > > __mmap_new_vma mm/vma.c:2355 [inline] > > __mmap_region+0x1854/0x2180 mm/vma.c:2456 > > mmap_region+0x1f4/0x370 mm/mmap.c:1348 > > do_mmap+0x8b0/0xfd0 mm/mmap.c:496 > > vm_mmap_pgoff+0x1a0/0x38c mm/util.c:580 > > ksys_mmap_pgoff+0x3a4/0x5c8 mm/mmap.c:542 > > __do_sys_mmap arch/arm64/kernel/sys.c:28 [inline] > > __se_sys_mmap arch/arm64/kernel/sys.c:21 [inline] > > __arm64_sys_mmap+0xf8/0x110 arch/arm64/kernel/sys.c:21 > > __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] > > invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 > > el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 > > do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 > > el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 > > el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c= :762 > > el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 > > > > -> #9 (&mm->mmap_lock){++++}-{4:4}: > > __might_fault+0xc4/0x124 mm/memory.c:6751 > > drm_mode_object_get_properties+0x208/0x540 drivers/gpu/drm/drm_m= ode_object.c:407 > > drm_mode_obj_get_properties_ioctl+0x2bc/0x4fc drivers/gpu/drm/dr= m_mode_object.c:459 > > drm_ioctl_kernel+0x26c/0x368 drivers/gpu/drm/drm_ioctl.c:796 > > drm_ioctl+0x624/0xb14 drivers/gpu/drm/drm_ioctl.c:893 > > vfs_ioctl fs/ioctl.c:51 [inline] > > __do_sys_ioctl fs/ioctl.c:906 [inline] > > __se_sys_ioctl fs/ioctl.c:892 [inline] > > __arm64_sys_ioctl+0x14c/0x1cc fs/ioctl.c:892 > > __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] > > invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 > > el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 > > do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 > > el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 > > el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c= :762 > > el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 > > > > -> #8 (crtc_ww_class_mutex){+.+.}-{4:4}: > > ww_acquire_init include/linux/ww_mutex.h:162 [inline] > > drm_modeset_acquire_init+0x1e4/0x384 drivers/gpu/drm/drm_modeset= _lock.c:250 > > drmm_mode_config_init+0xb98/0x130c drivers/gpu/drm/drm_mode_conf= ig.c:453 > > vkms_modeset_init drivers/gpu/drm/vkms/vkms_drv.c:158 [inline] > > vkms_create drivers/gpu/drm/vkms/vkms_drv.c:219 [inline] > > vkms_init+0x2fc/0x600 drivers/gpu/drm/vkms/vkms_drv.c:256 > > do_one_initcall+0x254/0x9f8 init/main.c:1266 > > do_initcall_level+0x154/0x214 init/main.c:1328 > > do_initcalls+0x58/0xac init/main.c:1344 > > do_basic_setup+0x8c/0xa0 init/main.c:1363 > > kernel_init_freeable+0x324/0x478 init/main.c:1577 > > kernel_init+0x24/0x2a0 init/main.c:1466 > > ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 > > > > -> #7 (crtc_ww_class_acquire){+.+.}-{0:0}: > > ww_acquire_init include/linux/ww_mutex.h:161 [inline] > > drm_modeset_acquire_init+0x1c4/0x384 drivers/gpu/drm/drm_modeset= _lock.c:250 > > drm_client_modeset_commit_atomic+0xd8/0x724 drivers/gpu/drm/drm_= client_modeset.c:1009 > > drm_client_modeset_commit_locked+0xd0/0x4a8 drivers/gpu/drm/drm_= client_modeset.c:1173 > > drm_client_modeset_commit+0x50/0x7c drivers/gpu/drm/drm_client_m= odeset.c:1199 > > __drm_fb_helper_restore_fbdev_mode_unlocked+0xd4/0x178 drivers/g= pu/drm/drm_fb_helper.c:237 > > drm_fb_helper_set_par+0xc4/0x110 drivers/gpu/drm/drm_fb_helper.c= :1351 > > fbcon_init+0xf34/0x1eb8 drivers/video/fbdev/core/fbcon.c:1113 > > visual_init+0x27c/0x548 drivers/tty/vt/vt.c:1011 > > do_bind_con_driver+0x7dc/0xe04 drivers/tty/vt/vt.c:3833 > > do_take_over_console+0x4ac/0x5f0 drivers/tty/vt/vt.c:4399 > > do_fbcon_takeover+0x158/0x260 drivers/video/fbdev/core/fbcon.c:5= 49 > > do_fb_registered drivers/video/fbdev/core/fbcon.c:2988 [inline] > > fbcon_fb_registered+0x370/0x4ec drivers/video/fbdev/core/fbcon.c= :3008 > > do_register_framebuffer drivers/video/fbdev/core/fbmem.c:449 [in= line] > > register_framebuffer+0x470/0x610 drivers/video/fbdev/core/fbmem.= c:515 > > __drm_fb_helper_initial_config_and_unlock+0x137c/0x1910 drivers/= gpu/drm/drm_fb_helper.c:1841 > > drm_fb_helper_initial_config+0x48/0x64 drivers/gpu/drm/drm_fb_he= lper.c:1906 > > drm_fbdev_client_hotplug+0x158/0x22c drivers/gpu/drm/drm_fbdev_c= lient.c:51 > > drm_client_register+0x144/0x1e0 drivers/gpu/drm/drm_client.c:140 > > drm_fbdev_client_setup+0x1a4/0x39c drivers/gpu/drm/drm_fbdev_cli= ent.c:158 > > drm_client_setup+0x28/0x9c drivers/gpu/drm/drm_client_setup.c:29 > > vkms_create drivers/gpu/drm/vkms/vkms_drv.c:230 [inline] > > vkms_init+0x4f0/0x600 drivers/gpu/drm/vkms/vkms_drv.c:256 > > do_one_initcall+0x254/0x9f8 init/main.c:1266 > > do_initcall_level+0x154/0x214 init/main.c:1328 > > do_initcalls+0x58/0xac init/main.c:1344 > > do_basic_setup+0x8c/0xa0 init/main.c:1363 > > kernel_init_freeable+0x324/0x478 init/main.c:1577 > > kernel_init+0x24/0x2a0 init/main.c:1466 > > ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 > > > > -> #6 (&client->modeset_mutex){+.+.}-{4:4}: > > __mutex_lock_common+0x218/0x28f4 kernel/locking/mutex.c:585 > > __mutex_lock kernel/locking/mutex.c:735 [inline] > > mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:787 > > drm_client_modeset_probe+0x304/0x3f64 drivers/gpu/drm/drm_client= _modeset.c:834 > > __drm_fb_helper_initial_config_and_unlock+0x104/0x1910 drivers/g= pu/drm/drm_fb_helper.c:1818 > > drm_fb_helper_initial_config+0x48/0x64 drivers/gpu/drm/drm_fb_he= lper.c:1906 > > drm_fbdev_client_hotplug+0x158/0x22c drivers/gpu/drm/drm_fbdev_c= lient.c:51 > > drm_client_register+0x144/0x1e0 drivers/gpu/drm/drm_client.c:140 > > drm_fbdev_client_setup+0x1a4/0x39c drivers/gpu/drm/drm_fbdev_cli= ent.c:158 > > drm_client_setup+0x28/0x9c drivers/gpu/drm/drm_client_setup.c:29 > > vkms_create drivers/gpu/drm/vkms/vkms_drv.c:230 [inline] > > vkms_init+0x4f0/0x600 drivers/gpu/drm/vkms/vkms_drv.c:256 > > do_one_initcall+0x254/0x9f8 init/main.c:1266 > > do_initcall_level+0x154/0x214 init/main.c:1328 > > do_initcalls+0x58/0xac init/main.c:1344 > > do_basic_setup+0x8c/0xa0 init/main.c:1363 > > kernel_init_freeable+0x324/0x478 init/main.c:1577 > > kernel_init+0x24/0x2a0 init/main.c:1466 > > ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 > > > > -> #5 (&helper->lock){+.+.}-{4:4}: > > __mutex_lock_common+0x218/0x28f4 kernel/locking/mutex.c:585 > > __mutex_lock kernel/locking/mutex.c:735 [inline] > > mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:787 > > __drm_fb_helper_restore_fbdev_mode_unlocked+0xb4/0x178 drivers/g= pu/drm/drm_fb_helper.c:228 > > drm_fb_helper_set_par+0xc4/0x110 drivers/gpu/drm/drm_fb_helper.c= :1351 > > fbcon_init+0xf34/0x1eb8 drivers/video/fbdev/core/fbcon.c:1113 > > visual_init+0x27c/0x548 drivers/tty/vt/vt.c:1011 > > do_bind_con_driver+0x7dc/0xe04 drivers/tty/vt/vt.c:3833 > > do_take_over_console+0x4ac/0x5f0 drivers/tty/vt/vt.c:4399 > > do_fbcon_takeover+0x158/0x260 drivers/video/fbdev/core/fbcon.c:5= 49 > > do_fb_registered drivers/video/fbdev/core/fbcon.c:2988 [inline] > > fbcon_fb_registered+0x370/0x4ec drivers/video/fbdev/core/fbcon.c= :3008 > > do_register_framebuffer drivers/video/fbdev/core/fbmem.c:449 [in= line] > > register_framebuffer+0x470/0x610 drivers/video/fbdev/core/fbmem.= c:515 > > __drm_fb_helper_initial_config_and_unlock+0x137c/0x1910 drivers/= gpu/drm/drm_fb_helper.c:1841 > > drm_fb_helper_initial_config+0x48/0x64 drivers/gpu/drm/drm_fb_he= lper.c:1906 > > drm_fbdev_client_hotplug+0x158/0x22c drivers/gpu/drm/drm_fbdev_c= lient.c:51 > > drm_client_register+0x144/0x1e0 drivers/gpu/drm/drm_client.c:140 > > drm_fbdev_client_setup+0x1a4/0x39c drivers/gpu/drm/drm_fbdev_cli= ent.c:158 > > drm_client_setup+0x28/0x9c drivers/gpu/drm/drm_client_setup.c:29 > > vkms_create drivers/gpu/drm/vkms/vkms_drv.c:230 [inline] > > vkms_init+0x4f0/0x600 drivers/gpu/drm/vkms/vkms_drv.c:256 > > do_one_initcall+0x254/0x9f8 init/main.c:1266 > > do_initcall_level+0x154/0x214 init/main.c:1328 > > do_initcalls+0x58/0xac init/main.c:1344 > > do_basic_setup+0x8c/0xa0 init/main.c:1363 > > kernel_init_freeable+0x324/0x478 init/main.c:1577 > > kernel_init+0x24/0x2a0 init/main.c:1466 > > ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 > > > > -> #4 (console_lock){+.+.}-{0:0}: > > console_lock+0x19c/0x1f4 kernel/printk/printk.c:2833 > > __bch2_print_string_as_lines fs/bcachefs/util.c:267 [inline] > > bch2_print_string_as_lines+0x2c/0xd4 fs/bcachefs/util.c:286 > > __bch2_fsck_err+0x1864/0x2544 fs/bcachefs/error.c:411 > > bch2_check_fix_ptr fs/bcachefs/buckets.c:112 [inline] > > bch2_check_fix_ptrs+0x15b8/0x515c fs/bcachefs/buckets.c:266 > > bch2_trigger_extent+0x71c/0x814 fs/bcachefs/buckets.c:856 > > bch2_key_trigger fs/bcachefs/bkey_methods.h:87 [inline] > > bch2_gc_mark_key+0x4b4/0xb70 fs/bcachefs/btree_gc.c:634 > > bch2_gc_btree fs/bcachefs/btree_gc.c:670 [inline] > > bch2_gc_btrees fs/bcachefs/btree_gc.c:729 [inline] > > bch2_check_allocations+0x1018/0x48f4 fs/bcachefs/btree_gc.c:1133 > > bch2_run_recovery_pass+0xe4/0x1d4 fs/bcachefs/recovery_passes.c:= 191 > > bch2_run_recovery_passes+0x30c/0x73c fs/bcachefs/recovery_passes= .c:244 > > bch2_fs_recovery+0x32d8/0x55dc fs/bcachefs/recovery.c:861 > > bch2_fs_start+0x30c/0x53c fs/bcachefs/super.c:1037 > > bch2_fs_get_tree+0x938/0x1030 fs/bcachefs/fs.c:2170 > > vfs_get_tree+0x90/0x28c fs/super.c:1814 > > do_new_mount+0x278/0x900 fs/namespace.c:3507 > > path_mount+0x590/0xe04 fs/namespace.c:3834 > > do_mount fs/namespace.c:3847 [inline] > > __do_sys_mount fs/namespace.c:4057 [inline] > > __se_sys_mount fs/namespace.c:4034 [inline] > > __arm64_sys_mount+0x4d4/0x5ac fs/namespace.c:4034 > > __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] > > invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 > > el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 > > do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 > > el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 > > el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c= :762 > > el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 > > > > -> #3 (&c->fsck_error_msgs_lock){+.+.}-{4:4}: > > __mutex_lock_common+0x218/0x28f4 kernel/locking/mutex.c:585 > > __mutex_lock kernel/locking/mutex.c:735 [inline] > > mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:787 > > __bch2_fsck_err+0x344/0x2544 fs/bcachefs/error.c:282 > > bch2_check_fix_ptr fs/bcachefs/buckets.c:112 [inline] > > bch2_check_fix_ptrs+0x15b8/0x515c fs/bcachefs/buckets.c:266 > > bch2_trigger_extent+0x71c/0x814 fs/bcachefs/buckets.c:856 > > bch2_key_trigger fs/bcachefs/bkey_methods.h:87 [inline] > > bch2_gc_mark_key+0x4b4/0xb70 fs/bcachefs/btree_gc.c:634 > > bch2_gc_btree fs/bcachefs/btree_gc.c:670 [inline] > > bch2_gc_btrees fs/bcachefs/btree_gc.c:729 [inline] > > bch2_check_allocations+0x1018/0x48f4 fs/bcachefs/btree_gc.c:1133 > > bch2_run_recovery_pass+0xe4/0x1d4 fs/bcachefs/recovery_passes.c:= 191 > > bch2_run_recovery_passes+0x30c/0x73c fs/bcachefs/recovery_passes= .c:244 > > bch2_fs_recovery+0x32d8/0x55dc fs/bcachefs/recovery.c:861 > > bch2_fs_start+0x30c/0x53c fs/bcachefs/super.c:1037 > > bch2_fs_get_tree+0x938/0x1030 fs/bcachefs/fs.c:2170 > > vfs_get_tree+0x90/0x28c fs/super.c:1814 > > do_new_mount+0x278/0x900 fs/namespace.c:3507 > > path_mount+0x590/0xe04 fs/namespace.c:3834 > > do_mount fs/namespace.c:3847 [inline] > > __do_sys_mount fs/namespace.c:4057 [inline] > > __se_sys_mount fs/namespace.c:4034 [inline] > > __arm64_sys_mount+0x4d4/0x5ac fs/namespace.c:4034 > > __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] > > invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 > > el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 > > do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 > > el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 > > el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c= :762 > > el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 > > > > -> #2 (&c->mark_lock){++++}-{0:0}: > > percpu_down_read+0x5c/0x2e8 include/linux/percpu-rwsem.h:51 > > __bch2_disk_reservation_add+0xc4/0x9f4 fs/bcachefs/buckets.c:117= 0 > > bch2_disk_reservation_add+0x29c/0x4f4 fs/bcachefs/buckets.h:367 > > __bch2_folio_reservation_get+0x2dc/0x798 fs/bcachefs/fs-io-pagec= ache.c:428 > > bch2_folio_reservation_get fs/bcachefs/fs-io-pagecache.c:477 [in= line] > > bch2_page_mkwrite+0xa70/0xe44 fs/bcachefs/fs-io-pagecache.c:637 > > do_page_mkwrite+0x140/0x2dc mm/memory.c:3176 > > wp_page_shared mm/memory.c:3577 [inline] > > do_wp_page+0x1f50/0x38a0 mm/memory.c:3727 > > handle_pte_fault+0xe44/0x5890 mm/memory.c:5817 > > __handle_mm_fault mm/memory.c:5944 [inline] > > handle_mm_fault+0xf0c/0x17b0 mm/memory.c:6112 > > do_page_fault+0x404/0x10a8 arch/arm64/mm/fault.c:647 > > do_mem_abort+0x74/0x200 arch/arm64/mm/fault.c:919 > > el0_da+0x60/0x178 arch/arm64/kernel/entry-common.c:604 > > el0t_64_sync_handler+0xcc/0x108 arch/arm64/kernel/entry-common.c= :765 > > el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 > > > > -> #1 (sb_pagefaults#4){.+.+}-{0:0}: > > percpu_down_read include/linux/percpu-rwsem.h:51 [inline] > > __sb_start_write include/linux/fs.h:1725 [inline] > > sb_start_pagefault include/linux/fs.h:1890 [inline] > > bch2_page_mkwrite+0x280/0xe44 fs/bcachefs/fs-io-pagecache.c:614 > > do_page_mkwrite+0x140/0x2dc mm/memory.c:3176 > > wp_page_shared mm/memory.c:3577 [inline] > > do_wp_page+0x1f50/0x38a0 mm/memory.c:3727 > > handle_pte_fault+0xe44/0x5890 mm/memory.c:5817 > > __handle_mm_fault mm/memory.c:5944 [inline] > > handle_mm_fault+0xf0c/0x17b0 mm/memory.c:6112 > > do_page_fault+0x404/0x10a8 arch/arm64/mm/fault.c:647 > > do_mem_abort+0x74/0x200 arch/arm64/mm/fault.c:919 > > el0_da+0x60/0x178 arch/arm64/kernel/entry-common.c:604 > > el0t_64_sync_handler+0xcc/0x108 arch/arm64/kernel/entry-common.c= :765 > > el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 > > > > -> #0 (&vma->vm_lock->lock){++++}-{4:4}: > > check_prev_add kernel/locking/lockdep.c:3161 [inline] > > check_prevs_add kernel/locking/lockdep.c:3280 [inline] > > validate_chain kernel/locking/lockdep.c:3904 [inline] > > __lock_acquire+0x34f0/0x7904 kernel/locking/lockdep.c:5226 > > lock_acquire+0x23c/0x724 kernel/locking/lockdep.c:5849 > > down_write+0x50/0xc0 kernel/locking/rwsem.c:1577 > > vma_start_write include/linux/mm.h:769 [inline] > > vm_flags_set include/linux/mm.h:899 [inline] > > vm_insert_page+0x2a0/0xab0 mm/memory.c:2241 > > packet_mmap+0x2f8/0x4c8 net/packet/af_packet.c:4680 > > sock_mmap+0x90/0xa8 net/socket.c:1403 > > call_mmap include/linux/fs.h:2183 [inline] > > mmap_file mm/internal.h:124 [inline] > > __mmap_new_file_vma mm/vma.c:2291 [inline] > > __mmap_new_vma mm/vma.c:2355 [inline] > > __mmap_region+0x1854/0x2180 mm/vma.c:2456 > > mmap_region+0x1f4/0x370 mm/mmap.c:1348 > > do_mmap+0x8b0/0xfd0 mm/mmap.c:496 > > vm_mmap_pgoff+0x1a0/0x38c mm/util.c:580 > > ksys_mmap_pgoff+0x3a4/0x5c8 mm/mmap.c:542 > > __do_sys_mmap arch/arm64/kernel/sys.c:28 [inline] > > __se_sys_mmap arch/arm64/kernel/sys.c:21 [inline] > > __arm64_sys_mmap+0xf8/0x110 arch/arm64/kernel/sys.c:21 > > __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] > > invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 > > el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 > > do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 > > el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 > > el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c= :762 > > el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 > > > > other info that might help us debug this: > > > > Chain exists of: > > &vma->vm_lock->lock --> &mm->mmap_lock --> &po->pg_vec_lock > > > > Possible unsafe locking scenario: > > > > CPU0 CPU1 > > ---- ---- > > lock(&po->pg_vec_lock); > > lock(&mm->mmap_lock); > > lock(&po->pg_vec_lock); > > lock(&vma->vm_lock->lock); > > > > *** DEADLOCK *** > > > > 2 locks held by syz.8.396/8273: > > #0: ffff0000d6a2cc10 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock= _killable include/linux/mmap_lock.h:122 [inline] > > #0: ffff0000d6a2cc10 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0= x154/0x38c mm/util.c:578 > > #1: ffff0000d4aa2868 (&po->pg_vec_lock){+.+.}-{4:4}, at: packet_mmap+0= x9c/0x4c8 net/packet/af_packet.c:4650 > > > Given &mm->mmap_lock and &po->pg_vec_lock in same locking order on both s= ides, > this deadlock report is bogus. Due to lockdep glitch? Yeah, this looks fishy. Note that to write-lock vma->vm_lock (which is what's done here) a task needs to also hold the mmap_write_lock, so the above race between CPU0 and CPU1 should not be possible because they will synchronize on the mmap_lock before locking vm_lock or pg_vec_lock. > > > stack backtrace: > > CPU: 0 UID: 0 PID: 8273 Comm: syz.8.396 Not tainted 6.13.0-rc3-syzkalle= r-g573067a5a685 #0 > > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS= Google 09/13/2024 > > Call trace: > > show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (C) > > __dump_stack lib/dump_stack.c:94 [inline] > > dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120 > > dump_stack+0x1c/0x28 lib/dump_stack.c:129 > > print_circular_bug+0x154/0x1c0 kernel/locking/lockdep.c:2074 > > check_noncircular+0x310/0x404 kernel/locking/lockdep.c:2206 > > check_prev_add kernel/locking/lockdep.c:3161 [inline] > > check_prevs_add kernel/locking/lockdep.c:3280 [inline] > > validate_chain kernel/locking/lockdep.c:3904 [inline] > > __lock_acquire+0x34f0/0x7904 kernel/locking/lockdep.c:5226 > > lock_acquire+0x23c/0x724 kernel/locking/lockdep.c:5849 > > down_write+0x50/0xc0 kernel/locking/rwsem.c:1577 > > vma_start_write include/linux/mm.h:769 [inline] > > vm_flags_set include/linux/mm.h:899 [inline] > > vm_insert_page+0x2a0/0xab0 mm/memory.c:2241 > > packet_mmap+0x2f8/0x4c8 net/packet/af_packet.c:4680 > > sock_mmap+0x90/0xa8 net/socket.c:1403 > > call_mmap include/linux/fs.h:2183 [inline] > > mmap_file mm/internal.h:124 [inline] > > __mmap_new_file_vma mm/vma.c:2291 [inline] > > __mmap_new_vma mm/vma.c:2355 [inline] > > __mmap_region+0x1854/0x2180 mm/vma.c:2456 > > mmap_region+0x1f4/0x370 mm/mmap.c:1348 > > do_mmap+0x8b0/0xfd0 mm/mmap.c:496 > > vm_mmap_pgoff+0x1a0/0x38c mm/util.c:580 > > ksys_mmap_pgoff+0x3a4/0x5c8 mm/mmap.c:542 > > __do_sys_mmap arch/arm64/kernel/sys.c:28 [inline] > > __se_sys_mmap arch/arm64/kernel/sys.c:21 [inline] > > __arm64_sys_mmap+0xf8/0x110 arch/arm64/kernel/sys.c:21 > > __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] > > invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 > > el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 > > do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 > > el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 > > el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 > > el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 > > > > > > --- > > This report is generated by a bot. It may contain errors. > > See https://goo.gl/tpsmEJ for more information about syzbot. > > syzbot engineers can be reached at syzkaller@googlegroups.com. > > > > syzbot will keep track of this issue. See: > > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > > > > If the report is already addressed, let syzbot know by replying with: > > #syz fix: exact-commit-title > > > > If you want to overwrite report's subsystems, reply with: > > #syz set subsystems: new-subsystem > > (See the list of subsystem names on the web dashboard) > > > > If the report is a duplicate of another one, reply with: > > #syz dup: exact-subject-of-another-report > > > > If you want to undo deduplication, reply with: > > #syz undup > > >