From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-io1-f78.google.com (mail-io1-f78.google.com [209.85.166.78]) (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 839632309B9 for ; Thu, 28 Aug 2025 14:25:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.78 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756391136; cv=none; b=JulRidbWGXjRzvvpyVaWkbLAg8UXWcKu99gdYA4wWOASFig8yZPkfbZlIfH8werQ+8HVztswATWJpIhjDf2Mi2R8PdMLKFatod3XCVx1RWgzf4gQ7t5ROIa2PholGVFYBvFDPboPpIYgaD7l/5ef2PlAkqzLIBFryxtKLVejT1E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756391136; c=relaxed/simple; bh=or4ymz+8rapxhUcqnPZhNyzaZe3k0OTQofWc3oLIz6k=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=YHOulDTicGxTqfCD7bD1zt9CnoeiqEnk1REVjdcgB4iDvkxSkOPDFIxJyFCf6ryQrlH7GKDKJWsgLwtbiG3Sbc4iJ2HC7GtP2RctDa5yvZyC1vJDIumJzyO+9fYBSJl1C/i4s3NI4a2tyNiQWFXdEvE3F0yJxu+2kl/+7acn/Tk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.166.78 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-io1-f78.google.com with SMTP id ca18e2360f4ac-886e162de4dso123793339f.1 for ; Thu, 28 Aug 2025 07:25:34 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1756391134; x=1756995934; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=X401dxTztD/h02Lx3lrqLzK2dweQNmNnv6bEtQK8+EM=; b=T5qqZQuM+NcOdViyu7i3AidU5PAtwq5tDGLo1LT557HyJG0j3GRIzFVhGNXJNDzcdA /xw1nMx+zJCqoVCzUXDFnbrtSjiupTzhlkn3DRzdFQsH4DmXxkgiLUnwoTCQIVC1UVJM 0vqrWho8KpR2HH0tjXvSBRFFNzf/Bm9vX9Zvuh62eRVfGyZru+0aG70Abvzjsk1WjNpK RbkiAtbDPLqLjhFS/jhhQRrzLMrI9mgc8mRa8r3/EF+Y5HW0EPiEAotEtwD1WjUL1uyU hKaTH97aZBcJWEvZla9SG9FkFwbjjJX2RvFwhofCxxnRuPJKi9/vUvvdTwC1AA8Eq2zr 5oDw== X-Forwarded-Encrypted: i=1; AJvYcCXVzp7+0d4s/kidchGjVGuMU+JPEqIq4rhIYDIxGpGiZ+FJTEyRkEbfr3mlkquZ10VGYb8=@vger.kernel.org X-Gm-Message-State: AOJu0YxPloUFTVp37yaNuBTNyT1zglr10QAYpOvHsMWxOdN4VLjE2IhY wIL16/CCKTygmbaZu64nfT9c26WcpdZuhqkYlmBLDvYABFgbRe1cQznb7xigPOI/6Ee1T15M9DF IqtMb8/2RrUUbzW8xCm/n9Gr9lWh2jjku1DB79CCDIRGeoZ5vTH0wxhIDJBs= X-Google-Smtp-Source: AGHT+IF1JahB34Nzk8euvUaM8Fb3n8wWejPb8okot3E4s8ziUB2BctW//TxhVGjZgwBudcF+W5C7c9VLwAl8RNMreZuRKAXETc46 Precedence: bulk X-Mailing-List: rcu@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:4617:b0:3ea:d47f:5995 with SMTP id e9e14a558f8ab-3ef08764393mr130298875ab.11.1756391133708; Thu, 28 Aug 2025 07:25:33 -0700 (PDT) Date: Thu, 28 Aug 2025 07:25:33 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68b066dd.a70a0220.f8cc2.007b.GAE@google.com> Subject: [syzbot] [rcu?] BUG: unable to handle kernel paging request in rcu_cblist_dequeue From: syzbot To: boqun.feng@gmail.com, frederic@kernel.org, jiangshanlai@gmail.com, joelagnelf@nvidia.com, josh@joshtriplett.org, linux-kernel@vger.kernel.org, mathieu.desnoyers@efficios.com, neeraj.upadhyay@kernel.org, paulmck@kernel.org, qiang.zhang@linux.dev, rcu@vger.kernel.org, rostedt@goodmis.org, syzkaller-bugs@googlegroups.com, urezki@gmail.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 8f5ae30d69d7 Linux 6.17-rc1 git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=1617e634580000 kernel config: https://syzkaller.appspot.com/x/.config?x=8c5ac3d8b8abfcb dashboard link: https://syzkaller.appspot.com/bug?extid=dfae5535e0da40eb9879 compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 userspace arch: arm64 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/18a2e4bd0c4a/disk-8f5ae30d.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/3b5395881b25/vmlinux-8f5ae30d.xz kernel image: https://storage.googleapis.com/syzbot-assets/e875f4e3b7ff/Image-8f5ae30d.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+dfae5535e0da40eb9879@syzkaller.appspotmail.com Unable to handle kernel paging request at virtual address ffff3ff7ee0a2600 KASAN: maybe wild-memory-access in range [0xfffdffbf70513000-0xfffdffbf70513007] Mem abort info: ESR = 0x0000000096000004 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x04: level 0 translation fault Data abort info: ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000000206ec9000 [ffff3ff7ee0a2600] pgd=0000000000000000, p4d=0000000000000000 Internal error: Oops: 0000000096000004 [#1] SMP Modules linked in: CPU: 0 UID: 0 PID: 1816 Comm: kworker/0:2 Not tainted 6.17.0-rc1-syzkaller-g8f5ae30d69d7 #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 Workqueue: rcu_gp srcu_invoke_callbacks pstate: 03400005 (nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : rcu_cblist_dequeue+0x68/0xc8 kernel/rcu/rcu_segcblist.c:75 lr : srcu_invoke_callbacks+0x198/0x394 kernel/rcu/srcutree.c:1802 sp : ffff80009f9c7960 x29: ffff80009f9c7960 x28: ffff80009f9c79c0 x27: dfff800000000000 x26: ffff0000c5a5a918 x25: ffff0000c1092800 x24: fffffdffbf6e0e40 x23: 1ffff00013f38f3c x22: dfff800000000000 x21: ffff80009f9c79f0 x20: fffdffbf70513000 x19: ffff80009f9c79e0 x18: 0000000000000000 x17: ffff80010c5d9000 x16: ffff8000805293e8 x15: 0000000000000001 x14: 1fffffbff7edc1c8 x13: 0000000000000000 x12: 0000000000000000 x11: ffff800093306be8 x10: 0000000000000001 x9 : 1fffbff7ee0a2600 x8 : 0000000000000000 x7 : ffff8000805b4130 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000001 x3 : 0000000000000010 x2 : 0000000000000006 x1 : ffff80008edc258c x0 : ffff80009f9c79e0 Call trace: rcu_cblist_dequeue+0x68/0xc8 kernel/rcu/rcu_segcblist.c:74 (P) srcu_invoke_callbacks+0x198/0x394 kernel/rcu/srcutree.c:1802 process_one_work+0x7e8/0x155c kernel/workqueue.c:3236 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x958/0xed8 kernel/workqueue.c:3400 kthread+0x5fc/0x75c kernel/kthread.c:463 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844 Code: f94002a8 d343fe89 d1000508 f90002a8 (38766928) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: f94002a8 ldr x8, [x21] 4: d343fe89 lsr x9, x20, #3 8: d1000508 sub x8, x8, #0x1 c: f90002a8 str x8, [x21] * 10: 38766928 ldrb w8, [x9, x22] <-- trapping instruction --- 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