From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-io1-f69.google.com (mail-io1-f69.google.com [209.85.166.69]) (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 144483D994 for ; Sun, 14 Apr 2024 11:10:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.69 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713093028; cv=none; b=rR+zbtVa+5m2pYgVyLCoXPjFiVphSkTCNZIlpSh26Uft8FcZ9hhzKPKxLVDL8WJ4UtSQ9hdcIS3qOp6eC/cr9c+JvWhPgABnPr27NEVDFV3/bnLFPsh5WT3QM7tJ1WqiuFE/7wpliCYWPc7BhhaXHJVdyhAtuDieIHgGogk5OLg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713093028; c=relaxed/simple; bh=UuKeL2WcKRgqctSvEjKmBd6lMthB3+vcPL4dW8Jv3VY=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=oPnS4VJT8kfqGZ18zLyMtTfk5VnqJ19Kk7rvpmBVOqV3WIUfq7x5dfyVocSPmuZGCwSmjLQOQu0mOWepcr9uEj9yDcOfXD4n3jS/YXijFBG2uhXPg8O0ukaOjA9ntVZNmWrkO6lTY912scEica30aoewYagu5gn3I7JAFyEwf8I= 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=209.85.166.69 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-f69.google.com with SMTP id ca18e2360f4ac-7d676654767so285920839f.3 for ; Sun, 14 Apr 2024 04:10:26 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1713093026; x=1713697826; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=YzmnxBjAYY26fFmUATQM9LcK9BACkrZL6MSaQ18rFTA=; b=sFJkTuYnDpe0ifae/exTx5uHBOcrAqtAY4bJTUXT3aqnjskgbOq1tVLPHGMeHw9IHc xZbnC9l9UPf7I7goCK5lU95fAhhYz47sYJLie0F8VmCiFvgZCd8FfBLMIz2WoMe6cN6h H/lS/sqYvWX4q5a3RdSezaXTc0p8pAXASC+EEbs+DBjdevyfwNU8yqSZ166l3aSjZs8X oNm2m2A3HfkaYRq24gHvcNuD0vyXTX6AdvtUDxHvImLnqzqGlo/UGMmnukA3XUq+WX6X JEKUwI+38kBSRLR5yRgEgN1ZkQ8CCBpVix/nHFNYkRjOvd95LHIyqpie7gu9w2EEJ795 IK/A== X-Forwarded-Encrypted: i=1; AJvYcCV1dxkI4q3XILYxQTa1XA7IllQiCNOeudUEb4JzgGJLhBpFZwOj4ACv66Kba31EJX1gh/OpVGsilVxxNLaFTPyommJLaJtiWAQoXr+S X-Gm-Message-State: AOJu0YwJ8AR1LeOg+kjNy6DaPyxZe6P08rwe6aUSfn/lXZdLna3TG4Cu PBnP+U61CyueYJIKBJ+ruzS4rbxbzACWxX7z68yaOjNjhAKXVpikZMZzhzspk1RyQ41YjM8P5Z9 hG4ZVckZ06/YfSoW46nAaI7nSMyO/ntEXhu/hiO0KUM9RrYjNmzFr48g= X-Google-Smtp-Source: AGHT+IGxQxMusWloR5gS9iI5uuVX6/hg0xZUr/CXJrEZQv4+AzJ/A6Tf+txuVVShPLp7owE02/dTU9uIQW8lIgNVHT+XWrgbOw63 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6602:3420:b0:7d0:ad03:af0b with SMTP id n32-20020a056602342000b007d0ad03af0bmr229319ioz.2.1713093026304; Sun, 14 Apr 2024 04:10:26 -0700 (PDT) Date: Sun, 14 Apr 2024 04:10:26 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000004cf0fe06160c8d71@google.com> Subject: [syzbot] [bpf?] KMSAN: uninit-value in htab_percpu_map_lookup_elem From: syzbot To: andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, eddyz87@gmail.com, haoluo@google.com, john.fastabend@gmail.com, jolsa@kernel.org, kpsingh@kernel.org, linux-kernel@vger.kernel.org, martin.lau@linux.dev, sdf@google.com, song@kernel.org, syzkaller-bugs@googlegroups.com, yonghong.song@linux.dev Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 2c71fdf02a95 Merge tag 'drm-fixes-2024-04-09' of https://g.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=170425a1180000 kernel config: https://syzkaller.appspot.com/x/.config?x=b5bc506ebba90cbf dashboard link: https://syzkaller.appspot.com/bug?extid=0a079d6ef3831217a230 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16abe213180000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16ab97ad180000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/36c01edd4b1e/disk-2c71fdf0.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/7df598a3dceb/vmlinux-2c71fdf0.xz kernel image: https://storage.googleapis.com/syzbot-assets/678bacfb883c/bzImage-2c71fdf0.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+0a079d6ef3831217a230@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in __htab_map_lookup_elem kernel/bpf/hashtab.c:691 [inline] BUG: KMSAN: uninit-value in htab_percpu_map_lookup_elem+0x3eb/0x4f0 kernel/bpf/hashtab.c:2302 __htab_map_lookup_elem kernel/bpf/hashtab.c:691 [inline] htab_percpu_map_lookup_elem+0x3eb/0x4f0 kernel/bpf/hashtab.c:2302 ____bpf_map_lookup_elem kernel/bpf/helpers.c:42 [inline] bpf_map_lookup_elem+0x5c/0x80 kernel/bpf/helpers.c:38 ___bpf_prog_run+0x13fe/0xe0f0 kernel/bpf/core.c:1997 __bpf_prog_run32+0xb2/0xe0 kernel/bpf/core.c:2236 bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline] __bpf_prog_run include/linux/filter.h:657 [inline] bpf_prog_run include/linux/filter.h:664 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline] bpf_trace_run4+0x150/0x340 kernel/trace/bpf_trace.c:2422 __bpf_trace_mm_page_alloc+0x37/0x50 include/trace/events/kmem.h:177 trace_mm_page_alloc include/trace/events/kmem.h:177 [inline] __alloc_pages+0xdc0/0xe70 mm/page_alloc.c:4597 alloc_pages_mpol+0x299/0x990 mm/mempolicy.c:2264 vma_alloc_folio+0x418/0x680 mm/mempolicy.c:2303 wp_page_copy mm/memory.c:3263 [inline] do_wp_page+0x196c/0x66e0 mm/memory.c:3660 handle_pte_fault mm/memory.c:5316 [inline] __handle_mm_fault mm/memory.c:5441 [inline] handle_mm_fault+0x5b76/0xce00 mm/memory.c:5606 do_user_addr_fault arch/x86/mm/fault.c:1362 [inline] handle_page_fault arch/x86/mm/fault.c:1505 [inline] exc_page_fault+0x419/0x730 arch/x86/mm/fault.c:1563 asm_exc_page_fault+0x2b/0x30 arch/x86/include/asm/idtentry.h:623 Local variable stack created at: __bpf_prog_run32+0x43/0xe0 kernel/bpf/core.c:2236 bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline] __bpf_prog_run include/linux/filter.h:657 [inline] bpf_prog_run include/linux/filter.h:664 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline] bpf_trace_run4+0x150/0x340 kernel/trace/bpf_trace.c:2422 CPU: 0 PID: 5021 Comm: syz-executor180 Not tainted 6.9.0-rc3-syzkaller-00023-g2c71fdf02a95 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 ===================================================== --- 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 syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. 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