From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f199.google.com (mail-il1-f199.google.com [209.85.166.199]) (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 163EF13C9BA for ; Tue, 26 Mar 2024 19:00:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.199 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711479635; cv=none; b=opuMKrwpHMuK61Ql25kryZbgQS+t9knC9qODpozRvLE3ZezRtalV8x4TWPENajV9A6zoJ9sXUGv8teM/yvv7IB4cSZjI2lkru4TVwL6qMCUowO3lPk0fy+WB8sh1ttfl5bgTeMuPIXftjZ8ye5IKU91+Iq0Rq1YfFJ1GQzOcZIA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711479635; c=relaxed/simple; bh=R/mMGKjzQTaooyIF3PJX6TqpXnfMhdRKraYq9NmqNsk=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=qNh6MkmI0Ga6LESNZa63wsnbjyBeX8/Yf44h6acqs+2nNZRNse+vROvSAVU5f5k77zQJpxO9f0a7F+m8TBCWIZuoyT94QuZxuK+7SVt1eTCQ11lMqxb7m4eXGimVp7vnwS5xJfG0OGk1BdnoAfWFbXRr5mAjkbsKARHZO/tLUd0= 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=209.85.166.199 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-il1-f199.google.com with SMTP id e9e14a558f8ab-368a49f06f1so8256085ab.3 for ; Tue, 26 Mar 2024 12:00:23 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1711479623; x=1712084423; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=KwBoSkAexwwZT22uv2xlJaKJZLAqlwLtukfnnb8tOGI=; b=kN/tIeNlDTTxyuyD3Mtj+1DaNdnIXIkglxC30EIKv/ebHh2AEkTK8IA3qI3sSPuxOR FD0xlov1KuWVXlwQVL6KXi7KHuGoQ5tdSxvoVzEYtTfvQH+njfqnQVfS9XtHWIUgBE/c Ev4JD6ZKw+Al9Xe7cPvVuJJpq0gLnRGuOuzdgzl4RAuQtXFsMzFnkqOjBEqrZj3tRZ8B XnVNYns/FXgBcgoSaLePv/cKpHaAX0PwfuQGLMvQAqQLxon0XonaibcIAWCcNYMLlWEI NnZxSpkDwdjOjpKUQ0gmek5+NPnbqKh+BJEBGnxrUn9jlCMQeyxa4x5W+Xs52NUOqOON OzAg== X-Forwarded-Encrypted: i=1; AJvYcCV+wJcPZmiikagI7UbOtiScWfpctPRJ/A3xJHyJ+y4xHQRRnzz5u9UOZyauUsAiBUBK5+h1q8qkiO/3Vjq8zlPMedSv X-Gm-Message-State: AOJu0YyHQR5wt4tqAXhV5uJD4roq7XP5oeZybZ/e/yHKRKITmqSDfn3e dH32cZAnrRivP9FS4tnv+ocoyo9SnUQ35BSsWCsKbXraO4TEx9k8zERLeuvYS7FYptHl7wTr8cz plE1QMbIS8f8ht7H/TlK0d8JcEM/WQXLH8FuCCd05H7Whlz6hIOXFqOc= X-Google-Smtp-Source: AGHT+IEbt0OOJBHB47eYY914zC+CUvv42tj6QW2+e3un017KnOgzAtQXZ/0HgDwYsXQB2nGGcI770tpDfvPN15BZj9JBlXtu+2k9 Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1548:b0:368:8224:d1db with SMTP id j8-20020a056e02154800b003688224d1dbmr168555ilu.4.1711479623105; Tue, 26 Mar 2024 12:00:23 -0700 (PDT) Date: Tue, 26 Mar 2024 12:00:23 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000f9ce6d061494e694@google.com> Subject: [syzbot] [bpf?] KMSAN: uninit-value in trie_delete_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: 4f55aa85a874 Merge tag 'fbdev-for-6.9-rc1' of git://git.ke.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11a8dc6e180000 kernel config: https://syzkaller.appspot.com/x/.config?x=e6bd769cb793b98a dashboard link: https://syzkaller.appspot.com/bug?extid=603bcd9b0bf1d94dbb9b compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/991fcbce770a/disk-4f55aa85.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/bd716e5d2c3c/vmlinux-4f55aa85.xz kernel image: https://storage.googleapis.com/syzbot-assets/bf1151dbf5fc/bzImage-4f55aa85.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+603bcd9b0bf1d94dbb9b@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in trie_delete_elem+0xc0/0xbe0 kernel/bpf/lpm_trie.c:448 trie_delete_elem+0xc0/0xbe0 kernel/bpf/lpm_trie.c:448 ____bpf_map_delete_elem kernel/bpf/helpers.c:77 [inline] bpf_map_delete_elem+0x5c/0x80 kernel/bpf/helpers.c:73 ___bpf_prog_run+0x13fe/0xe0f0 kernel/bpf/core.c:1997 __bpf_prog_run128+0xb5/0xe0 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_run3+0x132/0x320 kernel/trace/bpf_trace.c:2421 __bpf_trace_kmem_cache_free+0x31/0x40 include/trace/events/kmem.h:114 trace_kmem_cache_free include/trace/events/kmem.h:114 [inline] kmem_cache_free+0x6da/0xa80 mm/slub.c:4343 mt_free_one lib/maple_tree.c:172 [inline] mas_destroy+0x56c9/0x5cd0 lib/maple_tree.c:5612 mas_store_prealloc+0x39c/0x550 lib/maple_tree.c:5487 vma_iter_store mm/internal.h:1290 [inline] vma_complete+0x9b0/0x14e0 mm/mmap.c:535 __split_vma+0x1037/0x1200 mm/mmap.c:2385 split_vma mm/mmap.c:2411 [inline] vma_modify+0x37c/0x4c0 mm/mmap.c:2452 vma_modify_flags include/linux/mm.h:3303 [inline] mprotect_fixup+0x790/0x1170 mm/mprotect.c:635 do_mprotect_pkey+0x1159/0x1850 mm/mprotect.c:809 __do_sys_mprotect mm/mprotect.c:830 [inline] __se_sys_mprotect mm/mprotect.c:827 [inline] __ia32_sys_mprotect+0x98/0xf0 mm/mprotect.c:827 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0xba/0x120 arch/x86/entry/common.c:321 do_fast_syscall_32+0x38/0x80 arch/x86/entry/common.c:346 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:384 entry_SYSENTER_compat_after_hwframe+0x7a/0x84 Local variable stack created at: __bpf_prog_run128+0x45/0xe0 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_run3+0x132/0x320 kernel/trace/bpf_trace.c:2421 CPU: 0 PID: 14388 Comm: syz-executor.4 Not tainted 6.8.0-syzkaller-13006-g4f55aa85a874 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 ===================================================== --- 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 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