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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 56060C433EF for ; Sun, 10 Oct 2021 05:48:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 25CE360EE7 for ; Sun, 10 Oct 2021 05:48:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230180AbhJJFuQ (ORCPT ); Sun, 10 Oct 2021 01:50:16 -0400 Received: from mail-io1-f71.google.com ([209.85.166.71]:38639 "EHLO mail-io1-f71.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230237AbhJJFuP (ORCPT ); Sun, 10 Oct 2021 01:50:15 -0400 Received: by mail-io1-f71.google.com with SMTP id m7-20020a6b7b47000000b005dc506c5e04so5997363iop.5 for ; Sat, 09 Oct 2021 22:48:17 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=vnylaAlek/RnETPU/gLVv7pkFuQefb+xmD8wuU/Fupw=; b=M3W5t7q3BwJA5dZeOtXFP+43/GYq/NQzrIkmMIX7AjkR8H5Qc4AcE5W3NUIqc2GMLi /ax8uJfceDR68AUmjVISbsmXdtlkZ677SyWF1NOJVtEpQHV7e+4an3UspEz86A+bblIx xXRiFrtvO+UK2AlSvkeP6CTFwXnGrEPK+xuWjedwhYAsu2L/iHwMJS6Y9OrTMyCD4hWG +9yjHgIYv0Jb8nU5EvSEC7mrG5Xmkq+n5NDTOJnfLIfDAD2r0r3679gEpKz4wyHdwQwa PpCSpSXKmUDdCiji133sxyTIsjVSMyfQsDNGs3fMItZ9T8uSv3VQbFVhz5rko+AX3vOx HZCQ== X-Gm-Message-State: AOAM532rW9qcLdYnXDUeWUBXNjxyBfsGe6qBSeQb93s3mPoqjxmHMwAJ +hO0ph2VR/wNN2Wgzwg0Fcxr5NIa1z2j2A9tQbF7S98HBL8Y X-Google-Smtp-Source: ABdhPJy4XStPum9lPNXCXOp5SF7t26m6SzT4V7I5Kn8xHmMymQHjMiHrtBW3zWexzRaXSupAeNZE50N3S03Spdz9S+3bIqGfSpLd MIME-Version: 1.0 X-Received: by 2002:a92:1a10:: with SMTP id a16mr13485130ila.116.1633844897437; Sat, 09 Oct 2021 22:48:17 -0700 (PDT) Date: Sat, 09 Oct 2021 22:48:17 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000baddc805cdf928c3@google.com> Subject: [syzbot] KMSAN: uninit-value in p9pdu_readf From: syzbot To: asmadeus@codewreck.org, davem@davemloft.net, ericvh@gmail.com, glider@google.com, kuba@kernel.org, linux-kernel@vger.kernel.org, lucho@ionkov.net, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, v9fs-developer@lists.sourceforge.net Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: c7f84f4e1147 kmsan: core: do not touch interrupts when ent.. git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=118e86a8b00000 kernel config: https://syzkaller.appspot.com/x/.config?x=978f1b2d7a5aad3e dashboard link: https://syzkaller.appspot.com/bug?extid=06472778c97ed94af66d compiler: clang version 14.0.0 (git@github.com:llvm/llvm-project.git 0996585c8e3b3d409494eb5f1cad714b9e1f7fb5), GNU ld (GNU Binutils for Debian) 2.35.2 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+06472778c97ed94af66d@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in p9pdu_vreadf net/9p/protocol.c:147 [inline] BUG: KMSAN: uninit-value in p9pdu_readf+0x46cf/0x4fc0 net/9p/protocol.c:526 p9pdu_vreadf net/9p/protocol.c:147 [inline] p9pdu_readf+0x46cf/0x4fc0 net/9p/protocol.c:526 p9pdu_vreadf net/9p/protocol.c:198 [inline] p9pdu_readf+0x2080/0x4fc0 net/9p/protocol.c:526 p9_client_stat+0x2b3/0x710 net/9p/client.c:1724 v9fs_mount+0xc14/0x12c0 fs/9p/vfs_super.c:170 legacy_get_tree+0x163/0x2e0 fs/fs_context.c:610 vfs_get_tree+0xd8/0x5d0 fs/super.c:1498 do_new_mount+0x7bc/0x1680 fs/namespace.c:2988 path_mount+0x106f/0x2960 fs/namespace.c:3318 do_mount fs/namespace.c:3331 [inline] __do_sys_mount fs/namespace.c:3539 [inline] __se_sys_mount+0x8eb/0xa10 fs/namespace.c:3516 __ia32_sys_mount+0x157/0x1b0 fs/namespace.c:3516 do_syscall_32_irqs_on arch/x86/entry/common.c:114 [inline] __do_fast_syscall_32+0x96/0xf0 arch/x86/entry/common.c:180 do_fast_syscall_32+0x34/0x70 arch/x86/entry/common.c:205 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:248 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c Local variable ----ecode@p9_check_errors created at: p9_check_errors+0x68/0xb90 net/9p/client.c:506 p9_client_rpc+0xd90/0x1410 net/9p/client.c:801 ===================================================== Kernel panic - not syncing: panic_on_kmsan set ... CPU: 0 PID: 31201 Comm: syz-executor.3 Tainted: G B W 5.15.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1ff/0x28e lib/dump_stack.c:106 dump_stack+0x25/0x28 lib/dump_stack.c:113 panic+0x44f/0xdeb kernel/panic.c:232 kmsan_report+0x2ee/0x300 mm/kmsan/report.c:168 __msan_warning+0xa9/0xf0 mm/kmsan/instrumentation.c:199 p9pdu_vreadf net/9p/protocol.c:147 [inline] p9pdu_readf+0x46cf/0x4fc0 net/9p/protocol.c:526 p9pdu_vreadf net/9p/protocol.c:198 [inline] p9pdu_readf+0x2080/0x4fc0 net/9p/protocol.c:526 p9_client_stat+0x2b3/0x710 net/9p/client.c:1724 v9fs_mount+0xc14/0x12c0 fs/9p/vfs_super.c:170 legacy_get_tree+0x163/0x2e0 fs/fs_context.c:610 vfs_get_tree+0xd8/0x5d0 fs/super.c:1498 do_new_mount+0x7bc/0x1680 fs/namespace.c:2988 path_mount+0x106f/0x2960 fs/namespace.c:3318 do_mount fs/namespace.c:3331 [inline] __do_sys_mount fs/namespace.c:3539 [inline] __se_sys_mount+0x8eb/0xa10 fs/namespace.c:3516 __ia32_sys_mount+0x157/0x1b0 fs/namespace.c:3516 do_syscall_32_irqs_on arch/x86/entry/common.c:114 [inline] __do_fast_syscall_32+0x96/0xf0 arch/x86/entry/common.c:180 do_fast_syscall_32+0x34/0x70 arch/x86/entry/common.c:205 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:248 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf6ef3549 Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 RSP: 002b:00000000f44ed5fc EFLAGS: 00000296 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000020000000 RDX: 0000000020000140 RSI: 0000000000000000 RDI: 0000000020000580 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Kernel Offset: disabled Rebooting in 86400 seconds.. ---------------- Code disassembly (best guess): 0: 03 74 c0 01 add 0x1(%rax,%rax,8),%esi 4: 10 05 03 74 b8 01 adc %al,0x1b87403(%rip) # 0x1b8740d a: 10 06 adc %al,(%rsi) c: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 10: 10 07 adc %al,(%rdi) 12: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi 16: 10 08 adc %cl,(%rax) 18: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1c: 00 00 add %al,(%rax) 1e: 00 00 add %al,(%rax) 20: 00 51 52 add %dl,0x52(%rcx) 23: 55 push %rbp 24: 89 e5 mov %esp,%ebp 26: 0f 34 sysenter 28: cd 80 int $0x80 * 2a: 5d pop %rbp <-- trapping instruction 2b: 5a pop %rdx 2c: 59 pop %rcx 2d: c3 retq 2e: 90 nop 2f: 90 nop 30: 90 nop 31: 90 nop 32: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1) 39: 00 00 00 3c: 0f .byte 0xf 3d: 1f (bad) 3e: 44 rex.R --- This report is generated by a bot. 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