From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f71.google.com (mail-oo1-f71.google.com [209.85.161.71]) (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 D0970374E5B for ; Thu, 13 Aug 2026 14:17:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.71 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786630660; cv=none; b=KqeUrNlnyiKmiHe6UUNM9lqcHbltPeTMwkSYhzE7IGIzmgVg6M8nG6OoEkvaXHkSGw7A55ch+Q+L4Rac28V1ht/oqhC9ssDaQ+ziqJqBqw7anFeAm8Fybkzk+8qu5NHJVIfeIF7Gghga8TAu27TVhG5SBXbcMgwV/dfOTNfylpM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786630660; c=relaxed/simple; bh=7cSh+ZOQF1ttbEyvZ7deQKVt8lNMVdXBvyaQ+X2LFb8=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=ep72P06B12rKcBX15Hjk4OGMF9i4Qa2CoHezyD9cgvKgFwr7iIl1EjswtY1s2Cw8w//nP4ps7AGVFwo9lcVMjBxZetNFS0CDTUu5a52jaCZk1AO9J5IaVnEIjPjhYqnc4znebY6o/bcCK/KIwQyiub4gVbkUDjOsbfRBdhIQ1J0= 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=209.85.161.71 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-oo1-f71.google.com with SMTP id 006d021491bc7-6ae46631c42so558247eaf.2 for ; Thu, 13 Aug 2026 07:17:38 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1786630658; x=1787235458; h=content-type:to:from:subject:message-id:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=k7683axQu9MaY5QNr0NUtJI9WWdu74T+AfXLHQ04040=; b=nU+Fi52kOmdXP49R8V5lXUSj27/GJLlVY5ftMmyRR60jS4+Foq5PxYbug5DNOELOcb 4EEPBBGEilaRIrgZMNpd+Yo76Zp4+HEuNsW+l9IQ9p4tR6dFCE7RBLA/x282wIzEM1FV 39KoUGQ9XCO8kBpCHb1gKTgKbadH9DpyOBJ4upt/wDikSon+lYCb2Gr6337T7pRnSC3Q XLe9lZ26nhkxKqbzIRTyZ/76Y368/kWGB/l+h31VHf9y4Y42YMo4H75tU9R/YE+mfq6Q 2GVQetsAChKVVEVGPZDyHaSig6H/QAyphuMH4rQgGF/myAXrTFD81dnguiNyFHnJTcNq xZwA== X-Gm-Message-State: AOJu0Yy5P6et60LZH0PQWQhR2GC+B81FTk6wNNsIP4Ph6KAYUdq3IFdm wfZZ6SCuej0GT5QTa0db9G3V3p8yZQX52p8Hi3hDrq041ElZwQ5skVR3js3nxe/6lAW+X0UWKc3 ZOyzbNT53IUej3Brgc43kF88QAcBJsseT9c54F6XzcsV/1e5FxoXKt2WfrVM= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:16a4:b0:6ae:90c3:32b6 with SMTP id 006d021491bc7-6b0c41afa19mr4804450eaf.1.1786630657713; Thu, 13 Aug 2026 07:17:37 -0700 (PDT) Date: Thu, 13 Aug 2026 07:17:37 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a7dd201.f70deec7.2acc03.0008.GAE@google.com> Subject: [syzbot] [netfs?] general protection fault in netfs_prepare_write From: syzbot To: linux-kernel@vger.kernel.org, netfs@lists.linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 3d6d817622b0 Merge tag 'scsi-fixes' of git://git.kernel.or.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14832c79580000 kernel config: https://syzkaller.appspot.com/x/.config?x=c44651ea7dd2f307 dashboard link: https://syzkaller.appspot.com/bug?extid=6a13fc77eb6f0802be2d compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12832c79580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+6a13fc77eb6f0802be2d@syzkaller.appspotmail.com RBP: 0000000000000006 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2bf1f9f288 R13: 0000000000000005 R14: 0000000000000000 R15: 00007f2bf1fa3252 Oops: general protection fault, probably for non-canonical address 0xdffffc0000000015: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x00000000000000a8-0x00000000000000af] CPU: 3 UID: 0 PID: 6023 Comm: syz-executor218 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:netfs_prepare_write+0xbc/0x7b0 fs/netfs/write_issue.c:173 Code: e1 07 38 ca 7f 08 84 d2 0f 85 04 06 00 00 48 8d bb ad 00 00 00 0f b6 45 52 48 ba 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 <0f> b6 14 11 48 89 f9 83 e1 07 38 ca 7f 08 84 d2 0f 85 c1 05 00 00 RSP: 0018:ffffc90003ea7b40 EFLAGS: 00010203 RAX: 0000000000000005 RBX: 0000000000000000 RCX: 0000000000000015 RDX: dffffc0000000000 RSI: ffffffff82cb9219 RDI: 00000000000000ad RBP: ffff8880383da660 R08: 00000000ffffffff R09: fffffbfff1dbdcfe R10: ffffffff8edee7f3 R11: 0000000000000000 R12: ffff8880383da580 R13: ffff8880383da738 R14: 000000000000001c R15: ffff8880383da6b2 FS: 000055558535c400(0000) GS:ffff8880d60ec000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000557b8da30300 CR3: 0000000028cd1000 CR4: 0000000000352ef0 Call Trace: netfs_unbuffered_write+0x75c/0x2020 fs/netfs/direct_write.c:111 netfs_unbuffered_write_iter_locked+0x7d6/0xa80 fs/netfs/direct_write.c:290 netfs_unbuffered_write_iter+0x442/0x720 fs/netfs/direct_write.c:382 v9fs_file_write_iter+0xbf/0x100 fs/9p/vfs_file.c:409 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x6ac/0x1050 fs/read_write.c:687 ksys_write+0x12a/0x250 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f2bf1f5355e Code: 08 0f 85 f5 e2 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 90 41 57 41 56 4d 89 c6 41 55 4d 89 cd 41 54 55 53 48 83 ec 08 RSP: 002b:00007fffd127ea28 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000055558535c400 RCX: 00007f2bf1f5355e RDX: 0000000000000004 RSI: 00007f2bf1fa31f6 RDI: 0000000000000005 RBP: 0000000000000006 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2bf1f9f288 R13: 0000000000000005 R14: 0000000000000000 R15: 00007f2bf1fa3252 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:netfs_prepare_write+0xbc/0x7b0 fs/netfs/write_issue.c:173 Code: e1 07 38 ca 7f 08 84 d2 0f 85 04 06 00 00 48 8d bb ad 00 00 00 0f b6 45 52 48 ba 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 <0f> b6 14 11 48 89 f9 83 e1 07 38 ca 7f 08 84 d2 0f 85 c1 05 00 00 RSP: 0018:ffffc90003ea7b40 EFLAGS: 00010203 RAX: 0000000000000005 RBX: 0000000000000000 RCX: 0000000000000015 RDX: dffffc0000000000 RSI: ffffffff82cb9219 RDI: 00000000000000ad RBP: ffff8880383da660 R08: 00000000ffffffff R09: fffffbfff1dbdcfe R10: ffffffff8edee7f3 R11: 0000000000000000 R12: ffff8880383da580 R13: ffff8880383da738 R14: 000000000000001c R15: ffff8880383da6b2 FS: 000055558535c400(0000) GS:ffff8880d60ec000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000557b8da30300 CR3: 0000000028cd1000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess): 0: e1 07 loope 0x9 2: 38 ca cmp %cl,%dl 4: 7f 08 jg 0xe 6: 84 d2 test %dl,%dl 8: 0f 85 04 06 00 00 jne 0x612 e: 48 8d bb ad 00 00 00 lea 0xad(%rbx),%rdi 15: 0f b6 45 52 movzbl 0x52(%rbp),%eax 19: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx 20: fc ff df 23: 48 89 f9 mov %rdi,%rcx 26: 48 c1 e9 03 shr $0x3,%rcx * 2a: 0f b6 14 11 movzbl (%rcx,%rdx,1),%edx <-- trapping instruction 2e: 48 89 f9 mov %rdi,%rcx 31: 83 e1 07 and $0x7,%ecx 34: 38 ca cmp %cl,%dl 36: 7f 08 jg 0x40 38: 84 d2 test %dl,%dl 3a: 0f 85 c1 05 00 00 jne 0x601 --- 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