From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f69.google.com (mail-oo1-f69.google.com [209.85.161.69]) (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 BEEFC313550 for ; Wed, 11 Feb 2026 11:30:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.69 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770809435; cv=none; b=OCiot2MbkTKl6yAGoG8aEPQl6Dl+Jab/bdP6ziyuW/cTPXoMZctCy9jMdQfyLyXKSMwkYGsWVCJ8hhIz5PSnY6P04X97QNiubezZXx/Nmr/eLJqqEuHHkZ6qP3e1XUFjjM96OaxBnFY5RzW6SD5U6URdE1F80bS/T48t4I7+sMk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770809435; c=relaxed/simple; bh=u0xoDv2+kAoobBzt/NaBQMbvEqM4hanp7cc1KRUS8Gw=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=aSsy03QTADAfYYh9KZ5tGZwMZni33oFrMq1ne5z67CZ16uRgJnVJ0Eczk6Kns339hzf5ScVnKCWejRDW5dxV2JD9PlbQPB3wLpnM9WkgKMFZS9Dryijkx1kA9APBMu0bcOmWbAwtR4LGlw0q5Dp1THrRgUo6ZyfvF86xRU78+Pg= 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=209.85.161.69 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-oo1-f69.google.com with SMTP id 006d021491bc7-66ad005c9dfso11312304eaf.1 for ; Wed, 11 Feb 2026 03:30:33 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1770809432; x=1771414232; h=to:from:subject:message-id:in-reply-to:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=5mD4ROzvxWtQWHYsL49AuxnlWS8DSC7+nMe1S5XrkHE=; b=b4sg3zVnZ/ea7M0gVZBnKc+of6dp/wz0R/iC6Sgk+Iz7R+1lThlNOxnUOG3kQ8mJaV tbwUjFovR4Py+N2tr4qqneD6apBm/oVmYRdv0UV6ORvF64mR3BPbZODEJK501HftSplx QblUjixa26+I3UFO5mSnxiki0RWUOxADD2a2mmmCvQPJoSR04cKWholKC+OJfPLlXZsR UP4gj6e3pkrpxR6aJyCJUuq1UkOpnPTbzyhIK0la0ycOdWoUvLajQCvzyPi60myOK6qQ /YusEK6ONOku3/GatQnm/ToVWQyRK7JLwcRxXTDRGMRmaV6M9EcqyIhfxKXC/40Kv+CZ UI6w== X-Forwarded-Encrypted: i=1; AJvYcCXp9SM8hkKyCJypkbv3jyqI6I/kmParCObIGs6uhS20Nnk45c6jPkANS+/ekdqOPKogiqkHggAqeBec@vger.kernel.org X-Gm-Message-State: AOJu0YwT4RQP69Rrhjh99O/EvuyENUZrw9InXc7WD400icRrDKjGROz8 7TXsezcy2CQQqpeIzfG+yyTYJzB8xhsG5kmrZ+EYV6ONJFoNnw0gn3O1tnPENlqQco+9frh/NuA HSfMOrSiMRj40mBX1y5ZGQEXNoYnz5s2RrcWoL9SWT0NOrXpjq71O2tHMxs0= Precedence: bulk X-Mailing-List: linux-ext4@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:220b:b0:663:89a:8125 with SMTP id 006d021491bc7-66d0bcb984amr9877411eaf.51.1770809432682; Wed, 11 Feb 2026 03:30:32 -0800 (PST) Date: Wed, 11 Feb 2026 03:30:32 -0800 In-Reply-To: <6980e9ff.050a0220.16b13.00a9.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <698c6858.050a0220.340abe.000e.GAE@google.com> Subject: Re: [syzbot] [ext4?] kernel BUG in ext4_write_inline_data (4) From: syzbot To: adilger.kernel@dilger.ca, kartikey406@gmail.com, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, tytso@mit.edu Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: dc855b77719f Merge tag 'irq-drivers-2026-02-09' of git://g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=179e0b3a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=c48edf5effbe2b83 dashboard link: https://syzkaller.appspot.com/bug?extid=7de5fe447862fc37576f compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=137b6ae6580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=109fb402580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/d7c9816606c2/disk-dc855b77.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/cb6f0c59d3d1/vmlinux-dc855b77.xz kernel image: https://storage.googleapis.com/syzbot-assets/7abf33193f14/bzImage-dc855b77.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/cc23e4e0f61c/mount_0.gz fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=11aaccaa580000) IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+7de5fe447862fc37576f@syzkaller.appspotmail.com ------------[ cut here ]------------ kernel BUG at fs/ext4/inline.c:240! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 6183 Comm: syz.1.27 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 RIP: 0010:ext4_write_inline_data+0x43c/0x440 fs/ext4/inline.c:240 Code: c1 38 c1 0f 8c 19 ff ff ff 48 89 df 49 89 d7 e8 3a 5d ac ff 4c 89 fa e9 06 ff ff ff e8 7d 31 43 ff 90 0f 0b e8 75 31 43 ff 90 <0f> 0b 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f RSP: 0018:ffffc900041bf3a8 EFLAGS: 00010293 RAX: ffffffff8281434b RBX: 0000000000003000 RCX: ffff88802ab8dac0 RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000003000 RBP: ffff888072ee11a2 R08: ffff88805b996387 R09: 1ffff1100b732c70 R10: dffffc0000000000 R11: ffffed100b732c71 R12: 000000000000003c R13: ffffc900041bf460 R14: 0000000000002000 R15: ffff888072ee0c38 FS: 00007f67e2ffe6c0(0000) GS:ffff8881256ca000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555753c59e8 CR3: 0000000079001000 CR4: 0000000000350ef0 Call Trace: ext4_write_inline_data_end+0x34d/0xad0 fs/ext4/inline.c:817 generic_perform_write+0x620/0x8f0 mm/filemap.c:4335 ext4_buffered_write_iter+0xce/0x3a0 fs/ext4/file.c:300 ext4_file_write_iter+0x298/0x1c10 fs/ext4/file.c:-1 iter_file_splice_write+0x99b/0x1100 fs/splice.c:738 do_splice_from fs/splice.c:938 [inline] direct_splice_actor+0x101/0x160 fs/splice.c:1161 splice_direct_to_actor+0x53a/0xc70 fs/splice.c:1105 do_splice_direct_actor fs/splice.c:1204 [inline] do_splice_direct+0x195/0x290 fs/splice.c:1230 do_sendfile+0x535/0x7d0 fs/read_write.c:1372 __do_sys_sendfile64 fs/read_write.c:1433 [inline] __se_sys_sendfile64+0x144/0x1a0 fs/read_write.c:1419 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f67e399bf79 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f67e2ffe028 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f67e3c15fa0 RCX: 00007f67e399bf79 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000004 RBP: 00007f67e3a327e0 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000e3aa6ea R11: 0000000000000246 R12: 0000000000000000 R13: 00007f67e3c16038 R14: 00007f67e3c15fa0 R15: 00007fff789394f8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ext4_write_inline_data+0x43c/0x440 fs/ext4/inline.c:240 Code: c1 38 c1 0f 8c 19 ff ff ff 48 89 df 49 89 d7 e8 3a 5d ac ff 4c 89 fa e9 06 ff ff ff e8 7d 31 43 ff 90 0f 0b e8 75 31 43 ff 90 <0f> 0b 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f RSP: 0018:ffffc900041bf3a8 EFLAGS: 00010293 RAX: ffffffff8281434b RBX: 0000000000003000 RCX: ffff88802ab8dac0 RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000003000 RBP: ffff888072ee11a2 R08: ffff88805b996387 R09: 1ffff1100b732c70 R10: dffffc0000000000 R11: ffffed100b732c71 R12: 000000000000003c R13: ffffc900041bf460 R14: 0000000000002000 R15: ffff888072ee0c38 FS: 00007f67e2ffe6c0(0000) GS:ffff8881256ca000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa159255000 CR3: 0000000079001000 CR4: 0000000000350ef0 --- 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.