From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-io1-f70.google.com (mail-io1-f70.google.com [209.85.166.70]) (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 83B2321B91D for ; Sat, 22 Nov 2025 08:15:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.70 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763799342; cv=none; b=Wg0mV+MCKn86MIKr2W38NKtDcSlr/Hb+M/W4SNHc71gX4bNy/gV2e616Ft+qmfEfiN9/IOuqzhw6ejynLz50szDC5nkZ8Kp96BnFLkshBXVtP9UR4COOBiNjxhBJizcfcaqJEtkL1i6yBoLKnoxVa/7jm8yIPxHxR3wIHPooAuE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763799342; c=relaxed/simple; bh=9Wqp3p6MoaW+UfgHeVjnNhuV64sWBPB+q4zMgtHC55o=; h=MIME-Version:Date:Message-ID:Subject:From:To:Cc:Content-Type; b=V8LRTWI5sJkQa6GY5QJ2gF0rYR36P1E3Dp3lgOVbARc6/C5/qzfJAGLvpxcUZR2oEK26eZTyzNplJEcl8MS45Cgaaa2TnATZFOjs1vEe6i6sZZyAeqXJCIqA7qweUTnUPjlMatgknhM8vSllfV+jH2mz2E2YHr/p4Yx/8xXUOTI= 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=209.85.166.70 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-f70.google.com with SMTP id ca18e2360f4ac-949356ff502so224263839f.0 for ; Sat, 22 Nov 2025 00:15:30 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1763799329; x=1764404129; h=cc:to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=1WQccvNvmfsaIritq+ZZb+GplJoU63FdL9J5fDkXJd8=; b=ma6o8xc4OJn3807rKy/MZRHLBwdR70gkf4U4nNWbwu+B8h4Kx5gsq5aqLszvjGrQbk 3BotNB7a6rotNtmd0mjYQrOnP2TeSxMuaW38ex2SGuskIX3IjvhUKrLzQvMrKbEb11kh YDPmI8jBzNubTJg9HU8V/ttp5PFHoD9R84U+avN3xVZ1wK8i2AyCEffQOSEx83/c9gFs F6hEydaLqn8UfgKoVnOl2g7da/Q1b6fm2ichwf7KyHHzKxL8VFXq+Qlqo5T457UOPQs+ 6JEwv+yQRs31HTT8C5BIEh0gNZqMiBThT7F4WcnILpJ8y5dPeOBl2Mb2CaeabLjs0gmz 8GJA== X-Gm-Message-State: AOJu0YxoRHd9Bro8uipZ5u1nwJGyBXxvQzQ44lu47SjcIhdzoSmoPDB3 NuAsZ4Wgd4Cw5H7hrx3gkCJ34nK1lzoYX9fWYrKZHz0p1HjzsQTLNViCibzyjbjKYpr4IB7TkGP lhehRawvzc7KM2qpRvVP004v9XASIlHoEV+E+n+8bwJ3qgRCGrBTT5deGfrw= X-Google-Smtp-Source: AGHT+IFLW/B3xU7FR48VESOHb7MvLS+Pp3fYHK785h0glUstvF6BUTjkzm5j4Kjd63MmrWaC9ov644KRcqInTKcyfXvsjLJ/JKtL Precedence: bulk X-Mailing-List: syzbot@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a92:c248:0:b0:434:96ea:ff55 with SMTP id e9e14a558f8ab-435b98ee9d9mr42281445ab.38.1763799329671; Sat, 22 Nov 2025 00:15:29 -0800 (PST) Date: Sat, 22 Nov 2025 00:15:29 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69217121.a70a0220.2ea503.0066.GAE@google.com> Subject: [moderation/CI] Re: ext4: fix unaligned preallocation with bigalloc From: syzbot ci To: syzkaller-upstream-moderation@googlegroups.com Cc: syzbot@lists.linux.dev Content-Type: text/plain; charset="UTF-8" syzbot ci has tested the following series [v2] ext4: fix unaligned preallocation with bigalloc https://lore.kernel.org/all/20251122024555.140798-2-eraykrdg1@gmail.com * [PATCH v2] ext4: fix unaligned preallocation with bigalloc and found the following issues: * WARNING in ext4_mb_complex_scan_group * WARNING in mb_update_avg_fragment_size Full report is available here: https://ci.syzbot.org/series/ba644d0c-b0cd-47e5-aac4-5bc33f8d2823 *** WARNING in ext4_mb_complex_scan_group tree: torvalds URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux base: 23cb64fb76257309e396ea4cec8396d4a1dbae68 arch: amd64 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 config: https://ci.syzbot.org/builds/3d0f1523-91b4-4aa0-b4ec-0f13803a4e4e/config C repro: https://ci.syzbot.org/findings/d24ca945-6ee1-4b64-827e-93a61ab96735/c_repro syz repro: https://ci.syzbot.org/findings/d24ca945-6ee1-4b64-827e-93a61ab96735/syz_repro EXT4-fs: Ignoring removed bh option EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback. ------------[ cut here ]------------ WARNING: CPU: 1 PID: 5962 at fs/ext4/mballoc.c:2531 ext4_mb_complex_scan_group+0xd64/0xf30 fs/ext4/mballoc.c:2531 Modules linked in: CPU: 1 UID: 0 PID: 5962 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:ext4_mb_complex_scan_group+0xd64/0xf30 fs/ext4/mballoc.c:2531 Code: 81 c4 c8 00 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d e9 01 f8 cc 08 cc e8 1b 97 43 ff 90 0f 0b 90 e9 3d fe ff ff e8 0d 97 43 ff 90 <0f> 0b 65 48 8b 05 62 e3 f1 0f 48 3b 84 24 c0 00 00 00 75 20 90 eb RSP: 0018:ffffc90003c069c8 EFLAGS: 00010293 RAX: ffffffff827c6cb3 RBX: 00000000fffffff8 RCX: ffff888114d61d00 RDX: 0000000000000000 RSI: 00000000fffffff8 RDI: 0000000000000001 RBP: ffff88816ef5b000 R08: ffff888114d61d00 R09: 0000000000000005 R10: 0000000000000004 R11: 0000000000000000 R12: ffff888166fec000 R13: ffff888166fec638 R14: ffff8881b7ac0000 R15: dffffc0000000000 FS: 0000555585e78500(0000) GS:ffff8882a9f3b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2ec63fff CR3: 000000011407a000 CR4: 00000000000006f0 Call Trace: __ext4_mb_scan_group fs/ext4/mballoc.c:2664 [inline] ext4_mb_scan_group+0x116e/0x18e0 fs/ext4/mballoc.c:2955 ext4_mb_scan_groups_linear+0xe8/0x360 fs/ext4/mballoc.c:1146 ext4_mb_scan_groups fs/ext4/mballoc.c:1180 [inline] ext4_mb_regular_allocator+0x90e/0x2970 fs/ext4/mballoc.c:3026 ext4_mb_new_blocks+0xd11/0x4720 fs/ext4/mballoc.c:6320 ext4_ext_map_blocks+0x161a/0x6ac0 fs/ext4/extents.c:4383 ext4_map_create_blocks fs/ext4/inode.c:609 [inline] ext4_map_blocks+0x860/0x1740 fs/ext4/inode.c:811 _ext4_get_block+0x200/0x4c0 fs/ext4/inode.c:910 ext4_get_block_unwritten+0x2e/0x100 fs/ext4/inode.c:943 ext4_block_write_begin+0x993/0x1710 fs/ext4/inode.c:1198 ext4_write_begin+0xc04/0x19a0 fs/ext4/ext4_jbd2.h:-1 ext4_da_write_begin+0x445/0xda0 fs/ext4/inode.c:3129 generic_perform_write+0x2c5/0x900 mm/filemap.c:4254 ext4_buffered_write_iter+0xce/0x3a0 fs/ext4/file.c:299 ext4_file_write_iter+0x298/0x1bc0 fs/ext4/file.c:-1 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x5c9/0xb30 fs/read_write.c:686 ksys_write+0x145/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f3f93f8f749 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff83277a88 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f3f941e5fa0 RCX: 00007f3f93f8f749 RDX: 0000000000001006 RSI: 0000200000000940 RDI: 0000000000000005 RBP: 00007f3f94013f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f3f941e5fa0 R14: 00007f3f941e5fa0 R15: 0000000000000003 *** WARNING in mb_update_avg_fragment_size tree: torvalds URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux base: 23cb64fb76257309e396ea4cec8396d4a1dbae68 arch: amd64 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 config: https://ci.syzbot.org/builds/3d0f1523-91b4-4aa0-b4ec-0f13803a4e4e/config C repro: https://ci.syzbot.org/findings/4f77b4c9-f795-4c41-ad77-5c5a174be3a1/c_repro syz repro: https://ci.syzbot.org/findings/4f77b4c9-f795-4c41-ad77-5c5a174be3a1/syz_repro EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback. EXT4-fs: Ignoring removed orlov option EXT4-fs (loop0): can't enable nombcache during remount ------------[ cut here ]------------ WARNING: CPU: 1 PID: 5969 at fs/ext4/mballoc.c:839 mb_avg_fragment_size_order fs/ext4/mballoc.c:839 [inline] WARNING: CPU: 1 PID: 5969 at fs/ext4/mballoc.c:839 mb_update_avg_fragment_size+0x304/0x450 fs/ext4/mballoc.c:856 Modules linked in: CPU: 1 UID: 0 PID: 5969 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:mb_avg_fragment_size_order fs/ext4/mballoc.c:839 [inline] RIP: 0010:mb_update_avg_fragment_size+0x304/0x450 fs/ext4/mballoc.c:856 Code: 5d 41 5e 41 5f 5d e9 1b 6a cd 08 e8 96 57 44 ff 48 83 c4 28 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc e8 7d 57 44 ff 90 <0f> 0b 90 48 bb 00 00 00 00 00 fc ff df 41 0f b6 44 1d 00 84 c0 0f RSP: 0018:ffffc90003a56f48 EFLAGS: 00010293 RAX: ffffffff827bac43 RBX: 000000000000000d RCX: ffff8881037ad700 RDX: 0000000000000000 RSI: 000000000000000c RDI: 000000000000001e RBP: 000000000000001e R08: ffff8881a9014007 R09: 1ffff11035202800 R10: dffffc0000000000 R11: ffffed1035202801 R12: ffff88810b77e014 R13: 1ffff110216efc02 R14: 000000000000001f R15: 000000000000000c FS: 000055557ed08500(0000) GS:ffff8882a9f3b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9c75c3f000 CR3: 0000000112a5a000 CR4: 00000000000006f0 Call Trace: mb_mark_used+0xfd8/0x12f0 fs/ext4/mballoc.c:2195 ext4_mb_use_best_found+0x192/0x7e0 fs/ext4/mballoc.c:2216 ext4_mb_check_limits fs/ext4/mballoc.c:2280 [inline] ext4_mb_complex_scan_group+0xd27/0xf30 fs/ext4/mballoc.c:2596 __ext4_mb_scan_group fs/ext4/mballoc.c:2664 [inline] ext4_mb_scan_group+0x116e/0x18e0 fs/ext4/mballoc.c:2955 ext4_mb_scan_groups_linear+0xe8/0x360 fs/ext4/mballoc.c:1146 ext4_mb_scan_groups fs/ext4/mballoc.c:1180 [inline] ext4_mb_regular_allocator+0x90e/0x2970 fs/ext4/mballoc.c:3026 ext4_mb_new_blocks+0xd11/0x4720 fs/ext4/mballoc.c:6320 ext4_ext_map_blocks+0x161a/0x6ac0 fs/ext4/extents.c:4383 ext4_map_create_blocks fs/ext4/inode.c:609 [inline] ext4_map_blocks+0x860/0x1740 fs/ext4/inode.c:811 ext4_convert_inline_data_nolock+0x249/0x970 fs/ext4/inline.c:1112 ext4_convert_inline_data+0x4b3/0x5e0 fs/ext4/inline.c:1976 ext4_fallocate+0x1e2/0x3d0 fs/ext4/extents.c:4793 vfs_fallocate+0x669/0x7e0 fs/open.c:342 ksys_fallocate fs/open.c:366 [inline] __do_sys_fallocate fs/open.c:371 [inline] __se_sys_fallocate fs/open.c:369 [inline] __x64_sys_fallocate+0xc0/0x110 fs/open.c:369 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9c7eb8f749 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd1029f7c8 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007f9c7ede5fa0 RCX: 00007f9c7eb8f749 RDX: 0000000000004003 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00007f9c7ec13f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000010000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f9c7ede5fa0 R14: 00007f9c7ede5fa0 R15: 0000000000000004 *** If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: syzbot@syzkaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@googlegroups.com. The email will later be sent to: [adilger.kernel@dilger.ca albinbabuvarghese20@gmail.com david.hunter.linux@gmail.com eraykrdg1@gmail.com linux-ext4@vger.kernel.org linux-kernel@vger.kernel.org skhan@linuxfoundation.org syzbot@syzkaller.appspotmail.com tytso@mit.edu] If the report looks fine to you, reply with: #syz upstream