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[2403:580d:fda1::299]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-29498d0acecsm74108445ad.38.2025.10.27.02.22.16 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 27 Oct 2025 02:22:19 -0700 (PDT) Message-ID: Date: Mon, 27 Oct 2025 19:52:14 +1030 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [syzbot] [btrfs?] WARNING in lookup_inline_extent_backref (2) To: syzbot , clm@fb.com, dsterba@suse.com, josef@toxicpanda.com, linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com References: <68ff35d4.050a0220.32483.0015.GAE@google.com> Content-Language: en-US From: Qu Wenruo Autocrypt: addr=wqu@suse.com; keydata= xsBNBFnVga8BCACyhFP3ExcTIuB73jDIBA/vSoYcTyysFQzPvez64TUSCv1SgXEByR7fju3o 8RfaWuHCnkkea5luuTZMqfgTXrun2dqNVYDNOV6RIVrc4YuG20yhC1epnV55fJCThqij0MRL 1NxPKXIlEdHvN0Kov3CtWA+R1iNN0RCeVun7rmOrrjBK573aWC5sgP7YsBOLK79H3tmUtz6b 9Imuj0ZyEsa76Xg9PX9Hn2myKj1hfWGS+5og9Va4hrwQC8ipjXik6NKR5GDV+hOZkktU81G5 gkQtGB9jOAYRs86QG/b7PtIlbd3+pppT0gaS+wvwMs8cuNG+Pu6KO1oC4jgdseFLu7NpABEB AAHNGFF1IFdlbnJ1byA8d3F1QHN1c2UuY29tPsLAlAQTAQgAPgIbAwULCQgHAgYVCAkKCwIE FgIDAQIeAQIXgBYhBC3fcuWlpVuonapC4cI9kfOhJf6oBQJnEXVgBQkQ/lqxAAoJEMI9kfOh Jf6o+jIH/2KhFmyOw4XWAYbnnijuYqb/obGae8HhcJO2KIGcxbsinK+KQFTSZnkFxnbsQ+VY fvtWBHGt8WfHcNmfjdejmy9si2jyy8smQV2jiB60a8iqQXGmsrkuR+AM2V360oEbMF3gVvim 2VSX2IiW9KERuhifjseNV1HLk0SHw5NnXiWh1THTqtvFFY+CwnLN2GqiMaSLF6gATW05/sEd V17MdI1z4+WSk7D57FlLjp50F3ow2WJtXwG8yG8d6S40dytZpH9iFuk12Sbg7lrtQxPPOIEU rpmZLfCNJJoZj603613w/M8EiZw6MohzikTWcFc55RLYJPBWQ+9puZtx1DopW2jOwE0EWdWB rwEIAKpT62HgSzL9zwGe+WIUCMB+nOEjXAfvoUPUwk+YCEDcOdfkkM5FyBoJs8TCEuPXGXBO Cl5P5B8OYYnkHkGWutAVlUTV8KESOIm/KJIA7jJA+Ss9VhMjtePfgWexw+P8itFRSRrrwyUf E+0WcAevblUi45LjWWZgpg3A80tHP0iToOZ5MbdYk7YFBE29cDSleskfV80ZKxFv6koQocq0 vXzTfHvXNDELAuH7Ms/WJcdUzmPyBf3Oq6mKBBH8J6XZc9LjjNZwNbyvsHSrV5bgmu/THX2n g/3be+iqf6OggCiy3I1NSMJ5KtR0q2H2Nx2Vqb1fYPOID8McMV9Ll6rh8S8AEQEAAcLAfAQY AQgAJgIbDBYhBC3fcuWlpVuonapC4cI9kfOhJf6oBQJnEXWBBQkQ/lrSAAoJEMI9kfOhJf6o cakH+QHwDszsoYvmrNq36MFGgvAHRjdlrHRBa4A1V1kzd4kOUokongcrOOgHY9yfglcvZqlJ qfa4l+1oxs1BvCi29psteQTtw+memmcGruKi+YHD7793zNCMtAtYidDmQ2pWaLfqSaryjlzR /3tBWMyvIeWZKURnZbBzWRREB7iWxEbZ014B3gICqZPDRwwitHpH8Om3eZr7ygZck6bBa4MU o1XgbZcspyCGqu1xF/bMAY2iCDcq6ULKQceuKkbeQ8qxvt9hVxJC2W3lHq8dlK1pkHPDg9wO JoAXek8MF37R8gpLoGWl41FIUb3hFiu3zhDDvslYM4BmzI18QgQTQnotJH8= In-Reply-To: <68ff35d4.050a0220.32483.0015.GAE@google.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit 在 2025/10/27 19:35, syzbot 写道: > Hello, > > syzbot found the following issue on: > > HEAD commit: dbfc6422a34d Merge tag 'x86_urgent_for_v6.18_rc3' of git:/.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=11d993cd980000 > kernel config: https://syzkaller.appspot.com/x/.config?x=25811b07889c90db > dashboard link: https://syzkaller.appspot.com/bug?extid=b0e66d3779134f468156 > compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 > > Unfortunately, I don't have any reproducer for this issue yet. > > Downloadable assets: > disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-dbfc6422.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/73c799811c6a/vmlinux-dbfc6422.xz > kernel image: https://storage.googleapis.com/syzbot-assets/e1bb4619e00f/bzImage-dbfc6422.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+b0e66d3779134f468156@syzkaller.appspotmail.com This one is injecting an -ENOMEM at a critical path, which makes btrfs to abort the current transaction. To be honest, syzbot should not expect a completely quite system for such injected error. Thanks, Qu > > ------------[ cut here ]------------ > WARNING: CPU: 0 PID: 5319 at fs/btrfs/extent-tree.c:836 lookup_inline_extent_backref+0x12c7/0x17f0 fs/btrfs/extent-tree.c:836 > Modules linked in: > CPU: 0 UID: 0 PID: 5319 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) > Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 > RIP: 0010:lookup_inline_extent_backref+0x12c7/0x17f0 fs/btrfs/extent-tree.c:836 > Code: 05 fe 26 a5 0e 48 3b 84 24 e0 01 00 00 0f 85 8e 04 00 00 89 d8 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d e9 5b 4b 81 07 cc 90 <0f> 0b 90 48 8b 44 24 78 42 80 3c 30 00 74 0a 48 8b 7c 24 20 e8 90 > RSP: 0000:ffffc9000d23e820 EFLAGS: 00010202 > RAX: 0000000000000001 RBX: 0000000000000001 RCX: 0000000000000000 > RDX: ffff888000784900 RSI: 0000000000000001 RDI: 0000000000000000 > RBP: ffffc9000d23ea48 R08: 0000000000000000 R09: 1ffffd40002891c8 > R10: dffffc0000000000 R11: fffff940002891c9 R12: 1ffff1100a23a242 > R13: 00000000000000b2 R14: dffffc0000000000 R15: ffff8880110e2000 > FS: 00007f1616ed56c0(0000) GS:ffff88808d733000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f7e2ed37000 CR3: 000000003f2e0000 CR4: 0000000000352ef0 > Call Trace: > > insert_inline_extent_backref+0xa8/0x2f0 fs/btrfs/extent-tree.c:1205 > __btrfs_inc_extent_ref+0x263/0x9e0 fs/btrfs/extent-tree.c:1503 > run_one_delayed_ref fs/btrfs/extent-tree.c:-1 [inline] > btrfs_run_delayed_refs_for_head fs/btrfs/extent-tree.c:1972 [inline] > __btrfs_run_delayed_refs+0xebd/0x4130 fs/btrfs/extent-tree.c:2047 > btrfs_run_delayed_refs+0xe6/0x3b0 fs/btrfs/extent-tree.c:2159 > btrfs_start_dirty_block_groups+0xd3d/0x10a0 fs/btrfs/block-group.c:3534 > btrfs_commit_transaction+0x674/0x3950 fs/btrfs/transaction.c:2241 > btrfs_sync_file+0xd30/0x1160 fs/btrfs/file.c:1818 > generic_write_sync include/linux/fs.h:3046 [inline] > btrfs_do_write_iter+0x59a/0x710 fs/btrfs/file.c:1469 > iter_file_splice_write+0x975/0x10e0 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+0x5a8/0xcc0 fs/splice.c:1105 > do_splice_direct_actor fs/splice.c:1204 [inline] > do_splice_direct+0x181/0x270 fs/splice.c:1230 > do_sendfile+0x4da/0x7e0 fs/read_write.c:1370 > __do_sys_sendfile64 fs/read_write.c:1431 [inline] > __se_sys_sendfile64+0x13e/0x190 fs/read_write.c:1417 > 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: 0033:0x7f1615f8efc9 > 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:00007f1616ed5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 > RAX: ffffffffffffffda RBX: 00007f16161e6090 RCX: 00007f1615f8efc9 > RDX: 0000000000000000 RSI: 0000000000000007 RDI: 0000000000000008 > RBP: 00007f1616011f91 R08: 0000000000000000 R09: 0000000000000000 > R10: 000000007ffff000 R11: 0000000000000246 R12: 0000000000000000 > R13: 00007f16161e6128 R14: 00007f16161e6090 R15: 00007fff32122a28 > > > > --- > 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 >