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Mon, 28 Sep 2026 18:00:47 -0700 (PDT) Message-ID: Date: Tue, 29 Sep 2026 10:30:37 +0930 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] [ext4?] KASAN: slab-use-after-free Write in do_split To: syzbot , adilger.kernel@dilger.ca, boris@bur.io, dsterba@suse.com, dsterba@suse.cz, fdmanana@suse.com, jack@suse.cz, libaokun@linux.alibaba.com, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, ojaswin@linux.ibm.com, ritesh.list@gmail.com, syzkaller-bugs@googlegroups.com, tytso@mit.edu, yi.zhang@huawei.com References: <6abb0702.80e1c6cc.1e8e5f.0075.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 FgIDAQIeAQIXgBYhBC3fcuWlpVuonapC4cI9kfOhJf6oBQJqqw0NBQkUl/JeAAoJEMI9kfOh Jf6o/xYH/3AaWnGSq58XnY/T3/YYjr6g+TUZxa7MPyiYTELNpNlvmNlbtbAL0nW0LNvkeiqf SmYA+xkwY4RbxnZYQK0H5iv2w1eqa9qqFZb4bIBRmTapu26GEEkpad0W0ZhoSPMO8bV2Bwkf YdtPZQLaeUKvHZqNqBKnmtRLQj2Cgy3kuXX3bEGvWjzUOxPUSCj/S++JWBewMdMBPT62vZM0 3156gfn5mHA94s2p+NFJoWkERY+JPTMu9NISkpD7yuGhXN88qd/aqD0RrlhxvKsrQogdPwn9 vP18FGG3CRlHtOvOLVoY5NKSOWTDc+o+8t2XEETFTGbKYTcqeTzi4SxhvBLtTinOwE0EWdWB 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: <6abb0702.80e1c6cc.1e8e5f.0075.GAE@google.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit 在 2026/9/29 10:02, syzbot 写道: > syzbot has bisected this issue to: > > commit 3f757b56f1c4579fe32b810bce1d39f202964412 > Author: Filipe Manana > Date: Fri May 16 16:07:40 2025 +0000 > > btrfs: unfold transaction aborts at btrfs_create_new_inode() This bisection doesn't make any sense. The console output is showing ext4_add_entry()->do_split() causing the KASAN. Furthermore, there is no btrfs in the whole console output. There must be some randomness in the reproducer. > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=16bbf315580000 > start commit: 72d3fcf802c4 Linux 7.3-rc5 > git tree: upstream > final oops: https://syzkaller.appspot.com/x/report.txt?x=15bbf315580000 > console output: https://syzkaller.appspot.com/x/log.txt?x=11bbf315580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=718e346eb0b8f38 > dashboard link: https://syzkaller.appspot.com/bug?extid=09bec78ee77613a3efdd > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12379605580000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=127f6325580000 > > Reported-by: syzbot+09bec78ee77613a3efdd@syzkaller.appspotmail.com > Fixes: 3f757b56f1c4 ("btrfs: unfold transaction aborts at btrfs_create_new_inode()") > > For information about bisection process see: https://goo.gl/tpsmEJ#bisection