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Sun, 29 Sep 2024 23:51:03 -0700 (PDT) Date: Sun, 29 Sep 2024 23:51:03 -0700 In-Reply-To: <66f7b3a0.050a0220.46d20.0038.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <66fa4a57.050a0220.aab67.0027.GAE@google.com> Subject: Re: [syzbot] [mm?] possible deadlock in shmem_file_write_iter From: syzbot To: akpm@linux-foundation.org, ebpqwerty472123@gmail.com, hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, paul@paul-moore.com, stephen.smalley.work@gmail.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" X-Stat-Signature: bjqno3x9qx36c5gkd3an9ncuiskdhb5d X-Rspamd-Queue-Id: 0702C180008 X-Rspam-User: X-Rspamd-Server: rspam10 X-HE-Tag: 1727679064-582248 X-HE-Meta: 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 K1ThQ3OZ 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 wxP3EiLZ TGKgC0yuxy9cYPU+xM2vg97Lp38045AM0ydQC11lWTCoyQmGxH+DYQBxp3dJn1ZXFjSNLzZL3klP7iMoQ/6/fdEo17g6yl+b6sZnNhInFU8YuFZSwTq/3nK6TKjnCz50Iegmr2QIbXPaPtbk8zD7sFI3ssuT3+Yaq8nYAl+TsOTdwI77DdXU1MGHh7bh4WuxJRXdRPvVuk++1jn0o3XaMn6ghBfuGg//p22S4a9UGec= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: syzbot has bisected this issue to: commit ea7e2d5e49c05e5db1922387b09ca74aa40f46e2 Author: Shu Han Date: Tue Sep 17 09:41:04 2024 +0000 mm: call the security_mmap_file() LSM hook in remap_file_pages() bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=110d4ea9980000 start commit: 3efc57369a0c Merge tag 'for-linus' of git://git.kernel.org.. git tree: upstream final oops: https://syzkaller.appspot.com/x/report.txt?x=130d4ea9980000 console output: https://syzkaller.appspot.com/x/log.txt?x=150d4ea9980000 kernel config: https://syzkaller.appspot.com/x/.config?x=a4fcb065287cdb84 dashboard link: https://syzkaller.appspot.com/bug?extid=288aa6838b3263f52e7e syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17af2980580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11607d9f980000 Reported-by: syzbot+288aa6838b3263f52e7e@syzkaller.appspotmail.com Fixes: ea7e2d5e49c0 ("mm: call the security_mmap_file() LSM hook in remap_file_pages()") For information about bisection process see: https://goo.gl/tpsmEJ#bisection