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AKwUvBws+Jmo3uPLs/LsZQNosbHwfO7zXAi0/3qQA8RMP2iO2tzeKvDuO5/f0a1tfPWQoEqXusAkKN1GewAeC3g=@vger.kernel.org X-Gm-Message-State: AFuF++mKcgPEI/6WemHrjYuTZfmkokSyR+YDm8jqQ51Oi/hJchS0PU34 KXFsQHjr0zvHRQj/G7ahV/Zvcz09Yq6SYl74wYo+S0EFVE4nJ7zcpjc+Bt25QCWlmrxSHFdaDFn ZhgjeQp7mcH8bL7XfMVmsbSTExZF8GqrbmN3o9FhYeH1SkeKPOfyxB3rjmks= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:10cd:b0:4ea:b118:c436 with SMTP id 5614622812f47-4faab5946ecmr565375b6e.5.1791229897379; Mon, 05 Oct 2026 12:51:37 -0700 (PDT) Date: Mon, 05 Oct 2026 12:51:37 -0700 In-Reply-To: <6abadfc1.69bd487b.a6f8c.0008.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6ac3ffc9.34119e79.2f92f3.0037.GAE@google.com> Subject: Re: [syzbot] [nilfs?] WARNING in nilfs_rmdir (3) From: syzbot To: konishi.ryusuke@gmail.com, linux-kernel@vger.kernel.org, linux-nilfs@vger.kernel.org, slava@dubeyko.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: 67f0943b394d Merge tag 'selinux-pr-20261005' of git://git... git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git console output: https://syzkaller.appspot.com/x/log.txt?x=11cb9835580000 kernel config: https://syzkaller.appspot.com/x/.config?x=341a98f91c13ec9 dashboard link: https://syzkaller.appspot.com/bug?extid=c388db0347b7fc88fa7a compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11d47ec9580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c388db0347b7fc88fa7a@syzkaller.appspotmail.com NILFS (loop0): broken superblock, retrying with spare superblock (blocksize = 1024) NILFS (loop0): broken superblock, retrying with spare superblock (blocksize = 4096) ------------[ cut here ]------------ inode->i_nlink == 0 WARNING: fs/inode.c:408 at drop_nlink+0xc5/0x110 fs/inode.c:408, CPU#1: syz-executor166/5936 Modules linked in: CPU: 1 UID: 0 PID: 5936 Comm: syz-executor166 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 RIP: 0010:drop_nlink+0xc5/0x110 fs/inode.c:408 Code: 50 09 00 00 be 08 00 00 00 e8 e7 45 e9 ff f0 48 ff 83 50 09 00 00 5b 41 5c 41 5e 41 5f 5d c3 cc cc cc cc cc e8 bc 47 7d ff 90 <0f> 0b 90 eb 81 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 5b ff ff ff RSP: 0018:ffffc9000392fc70 EFLAGS: 00010293 RAX: ffffffff82498df4 RBX: ffff88805e9c9558 RCX: ffff888032d7ddc0 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: ffffed100535792b R12: 1ffff1100bd392b4 R13: ffff88805e9c9558 R14: ffff88805e9c95a0 R15: dffffc0000000000 FS: 000055555fff0400(0000) GS:ffff888125cc2000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb871d39286 CR3: 00000000361f2000 CR4: 00000000003526f0 Call Trace: nilfs_rmdir+0x1b4/0x250 fs/nilfs2/namei.c:347 vfs_rmdir+0x3e9/0x6b0 fs/namei.c:5515 filename_rmdir+0x292/0x520 fs/namei.c:5572 __do_sys_rmdir fs/namei.c:5595 [inline] __se_sys_rmdir+0x2e/0x140 fs/namei.c:5592 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8f87bafa97 Code: 00 00 90 48 83 ec 10 48 63 ff 45 31 c9 45 31 c0 6a 00 31 c9 e8 4a 07 02 00 48 83 c4 18 c3 0f 1f 44 00 00 b8 54 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 d8 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007ffd6579c7f8 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f8f87bafa97 RDX: 0000000000000000 RSI: 00007f8f87c393a3 RDI: 00007f8f87c0cc45 RBP: 00007f8f87c0cbee R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 00007ffd6579c800 R13: 0000000000000000 R14: 00007f8f87c34cc0 R15: 0000000000000002 --- 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.