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AHgh+Rp9O20QDfxaUpeTxnaPUQMUrO6UIpxy8PIla1DP/ilfinQ8LIlwJpIEpChoncP1Ln2TkldZ2mkpRKX/3Dc=@vger.kernel.org X-Gm-Message-State: AOJu0YzghH6M3YbyWPn5tg6rGj8Z5sJrDkb+BhimtKNR6vdRRYUqWIOY 3bqgh+f7D3qZ61yimCmsmL46CN7pDVa1WudiBSqFp3AzcUwbojSPrB4u6gbKZnJtxtzbaWvo2GL eJqWkK3PrMyiAaH0aNN/aSyt0TKlAJctgVUjcRIES2PUl01/tBYKbLpXIpGk= 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:bcd:b0:497:8f1:df07 with SMTP id 5614622812f47-4af5e0583c4mr4388585b6e.7.1785544462058; Fri, 31 Jul 2026 17:34:22 -0700 (PDT) Date: Fri, 31 Jul 2026 17:34:22 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a6d3f0e.f794c993.27aeb.000a.GAE@google.com> Subject: [syzbot] [fs?] WARNING in configfs_symlink From: syzbot To: a.hindborg@kernel.org, leitao@debian.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 3b5f4b83c4ab Merge tag 'for-7.2-rc5-tag' of git://git.kern.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=139672a9580000 kernel config: https://syzkaller.appspot.com/x/.config?x=145fa60d73086782 dashboard link: https://syzkaller.appspot.com/bug?extid=608f7f2a86361e18ba0b compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1431c561580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=102ae401580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-3b5f4b83.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/ed6d6b480fd7/vmlinux-3b5f4b83.xz kernel image: https://storage.googleapis.com/syzbot-assets/d5a591a74024/bzImage-3b5f4b83.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+608f7f2a86361e18ba0b@syzkaller.appspotmail.com ------------[ cut here ]------------ !atomic_read(&sd->s_count) WARNING: fs/configfs/configfs_internal.h:146 at configfs_get fs/configfs/configfs_internal.h:146 [inline], CPU#0: syz.2.1991/9996 WARNING: fs/configfs/configfs_internal.h:146 at create_link fs/configfs/symlink.c:92 [inline], CPU#0: syz.2.1991/9996 WARNING: fs/configfs/configfs_internal.h:146 at configfs_symlink+0xdd4/0x11f0 fs/configfs/symlink.c:199, CPU#0: syz.2.1991/9996 Modules linked in: CPU: 0 UID: 0 PID: 9996 Comm: syz.2.1991 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:configfs_get fs/configfs/configfs_internal.h:146 [inline] RIP: 0010:create_link fs/configfs/symlink.c:92 [inline] RIP: 0010:configfs_symlink+0xdd4/0x11f0 fs/configfs/symlink.c:199 Code: 48 c1 e8 03 80 3c 10 00 0f 85 63 03 00 00 48 8b 74 24 18 48 8b 3d 8c 26 bb 18 e8 97 6e ad ff e9 4f fe ff ff e8 dd df 48 ff 90 <0f> 0b 90 e9 a6 f8 ff ff e8 cf df 48 ff 48 c7 c7 40 49 eb 8e e8 a3 RSP: 0018:ffffc900020bfcc8 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff888039383be8 RCX: ffffffff82c1790a RDX: ffff888034e38000 RSI: ffffffff82c18063 RDI: ffff888034e38000 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888046851c80 R13: ffff888046851d58 R14: ffff88802bdacc80 R15: ffff888058814000 FS: 00007fbd7c4276c0(0000) GS:ffff8880d5ddc000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbd7c426ff8 CR3: 000000002d0d2000 CR4: 0000000000352ef0 Call Trace: vfs_symlink fs/namei.c:5660 [inline] vfs_symlink+0x178/0x4d0 fs/namei.c:5639 filename_symlinkat+0x2a6/0x560 fs/namei.c:5685 __do_sys_symlinkat fs/namei.c:5705 [inline] __se_sys_symlinkat fs/namei.c:5700 [inline] __x64_sys_symlinkat+0x9c/0xe0 fs/namei.c:5700 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fbd7b59de99 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fbd7c427028 EFLAGS: 00000246 ORIG_RAX: 000000000000010a RAX: ffffffffffffffda RBX: 00007fbd7b825fa0 RCX: 00007fbd7b59de99 RDX: 0000200000000340 RSI: ffffffffffffff9c RDI: 0000200000000300 RBP: 00007fbd7b633eaf R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fbd7b826038 R14: 00007fbd7b825fa0 R15: 00007fff25ff7358 --- 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 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. 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