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AJvYcCXztpuyumqGE2ejxHk9cDKRieohKRIMunnFvs/F5Az8hSJM/ESnIlir+sxSbQOGrZyI5YU5/yGbZ/yekUL2@vger.kernel.org X-Gm-Message-State: AOJu0Yzk0iFuFDF4VzyKs8T1dJUZytQ0S/PlDRV2zhjcECzwwSqLnp70 mLxp4ebJ0FG4+VFAsvAvKP5ppLGpNlmRK+HPhLF4TbR6njWZBXS2iRoB93bZPSVU8Jb5A38o1ya EKjfAX0piCcIbK1BsGMBoa072hYSVxGkmC5BVq48x7mE25CO4NKxdUw4Mx30= X-Google-Smtp-Source: AGHT+IHMsUBvllSPOWNH3mzk9gY/mOONXfjQrjflwIbmJia2Po5mLC14f+svSUNKr8qysIk1kvoHJSNdZ6cI89kUwsu/ZcPrelw5 Precedence: bulk X-Mailing-List: linux-unionfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a92:cda2:0:b0:433:2091:8a86 with SMTP id e9e14a558f8ab-435dd050f5emr117822475ab.6.1764287762152; Thu, 27 Nov 2025 15:56:02 -0800 (PST) Date: Thu, 27 Nov 2025 15:56:02 -0800 In-Reply-To: <20251127234129.9487-1-hdanton@sina.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6928e512.a70a0220.d98e3.0124.GAE@google.com> Subject: Re: [syzbot] [overlayfs?] WARNING in shmem_unlink (2) From: syzbot To: amir73il@gmail.com, brauner@kernel.org, hdanton@sina.com, linux-kernel@vger.kernel.org, linux-unionfs@vger.kernel.org, miklos@szeredi.hu, neilb@ownmail.net, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: WARNING in shmem_unlink ------------[ cut here ]------------ WARNING: CPU: 1 PID: 6869 at fs/inode.c:417 drop_nlink+0xc5/0x110 fs/inode.c:417 Modules linked in: CPU: 1 UID: 0 PID: 6869 Comm: syz.0.58 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:drop_nlink+0xc5/0x110 fs/inode.c:417 Code: c0 08 00 00 be 08 00 00 00 e8 37 6a ec ff f0 48 ff 83 c0 08 00 00 5b 41 5c 41 5e 41 5f 5d c3 cc cc cc cc cc e8 0c a6 8a 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:ffffc90003bd7288 EFLAGS: 00010293 RAX: ffffffff82340734 RBX: ffff8880592bec40 RCX: ffff88802957da00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: fffff5200077ae49 R12: 1ffff1100b257d91 R13: 000000006928e4cf R14: ffff8880592bec88 R15: dffffc0000000000 FS: 00007fecf3ad56c0(0000) GS:ffff888126ef4000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fecf3ad4f98 CR3: 0000000039a9c000 CR4: 00000000003526f0 Call Trace: shmem_unlink+0x1f5/0x2d0 mm/shmem.c:3979 shmem_rename2+0x22d/0x360 mm/shmem.c:4065 vfs_rename+0xb34/0xe80 fs/namei.c:5216 ovl_do_rename+0x13c/0x210 fs/overlayfs/overlayfs.h:373 ovl_create_over_whiteout fs/overlayfs/dir.c:550 [inline] ovl_create_or_link+0xaf7/0x1410 fs/overlayfs/dir.c:656 ovl_create_object+0x234/0x310 fs/overlayfs/dir.c:695 lookup_open fs/namei.c:3796 [inline] open_last_lookups fs/namei.c:3895 [inline] path_openat+0x1500/0x3840 fs/namei.c:4131 do_filp_open+0x1fa/0x410 fs/namei.c:4161 do_sys_openat2+0x121/0x1c0 fs/open.c:1437 do_sys_open fs/open.c:1452 [inline] __do_sys_openat fs/open.c:1468 [inline] __se_sys_openat fs/open.c:1463 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1463 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: 0033:0x7fecf448f749 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:00007fecf3ad5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fecf46e6090 RCX: 00007fecf448f749 RDX: 0000000000105042 RSI: 0000200000000080 RDI: ffffffffffffff9c RBP: 00007fecf4513f91 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000000001ff R11: 0000000000000246 R12: 0000000000000000 R13: 00007fecf46e6128 R14: 00007fecf46e6090 R15: 00007ffc02c45398 Tested on: commit: e1afacb6 Merge tag 'ceph-for-6.18-rc8' of https://gith.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11681f42580000 kernel config: https://syzkaller.appspot.com/x/.config?x=38a0c4cddc846161 dashboard link: https://syzkaller.appspot.com/bug?extid=bfc9a0ccf0de47d04e8c compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 Note: no patches were applied.