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X-Forwarded-Encrypted: i=1; AKwUvBx4zfEIZ+snsPp9lxAMtm2+vdO7kHv0rnV44uE5s480jii0DyIbuP4dHKw8pL5GFZyKLUKN2+ERSQ==@kvack.org X-Gm-Message-State: AFuF++mJPYrLejZ5Uql7bcMwBvCNaqcQ5cBzqB45/wnYW8kL7sIHTyRq 8LS5L6/xHt35cTZIKEheGBAfL8LSA4BK12GPcmh/MDomcpxtoakJD9vSEhYo/KUFKUvJzZYDmVU PxhjcbD2cDCfnlwNRUQRPWWcF/wMovzyGtuqxAbrhIuKXI4ZqMdhWqylInHc= MIME-Version: 1.0 X-Received: by 2002:a05:6808:c3d7:b0:4cb:f21c:a794 with SMTP id 5614622812f47-4f1b5dd6029mr744708b6e.28.1790763730224; Wed, 30 Sep 2026 03:22:10 -0700 (PDT) Date: Wed, 30 Sep 2026 03:22:10 -0700 In-Reply-To: <20260929034158.1455429-1-neilb@ownmail.net> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6abce2d2.64639fcc.9812d.000c.GAE@google.com> Subject: [syzbot ci] Re: multiple-filesystems: prepare for changes to VFS locking From: syzbot ci To: a.hindborg@kernel.org, amir73il@gmail.com, anton.ivanov@cambridgegreys.com, baolin.wang@linux.alibaba.com, brauner@kernel.org, cem@kernel.org, coda@cs.cmu.edu, codalist@coda.cs.cmu.edu, fuse-devel@lists.linux.dev, hughd@google.com, hyc.lee@gmail.com, jack@suse.cz, jaharkes@cs.cmu.edu, jlayton@kernel.org, joel.granados@kernel.org, johannes@sipsolutions.net, kees@kernel.org, leitao@debian.org, linkinjeon@kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-um@lists.infradead.org, linux-unionfs@vger.kernel.org, linux-xfs@vger.kernel.org, miklos@szeredi.hu, neilb@ownmail.net, ntfs@lists.linux.dev, richard@nod.at, viro@zeniv.linux.org.uk Cc: syzbot@lists.linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 33D48180006 X-Rspam-User: X-Stat-Signature: u1jtnfy1azg7fz6id3z7qzd989p539wj X-HE-Tag: 1790763731-75257 X-HE-Meta: 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 W6RbjSn2 WY6DumRvuInedQxQXhW9NQqBcc54qWOXEbaV4yIVA0wzv23BizLpag== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: syzbot ci has tested the following series [v1] multiple-filesystems: prepare for changes to VFS locking https://lore.kernel.org/all/20260929034158.1455429-1-neilb@ownmail.net * [PATCH 1/7] VFS/xfs/ntfs: drop parent lock across d_alloc_parallel() in d_add_ci() * [PATCH 2/7] shmem: use d_duplicate() * [PATCH 3/7] coda: don't d_drop() early. * [PATCH 4/7] configfs: remove d_add() calls before configfs_attach_group() * [PATCH 5/7] hostfs: don't d_drop() before d_splice_alias() in hostfs_mkdir() * [PATCH 6/7] procfs: drop parent lock for d_alloc_parallel() in iterate_shared() * [PATCH 7/7] ovl: stop using lookup_one() in ovl_iterate(). and found the following issue: WARNING in __d_instantiate Full report is available here: https://ci.syzbot.org/series/b87296ff-c49f-416e-834c-a886ea8bd6c3 *** WARNING in __d_instantiate tree: linux-next URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/next/linux-next base: 3879f51857325da9bf3cfb073280257cd16ae067 arch: amd64 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 config: https://ci.syzbot.org/builds/dd8fcfa5-13f0-458f-bd3b-9c06d4d67a78/config syz repro: https://ci.syzbot.org/findings/fdffe42d-ac1a-40d9-b05c-014808f5b0ec/syz_repro ------------[ cut here ]------------ d_in_lookup(dentry) WARNING: fs/dcache.c:2197 at __d_instantiate+0x3f4/0x700 fs/dcache.c:2197, CPU#1: syz.0.17/5823 Modules linked in: CPU: 1 UID: 0 PID: 5823 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:__d_instantiate+0x3f4/0x700 fs/dcache.c:2197 Code: 03 41 80 f6 01 41 0f b6 ce c1 e1 0d 09 c1 89 0b 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d e9 03 26 96 09 cc e8 0d 84 75 ff 90 <0f> 0b 90 e9 7f fd ff ff e8 ff 83 75 ff 41 81 cc 00 00 01 00 e9 34 RSP: 0018:ffffc900038d73a0 EFLAGS: 00010293 RAX: ffffffff825242a3 RBX: ffff8881b4eef380 RCX: ffff888169801e00 RDX: 0000000000000000 RSI: 0000000001000000 RDI: 0000000000000000 RBP: 0000000001000000 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff5200071ae6c R12: 0000000000280000 R13: dffffc0000000000 R14: ffff8881bc29f3e0 R15: ffff8881bc29f3e4 FS: 00007f15d1af96c0(0000) GS:ffff8882a8cc9000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000001000 CR3: 00000001bd5c4000 CR4: 00000000000006f0 Call Trace: d_make_persistent+0x8e/0x180 fs/dcache.c:3139 shmem_mknod+0x2d4/0x340 mm/shmem.c:3851 shmem_whiteout mm/shmem.c:3982 [inline] shmem_rename2+0x267/0x430 mm/shmem.c:4022 vfs_rename+0xbd9/0xef0 fs/namei.c:6219 ovl_do_rename_rd fs/overlayfs/overlayfs.h:371 [inline] ovl_check_rename_whiteout fs/overlayfs/super.c:593 [inline] ovl_make_workdir fs/overlayfs/super.c:713 [inline] ovl_get_workdir+0x93d/0x1980 fs/overlayfs/super.c:836 ovl_fill_super_creds fs/overlayfs/super.c:1449 [inline] ovl_fill_super+0x1702/0x4360 fs/overlayfs/super.c:1561 vfs_get_super fs/super.c:1405 [inline] get_tree_nodev+0xbb/0x150 fs/super.c:1424 vfs_get_tree+0x92/0x2a0 fs/super.c:1947 fc_mount fs/namespace.c:1198 [inline] do_new_mount_fc fs/namespace.c:3772 [inline] do_new_mount+0x319/0xdc0 fs/namespace.c:3848 do_mount fs/namespace.c:4181 [inline] __do_sys_mount fs/namespace.c:4397 [inline] __se_sys_mount+0x31d/0x420 fs/namespace.c:4374 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: 0033:0x7f15d0b9e159 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:00007f15d1af9028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f15d0e25fa0 RCX: 00007f15d0b9e159 RDX: 0000200000000440 RSI: 0000200000000100 RDI: 0000000000000000 RBP: 00007f15d0c3506b R08: 0000200000000080 R09: 0000000000000000 R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f15d0e26038 R14: 00007f15d0e25fa0 R15: 00007ffe9e1b3308 *** If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: syzbot@syzkaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@googlegroups.com. To test a fix for this bug, please reply with `#syz test` (on a separate line) and attach the patch to the email. Notes: - The patch will be applied on top of the tested series (as an incremental fix). - To test a new version of the whole series, please send it directly to syzbot@lists.linux.dev. - Arguments like custom git repos and branches are not supported.