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Wed, 30 Sep 2026 03:19:09 -0700 (PDT) Date: Wed, 30 Sep 2026 03:19:09 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6abce21d.80e1c6cc.22483f.0000.GAE@google.com> Subject: [moderation/CI] Re: multiple-filesystems: prepare for changes to VFS locking From: syzbot ci To: syzkaller-upstream-moderation@googlegroups.com Cc: syzbot@lists.linux.dev Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable 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_mkdi= r() * [PATCH 6/7] procfs: drop parent lock for d_alloc_parallel() in iterate_sh= ared() * [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/li= nux-next base: 3879f51857325da9bf3cfb073280257cd16ae067 arch: amd64 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp= 1~20260613092250.77), Debian LLD 22.1.8 config: https://ci.syzbot.org/builds/dd8fcfa5-13f0-458f-bd3b-9c06d4d67a7= 8/config syz repro: https://ci.syzbot.org/findings/fdffe42d-ac1a-40d9-b05c-014808f5b= 0ec/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(ful= l)=20 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 f= d 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:000000000000000= 0 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 f= f 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. 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