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Tue, 27 Oct 2026 05:08:56 -0700 (PDT) Date: Tue, 27 Oct 2026 05:08:56 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6ae09458.f0fe5aea.79aa1.008d.GAE@google.com> Subject: [syzbot] WARNING in d_make_discardable From: syzbot To: 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: 5b0764a53235 Merge tag 'drm-next-2026-10-21' of https://gi.. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git console output: https://syzkaller.appspot.com/x/log.txt?x=15f3470d580000 kernel config: https://syzkaller.appspot.com/x/.config?x=6e9d69cbadaeb907 dashboard link: https://syzkaller.appspot.com/bug?extid=2e3c70a51d4ac0f6bdd9 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14089aa5580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+2e3c70a51d4ac0f6bdd9@syzkaller.appspotmail.com ------------[ cut here ]------------ !(dentry->d_flags & DCACHE_PERSISTENT) WARNING: fs/dcache.c:1063 at d_make_discardable+0x28e/0x2f0 fs/dcache.c:1063, CPU#3: syz-executor121/6123 Modules linked in: CPU: 3 UID: 0 PID: 6123 Comm: syz-executor121 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:d_make_discardable+0x28e/0x2f0 fs/dcache.c:1063 Code: 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 0f b6 04 02 84 c0 74 04 3c 03 7e 5b 83 0b 40 e9 2e ff ff ff e8 93 c5 69 ff 90 <0f> 0b 90 e9 c8 fd ff ff e8 05 d8 e2 ff e9 14 fe ff ff 48 89 df e8 RSP: 0018:ffffc900036b7280 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff88803d9b2680 RCX: 0000000000000001 RDX: ffff8880270e0000 RSI: ffffffff82a4457d RDI: ffff8880270e0000 RBP: 0000000000100080 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: dffffc0000000000 R14: ffff88803fc2e4e0 R15: ffff888046af5e80 FS: 00007ff6448646c0(0000) GS:ffff8880d47ba000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000056251a682e28 CR3: 0000000038934000 CR4: 0000000000352ef0 Call Trace: __simple_recursive_removal+0x276/0x5c0 fs/libfs.c:625 rpc_remove_client_dir+0xf0/0x140 net/sunrpc/rpc_pipe.c:898 __rpc_clnt_remove_pipedir net/sunrpc/clnt.c:100 [inline] __rpc_clnt_remove_pipedir net/sunrpc/clnt.c:97 [inline] rpc_client_register+0x605/0x6f0 net/sunrpc/clnt.c:333 rpc_new_client+0x977/0x1300 net/sunrpc/clnt.c:437 rpc_create_xprt+0xd9/0x440 net/sunrpc/clnt.c:483 rpc_create+0x46e/0x7f0 net/sunrpc/clnt.c:619 nfs_create_rpc_client+0x6a1/0x8f0 fs/nfs/client.c:575 nfs4_alloc_client+0x8f0/0xd70 fs/nfs/nfs4client.c:233 nfs_get_client+0x87b/0x1230 fs/nfs/client.c:468 nfs4_set_client+0x3f6/0x640 fs/nfs/nfs4client.c:757 nfs4_init_server.isra.0+0x5ad/0xf60 fs/nfs/nfs4client.c:1002 nfs4_create_server+0x185/0x2b0 fs/nfs/nfs4client.c:1051 nfs4_try_get_tree+0x93/0x140 fs/nfs/nfs4super.c:228 nfs_get_tree+0xa61/0x1450 fs/nfs/fs_context.c:1620 vfs_get_tree+0x92/0x320 fs/super.c:1943 fc_mount fs/namespace.c:1282 [inline] do_new_mount_fc fs/namespace.c:3910 [inline] do_new_mount fs/namespace.c:3986 [inline] path_mount+0x7d0/0x2850 fs/namespace.c:4337 do_mount fs/namespace.c:4350 [inline] __do_sys_mount fs/namespace.c:4565 [inline] __se_sys_mount fs/namespace.c:4542 [inline] __x64_sys_mount+0x293/0x310 fs/namespace.c:4542 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff64609d69a Code: 48 c7 c2 d0 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 d0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff6448640d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ffc99ea1760 RCX: 00007ff64609d69a RDX: 00007ff646109053 RSI: 00007ff6448640e0 RDI: 00007ff644864120 RBP: 00007ff644864160 R08: 00007ff644864160 R09: 00000000ffffffff R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff644864120 R13: 00007ff6448640e0 R14: 0000000000000003 R15: 0000000000000004 --- 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