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Sun, 08 Nov 2026 06:39:02 -0800 (PST) Date: Sun, 08 Nov 2026 06:39:02 -0800 In-Reply-To: <20261108140754.1057-1-drifabdelmalekmohamedsaid@gmail.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6af08986.5a668245.1aceb6.000f.GAE@google.com> Subject: Re: [syzbot] [nfs?] [net?] WARNING in svc_destroy From: syzbot To: drifabdelmalekmohamedsaid@gmail.com, linux-kernel@vger.kernel.org, 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 svc_destroy NFS: callback service start failed ------------[ cut here ]------------ SVC: permsocks remain for NFSv4 callback WARNING: net/sunrpc/svc.c:532 at svc_destroy+0x299/0x330 net/sunrpc/svc.c:532, CPU#1: syz-executor246/6020 Modules linked in: CPU: 1 UID: 0 PID: 6020 Comm: syz-executor246 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026 RIP: 0010:svc_destroy+0x29d/0x330 net/sunrpc/svc.c:532 Code: 48 b8 00 00 00 00 00 fc ff df 49 8b 5d 00 48 8d 7b 18 48 89 fa 48 c1 ea 03 80 3c 02 00 75 67 48 8d 3d 07 5e 77 07 48 8b 73 18 <67> 48 0f b9 3a e9 d0 fd ff ff 48 8b 7c 24 08 e8 8f 2c 85 f7 e9 a5 RSP: 0018:ffffc9000327f858 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffffffff9040bf80 RCX: 0000000000000000 RDX: 1ffffffff20817f3 RSI: ffffffff8c37ebc0 RDI: ffffffff927b0770 RBP: 0000000000000000 R08: 00000000ffffffff R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffff888020732000 R13: ffff88802e69dc00 R14: ffff888038dc4000 R15: ffffffff9cd624c0 FS: 000055556db93400(0000) GS:ffff888122575000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055cc9adb7968 CR3: 000000005b735000 CR4: 00000000003526f0 Call Trace: nfs_callback_up+0x511/0xb50 fs/nfs/callback.c:243 nfs4_init_callback fs/nfs/nfs4client.c:327 [inline] nfs4_init_client_minor_version fs/nfs/nfs4client.c:379 [inline] nfs4_init_client+0x236/0x420 fs/nfs/nfs4client.c:429 nfs_get_client+0xf38/0x1230 fs/nfs/client.c:467 nfs4_set_client+0x3f6/0x640 fs/nfs/nfs4client.c:763 nfs4_init_server.isra.0+0x5be/0xf80 fs/nfs/nfs4client.c:1014 nfs4_create_server+0x185/0x2b0 fs/nfs/nfs4client.c:1063 nfs4_try_get_tree+0x93/0x140 fs/nfs/nfs4super.c:228 nfs_get_tree+0xa61/0x1440 fs/nfs/fs_context.c:1621 vfs_get_tree+0x92/0x320 fs/super.c:1881 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: 0033:0x7f89d50d5f1a Code: 48 c7 c2 d8 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 d8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe2b5c7a48 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f89d50d5f1a RDX: 00007f89d513403f RSI: 00007f89d5133ffe RDI: 00007f89d5134044 RBP: 0000000000000004 R08: 00007ffe2b5c7ac0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f89d5133ffe R13: 0000000000001785 R14: 0000000000000801 R15: 00007ffe2b5c7ac0 ---------------- Code disassembly (best guess): 0: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 7: fc ff df a: 49 8b 5d 00 mov 0x0(%r13),%rbx e: 48 8d 7b 18 lea 0x18(%rbx),%rdi 12: 48 89 fa mov %rdi,%rdx 15: 48 c1 ea 03 shr $0x3,%rdx 19: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 1d: 75 67 jne 0x86 1f: 48 8d 3d 07 5e 77 07 lea 0x7775e07(%rip),%rdi # 0x7775e2d 26: 48 8b 73 18 mov 0x18(%rbx),%rsi * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: e9 d0 fd ff ff jmp 0xfffffe04 34: 48 8b 7c 24 08 mov 0x8(%rsp),%rdi 39: e8 8f 2c 85 f7 call 0xf7852ccd 3e: e9 .byte 0xe9 3f: a5 movsl %ds:(%rsi),%es:(%rdi) Tested on: commit: fa4ad798 Merge tag 'for-7.4-rc1-tag' of git://git.kern.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15b11409580000 kernel config: https://syzkaller.appspot.com/x/.config?x=1cf189394a856f11 dashboard link: https://syzkaller.appspot.com/bug?extid=8cbdf9aa6c281a4e6bbe compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 patch: https://syzkaller.appspot.com/x/patch.diff?x=10e11409580000