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List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:822:b0:659:9a49:9051 with SMTP id 006d021491bc7-65b45186c38mr6021339eaf.28.1765873084636; Tue, 16 Dec 2025 00:18:04 -0800 (PST) Date: Tue, 16 Dec 2025 00:18:04 -0800 In-Reply-To: <20251216080211.16752-1-kartikey406@gmail.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <694115bc.a70a0220.104cf0.0349.GAE@google.com> Subject: Re: [syzbot] [nfs?] memory leak in percpu_ref_init From: syzbot To: kartikey406@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: memory leak in percpu_ref_init 2025/12/16 08:16:45 executed programs: 5 BUG: memory leak unreferenced object (percpu) 0x607e4d6bf800 (size 8): comm "syz.0.17", pid 6716, jiffies 4294946723 hex dump (first 8 bytes on cpu 0): 00 00 00 00 00 00 00 00 ........ backtrace (crc 0): pcpu_alloc_noprof+0x82c/0xd60 mm/percpu.c:1890 percpu_ref_init+0x36/0x1e0 lib/percpu-refcount.c:72 nfsd_create_serv+0xc5/0x270 fs/nfsd/nfssvc.c:605 nfsd_nl_listener_set_doit+0x62/0xb00 fs/nfsd/nfsctl.c:1882 genl_family_rcv_msg_doit+0x11e/0x190 net/netlink/genetlink.c:1115 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] genl_rcv_msg+0x2fd/0x440 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x93/0x1d0 net/netlink/af_netlink.c:2550 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x3a3/0x4f0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x335/0x6b0 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] ____sys_sendmsg+0x562/0x5a0 net/socket.c:2592 ___sys_sendmsg+0xc8/0x130 net/socket.c:2646 __sys_sendmsg+0xc7/0x140 net/socket.c:2678 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f BUG: memory leak unreferenced object 0xffff88811b287b80 (size 64): comm "syz.0.17", pid 6716, jiffies 4294946723 hex dump (first 32 bytes): 01 00 00 00 00 00 00 80 40 68 d7 81 ff ff ff ff ........@h...... 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace (crc a8b59ccf): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4958 [inline] slab_alloc_node mm/slub.c:5263 [inline] __kmalloc_cache_noprof+0x3b2/0x570 mm/slub.c:5771 kmalloc_noprof include/linux/slab.h:957 [inline] kzalloc_noprof include/linux/slab.h:1094 [inline] percpu_ref_init+0x94/0x1e0 lib/percpu-refcount.c:76 nfsd_create_serv+0xc5/0x270 fs/nfsd/nfssvc.c:605 nfsd_nl_listener_set_doit+0x62/0xb00 fs/nfsd/nfsctl.c:1882 genl_family_rcv_msg_doit+0x11e/0x190 net/netlink/genetlink.c:1115 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] genl_rcv_msg+0x2fd/0x440 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x93/0x1d0 net/netlink/af_netlink.c:2550 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x3a3/0x4f0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x335/0x6b0 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] ____sys_sendmsg+0x562/0x5a0 net/socket.c:2592 ___sys_sendmsg+0xc8/0x130 net/socket.c:2646 __sys_sendmsg+0xc7/0x140 net/socket.c:2678 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f BUG: memory leak unreferenced object (percpu) 0x607e4d6c0e48 (size 8): comm "syz.0.18", pid 6721, jiffies 4294946724 hex dump (first 8 bytes on cpu 0): 00 00 00 00 00 00 00 00 ........ backtrace (crc 0): pcpu_alloc_noprof+0x82c/0xd60 mm/percpu.c:1890 percpu_ref_init+0x36/0x1e0 lib/percpu-refcount.c:72 nfsd_create_serv+0xc5/0x270 fs/nfsd/nfssvc.c:605 nfsd_nl_listener_set_doit+0x62/0xb00 fs/nfsd/nfsctl.c:1882 genl_family_rcv_msg_doit+0x11e/0x190 net/netlink/genetlink.c:1115 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] genl_rcv_msg+0x2fd/0x440 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x93/0x1d0 net/netlink/af_netlink.c:2550 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x3a3/0x4f0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x335/0x6b0 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] ____sys_sendmsg+0x562/0x5a0 net/socket.c:2592 ___sys_sendmsg+0xc8/0x130 net/socket.c:2646 __sys_sendmsg+0xc7/0x140 net/socket.c:2678 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f BUG: memory leak unreferenced object 0xffff88810a3af280 (size 64): comm "syz.0.18", pid 6721, jiffies 4294946724 hex dump (first 32 bytes): 01 00 00 00 00 00 00 80 40 68 d7 81 ff ff ff ff ........@h...... 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace (crc a8b59ccf): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4958 [inline] slab_alloc_node mm/slub.c:5263 [inline] __kmalloc_cache_noprof+0x3b2/0x570 mm/slub.c:5771 kmalloc_noprof include/linux/slab.h:957 [inline] kzalloc_noprof include/linux/slab.h:1094 [inline] percpu_ref_init+0x94/0x1e0 lib/percpu-refcount.c:76 nfsd_create_serv+0xc5/0x270 fs/nfsd/nfssvc.c:605 nfsd_nl_listener_set_doit+0x62/0xb00 fs/nfsd/nfsctl.c:1882 genl_family_rcv_msg_doit+0x11e/0x190 net/netlink/genetlink.c:1115 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] genl_rcv_msg+0x2fd/0x440 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x93/0x1d0 net/netlink/af_netlink.c:2550 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x3a3/0x4f0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x335/0x6b0 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] ____sys_sendmsg+0x562/0x5a0 net/socket.c:2592 ___sys_sendmsg+0xc8/0x130 net/socket.c:2646 __sys_sendmsg+0xc7/0x140 net/socket.c:2678 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f BUG: memory leak unreferenced object (percpu) 0x607e4d6c0e50 (size 8): comm "syz.0.19", pid 6726, jiffies 4294946725 hex dump (first 8 bytes on cpu 0): 00 00 00 00 00 00 00 00 ........ backtrace (crc 0): pcpu_alloc_noprof+0x82c/0xd60 mm/percpu.c:1890 percpu_ref_init+0x36/0x1e0 lib/percpu-refcount.c:72 nfsd_create_serv+0xc5/0x270 fs/nfsd/nfssvc.c:605 nfsd_nl_listener_set_doit+0x62/0xb00 fs/nfsd/nfsctl.c:1882 genl_family_rcv_msg_doit+0x11e/0x190 net/netlink/genetlink.c:1115 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] genl_rcv_msg+0x2fd/0x440 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x93/0x1d0 net/netlink/af_netlink.c:2550 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x3a3/0x4f0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x335/0x6b0 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] ____sys_sendmsg+0x562/0x5a0 net/socket.c:2592 ___sys_sendmsg+0xc8/0x130 net/socket.c:2646 __sys_sendmsg+0xc7/0x140 net/socket.c:2678 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f connection error: failed to recv *flatrpc.ExecutorMessageRawT: EOF Tested on: commit: 8f0b4cce Linux 6.19-rc1 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=152c231a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=d60836e327fd6756 dashboard link: https://syzkaller.appspot.com/bug?extid=6ee3b889bdeada0a6226 compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=1489e184580000