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(PDT) Date: Sun, 19 Jul 2026 01:58:44 -0700 In-Reply-To: <69eacf39.a00a0220.17a17.004d.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a5c91c4.42649fcc.6186.0071.GAE@google.com> Subject: Forwarded: Re: [syzbot] [net?] [virt?] memory leak in __vsock_create (2) From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable For archival purposes, forwarding an incoming command email to linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com. *** Subject: Re: [syzbot] [net?] [virt?] memory leak in __vsock_create (2) Author: phind.uet@gmail.com #syz test: git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master On Sun, Jul 19, 2026 at 3:47=E2=80=AFPM syzbot wrote: > > Hello, > > syzbot has tested the proposed patch but the reproducer is still triggeri= ng an issue: > memory leak in __vsock_create > > 2026/07/19 07:45:48 executed programs: 5 > BUG: memory leak > unreferenced object 0xffff888113812d00 (size 1272): > comm "kworker/1:2", pid 3105, jiffies 4294947499 > hex dump (first 32 bytes): > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > 28 00 0b 40 00 00 00 00 00 00 00 00 00 00 00 00 (..@............ > backtrace (crc 3df84e77): > kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] > slab_post_alloc_hook mm/slub.c:4593 [inline] > slab_alloc_node mm/slub.c:4893 [inline] > kmem_cache_alloc_noprof+0x388/0x410 mm/slub.c:4907 > sk_prot_alloc+0x3e/0x1b0 net/core/sock.c:2246 > sk_alloc+0x36/0x3d0 net/core/sock.c:2308 > __vsock_create.constprop.0+0x38/0x2f0 net/vmw_vsock/af_vsock.c:919 > virtio_transport_recv_listen net/vmw_vsock/virtio_transport_common.c:= 1555 [inline] > virtio_transport_recv_pkt+0x904/0xf80 net/vmw_vsock/virtio_transport_= common.c:1681 > vsock_loopback_work+0x104/0x140 net/vmw_vsock/vsock_loopback.c:142 > process_one_work+0x2b8/0x600 kernel/workqueue.c:3375 > process_scheduled_works kernel/workqueue.c:3458 [inline] > worker_thread+0x255/0x4a0 kernel/workqueue.c:3539 > kthread+0x14e/0x1a0 kernel/kthread.c:436 > ret_from_fork+0x219/0x490 arch/x86/kernel/process.c:158 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 > > BUG: memory leak > unreferenced object 0xffff888117aa8980 (size 32): > comm "kworker/1:2", pid 3105, jiffies 4294947499 > hex dump (first 32 bytes): > f8 52 0a 00 81 88 ff ff 00 00 00 00 00 00 00 00 .R.............. > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > backtrace (crc 42a7bc0e): > kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] > slab_post_alloc_hook mm/slub.c:4593 [inline] > slab_alloc_node mm/slub.c:4893 [inline] > __do_kmalloc_node mm/slub.c:5310 [inline] > __kmalloc_noprof+0x3f8/0x540 mm/slub.c:5336 > _kmalloc_noprof include/linux/slab.h:988 [inline] > _kzalloc_noprof include/linux/slab.h:1305 [inline] > lsm_blob_alloc+0x4d/0x80 security/security.c:218 > lsm_sock_alloc security/security.c:4477 [inline] > security_sk_alloc+0x2d/0x290 security/security.c:4493 > sk_prot_alloc+0x8f/0x1b0 net/core/sock.c:2255 > sk_alloc+0x36/0x3d0 net/core/sock.c:2308 > __vsock_create.constprop.0+0x38/0x2f0 net/vmw_vsock/af_vsock.c:919 > virtio_transport_recv_listen net/vmw_vsock/virtio_transport_common.c:= 1555 [inline] > virtio_transport_recv_pkt+0x904/0xf80 net/vmw_vsock/virtio_transport_= common.c:1681 > vsock_loopback_work+0x104/0x140 net/vmw_vsock/vsock_loopback.c:142 > process_one_work+0x2b8/0x600 kernel/workqueue.c:3375 > process_scheduled_works kernel/workqueue.c:3458 [inline] > worker_thread+0x255/0x4a0 kernel/workqueue.c:3539 > kthread+0x14e/0x1a0 kernel/kthread.c:436 > ret_from_fork+0x219/0x490 arch/x86/kernel/process.c:158 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 > > BUG: memory leak > unreferenced object 0xffff8881122fe5a0 (size 96): > comm "kworker/1:2", pid 3105, jiffies 4294947499 > hex dump (first 32 bytes): > 00 2d 81 13 81 88 ff ff 00 00 00 00 00 00 00 00 .-.............. > 00 00 00 00 00 00 00 00 00 00 04 00 00 00 00 00 ................ > backtrace (crc 159c7144): > kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] > slab_post_alloc_hook mm/slub.c:4593 [inline] > slab_alloc_node mm/slub.c:4893 [inline] > __kmalloc_cache_noprof+0x38c/0x420 mm/slub.c:5456 > _kmalloc_noprof include/linux/slab.h:984 [inline] > _kzalloc_noprof include/linux/slab.h:1305 [inline] > virtio_transport_do_socket_init+0x2b/0xf0 net/vmw_vsock/virtio_transp= ort_common.c:907 > vsock_assign_transport+0x3a3/0x460 net/vmw_vsock/af_vsock.c:670 > virtio_transport_recv_listen net/vmw_vsock/virtio_transport_common.c:= 1571 [inline] > virtio_transport_recv_pkt+0x95c/0xf80 net/vmw_vsock/virtio_transport_= common.c:1681 > vsock_loopback_work+0x104/0x140 net/vmw_vsock/vsock_loopback.c:142 > process_one_work+0x2b8/0x600 kernel/workqueue.c:3375 > process_scheduled_works kernel/workqueue.c:3458 [inline] > worker_thread+0x255/0x4a0 kernel/workqueue.c:3539 > kthread+0x14e/0x1a0 kernel/kthread.c:436 > ret_from_fork+0x219/0x490 arch/x86/kernel/process.c:158 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 > > BUG: memory leak > unreferenced object 0xffff888113812800 (size 1272): > comm "kworker/1:2", pid 3105, jiffies 4294947499 > hex dump (first 32 bytes): > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > 28 00 0b 40 00 00 00 00 00 00 00 00 00 00 00 00 (..@............ > backtrace (crc 4993b404): > kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] > slab_post_alloc_hook mm/slub.c:4593 [inline] > slab_alloc_node mm/slub.c:4893 [inline] > kmem_cache_alloc_noprof+0x388/0x410 mm/slub.c:4907 > sk_prot_alloc+0x3e/0x1b0 net/core/sock.c:2246 > sk_alloc+0x36/0x3d0 net/core/sock.c:2308 > __vsock_create.constprop.0+0x38/0x2f0 net/vmw_vsock/af_vsock.c:919 > virtio_transport_recv_listen net/vmw_vsock/virtio_transport_common.c:= 1555 [inline] > virtio_transport_recv_pkt+0x904/0xf80 net/vmw_vsock/virtio_transport_= common.c:1681 > vsock_loopback_work+0x104/0x140 net/vmw_vsock/vsock_loopback.c:142 > process_one_work+0x2b8/0x600 kernel/workqueue.c:3375 > process_scheduled_works kernel/workqueue.c:3458 [inline] > worker_thread+0x255/0x4a0 kernel/workqueue.c:3539 > kthread+0x14e/0x1a0 kernel/kthread.c:436 > ret_from_fork+0x219/0x490 arch/x86/kernel/process.c:158 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 > > BUG: memory leak > unreferenced object 0xffff888117aa8320 (size 32): > comm "kworker/1:2", pid 3105, jiffies 4294947499 > hex dump (first 32 bytes): > f8 52 0a 00 81 88 ff ff 00 00 00 00 00 00 00 00 .R.............. > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > backtrace (crc 42a7bc0e): > kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] > slab_post_alloc_hook mm/slub.c:4593 [inline] > slab_alloc_node mm/slub.c:4893 [inline] > __do_kmalloc_node mm/slub.c:5310 [inline] > __kmalloc_noprof+0x3f8/0x540 mm/slub.c:5336 > _kmalloc_noprof include/linux/slab.h:988 [inline] > _kzalloc_noprof include/linux/slab.h:1305 [inline] > lsm_blob_alloc+0x4d/0x80 security/security.c:218 > lsm_sock_alloc security/security.c:4477 [inline] > security_sk_alloc+0x2d/0x290 security/security.c:4493 > sk_prot_alloc+0x8f/0x1b0 net/core/sock.c:2255 > sk_alloc+0x36/0x3d0 net/core/sock.c:2308 > __vsock_create.constprop.0+0x38/0x2f0 net/vmw_vsock/af_vsock.c:919 > virtio_transport_recv_listen net/vmw_vsock/virtio_transport_common.c:= 1555 [inline] > virtio_transport_recv_pkt+0x904/0xf80 net/vmw_vsock/virtio_transport_= common.c:1681 > vsock_loopback_work+0x104/0x140 net/vmw_vsock/vsock_loopback.c:142 > process_one_work+0x2b8/0x600 kernel/workqueue.c:3375 > process_scheduled_works kernel/workqueue.c:3458 [inline] > worker_thread+0x255/0x4a0 kernel/workqueue.c:3539 > kthread+0x14e/0x1a0 kernel/kthread.c:436 > ret_from_fork+0x219/0x490 arch/x86/kernel/process.c:158 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 > > BUG: memory leak > unreferenced object 0xffff88811756a000 (size 96): > comm "kworker/1:2", pid 3105, jiffies 4294947499 > hex dump (first 32 bytes): > 00 28 81 13 81 88 ff ff 00 00 00 00 00 00 00 00 .(.............. > 00 00 00 00 00 00 00 00 00 00 04 00 00 00 00 00 ................ > backtrace (crc 87703aa0): > kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] > slab_post_alloc_hook mm/slub.c:4593 [inline] > slab_alloc_node mm/slub.c:4893 [inline] > __kmalloc_cache_noprof+0x38c/0x420 mm/slub.c:5456 > _kmalloc_noprof include/linux/slab.h:984 [inline] > _kzalloc_noprof include/linux/slab.h:1305 [inline] > virtio_transport_do_socket_init+0x2b/0xf0 net/vmw_vsock/virtio_transp= ort_common.c:907 > vsock_assign_transport+0x3a3/0x460 net/vmw_vsock/af_vsock.c:670 > virtio_transport_recv_listen net/vmw_vsock/virtio_transport_common.c:= 1571 [inline] > virtio_transport_recv_pkt+0x95c/0xf80 net/vmw_vsock/virtio_transport_= common.c:1681 > vsock_loopback_work+0x104/0x140 net/vmw_vsock/vsock_loopback.c:142 > process_one_work+0x2b8/0x600 kernel/workqueue.c:3375 > process_scheduled_works kernel/workqueue.c:3458 [inline] > worker_thread+0x255/0x4a0 kernel/workqueue.c:3539 > kthread+0x14e/0x1a0 kernel/kthread.c:436 > ret_from_fork+0x219/0x490 arch/x86/kernel/process.c:158 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 > > connection error: failed to recv *flatrpc.ExecutorMessageRawT: EOF > > > Tested on: > > commit: 0718283a Add linux-next specific files for 20260717 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=3D13c222b958000= 0 > kernel config: https://syzkaller.appspot.com/x/.config?x=3Df74727dd1edec= 112 > dashboard link: https://syzkaller.appspot.com/bug?extid=3D1b2c9c4a0f87080= 82678 > compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for D= ebian) 2.44 > > Note: no patches were applied.