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memory leak in __vsock_create (2)

Status: upstream: reported C repro on 2026/04/24 02:02
Subsystems: virt net
[Documentation on labels]
Reported-by: syzbot+1b2c9c4a0f8708082678@syzkaller.appspotmail.com
First crash: 68d, last: 46d
▶ ▼ Discussions (2)
Title Replies (including bot) Last reply
[PATCH] vsock/virtio: fix memory leak in virtio_transport_recv_listen() 1 (1) 2026/04/24 15:03
[syzbot] [virt?] [net?] memory leak in __vsock_create (2) 0 (2) 2026/04/24 05:18
▶ ▼ Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream memory leak in __vsock_create net virt io-uring 3 C 1 1480d 1476d 22/29 fixed on 2023/02/24 13:50
▶ ▼ Last patch testing requests (5)
Created Duration User Patch Repo Result
2026/04/24 05:18 29m kartikey406@gmail.com patch upstream OK log
2026/03/24 04:08 12m retest repro upstream report log
2026/03/24 03:59 12m retest repro upstream report log
2026/03/01 16:13 29m retest repro upstream report log
2026/03/01 16:08 16m retest repro upstream report log

Sample crash report:
2026/03/09 23:37:29 executed programs: 5
BUG: memory leak
unreferenced object 0xffff888128bb6d00 (size 1272):
  comm "kworker/0:1", pid 10, jiffies 4294944453
  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 31367ed9):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4547 [inline]
    slab_alloc_node mm/slub.c:4869 [inline]
    kmem_cache_alloc_noprof+0x372/0x480 mm/slub.c:4876
    sk_prot_alloc+0x3e/0x1b0 net/core/sock.c:2239
    sk_alloc+0x36/0x460 net/core/sock.c:2301
    __vsock_create.constprop.0+0x38/0x2f0 net/vmw_vsock/af_vsock.c:893
    virtio_transport_recv_listen net/vmw_vsock/virtio_transport_common.c:1557 [inline]
    virtio_transport_recv_pkt+0x855/0xfc0 net/vmw_vsock/virtio_transport_common.c:1685
    vsock_loopback_work+0x104/0x140 net/vmw_vsock/vsock_loopback.c:142
    process_one_work+0x26c/0x5d0 kernel/workqueue.c:3275
    process_scheduled_works kernel/workqueue.c:3358 [inline]
    worker_thread+0x243/0x490 kernel/workqueue.c:3439
    kthread+0x14e/0x1a0 kernel/kthread.c:436
    ret_from_fork+0x23c/0x4b0 arch/x86/kernel/process.c:158
    ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

BUG: memory leak
unreferenced object 0xffff8881141e93a0 (size 32):
  comm "kworker/0:1", pid 10, jiffies 4294944453
  hex dump (first 32 bytes):
    f8 6e 0a 00 81 88 ff ff 00 00 00 00 00 00 00 00  .n..............
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace (crc e7f5c8b3):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4547 [inline]
    slab_alloc_node mm/slub.c:4869 [inline]
    __do_kmalloc_node mm/slub.c:5262 [inline]
    __kmalloc_noprof+0x3bd/0x560 mm/slub.c:5275
    kmalloc_noprof include/linux/slab.h:954 [inline]
    kzalloc_noprof include/linux/slab.h:1188 [inline]
    lsm_blob_alloc+0x4d/0x80 security/security.c:192
    lsm_sock_alloc security/security.c:4375 [inline]
    security_sk_alloc+0x2d/0x290 security/security.c:4391
    sk_prot_alloc+0x8f/0x1b0 net/core/sock.c:2248
    sk_alloc+0x36/0x460 net/core/sock.c:2301
    __vsock_create.constprop.0+0x38/0x2f0 net/vmw_vsock/af_vsock.c:893
    virtio_transport_recv_listen net/vmw_vsock/virtio_transport_common.c:1557 [inline]
    virtio_transport_recv_pkt+0x855/0xfc0 net/vmw_vsock/virtio_transport_common.c:1685
    vsock_loopback_work+0x104/0x140 net/vmw_vsock/vsock_loopback.c:142
    process_one_work+0x26c/0x5d0 kernel/workqueue.c:3275
    process_scheduled_works kernel/workqueue.c:3358 [inline]
    worker_thread+0x243/0x490 kernel/workqueue.c:3439
    kthread+0x14e/0x1a0 kernel/kthread.c:436
    ret_from_fork+0x23c/0x4b0 arch/x86/kernel/process.c:158
    ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

BUG: memory leak
unreferenced object 0xffff888128bfa8a0 (size 96):
  comm "kworker/0:1", pid 10, jiffies 4294944453
  hex dump (first 32 bytes):
    00 6d bb 28 81 88 ff ff 00 00 00 00 00 00 00 00  .m.(............
    00 00 00 00 00 00 00 00 00 00 04 00 00 00 00 00  ................
  backtrace (crc 1fd60988):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4547 [inline]
    slab_alloc_node mm/slub.c:4869 [inline]
    __kmalloc_cache_noprof+0x377/0x480 mm/slub.c:5378
    kmalloc_noprof include/linux/slab.h:950 [inline]
    kzalloc_noprof include/linux/slab.h:1188 [inline]
    virtio_transport_do_socket_init+0x2b/0xf0 net/vmw_vsock/virtio_transport_common.c:923
    vsock_assign_transport+0x309/0x3a0 net/vmw_vsock/af_vsock.c:642
    virtio_transport_recv_listen net/vmw_vsock/virtio_transport_common.c:1575 [inline]
    virtio_transport_recv_pkt+0x8bc/0xfc0 net/vmw_vsock/virtio_transport_common.c:1685
    vsock_loopback_work+0x104/0x140 net/vmw_vsock/vsock_loopback.c:142
    process_one_work+0x26c/0x5d0 kernel/workqueue.c:3275
    process_scheduled_works kernel/workqueue.c:3358 [inline]
    worker_thread+0x243/0x490 kernel/workqueue.c:3439
    kthread+0x14e/0x1a0 kernel/kthread.c:436
    ret_from_fork+0x23c/0x4b0 arch/x86/kernel/process.c:158
    ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

BUG: memory leak
unreferenced object 0xffff888129e1e800 (size 1272):
  comm "kworker/1:3", pid 5832, jiffies 4294944454
  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 4bfb7c57):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4547 [inline]
    slab_alloc_node mm/slub.c:4869 [inline]
    kmem_cache_alloc_noprof+0x372/0x480 mm/slub.c:4876
    sk_prot_alloc+0x3e/0x1b0 net/core/sock.c:2239
    sk_alloc+0x36/0x460 net/core/sock.c:2301
    __vsock_create.constprop.0+0x38/0x2f0 net/vmw_vsock/af_vsock.c:893
    virtio_transport_recv_listen net/vmw_vsock/virtio_transport_common.c:1557 [inline]
    virtio_transport_recv_pkt+0x855/0xfc0 net/vmw_vsock/virtio_transport_common.c:1685
    vsock_loopback_work+0x104/0x140 net/vmw_vsock/vsock_loopback.c:142
    process_one_work+0x26c/0x5d0 kernel/workqueue.c:3275
    process_scheduled_works kernel/workqueue.c:3358 [inline]
    worker_thread+0x243/0x490 kernel/workqueue.c:3439
    kthread+0x14e/0x1a0 kernel/kthread.c:436
    ret_from_fork+0x23c/0x4b0 arch/x86/kernel/process.c:158
    ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

BUG: memory leak
unreferenced object 0xffff888114372e80 (size 32):
  comm "kworker/1:3", pid 5832, jiffies 4294944454
  hex dump (first 32 bytes):
    f8 6e 0a 00 81 88 ff ff 00 00 00 00 00 00 00 00  .n..............
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace (crc e7f5c8b3):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4547 [inline]
    slab_alloc_node mm/slub.c:4869 [inline]
    __do_kmalloc_node mm/slub.c:5262 [inline]
    __kmalloc_noprof+0x3bd/0x560 mm/slub.c:5275
    kmalloc_noprof include/linux/slab.h:954 [inline]
    kzalloc_noprof include/linux/slab.h:1188 [inline]
    lsm_blob_alloc+0x4d/0x80 security/security.c:192
    lsm_sock_alloc security/security.c:4375 [inline]
    security_sk_alloc+0x2d/0x290 security/security.c:4391
    sk_prot_alloc+0x8f/0x1b0 net/core/sock.c:2248
    sk_alloc+0x36/0x460 net/core/sock.c:2301
    __vsock_create.constprop.0+0x38/0x2f0 net/vmw_vsock/af_vsock.c:893
    virtio_transport_recv_listen net/vmw_vsock/virtio_transport_common.c:1557 [inline]
    virtio_transport_recv_pkt+0x855/0xfc0 net/vmw_vsock/virtio_transport_common.c:1685
    vsock_loopback_work+0x104/0x140 net/vmw_vsock/vsock_loopback.c:142
    process_one_work+0x26c/0x5d0 kernel/workqueue.c:3275
    process_scheduled_works kernel/workqueue.c:3358 [inline]
    worker_thread+0x243/0x490 kernel/workqueue.c:3439
    kthread+0x14e/0x1a0 kernel/kthread.c:436
    ret_from_fork+0x23c/0x4b0 arch/x86/kernel/process.c:158
    ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

BUG: memory leak
unreferenced object 0xffff8881054d0ea0 (size 96):
  comm "kworker/1:3", pid 5832, jiffies 4294944454
  hex dump (first 32 bytes):
    00 e8 e1 29 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 72501265):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4547 [inline]
    slab_alloc_node mm/slub.c:4869 [inline]
    __kmalloc_cache_noprof+0x377/0x480 mm/slub.c:5378
    kmalloc_noprof include/linux/slab.h:950 [inline]
    kzalloc_noprof include/linux/slab.h:1188 [inline]
    virtio_transport_do_socket_init+0x2b/0xf0 net/vmw_vsock/virtio_transport_common.c:923
    vsock_assign_transport+0x309/0x3a0 net/vmw_vsock/af_vsock.c:642
    virtio_transport_recv_listen net/vmw_vsock/virtio_transport_common.c:1575 [inline]
    virtio_transport_recv_pkt+0x8bc/0xfc0 net/vmw_vsock/virtio_transport_common.c:1685
    vsock_loopback_work+0x104/0x140 net/vmw_vsock/vsock_loopback.c:142
    process_one_work+0x26c/0x5d0 kernel/workqueue.c:3275
    process_scheduled_works kernel/workqueue.c:3358 [inline]
    worker_thread+0x243/0x490 kernel/workqueue.c:3439
    kthread+0x14e/0x1a0 kernel/kthread.c:436
    ret_from_fork+0x23c/0x4b0 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

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/03/09 23:37 upstream 1f318b96cc84 176bead5 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in __vsock_create
2026/02/15 16:00 upstream ca4ee40bf13d 1e62d198 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in __vsock_create
* Struck through repros no longer work on HEAD.