syzbot ci has tested the following series [v1] vsock/virtio: fix memory leak in virtio_transport_recv_listen https://lore.kernel.org/all/[email protected] * [PATCH] vsock/virtio: fix memory leak in virtio_transport_recv_listen
and found the following issue: possible deadlock in virtio_transport_recv_listen Full report is available here: https://ci.syzbot.org/series/76f40e62-5a21-46d4-a636-10f0ec9c5040 *** possible deadlock in virtio_transport_recv_listen tree: net-next URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/netdev/net-next.git base: bfa3d89cc15c09f7d1581c834a5ed725189ec19f arch: amd64 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 config: https://ci.syzbot.org/builds/5a94a424-94b1-4b1e-8b06-74d59933368f/config syz repro: https://ci.syzbot.org/findings/a8224003-11b3-4232-a635-6755ad892149/syz_repro ============================================ WARNING: possible recursive locking detected syzkaller #0 Not tainted -------------------------------------------- kworker/0:3/5740 is trying to acquire lock: ffff88810efb62a0 (sk_lock-AF_VSOCK){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline] ffff88810efb62a0 (sk_lock-AF_VSOCK){+.+.}-{0:0}, at: virtio_transport_recv_listen+0x964/0x2120 net/vmw_vsock/virtio_transport_common.c:1577 but task is already holding lock: ffff88810efb62a0 (sk_lock-AF_VSOCK){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline] ffff88810efb62a0 (sk_lock-AF_VSOCK){+.+.}-{0:0}, at: virtio_transport_recv_pkt+0xa26/0x2800 net/vmw_vsock/virtio_transport_common.c:1668 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(sk_lock-AF_VSOCK); lock(sk_lock-AF_VSOCK); *** DEADLOCK *** May be due to missing lock nesting notation 4 locks held by kworker/0:3/5740: #0: ffff8881150d3540 ((wq_completion)vsock-loopback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3289 [inline] #0: ffff8881150d3540 ((wq_completion)vsock-loopback){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860 kernel/workqueue.c:3397 #1: ffffc90003fafc40 ((work_completion)(&vsock->pkt_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3290 [inline] #1: ffffc90003fafc40 ((work_completion)(&vsock->pkt_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860 kernel/workqueue.c:3397 #2: ffff88810efb62a0 (sk_lock-AF_VSOCK){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline] #2: ffff88810efb62a0 (sk_lock-AF_VSOCK){+.+.}-{0:0}, at: virtio_transport_recv_pkt+0xa26/0x2800 net/vmw_vsock/virtio_transport_common.c:1668 #3: ffff88810efb5120 (sk_lock-AF_VSOCK/1){+.+.}-{0:0}, at: virtio_transport_recv_listen+0x83f/0x2120 net/vmw_vsock/virtio_transport_common.c:1564 stack backtrace: CPU: 0 UID: 0 PID: 5740 Comm: kworker/0:3 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Workqueue: vsock-loopback vsock_loopback_work Call Trace: <TASK> dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_deadlock_bug+0x279/0x290 kernel/locking/lockdep.c:3041 check_deadlock kernel/locking/lockdep.c:3093 [inline] validate_chain kernel/locking/lockdep.c:3895 [inline] __lock_acquire+0x253f/0x2cf0 kernel/locking/lockdep.c:5237 lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 lock_sock_nested+0x41/0x100 net/core/sock.c:3790 lock_sock include/net/sock.h:1713 [inline] virtio_transport_recv_listen+0x964/0x2120 net/vmw_vsock/virtio_transport_common.c:1577 virtio_transport_recv_pkt+0x1570/0x2800 net/vmw_vsock/virtio_transport_common.c:1692 vsock_loopback_work+0x32c/0x3f0 net/vmw_vsock/vsock_loopback.c:142 process_one_work kernel/workqueue.c:3314 [inline] process_scheduled_works+0xb5d/0x1860 kernel/workqueue.c:3397 worker_thread+0xa53/0xfc0 kernel/workqueue.c:3478 kthread+0x389/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> *** If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: [email protected] --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at [email protected]. To test a patch for this bug, please reply with `#syz test` (should be on a separate line). The patch should be attached to the email. Note: arguments like custom git repos and branches are not supported.
