------------[ cut here ]------------ refcount_t: addition on 0; use-after-free. WARNING: CPU: 0 PID: 1085 at lib/refcount.c:25 refcount_warn_saturate+0x169/0x1e0 lib/refcount.c:25 Modules linked in: CPU: 0 PID: 1085 Comm: kworker/u4:4 Not tainted 5.18.0-rc5-next-20220506-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: krdsd rds_connect_worker RIP: 0010:refcount_warn_saturate+0x169/0x1e0 lib/refcount.c:25 Code: 09 31 ff 89 de e8 c7 6d 7f fd 84 db 0f 85 36 ff ff ff e8 da 69 7f fd 48 c7 c7 a0 a4 27 8a c6 05 c8 04 ab 09 01 e8 27 e1 33 05 <0f> 0b e9 17 ff ff ff e8 bb 69 7f fd 0f b6 1d ad 04 ab 09 31 ff 89 Code: 09 31 ff 89 de e8 c7 6d 7f fd 84 db 0f 85 36 ff ff ff e8 da 69 7f fd 48 c7 c7 a0 a4 27 8a c6 05 c8 04 ab 09 01 e8 27 e1 33 05 <0f> 0b e9 17 ff ff ff e8 bb 69 7f fd 0f b6 1d ad 04 ab 09 31 ff 89 RSP: 0018:ffffc90005417b80 EFLAGS: 00010286 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff88801d5f9d80 RSI: ffffffff8160bf78 RDI: fffff52000a82f62 RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff816054a9 R11: 0000000000000000 R12: ffff888076f2d280 R13: ffff888057516a00 R14: ffff888076f2d3cc R15: ffff888077b190f8 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2ecab691b8 CR3: 0000000022e8f000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __refcount_add include/linux/refcount.h:199 [inline] __refcount_inc include/linux/refcount.h:250 [inline] refcount_inc include/linux/refcount.h:267 [inline] get_net include/net/net_namespace.h:248 [inline] get_net_track include/net/net_namespace.h:334 [inline] rds_tcp_tune+0x5a0/0x5f0 net/rds/tcp.c:503 rds_tcp_conn_path_connect+0x489/0x880 net/rds/tcp_connect.c:127 rds_connect_worker+0x1a5/0x2c0 net/rds/threads.c:176 process_one_work+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298