------------[ cut here ]------------ refcount_t: addition on 0; use-after-free. WARNING: CPU: 0 PID: 7861 at lib/refcount.c:25 refcount_warn_saturate+0x169/0x1e0 lib/refcount.c:25 Modules linked in: CPU: 0 PID: 7861 Comm: kworker/u4:15 Not tainted 5.18.0-rc5-syzkaller-01270-g8fc0b6992a06 #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 b7 46 81 fd 84 db 0f 85 36 ff ff ff e8 ca 42 81 fd 48 c7 c7 c0 f2 26 8a c6 05 95 2b ad 09 01 e8 ef 0a 33 05 <0f> 0b e9 17 ff ff ff e8 ab 42 81 fd 0f b6 1d 7a 2b ad 09 31 ff 89 RSP: 0018:ffffc90006747b80 EFLAGS: 00010286 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff888079a80000 RSI: ffffffff816013d8 RDI: fffff52000ce8f62 RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff815fbdae R11: 0000000000000000 R12: ffff88801deed280 R13: ffff88805ded9600 R14: ffff88801deed3cc R15: ffff888023d4e4f8 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f505676c058 CR3: 000000001c356000 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