------------[ cut here ]------------
refcount_t: addition on 0; use-after-free.
WARNING: CPU: 1 PID: 206 at lib/refcount.c:25 refcount_warn_saturate+0x13d/0x1a0 lib/refcount.c:25
Modules linked in:
CPU: 1 PID: 206 Comm: kworker/u4:4 Not tainted 5.10.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: qrtr_ns_handler qrtr_ns_worker
RIP: 0010:refcount_warn_saturate+0x13d/0x1a0 lib/refcount.c:25
Code: c7 a0 47 0c 8a 31 c0 e8 31 a3 83 fd 0f 0b eb a3 e8 18 84 b3 fd c6 05 8d aa 39 09 01 48 c7 c7 40 48 0c 8a 31 c0 e8 13 a3 83 fd <0f> 0b eb 85 e8 fa 83 b3 fd c6 05 70 aa 39 09 01 48 c7 c7 a0 48 0c
RSP: 0018:ffffc900017cf9b8 EFLAGS: 00010046
RAX: 9502413499239800 RBX: 0000000000000002 RCX: ffff888011b93480
RDX: 0000000000000000 RSI: 0000000080000001 RDI: 0000000000000000
RBP: 0000000000000002 R08: ffffffff815d2a62 R09: ffffed10173a3ffc
R10: ffffed10173a3ffc R11: 0000000000000000 R12: ffff888018cf8898
R13: 1ffff1100508316e R14: 0000000000000282 R15: ffff888018cf8800
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2c722000 CR3: 0000000017dd4000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __refcount_add include/linux/refcount.h:201 [inline]
 __refcount_inc include/linux/refcount.h:250 [inline]
 refcount_inc include/linux/refcount.h:267 [inline]
 kref_get include/linux/kref.h:45 [inline]
 qrtr_node_acquire net/qrtr/qrtr.c:196 [inline]
 qrtr_node_lookup+0xc0/0xd0 net/qrtr/qrtr.c:389
 qrtr_send_resume_tx net/qrtr/qrtr.c:981 [inline]
 qrtr_recvmsg+0x429/0xa80 net/qrtr/qrtr.c:1044
 qrtr_ns_worker+0x164/0x5470 net/qrtr/ns.c:692
 process_one_work+0x789/0xfc0 kernel/workqueue.c:2272
 worker_thread+0xaa4/0x1460 kernel/workqueue.c:2418
 kthread+0x39a/0x3c0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296