------------[ cut here ]------------
refcount_t: addition on 0; use-after-free.
WARNING: CPU: 0 PID: 11524 at lib/refcount.c:25 refcount_warn_saturate+0x13d/0x1a0 lib/refcount.c:25
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 11524 Comm: kworker/u4:6 Not tainted 5.9.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: qrtr_ns_handler qrtr_ns_worker
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1d6/0x29e lib/dump_stack.c:118
 panic+0x2c0/0x800 kernel/panic.c:231
 __warn+0x227/0x250 kernel/panic.c:600
 report_bug+0x1b1/0x2e0 lib/bug.c:198
 handle_bug+0x42/0x80 arch/x86/kernel/traps.c:234
 exc_invalid_op+0x16/0x40 arch/x86/kernel/traps.c:254
 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:536
RIP: 0010:refcount_warn_saturate+0x13d/0x1a0 lib/refcount.c:25
Code: c7 63 9e 15 89 31 c0 e8 01 1e a6 fd 0f 0b eb a3 e8 68 7f d4 fd c6 05 93 73 ea 05 01 48 c7 c7 9a 9e 15 89 31 c0 e8 e3 1d a6 fd <0f> 0b eb 85 e8 4a 7f d4 fd c6 05 76 73 ea 05 01 48 c7 c7 c6 9e 15
RSP: 0018:ffffc90001c179c0 EFLAGS: 00010046
RAX: d353152ed0b38400 RBX: 0000000000000002 RCX: ffff88805d0a0040
RDX: 0000000000000000 RSI: 0000000080000001 RDI: 0000000000000000
RBP: 0000000000000002 R08: ffffffff815e3810 R09: ffffed1015d041c3
R10: ffffed1015d041c3 R11: 0000000000000000 R12: ffff88808a34f898
R13: 1ffff11012ed2e5e R14: 0000000000000282 R15: ffff88808a34f800
 refcount_add include/linux/refcount.h:206 [inline]
 refcount_inc include/linux/refcount.h:241 [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:388
 qrtr_send_resume_tx net/qrtr/qrtr.c:980 [inline]
 qrtr_recvmsg+0x429/0xa80 net/qrtr/qrtr.c:1043
 qrtr_ns_worker+0x176/0x45f0 net/qrtr/ns.c:624
 process_one_work+0x789/0xfc0 kernel/workqueue.c:2269
 worker_thread+0xaa4/0x1460 kernel/workqueue.c:2415
 kthread+0x37e/0x3a0 drivers/block/aoe/aoecmd.c:1234
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
Shutting down cpus with NMI
Kernel Offset: disabled
Rebooting in 86400 seconds..