Memory leak after upgrading to mesa 21.3 from 21.2

Hello users,

Since updating to the latest mesa (currently 21.3.3) I get a leak when 
calling eglSwapBuffers.

My project is a wayland egl window which renders textures using a simple 
shader.

Below is the valgrind output.

RefreshWindow() basically contains eglSwapBuffers and 
wl_display_dispatch_pending

I've tried to create a small example to show this behaviour buts its 
trickier to weed out the code than I thought and so I hoped someone may 
have a suggestion of something I might be doing wrong from the call stack.

28,448 bytes in 889 blocks are definitely lost in loss record 22,700 of 
22,725 ==26865== at 0x55FC7B5: malloc (vg_replace_malloc.c:380) 
==26865== by 0x27E29066: update_bo_syncobjs (iris_batch.c:677) ==26865== 
by 0x27E29066: update_batch_syncobjs (iris_batch.c:755) ==26865== by 
0x27E29066: _iris_batch_flush (iris_batch.c:888) ==26865== by 
0x27E24C5B: iris_flush_resource (iris_resource.c:1393) ==26865== by 
0x27D80432: tc_call_flush_resource (u_threaded_context.c:3680) ==26865== 
by 0x27D7EEE1: tc_batch_execute (u_threaded_context.c:213) ==26865== by 
0x27D7FB8A: _tc_sync.constprop.0 (u_threaded_context.c:364) ==26865== by 
0x27D85747: tc_flush (u_threaded_context.c:2916) ==26865== by 
0x2787CC24: st_context_flush (st_manager.c:676) ==26865== by 0x27825F20: 
dri_flush (dri_drawable.c:522) ==26865== by 0x27612196: ??? ==26865== by 
0x27607A7D: ??? ==26865== by 0x275FB005: ??? ==26865== by 0xA77060: 
RefreshWindow() (WaylandEGL.cpp:165)

Thanks,

Richard