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Could be the cause of our flaky xfb tests:

(gdb) r                                                                                                                                                                                                                                                                                     
Starting program: /usr/local/deqp/modules/gles3/deqp-gles3 --deqp-surface-type=pbuffer --deqp-gl-config-name=rgba8888d24s8ms0 --deqp-surface-width=256 --deqp-surface-height=256 -n dEQP-GLES3.functional.transform_feedback.random.\*                                                      
[Thread debugging using libthread_db enabled]                                                                                                                                                                                                                                               
Using host libthread_db library "/lib/libthread_db.so.1".
Writing test log into TestResults.qpa
dEQP Core unknown (0xcafebabe) starting..
  target implementation = 'Surfaceless'
[I] Pipe Info: (msm_pipe_new:239)
[I]  GPU-id:          630 (msm_pipe_new:240)
[I]  Chip-id:         0x06030002 (msm_pipe_new:241)
[I]  GMEM size:       0x00100000 (msm_pipe_new:242)
[I] Pipe Info: (msm_pipe_new:239)                                   
[I]  GPU-id:          630 (msm_pipe_new:240)                         
[I]  Chip-id:         0x06030002 (msm_pipe_new:241)                 
[I]  GMEM size:       0x00100000 (msm_pipe_new:242)                 
Test case 'dEQP-GLES3.functional.transform_feedback.random.separate.points.1'..
double free or corruption (fasttop)                                  
Program received signal SIGABRT, Aborted.                           
__libc_do_syscall () at ../sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:47
47      ../sysdeps/unix/sysv/linux/arm/libc-do-syscall.S: No such file or directory.
(gdb) bt                                                             
#0  __libc_do_syscall () at ../sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:47
#1  0xf7d2e18e in __libc_signal_restore_set (set=0xfffee1bc) at ../sysdeps/unix/sysv/linux/nptl-signals.h:80
#2  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:48
#3  0xf7d2ef12 in __GI_abort () at abort.c:79                       
#4  0xf7d596d2 in __libc_message (action=action@entry=do_abort, fmt=0xf7de8108 "%s\n") at ../sysdeps/posix/libc_fatal.c:181
#5  0xf7d5daee in malloc_printerr (str=<optimized out>) at malloc.c:5350
#6  0xf7d5e692 in _int_free (av=<optimized out>, p=0x100fbd8, have_lock=0) at malloc.c:4230
#7  0xf78e1b14 in unsafe_free (info=0x100fbe0) at ../src/util/ralloc.c:299
#8  0xf78e1af8 in unsafe_free (info=0xd399fc) at ../src/util/ralloc.c:292                                               
#9  0xf78e1af8 in unsafe_free (info=0x10284e8) at ../src/util/ralloc.c:292     
#10 0xf78e1af8 in unsafe_free (info=0x1038468) at ../src/util/ralloc.c:292
#11 0xf78e1a62 in ralloc_free (ptr=0x1038480) at ../src/util/ralloc.c:262                                               
#12 0xf74c0536 in ir3_context_free (ctx=0x1038480) at ../src/freedreno/ir3/ir3_context.c:126
#13 0xf74b5b64 in ir3_compile_shader_nir (compiler=0xbde258, so=0x100f850) at ../src/freedreno/ir3/ir3_compiler_nir.c:3318
#14 0xf74ad2ee in create_variant (shader=0x10303e8, key=0xfffee6cc, binning_pass=false) at ../src/freedreno/ir3/ir3_shader.c:196
#15 0xf74ad230 in shader_variant (shader=0x10303e8, key=0xfffee6cc, created=0xfffee6cb) at ../src/freedreno/ir3/ir3_shader.c:228
#16 0xf74ad18c in ir3_shader_get_variant (shader=0x10303e8, key=0xfffee6cc, binning_pass=false, created=0xfffee6cb) at ../src/freedreno/ir3/ir3_shader.c:243
#17 0xf748b942 in ir3_shader_variant (shader=0x10303e8, key=..., binning_pass=false, debug=0xc974d0) at ../src/gallium/drivers/freedreno/ir3/ir3_gallium.c:80
#18 0xf748b678 in ir3_cache_lookup (cache=0xc1a718, key=0xfffee85c, debug=0xc974d0) at ../src/gallium/drivers/freedreno/ir3/ir3_cache.c:98
#19 0xf74789aa in fd6_emit_get_prog (emit=0xfffee850) at ../src/gallium/drivers/freedreno/a6xx/fd6_emit.h:115
#20 0xf7478308 in fd6_draw_vbo (ctx=0xc92c60, info=0xfffeec40, index_offset=0) at ../src/gallium/drivers/freedreno/a6xx/fd6_draw.c:165
#21 0xf74928c8 in fd_draw_vbo (pctx=0xc92c60, info=0xfffeec40) at ../src/gallium/drivers/freedreno/freedreno_draw.c:286
#22 0xf741c830 in u_vbuf_draw_vbo (mgr=0xcfcfb0, info=0xfffeed14) at ../src/gallium/auxiliary/util/u_vbuf.c:1451
#23 0xf73e4e00 in cso_draw_vbo (cso=0xcfc258, info=0xfffeed14) at ../src/gallium/auxiliary/cso_cache/cso_context.c:1705                                                                       
#24 0xf76f7b42 in st_draw_vbo (ctx=0xca1068, prims=0xfffeedc0, nr_prims=1, ib=0x0, index_bounds_valid=1 '\001', min_index=0, max_index=0, tfb_vertcount=0x0, stream=0, indirect=0x0)
    at ../src/mesa/state_tracker/st_draw.c:268                           
#25 0xf764ee98 in _mesa_draw_arrays (ctx=0xca1068, mode=0, start=0, count=1, numInstances=1, baseInstance=0, drawID=0) at ../src/mesa/main/draw.c:374
#26 0xf764ece4 in _mesa_DrawArrays (mode=0, start=0, count=1) at ../src/mesa/main/draw.c:531
#27 0xf7cb05de in shared_dispatch_stub_310 (mode=0, first=0, count=1) at src/mapi/shared-glapi/glapi_mapi_tmp.h:19933                                                                                    
#28 0x0050a414 in _start ()