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+Segfault in artist_vram_read
+
+Hello,
+Reproducer:
+
+cat << EOF | ./hppa-softmmu/qemu-system-hppa -m 64 -display none \
+-qtest stdio -accel qtest
+writew 0xf8118001 0x105a
+readq 0xf900f8ff
+EOF
+
+=================================================================
+==20118==ERROR: AddressSanitizer: SEGV on unknown address 0x7fc6fb847672 (pc 0x55ec9c0f6828 bp 0x7ffd91000230 sp 0x7ffd90ffffd0 T0)
+==20118==The signal is caused by a READ memory access.
+    #0 0x55ec9c0f6828 in artist_vram_read /hw/display/artist.c:1174:15
+    #1 0x55ec9b84a582 in memory_region_read_accessor /softmmu/memory.c:434:11
+    #2 0x55ec9b7d1adc in access_with_adjusted_size /softmmu/memory.c:539:18
+    #3 0x55ec9b7cd769 in memory_region_dispatch_read1 /softmmu/memory.c:1385:16
+    #4 0x55ec9b7cc855 in memory_region_dispatch_read /softmmu/memory.c:1414:9
+    #5 0x55ec9ae621de in flatview_read_continue /exec.c:3239:23
+    #6 0x55ec9ae64fb1 in flatview_read /exec.c:3279:12
+    #7 0x55ec9ae64af7 in address_space_read_full /exec.c:3292:18
+    #8 0x55ec9b87c990 in address_space_read /include/exec/memory.h:2429:18
+    #9 0x55ec9b87c990 in qtest_process_command /softmmu/qtest.c:485:13
+    #10 0x55ec9b870c08 in qtest_process_inbuf /softmmu/qtest.c:710:9
+    #11 0x55ec9b86f895 in qtest_read /softmmu/qtest.c:722:5
+    #12 0x55ec9dd2b2f3 in qemu_chr_be_write_impl /chardev/char.c:188:9
+    #13 0x55ec9dd2b477 in qemu_chr_be_write /chardev/char.c:200:9
+    #14 0x55ec9dd3f763 in fd_chr_read /chardev/char-fd.c:68:9
+    #15 0x55ec9de93b24 in qio_channel_fd_source_dispatch /io/channel-watch.c:84:12
+    #16 0x7fc7261ad897 in g_main_context_dispatch ()
+    #17 0x55ec9e28ba2b in glib_pollfds_poll /util/main-loop.c:217:9
+    #18 0x55ec9e28915b in os_host_main_loop_wait /util/main-loop.c:240:5
+    #19 0x55ec9e288af4 in main_loop_wait /util/main-loop.c:516:11
+    #20 0x55ec9b891d00 in qemu_main_loop /softmmu/vl.c:1676:9
+    #21 0x55ec9decb911 in main /softmmu/main.c:49:5
+
+The error occurs even with Message-Id: <email address hidden> applied (I collected the above trace with the patch-set applied)
+
+Thanks
+-Alex
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