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authorChristian Krinitsin <mail@krinitsin.com>2025-07-03 07:27:52 +0000
committerChristian Krinitsin <mail@krinitsin.com>2025-07-03 07:27:52 +0000
commitd0c85e36e4de67af628d54e9ab577cc3fad7796a (patch)
treef8f784b0f04343b90516a338d6df81df3a85dfa2 /results/classifier/gemma3:12b/performance/1888714
parent7f4364274750eb8cb39a3e7493132fca1c01232e (diff)
downloadqemu-analysis-d0c85e36e4de67af628d54e9ab577cc3fad7796a.tar.gz
qemu-analysis-d0c85e36e4de67af628d54e9ab577cc3fad7796a.zip
add deepseek and gemma results
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+
+Memory Leak in hpet_timer results in unusable machine
+
+Fair warning: this might be specific to QTest (specifically its clock_step) command. This reproducer only works with -accel qtest. Build with --enable-sanitizers to exit once we hit 1G RSS.
+
+export ASAN_OPTIONS=hard_rss_limit_mb=1000 
+cat << EOF | ./i386-softmmu/qemu-system-i386 -nographic \
+-nodefaults -qtest stdio -accel qtest
+writeq 0xfed0000e 0x15151515151515f1
+clock_step
+clock_step
+clock_step
+clock_step
+writeq 0xfed00100 0x5e90c5be00ff5e9e
+writeq 0xfed00109 0xffffe0ff5cfec0ff
+clock_step
+EOF
+
+On my machine it takes around 10 seconds to reach the RSS limit.
+
+Unfortunately, I can't find a way to tell ASAN to log each malloc to figure out whats going on, but running the original fuzzing test case with the libfuzzer -trace_malloc=2 flag, I found that the allocations happen here:
+
+MALLOC[130968] 0x60300069ac90 32
+    #0 0x55fa3f615851 in __sanitizer_print_stack_trace (/home/alxndr/Development/qemu/build/i386-softmmu/qemu-fuzz-i386+0x2683851)
+    #1 0x55fa3f55fe88 in fuzzer::PrintStackTrace() (/home/alxndr/Development/qemu/build/i386-softmmu/qemu-fuzz-i386+0x25cde88)
+    #2 0x55fa3f5447d6 in fuzzer::MallocHook(void const volatile*, unsigned long) (/home/alxndr/Development/qemu/build/i386-softmmu/qemu-fuzz-i386+0x25b27d6)
+    #3 0x55fa3f61bbb7 in __sanitizer::RunMallocHooks(void const*, unsigned long) (/home/alxndr/Development/qemu/build/i386-softmmu/qemu-fuzz-i386+0x2689bb7)
+    #4 0x55fa3f596d75 in __asan::Allocator::Allocate(unsigned long, unsigned long, __sanitizer::BufferedStackTrace*, __asan::AllocType, bool) (/home/alxndr/Development/qemu/build/i386-softmmu/qemu-fuzz-i386+0x2604d75)
+    #5 0x55fa3f596f7a in __asan::asan_calloc(unsigned long, unsigned long, __sanitizer::BufferedStackTrace*) (/home/alxndr/Development/qemu/build/i386-softmmu/qemu-fuzz-i386+0x2604f7a)
+    #6 0x55fa3f60d173 in calloc (/home/alxndr/Development/qemu/build/i386-softmmu/qemu-fuzz-i386+0x267b173)
+    #7 0x7fb300737548 in g_malloc0 (/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x54548)
+    #8 0x55fa40157689 in async_run_on_cpu /home/alxndr/Development/qemu/cpus-common.c:163:10
+    #9 0x55fa409fab83 in hpet_timer /home/alxndr/Development/qemu/hw/timer/hpet.c:376:9
+    #10 0x55fa416a5751 in timerlist_run_timers /home/alxndr/Development/qemu/util/qemu-timer.c:572:9
+    #11 0x55fa3fcfdac4 in qtest_clock_warp /home/alxndr/Development/qemu/softmmu/cpus.c:507:9
+    #12 0x55fa3fd65c35 in qtest_process_command /home/alxndr/Development/qemu/softmmu/qtest.c:665:9
+    #13 0x55fa3fd5e128 in qtest_process_inbuf /home/alxndr/Development/qemu/softmmu/qtest.c:710:9
+    #14 0x55fa3fd5de67 in qtest_server_inproc_recv /home/alxndr/Development/qemu/softmmu/qtest.c:817:9
+    #15 0x55fa4142b64b in qtest_sendf /home/alxndr/Development/qemu/tests/qtest/libqtest.c:424:5
+    #16 0x55fa4142c482 in qtest_clock_step_next /home/alxndr/Development/qemu/tests/qtest/libqtest.c:864:5
+    #17 0x55fa414b12d1 in general_fuzz /home/alxndr/Development/qemu/tests/qtest/fuzz/general_fuzz.c:581:17
+
+It doesn't look like we ever exit out of the loop in timerlist_run_timers, ie timer_list->active_timers is always True.
+
+
+Info From GDB:
+#0  0x0000555558070d31 in address_space_stl_internal (as=0x55555f0e8f20 <address_space_memory>, addr=0x0, val=0x0, attrs=..., result=0x0, endian=DEVICE_LITTLE_ENDIAN) at /home/alxndr/Development/qemu/memory_ldst.inc.c:323
+#1  0x0000555558071339 in address_space_stl_le (as=0x55555f0e8f20 <address_space_memory>, addr=0x0, val=0x0, attrs=..., result=0x0) at /home/alxndr/Development/qemu/memory_ldst.inc.c:357
+#2  0x000055555a6a6f95 in update_irq (timer=0x61f0000005b8, set=0x1) at /home/alxndr/Development/qemu/hw/timer/hpet.c:210
+#3  0x000055555a6ae55f in hpet_timer (opaque=0x61f0000005b8) at /home/alxndr/Development/qemu/hw/timer/hpet.c:386
+#4  0x000055555c03d178 in timerlist_run_timers (timer_list=0x60b0000528f0) at /home/alxndr/Development/qemu/util/qemu-timer.c:572
+#5  0x000055555c03d6b5 in qemu_clock_run_timers (type=QEMU_CLOCK_VIRTUAL) at /home/alxndr/Development/qemu/util/qemu-timer.c:586
+#6  0x0000555558c3d0c4 in qtest_clock_warp (dest=0x3461864) at /home/alxndr/Development/qemu/softmmu/cpus.c:507
+
+
+-Alex
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