diff options
Diffstat (limited to 'results/classifier/105/boot/2984')
| -rw-r--r-- | results/classifier/105/boot/2984 | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/results/classifier/105/boot/2984 b/results/classifier/105/boot/2984 new file mode 100644 index 000000000..87a7b8ccb --- /dev/null +++ b/results/classifier/105/boot/2984 @@ -0,0 +1,66 @@ +boot: 0.357 +mistranslation: 0.341 +device: 0.335 +instruction: 0.333 +vnc: 0.327 +semantic: 0.298 +network: 0.267 +other: 0.255 +graphic: 0.242 +KVM: 0.223 +socket: 0.207 +assembly: 0.182 + +CPU hotplug crashed the guest when using virt-type as qemu! +Description of problem: +Guest is getting crashing and getting into shutoff state when I am trying to hotplug much more cpus than present in the host! This is happening only when i give virt-type as qemu. +Additional information: +Tried reproducing while attaching gdb shows below backtrace which happened after hotplugging 249 CPUs in TCG mode: + +``` +Thread 261 "CPU 249/TCG" received signal SIGABRT, Aborted. +[Switching to Thread 0x7ff97c00ea20 (LWP 51567)] +0x00007fff84cac3e8 in __pthread_kill_implementation () from target:/lib64/glibc-hwcaps/power10/libc.so.6 +(gdb) bt +#0 0x00007fff84cac3e8 in __pthread_kill_implementation () from target:/lib64/glibc-hwcaps/power10/libc.so.6 +#1 0x00007fff84c46ba0 in raise () from target:/lib64/glibc-hwcaps/power10/libc.so.6 +#2 0x00007fff84c29354 in abort () from target:/lib64/glibc-hwcaps/power10/libc.so.6 +#3 0x00007fff850f1e30 in g_assertion_message () from target:/lib64/libglib-2.0.so.0 +#4 0x00007fff850f1ebc in g_assertion_message_expr () from target:/lib64/libglib-2.0.so.0 +#5 0x00000001376c6f00 in tcg_region_initial_alloc__locked (s=0x7fff7c000f30) at ../tcg/region.c:396 +#6 0x00000001376c6fa8 in tcg_region_initial_alloc (s=0x7fff7c000f30) at ../tcg/region.c:402 +#7 0x00000001376dae08 in tcg_register_thread () at ../tcg/tcg.c:1011 +#8 0x000000013768b7e4 in mttcg_cpu_thread_fn (arg=0x143e884f0) at ../accel/tcg/tcg-accel-ops-mttcg.c:77 +#9 0x0000000137bbb2d0 in qemu_thread_start (args=0x143b4aff0) at ../util/qemu-thread-posix.c:542 +#10 0x00007fff84ca9be0 in start_thread () from target:/lib64/glibc-hwcaps/power10/libc.so.6 +#11 0x00007fff84d4ef3c in __clone3 () from target:/lib64/glibc-hwcaps/power10/libc.so.6 +(gdb) +``` + +which points to below code: + +``` +/* + * Perform a context's first region allocation. + * This function does _not_ increment region.agg_size_full. + */ +static void tcg_region_initial_alloc__locked(TCGContext *s) +{ + bool err = tcg_region_alloc__locked(s); + g_assert(!err); +} +``` + +Here, tcg_region_alloc__locked returns true on failure when max region allocation is reached and therefore intentionally asserted as TCG can't proceed without it. + +``` +static bool tcg_region_alloc__locked(TCGContext *s) +{ + if (region.current == region.n) { + return true; + } + tcg_region_assign(s, region.current); + region.current++; + return false; +} +``` |