Description of problem: qemu-kvm --smp cpus=255 Version-Release number of selected component: qemu-system-x86-1.6.1-3.fc20 Additional info: reporter: libreport-2.2.0 backtrace_rating: 4 cmdline: /usr/bin/qemu-system-x86_64 -machine accel=kvm --smp cpus=44 crash_function: error_exit executable: /usr/bin/qemu-system-x86_64 kernel: 3.13.6-200.fc20.x86_64 runlevel: N 5 type: CCpp uid: 20787 Truncated backtrace: Thread no. 1 (10 frames) #2 error_exit at util/qemu-thread-posix.c:28 #3 qemu_thread_create at util/qemu-thread-posix.c:299 #4 qemu_kvm_start_vcpu at /usr/src/debug/qemu-1.6.1/cpus.c:1064 #5 qemu_init_vcpu at /usr/src/debug/qemu-1.6.1/cpus.c:1089 #6 x86_cpu_realizefn at /usr/src/debug/qemu-1.6.1/target-i386/cpu.c:2399 #7 device_set_realized at hw/core/qdev.c:720 #8 property_set_bool at qom/object.c:1300 #9 object_property_set_qobject at qom/qom-qobject.c:24 #10 object_property_set_bool at qom/object.c:851 #11 pc_new_cpu at /usr/src/debug/qemu-1.6.1/hw/i386/pc.c:922
Created attachment 877168 [details] File: backtrace
Created attachment 877169 [details] File: cgroup
Created attachment 877170 [details] File: core_backtrace
Created attachment 877171 [details] File: dso_list
Created attachment 877172 [details] File: environ
Created attachment 877173 [details] File: limits
Created attachment 877174 [details] File: maps
Created attachment 877175 [details] File: open_fds
Created attachment 877176 [details] File: proc_pid_status
Created attachment 877177 [details] File: var_log_messages
qemu is aborting because pthread_create failed... was printed in stderr? My guess is this is some resource exhaustion, like hitting a thread limit given --smp cpus=44
I'm able to reproduce this with: $ qemu-kvm --smp cpus=255 qemu: qemu_thread_create: Resource temporarily unavailable Aborted (core dumped) So.. maybe little bit error handling will be good.
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F22 now has: $ qemu-kvm -smp cpus=255 Warning: Number of SMP cpus requested (255) exceeds the recommended cpus supported by KVM (160) Warning: Number of hotpluggable cpus requested (255) exceeds the recommended cpus supported by KVM (160)