mirror of https://github.com/proxmox/mirror_qemu
trace: add sanity check
If trace backend is set to TRACE_NOP, trace_get_vcpu_event_count returns 0, cause bitmap_new call abort. The abort can be triggered as follows: $ ./configure --enable-trace-backend=nop --target-list=x86_64-softmmu $ gdb ./x86_64-softmmu/qemu-system-x86_64 -M q35,accel=kvm -m 1G (gdb) bt #0 0x00007ffff04e25f7 in raise () from /lib64/libc.so.6 #1 0x00007ffff04e3ce8 in abort () from /lib64/libc.so.6 #2 0x00005555559de905 in bitmap_new (nbits=<optimized out>) at /home/root/git/qemu2.git/include/qemu/bitmap.h:96 #3 cpu_common_initfn (obj=0x555556621d30) at qom/cpu.c:399 #4 0x0000555555a11869 in object_init_with_type (obj=0x555556621d30, ti=0x55555656bbb0) at qom/object.c:341 #5 0x0000555555a11869 in object_init_with_type (obj=0x555556621d30, ti=0x55555656bd30) at qom/object.c:341 #6 0x0000555555a11efc in object_initialize_with_type (data=data@entry=0x555556621d30, size=76560, type=type@entry=0x55555656bd30) at qom/object.c:376 #7 0x0000555555a12061 in object_new_with_type (type=0x55555656bd30) at qom/object.c:484 #8 0x0000555555a121c5 in object_new (typename=typename@entry=0x555556550340 "qemu64-x86_64-cpu") at qom/object.c:494 #9 0x00005555557f6e3d in pc_new_cpu (typename=typename@entry=0x555556550340 "qemu64-x86_64-cpu", apic_id=0, errp=errp@entry=0x5555565391b0 <error_fatal>) at /home/root/git/qemu2.git/hw/i386/pc.c:1101 #10 0x00005555557fa33e in pc_cpus_init (pcms=pcms@entry=0x5555565f9690) at /home/root/git/qemu2.git/hw/i386/pc.c:1184 #11 0x00005555557fe0f6 in pc_q35_init (machine=0x5555565f9690) at /home/root/git/qemu2.git/hw/i386/pc_q35.c:121 #12 0x000055555574fbad in main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at vl.c:4562 Signed-off-by: Anthony Xu <anthony.xu@intel.com> Message-id: 1494369432-15418-1-git-send-email-anthony.xu@intel.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>master
parent
ecc1f5adee
commit
5651743c90
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@ -382,6 +382,7 @@ static void cpu_common_unrealizefn(DeviceState *dev, Error **errp)
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static void cpu_common_initfn(Object *obj)
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static void cpu_common_initfn(Object *obj)
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{
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{
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uint32_t count;
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CPUState *cpu = CPU(obj);
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CPUState *cpu = CPU(obj);
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CPUClass *cc = CPU_GET_CLASS(obj);
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CPUClass *cc = CPU_GET_CLASS(obj);
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@ -396,7 +397,10 @@ static void cpu_common_initfn(Object *obj)
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QTAILQ_INIT(&cpu->breakpoints);
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QTAILQ_INIT(&cpu->breakpoints);
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QTAILQ_INIT(&cpu->watchpoints);
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QTAILQ_INIT(&cpu->watchpoints);
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cpu->trace_dstate = bitmap_new(trace_get_vcpu_event_count());
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count = trace_get_vcpu_event_count();
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if (count) {
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cpu->trace_dstate = bitmap_new(count);
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}
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cpu_exec_initfn(cpu);
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cpu_exec_initfn(cpu);
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}
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}
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