[Qemu-devel] [Bug 1713408] Re: qemu crashes with "GLib-ERROR **: gmem.c" error when a negative value passed to "maxcpus"

["R.Nageswara Sastry" <nasastry@in.ibm.com>]

Sure will do the changes and update. Seems one of my colleague did it already (sent patch to devel list)
https://lists.nongnu.org/archive/html/qemu-devel/2017-08/msg05345.html
I will pass your review comments to her for modification.

Thanks for your review.

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https://bugs.launchpad.net/bugs/1713408

Title:
  qemu crashes with "GLib-ERROR **: gmem.c" error when a negative value
  passed to "maxcpus"

Status in QEMU:
  New

Bug description:
  # ppc64-softmmu/qemu-system-ppc64 --nographic -vga none -machine
  pseries,accel=kvm,kvm-type=HV -m size=20g -device virtio-blk-
  pci,drive=rootdisk -drive file=/home/nasastry/avocado-fvt-wrapper/data
  /avocado-
  vt/images/pegas-1.0-ppc64le.qcow2,if=none,cache=none,id=rootdisk,format=qcow2
  -monitor telnet:127.0.0.1:1234,server,nowait -net nic,model=virtio
  -net user -device nec-usb-xhci -smp 8,cores=1,threads=1,maxcpus=-12

  (process:12149): GLib-ERROR **: gmem.c:130: failed to allocate
  18446744073709550568 bytes

  From GDB:
  [New Thread 0x3fffb5aceb60 (LWP 12190)]

  (process:12184): GLib-ERROR **: gmem.c:130: failed to allocate
  18446744073709550568 bytes

  Program received signal SIGTRAP, Trace/breakpoint trap.
  0x00003fffb75e5408 in raise () from /lib64/libpthread.so.0
  Missing separate debuginfos, use: debuginfo-install glib2-2.50.3-3.el7.ppc64le glibc-2.17-196.el7.ppc64le gnutls-3.3.26-9.el7.ppc64le krb5-libs-1.15.1-8.el7.ppc64le libgcc-4.8.5-16.el7.ppc64le libstdc++-4.8.5-16.el7.ppc64le ncurses-libs-5.9-13.20130511.el7.ppc64le nss-3.28.4-8.el7.ppc64le nss-softokn-freebl-3.28.3-6.el7.ppc64le nss-util-3.28.4-3.el7.ppc64le openldap-2.4.44-5.el7.ppc64le openssl-libs-1.0.2k-8.el7.ppc64le p11-kit-0.23.5-3.el7.ppc64le
  (gdb) bt
  #0  0x00003fffb75e5408 in raise () from /lib64/libpthread.so.0
  #1  0x00003fffb796be9c in _g_log_abort () from /lib64/libglib-2.0.so.0
  #2  0x00003fffb796d4c4 in g_log_default_handler () from /lib64/libglib-2.0.so.0
  #3  0x00003fffb796d86c in g_logv () from /lib64/libglib-2.0.so.0
  #4  0x00003fffb796db00 in g_log () from /lib64/libglib-2.0.so.0
  #5  0x00003fffb796b694 in g_malloc0 () from /lib64/libglib-2.0.so.0
  #6  0x000000001018fa84 in spapr_possible_cpu_arch_ids (machine=0x11165660) at /home/nasastry/upstream/qemu/hw/ppc/spapr.c:3322
  #7  0x000000001018b444 in spapr_init_cpus (spapr=0x11165660) at /home/nasastry/upstream/qemu/hw/ppc/spapr.c:2096
  #8  0x000000001018bc6c in ppc_spapr_init (machine=0x11165660) at /home/nasastry/upstream/qemu/hw/ppc/spapr.c:2275
  #9  0x000000001041ca38 in machine_run_board_init (machine=0x11165660) at hw/core/machine.c:760
  #10 0x000000001037723c in main (argc=24, argv=0x3ffffffff108, envp=0x3ffffffff1d0) at vl.c:4633
  (gdb) i r
  r0             0xfa	250
  r1             0x3fffffffe450	70368744170576
  r2             0x3fffb7608100	70367525765376
  r3             0x0	0
  r4             0x2f98	12184
  r5             0x5	5
  r6             0x0	0
  r7             0x3fffa8000020	70367267782688
  r8             0x2f98	12184
  r9             0x0	0
  r10            0x0	0
  r11            0x0	0
  r12            0x0	0
  r13            0x3fffb64fccb0	70367507893424
  r14            0x0	0
  r15            0x0	0
  r16            0x0	0
  r17            0x0	0
  r18            0x1	1
  r19            0x0	0
  r20            0x3fffb796d3f0	70367529325552
  r21            0x0	0
  r22            0x20000000	536870912
  r23            0x1	1
  r24            0x3fffb7a61498	70367530325144
  r25            0x3fffb7a614e8	70367530325224
  r26            0x3fffb7a61488	70367530325128
  r27            0x3fffa80008c0	70367267784896
  r28            0x3fffb79cd2a8	70367529718440
  r29            0x3fffb79cd2a8	70367529718440
  r30            0xffffffffffffffff	18446744073709551615
  r31            0x1	1
  pc             0x3fffb75e5408	0x3fffb75e5408 <raise+56>
  msr            0x900000000000d033	10376293541461676083
  cr             0x42244842	1109674050
  lr             0x3fffb796be9c	0x3fffb796be9c <_g_log_abort+60>
  ctr            0x0	0
  xer            0x0	0
  orig_r3        0x2f98	12184
  trap           0xc00	3072

  Similar error observed on x86_64 and PPC64LE architectures.

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