I just ran into the same bug (Ubuntu 16.04.4 LTS, fully updated at time
of the comment).
I've played with cmd arguments a little and it seems that the bug is
triggered at some length of the vnc socket path.
This is running okay:
$ qemu-system-x86_64 -enable-kvm -vnc unix:./service/vnc-sock
Also okay:
$ qemu-system-x86_64 -enable-kvm -vnc unix:../test-vm/service/vnc-sock
But this fails:
$ qemu-system-x86_64 -enable-kvm -vnc
unix:../test-vm/../test-vm/service/vnc-sock
*** Error in `qemu-system-x86_64': free(): invalid pointer: 0x00007f1cfc939b78
***
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(+0x777e5)[0x7f1cfc5ec7e5]
/lib/x86_64-linux-gnu/libc.so.6(+0x8037a)[0x7f1cfc5f537a]
/lib/x86_64-linux-gnu/libc.so.6(cfree+0x4c)[0x7f1cfc5f953c]
qemu-system-x86_64(+0x4b228d)[0x55fcafa3a28d]
qemu-system-x86_64(visit_type_VncServerInfo+0xa2)[0x55fcafa4c2c2]
qemu-system-x86_64(qapi_free_VncServerInfo+0x30)[0x55fcafa39890]
qemu-system-x86_64(+0x44184a)[0x55fcaf9c984a]
qemu-system-x86_64(+0x446953)[0x55fcaf9ce953]
qemu-system-x86_64(+0x446b35)[0x55fcaf9ceb35]
qemu-system-x86_64(aio_dispatch+0x68)[0x55fcaf9f0988]
qemu-system-x86_64(+0x45bc1e)[0x55fcaf9e3c1e]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_main_context_dispatch+0x2a7)[0x7f1cfd2cd197]
qemu-system-x86_64(main_loop_wait+0x18b)[0x55fcaf9ef28b]
qemu-system-x86_64(main+0x17b4)[0x55fcaf769714]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f1cfc595830]
qemu-system-x86_64(_start+0x29)[0x55fcaf76eda9]
Versions:
ii ipxe-qemu 1.0.0+git-20150424.a25a16d-1ubuntu1.2
all PXE boot firmware - ROM images for qemu
ii qemu-block-extra:amd64 1:2.5+dfsg-5ubuntu10.25
amd64 extra block backend modules for qemu-system and qemu-utils
ii qemu-kvm 1:2.5+dfsg-5ubuntu10.25
amd64 QEMU Full virtualization
ii qemu-system-common 1:2.5+dfsg-5ubuntu10.25
amd64 QEMU full system emulation binaries (common files)
ii qemu-system-x86 1:2.5+dfsg-5ubuntu10.25
amd64 QEMU full system emulation binaries (x86)
ii qemu-utils 1:2.5+dfsg-5ubuntu10.25
amd64 QEMU utilities
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https://bugs.launchpad.net/bugs/1705743
Title:
qemu-system-x86 crashes when VNC connection is established
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