This issue was fixed with the following upstream commit:
http://git.qemu.org/?p=qemu.git;a=commit;h=4b3a4f2d458ca5a7c6c16ac36a8d9ac22cc253d6
Shipped in QEMU 2.5.1 and 2.6.
** Changed in: qemu
Status: New => Fix Released
--
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1527322
Title:
segfault in thread-pool.c:246:5:
Status in QEMU:
Fix Released
Bug description:
Building qemu-2.5.0 with -fsanitize=undefined shows, e.g.:
markus@x4 linux % qemu-system-x86_64 -s -enable-kvm -net
nic,vlan=0,model=virtio -net user -fsdev
local,security_model=none,id=root,path=/ -device virtio-9p-pci,id=root,fsdev
=root,mount_tag=/dev/root -m 512 -smp 2 -kernel
/usr/src/linux/arch/x86/boot/bzImage -nographic -append "init=/bin/zsh
root=/dev/root console=ttyS0 kgdboc=ttyS0 rootflags=rw,
trans=virtio rootfstype=9p ip=dhcp earlyprintk=ttyS0"
/var/tmp/portage/app-emulation/qemu-2.5.0/work/qemu-2.5.0/exec.c:307:5:
runtime error: variable length array bound evaluates to non-positive value 0
/var/tmp/portage/app-emulation/qemu-2.5.0/work/qemu-2.5.0/hw/i386/kvm/apic.c:37:47:
runtime error: left shift of 15 by 28 places cannot be represented in type
'int'
/var/tmp/portage/app-emulation/qemu-2.5.0/work/qemu-2.5.0/include/qemu/rcu.h:85:21:
runtime error: member access within null pointer of type 'struct
rcu_reader_data'
/var/tmp/portage/app-emulation/qemu-2.5.0/work/qemu-2.5.0/include/qemu/rcu.h:101:5:
runtime error: member access within null pointer of type 'struct
rcu_reader_data'
/var/tmp/portage/app-emulation/qemu-2.5.0/work/qemu-2.5.0/include/qemu/rcu.h:102:8:
runtime error: member access within null pointer of type 'struct
rcu_reader_data'
...
ALSA device list:
No soundcards found.
/var/tmp/portage/app-emulation/qemu-2.5.0/work/qemu-2.5.0/thread-pool.c:246:5:
runtime error: member access within null pointer of type 'struct ThreadPool'
[1] 9295 segmentation fault qemu-system-x86_64 -s -enable-kvm -net
nic,vlan=0,model=virtio -net user
As you can see it segfaults when build with upcoming gcc-6, that is more
aggressive when it comes to undefined behavior.
The compiler just assumes that "this" can never be NULL and optimizes
accordingly.
To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1527322/+subscriptions
