W dniu 29.08.2014 o 01:13, Alex Xu pisze: > On 28/08/14 05:02 PM, Sven Vermeulen wrote: >> On Wed, Aug 27, 2014 at 05:34:20PM +0100, André Aparício wrote: >>> I encountered the same problem with qemu/kvm but can't even login, I >>> get random segfaults and even failed malloc assertions >>> in /sbin/init, /sbin/rc or /bin/login (never past this). >>> >>> But it works fine with CONFIG_PAX_MEMORY_UDEREF disabled. >> >> I am not able to reproduce this :-( >> >> Host and guest are both on 3.15.5-hardened-r2 and both have UDEREF enabled. >> >> I tried emerging boost on the guest as recommended in another post but this >> didn't fail. >> >> Wkr, >> Sven Vermeulen >> > > My VM has 12 CPUs but I use MAKEOPTS=-j3. Maybe this affects > reproducibility. > > My host is of unknown kernel, but I'm pretty sure it's not Gentoo, let > alone Hardened. > > Also, I am using <cpu mode="host-passthrough"/> in libvirt (equivalent > to -cpu host in qemu opts), so PAX detects PCID and enables strong > UDEREF. I will try with pax_weakuderef as soon as I get a chance to > reboot the VM.
Fabulous "me too", I've got <cpu mode='host-model'> and guest have PCID available: dmesg |grep PCID [ 0.020000] PAX: PCID detected [ 0.020000] PAX: PCID detected [ 0.020000] PAX: PCID detected Snip from cpuinfo of guest: processor : 2 vendor_id : GenuineIntel cpu family : 6 model : 42 model name : Intel Xeon E312xx (Sandy Bridge) stepping : 1 microcode : 0x1 cpu MHz : 3292.514 cache size : 4096 KB physical id : 2 siblings : 1 core id : 0 cpu cores : 1 apicid : 2 initial apicid : 2 fpu : yes fpu_exception : yes cpuid level : 13 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss syscall nx rdtscp lm constant_tsc arch_perfmon rep_good nopl eagerfpu pni pclmulqdq ssse3 cx16 pcid sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm xsaveopt fsgsbase smep erms bogomips : 6585.02 clflush size : 64 cache_alignment : 64 address sizes : 40 bits physical, 48 bits virtual power management:
