** Tags added: trusty -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1319100
Title: qemu-arm-static bug in signal handling avoids using mono Status in QEMU: New Status in qemu-kvm package in Ubuntu: New Status in qemu-kvm package in Debian: Unknown Bug description: Note, this bug is already reported to debian, but it seems to also affect the upstream code. https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=748043 running mono in a chroot environment with qemu-user-static is not posible because at least one signal used during termination of mono is routed to the host. This can be reproduced by: debootstrap --include=mono-runtime --foreign --arch=armel "wheezy" "mono-test" "http://ftp.de.debian.org//debian"; cp /usr/bin/qemu-arm-static mono-test/usr/bin mount -t proc none mono-test/proc mount -o bind /dev mono-test/dev mount -o bind /sys mono-test/sys chroot mono-test ../debootstrap/debootstrap --second-stage exit mount -t proc none mono-test/proc mount -o bind /sys mono-test/sys chroot mono-test QEMU_STRACE=1 /usr/bin/mono /usr/lib/mono/4.0/gacutil.exe This will block on a futex: --8<-- 18663 sched_yield(0,0,2582980,0,0,2582928) = 0 18663 clock_gettime(1,-150996384,2,1,2585016,2585600) = 0 18663 tgkill(18663,18664,30,18664,30,-161951744) = 0 18663 futex(0x00293774,FUTEX_PRIVATE_FLAG|FUTEX_WAIT,0,NULL,NULL,0) --8<-- If you use mono within strace on a native x86 box you can see, that signals between threads are used during termination: strace -f -o log.txt /usr/bin/mono /usr/lib/mono/4.0/gacutil.exe --8<-- 14075 sched_yield() = 0 14075 tgkill(14075, 14083, SIGPWR) = 0 14075 futex(0x983f00, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...> 14083 <... futex resumed> ) = ? ERESTARTSYS (To be restarted) 14083 --- SIGPWR (Power failure) @ 0 (0) --- 14083 futex(0x983f00, FUTEX_WAKE_PRIVATE, 1) = 1 14075 <... futex resumed> ) = 0 14083 rt_sigsuspend(~[INT QUIT ABRT TERM XCPU RTMIN RT_1] <unfinished ...> 14075 futex(0x94d9a4, FUTEX_CMP_REQUEUE_PRIVATE, 1, 2147483647, 0x94da20, 24) = 3 14078 <... futex resumed> ) = 0 14078 futex(0x94da20, FUTEX_WAKE_PRIVATE, 1) = 1 14077 <... futex resumed> ) = 0 14075 futex(0x94d9a4, FUTEX_CMP_REQUEUE_PRIVATE, 1, 2147483647, 0x94da20, 26 <unfinished ...> --8<-- This also blocks the installation of libnunit2.6-cil within a armel chroot, because it uses mono in its postinst script. E.g. (/usr/bin/mono /usr/share/mono/MonoGetAssemblyName.exe /usr/lib/cli/nunit.core-2.6/nunit.core.dll) Obviously the same as described in: http://lists.opensuse.org/opensuse-arm/2011-12/msg00000.html is happening here. There is an openSuSE patch against qemu: https://build.opensuse.org/package/view_file/Virtualization:Qemu/qemu/0002-XXX-work-around-SA_RESTART-race-wit.patch?expand=1 This patch also applies against qemu from backports-wheezy and resolves this issue. As it seems, that this issue is not Debian specific i will also report it to the qemu project and reference this bug report. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1319100/+subscriptions
