Re: [Qemu-devel] Re: kvm crashes with spice while loading qxl
On 2011-03-01 13:58, Alon Levy wrote: On Sun, Feb 27, 2011 at 08:11:26PM +0100, Jan Kiszka wrote: On 2011-02-27 20:03, Alon Levy wrote: On Sat, Feb 26, 2011 at 01:29:01PM +0100, Jan Kiszka wrote: On 2011-02-26 12:43, xming wrote: When trying to start X (and it loads qxl driver) the kvm process just crashes. This is fixed by Gerd's attached patch (taken from rhel repository, don't know why it wasn't pushed to qemu-kvm upstream). I'll send it to kvm list as well (separate email). Patch looks OK on first glance, but the changelog is misleading: This was broken for _both_ trees, but upstream didn't detect the bug. So I didn't test with qemu not having this patch, but according to the discussion in the launchpad bug the problem only happens with qemu-kvm. This doesn't rule out it being a bug, perhaps it is just triggered much less frequently I guess. Again: qemu-kvm has the instrumentation to detect the bug, qemu is lacking this, but both trees will break subtly if cpu_current_env is not properly restored. Jan signature.asc Description: OpenPGP digital signature
Re: [Qemu-devel] Re: kvm crashes with spice while loading qxl
On Wed, Mar 02, 2011 at 09:22:35AM +0100, Jan Kiszka wrote: On 2011-03-01 13:58, Alon Levy wrote: On Sun, Feb 27, 2011 at 08:11:26PM +0100, Jan Kiszka wrote: On 2011-02-27 20:03, Alon Levy wrote: On Sat, Feb 26, 2011 at 01:29:01PM +0100, Jan Kiszka wrote: On 2011-02-26 12:43, xming wrote: When trying to start X (and it loads qxl driver) the kvm process just crashes. This is fixed by Gerd's attached patch (taken from rhel repository, don't know why it wasn't pushed to qemu-kvm upstream). I'll send it to kvm list as well (separate email). Patch looks OK on first glance, but the changelog is misleading: This was broken for _both_ trees, but upstream didn't detect the bug. So I didn't test with qemu not having this patch, but according to the discussion in the launchpad bug the problem only happens with qemu-kvm. This doesn't rule out it being a bug, perhaps it is just triggered much less frequently I guess. Again: qemu-kvm has the instrumentation to detect the bug, qemu is lacking this, but both trees will break subtly if cpu_current_env is not properly restored. ok, so what do you want to be done further before this patch is applied? Jan -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [Qemu-devel] Re: kvm crashes with spice while loading qxl
On 2011-03-02 11:56, Alon Levy wrote: On Wed, Mar 02, 2011 at 09:22:35AM +0100, Jan Kiszka wrote: On 2011-03-01 13:58, Alon Levy wrote: On Sun, Feb 27, 2011 at 08:11:26PM +0100, Jan Kiszka wrote: On 2011-02-27 20:03, Alon Levy wrote: On Sat, Feb 26, 2011 at 01:29:01PM +0100, Jan Kiszka wrote: On 2011-02-26 12:43, xming wrote: When trying to start X (and it loads qxl driver) the kvm process just crashes. This is fixed by Gerd's attached patch (taken from rhel repository, don't know why it wasn't pushed to qemu-kvm upstream). I'll send it to kvm list as well (separate email). Patch looks OK on first glance, but the changelog is misleading: This was broken for _both_ trees, but upstream didn't detect the bug. So I didn't test with qemu not having this patch, but according to the discussion in the launchpad bug the problem only happens with qemu-kvm. This doesn't rule out it being a bug, perhaps it is just triggered much less frequently I guess. Again: qemu-kvm has the instrumentation to detect the bug, qemu is lacking this, but both trees will break subtly if cpu_current_env is not properly restored. ok, so what do you want to be done further before this patch is applied? The patch posted to qemu-devel just requires a changelog that correctly reflects what it addresses (and where). Jan signature.asc Description: OpenPGP digital signature
Re: [Qemu-devel] Re: kvm crashes with spice while loading qxl
On Wed, Mar 02, 2011 at 12:34:24PM +0100, Jan Kiszka wrote: On 2011-03-02 11:56, Alon Levy wrote: On Wed, Mar 02, 2011 at 09:22:35AM +0100, Jan Kiszka wrote: On 2011-03-01 13:58, Alon Levy wrote: On Sun, Feb 27, 2011 at 08:11:26PM +0100, Jan Kiszka wrote: On 2011-02-27 20:03, Alon Levy wrote: On Sat, Feb 26, 2011 at 01:29:01PM +0100, Jan Kiszka wrote: On 2011-02-26 12:43, xming wrote: When trying to start X (and it loads qxl driver) the kvm process just crashes. This is fixed by Gerd's attached patch (taken from rhel repository, don't know why it wasn't pushed to qemu-kvm upstream). I'll send it to kvm list as well (separate email). Patch looks OK on first glance, but the changelog is misleading: This was broken for _both_ trees, but upstream didn't detect the bug. So I didn't test with qemu not having this patch, but according to the discussion in the launchpad bug the problem only happens with qemu-kvm. This doesn't rule out it being a bug, perhaps it is just triggered much less frequently I guess. Again: qemu-kvm has the instrumentation to detect the bug, qemu is lacking this, but both trees will break subtly if cpu_current_env is not properly restored. ok, so what do you want to be done further before this patch is applied? The patch posted to qemu-devel just requires a changelog that correctly reflects what it addresses (and where). Just sent, Alon Jan -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [Qemu-devel] Re: kvm crashes with spice while loading qxl
On Sun, Feb 27, 2011 at 08:11:26PM +0100, Jan Kiszka wrote: On 2011-02-27 20:03, Alon Levy wrote: On Sat, Feb 26, 2011 at 01:29:01PM +0100, Jan Kiszka wrote: On 2011-02-26 12:43, xming wrote: When trying to start X (and it loads qxl driver) the kvm process just crashes. This is fixed by Gerd's attached patch (taken from rhel repository, don't know why it wasn't pushed to qemu-kvm upstream). I'll send it to kvm list as well (separate email). Patch looks OK on first glance, but the changelog is misleading: This was broken for _both_ trees, but upstream didn't detect the bug. So I didn't test with qemu not having this patch, but according to the discussion in the launchpad bug the problem only happens with qemu-kvm. This doesn't rule out it being a bug, perhaps it is just triggered much less frequently I guess. My concerns regarding other side effects of juggling with global mutex in spice code remain. Jan -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [Qemu-devel] Re: kvm crashes with spice while loading qxl
On Sun, Feb 27, 2011 at 8:03 PM, Alon Levy al...@redhat.com wrote: On Sat, Feb 26, 2011 at 01:29:01PM +0100, Jan Kiszka wrote: On 2011-02-26 12:43, xming wrote: When trying to start X (and it loads qxl driver) the kvm process just crashes. This is fixed by Gerd's attached patch (taken from rhel repository, don't know why it wasn't pushed to qemu-kvm upstream). I'll send it to kvm list as well (separate email). I can confirm that this patch fixes the issue, thanks a lot cheers -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [Qemu-devel] Re: kvm crashes with spice while loading qxl
On Sunday 27 February 2011 13:03:14 Alon Levy wrote: On Sat, Feb 26, 2011 at 01:29:01PM +0100, Jan Kiszka wrote: On 2011-02-26 12:43, xming wrote: When trying to start X (and it loads qxl driver) the kvm process just crashes. This is fixed by Gerd's attached patch (taken from rhel repository, don't know why it wasn't pushed to qemu-kvm upstream). I'll send it to kvm list as well (separate email). This patch also fixed https://bugs.launchpad.net/bugs/723871 I created the bug report on launchpad, but I suppose it should be left open until the patch hits qemu-kvm? -Rick -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [Qemu-devel] Re: kvm crashes with spice while loading qxl
On Sat, Feb 26, 2011 at 01:29:01PM +0100, Jan Kiszka wrote: On 2011-02-26 12:43, xming wrote: When trying to start X (and it loads qxl driver) the kvm process just crashes. This is fixed by Gerd's attached patch (taken from rhel repository, don't know why it wasn't pushed to qemu-kvm upstream). I'll send it to kvm list as well (separate email). qemu-kvm 0.14 startup line /usr/bin/kvm -name spaceball,process=spaceball -m 1024 -kernel /boot/bzImage-2.6.37.2-guest -append root=/dev/vda ro -smp 1 -netdev type=tap,id=spaceball0,script=kvm-ifup-brloc,vhost=on -device virtio-net-pci,netdev=spaceball0,mac=00:16:3e:00:08:01 -drive file=/dev/volume01/G-spaceball,if=virtio -vga qxl -spice port=5957,disable-ticketing -monitor telnet:192.168.0.254:10007,server,nowait,nodelay -pidfile /var/run/kvm/spaceball.pid host is running vanilla 2.6.37.1 on amd64. Here is the bt # gdb /usr/bin/qemu-system-x86_64 GNU gdb (Gentoo 7.2 p1) 7.2 Copyright (C) 2010 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later http://gnu.org/licenses/gpl.html This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type show copying and show warranty for details. This GDB was configured as x86_64-pc-linux-gnu. For bug reporting instructions, please see: http://bugs.gentoo.org/... Reading symbols from /usr/bin/qemu-system-x86_64...done. (gdb) set args -name spaceball,process=spaceball -m 1024 -kernel /boot/bzImage-2.6.37.2-guest -append root=/dev/vda ro -smp 1 -netdev type=tap,id=spaceball0,script=kvm-ifup-brloc,vhost=on -device virtio-net-pci,netdev=spaceball0,mac=00:16:3e:00:08:01 -drive file=/dev/volume01/G-spaceball,if=virtio -vga qxl -spice port=5957,disable-ticketing -monitor telnet:192.168.0.254:10007,server,nowait,nodelay -pidfile /var/run/kvm/spaceball.pid (gdb) run Starting program: /usr/bin/qemu-system-x86_64 -name spaceball,process=spaceball -m 1024 -kernel /boot/bzImage-2.6.37.2-guest -append root=/dev/vda ro -smp 1 -netdev type=tap,id=spaceball0,script=kvm-ifup-brloc,vhost=on -device virtio-net-pci,netdev=spaceball0,mac=00:16:3e:00:08:01 -drive file=/dev/volume01/G-spaceball,if=virtio -vga qxl -spice port=5957,disable-ticketing -monitor telnet:192.168.0.254:10007,server,nowait,nodelay -pidfile /var/run/kvm/spaceball.pid [Thread debugging using libthread_db enabled] do_spice_init: starting 0.6.0 spice_server_add_interface: SPICE_INTERFACE_KEYBOARD spice_server_add_interface: SPICE_INTERFACE_MOUSE [New Thread 0x74802710 (LWP 30294)] spice_server_add_interface: SPICE_INTERFACE_QXL [New Thread 0x7fffaacae710 (LWP 30295)] red_worker_main: begin handle_dev_destroy_surfaces: handle_dev_destroy_surfaces: handle_dev_input: start [New Thread 0x7fffaa4ad710 (LWP 30298)] [New Thread 0x7fffa9cac710 (LWP 30299)] [New Thread 0x7fffa94ab710 (LWP 30300)] [New Thread 0x7fffa8caa710 (LWP 30301)] [New Thread 0x7fffa3fff710 (LWP 30302)] [New Thread 0x7fffa37fe710 (LWP 30303)] [New Thread 0x7fffa2ffd710 (LWP 30304)] [New Thread 0x7fffa27fc710 (LWP 30305)] [New Thread 0x7fffa1ffb710 (LWP 30306)] [New Thread 0x7fffa17fa710 (LWP 30307)] reds_handle_main_link: reds_show_new_channel: channel 1:0, connected successfully, over Non Secure link reds_main_handle_message: net test: latency 5.636000 ms, bitrate 11027768 bps (10.516899 Mbps) reds_show_new_channel: channel 2:0, connected successfully, over Non Secure link red_dispatcher_set_peer: handle_dev_input: connect handle_new_display_channel: jpeg disabled handle_new_display_channel: zlib-over-glz disabled reds_show_new_channel: channel 4:0, connected successfully, over Non Secure link red_dispatcher_set_cursor_peer: handle_dev_input: cursor connect reds_show_new_channel: channel 3:0, connected successfully, over Non Secure link inputs_link: [New Thread 0x7fffa07f8710 (LWP 30312)] [New Thread 0x7fff9fff7710 (LWP 30313)] [New Thread 0x7fff9f7f6710 (LWP 30314)] [New Thread 0x7fff9eff5710 (LWP 30315)] [New Thread 0x7fff9e7f4710 (LWP 30316)] [New Thread 0x7fff9dff3710 (LWP 30317)] [New Thread 0x7fff9d7f2710 (LWP 30318)] qemu-system-x86_64: /var/tmp/portage/app-emulation/qemu-kvm-0.14.0/work/qemu-kvm-0.14.0/qemu-kvm.c:1724: kvm_mutex_unlock: Assertion `!cpu_single_env' failed. Program received signal SIGABRT, Aborted. [Switching to Thread 0x74802710 (LWP 30294)] 0x75daa165 in raise () from /lib/libc.so.6 (gdb) (gdb) (gdb) (gdb) (gdb) bt #0 0x75daa165 in raise () from /lib/libc.so.6 #1 0x75dab580 in abort () from /lib/libc.so.6 #2 0x75da3201 in __assert_fail () from /lib/libc.so.6 #3 0x00436f7e in kvm_mutex_unlock () at /var/tmp/portage/app-emulation/qemu-kvm-0.14.0/work/qemu-kvm-0.14.0/qemu-kvm.c:1724 #4 qemu_mutex_unlock_iothread ()
Re: [Qemu-devel] Re: kvm crashes with spice while loading qxl
On 2011-02-27 20:03, Alon Levy wrote: On Sat, Feb 26, 2011 at 01:29:01PM +0100, Jan Kiszka wrote: On 2011-02-26 12:43, xming wrote: When trying to start X (and it loads qxl driver) the kvm process just crashes. This is fixed by Gerd's attached patch (taken from rhel repository, don't know why it wasn't pushed to qemu-kvm upstream). I'll send it to kvm list as well (separate email). Patch looks OK on first glance, but the changelog is misleading: This was broken for _both_ trees, but upstream didn't detect the bug. My concerns regarding other side effects of juggling with global mutex in spice code remain. Jan signature.asc Description: OpenPGP digital signature
Re: [Qemu-devel] Re: kvm crashes with spice while loading qxl
On Sun, Feb 27, 2011 at 08:11:26PM +0100, Jan Kiszka wrote: On 2011-02-27 20:03, Alon Levy wrote: On Sat, Feb 26, 2011 at 01:29:01PM +0100, Jan Kiszka wrote: On 2011-02-26 12:43, xming wrote: When trying to start X (and it loads qxl driver) the kvm process just crashes. This is fixed by Gerd's attached patch (taken from rhel repository, don't know why it wasn't pushed to qemu-kvm upstream). I'll send it to kvm list as well (separate email). Patch looks OK on first glance, but the changelog is misleading: This was broken for _both_ trees, but upstream didn't detect the bug. The trees the patch commit message refers to are qemu and qemu-kvm. qemu doesn't even have cpu_single_env. It didn't talk about two qemu-kvm trees. My concerns regarding other side effects of juggling with global mutex in spice code remain. I know there used to be a mutex in spice code and during the upstreaming process it got ditched in favor of the qemu global io mutex. I would have rather deferred this to Gerd since he wrote this, but he is not available atm. Jan -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [Qemu-devel] Re: kvm crashes with spice while loading qxl
On 2011-02-27 20:16, Alon Levy wrote: On Sun, Feb 27, 2011 at 08:11:26PM +0100, Jan Kiszka wrote: On 2011-02-27 20:03, Alon Levy wrote: On Sat, Feb 26, 2011 at 01:29:01PM +0100, Jan Kiszka wrote: On 2011-02-26 12:43, xming wrote: When trying to start X (and it loads qxl driver) the kvm process just crashes. This is fixed by Gerd's attached patch (taken from rhel repository, don't know why it wasn't pushed to qemu-kvm upstream). I'll send it to kvm list as well (separate email). Patch looks OK on first glance, but the changelog is misleading: This was broken for _both_ trees, but upstream didn't detect the bug. The trees the patch commit message refers to are qemu and qemu-kvm. The same did I. qemu doesn't even have cpu_single_env. Really? Check again. :) It didn't talk about two qemu-kvm trees. My concerns regarding other side effects of juggling with global mutex in spice code remain. I know there used to be a mutex in spice code and during the upstreaming process it got ditched in favor of the qemu global io mutex. I would have rather deferred this to Gerd since he wrote this, but he is not available atm. It's not necessarily bad to drop the io mutex, but it is more tricky than it may appear on first glance. Jan signature.asc Description: OpenPGP digital signature
Re: [Qemu-devel] Re: kvm crashes with spice while loading qxl
On Sun, Feb 27, 2011 at 08:27:01PM +0100, Jan Kiszka wrote: On 2011-02-27 20:16, Alon Levy wrote: On Sun, Feb 27, 2011 at 08:11:26PM +0100, Jan Kiszka wrote: On 2011-02-27 20:03, Alon Levy wrote: On Sat, Feb 26, 2011 at 01:29:01PM +0100, Jan Kiszka wrote: On 2011-02-26 12:43, xming wrote: When trying to start X (and it loads qxl driver) the kvm process just crashes. This is fixed by Gerd's attached patch (taken from rhel repository, don't know why it wasn't pushed to qemu-kvm upstream). I'll send it to kvm list as well (separate email). Patch looks OK on first glance, but the changelog is misleading: This was broken for _both_ trees, but upstream didn't detect the bug. The trees the patch commit message refers to are qemu and qemu-kvm. The same did I. qemu doesn't even have cpu_single_env. Really? Check again. :) Sorry, grepped the wrong repo. I'll send this to qemu-devel too then. It didn't talk about two qemu-kvm trees. My concerns regarding other side effects of juggling with global mutex in spice code remain. I know there used to be a mutex in spice code and during the upstreaming process it got ditched in favor of the qemu global io mutex. I would have rather deferred this to Gerd since he wrote this, but he is not available atm. It's not necessarily bad to drop the io mutex, but it is more tricky than it may appear on first glance. Jan -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [Qemu-devel] Re: kvm crashes with spice while loading qxl
On Sun, Feb 27, 2011 at 08:27:01PM +0100, Jan Kiszka wrote: On 2011-02-27 20:16, Alon Levy wrote: On Sun, Feb 27, 2011 at 08:11:26PM +0100, Jan Kiszka wrote: On 2011-02-27 20:03, Alon Levy wrote: On Sat, Feb 26, 2011 at 01:29:01PM +0100, Jan Kiszka wrote: On 2011-02-26 12:43, xming wrote: When trying to start X (and it loads qxl driver) the kvm process just crashes. This is fixed by Gerd's attached patch (taken from rhel repository, don't know why it wasn't pushed to qemu-kvm upstream). I'll send it to kvm list as well (separate email). Patch looks OK on first glance, but the changelog is misleading: This was broken for _both_ trees, but upstream didn't detect the bug. The trees the patch commit message refers to are qemu and qemu-kvm. The same did I. qemu doesn't even have cpu_single_env. Really? Check again. :) It didn't talk about two qemu-kvm trees. My concerns regarding other side effects of juggling with global mutex in spice code remain. I know there used to be a mutex in spice code and during the upstreaming process it got ditched in favor of the qemu global io mutex. I would have rather deferred this to Gerd since he wrote this, but he is not available atm. It's not necessarily bad to drop the io mutex, but it is more tricky than it may appear on first glance. The problem with not dropping it is that we may be in vga mode and create updates synthtically (i.e. qemu created and not driver created) that access the framebuffer and need to be locked so the framebuffer isn't updated at the same time. We drop the mutex only when we are about to call the dispatcher, which basically waits on red_worker (a libspice-server thread) to do some work. red_worker may in turn callback into qxl in qemu, which may try to acquire the lock. (the many may's here are just reflections of the codepaths). Jan -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
