91005a495e
Dirty map addition and removal functions are not acquiring to BDS AioContext, while they may call to code that expects it to be acquired. This may trigger a crash with a stack trace like this one: #0 0x00007f0ef146370f in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50 #1 0x00007f0ef144db25 in __GI_abort () at abort.c:79 #2 0x0000565022294dce in error_exit (err=<optimized out>, msg=msg@entry=0x56502243a730 <__func__.16350> "qemu_mutex_unlock_impl") at util/qemu-thread-posix.c:36 #3 0x00005650222950ba in qemu_mutex_unlock_impl (mutex=mutex@entry=0x5650244b0240, file=file@entry=0x565022439adf "util/async.c", line=line@entry=526) at util/qemu-thread-posix.c:108 #4 0x0000565022290029 in aio_context_release (ctx=ctx@entry=0x5650244b01e0) at util/async.c:526 #5 0x000056502221cd08 in bdrv_can_store_new_dirty_bitmap (bs=bs@entry=0x5650244dc820, name=name@entry=0x56502481d360 "bitmap1", granularity=granularity@entry=65536, errp=errp@entry=0x7fff22831718) at block/dirty-bitmap.c:542 #6 0x000056502206ae53 in qmp_block_dirty_bitmap_add (errp=0x7fff22831718, disabled=false, has_disabled=<optimized out>, persistent=<optimized out>, has_persistent=true, granularity=65536, has_granularity=<optimized out>, name=0x56502481d360 "bitmap1", node=<optimized out>) at blockdev.c:2894 #7 0x000056502206ae53 in qmp_block_dirty_bitmap_add (node=<optimized out>, name=0x56502481d360 "bitmap1", has_granularity=<optimized out>, granularity=<optimized out>, has_persistent=true, persistent=<optimized out>, has_disabled=false, disabled=false, errp=0x7fff22831718) at blockdev.c:2856 #8 0x00005650221847a3 in qmp_marshal_block_dirty_bitmap_add (args=<optimized out>, ret=<optimized out>, errp=0x7fff22831798) at qapi/qapi-commands-block-core.c:651 #9 0x0000565022247e6c in do_qmp_dispatch (errp=0x7fff22831790, allow_oob=<optimized out>, request=<optimized out>, cmds=0x565022b32d60 <qmp_commands>) at qapi/qmp-dispatch.c:132 #10 0x0000565022247e6c in qmp_dispatch (cmds=0x565022b32d60 <qmp_commands>, request=<optimized out>, allow_oob=<optimized out>) at qapi/qmp-dispatch.c:175 #11 0x0000565022166061 in monitor_qmp_dispatch (mon=0x56502450faa0, req=<optimized out>) at monitor/qmp.c:145 #12 0x00005650221666fa in monitor_qmp_bh_dispatcher (data=<optimized out>) at monitor/qmp.c:234 #13 0x000056502228f866 in aio_bh_call (bh=0x56502440eae0) at util/async.c:117 #14 0x000056502228f866 in aio_bh_poll (ctx=ctx@entry=0x56502440d7a0) at util/async.c:117 #15 0x0000565022292c54 in aio_dispatch (ctx=0x56502440d7a0) at util/aio-posix.c:459 #16 0x000056502228f742 in aio_ctx_dispatch (source=<optimized out>, callback=<optimized out>, user_data=<optimized out>) at util/async.c:260 #17 0x00007f0ef5ce667d in g_main_dispatch (context=0x56502449aa40) at gmain.c:3176 #18 0x00007f0ef5ce667d in g_main_context_dispatch (context=context@entry=0x56502449aa40) at gmain.c:3829 #19 0x0000565022291d08 in glib_pollfds_poll () at util/main-loop.c:219 #20 0x0000565022291d08 in os_host_main_loop_wait (timeout=<optimized out>) at util/main-loop.c:242 #21 0x0000565022291d08 in main_loop_wait (nonblocking=<optimized out>) at util/main-loop.c:518 #22 0x00005650220743c1 in main_loop () at vl.c:1828 #23 0x0000565021f20a72 in main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at vl.c:4504 Fix this by acquiring the AioContext at qmp_block_dirty_bitmap_add() and qmp_block_dirty_bitmap_add(). RHBZ: https://bugzilla.redhat.com/show_bug.cgi?id=1782175 Signed-off-by: Sergio Lopez <slp@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com> |
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.gitlab-ci.d/edk2 | ||
accel | ||
audio | ||
authz | ||
backends | ||
block | ||
bsd-user | ||
capstone@22ead3e0bf | ||
chardev | ||
contrib | ||
crypto | ||
default-configs | ||
disas | ||
docs | ||
dtc@88f18909db | ||
dump | ||
fpu | ||
fsdev | ||
gdb-xml | ||
hw | ||
include | ||
io | ||
libdecnumber | ||
linux-headers | ||
linux-user | ||
migration | ||
monitor | ||
nbd | ||
net | ||
pc-bios | ||
plugins | ||
po | ||
python/qemu | ||
qapi | ||
qga | ||
qobject | ||
qom | ||
replay | ||
roms | ||
scripts | ||
scsi | ||
slirp@126c04acba | ||
stubs | ||
target | ||
tcg | ||
tests | ||
tools/virtiofsd | ||
trace | ||
ui | ||
util | ||
.cirrus.yml | ||
.dir-locals.el | ||
.editorconfig | ||
.exrc | ||
.gdbinit | ||
.gitignore | ||
.gitlab-ci-edk2.yml | ||
.gitlab-ci.yml | ||
.gitmodules | ||
.gitpublish | ||
.mailmap | ||
.patchew.yml | ||
.shippable.yml | ||
.travis.yml | ||
arch_init.c | ||
balloon.c | ||
block.c | ||
blockdev-nbd.c | ||
blockdev.c | ||
blockjob.c | ||
bootdevice.c | ||
Changelog | ||
CODING_STYLE.rst | ||
configure | ||
COPYING | ||
COPYING.LIB | ||
cpus-common.c | ||
cpus.c | ||
device_tree.c | ||
device-hotplug.c | ||
disas.c | ||
dma-helpers.c | ||
exec-vary.c | ||
exec.c | ||
gdbstub.c | ||
gitdm.config | ||
hmp-commands-info.hx | ||
hmp-commands.hx | ||
ioport.c | ||
iothread.c | ||
job-qmp.c | ||
job.c | ||
Kconfig.host | ||
LICENSE | ||
MAINTAINERS | ||
Makefile | ||
Makefile.objs | ||
Makefile.target | ||
memory_ldst.inc.c | ||
memory_mapping.c | ||
memory.c | ||
module-common.c | ||
os-posix.c | ||
os-win32.c | ||
qdev-monitor.c | ||
qemu-bridge-helper.c | ||
qemu-deprecated.texi | ||
qemu-doc.texi | ||
qemu-edid.c | ||
qemu-img-cmds.hx | ||
qemu-img.c | ||
qemu-img.texi | ||
qemu-io-cmds.c | ||
qemu-io.c | ||
qemu-keymap.c | ||
qemu-nbd.c | ||
qemu-option-trace.texi | ||
qemu-options-wrapper.h | ||
qemu-options.h | ||
qemu-options.hx | ||
qemu-seccomp.c | ||
qemu-tech.texi | ||
qemu.nsi | ||
qemu.sasl | ||
qtest.c | ||
README.rst | ||
replication.c | ||
replication.h | ||
rules.mak | ||
thunk.c | ||
tpm.c | ||
trace-events | ||
VERSION | ||
version.rc | ||
vl.c |
=========== QEMU README =========== QEMU is a generic and open source machine & userspace emulator and virtualizer. QEMU is capable of emulating a complete machine in software without any need for hardware virtualization support. By using dynamic translation, it achieves very good performance. QEMU can also integrate with the Xen and KVM hypervisors to provide emulated hardware while allowing the hypervisor to manage the CPU. With hypervisor support, QEMU can achieve near native performance for CPUs. When QEMU emulates CPUs directly it is capable of running operating systems made for one machine (e.g. an ARMv7 board) on a different machine (e.g. an x86_64 PC board). QEMU is also capable of providing userspace API virtualization for Linux and BSD kernel interfaces. This allows binaries compiled against one architecture ABI (e.g. the Linux PPC64 ABI) to be run on a host using a different architecture ABI (e.g. the Linux x86_64 ABI). This does not involve any hardware emulation, simply CPU and syscall emulation. QEMU aims to fit into a variety of use cases. It can be invoked directly by users wishing to have full control over its behaviour and settings. It also aims to facilitate integration into higher level management layers, by providing a stable command line interface and monitor API. It is commonly invoked indirectly via the libvirt library when using open source applications such as oVirt, OpenStack and virt-manager. QEMU as a whole is released under the GNU General Public License, version 2. For full licensing details, consult the LICENSE file. Building ======== QEMU is multi-platform software intended to be buildable on all modern Linux platforms, OS-X, Win32 (via the Mingw64 toolchain) and a variety of other UNIX targets. The simple steps to build QEMU are: .. code-block:: shell mkdir build cd build ../configure make Additional information can also be found online via the QEMU website: * `<https://qemu.org/Hosts/Linux>`_ * `<https://qemu.org/Hosts/Mac>`_ * `<https://qemu.org/Hosts/W32>`_ Submitting patches ================== The QEMU source code is maintained under the GIT version control system. .. code-block:: shell git clone https://git.qemu.org/git/qemu.git When submitting patches, one common approach is to use 'git format-patch' and/or 'git send-email' to format & send the mail to the qemu-devel@nongnu.org mailing list. All patches submitted must contain a 'Signed-off-by' line from the author. Patches should follow the guidelines set out in the CODING_STYLE.rst file. Additional information on submitting patches can be found online via the QEMU website * `<https://qemu.org/Contribute/SubmitAPatch>`_ * `<https://qemu.org/Contribute/TrivialPatches>`_ The QEMU website is also maintained under source control. .. code-block:: shell git clone https://git.qemu.org/git/qemu-web.git * `<https://www.qemu.org/2017/02/04/the-new-qemu-website-is-up/>`_ A 'git-publish' utility was created to make above process less cumbersome, and is highly recommended for making regular contributions, or even just for sending consecutive patch series revisions. It also requires a working 'git send-email' setup, and by default doesn't automate everything, so you may want to go through the above steps manually for once. For installation instructions, please go to * `<https://github.com/stefanha/git-publish>`_ The workflow with 'git-publish' is: .. code-block:: shell $ git checkout master -b my-feature $ # work on new commits, add your 'Signed-off-by' lines to each $ git publish Your patch series will be sent and tagged as my-feature-v1 if you need to refer back to it in the future. Sending v2: .. code-block:: shell $ git checkout my-feature # same topic branch $ # making changes to the commits (using 'git rebase', for example) $ git publish Your patch series will be sent with 'v2' tag in the subject and the git tip will be tagged as my-feature-v2. Bug reporting ============= The QEMU project uses Launchpad as its primary upstream bug tracker. Bugs found when running code built from QEMU git or upstream released sources should be reported via: * `<https://bugs.launchpad.net/qemu/>`_ If using QEMU via an operating system vendor pre-built binary package, it is preferable to report bugs to the vendor's own bug tracker first. If the bug is also known to affect latest upstream code, it can also be reported via launchpad. For additional information on bug reporting consult: * `<https://qemu.org/Contribute/ReportABug>`_ Contact ======= The QEMU community can be contacted in a number of ways, with the two main methods being email and IRC * `<mailto:qemu-devel@nongnu.org>`_ * `<https://lists.nongnu.org/mailman/listinfo/qemu-devel>`_ * #qemu on irc.oftc.net Information on additional methods of contacting the community can be found online via the QEMU website: * `<https://qemu.org/Contribute/StartHere>`_