Kevin Wolf 6bc0bcc89f block: Fix deadlocks in bdrv_graph_wrunlock() ... bdrv_graph_wrunlock() calls aio_poll(), which may run callbacks that have a nested event loop. Nested event loops can depend on other iothreads making progress, so in order to allow them to make progress it must not hold the AioContext lock of another thread while calling aio_poll(). This introduces a @bs parameter to bdrv_graph_wrunlock() whose AioContext is temporarily dropped (which matches bdrv_graph_wrlock()), and a bdrv_graph_wrunlock_ctx() that can be used if the BlockDriverState doesn't necessarily exist any more when unlocking. This also requires a change to bdrv_schedule_unref(), which was relying on the incorrectly taken lock. It needs to take the lock itself now. While this is a separate bug, it can't be fixed a separate patch because otherwise the intermediate state would either deadlock or try to release a lock that we don't even hold. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Message-ID: <20231115172012.112727-3-kwolf@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> [kwolf: Fixed up bdrv_schedule_unref()] Signed-off-by: Kevin Wolf <kwolf@redhat.com>		2023-11-21 12:45:21 +01:00
..
ci	net: add initial support for AF_XDP network backend	2023-09-18 14:36:13 +08:00
coccinelle	cleanup: Tweak and re-run return_directly.cocci	2022-12-14 16:19:35 +01:00
codeconverter	scripts/: spelling fixes	2023-09-08 13:08:52 +03:00
coverage	scripts/coverage: initial coverage comparison script	2023-04-04 15:16:29 +01:00
coverity-scan	system: Rename softmmu/ directory as system/	2023-10-08 21:08:08 +02:00
kvm	target/i386: enumerate bit 56 of MSR_IA32_VMX_BASIC	2023-09-21 10:39:51 +02:00
modules	scripts/modules/module_block: Use Python 3 interpreter & add pseudo-main	2020-05-31 13:56:46 +02:00
oss-fuzz	system: Rename softmmu/ directory as system/	2023-10-08 21:08:08 +02:00
performance	scripts/: spelling fixes	2023-09-08 13:08:52 +03:00
qapi	qapi: Fix QAPISchemaEntity.__repr__()	2023-11-13 10:36:51 +01:00
qemu-guest-agent
qemugdb	scripts/gdb: implement 'qemu bt'	2021-01-12 12:38:03 +01:00
qmp	python: rename qemu.aqmp to qemu.qmp	2022-04-21 11:01:00 -04:00
simplebench	scripts/: spelling fixes	2023-09-08 13:08:52 +03:00
tracetool	tracetool: avoid invalid escape in Python string	2023-11-09 15:03:02 +08:00
analyse-9p-simpletrace.py	drop "from __future__ import print_function"	2020-02-07 15:15:16 +01:00
analyse-locks-simpletrace.py	scripts/analyse-locks-simpletrace.py: changed iteritems() to items()	2023-09-26 12:28:51 -04:00
analyze-inclusions	scripts/analyze-inclusions: drop qemu-common.h from analysis	2022-04-21 16:56:55 +04:00
analyze-migration.py	migration: Fix analyze-migration read operation signedness	2023-10-17 09:14:32 +02:00
archive-source.sh	make-release: do not ship dtc sources	2023-09-29 09:33:10 +02:00
block-coroutine-wrapper.py	block: Fix deadlocks in bdrv_graph_wrunlock()	2023-11-21 12:45:21 +01:00
check_sparse.py	meson: move sparse detection to Meson and rewrite check_sparse.py	2020-10-04 18:36:23 +02:00
checkpatch.pl	system: Rename softmmu/ directory as system/	2023-10-08 21:08:08 +02:00
clean-header-guards.pl	disas: Remove libvixl disassembler	2022-07-05 10:15:49 +02:00
clean-includes	scripts/clean-includes: Improve --git commit message	2023-02-08 07:16:23 +01:00
cleanup-trace-events.pl	scripts/cleanup-trace-events: Emit files in alphabetical order	2020-09-09 17:17:00 +01:00
cocci-macro-file.h	compiler.h: replace QEMU_NORETURN with G_NORETURN	2022-04-21 17:03:51 +04:00
cpu-x86-uarch-abi.py	scripts/cpu-x86-uarch-abi.py: Fix parameter error of cmd	2023-11-07 16:45:18 +00:00
decodetree.py	tests/decode: Suppress "error: " string for expected-failure tests	2023-07-25 10:56:52 +01:00
device-crash-test	python/qemu: rename command() to cmd()	2023-10-12 14:21:43 -04:00
disas-objdump.pl
dump-guest-memory.py	drop "from __future__ import print_function"	2020-02-07 15:15:16 +01:00
entitlement.sh	scripts/entitlement.sh: Use backward-compatible cp flags	2021-11-30 22:25:58 +01:00
extract-vsssdk-headers
feature_to_c.py	gdbstub: Add num_regs member to GDBFeature	2023-11-08 15:15:23 +00:00
fix-multiline-comments.sh	docs: move CODING_STYLE into the developer documentation	2021-02-24 11:05:21 +00:00
gensyscalls.sh	linux-user: Add LoongArch syscall support	2022-07-04 11:08:57 +05:30
get_maintainer.pl	scripts/get_maintainer.pl: don't print parentheses	2023-10-17 15:20:53 +02:00
git-submodule.sh	scripts/git-submodule.sh: Don't rely on non-POSIX 'read' behaviour	2023-07-25 10:56:51 +01:00
git.orderfile	scripts/git.orderfile: Display MAINTAINERS changes first	2023-01-13 16:22:57 +01:00
hxtool	meson: generate hxtool files	2020-08-21 06:30:14 -04:00
kernel-doc	scripts/kernel-doc: strip QEMU_ from function definitions	2021-03-24 14:24:40 +00:00
make-config-poison.sh	exec/poison: Do not poison CONFIG_SOFTMMU	2023-06-05 12:04:29 -07:00
make-release	make-release: do not ship dtc sources	2023-09-29 09:33:10 +02:00
meson-buildoptions.py	meson-buildoptions: document the data at the top	2023-10-18 10:01:02 +02:00
meson-buildoptions.sh	build-sys: add a "pixman" feature	2023-11-07 14:04:24 +04:00
meson.build	scripts: add a XML preprocessor script	2023-06-27 17:08:56 +02:00
minikconf.py	meson: infrastructure for building emulators	2020-08-21 06:30:17 -04:00
modinfo-collect.py	scripts: make sure scripts are invoked via $(PYTHON)	2023-05-19 20:40:29 +02:00
modinfo-generate.py	scripts: make sure scripts are invoked via $(PYTHON)	2023-05-19 20:40:29 +02:00
mtest2make.py	mtest2make.py: teach suite name that are just "PROJECT"	2023-04-20 11:17:34 +02:00
nsis.py	scripts/nsis.py: Automatically package required DLLs of QEMU executables	2022-10-31 10:06:11 +01:00
probe-gdb-support.py	scripts: make sure scripts are invoked via $(PYTHON)	2023-05-19 20:40:29 +02:00
python_qmp_updater.py	scripts: add python_qmp_updater.py	2023-10-12 14:21:44 -04:00
qapi-gen.py	qapi: move generator entrypoint into package	2020-10-10 11:37:47 +02:00
qemu-binfmt-conf.sh	scripts/qemu-binfmt-conf: Add LoongArch to qemu_get_family()	2022-07-05 16:17:53 +05:30
qemu-gdb.py	scripts/gdb: implement 'qemu bt'	2021-01-12 12:38:03 +01:00
qemu-stamp.py	meson, configure: move --with-pkgversion, CONFIG_STAMP to meson	2022-05-07 07:46:58 +02:00
qemu-trace-stap	qemu-trace-stap: changing SYSTEMTAP_TAPSET considered harmful.	2021-07-12 17:37:06 +01:00
qemu-version.sh	build-sys: fix git version from -version	2020-10-12 11:50:23 -04:00
qom-cast-macro-clean-cocci-gen.py	scripts: Add qom-cast-macro-clean-cocci-gen.py	2023-06-05 20:48:34 +02:00
refresh-pxe-roms.sh
render_block_graph.py	python/qemu: rename command() to cmd()	2023-10-12 14:21:43 -04:00
replay-dump.py	scripts/: spelling fixes	2023-09-08 13:08:52 +03:00
shaderinclude.py	build-sys: fix crlf-ending C code	2023-02-02 10:44:23 +00:00
signrom.py	drop "from __future__ import print_function"	2020-02-07 15:15:16 +01:00
simpletrace.py	simpletrace: added simplified Analyzer2 class	2023-09-26 12:28:51 -04:00
symlink-install-tree.py	Add information how to fix common build error on Windows in symlink-install-tree	2023-05-16 09:14:18 +02:00
tracetool.py	tracetool: add output filename command-line argument	2021-01-04 14:24:58 +00:00
u2f-setup-gen.py	scripts: Add u2f-setup-gen script	2020-08-31 08:23:39 +02:00
undefsym.py	build: fix macOS --enable-modules build	2020-10-22 11:53:52 -04:00
update-linux-headers.sh	scripts/update-linux-headers: Add iommufd.h	2023-10-18 10:10:49 +02:00
update-mips-syscall-args.sh	linux-user, mips: update syscall-args-o32.c.inc to Linux v5.13	2021-07-13 13:59:59 +02:00
update-syscalltbl.sh	linux-user, scripts: add a script to update syscall.tbl	2020-03-20 16:02:00 +01:00
userfaultfd-wrlat.py	migration: introduce 'userfaultfd-wrlat.py' script	2021-02-08 11:19:51 +00:00
vmstate-static-checker.py	vmstate-static-checker: Recognize "num" field	2023-04-27 10:18:26 +02:00
xen-detect.c	xen: Drop support for Xen versions below 4.7.1	2023-06-07 15:07:10 +01:00
xml-preprocess-test.py	scripts: add a XML preprocessor script	2023-06-27 17:08:56 +02:00
xml-preprocess.py	scripts/xml-preprocess: Make sure this script is invoked via the right Python	2023-10-12 00:37:39 +03:00