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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 qemu-guest-agent: freeze-hook to ignore dpkg files as well 2018-08-23 18:46:25 +02:00
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 scripts: Switch to more portable Perl shebang 2017-05-10 10:19:24 +03:00
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