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-other: 0.734
-KVM: 0.713
-vnc: 0.682
-mistranslation: 0.649
-graphic: 0.630
-device: 0.623
-instruction: 0.581
-semantic: 0.577
-assembly: 0.529
-network: 0.525
-boot: 0.478
-socket: 0.462
-
-[RESEND][BUG FIX HELP] QEMU main thread endlessly hangs in __ppoll()
-
-Hi Genius,
-I am a user of QEMU v4.2.0 and stuck in an interesting bug, which may still
-exist in the mainline.
-Thanks in advance to heroes who can take a look and share understanding.
-
-The qemu main thread endlessly hangs in the handle of the qmp statement:
-{'execute': 'human-monitor-command', 'arguments':{ 'command-line':
-'drive_del replication0' } }
-and we have the call trace looks like:
-#0 0x00007f3c22045bf6 in __ppoll (fds=0x555611328410, nfds=1,
-timeout=<optimized out>, timeout@entry=0x7ffc56c66db0,
-sigmask=sigmask@entry=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:44
-#1 0x000055561021f415 in ppoll (__ss=0x0, __timeout=0x7ffc56c66db0,
-__nfds=<optimized out>, __fds=<optimized out>)
-at /usr/include/x86_64-linux-gnu/bits/poll2.h:77
-#2 qemu_poll_ns (fds=<optimized out>, nfds=<optimized out>,
-timeout=<optimized out>) at util/qemu-timer.c:348
-#3 0x0000555610221430 in aio_poll (ctx=ctx@entry=0x5556113010f0,
-blocking=blocking@entry=true) at util/aio-posix.c:669
-#4 0x000055561019268d in bdrv_do_drained_begin (poll=true,
-ignore_bds_parents=false, parent=0x0, recursive=false,
-bs=0x55561138b0a0) at block/io.c:430
-#5 bdrv_do_drained_begin (bs=0x55561138b0a0, recursive=<optimized out>,
-parent=0x0, ignore_bds_parents=<optimized out>,
-poll=<optimized out>) at block/io.c:396
-#6 0x000055561017b60b in quorum_del_child (bs=0x55561138b0a0,
-child=0x7f36dc0ce380, errp=<optimized out>)
-at block/quorum.c:1063
-#7 0x000055560ff5836b in qmp_x_blockdev_change (parent=0x555612373120
-"colo-disk0", has_child=<optimized out>,
-child=0x5556112df3e0 "children.1", has_node=<optimized out>, node=0x0,
-errp=0x7ffc56c66f98) at blockdev.c:4494
-#8 0x00005556100f8f57 in qmp_marshal_x_blockdev_change (args=<optimized
-out>, ret=<optimized out>, errp=0x7ffc56c67018)
-at qapi/qapi-commands-block-core.c:1538
-#9 0x00005556101d8290 in do_qmp_dispatch (errp=0x7ffc56c67010,
-allow_oob=<optimized out>, request=<optimized out>,
-cmds=0x5556109c69a0 <qmp_commands>) at qapi/qmp-dispatch.c:132
-#10 qmp_dispatch (cmds=0x5556109c69a0 <qmp_commands>, request=<optimized
-out>, allow_oob=<optimized out>)
-at qapi/qmp-dispatch.c:175
-#11 0x00005556100d4c4d in monitor_qmp_dispatch (mon=0x5556113a6f40,
-req=<optimized out>) at monitor/qmp.c:145
-#12 0x00005556100d5437 in monitor_qmp_bh_dispatcher (data=<optimized out>)
-at monitor/qmp.c:234
-#13 0x000055561021dbec in aio_bh_call (bh=0x5556112164bGrateful0) at
-util/async.c:117
-#14 aio_bh_poll (ctx=ctx@entry=0x5556112151b0) at util/async.c:117
-#15 0x00005556102212c4 in aio_dispatch (ctx=0x5556112151b0) at
-util/aio-posix.c:459
-#16 0x000055561021dab2 in aio_ctx_dispatch (source=<optimized out>,
-callback=<optimized out>, user_data=<optimized out>)
-at util/async.c:260
-#17 0x00007f3c22302fbd in g_main_context_dispatch () from
-/lib/x86_64-linux-gnu/libglib-2.0.so.0
-#18 0x0000555610220358 in glib_pollfds_poll () at util/main-loop.c:219
-#19 os_host_main_loop_wait (timeout=<optimized out>) at util/main-loop.c:242
-#20 main_loop_wait (nonblocking=<optimized out>) at util/main-loop.c:518
-#21 0x000055560ff600fe in main_loop () at vl.c:1814
-#22 0x000055560fddbce9 in main (argc=<optimized out>, argv=<optimized out>,
-envp=<optimized out>) at vl.c:4503
-We found that we're doing endless check in the line of
-block/io.c:bdrv_do_drained_begin():
-BDRV_POLL_WHILE(bs, bdrv_drain_poll_top_level(bs, recursive, parent));
-and it turns out that the bdrv_drain_poll() always get true from:
-- bdrv_parent_drained_poll(bs, ignore_parent, ignore_bds_parents)
-- AND atomic_read(&bs->in_flight)
-
-I personally think this is a deadlock issue in the a QEMU block layer
-(as we know, we have some #FIXME comments in related codes, such as block
-permisson update).
-Any comments are welcome and appreciated.
-
----
-thx,likexu
-
-On 2/28/21 9:39 PM, Like Xu wrote:
-Hi Genius,
-I am a user of QEMU v4.2.0 and stuck in an interesting bug, which may
-still exist in the mainline.
-Thanks in advance to heroes who can take a look and share understanding.
-Do you have a test case that reproduces on 5.2? It'd be nice to know if
-it was still a problem in the latest source tree or not.
---js
-The qemu main thread endlessly hangs in the handle of the qmp statement:
-{'execute': 'human-monitor-command', 'arguments':{ 'command-line':
-'drive_del replication0' } }
-and we have the call trace looks like:
-#0 0x00007f3c22045bf6 in __ppoll (fds=0x555611328410, nfds=1,
-timeout=<optimized out>, timeout@entry=0x7ffc56c66db0,
-sigmask=sigmask@entry=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:44
-#1 0x000055561021f415 in ppoll (__ss=0x0, __timeout=0x7ffc56c66db0,
-__nfds=<optimized out>, __fds=<optimized out>)
-at /usr/include/x86_64-linux-gnu/bits/poll2.h:77
-#2 qemu_poll_ns (fds=<optimized out>, nfds=<optimized out>,
-timeout=<optimized out>) at util/qemu-timer.c:348
-#3 0x0000555610221430 in aio_poll (ctx=ctx@entry=0x5556113010f0,
-blocking=blocking@entry=true) at util/aio-posix.c:669
-#4 0x000055561019268d in bdrv_do_drained_begin (poll=true,
-ignore_bds_parents=false, parent=0x0, recursive=false,
-bs=0x55561138b0a0) at block/io.c:430
-#5 bdrv_do_drained_begin (bs=0x55561138b0a0, recursive=<optimized out>,
-parent=0x0, ignore_bds_parents=<optimized out>,
-poll=<optimized out>) at block/io.c:396
-#6 0x000055561017b60b in quorum_del_child (bs=0x55561138b0a0,
-child=0x7f36dc0ce380, errp=<optimized out>)
-at block/quorum.c:1063
-#7 0x000055560ff5836b in qmp_x_blockdev_change (parent=0x555612373120
-"colo-disk0", has_child=<optimized out>,
-child=0x5556112df3e0 "children.1", has_node=<optimized out>, node=0x0,
-errp=0x7ffc56c66f98) at blockdev.c:4494
-#8 0x00005556100f8f57 in qmp_marshal_x_blockdev_change (args=<optimized
-out>, ret=<optimized out>, errp=0x7ffc56c67018)
-at qapi/qapi-commands-block-core.c:1538
-#9 0x00005556101d8290 in do_qmp_dispatch (errp=0x7ffc56c67010,
-allow_oob=<optimized out>, request=<optimized out>,
-cmds=0x5556109c69a0 <qmp_commands>) at qapi/qmp-dispatch.c:132
-#10 qmp_dispatch (cmds=0x5556109c69a0 <qmp_commands>, request=<optimized
-out>, allow_oob=<optimized out>)
-at qapi/qmp-dispatch.c:175
-#11 0x00005556100d4c4d in monitor_qmp_dispatch (mon=0x5556113a6f40,
-req=<optimized out>) at monitor/qmp.c:145
-#12 0x00005556100d5437 in monitor_qmp_bh_dispatcher (data=<optimized
-out>) at monitor/qmp.c:234
-#13 0x000055561021dbec in aio_bh_call (bh=0x5556112164bGrateful0) at
-util/async.c:117
-#14 aio_bh_poll (ctx=ctx@entry=0x5556112151b0) at util/async.c:117
-#15 0x00005556102212c4 in aio_dispatch (ctx=0x5556112151b0) at
-util/aio-posix.c:459
-#16 0x000055561021dab2 in aio_ctx_dispatch (source=<optimized out>,
-callback=<optimized out>, user_data=<optimized out>)
-at util/async.c:260
-#17 0x00007f3c22302fbd in g_main_context_dispatch () from
-/lib/x86_64-linux-gnu/libglib-2.0.so.0
-#18 0x0000555610220358 in glib_pollfds_poll () at util/main-loop.c:219
-#19 os_host_main_loop_wait (timeout=<optimized out>) at
-util/main-loop.c:242
-#20 main_loop_wait (nonblocking=<optimized out>) at util/main-loop.c:518
-#21 0x000055560ff600fe in main_loop () at vl.c:1814
-#22 0x000055560fddbce9 in main (argc=<optimized out>, argv=<optimized
-out>, envp=<optimized out>) at vl.c:4503
-We found that we're doing endless check in the line of
-block/io.c:bdrv_do_drained_begin():
-    BDRV_POLL_WHILE(bs, bdrv_drain_poll_top_level(bs, recursive, parent));
-and it turns out that the bdrv_drain_poll() always get true from:
-- bdrv_parent_drained_poll(bs, ignore_parent, ignore_bds_parents)
-- AND atomic_read(&bs->in_flight)
-
-I personally think this is a deadlock issue in the a QEMU block layer
-(as we know, we have some #FIXME comments in related codes, such as
-block permisson update).
-Any comments are welcome and appreciated.
-
----
-thx,likexu
-
-Hi John,
-
-Thanks for your comment.
-
-On 2021/3/5 7:53, John Snow wrote:
-On 2/28/21 9:39 PM, Like Xu wrote:
-Hi Genius,
-I am a user of QEMU v4.2.0 and stuck in an interesting bug, which may
-still exist in the mainline.
-Thanks in advance to heroes who can take a look and share understanding.
-Do you have a test case that reproduces on 5.2? It'd be nice to know if it
-was still a problem in the latest source tree or not.
-We narrowed down the source of the bug, which basically came from
-the following qmp usage:
-{'execute': 'human-monitor-command', 'arguments':{ 'command-line':
-'drive_del replication0' } }
-One of the test cases is the COLO usage (docs/colo-proxy.txt).
-
-This issue is sporadic,the probability may be 1/15 for a io-heavy guest.
-
-I believe it's reproducible on 5.2 and the latest tree.
---js
-The qemu main thread endlessly hangs in the handle of the qmp statement:
-{'execute': 'human-monitor-command', 'arguments':{ 'command-line':
-'drive_del replication0' } }
-and we have the call trace looks like:
-#0 0x00007f3c22045bf6 in __ppoll (fds=0x555611328410, nfds=1,
-timeout=<optimized out>, timeout@entry=0x7ffc56c66db0,
-sigmask=sigmask@entry=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:44
-#1 0x000055561021f415 in ppoll (__ss=0x0, __timeout=0x7ffc56c66db0,
-__nfds=<optimized out>, __fds=<optimized out>)
-at /usr/include/x86_64-linux-gnu/bits/poll2.h:77
-#2 qemu_poll_ns (fds=<optimized out>, nfds=<optimized out>,
-timeout=<optimized out>) at util/qemu-timer.c:348
-#3 0x0000555610221430 in aio_poll (ctx=ctx@entry=0x5556113010f0,
-blocking=blocking@entry=true) at util/aio-posix.c:669
-#4 0x000055561019268d in bdrv_do_drained_begin (poll=true,
-ignore_bds_parents=false, parent=0x0, recursive=false,
-bs=0x55561138b0a0) at block/io.c:430
-#5 bdrv_do_drained_begin (bs=0x55561138b0a0, recursive=<optimized out>,
-parent=0x0, ignore_bds_parents=<optimized out>,
-poll=<optimized out>) at block/io.c:396
-#6 0x000055561017b60b in quorum_del_child (bs=0x55561138b0a0,
-child=0x7f36dc0ce380, errp=<optimized out>)
-at block/quorum.c:1063
-#7 0x000055560ff5836b in qmp_x_blockdev_change (parent=0x555612373120
-"colo-disk0", has_child=<optimized out>,
-child=0x5556112df3e0 "children.1", has_node=<optimized out>, node=0x0,
-errp=0x7ffc56c66f98) at blockdev.c:4494
-#8 0x00005556100f8f57 in qmp_marshal_x_blockdev_change (args=<optimized
-out>, ret=<optimized out>, errp=0x7ffc56c67018)
-at qapi/qapi-commands-block-core.c:1538
-#9 0x00005556101d8290 in do_qmp_dispatch (errp=0x7ffc56c67010,
-allow_oob=<optimized out>, request=<optimized out>,
-cmds=0x5556109c69a0 <qmp_commands>) at qapi/qmp-dispatch.c:132
-#10 qmp_dispatch (cmds=0x5556109c69a0 <qmp_commands>, request=<optimized
-out>, allow_oob=<optimized out>)
-at qapi/qmp-dispatch.c:175
-#11 0x00005556100d4c4d in monitor_qmp_dispatch (mon=0x5556113a6f40,
-req=<optimized out>) at monitor/qmp.c:145
-#12 0x00005556100d5437 in monitor_qmp_bh_dispatcher (data=<optimized
-out>) at monitor/qmp.c:234
-#13 0x000055561021dbec in aio_bh_call (bh=0x5556112164bGrateful0) at
-util/async.c:117
-#14 aio_bh_poll (ctx=ctx@entry=0x5556112151b0) at util/async.c:117
-#15 0x00005556102212c4 in aio_dispatch (ctx=0x5556112151b0) at
-util/aio-posix.c:459
-#16 0x000055561021dab2 in aio_ctx_dispatch (source=<optimized out>,
-callback=<optimized out>, user_data=<optimized out>)
-at util/async.c:260
-#17 0x00007f3c22302fbd in g_main_context_dispatch () from
-/lib/x86_64-linux-gnu/libglib-2.0.so.0
-#18 0x0000555610220358 in glib_pollfds_poll () at util/main-loop.c:219
-#19 os_host_main_loop_wait (timeout=<optimized out>) at util/main-loop.c:242
-#20 main_loop_wait (nonblocking=<optimized out>) at util/main-loop.c:518
-#21 0x000055560ff600fe in main_loop () at vl.c:1814
-#22 0x000055560fddbce9 in main (argc=<optimized out>, argv=<optimized
-out>, envp=<optimized out>) at vl.c:4503
-We found that we're doing endless check in the line of
-block/io.c:bdrv_do_drained_begin():
-     BDRV_POLL_WHILE(bs, bdrv_drain_poll_top_level(bs, recursive, parent));
-and it turns out that the bdrv_drain_poll() always get true from:
-- bdrv_parent_drained_poll(bs, ignore_parent, ignore_bds_parents)
-- AND atomic_read(&bs->in_flight)
-
-I personally think this is a deadlock issue in the a QEMU block layer
-(as we know, we have some #FIXME comments in related codes, such as block
-permisson update).
-Any comments are welcome and appreciated.
-
----
-thx,likexu
-
-On 3/4/21 10:08 PM, Like Xu wrote:
-Hi John,
-
-Thanks for your comment.
-
-On 2021/3/5 7:53, John Snow wrote:
-On 2/28/21 9:39 PM, Like Xu wrote:
-Hi Genius,
-I am a user of QEMU v4.2.0 and stuck in an interesting bug, which may
-still exist in the mainline.
-Thanks in advance to heroes who can take a look and share understanding.
-Do you have a test case that reproduces on 5.2? It'd be nice to know
-if it was still a problem in the latest source tree or not.
-We narrowed down the source of the bug, which basically came from
-the following qmp usage:
-{'execute': 'human-monitor-command', 'arguments':{ 'command-line':
-'drive_del replication0' } }
-One of the test cases is the COLO usage (docs/colo-proxy.txt).
-
-This issue is sporadic,the probability may be 1/15 for a io-heavy guest.
-
-I believe it's reproducible on 5.2 and the latest tree.
-Can you please test and confirm that this is the case, and then file a
-bug report on the LP:
-https://launchpad.net/qemu
-and include:
-- The exact commit you used (current origin/master debug build would be
-the most ideal.)
-- Which QEMU binary you are using (qemu-system-x86_64?)
-- The shortest command line you are aware of that reproduces the problem
-- The host OS and kernel version
-- An updated call trace
-- Any relevant commands issued prior to the one that caused the hang; or
-detailed reproduction steps if possible.
-Thanks,
---js
-