[Qemu-devel] [Bug 1481272] Re: main-loop: WARNING: I/O thread spun for 1000 iterations

[Sibiao Luo]

address@hidden qemu]# git bisect log
git bisect start
# bad: [074a9925e1cfd659d5376dcaccd1436d3840e611] Merge remote-tracking branch 
'remotes/cody/tags/block-pull-request' into staging
git bisect bad 074a9925e1cfd659d5376dcaccd1436d3840e611
# good: [dfa83a6bae960e3e3a3186264d75790cfd727bce] Update version for 2.3.1 
release
git bisect good dfa83a6bae960e3e3a3186264d75790cfd727bce
# good: [e5b3a24181ea0cebf1c5b20f44d016311b7048f0] Update version for v2.3.0 
release
git bisect good e5b3a24181ea0cebf1c5b20f44d016311b7048f0
# good: [afa25c4bb5bd0732dca4aa0691fd4682d242925f] Merge remote-tracking branch 
'remotes/kraxel/tags/pull-sdl-20150611-1' into staging
git bisect good afa25c4bb5bd0732dca4aa0691fd4682d242925f
# good: [922f893e57da24bc80db3e79bea56485d1c111fa] ahci: assert is_ncq for 
process_ncq
git bisect good 922f893e57da24bc80db3e79bea56485d1c111fa
# good: [711dc6f36b74fe65a6e5a1847f1152717d887f8a] Merge remote-tracking branch 
'remotes/cody/tags/jtc-for-upstream-pull-request' into staging
git bisect good 711dc6f36b74fe65a6e5a1847f1152717d887f8a
# bad: [226d007dbd75ec8d0f12d0f9e1ce66caf55d49e4] gdbstub: Set current CPU on 
interruptions
git bisect bad 226d007dbd75ec8d0f12d0f9e1ce66caf55d49e4
# good: [b9c46307996856d03ddc1527468ff5401ac03a79] Merge remote-tracking branch 
'remotes/mdroth/tags/qga-pull-2015-07-21-tag' into staging
git bisect good b9c46307996856d03ddc1527468ff5401ac03a79
# bad: [f793d97e454a56d17e404004867985622ca1a63b] Merge remote-tracking branch 
'remotes/bonzini/tags/for-upstream' into staging
git bisect bad f793d97e454a56d17e404004867985622ca1a63b
# bad: [80adb8fcad4778376a11d394a9e01516819e2327] tcg/aarch64: use 32-bit 
offset for 32-bit softmmu emulation
git bisect bad 80adb8fcad4778376a11d394a9e01516819e2327
# bad: [dc94bd9166af5236a56bd5bb06845911915a925c] Merge remote-tracking branch 
'remotes/stefanha/tags/block-pull-request' into staging
git bisect bad dc94bd9166af5236a56bd5bb06845911915a925c
# good: [6493c975af75be5b8d9ade954239bdf5492b7911] aio-win32: reorganize 
polling loop
git bisect good 6493c975af75be5b8d9ade954239bdf5492b7911
# good: [21a03d17f2edb1e63f7137d97ba355cc6f19d79f] AioContext: fix broken 
placement of event_notifier_test_and_clear
git bisect good 21a03d17f2edb1e63f7137d97ba355cc6f19d79f
# bad: [05e514b1d4d5bd4209e2c8bbc76ff05c85a235f3] AioContext: optimize clearing 
the EventNotifier
git bisect bad 05e514b1d4d5bd4209e2c8bbc76ff05c85a235f3

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https://bugs.launchpad.net/bugs/1481272

Title:
  main-loop: WARNING: I/O thread spun for 1000 iterations

Status in QEMU:
  New

Bug description:
  I compile the latest qemu to launch a VM but the monitor output the
  "main-loop: WARNING: I/O thread spun for 1000 iterations".

  # /usr/local/bin/qemu-system-x86_64 -name rhel6 -S -no-kvm -m 1024M -realtime 
mlock=off -smp 1,sockets=1,cores=1,threads=1 -uuid 
c9dd2a5c-40f2-fd3d-3c54-9cd84f8b9174 -rtc base=utc  -drive 
file=/home/samba-share/ubuntu.img,if=none,id=drive-virtio-disk0,format=qcow2,cache=none
 -device 
virtio-blk-pci,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=disk,serial=425618d4-871f-4021-bc5d-bcd7f1b5ca9c,bootindex=0
 -vnc :1 -boot menu=on -monitor stdio
  QEMU 2.3.93 monitor - type 'help' for more information
  (qemu) c
  (qemu) main-loop: WARNING: I/O thread spun for 1000 iterations               
<-----------------------

  qemu]# git branch -v
  * master               e95edef Merge remote-tracking branch 
'remotes/sstabellini/tags/xen-migration-2.4-tag' into staging

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