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qemu / qemu / 3c80ca158c96ff902a30883a8933e755988948b1
commit3c80ca158c96ff902a30883a8933e755988948b1[log] [tgz]
authorStefan Hajnoczi <stefanha@redhat.com>Tue Jul 15 16:44:26 2014 +0200
committerKevin Wolf <kwolf@redhat.com>Fri Aug 15 15:07:14 2014 +0200
treec1ccc27a2148e1173950d276838803bc5fafcec8
parentc2e50e3d11a0bf4c973cc30478c1af0f2d5f8e81 [diff]
thread-pool: avoid deadlock in nested aio_poll() calls

The thread pool has a race condition if two elements complete before
thread_pool_completion_bh() runs:

  If element A's callback waits for element B using aio_poll() it will
  deadlock since pool->completion_bh is not marked scheduled when the
  nested aio_poll() runs.

Fix this by marking the BH scheduled while thread_pool_completion_bh()
is executing.  This way any nested aio_poll() loops will enter
thread_pool_completion_bh() and complete the remaining elements.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
1 file changed
tree: c1ccc27a2148e1173950d276838803bc5fafcec8
  1. audio/
  2. backends/
  3. block/
  4. bsd-user/
  5. default-configs/
  6. disas/
  7. docs/
  8. fpu/
  9. fsdev/
  10. gdb-xml/
  11. hw/
  12. include/
  13. libcacard/
  14. libdecnumber/
  15. linux-headers/
  16. linux-user/
  17. net/
  18. pc-bios/
  19. po/
  20. qapi/
  21. qga/
  22. qobject/
  23. qom/
  24. roms/
  25. scripts/
  26. slirp/
  27. stubs/
  28. sysconfigs/
  29. target-alpha/
  30. target-arm/
  31. target-cris/
  32. target-i386/
  33. target-lm32/
  34. target-m68k/
  35. target-microblaze/
  36. target-mips/
  37. target-moxie/
  38. target-openrisc/
  39. target-ppc/
  40. target-s390x/
  41. target-sh4/
  42. target-sparc/
  43. target-unicore32/
  44. target-xtensa/
  45. tcg/
  46. tests/
  47. trace/
  48. ui/
  49. util/
  50. dtc
  51. pixman
  52. .exrc
  53. .gitignore
  54. .gitmodules
  55. .mailmap
  56. .travis.yml
  57. aio-posix.c
  58. aio-win32.c
  59. arch_init.c
  60. async.c
  61. balloon.c
  62. block-migration.c
  63. block.c
  64. blockdev-nbd.c
  65. blockdev.c
  66. blockjob.c
  67. bt-host.c
  68. bt-vhci.c
  69. Changelog
  70. CODING_STYLE
  71. configure
  72. COPYING
  73. COPYING.LIB
  74. coroutine-gthread.c
  75. coroutine-sigaltstack.c
  76. coroutine-ucontext.c
  77. coroutine-win32.c
  78. cpu-exec.c
  79. cpus.c
  80. cputlb.c
  81. device-hotplug.c
  82. device_tree.c
  83. disas.c
  84. dma-helpers.c
  85. dump.c
  86. exec.c
  87. gdbstub.c
  88. HACKING
  89. hmp-commands.hx
  90. hmp.c
  91. hmp.h
  92. iohandler.c
  93. ioport.c
  94. iothread.c
  95. kvm-all.c
  96. kvm-stub.c
  97. LICENSE
  98. main-loop.c
  99. MAINTAINERS
  100. Makefile
  101. Makefile.objs
  102. Makefile.target
  103. memory.c
  104. memory_mapping.c
  105. migration-exec.c
  106. migration-fd.c
  107. migration-rdma.c
  108. migration-tcp.c
  109. migration-unix.c
  110. migration.c
  111. module-common.c
  112. monitor.c
  113. nbd.c
  114. numa.c
  115. os-posix.c
  116. os-win32.c
  117. page_cache.c
  118. qapi-schema.json
  119. qdev-monitor.c
  120. qdict-test-data.txt
  121. qemu-bridge-helper.c
  122. qemu-char.c
  123. qemu-coroutine-io.c
  124. qemu-coroutine-lock.c
  125. qemu-coroutine-sleep.c
  126. qemu-coroutine.c
  127. qemu-doc.texi
  128. qemu-file.c
  129. qemu-img-cmds.hx
  130. qemu-img.c
  131. qemu-img.texi
  132. qemu-io-cmds.c
  133. qemu-io.c
  134. qemu-log.c
  135. qemu-nbd.c
  136. qemu-nbd.texi
  137. qemu-options-wrapper.h
  138. qemu-options.h
  139. qemu-options.hx
  140. qemu-seccomp.c
  141. qemu-tech.texi
  142. qemu-timer.c
  143. qemu.nsi
  144. qemu.sasl
  145. qmp-commands.hx
  146. qmp.c
  147. qtest.c
  148. README
  149. rules.mak
  150. savevm.c
  151. softmmu_template.h
  152. spice-qemu-char.c
  153. tcg-runtime.c
  154. tci.c
  155. thread-pool.c
  156. thunk.c
  157. tpm.c
  158. trace-events
  159. translate-all.c
  160. translate-all.h
  161. user-exec.c
  162. VERSION
  163. version.rc
  164. vl.c
  165. vmstate.c
  166. xbzrle.c
  167. xen-common-stub.c
  168. xen-common.c
  169. xen-hvm-stub.c
  170. xen-hvm.c
  171. xen-mapcache.c