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[Qemu-devel] [Bug 1087114] Re: assertion "QLIST_EMPTY(&bs->tracked_reque


From: Brad Smith
Subject: [Qemu-devel] [Bug 1087114] Re: assertion "QLIST_EMPTY(&bs->tracked_requests)" failed
Date: Thu, 13 Dec 2012 10:16:01 -0000

I'm just finishing the bisection and think I have the commit that caused
this but I'm now just testing commits +-1 from that commit to make sure
and if it is will try reverting just that commit against HEAD as well.
Using the sigaltstack coroutine backend did not make any difference. I
actually am using that now and then reverted it when initially testing
1.3 to make sure that was not the source of the regression with no
change in behaviour at all. Also yes I would be using rthreads. All
development happens against -current.

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https://bugs.launchpad.net/bugs/1087114

Title:
  assertion "QLIST_EMPTY(&bs->tracked_requests)" failed

Status in QEMU:
  New

Bug description:
  QEMU 1.3.0 on OpenBSD now crashes with an error as shown below and the
  command line params do not seem to matter.

  assertion "QLIST_EMPTY(&bs->tracked_requests)" failed: file "block.c",
  line 1220, function "bdrv_drain_all"

  #1  0x0000030d1bce24aa in abort () at /usr/src/lib/libc/stdlib/abort.c:70
          p = (struct atexit *) 0x30d11897000
          mask = 4294967263
          cleanup_called = 1
  #2  0x0000030d1bc5ff44 in __assert2 (file=Variable "file" is not available.
  ) at /usr/src/lib/libc/gen/assert.c:52
  No locals.
  #3  0x0000030b0d383a03 in bdrv_drain_all () at block.c:1220
          bs = (BlockDriverState *) 0x30d13f3b630
          busy = false
          __func__ = "bdrv_drain_all"
  #4  0x0000030b0d43acfc in bmdma_cmd_writeb (bm=0x30d0f5f56a8, val=8) at 
hw/ide/pci.c:312
          __func__ = "bmdma_cmd_writeb"
  #5  0x0000030b0d43b450 in bmdma_write (opaque=0x30d0f5f56a8, addr=0, val=8, 
size=1) at hw/ide/piix.c:76
          bm = (BMDMAState *) 0x30d0f5f56a8
  #6  0x0000030b0d5c2ce6 in memory_region_write_accessor (opaque=0x30d0f5f57d0, 
addr=0, value=0x30d18c288f0, size=1, shift=0, mask=255)
      at /home/ports/pobj/qemu-1.3.0-debug/qemu-1.3.0/memory.c:334
          mr = (MemoryRegion *) 0x30d0f5f57d0
          tmp = 8
  #7  0x0000030b0d5c2dc5 in access_with_adjusted_size (addr=0, 
value=0x30d18c288f0, size=1, access_size_min=1, access_size_max=4, 
      access=0x30b0d5c2c6b <memory_region_write_accessor>, 
opaque=0x30d0f5f57d0) at 
/home/ports/pobj/qemu-1.3.0-debug/qemu-1.3.0/memory.c:364
          access_mask = 255
          access_size = 1
          i = 0
  #8  0x0000030b0d5c3222 in memory_region_iorange_write (iorange=0x30d1d5e7400, 
offset=0, width=1, data=8)
      at /home/ports/pobj/qemu-1.3.0-debug/qemu-1.3.0/memory.c:439
          mrio = (MemoryRegionIORange *) 0x30d1d5e7400
          mr = (MemoryRegion *) 0x30d0f5f57d0
          __func__ = "memory_region_iorange_write"
  #9  0x0000030b0d5c019a in ioport_writeb_thunk (opaque=0x30d1d5e7400, 
addr=49216, data=8) at /home/ports/pobj/qemu-1.3.0-debug/qemu-1.3.0/ioport.c:212
          ioport = (IORange *) 0x30d1d5e7400
  #10 0x0000030b0d5bfb65 in ioport_write (index=0, address=49216, data=8) at 
/home/ports/pobj/qemu-1.3.0-debug/qemu-1.3.0/ioport.c:83
          func = (IOPortWriteFunc *) 0x30b0d5c0148 <ioport_writeb_thunk>
          default_func = {0x30b0d5bfbbc <default_ioport_writeb>, 0x30b0d5bfc61 
<default_ioport_writew>, 0x30b0d5bfd0c <default_ioport_writel>}
  #11 0x0000030b0d5c0704 in cpu_outb (addr=49216, val=8 '\b') at 
/home/ports/pobj/qemu-1.3.0-debug/qemu-1.3.0/ioport.c:289
  No locals.
  #12 0x0000030b0d6067dd in helper_outb (port=49216, data=8) at 
/home/ports/pobj/qemu-1.3.0-debug/qemu-1.3.0/target-i386/misc_helper.c:72
  No locals.

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