Re: [Qemu-devel] [PATCH] coroutine: add ./configure --disable-coroutine-pool

[Stefan Hajnoczi <stefanha@redhat.com>]

On Tue, Oct 01, 2013 at 06:44:54PM +0200, Stefan Weil wrote:
> Am 01.10.2013 09:29, schrieb Gabriel Kerneis:
> > On Tue, Oct 01, 2013 at 07:51:24AM +0200, Stefan Weil wrote:
> >> $ wine i386-softmmu/qemu-system-i386 -L pc-bios -cdrom /var/tmp/mini.iso
> >> -sdl # or -vnc :1
> >>
> >> => Assertion in qemu-coroutine-lock.c:99.
> > Could you please provide the backtrace for this?  I am curious which of the uses
> > of qemu_co_queue_restart_all() fails.  I wonder if it is a bug in the
> > implementation of qemu_in_coroutine() on your platform, or really a rare
> > interleaving which exhibits a bug in the logic of coroutine functions.
> >
> 
> Here is a GDB protocol. Build environment:
> 
> Windows 7 (64 bit) host
> MinGW toolchain (not MinGW-w64 which I usually prefer)
> ./configure && make
> 
> $ gdb --args bin/ndebug/mingw32/i386-softmmu/qemu-system-i386 -L pc-bios
> -cdrom mini.iso
> GNU gdb (GDB) 7.5
> Copyright (C) 2012 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later
> <http://gnu.org/licenses/gpl.html>
> This is free software: you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
> and "show warranty" for details.
> This GDB was configured as "i686-pc-mingw32".
> For bug reporting instructions, please see:
> <http://www.gnu.org/software/gdb/bugs/>...
> Reading symbols from
> c:\home\stefan\src\qemu\qemu.org\qemu\bin\ndebug\mingw32\i386-softmmu\qemu-system-i386.exe...done.
> (gdb) b abort
> Breakpoint 1 at 0x6b0070
> (gdb) r
> Starting program:
> c:\home\stefan\src\qemu\qemu.org\qemu\bin\ndebug\mingw32\i386-softmmu\qemu-system-i386.exe
> -L pc-bios -cdrom mini.iso
> [New Thread 4120.0x19c4]
> [New Thread 4120.0x1724]
> [New Thread 4120.0x1a98]
> [New Thread 4120.0x1854]
> [New Thread 4120.0x1bf8]
> VNC server running on `::1:5900'
> Assertion failed: qemu_in_coroutine(), file
> c:/home/stefan/src/qemu/qemu.org/qemu/qemu-coroutine-lock.c, line 99
> [Switching to Thread 4120.0x1a98]
> 
> Breakpoint 1, 0x76118e76 in msvcrt!abort ()
>    from C:\Windows\syswow64\msvcrt.dll
> (gdb) i s
> #0  0x76118e76 in msvcrt!abort () from C:\Windows\syswow64\msvcrt.dll
> #1  0x7611680c in msvcrt!_assert () from C:\Windows\syswow64\msvcrt.dll
> #2  0x00518f2d in qemu_co_queue_restart_all (queue=queue@entry=0x6d3fe90)
>     at c:/home/stefan/src/qemu/qemu.org/qemu/qemu-coroutine-lock.c:99
> #3  0x0040ee81 in tracked_request_end (req=0x6d3fe6c)
>     at c:/home/stefan/src/qemu/qemu.org/qemu/block.c:1963
> #4  bdrv_co_do_readv (bs=0x3057658, sector_num=<optimized out>,
> nb_sectors=4,
>     qiov=0x733f9d0, flags=<optimized out>)
>     at c:/home/stefan/src/qemu/qemu.org/qemu/block.c:2675
> #5  0x0040ee52 in bdrv_co_do_readv (bs=0x3055c10, sector_num=<optimized
> out>,
>     nb_sectors=4, qiov=0x733f9d0, flags=<optimized out>)
>     at c:/home/stefan/src/qemu/qemu.org/qemu/block.c:2645
> #6  0x0040ffbc in bdrv_rw_co_entry (opaque=0x733f968)
>     at c:/home/stefan/src/qemu/qemu.org/qemu/block.c:2276
> #7  0x00441be8 in coroutine_trampoline (co_=0x3058958)
>     at c:/home/stefan/src/qemu/qemu.org/qemu/coroutine-win32.c:57
> #8  0x7549bfa2 in KERNEL32!GetQueuedCompletionStatus ()
>    from C:\Windows\syswow64\kernel32.dll
> #9  0x03058958 in ?? ()
> #10 0x7549bf5a in KERNEL32!GetQueuedCompletionStatus ()
>    from C:\Windows\syswow64\kernel32.dll
> #11 0x014feff0 in ?? ()

This is an interesting backtrace.  The 'current' thread-local variable
from coroutine-win32.c is NULL or doesn't have a caller assigned.

Please post 'thread apply all bt' so we can identify the other threads.

Stefan