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[Qemu-devel] qemu-system-sparc io-thread segfault on win32
From: |
Bob Breuer |
Subject: |
[Qemu-devel] qemu-system-sparc io-thread segfault on win32 |
Date: |
Sun, 16 Oct 2011 23:39:28 -0500 |
User-agent: |
Thunderbird 2.0.0.24 (Windows/20100228) |
I'm getting a segfault from qemu-system-sparc with the io thread enabled
on win32. This is with the latest mingw (gcc 4.6.1). mipsel also
fails, but i386 is ok. I haven't checked any of the other system
targets, but they might also show this problem.
git bisect points to commit cea5f9a cpu-exec.c: avoid AREG0 use, but
that would seem to only expose the bug instead of creating it. In
cpu_exec(), assigning any valid pointer to ebp before setjmp will get it
working again. It looks like a bogus value in ebp at the time of setjmp
will cause longjmp to abort on win32.
Here's some output from gdb for the crash:
Starting program: d:\qemu\build-mingw\sparc-softmmu\qemu-system-sparc.exe
-m 64 -L ./qemu-git/pc-bios
[New Thread 2128.0x664]
[New Thread 2128.0x5d4]
[New Thread 2128.0x6dc]
[Switching to Thread 2128.0x6dc]
Breakpoint 1, 0x00514a30 in _setjmp ()
(gdb) info registers
eax 0x1989b7c 26778492
ecx 0x1982008 26746888
edx 0x0 0
ebx 0x1982008 26746888
esp 0x378fe00 0x378fe00
ebp 0xfffffffe 0xfffffffe
esi 0x0 0
edi 0x1982008 26746888
eip 0x514a30 0x514a30 <_setjmp>
eflags 0x202 [ IF ]
cs 0x1b 27
ss 0x23 35
ds 0x23 35
es 0x23 35
fs 0x38 56
gs 0x0 0
(gdb) c
Continuing.
Program received signal SIGSEGV, Segmentation fault.
0x7800bd65 in abnormal_termination () from C:\WINNT\system32\msvcrt.dll
(gdb) bt
#0 0x7800bd65 in abnormal_termination () from
C:\WINNT\system32\msvcrt.dll
#1 0x0378ffa4 in ?? ()
Backtrace stopped: previous frame inner to this frame (corrupt stack?)
Bob
- [Qemu-devel] qemu-system-sparc io-thread segfault on win32,
Bob Breuer <=
- Message not available
- Re: [Qemu-devel] qemu-system-sparc io-thread segfault on win32, Bob Breuer, 2011/10/17
- Re: [Qemu-devel] gcc auto-omit-frame-pointer vs msvc longjmp, Bob Breuer, 2011/10/17
- Re: [Qemu-devel] gcc auto-omit-frame-pointer vs msvc longjmp, Kai Tietz, 2011/10/17
- Re: [Qemu-devel] gcc auto-omit-frame-pointer vs msvc longjmp, Bob Breuer, 2011/10/17
- Re: [Qemu-devel] gcc auto-omit-frame-pointer vs msvc longjmp, Kai Tietz, 2011/10/17
- Re: [Qemu-devel] gcc auto-omit-frame-pointer vs msvc longjmp, Bob Breuer, 2011/10/19
- Re: [Qemu-devel] gcc auto-omit-frame-pointer vs msvc longjmp, Richard Henderson, 2011/10/19