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Date: Wed, 23 Aug 2006 23:55:16 +0200
From: Stefan Weil <weil@mail.berlios.de>
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Subject: Re: [Qemu-devel] glibc abort if -snapshot is used
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To: qemu-devel@nongnu.org

Andrew Barr schrieb:
> glibc is 2.3.6-ds1-2 from Debian sid. QEMU was compiled with GCC 3.4.6
> also from Debian.

Hi Andrew,

I get the same error message when a raw disk image cannot be accessed:

$ ./i386-softmmu/qemu -snapshot -m 256 /dev/hda
Could not configure '/dev/rtc' to have a 1024 Hz timer. This is not a fatal
error, but for better emulation accuracy either use a 2.6 host Linux
kernel or
type 'echo 1024 > /proc/sys/dev/rtc/max-user-freq' as root.
*** glibc detected *** double free or corruption (fasttop): 0x09b29120 ***
Abgebrochen

With read access to /dev/hda, everything works fine.

My libc is Debian libc6-2.3.6-15, and the abort message is correct:
QEMU CVS head frees the same memory (bs->opaque in bdrv_close) 2 times.
Older versions of QEMU did not have this bug:

$ qemu -snapshot -m 256 /dev/hda
qemu: could not open hard disk image '/dev/hda'

Regards
Stefan