Il 21/04/2015 12:49, Stefano Stabellini ha scritto:
On Mon, 20 Apr 2015, Fabio Fantoni wrote:
I updated xen and qemu from xen 4.5.0 with its upstream qemu included to xen
4.5.1-pre with qemu upstream from stable-4.5 (changed Config.mk to use
revision "master").
After few minutes I booted windows 7 64 bit domU qemu crash, tried 2 times
with same result.
In the domU's qemu log:
qemu-system-i386: malloc.c:3096: sYSMALLOc: Assertion `(old_top ==
(((mbinptr) (((char *) &((av)->bins[((1) - 1) * 2])) - __builtin_offsetof
(struct malloc_chunk, fd)))) && old_size == 0) || ((unsigned long)
(old_size) >= (unsigned long)((((__builtin_offsetof (struct malloc_chunk,
fd_nextsize))+((2 * (sizeof(size_t))) - 1)) & ~((2 * (sizeof(size_t))) -
1))) && ((old_top)->size & 0x1) && ((unsigned long)old_end & pagemask) ==
0)' failed.
Killing all inferiors
In attachment the full backtrace of qemu crash.
With a fast search after I saw the backtrace I found a probable cause of
regression (I'm not sure):
http://xenbits.xen.org/gitweb/?p=staging/qemu-upstream-4.5-testing.git;a=commit;h=5c3402816aaddb15156c69df73c54abe4e1c76aa
spice: make sure we don't overflow ssd->buf
Added also qemu-devel and spice-devel as cc.
If you need more informations/tests tell me and I'll post them.
Maybe you could try to revert the offending commit
(5c3402816aaddb15156c69df73c54abe4e1c76aa)? Or even better bisect the
crash?
Thanks for your reply.
I reverted to 4.5.0 on dom0 for now on that system because I'm busy
trying to found another problem that cause very bad performance without
errors or nothing in logs :( I don't know if if xen related, kernel
related or other for now.
About this regression with spice I'll do further tests in next days
(probably starting reverting the spice patch in qemu) but any help is
appreciated.
Based on data I have for now is possible that the problem is that qemu
try to allocate other ram or videoram after domU create but with xen is
not possible?
In the spice related patch I saw something about dynamic allocation for
example.
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