git bisect results:
lieven@lieven-pc:~/git/qemu$ git bisect bad
f500a6d3c2b9ef0bb06d0080d91d8ed3c1d68f58 is the first bad commit
commit f500a6d3c2b9ef0bb06d0080d91d8ed3c1d68f58
Author: Kevin Wolf <kw...@redhat.com>
Date: Mon Nov 12 17:35:27 2012 +0100
block: Avoid second open for format probing
This fixes problems that are caused by the additional open/close cycle
of the existing format probing, for example related to qemu-nbd without
-t option or file descriptor passing.
Signed-off-by: Kevin Wolf <kw...@redhat.com>
:100644 100644 c4f5566b5de6cfa371d7b60dd8b0e1a2da7fd55f
2ec3afebfe6a6c12b573cba9ad36de800623fe6a M block.c
On 21.03.2013 11:45, Peter Lieven wrote:
Hi,
I currently try to debug a regression in git master with iscsi that happens
with some iscsi volumes.
I added debugging output to all aio calls into block/iscsi.c and it seems that
immediately after
brdv_open something is overwriting bs->opaque with a new pointer.
~/git/qemu$ x86_64-softmmu/qemu-system-x86_64 -k de -enable-kvm -m 1024 -drive
format=iscsi,file=iscsi://172.21.200.31/iqn.2001-05.com.equallogic:0-8a0906-3c0f4e007-dce91829d0450add-lieven-storage-migration-test-hd0/0,if=virtio,cache=writeback,aio=native
-vnc :1 -boot dc -monitor stdio
iscsi open start
iscsi_full_connect_sync: iscsilun = 140063347224208, iscsilun->iscsi =
140063347225536, bs = 140063347221696,
filename=iscsi://172.21.200.31/iqn.2001-05.com.equallogic:0-8a0906-3c0f4e007-dce91829d0450add-lieven-storage-migration-test-hd0/0
iscsi open finish ret=0
iscsi_aio_flush: iscsilun = 140063347230736, iscsilun->iscsi = 0, bs =
140063347221696,
filename=iscsi://172.21.200.31/iqn.2001-05.com.equallogic:0-8a0906-3c0f4e007-dce91829d0450add-lieven-storage-migration-test-hd0/0
iscsi_aio_flush_acb: iscsilun = 140063347230736, iscsilun->iscsi = 0, bs =
140063347221696,
filename=iscsi://172.21.200.31/iqn.2001-05.com.equallogic:0-8a0906-3c0f4e007-dce91829d0450add-lieven-storage-migration-test-hd0/0
Speicherzugriffsfehler (Speicherabzug geschrieben)
bs address is unchanged, but iscsilun address is changed after connection it
seems to an area with zeroed memory. the pointer to the iscsi context
is thus NULL.
iscsilun, iscsilun->iscsi and bs are addresses.
Peter
