[Qemu-devel] iscsi / block segfault regression

[Peter Lieven]

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