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Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
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https://rhn.redhat.com/errata/RHBA-2015-2546.html
Description of problem: Boot rhel7.2 guest with virtio-scsi disk. then execute sg_write_same commands as below inside guest. It cause qemu-kvm-rhev process quit. # sg_write_same --in buf --num=32 --lba=80 /dev/sdb # sg_write_same --in /dev/zero --num=96 --lba=0 /dev/sdb # sg_write_same -U --in /dev/zero --num=16 --lba=0 /dev/sdb # time sg_write_same --in buf --num=65536 --lba=131074 /dev/sdb [Create Linking Work Item] Version-Release number of selected component (if applicable): Host: 3.10.0-300.el7.x86_64 qemu-kvm-rhev-2.3.0-13.el7.x86_64 Guest: RHEL7.2 3.10.0-294.el7.x86_64 rpm： sg3_utils-libs-1.37-5.el7.x86_64 sg3_utils-1.37-5.el7.x86_64 How reproducible: Steps to Reproduce: 1.1. Create a 1G raw image on an XFS file system. # qemu-img create -f raw /home/testthin.img 1G 2.Start qemu /usr/libexec/qemu-kvm -name rhel7.2 -M pc-i440fx-rhel7.2.0,accel=kvm,usb=off,vmport=off -cpu SandyBridge -m 8192 -smp 8 \ -drive file=/home/rhel.img,if=none,id=drive-ide0-0-0,format=raw -device ide-hd,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0,bootindex=1 \ -drive file=/home/testthin.img,if=none,id=drive-data-disk,format=raw,cache=none,aio=native,werror=stop,rerror=stop,discard=on -device virtio-scsi-pci,id=scsi1,bus=pci.0 -device scsi-hd,drive=drive-data-disk,id=data-disk,logical_block_size=4096,bus=scsi1.0 \ -netdev tap,id=hostnet0 -device rtl8139,netdev=hostnet0,id=net0,mac=52:55:00:5c:89:4d,bus=pci.0 \ -device qxl-vga,id=video0,ram_size=67108864,vram_size=67108864,vgamem_mb=16,bus=pci.0 -spice port=5900,disable-ticketing, -monitor stdio 3.Execute the following commands in guest: # yes | head -n2048 > buf # sg_write_same --in buf --num=32 --lba=80 /dev/sdb # sg_write_same --in /dev/zero --num=96 --lba=0 /dev/sdb # sg_write_same -U --in /dev/zero --num=16 --lba=0 /dev/sdb # time sg_write_same --in buf --num=65536 --lba=131074 /dev/sdb Actual results: Guest: after step3. qemu-kvm: block.c:3332: bdrv_aligned_pwritev: Assertion `!qiov || bytes == qiov->size' failed. Aborted (core dumped) Expected results: qemu-kvm-rhev and guest work well Additional info: gdb debug info: (gdb) bt #0 0x00007ffff071a5d7 in raise () from /lib64/libc.so.6 #1 0x00007ffff071bcc8 in abort () from /lib64/libc.so.6 #2 0x00007ffff0713546 in __assert_fail_base () from /lib64/libc.so.6 #3 0x00007ffff07135f2 in __assert_fail () from /lib64/libc.so.6 #4 0x00005555557dd2cb in bdrv_aligned_pwritev (bs=bs@entry=0x555556a2c800, req=req@entry=0x55556439bf00, offset=offset@entry=804790272, bytes=bytes@entry=520192, qiov=0x55555692dd18, flags=0) at block.c:3332 #5 0x00005555557ddcd7 in bdrv_co_do_pwritev (bs=bs@entry=0x555556a2c800, offset=<optimized out>, bytes=520192, qiov=0x55555692dd18, flags=<optimized out>) at block.c:3580 #6 0x00005555557dea17 in bdrv_co_do_writev (flags=<optimized out>, qiov=<optimized out>, nb_sectors=<optimized out>, sector_num=<optimized out>, bs=<optimized out>) at block.c:3604 #7 bdrv_co_do_rw (opaque=0x555557ae68f0) at block.c:4997 #8 0x00005555557e895a in coroutine_trampoline (i0=<optimized out>, i1=<optimized out>) at coroutine-ucontext.c:80 #9 0x00007ffff072c0f0 in ?? () from /lib64/libc.so.6 #10 0x00007fffe61a7ef0 in ?? () #11 0x0000000000000000 in ?? ()