Comment 13 for bug 1681439

Here's a qtest reproducer

cat << EOF | ./i386-softmmu/qemu-system-i386 \
-M pc,accel=qtest -qtest null -nographic -vga qxl -qtest stdio -nodefaults \
-drive if=none,id=drive0,file=null-co://,file.read-zeroes=on,format=raw \
-drive if=none,id=drive1,file=null-co://,file.read-zeroes=on,format=raw \
-device ide-cd,drive=drive0 -device ide-hd,drive=drive1
writel 0x0 0xffffffff
outw 0x171 0x32a
outw 0x176 0x3570
outl 0xcf8 0x80000903
outl 0xcfc 0x4e002700
outl 0xcf8 0x80000920
outb 0xcfc 0x5e
outb 0x58 0xe1
outw 0x57 0x0
EOF

With -trace ide\*:
[I 1594492439.431181] OPENED
8666@1594492439.441003:ide_reset IDEstate 0x557f44953598
8666@1594492439.441084:ide_reset IDEstate 0x557f44953968
8666@1594492439.441407:ide_reset IDEstate 0x557f44953e88
8666@1594492439.441484:ide_reset IDEstate 0x557f44954258
8666@1594492439.442483:ide_reset IDEstate 0x557f44953e88
8666@1594492439.442548:ide_reset IDEstate 0x557f44954258
8666@1594492439.444817:ide_reset IDEstate 0x557f44953598
8666@1594492439.444822:ide_reset IDEstate 0x557f44953968
8666@1594492439.444824:ide_reset IDEstate 0x557f44953e88
8666@1594492439.444825:ide_reset IDEstate 0x557f44954258
[R +0.015229] writel 0x0 0xffffffff
OK
[S +0.015321] OK
[R +0.015328] outw 0x171 0x32a
8666@1594492439.446534:ide_ioport_write IDE PIO wr @ 0x171 (Features); val 0x2a; bus 0x557f44953e00 IDEState 0x557f44953e88
8666@1594492439.446537:ide_ioport_write IDE PIO wr @ 0x172 (Sector Count); val 0x03; bus 0x557f44953e00 IDEState 0x557f44953e88
OK
[S +0.015360] OK
[R +0.015377] outw 0x176 0x3570
8666@1594492439.446561:ide_ioport_write IDE PIO wr @ 0x176 (Device/Head); val 0x70; bus 0x557f44953e00 IDEState 0x557f44953e88
8666@1594492439.446564:ide_ioport_write IDE PIO wr @ 0x177 (Command); val 0x35; bus 0x557f44953e00 IDEState 0x557f44954258
8666@1594492439.446581:ide_exec_cmd IDE exec cmd: bus 0x557f44953e00; state 0x557f44954258; cmd 0x35
OK
[S +0.015404] OK
[R +0.015410] outl 0xcf8 0x80000903
OK
[S +0.015413] OK
[R +0.015429] outl 0xcfc 0x4e002700
OK
[S +0.015555] OK
[R +0.015559] outl 0xcf8 0x80000920
OK
[S +0.015561] OK
[R +0.015563] outb 0xcfc 0x5e
OK
[S +0.015663] OK
[R +0.015667] outb 0x58 0xe1
8666@1594492439.446896:ide_dma_cb IDEState 0x557f44954258; sector_num=1 n=259 cmd=DMA WRITE
OK
[S +0.015801] OK
[R +0.015806] outw 0x57 0x0
8666@1594492439.447006:ide_cancel_dma_sync_remaining draining all remaining requests
qemu-system-i386: /home/alxndr/Development/qemu/hw/ide/core.c:724: void ide_cancel_dma_sync(IDEState *): Assertion `s->bus->dma->aiocb == NULL' failed.
Aborted