Hello! I was puzzled by strange fact my qemu stopped to boot DVDs I made over years, if I put them in physical drive and try to boot them via qemu. After a lot of digging I found possible reason: wrongly-set block device size on /dev/sr0 And this lead me to https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=619757 and https://bugzilla.kernel.org/show_bug.cgi?id=7805 so I checked if my dmesg had anything related to pktcdvd: dmesg | grep pkt [ 7.681270] pktcdvd: pktcdvd0: writer mapped to sr0 blockdev --getsize64 /dev/sr0 1073741312 pktsetup -d /dev/sr0 pktsetup: Error: Can't tear down packet device '/dev/sr0': Inappropriate ioctl for device blockdev --getsize64 /dev/sr0 4700372992 after this I can boot my DVD fully (before it was failing at mounting squashfs images): qemu-system-x86_64 -enable-kvm -display sdl,gl=on -cdrom /dev/sr0 -m 1G -soundhw es1370 -usbdevice mouse -smp 3 -cpu max uname -a Linux slax 5.1.6-x64 #1 SMP PREEMPT Fri May 31 23:49:35 MSK 2019 x86_64 AMD FX(tm)-4300 Quad-Core Processor AuthenticAMD GNU/Linux Userspace is 32-bit Slackware (mix of many versions). sg_inq /dev/sr0 standard INQUIRY: PQual=0 Device_type=5 RMB=1 LU_CONG=0 version=0x05 [SPC-3] [AERC=0] [TrmTsk=0] NormACA=1 HiSUP=1 Resp_data_format=2 SCCS=0 ACC=0 TPGS=0 3PC=0 Protect=0 [BQue=0] EncServ=0 MultiP=0 [MChngr=0] [ACKREQQ=0] Addr16=0 [RelAdr=0] WBus16=0 Sync=0 [Linked=0] [TranDis=0] CmdQue=0 [SPI: Clocking=0x0 QAS=0 IUS=0] length=96 (0x60) Peripheral device type: cd/dvd Vendor identification: ASUS Product identification: DRW-24D5MT Product revision level: 1.00
