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authorChristian Krinitsin <mail@krinitsin.com>2025-07-03 19:39:53 +0200
committerChristian Krinitsin <mail@krinitsin.com>2025-07-03 19:39:53 +0200
commitdee4dcba78baf712cab403d47d9db319ab7f95d6 (patch)
tree418478faf06786701a56268672f73d6b0b4eb239 /results/classifier/108/debug/1180924
parent4d9e26c0333abd39bdbd039dcdb30ed429c475ba (diff)
downloademulator-bug-study-dee4dcba78baf712cab403d47d9db319ab7f95d6.tar.gz
emulator-bug-study-dee4dcba78baf712cab403d47d9db319ab7f95d6.zip
restructure results
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diff --git a/results/classifier/108/debug/1180924 b/results/classifier/108/debug/1180924
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@@ -1,67 +0,0 @@
-debug: 0.936
-permissions: 0.922
-semantic: 0.912
-other: 0.903
-performance: 0.892
-graphic: 0.882
-device: 0.867
-PID: 0.866
-KVM: 0.858
-vnc: 0.851
-files: 0.833
-boot: 0.833
-socket: 0.756
-network: 0.747
-
-fails to handle a usb serial port with a specific vendorid
-
-If I run qemu-system-i386 with arguments
--usb -usbdevice serial:vendorid=1221:pty
-(this is what the documentation says about how I shoud add a usb device which has a serial port interface and which has a specific vendor id, I used the documentation located here:
-http://qemu.weilnetz.de/qemu-doc.html
-), it says 
-char device redirected to /dev/pts/<something> (label usbserial0)
-qemu-system-i386: -usbdevice serial:vendorid=1221:pty: Property '.vendorid' not found
-Aborted
-and exits. Moreover, if I try to add such a device to a running machine by typing usb_add serial:vendorid=1221:pty in the machine's control terminal (to reach it, I press ctrl-alt-2), qemu also writes 
-char device redirected to /dev/pts/<something> (label usbserial0)
-Aborted
-to the terminal where I run it from and exits. To the quest OS this looks like a power failure which causes all the programs inside the virtual machine to lose their unsaved data.
-I have tested this with qemu-1.5.0-rc2, actually, the issue occured in a similar way since 1.0.1, but did not occur in 0.11.1.
-The issue is reproducible always, even if I don't specify any hard disk in the command line, i. e.
-$ qemu-system-i386 -usb -usbdevice serial:vendorid=1221:pty
-, so I believe it is guest OS -independent.
-
-  Hi,
-
->> (this is what the documentation says about how I shoud add a usb device which has a serial port interface and which has a specific vendor id, I used the documentation located here:
->> http://qemu.weilnetz.de/qemu-doc.html
->> ), it says 
->> char device redirected to /dev/pts/<something> (label usbserial0)
->> qemu-system-i386: -usbdevice serial:vendorid=1221:pty: Property '.vendorid' not found
->> Aborted
-> [...]
-> 
-> Regression; this definitely worked when I wrote docs/qdev-device-use.txt.
-
-> Not a release blocker, since it regressed a long time ago (v0.12).
-
-Guess the docs should be updated, unless someone can come up with a
-reasonable use case for the vendorid + deviceid properties.
-
-cheers,
-  Gerd
-
-
-I think the ability to specify a different vendorid + deviceid can be useful. Suppose there is a USB device such that the specifications are open and officially published, but the driver is proprietary. (As far as I know, this is similar to the situation with ATI video cards, but they are not USB devices.) And I suspect that the driver is buggy (i. e. it does not send the data according to the specifications). I want to figure out where exactly it works incorrectly to submit a bug report to the developer of the driver. Or suppose I have a physical device, but it works a bit incorrectly. I want to figure out where exactly the problem is, in the driver or in the device. Since I am not sure that the device is OK, I don't want to write my own driver and interact with the device, maybe I will damage it even more. In both cases, I can emulate the device according to the specifications, install the driver in a guest system, and then see whether the driver sends correct data or where and when exactly the data are incorrect.
-
-Anyway, I think it is more or less ok if qemu crashes right after it starts due to bad command line parameters (nevertherless, the functionality lost this way could be useful as I explained). But I think IT IS NOT OK WHEN A WORKING VM WITH PROGRAMS INSIDE CRASHES after user enters a bad command in the machine's control terminal, unless the user explicitly requests termination (e. g. enters the q command).
-
-Regressed in commit f29783f72ea77dfbd7ea0c993d62d253d4c4e023.
-
-I've just run into this in a similar circumstance: trying to reverse-engineer a driver for a phone to which I can only connect via Bluetooth. No problem, I can just have it pretend to be a USB device. Except that I can't, because the driver won't recognise it.
-
-The crash has now been fixed here:
-http://git.qemu.org/?p=qemu.git;a=commitdiff;h=aa612b364ecbe1dc
-Please also note that the "-usbdevice serial" syntax is considered as deprecated nowadays - use "-device usb-serial" instead.
-