On 03/29/2012 10:44 AM, Terry Barnaby wrote: > On 03/28/2012 12:31 PM, Caterpillar wrote: >> >> >> 2012/3/28 Terry Barnaby <terry1@xxxxxxxxxxx <mailto:terry1@xxxxxxxxxxx>> >> >> On 03/26/2012 09:20 PM, J. Randall Owens wrote: >> > On 03/26/2012 06:05 AM, Terry Barnaby wrote: >> >> Hi, >> >> >> >> I am using the latest F16 kernel: 3.3.0-4.fc16.i686.PAE and am having >> >> problems with a MicroSD card connected to a USB card reader. This has >> >> been working fine until recently (at least in F14 on the same hardware). >> >> >> >> The problem is that "umount" does not appear to be working correctly. >> >> I have an ext3 file system on the card. I can mount it, and I can copy >> >> files to it. However when I use the "umount ..." command it returns >> >> instantly (should sync the files to the card). The system says the card >> >> is unmounted (at least it is not listed with mount, df etc). >> >> >> >> However if I run sync, there is a lot of disk activity to the card ... >> >> >> >> Also if I try and run "mkfs" it says the device in in use ... >> >> If I mount a blank card it lists the files present on the previous card ... >> >> >> >> This sounds like a nasty kernel bug ... >> >> Anyone else seen this ? >> > >> > I thought I'd noticed something like this with 3.2.x kernels also; I >> > couldn't narrow it down more than that. In my case, it's a USB external >> > HDD. After unmounting, I have an old habit of running 3 syncs in one >> > line. And lately, I've noticed that I don't even get that disk activity >> > until I give it a second trio of syncs, which certainly doesn't seem right. >> > Let me check right now with 3.3.0-4... Odd, now I do get the activity >> > at about the same time as the umount, and no further activity when I >> > issue the syncs. Seems to be the opposite of what you've reported. >> > >> Kernel 3.2.10-3.fc16.i686.PAE also appears to be broken. >> This seems really very nasty, does it apply to other disks or just to USB >> ones ... >> I have added Bugzilla bug: 806909 for this. >> >> https://bugzilla.redhat.com/show_bug.cgi?id=806909 >> >> Cheers >> >> >> Terry >> -- >> devel mailing list >> devel@xxxxxxxxxxxxxxxxxxxxxxx <mailto:devel@xxxxxxxxxxxxxxxxxxxxxxx> >> https://admin.fedoraproject.org/mailman/listinfo/devel >> >> I just commented your bugreport with mine that submitted some months ago >> >> > For people following this, it appears that if the cups printer daemon is > running then umount fails on USB disks. > > How on earth the cups daemon can affect disk data storage unmounts is > baffling to me. Data storage is sacrosanct, how can the Linux kernel allow > this to happen ? > > Cheers > > > Terry Just a warning to all, this bug is still present. If the cupsd is running and you "umount" a USB disk, then the disk will not be properly unmounted and any written data will not have been synced. A pretty major bug that is still there ... -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel
