On 12.05.2014 16:02, Alan Stern wrote: > On Mon, 12 May 2014, poma wrote: > >> ... >>> "initial 64-byte descriptor request timeout" >>> https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/tree/drivers/usb/core/hub.c#n67 >>> https://www.kernel.org/doc/Documentation/kernel-parameters.txt >>> usbcore.initial_descriptor_timeout= >>> & Co. >>> >> >> I made several tests concerning the topic and incidentally found one bug. :) > >> https://bugzilla.redhat.com/show_bug.cgi?id=1096786 >> Unplug the device without unmounting, >> >> ... >> usb 2-1: USB disconnect, device number 2 >> ------------[ cut here ]------------ >> WARNING: CPU: 0 PID: 4692 at fs/sysfs/group.c:216 sysfs_remove_group+0x93/0xa0() >> sysfs group ffffffff81cb1300 not found for kobject 'target8:0:0' >> CPU: 0 PID: 4692 Comm: umount Not tainted 3.14.3-200.fc20.x86_64 #1 >> Call Trace: >> [<ffffffff816ef242>] dump_stack+0x45/0x56 >> [<ffffffff8108a1bd>] warn_slowpath_common+0x7d/0xa0 >> [<ffffffff8108a23c>] warn_slowpath_fmt+0x5c/0x80 >> [<ffffffff81265598>] ? kernfs_find_and_get_ns+0x48/0x60 >> [<ffffffff81264233>] sysfs_remove_group+0x93/0xa0 >> [<ffffffff8146b543>] dpm_sysfs_remove+0x43/0x50 >> [<ffffffff81460b35>] device_del+0x45/0x1c0 >> [<ffffffff8148deb7>] scsi_target_reap_usercontext+0x27/0x40 >> [<ffffffff810a4e67>] execute_in_process_context+0x67/0x70 >> [<ffffffff8148f334>] scsi_target_reap+0xc4/0xf0 >> [<ffffffff81491366>] scsi_device_dev_release_usercontext+0xe6/0x120 >> [<ffffffff810a4e67>] execute_in_process_context+0x67/0x70 >> [<ffffffff8149127c>] scsi_device_dev_release+0x1c/0x20 >> [<ffffffff814600e2>] device_release+0x32/0xa0 >> [<ffffffff813560a7>] kobject_cleanup+0x77/0x1b0 >> [<ffffffff81355f60>] kobject_put+0x30/0x60 >> [<ffffffff81460407>] put_device+0x17/0x20 >> [<ffffffff8148268b>] scsi_device_put+0x3b/0x50 >> [<ffffffff81495e50>] scsi_disk_put+0x30/0x50 >> [<ffffffff814961b2>] sd_release+0x42/0xd0 >> [<ffffffff8122489c>] __blkdev_put+0x16c/0x1a0 >> [<ffffffff8122483e>] __blkdev_put+0x10e/0x1a0 >> [<ffffffff8122521c>] blkdev_put+0x4c/0x120 >> [<ffffffff811ebd64>] kill_block_super+0x44/0x70 >> [<ffffffff811ec06d>] deactivate_locked_super+0x3d/0x60 >> [<ffffffff811ec636>] deactivate_super+0x46/0x60 >> [<ffffffff81208dac>] mntput_no_expire+0xac/0x140 >> [<ffffffff8120a37d>] SyS_umount+0x9d/0x110 >> [<ffffffff816ff5e9>] system_call_fastpath+0x16/0x1b >> ---[ end trace 6a4cda17930756e9 ]--- >> >> BTW 3.15.0-0.rc5.git0.1.fc21.x86_64 doesn't have this bug. > > This is a known bug, as you can tell from the fact that it has already > been fixed. (And, as you can tell by looking at the stack dump, the > bug was in the SCSI layer rather than the USB layer.) > > Alan Stern > Ooh yeah! But only for 3.15! https://bugzilla.kernel.org/show_bug.cgi?id=69441 https://bugzilla.redhat.com/show_bug.cgi?id=1030988 Is there anything that isn't SCSI emulation? :) poma -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
