Arch Linux

Description:
After running k3b some programs hang.
# killall -9 k3b -> the window closes.
but k3b is becoming zombies.
transmission, blkid and other programs using HDD - hang. # killall -9 - does not kill them.

CPU usage is low. Increasing The Load Average 5++ on 2 cores.

sync leads to:
[ 721.177408] INFO: task sync:2725 blocked for more than 120 seconds.
[ 721.177421] Tainted: P O 3.17.2-1-ARCH #1
[ 721.177426] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 721.177431] sync D 0000000000000000 0 2725 2718 0x00000000
[ 721.177441] ffff8800ab5dfd00 0000000000000086 ffff88021f5f4670 00000000000145c0
[ 721.177449] ffff8800ab5dffd8 00000000000145c0 ffffffff8181b500 ffff88021f5f4670
[ 721.177456] ffffffff8129debe ffff8800ab5dfc88 ffff88021f5f002f ffff8800ab5dfc50
[ 721.177463] Call Trace:
[ 721.177479] [<ffffffff8129debe>] ? cfq_activate_request+0x8e/0x200
[ 721.177489] [<ffffffff81153a05>] ? mempool_alloc_slab+0x15/0x20
[ 721.177497] [<ffffffff81153ac1>] ? mempool_alloc+0x61/0x170
[ 721.177505] [<ffffffff81280c0e>] ? ioc_lookup_icq+0x4e/0x80
[ 721.177514] [<ffffffff81276a2d>] ? elv_requeue_request+0x5d/0xa0
[ 721.177522] [<ffffffff81538179>] schedule+0x29/0x70
[ 721.177529] [<ffffffff8153b269>] schedule_timeout+0x1b9/0x240
[ 721.177539] [<ffffffff81279973>] ? __blk_run_queue+0x33/0x40
[ 721.177546] [<ffffffff8127dd8a>] ? blk_queue_bio+0x25a/0x390
[ 721.177553] [<ffffffff81538cef>] wait_for_common+0xcf/0x190
[ 721.177561] [<ffffffff8109b730>] ? wake_up_process+0x50/0x50
[ 721.177568] [<ffffffff81538dcd>] wait_for_completion+0x1d/0x20
[ 721.177575] [<ffffffff81272bcb>] submit_bio_wait+0x6b/0x90
[ 721.177582] [<ffffffff8127f3bd>] blkdev_issue_flush+0x5d/0x90
[ 721.177625] [<ffffffffa01a6a94>] ext4_sync_fs+0x1d4/0x1e0 [ext4]
[ 721.177634] [<ffffffff811f7b20>] ? do_fsync+0x80/0x80
[ 721.177642] [<ffffffff811f7b40>] sync_fs_one_sb+0x20/0x30
[ 721.177650] [<ffffffff811cad02>] iterate_supers+0xb2/0x110
[ 721.177657] [<ffffffff811f7c64>] sys_sync+0x64/0xb0
[ 721.177665] [<ffffffff8153c7a9>] system_call_fastpath+0x16/0x1b

# reboot doesn't work. have to press the reset button.

Additional info:
* package version(s) k3b 1:2.0.3a-1

yesterday a fully updated system. I use fluxbox.