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From: "Alexei V. Mezin" <alexei-mezin@rambler.ru>
Date: Wed, 31 Aug 2011 23:02:22 +0400
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Имеем сизиф с  3.0.1-std-def-alt1


Пытаюсь через dd на фэшку записать образы с новыми Симпли и КДесктоп (на 
разные флэшки). Через пару минут процесса в dmesg можно обнаружить
sd 8:0:0:0: [sdj] Asking for cache data failed
sd 8:0:0:0: [sdj] Assuming drive cache: write through
sd 8:0:0:0: [sdj] Attached SCSI removable disk
INFO: task atop:23523 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
atop            D 00000001     0 23523      1 0x00000080
  c1a3bafc 00000082 00000008 00000001 c1a3bac4 c11c9825 00000004 dbaaa050
  c15afb80 ed73f300 c15afb80 c15afb80 50abc15a 0000533b c15afb80 f5505b80
  ed73f300 f41c3000 00000002 f5dd1aa0 c1a3bbd4 00000000 c1a3bae8 00000286
Call Trace:
  [<c11c9825>] ? submit_bio+0x65/0xe0
  [<c106d0d2>] ? ktime_get_ts+0xe2/0x110
  [<c1376ff1>] io_schedule+0x71/0xb0
  [<c10cbda8>] sleep_on_page+0x8/0x10
  [<c13776a5>] __wait_on_bit+0x45/0x70
  [<c10cbda0>] ? __lock_page+0x80/0x80
  [<c10cbf26>] wait_on_page_bit+0x86/0x90
  [<c1063760>] ? autoremove_wake_function+0x40/0x40
  [<c10dacc0>] shrink_page_list+0x1e0/0x770
  [<c10db6af>] shrink_inactive_list+0x21f/0x3f0
  [<c10d44ce>] ? global_dirty_limits+0x2e/0xd0
  [<c10dbc22>] shrink_zone+0x3a2/0x5d0
  [<c101bc56>] ? lapic_next_event+0x16/0x20
  [<c10dc799>] do_try_to_free_pages+0xb9/0x3e0
  [<c10dccf5>] try_to_free_pages+0x85/0x100
  [<c10d2940>] __alloc_pages_nodemask+0x3c0/0x6d0
  [<c110b9ad>] ? __mem_cgroup_commit_charge+0x6d/0xd0
  [<c10ebc55>] ? handle_pte_fault+0x405/0x920
  [<c11090bf>] do_huge_pmd_anonymous_page+0x10f/0x320
  [<c102b6c6>] ? kmap_atomic_prot+0xd6/0x100
  [<c10ec312>] handle_mm_fault+0x1a2/0x230
  [<c10ec524>] __get_user_pages+0xe4/0x470
  [<c10ed7a2>] __mlock_vma_pages_range.clone.3+0x62/0x70
  [<c10eda74>] mlock_vma_pages_range+0x84/0x90
  [<c10efba1>] mmap_region+0x251/0x460
  [<c10efff1>] do_mmap_pgoff+0x241/0x320
  [<c10f0132>] sys_mmap_pgoff+0x62/0x1d0
  [<c100c21c>] ? syscall_trace_leave+0x6c/0xc0
  [<c1378d89>] syscall_call+0x7/0xb
INFO: task convert:31159 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
convert         D 00000001     0 31159  30958 0x00000080
....

и так далее.

При этом все тормозит. Но вроде дальше не падает, и флэшка записывается 
нормально. Хотя панели и апплеты КДЕ замерзли и не очнулись.