Blocked tasks due to CPU starvation from spinlock contention in pipe waitqueues

Solution Unverified - Updated -

Issue

  • System log shows blocked tasks:
INFO: task updatedb:10673 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
updatedb      D ffffffff80153806     0 10673  10648                     (NOTLB)
 ffff810193747e88 0000000000000082 ffff810193747ea8 ffffffff8000da09
 ffff81025b32a150 000000000000000a ffff8102ff8eb0c0 ffff8101b1f667a0
 0013a734e43702c9 00000000000052d0 ffff8102ff8eb2a8 0000000dffffff9c
Call Trace:
 [<ffffffff8000da09>] permission+0x81/0xc8
 [<ffffffff8002319a>] file_move+0x36/0x44
 [<ffffffff800258ae>] filldir+0x0/0xb7
 [<ffffffff80063c4f>] __mutex_lock_slowpath+0x60/0x9b
 [<ffffffff80063c99>] .text.lock.mutex+0xf/0x14
 [<ffffffff80035379>] vfs_readdir+0x5c/0xa9
 [<ffffffff80038c2d>] sys_getdents+0x75/0xbd
 [<ffffffff8005d229>] tracesys+0x71/0xe0
 [<ffffffff8005d28d>] tracesys+0xd5/0xe0

Environment

  • Red Hat Enterprise Linux 5.6
  • Application using select() system call on pipes

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