System hang in blk_mq_freeze_queue_wait() while using EMC PowerPath

Solution Unverified - Updated -

Issue

  • System hang in blk_mq_freeze_queue_wait() while using EMC PowerPath:
PID: 9474   TASK: ffff893237dc1ec0  CPU: 15  COMMAND: "pp_udev.sh"
 #0 [ffffb0f077b6fd30] __schedule at ffffffffbc54a13d
 #1 [ffffb0f077b6fdc0] schedule at ffffffffbc54a618
 #2 [ffffb0f077b6fdd0] blk_mq_freeze_queue_wait at ffffffffbc04c916
 #3 [ffffb0f077b6fe18] elevator_switch at ffffffffbc040712
 #4 [ffffb0f077b6fe30] elv_iosched_store at ffffffffbc0408ec
 #5 [ffffb0f077b6fe68] queue_attr_store at ffffffffbc046a95
 #6 [ffffb0f077b6fe98] kernfs_fop_write at ffffffffbbfae5f6
 #7 [ffffb0f077b6fed0] vfs_write at ffffffffbbf18c95
 #8 [ffffb0f077b6ff00] ksys_write at ffffffffbbf18f0f
 #9 [ffffb0f077b6ff38] do_syscall_64 at ffffffffbbc0420b

Environment

  • Red Hat Enterprise Linux 8

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