Every time we are getting this errors in /var/log/messages , Please any one suggest me for troubleshooting.

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Feb 18 01:55:58 VB kernel: INFO: task tldd:17041 blocked for more than 120 seconds.
Feb 18 01:55:58 VB kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Feb 18 01:55:58 VBHernel: tldd D ffffffff801546d1 0 17041 6553 (NOTLB)
Feb 18 01:55:58 V kernel: ffff81066ccc3d18 0000000000000086 ffff810c7df4a6b0 ffff81066ccc3dc8
Feb 18 01:55:58 VB kernel: 0000000000000001 0000000000000009 ffff810a1509c100 ffff81012be7a100
Feb 18 01:55:58 V kernel: 000254b984c3a6a4 0000000000003009 ffff810a1509c2e8 0000000579b77030
Feb 18 01:55:58 V kernel: Call Trace:
Feb 18 01:55:58 V kernel: [] default_wake_function+0x0/0xe
Feb 18 01:55:58 V kernel: [] wait_for_completion+0x79/0xa2
Feb 18 01:55:58 V kernel: [] default_wake_function+0x0/0xe
Feb 18 01:55:58 V kernel: [] :st:st_do_scsi+0x1f4/0x221
Feb 18 01:55:58 V kernel: [] :st:do_load_unload+0x98/0x119
Feb 18 01:55:58 V kernel: [] :st:st_ioctl+0xa3a/0xe1f
Feb 18 01:55:58 V kernel: [] do_ioctl+0x55/0x6b
Feb 18 01:55:58 kernel: [] vfs_ioctl+0x457/0x4b9
Feb 18 01:55:58 Vkernel: [] audit_syscall_entry+0x1a8/0x1d3
Feb 18 01:55:59 V9 kernel: [] sys_ioctl+0x59/0x78
Feb 18 01:55:59 V9 kernel: [] tracesys+0xd5/0xe0
Feb 18 01:55:59 Vkernel:

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Jamie Bainbridge's picture Red Hat Guru 7252 points
18 February 2016 5:26 AM

This means that a process called tldd is sending a "load" or "unload" command to a SCSI tape device (st is the tape driver) and tldd is then waiting for that SCSI command to return. This waiting is taking more than 2 minutes, so the kernel logs this message.

Do you have a SCSI tape drive attached to this system?

If so, then look into why the tape drive is taking so long to respond. It may be a hardware problem.

If not, then look into why tldd seems to think that you do have a tape drive.

Google tells me that tldd is a Veritas NetBackup component to interact with robotic tape drives, so perhaps Symantec Support would be able to assist further?

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