printf with blocking disabled

[Johnsons]

Hey!

my Cisco router occasionally prints a strange log like:

%SYS-2-NOBLOCK: printf with blocking disabled

Is this normal? Is my router faulty?

Thanks!

[Daniele Giordano]

Sounds like a bug: CSCsy76185.

Known Affected Releases:

(2)

12.4(4)XD10

12.4T

Known Fixed Releases:

(123)

15.3(3)M

15.3(2)T1

15.3(2)T

15.3(1)T2

15.3(1)T1

15.3(1)T

15.2(4)XB11

15.2(4)M5

15.2(4)M4

15.2(4)M3

15.2(4)M2

15.2(4)M1

15.2(4)JA1

15.2(4)JA

15.2(4)GC

15.2(3)T4

15.2(3)T3

15.2(3)T2

15.2(3)T1

15.2(3)T

15.2(3)GCA1

15.2(3)GCA

15.2(3)GC1

15.2(3)GC

15.2(2)T4

15.2(2)T3

15.2(2)T1

15.2(2)T

15.2(2)JB2

15.2(2)JB

15.2(2)JAX

15.2(2)JA1

15.2(2)JA

15.2(1)T4

15.2(1)T2

15.2(1)T1

15.2(1)T

15.1(4)M7

15.1(4)M6

15.1(4)M5

15.1(4)M4

15.1(4)M3

15.1(4)M2

15.1(4)M1

15.1(4)M

15.1(4)GC1

15.1(3)T4

15.1(3)T3

15.1(3)T2

15.1(3)T1

15.1(3)T

15.1(2)T5

15.1(2)T4

15.1(2)T3

15.1(2)T2

15.1(2)T1

15.1(2)T

15.1(1)XB1

15.1(1)T5

15.1(1)T4

15.1(1)T3

15.1(1)T1

15.1(1)T

15.0(1)XA1

15.0(1)XA

15.0(1)M9

15.0(1)M8

15.0(1)M7

15.0(1)M4

15.0(1)M2

15.0(1)M10

15.0(1)M1

15.0(1)M

12.4(24.6.5)PIL12

12.4(24.6)T8

12.4(24.6)PI11g

12.4(24)YS4

12.4(24)YS3

12.4(24)YS2

12.4(24)YS1

12.4(24)YS

12.4(24)YG2

12.4(24)YG1

12.4(24)YE3e

12.4(24)YE

12.4(24)T9

12.4(24)T8

12.4(24)T7

12.4(24)T6

12.4(24)T5

12.4(24)T4o

12.4(24)T4n

12.4(24)T4m

12.4(24)T4l

12.4(24)T4k

12.4(24)T4j

12.4(24)T3

12.4(24)T2

12.4(24)T10

12.4(24)T1

12.4(24)MDB15

12.4(24)MDB14

12.4(24)MDB13

12.4(24)MDA13

12.4(24)MD

12.4(24)GC1

12.4(22)YE4

12.4(22)YE2

12.4(22)XR3

12.4(22)T5

12.4(22)T4

12.4(22)T3

12.4(22)T2

12.4(22)MDA3

12.4(22)MDA2

12.4(22)MDA1

12.4(20)T4

12.4(20)T3

12.4(20)MR

12.4(15)T17

12.4(15)T16

12.4(15)T14

12.4(4)XD12

Try an IOS upgrade.

Regards.

[Eduardo Battis · Accepted solution]

This is caused by a known bug in older Cisco versions  - https://quickview.cloudapps.cisco.com/quickview/bug/CSCsy76185.

you should try upgrading your router firmware if it bothers you.