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Bug
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Resolution: Unresolved
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Undefined
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rhel-10.0
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bcc-0.34.0-2.el10
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No
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Moderate
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rhel-kernel-tracing
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23
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26
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0
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False
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False
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None
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None
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Pass
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RegressionOnly
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Unspecified
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Unspecified
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Unspecified
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x86_64
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None
What were you trying to do that didn't work?
I am attempting to monitor I/O operations using different BCC tools such as biosnoop, biotop, biolatency, biolatpcts, and biopattern. However, these commands execute without producing any output.
What is the impact of this issue to you?
We are unable to capture I/O performance data, as the relevant BCC tools are not returning any output.
Please provide the package NVR for which the bug is seen:
# rpm -qa | egrep "kernel-6|bcc" ~~~ kernel-6.12.0-55.18.1.el10_0.x86_64 bcc-tools-0.32.0-1.el10.x86_64 bcc-0.32.0-1.el10.x86_64 python3-bcc-0.32.0-1.el10.noarch ~~~
How reproducible is this bug?:
Always
Steps to reproduce
1. Install the required packages - # dnf install bcc bcc-tools python3-bcc 2. Execute 'bio*' commands to monitor I/O operations # cd /usr/share/bcc/tools # ./biotop -C # ./biosnoop
Expected results
The command should show output as below -
# cd /usr/share/bcc/tools # ./biotop -C ~~~ 13:32:08 loadavg: 5.12 3.97 3.22 7/890 5722 PID COMM D MAJ MIN DISK I/O Kbytes AVGms 5708 dd R 252 0 vda 4278 541704 0.10 585 xfsaild/dm-0 W 252 0 vda 18 169 0.49 0 R 252 0 vda 3 0 2.33 5531 kworker/0:0 W 252 0 vda 1 1 0.43 ~~~ # ./biosnoop ~~~ TIME(s) COMM PID DISK T SECTOR BYTES LAT(ms) 1.341270 kworker 5797 sr0 N -1 8 0.203 2.192947 Cache2 2708 vda WS 26112672 16384 0.399 3.389160 kworker 5797 sr0 N -1 8 0.143 5.437357 kworker 5797 sr0 N -1 8 0.270 5.437891 kworker 1863 vda W 26112600 4096 0.632 ~~~
Actual results
# cd /usr/share/bcc/tools # ./biotop -C ~~~ Tracing... Output every 1 secs. Hit Ctrl-C to end 13:29:11 loadavg: 5.00 3.47 2.93 12/891 5673 PID COMM D MAJ MIN DISK I/O Kbytes AVGms 13:29:12 loadavg: 5.00 3.47 2.93 10/891 5673 PID COMM D MAJ MIN DISK I/O Kbytes AVGms 13:29:13 loadavg: 5.00 3.47 2.93 15/891 5673 PID COMM D MAJ MIN DISK I/O Kbytes AVGms ~~~ # ./biosnoop ~~~ TIME(s) COMM PID DISK T SECTOR BYTES LAT(ms) [No Output] ~~~
- links to
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RHBA-2025:150514 bcc bug fix and enhancement update