The 'funcslower' bcc-tool fails to show the kernel stack frame with the '-K' option

Solution Verified - Updated -

Issue

  • The funcslower bcc-tool fails to show the kernel stack frame with the -K option.
# /usr/share/bcc/tools/funcslower -K "vfs_read"
Tracing function calls slower than 1 ms... Ctrl+C to quit.
COMM           PID    LAT(ms)             RVAL FUNC
ls             333917   10.27              340 vfs_read 
    b'kretprobe_trampoline'
ls             333917    5.71              340 vfs_read 
    b'kretprobe_trampoline'

Environment

  • Red Hat Enterprise Linux 9
  • bcc-tools
  • funcslower

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