table of contents
error::inode-uprobes - limitations of inode-uprobes
The uprobes kernel facility introduced in Linux 3.5 aims to supplant the earlier out-of-tree utrace patch to enable user-space probing. There have been some functional limitations in inode-uprobes that preclude some systemtap constructs. Over time, we hope these regressions will be corrected.
- function.return probes
- process.function().return probes require "return-probes" or "uretprobes" functionality, which was not implemented in the builtin inode-uprobes until kernel 3.10. If you cannot upgrade your kernel, consider using process.statement() probes placed on source line numbers at the function's return statements.
- function.statement.absolute probes
- In utrace-equipped kernels, systemtap made it possible to address probes by literal addresses in the process virtual memory address space. The new inode-uprobes does not have this capability.
stap(1), http://kernelnewbies.org/Linux_3.5, http://sourceware.org/systemtap/wiki/utrace, error::reporting(7stap)