[SRU][Q][PATCH 0/1] crash when reading from /sys/kernel/tracing/rv/enabled_monitors (LP: #2131136)

[Edoardo Canepa]

BugLink: https://bugs.launchpad.net/bugs/2131136

[ Impact ]

 * As reported in https://lore.kernel.org/linux-trace-kernel/20250923002004.GA2836051@ax162/,
   commit "rv: Fix wrong type cast in enabled_monitors_next()" introduces a crash when
   accessing the sys node /sys/kernel/tracing/rv/enabled_monitors in Questing.

 * The crash is induced by a a wrong type cast and fixed in upstream commit
   103541e6a5854b08a25e4caa61e990af1009a52e:
   "rv: Fully convert enabled_monitors to use list_head as iterator"

 * The issue was originally detected while running ubuntu_ltp fs:read_all_sys as reported
   in LP#2129834

[ Test Plan ]

 * The issue can be reproduced by reading /sys/kernel/tracing/rv/enabled_monitors
   node: no crash should occur

 * Regression test ubuntu_ltp fs:read_all_sys will trigger the issue: the test
   should be now able to complete

[ Where problems could occur ]

 * Changes only affect the /sys/kernel/tracing/rv facility. It is therefore
   highly unlikely that this change will cause regressions on anything else

[ Other Info ]

 * Patch applies on questing without any conflicts

 * Depends on "rv: Fix wrong type cast in enabled_monitors_next()" https://lkml.org/lkml/2025/8/6/599