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| author | Steven Rostedt <rostedt@goodmis.org> | 2025-07-29 21:23:14 +0300 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2025-07-31 17:20:11 +0300 |
| commit | b3b9cb11aa034cfa9eb880bb9bb3d5aaf732e479 (patch) | |
| tree | e8e7389397f25b47f7f5d62fc22af49e5b2ed579 /include/linux | |
| parent | 357eda2d745054eb737397368bc9b0f84814b0a5 (diff) | |
| download | linux-b3b9cb11aa034cfa9eb880bb9bb3d5aaf732e479.tar.xz | |
unwind: Finish up unwind when a task exits
On do_exit() when a task is exiting, if a unwind is requested and the
deferred user stacktrace is deferred via the task_work, the task_work
callback is called after exit_mm() is called in do_exit(). This means that
the user stack trace will not be retrieved and an empty stack is created.
Instead, add a function unwind_deferred_task_exit() and call it just
before exit_mm() so that the unwinder can call the requested callbacks
with the user space stack.
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Josh Poimboeuf <jpoimboe@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: Indu Bhagat <indu.bhagat@oracle.com>
Cc: "Jose E. Marchesi" <jemarch@gnu.org>
Cc: Beau Belgrave <beaub@linux.microsoft.com>
Cc: Jens Remus <jremus@linux.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Florian Weimer <fweimer@redhat.com>
Cc: Sam James <sam@gentoo.org>
Link: https://lore.kernel.org/20250729182406.504259474@kernel.org
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/unwind_deferred.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/unwind_deferred.h b/include/linux/unwind_deferred.h index 2efbda01e959..26122d00708a 100644 --- a/include/linux/unwind_deferred.h +++ b/include/linux/unwind_deferred.h @@ -39,6 +39,8 @@ int unwind_deferred_init(struct unwind_work *work, unwind_callback_t func); int unwind_deferred_request(struct unwind_work *work, u64 *cookie); void unwind_deferred_cancel(struct unwind_work *work); +void unwind_deferred_task_exit(struct task_struct *task); + static __always_inline void unwind_reset_info(void) { struct unwind_task_info *info = ¤t->unwind_info; @@ -71,6 +73,7 @@ static inline int unwind_deferred_init(struct unwind_work *work, unwind_callback static inline int unwind_deferred_request(struct unwind_work *work, u64 *timestamp) { return -ENOSYS; } static inline void unwind_deferred_cancel(struct unwind_work *work) {} +static inline void unwind_deferred_task_exit(struct task_struct *task) {} static inline void unwind_reset_info(void) {} #endif /* !CONFIG_UNWIND_USER */ |