diff options
| author | Steven Rostedt <rostedt@goodmis.org> | 2025-07-29 14:23:14 -0400 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2025-07-31 10:20:11 -0400 |
| commit | b3b9cb11aa034cfa9eb880bb9bb3d5aaf732e479 (patch) | |
| tree | e8e7389397f25b47f7f5d62fc22af49e5b2ed579 /kernel/exit.c | |
| parent | 357eda2d745054eb737397368bc9b0f84814b0a5 (diff) | |
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 'kernel/exit.c')
| -rw-r--r-- | kernel/exit.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/exit.c b/kernel/exit.c index bb184a67ac73..1d8c8ac33c4f 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -68,6 +68,7 @@ #include <linux/rethook.h> #include <linux/sysfs.h> #include <linux/user_events.h> +#include <linux/unwind_deferred.h> #include <linux/uaccess.h> #include <linux/pidfs.h> @@ -938,6 +939,7 @@ void __noreturn do_exit(long code) tsk->exit_code = code; taskstats_exit(tsk, group_dead); + unwind_deferred_task_exit(tsk); trace_sched_process_exit(tsk, group_dead); /* |