From: Xi Kangjie imxikangjie@gmail.com Subject: scripts/gdb/linux/tasks.py: fix get_thread_info
Since kernel 4.9, the thread_info has been moved into task_struct, no longer locates at the bottom of kernel stack.
See c65eacbe290b ("sched/core: Allow putting thread_info into task_struct") and 15f4eae70d36 ("x86: Move thread_info into task_struct").
Before fix: (gdb) set $current = $lx_current() (gdb) p $lx_thread_info($current) $1 = {flags = 1470918301} (gdb) p $current.thread_info $2 = {flags = 2147483648}
After fix: (gdb) p $lx_thread_info($current) $1 = {flags = 2147483648} (gdb) p $current.thread_info $2 = {flags = 2147483648}
Link: http://lkml.kernel.org/r/20180118210159.17223-1-imxikangjie@gmail.com Fixes: 15f4eae70d36 ("x86: Move thread_info into task_struct") Signed-off-by: Xi Kangjie imxikangjie@gmail.com Acked-by: Jan Kiszka jan.kiszka@siemens.com Acked-by: Kieran Bingham kbingham@kernel.org Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---
scripts/gdb/linux/tasks.py | 2 ++ 1 file changed, 2 insertions(+)
diff -puN scripts/gdb/linux/tasks.py~scripts-gdb-fix-get_thread_info scripts/gdb/linux/tasks.py --- a/scripts/gdb/linux/tasks.py~scripts-gdb-fix-get_thread_info +++ a/scripts/gdb/linux/tasks.py @@ -96,6 +96,8 @@ def get_thread_info(task): thread_info_addr = task.address + ia64_task_size thread_info = thread_info_addr.cast(thread_info_ptr_type) else: + if task.type.fields()[0].type == thread_info_type.get_type(): + return task['thread_info'] thread_info = task['stack'].cast(thread_info_ptr_type) return thread_info.dereference()
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