redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

ARC: stack unwinding: don't assume non-current task is sleeping 

[ Upstream commit e42404fa10 ]

To start stack unwinding (SP, PC and BLINK) are needed. When the
explicit execution context (pt_regs etc) is not available, unwinder
assumes the task is sleeping (in __switch_to()) and fetches SP and BLINK
from kernel mode stack.

But this assumption is not true, specially in a SMP system, when top
runs on 1 core, there may be active running processes on all cores.

So when unwinding non courrent tasks, ensure they are NOT running.

And while at it, handle the self unwinding case explicitly.

This came out of investigation of a customer reported hang with
rcutorture+top

Link: https://github.com/foss-for-synopsys-dwc-arc-processors/linux/issues/31
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
Vineet Gupta 2020-11-06 16:59:27 -08:00 committed by Greg Kroah-Hartman
parent 8ed74a0122
commit b184e98008
1 changed files with 15 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
arch/arc/kernel/stacktrace.c
View File

@ -38,15 +38,15 @@
#ifdef CONFIG_ARC_DW2_UNWIND
static void seed_unwind_frame_info(struct task_struct *tsk,
struct pt_regs *regs,
struct unwind_frame_info *frame_info)
static int
seed_unwind_frame_info(struct task_struct *tsk, struct pt_regs *regs,
struct unwind_frame_info *frame_info)
{
/*
* synchronous unwinding (e.g. dump_stack)
* - uses current values of SP and friends
*/
if (tsk == NULL && regs == NULL) {
if (regs == NULL && (tsk == NULL || tsk == current)) {
unsigned long fp, sp, blink, ret;
frame_info->task = current;
@ -65,11 +65,15 @@ static void seed_unwind_frame_info(struct task_struct *tsk,
frame_info->call_frame = 0;
} else if (regs == NULL) {
/*
* Asynchronous unwinding of sleeping task
* - Gets SP etc from task's pt_regs (saved bottom of kernel
* mode stack of task)
* Asynchronous unwinding of a likely sleeping task
* - first ensure it is actually sleeping
* - if so, it will be in __switch_to, kernel mode SP of task
* is safe-kept and BLINK at a well known location in there
*/
if (tsk->state == TASK_RUNNING)
return -1;
frame_info->task = tsk;
frame_info->regs.r27 = TSK_K_FP(tsk);
@ -103,6 +107,8 @@ static void seed_unwind_frame_info(struct task_struct *tsk,
frame_info->regs.r63 = regs->ret;
frame_info->call_frame = 0;
}
return 0;
}
#endif
@ -116,7 +122,8 @@ arc_unwind_core(struct task_struct *tsk, struct pt_regs *regs,
unsigned int address;
struct unwind_frame_info frame_info;
seed_unwind_frame_info(tsk, regs, &frame_info);
if (seed_unwind_frame_info(tsk, regs, &frame_info))
return 0;
while (1) {
address = UNW_PC(&frame_info);