Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 4749ffdf authored by Vineet Gupta's avatar Vineet Gupta Committed by Greg Kroah-Hartman
Browse files

ARC: show_regs: lockdep: avoid page allocator... 



[ Upstream commit ab6c03676cb190156603cf4c5ecf97aa406c9c53 ]

and use smaller/on-stack buffer instead

The motivation for this change was lockdep splat like below.

| potentially unexpected fatal signal 11.
| BUG: sleeping function called from invalid context at ../mm/page_alloc.c:4317
| in_atomic(): 1, irqs_disabled(): 0, pid: 57, name: segv
| no locks held by segv/57.
| Preemption disabled at:
| [<8182f17e>] get_signal+0x4a6/0x7c4
| CPU: 0 PID: 57 Comm: segv Not tainted 4.17.0+ #23
|
| Stack Trace:
|  arc_unwind_core.constprop.1+0xd0/0xf4
|  __might_sleep+0x1f6/0x234
|  __get_free_pages+0x174/0xca0
|  show_regs+0x22/0x330
|  get_signal+0x4ac/0x7c4     # print_fatal_signals() -> preempt_disable()
|  do_signal+0x30/0x224
|  resume_user_mode_begin+0x90/0xd8

So signal handling core calls show_regs() with preemption disabled but
an ensuing GFP_KERNEL page allocator call is flagged by lockdep.

We could have switched to GFP_NOWAIT, but turns out that is not enough
anways and eliding page allocator call leads to less code and
instruction traces to sift thru when debugging pesky crashes.

FWIW, this patch doesn't cure the lockdep splat (which next patch does).

Reviewed-by: default avatarWilliam Kucharski <william.kucharski@oracle.com>
Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent 4e34dd37

arch/arc/kernel/troubleshoot.c

+12 −14
Original line number Diff line number Diff line
@@ -18,6 +18,8 @@ 
#include <asm/arcregs.h>

#include <asm/irqflags.h>



#define ARC_PATH_MAX	256



/*

 * Common routine to print scratch regs (r0-r12) or callee regs (r13-r25)

 *   -Prints 3 regs per line and a CR.
@@ -58,11 +60,12 @@ static void show_callee_regs(struct callee_regs *cregs) 
	print_reg_file(&(cregs->r13), 13);

}



static void print_task_path_n_nm(struct task_struct *tsk, char *buf)

static void print_task_path_n_nm(struct task_struct *tsk)

{

	char *path_nm = NULL;

	struct mm_struct *mm;

	struct file *exe_file;

	char buf[ARC_PATH_MAX];



	mm = get_task_mm(tsk);

	if (!mm)
@@ -72,7 +75,7 @@ static void print_task_path_n_nm(struct task_struct *tsk, char *buf) 
	mmput(mm);



	if (exe_file) {

		path_nm = file_path(exe_file, buf, 255);

		path_nm = file_path(exe_file, buf, ARC_PATH_MAX-1);

		fput(exe_file);

	}
@@ -80,10 +83,9 @@ static void print_task_path_n_nm(struct task_struct *tsk, char *buf) 
	pr_info("Path: %s\n", !IS_ERR(path_nm) ? path_nm : "?");

}



static void show_faulting_vma(unsigned long address, char *buf)

static void show_faulting_vma(unsigned long address)

{

	struct vm_area_struct *vma;

	char *nm = buf;

	struct mm_struct *active_mm = current->active_mm;



	/* can't use print_vma_addr() yet as it doesn't check for
@@ -96,8 +98,11 @@ static void show_faulting_vma(unsigned long address, char *buf) 
	 * if the container VMA is not found

	 */

	if (vma && (vma->vm_start <= address)) {

		char buf[ARC_PATH_MAX];

		char *nm = "?";



		if (vma->vm_file) {

			nm = file_path(vma->vm_file, buf, PAGE_SIZE - 1);

			nm = file_path(vma->vm_file, buf, ARC_PATH_MAX-1);

			if (IS_ERR(nm))

				nm = "?";

		}
@@ -173,13 +178,8 @@ void show_regs(struct pt_regs *regs) 
{

	struct task_struct *tsk = current;

	struct callee_regs *cregs;

	char *buf;



	buf = (char *)__get_free_page(GFP_KERNEL);

	if (!buf)

		return;



	print_task_path_n_nm(tsk, buf);

	print_task_path_n_nm(tsk);

	show_regs_print_info(KERN_INFO);



	show_ecr_verbose(regs);
@@ -189,7 +189,7 @@ void show_regs(struct pt_regs *regs) 
		(void *)regs->blink, (void *)regs->ret);



	if (user_mode(regs))

		show_faulting_vma(regs->ret, buf); /* faulting code, not data */

		show_faulting_vma(regs->ret); /* faulting code, not data */



	pr_info("[STAT32]: 0x%08lx", regs->status32);
@@ -221,8 +221,6 @@ void show_regs(struct pt_regs *regs) 
	cregs = (struct callee_regs *)current->thread.callee_reg;

	if (cregs)

		show_callee_regs(cregs);



	free_page((unsigned long)buf);

}



void show_kernel_fault_diag(const char *str, struct pt_regs *regs,