[Crash-utility] Fix irq_stack_size on ARM64
When using the crash tool to parse the ARM64 dump file with KASAN enabled, I found that
using the bt -a command will cause this tool to crash, the following is the backtrace
infomation.
(gdb) bt
#0 0x00005635ac2b166b in arm64_unwind_frame (frame=0x7ffdaf35cb70, bt=0x7ffdaf35d430)
at arm64.c:2821
#1 arm64_back_trace_cmd (bt=0x7ffdaf35d430) at arm64.c:3306
#2 0x00005635ac27b108 in back_trace (bt=bt@entry=0x7ffdaf35d430) at kernel.c:3239
#3 0x00005635ac2880ae in cmd_bt () at kernel.c:2863
#4 0x00005635ac1f16dc in exec_command () at main.c:893
#5 0x00005635ac1f192a in main_loop () at main.c:840
#6 0x00005635ac50df81 in captured_main (data=<optimized out>) at main.c:1284
#7 gdb_main (args=<optimized out>) at main.c:1313
#8 0x00005635ac50e000 in gdb_main_entry (argc=<optimized out>, argv=<optimized
out>)
at main.c:1338
#9 0x00005635ac1ea2a5 in main (argc=5, argv=0x7ffdaf35dde8) at main.c:721
Eventually, I found that it was may caused by not setting irq_stack_size properly, and
provide this patch to solve it.
From 34b28aa8c11e77d20adec4f7705a14d239c8a55f Mon Sep 17 00:00:00 2001
From: wonderzyp <wonderzyp(a)qq.com>
Date: Mon, 8 Jul 2024 20:11:38 +0800
Subject: [PATCH 1131/1131] set_arm64_irq_stack_size
Signed-off-by: Yeping Zheng <wonderzyp(a)gmail.com>
---
arm64.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 47 insertions(+), 2 deletions(-)
diff --git a/arm64.c b/arm64.c
index b3040d7..39d891b 100644
--- a/arm64.c
+++ b/arm64.c
@@ -93,6 +93,7 @@ static void arm64_calc_VA_BITS(void);
static int arm64_is_uvaddr(ulong, struct task_context *);
static void arm64_calc_KERNELPACMASK(void);
static int arm64_get_vmcoreinfo(unsigned long *vaddr, const char *label, int base);
+static ulong arm64_set_irq_stack_size(struct machine_specific *ms);
struct kernel_range {
unsigned long modules_vaddr, modules_end;
@@ -2223,8 +2224,14 @@ arm64_irq_stack_init(void)
if (MEMBER_EXISTS("thread_union", "stack")) {
if ((sz = MEMBER_SIZE("thread_union",
"stack")) > 0)
ms->irq_stack_size = sz;
- } else
- ms->irq_stack_size = ARM64_IRQ_STACK_SIZE;
+ } else {
+ ulong res = arm64_set_irq_stack_size(ms);
+ if (res > 0){
+ ms->irq_stack_size = res;
+ } else {
+ ms->irq_stack_size = ARM64_IRQ_STACK_SIZE;
+ }
+ }
machdep->flags |= IRQ_STACKS;
@@ -4921,6 +4928,44 @@ static void arm64_calc_KERNELPACMASK(void)
}
}
+static ulong arm64_set_irq_stack_size(struct machine_specific *ms)
+{
+ char *string;
+ int ret;
+ int KASAN_THREAD_SHIFT = 0;
+ int MIN_THREAD_SHIFT;
+ ulong ARM64_PAGE_SHIFT;
+ ulong THREAD_SHIFT = 0;
+ ulong THREAD_SIZE;
+ if (kt->ikconfig_flags & IKCONFIG_AVAIL) {
+ if ((ret = get_kernel_config("CONFIG_KASAN_GENERIC", NULL) ==
IKCONFIG_Y) ||
+ (ret = get_kernel_config("CONFIG_KASAN_SW_TAGS", NULL)
== IKCONFIG_Y)) {
+ KASAN_THREAD_SHIFT = 1;
+ }
+ }
+ MIN_THREAD_SHIFT = 14 + KASAN_THREAD_SHIFT;
+
+ if (kt->ikconfig_flags & IKCONFIG_AVAIL) {
+ if ((ret = get_kernel_config("CONFIG_VMAP_STACK", NULL)) ==
IKCONFIG_Y){
+ if ((ret = get_kernel_config("CONFIG_ARM64_PAGE_SHIFT",
&string)) == IKCONFIG_STR){
+ ARM64_PAGE_SHIFT = atol(string);
+ }
+ if (MIN_THREAD_SHIFT < ARM64_PAGE_SHIFT){
+ THREAD_SHIFT = ARM64_PAGE_SHIFT;
+ } else {
+ THREAD_SHIFT = MIN_THREAD_SHIFT;
+ }
+ }
+ }
+
+ if (THREAD_SHIFT == 0) {
+ return -1;
+ }
+
+ THREAD_SIZE = ((1UL) << THREAD_SHIFT);
+ return THREAD_SIZE;
+}
+
#endif /* ARM64 */
--
2.25.1