e4072a9a9d
The stack output currently looks like this: 7fffffffffffffff 0000000a00000000 ffffffff81093341 0000000000000046 <0> ffff88003a545fd8 0000000000000000 0000000000000000 00007fffa39769c0 <0> ffff88003e403f58 ffffffff8102fc4c ffff88003e403f58 ffff88003e403f78 The superfluous <0> are caused by recent printk KERN_CONT change. <*> is now ignored in printk unless some text follows the level and even then it still has to be the first in the format message. Note that the log_lvl parameter is now completely ignored in show_stack_log_lvl and the stack is dumped with the default level (like for quite some time already). It behaves the same as the rest of the dump, function traces are dumped in the very same manner. Only Code and maybe some lines are printed with EMERG level. Unfortunately I see no way how to fix this conceptually to have the whole oops/BUG/panic output with the same level, so this removed only the superfluous characters for the time being. Just for illustration: <4>Process kworker/0:0 (pid: 0, threadinfo ffff88003c8a6000, task ffff88003c85c100) <0>Stack: <4> ffffffff818022c0 0000000a00000001 0000000000000001 0000000000000046 <4> ffff88003c8a7fd8 0000000000000001 ffff88003c8a7e58 0000000000000000 <4> ffff88003e503f48 ffffffff8102fc4c ffff88003e503f48 ffff88003e503f68 <0>Call Trace: <0> <IRQ> <4> [<ffffffff8102fc4c>] ? call_softirq+0x1c/0x30 ... <0>Code: 00 01 00 00 65 8b 04 25 80 c5 00 00 c7 45 ... Signed-off-by: Jiri Slaby <jslaby@suse.cz> Cc: jirislaby@gmail.com Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> LKML-Reference: <1287586131-16222-1-git-send-email-jslaby@suse.cz> Signed-off-by: Ingo Molnar <mingo@elte.hu>
152 lines
3.2 KiB
C
152 lines
3.2 KiB
C
/*
|
|
* Copyright (C) 1991, 1992 Linus Torvalds
|
|
* Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs
|
|
*/
|
|
#include <linux/kallsyms.h>
|
|
#include <linux/kprobes.h>
|
|
#include <linux/uaccess.h>
|
|
#include <linux/hardirq.h>
|
|
#include <linux/kdebug.h>
|
|
#include <linux/module.h>
|
|
#include <linux/ptrace.h>
|
|
#include <linux/kexec.h>
|
|
#include <linux/sysfs.h>
|
|
#include <linux/bug.h>
|
|
#include <linux/nmi.h>
|
|
|
|
#include <asm/stacktrace.h>
|
|
|
|
|
|
void dump_trace(struct task_struct *task, struct pt_regs *regs,
|
|
unsigned long *stack, unsigned long bp,
|
|
const struct stacktrace_ops *ops, void *data)
|
|
{
|
|
int graph = 0;
|
|
|
|
if (!task)
|
|
task = current;
|
|
|
|
if (!stack) {
|
|
unsigned long dummy;
|
|
|
|
stack = &dummy;
|
|
if (task && task != current)
|
|
stack = (unsigned long *)task->thread.sp;
|
|
}
|
|
|
|
#ifdef CONFIG_FRAME_POINTER
|
|
if (!bp) {
|
|
if (task == current) {
|
|
/* Grab bp right from our regs */
|
|
get_bp(bp);
|
|
} else {
|
|
/* bp is the last reg pushed by switch_to */
|
|
bp = *(unsigned long *) task->thread.sp;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
for (;;) {
|
|
struct thread_info *context;
|
|
|
|
context = (struct thread_info *)
|
|
((unsigned long)stack & (~(THREAD_SIZE - 1)));
|
|
bp = ops->walk_stack(context, stack, bp, ops, data, NULL, &graph);
|
|
|
|
stack = (unsigned long *)context->previous_esp;
|
|
if (!stack)
|
|
break;
|
|
if (ops->stack(data, "IRQ") < 0)
|
|
break;
|
|
touch_nmi_watchdog();
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(dump_trace);
|
|
|
|
void
|
|
show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,
|
|
unsigned long *sp, unsigned long bp, char *log_lvl)
|
|
{
|
|
unsigned long *stack;
|
|
int i;
|
|
|
|
if (sp == NULL) {
|
|
if (task)
|
|
sp = (unsigned long *)task->thread.sp;
|
|
else
|
|
sp = (unsigned long *)&sp;
|
|
}
|
|
|
|
stack = sp;
|
|
for (i = 0; i < kstack_depth_to_print; i++) {
|
|
if (kstack_end(stack))
|
|
break;
|
|
if (i && ((i % STACKSLOTS_PER_LINE) == 0))
|
|
printk(KERN_CONT "\n");
|
|
printk(KERN_CONT " %08lx", *stack++);
|
|
touch_nmi_watchdog();
|
|
}
|
|
printk(KERN_CONT "\n");
|
|
show_trace_log_lvl(task, regs, sp, bp, log_lvl);
|
|
}
|
|
|
|
|
|
void show_registers(struct pt_regs *regs)
|
|
{
|
|
int i;
|
|
|
|
print_modules();
|
|
__show_regs(regs, 0);
|
|
|
|
printk(KERN_EMERG "Process %.*s (pid: %d, ti=%p task=%p task.ti=%p)\n",
|
|
TASK_COMM_LEN, current->comm, task_pid_nr(current),
|
|
current_thread_info(), current, task_thread_info(current));
|
|
/*
|
|
* When in-kernel, we also print out the stack and code at the
|
|
* time of the fault..
|
|
*/
|
|
if (!user_mode_vm(regs)) {
|
|
unsigned int code_prologue = code_bytes * 43 / 64;
|
|
unsigned int code_len = code_bytes;
|
|
unsigned char c;
|
|
u8 *ip;
|
|
|
|
printk(KERN_EMERG "Stack:\n");
|
|
show_stack_log_lvl(NULL, regs, ®s->sp,
|
|
0, KERN_EMERG);
|
|
|
|
printk(KERN_EMERG "Code: ");
|
|
|
|
ip = (u8 *)regs->ip - code_prologue;
|
|
if (ip < (u8 *)PAGE_OFFSET || probe_kernel_address(ip, c)) {
|
|
/* try starting at IP */
|
|
ip = (u8 *)regs->ip;
|
|
code_len = code_len - code_prologue + 1;
|
|
}
|
|
for (i = 0; i < code_len; i++, ip++) {
|
|
if (ip < (u8 *)PAGE_OFFSET ||
|
|
probe_kernel_address(ip, c)) {
|
|
printk(" Bad EIP value.");
|
|
break;
|
|
}
|
|
if (ip == (u8 *)regs->ip)
|
|
printk("<%02x> ", c);
|
|
else
|
|
printk("%02x ", c);
|
|
}
|
|
}
|
|
printk("\n");
|
|
}
|
|
|
|
int is_valid_bugaddr(unsigned long ip)
|
|
{
|
|
unsigned short ud2;
|
|
|
|
if (ip < PAGE_OFFSET)
|
|
return 0;
|
|
if (probe_kernel_address((unsigned short *)ip, ud2))
|
|
return 0;
|
|
|
|
return ud2 == 0x0b0f;
|
|
}
|