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x86, dumpstack: Correct stack dump info when frame pointer is available

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Current stack dump code scans entire stack and check each entry
contains a pointer to kernel code. If CONFIG_FRAME_POINTER=y it
could mark whether the pointer is valid or not based on value of
the frame pointer. Invalid entries could be preceded by '?' sign.

However this was not going to happen because scan start point
was always higher than the frame pointer so that they could not
meet.

Commit 9c0729dc80 ("x86: Eliminate bp argument from the stack
tracing routines") delayed bp acquisition point, so the bp was
read in lower frame, thus all of the entries were marked
invalid.

This patch fixes this by reverting above commit while retaining
stack_frame() helper as suggested by Frederic Weisbecker.

End result looks like below:

before:

 [    3.508329] Call Trace:
 [    3.508551]  [<ffffffff814f35c9>] ? panic+0x91/0x199
 [    3.508662]  [<ffffffff814f3739>] ? printk+0x68/0x6a
 [    3.508770]  [<ffffffff81a981b2>] ? mount_block_root+0x257/0x26e
 [    3.508876]  [<ffffffff81a9821f>] ? mount_root+0x56/0x5a
 [    3.508975]  [<ffffffff81a98393>] ? prepare_namespace+0x170/0x1a9
 [    3.509216]  [<ffffffff81a9772b>] ? kernel_init+0x1d2/0x1e2
 [    3.509335]  [<ffffffff81003894>] ? kernel_thread_helper+0x4/0x10
 [    3.509442]  [<ffffffff814f6880>] ? restore_args+0x0/0x30
 [    3.509542]  [<ffffffff81a97559>] ? kernel_init+0x0/0x1e2
 [    3.509641]  [<ffffffff81003890>] ? kernel_thread_helper+0x0/0x10

after:

 [    3.522991] Call Trace:
 [    3.523351]  [<ffffffff814f35b9>] panic+0x91/0x199
 [    3.523468]  [<ffffffff814f3729>] ? printk+0x68/0x6a
 [    3.523576]  [<ffffffff81a981b2>] mount_block_root+0x257/0x26e
 [    3.523681]  [<ffffffff81a9821f>] mount_root+0x56/0x5a
 [    3.523780]  [<ffffffff81a98393>] prepare_namespace+0x170/0x1a9
 [    3.523885]  [<ffffffff81a9772b>] kernel_init+0x1d2/0x1e2
 [    3.523987]  [<ffffffff81003894>] kernel_thread_helper+0x4/0x10
 [    3.524228]  [<ffffffff814f6880>] ? restore_args+0x0/0x30
 [    3.524345]  [<ffffffff81a97559>] ? kernel_init+0x0/0x1e2
 [    3.524445]  [<ffffffff81003890>] ? kernel_thread_helper+0x0/0x10

 -v5:
   * fix build breakage with oprofile

 -v4:
   * use 0 instead of regs->bp
   * separate out printk changes

 -v3:
   * apply comment from Frederic
   * add a couple of printk fixes

Signed-off-by: Namhyung Kim <namhyung@gmail.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Soren Sandmann <ssp@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Robert Richter <robert.richter@amd.com>
LKML-Reference: <1300416006-3163-1-git-send-email-namhyung@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Namhyung Kim 2011-03-18 11:40:06 +09:00 committed by Ingo Molnar
parent 2c76397bdd
commit e8e999cf3c
9 changed files with 33 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/include/asm/kdebug.h
View File

@ -26,7 +26,7 @@ extern void die(const char *, struct pt_regs *,long);
extern int __must_check __die(const char *, struct pt_regs *, long);
extern void show_registers(struct pt_regs *regs);
extern void show_trace(struct task_struct *t, struct pt_regs *regs,
unsigned long *sp);
unsigned long *sp, unsigned long bp);
extern void __show_regs(struct pt_regs *regs, int all);
extern void show_regs(struct pt_regs *regs);
extern unsigned long oops_begin(void);

6
arch/x86/include/asm/stacktrace.h
View File

@ -47,7 +47,7 @@ struct stacktrace_ops {
};
void dump_trace(struct task_struct *tsk, struct pt_regs *regs,
unsigned long *stack,
unsigned long *stack, unsigned long bp,
const struct stacktrace_ops *ops, void *data);
#ifdef CONFIG_X86_32
@ -86,11 +86,11 @@ stack_frame(struct task_struct *task, struct pt_regs *regs)
extern void
show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
unsigned long *stack, char *log_lvl);
unsigned long *stack, unsigned long bp, char *log_lvl);
extern void
show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,
unsigned long *sp, char *log_lvl);
unsigned long *sp, unsigned long bp, char *log_lvl);
extern unsigned int code_bytes;

2
arch/x86/kernel/cpu/perf_event.c
View File

@ -1792,7 +1792,7 @@ perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs)
perf_callchain_store(entry, regs->ip);
dump_trace(NULL, regs, NULL, &backtrace_ops, entry);
dump_trace(NULL, regs, NULL, 0, &backtrace_ops, entry);
}
#ifdef CONFIG_COMPAT

14
arch/x86/kernel/dumpstack.c
View File

@ -175,21 +175,21 @@ static const struct stacktrace_ops print_trace_ops = {
void
show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
unsigned long *stack, char *log_lvl)
unsigned long *stack, unsigned long bp, char *log_lvl)
{
printk("%sCall Trace:\n", log_lvl);
dump_trace(task, regs, stack, &print_trace_ops, log_lvl);
dump_trace(task, regs, stack, bp, &print_trace_ops, log_lvl);
}
void show_trace(struct task_struct *task, struct pt_regs *regs,
unsigned long *stack)
unsigned long *stack, unsigned long bp)
{
show_trace_log_lvl(task, regs, stack, "");
show_trace_log_lvl(task, regs, stack, bp, "");
}
void show_stack(struct task_struct *task, unsigned long *sp)
{
show_stack_log_lvl(task, NULL, sp, "");
show_stack_log_lvl(task, NULL, sp, 0, "");
}
/*
@ -197,14 +197,16 @@ void show_stack(struct task_struct *task, unsigned long *sp)
*/
void dump_stack(void)
{
unsigned long bp;
unsigned long stack;
bp = stack_frame(current, NULL);
printk("Pid: %d, comm: %.20s %s %s %.*s\n",
current->pid, current->comm, print_tainted(),
init_utsname()->release,
(int)strcspn(init_utsname()->version, " "),
init_utsname()->version);
show_trace(NULL, NULL, &stack);
show_trace(NULL, NULL, &stack, bp);
}
EXPORT_SYMBOL(dump_stack);

15
arch/x86/kernel/dumpstack_32.c
View File

@ -17,12 +17,11 @@
#include <asm/stacktrace.h>
void dump_trace(struct task_struct *task,
struct pt_regs *regs, unsigned long *stack,
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;
unsigned long bp;
if (!task)
task = current;
@ -35,7 +34,9 @@ void dump_trace(struct task_struct *task,
stack = (unsigned long *)task->thread.sp;
}
bp = stack_frame(task, regs);
if (!bp)
bp = stack_frame(task, regs);
for (;;) {
struct thread_info *context;
@ -55,7 +56,7 @@ EXPORT_SYMBOL(dump_trace);
void
show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,
unsigned long *sp, char *log_lvl)
unsigned long *sp, unsigned long bp, char *log_lvl)
{
unsigned long *stack;
int i;
@ -77,7 +78,7 @@ show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,
touch_nmi_watchdog();
}
printk(KERN_CONT "\n");
show_trace_log_lvl(task, regs, sp, log_lvl);
show_trace_log_lvl(task, regs, sp, bp, log_lvl);
}
@ -102,7 +103,7 @@ void show_registers(struct pt_regs *regs)
u8 *ip;
printk(KERN_EMERG "Stack:\n");
show_stack_log_lvl(NULL, regs, &regs->sp, KERN_EMERG);
show_stack_log_lvl(NULL, regs, &regs->sp, 0, KERN_EMERG);
printk(KERN_EMERG "Code: ");

14
arch/x86/kernel/dumpstack_64.c
View File

@ -139,8 +139,8 @@ fixup_bp_irq_link(unsigned long bp, unsigned long *stack,
* severe exception (double fault, nmi, stack fault, debug, mce) hardware stack
*/
void dump_trace(struct task_struct *task,
struct pt_regs *regs, unsigned long *stack,
void dump_trace(struct task_struct *task, struct pt_regs *regs,
unsigned long *stack, unsigned long bp,
const struct stacktrace_ops *ops, void *data)
{
const unsigned cpu = get_cpu();
@ -150,7 +150,6 @@ void dump_trace(struct task_struct *task,
struct thread_info *tinfo;
int graph = 0;
unsigned long dummy;
unsigned long bp;
if (!task)
task = current;
@ -161,7 +160,8 @@ void dump_trace(struct task_struct *task,
stack = (unsigned long *)task->thread.sp;
}
bp = stack_frame(task, regs);
if (!bp)
bp = stack_frame(task, regs);
/*
* Print function call entries in all stacks, starting at the
* current stack address. If the stacks consist of nested
@ -225,7 +225,7 @@ EXPORT_SYMBOL(dump_trace);
void
show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,
unsigned long *sp, char *log_lvl)
unsigned long *sp, unsigned long bp, char *log_lvl)
{
unsigned long *irq_stack_end;
unsigned long *irq_stack;
@ -269,7 +269,7 @@ show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,
preempt_enable();
printk(KERN_CONT "\n");
show_trace_log_lvl(task, regs, sp, log_lvl);
show_trace_log_lvl(task, regs, sp, bp, log_lvl);
}
void show_registers(struct pt_regs *regs)
@ -298,7 +298,7 @@ void show_registers(struct pt_regs *regs)
printk(KERN_EMERG "Stack:\n");
show_stack_log_lvl(NULL, regs, (unsigned long *)sp,
KERN_EMERG);
0, KERN_EMERG);
printk(KERN_EMERG "Code: ");

2
arch/x86/kernel/process.c
View File

@ -87,7 +87,7 @@ void exit_thread(void)
void show_regs(struct pt_regs *regs)
{
show_registers(regs);
show_trace(NULL, regs, (unsigned long *)kernel_stack_pointer(regs));
show_trace(NULL, regs, (unsigned long *)kernel_stack_pointer(regs), 0);
}
void show_regs_common(void)

6
arch/x86/kernel/stacktrace.c
View File

@ -73,7 +73,7 @@ static const struct stacktrace_ops save_stack_ops_nosched = {
*/
void save_stack_trace(struct stack_trace *trace)
{
dump_trace(current, NULL, NULL, &save_stack_ops, trace);
dump_trace(current, NULL, NULL, 0, &save_stack_ops, trace);
if (trace->nr_entries < trace->max_entries)
trace->entries[trace->nr_entries++] = ULONG_MAX;
}
@ -81,14 +81,14 @@ EXPORT_SYMBOL_GPL(save_stack_trace);
void save_stack_trace_regs(struct stack_trace *trace, struct pt_regs *regs)
{
dump_trace(current, regs, NULL, &save_stack_ops, trace);
dump_trace(current, regs, NULL, 0, &save_stack_ops, trace);
if (trace->nr_entries < trace->max_entries)
trace->entries[trace->nr_entries++] = ULONG_MAX;
}
void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
{
dump_trace(tsk, NULL, NULL, &save_stack_ops_nosched, trace);
dump_trace(tsk, NULL, NULL, 0, &save_stack_ops_nosched, trace);
if (trace->nr_entries < trace->max_entries)
trace->entries[trace->nr_entries++] = ULONG_MAX;
}

2
arch/x86/oprofile/backtrace.c
View File

@ -126,7 +126,7 @@ x86_backtrace(struct pt_regs * const regs, unsigned int depth)
if (!user_mode_vm(regs)) {
unsigned long stack = kernel_stack_pointer(regs);
if (depth)
dump_trace(NULL, regs, (unsigned long *)stack,
dump_trace(NULL, regs, (unsigned long *)stack, 0,
&backtrace_ops, &depth);
return;
}