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Subject[tip:x86/pti] x86/dumpstack: Print registers for first stack frame
Commit-ID:  3ffdeb1a02be3086f1411a15c5b9c481fa28e21f
Gitweb: https://git.kernel.org/tip/3ffdeb1a02be3086f1411a15c5b9c481fa28e21f
Author: Josh Poimboeuf <jpoimboe@redhat.com>
AuthorDate: Sun, 31 Dec 2017 10:18:07 -0600
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Wed, 3 Jan 2018 16:14:46 +0100

x86/dumpstack: Print registers for first stack frame

In the stack dump code, if the frame after the starting pt_regs is also
a regs frame, the registers don't get printed. Fix that.

Reported-by: Andy Lutomirski <luto@amacapital.net>
Tested-by: Alexander Tsoy <alexander@tsoy.me>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Toralf Förster <toralf.foerster@gmx.de>
Cc: stable@vger.kernel.org
Fixes: 3b3fa11bc700 ("x86/dumpstack: Print any pt_regs found on the stack")
Link: http://lkml.kernel.org/r/396f84491d2f0ef64eda4217a2165f5712f6a115.1514736742.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/kernel/dumpstack.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c
index d0bb176..afbecff 100644
--- a/arch/x86/kernel/dumpstack.c
+++ b/arch/x86/kernel/dumpstack.c
@@ -115,6 +115,7 @@ void show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,

unwind_start(&state, task, regs, stack);
stack = stack ? : get_stack_pointer(task, regs);
+ regs = unwind_get_entry_regs(&state, &partial);

/*
* Iterate through the stacks, starting with the current stack pointer.
@@ -132,7 +133,7 @@ void show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
* - hardirq stack
* - entry stack
*/
- for (regs = NULL; stack; stack = PTR_ALIGN(stack_info.next_sp, sizeof(long))) {
+ for ( ; stack; stack = PTR_ALIGN(stack_info.next_sp, sizeof(long))) {
const char *stack_name;

if (get_stack_info(stack, task, &stack_info, &visit_mask)) {
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