Messages in this thread Patch in this message | | | Date | Wed, 3 Jan 2018 08:23:04 -0800 | From | tip-bot for Josh Poimboeuf <> | Subject | [tip:x86/pti] x86/dumpstack: Print registers for first stack frame |
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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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