[PATCH 0/2] x86 unwind fixes (1 unwinder fix, 1 missing entry ORC annotation)

[Jann Horn]

While doing some kernel development, I managed to cause a recursive #PF
ending in a #DF, as one does... Thanks Andy for adding guard stacks and
such nice error handling for them years ago.

Unfortunately, instead of a nice stack trace, I just got a pile of guess
unwind lines, caused by two bugs.

Here are fixes I came up with for these issues. The issues were
introduced in 2018 and 2023 - if nobody else noticed them since then,
I guess the fixes aren't particularly urgent.

To: Andy Lutomirski <luto@xxxxxxxxxx>

Cc: Dominik Brodowski <linux@xxxxxxxxxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>

To: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
To: Peter Zijlstra <peterz@xxxxxxxxxxxxx>

Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Vernon Lovejoy <vlovejoy@xxxxxxxxxx>

Signed-off-by: Jann Horn <jannh@xxxxxxxxxx>
---
Jann Horn (2):
      x86/entry: Fix ORC for PUSH_REGS with save_ret=1
      x86/dumpstack: Fix broken unwinding from exception stacks

 arch/x86/entry/calling.h    | 2 ++
 arch/x86/kernel/dumpstack.c | 5 ++---
 2 files changed, 4 insertions(+), 3 deletions(-)
---
base-commit: bcb044256d3f5d9f5bb61d1eac6492f77883bd60
change-id: 20250325-2025-03-unwind-fixes-a367c54be822

-- 
Jann Horn <jannh@xxxxxxxxxx>