[PATCH 00/24] alpha: catch up on architecture Kconfig options · Matt Turner <mattst88@gmail.com> · 2026-09-01
[PATCH 01/24] alpha: fix arch_irqs_disabled_flags() to treat any raised IPL as disabled · Matt Turner <mattst88@gmail.com> · 2026-09-01
Re: [PATCH 01/24] alpha: fix arch_irqs_disabled_flags() to treat any raised IPL as disabled · Magnus Lindholm <linmag7@gmail.com> · 2026-09-01
[PATCH 02/24] alpha: enter hardirq context before looking up the irq descriptor · Matt Turner <mattst88@gmail.com> · 2026-09-01
Re: [PATCH 02/24] alpha: enter hardirq context before looking up the irq descriptor · Magnus Lindholm <linmag7@gmail.com> · 2026-09-03
Re: [PATCH 02/24] alpha: enter hardirq context before looking up the irq descriptor · Matt Turner <mattst88@gmail.com> · 2026-09-05
Re: [PATCH 02/24] alpha: enter hardirq context before looking up the irq descriptor · Magnus Lindholm <linmag7@gmail.com> · 2026-09-05
[PATCH 03/24] alpha: select ARCH_HAS_UBSAN · Matt Turner <mattst88@gmail.com> · 2026-09-01
Re: [PATCH 03/24] alpha: select ARCH_HAS_UBSAN · Magnus Lindholm <linmag7@gmail.com> · 2026-09-01
Re: [PATCH 03/24] alpha: select ARCH_HAS_UBSAN · Michael Cree <hidden> · 2026-09-04
Re: [PATCH 03/24] alpha: select ARCH_HAS_UBSAN · Magnus Lindholm <linmag7@gmail.com> · 2026-09-04
Re: [PATCH 03/24] alpha: select ARCH_HAS_UBSAN · Michael Cree <hidden> · 2026-09-06
[PATCH 04/24] alpha: select ARCH_HAS_GCOV_PROFILE_ALL · Matt Turner <mattst88@gmail.com> · 2026-09-01
Re: [PATCH 04/24] alpha: select ARCH_HAS_GCOV_PROFILE_ALL · Magnus Lindholm <linmag7@gmail.com> · 2026-09-03
[PATCH 05/24] alpha: select HAVE_DEBUG_KMEMLEAK · Matt Turner <mattst88@gmail.com> · 2026-09-01
Re: [PATCH 05/24] alpha: select HAVE_DEBUG_KMEMLEAK · Magnus Lindholm <linmag7@gmail.com> · 2026-09-02
[PATCH 06/24] alpha: select EDAC_SUPPORT · Matt Turner <mattst88@gmail.com> · 2026-09-01
Re: [PATCH 06/24] alpha: select EDAC_SUPPORT · Magnus Lindholm <linmag7@gmail.com> · 2026-09-01
[PATCH 07/24] alpha: select ARCH_SUPPORTS_ATOMIC_RMW · Matt Turner <mattst88@gmail.com> · 2026-09-01
Re: [PATCH 07/24] alpha: select ARCH_SUPPORTS_ATOMIC_RMW · Magnus Lindholm <linmag7@gmail.com> · 2026-09-02
[PATCH 08/24] alpha: select ARCH_HAS_FAST_MULTIPLIER · Matt Turner <mattst88@gmail.com> · 2026-09-01
Re: [PATCH 08/24] alpha: select ARCH_HAS_FAST_MULTIPLIER · Magnus Lindholm <linmag7@gmail.com> · 2026-09-02
[PATCH 09/24] alpha: select ARCH_SUPPORTS_INT128 · Matt Turner <mattst88@gmail.com> · 2026-09-01
Re: [PATCH 09/24] alpha: select ARCH_SUPPORTS_INT128 · Magnus Lindholm <linmag7@gmail.com> · 2026-09-02
[PATCH 10/24] alpha: select HAVE_ARCH_COMPILER_H · Matt Turner <mattst88@gmail.com> · 2026-09-01
Re: [PATCH 10/24] alpha: select HAVE_ARCH_COMPILER_H · Magnus Lindholm <linmag7@gmail.com> · 2026-09-02
[PATCH 11/24] alpha: select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE · Matt Turner <mattst88@gmail.com> · 2026-09-01
Re: [PATCH 11/24] alpha: select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE · Magnus Lindholm <linmag7@gmail.com> · 2026-09-02
[PATCH 12/24] alpha: add HAVE_ARCH_THREAD_STRUCT_WHITELIST support · Matt Turner <mattst88@gmail.com> · 2026-09-01
Re: [PATCH 12/24] alpha: add HAVE_ARCH_THREAD_STRUCT_WHITELIST support · Magnus Lindholm <linmag7@gmail.com> · 2026-09-02
[PATCH 13/24] alpha: add ARCH_HAS_PTE_SPECIAL support · Matt Turner <mattst88@gmail.com> · 2026-09-01
Re: [PATCH 13/24] alpha: add ARCH_HAS_PTE_SPECIAL support · Magnus Lindholm <linmag7@gmail.com> · 2026-09-02
[PATCH 14/24] alpha: add ARCH_SUPPORTS_PAGE_TABLE_CHECK support · Matt Turner <mattst88@gmail.com> · 2026-09-01
Re: [PATCH 14/24] alpha: add ARCH_SUPPORTS_PAGE_TABLE_CHECK support · Magnus Lindholm <linmag7@gmail.com> · 2026-09-01
[PATCH 15/24] alpha: select ARCH_HAS_DEBUG_VM_PGTABLE · Matt Turner <mattst88@gmail.com> · 2026-09-01
Re: [PATCH 15/24] alpha: select ARCH_HAS_DEBUG_VM_PGTABLE · Magnus Lindholm <linmag7@gmail.com> · 2026-09-03
[PATCH 16/24] alpha: select HAVE_GUP_FAST · Matt Turner <mattst88@gmail.com> · 2026-09-01
Re: [PATCH 16/24] alpha: select HAVE_GUP_FAST · Magnus Lindholm <linmag7@gmail.com> · 2026-09-02
[PATCH 17/24] alpha: select ARCH_USE_MEMTEST · Matt Turner <mattst88@gmail.com> · 2026-09-01
Re: [PATCH 17/24] alpha: select ARCH_USE_MEMTEST · Magnus Lindholm <linmag7@gmail.com> · 2026-09-02
[PATCH 18/24] alpha: select SYSCTL_EXCEPTION_TRACE · Matt Turner <mattst88@gmail.com> · 2026-09-01
Re: [PATCH 18/24] alpha: select SYSCTL_EXCEPTION_TRACE · Magnus Lindholm <linmag7@gmail.com> · 2026-09-02
[PATCH 19/24] alpha: discard .eh_frame and the relocation sections · Matt Turner <mattst88@gmail.com> · 2026-09-01
Re: [PATCH 19/24] alpha: discard .eh_frame and the relocation sections · Magnus Lindholm <linmag7@gmail.com> · 2026-09-03
[PATCH 20/24] alpha: select ARCH_WANT_LD_ORPHAN_WARN · Matt Turner <mattst88@gmail.com> · 2026-09-01
Re: [PATCH 20/24] alpha: select ARCH_WANT_LD_ORPHAN_WARN · Magnus Lindholm <linmag7@gmail.com> · 2026-09-03
[PATCH 21/24] alpha: select ARCH_WANT_IRQS_OFF_ACTIVATE_MM · Matt Turner <mattst88@gmail.com> · 2026-09-01
Re: [PATCH 21/24] alpha: select ARCH_WANT_IRQS_OFF_ACTIVATE_MM · Magnus Lindholm <linmag7@gmail.com> · 2026-09-03
[PATCH 22/24] alpha: add HAVE_PERF_REGS and HAVE_PERF_USER_STACK_DUMP support · Matt Turner <mattst88@gmail.com> · 2026-09-01
Re: [PATCH 22/24] alpha: add HAVE_PERF_REGS and HAVE_PERF_USER_STACK_DUMP support · Magnus Lindholm <linmag7@gmail.com> · 2026-09-03
[PATCH 23/24] alpha: select SPARSE_IRQ · Matt Turner <mattst88@gmail.com> · 2026-09-01
Re: [PATCH 23/24] alpha: select SPARSE_IRQ · Magnus Lindholm <linmag7@gmail.com> · 2026-09-03
[PATCH 24/24] alpha: add TRACE_IRQFLAGS_SUPPORT · Matt Turner <mattst88@gmail.com> · 2026-09-01
Re: [PATCH 24/24] alpha: add TRACE_IRQFLAGS_SUPPORT · Magnus Lindholm <linmag7@gmail.com> · 2026-09-03
Re: [PATCH 00/24] alpha: catch up on architecture Kconfig options · Magnus Lindholm <linmag7@gmail.com> · 2026-09-02
Re: [PATCH 00/24] alpha: catch up on architecture Kconfig options · Matt Turner <mattst88@gmail.com> · 2026-09-02

Re: [PATCH 18/24] alpha: select SYSCTL_EXCEPTION_TRACE

From: Magnus Lindholm <linmag7@gmail.com>
Date: 2026-09-02 22:02:32
Also in: lkml

Hi Matt,

On Tue, Sep 1, 2026 at 5:51 PM Matt Turner [off-list ref] wrote:

Report unhandled user faults the way other architectures do, and hook up
the debug.exception-trace sysctl that controls the reporting.

The message gives the faulting address, the PC and the user stack
pointer, and is rate limited.

Assisted-by: Claude:claude-opus-5
Signed-off-by: Matt Turner <mattst88@gmail.com>
---

I tested this on an Alpha UP2000. With debug.exception-trace=1,
unhandled SEGV_MAPERR and SEGV_ACCERR faults produced the expected
"unmapped access" and "access violation" messages.

With debug.exception-trace=0, both processes still received SIGSEGV,
but no additional messages were written to the kernel log.

Tested-by: Magnus Lindholm <linmag7@gmail.com>
Reviewed-by: Magnus Lindholm <linmag7@gmail.com>

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