Masami Hiramatsu (Google) a494d3c8d5 ring-buffer: Flush and stop persistent ring buffer on panic ...

On real hardware, panic and machine reboot may not flush hardware cache
to memory. This means the persistent ring buffer, which relies on a
coherent state of memory, may not have its events written to the buffer
and they may be lost. Moreover, there may be inconsistency with the
counters which are used for validation of the integrity of the
persistent ring buffer which may cause all data to be discarded.

To avoid this issue, stop recording of the ring buffer on panic and
flush the cache of the ring buffer's memory.

Fixes: e645535a95 ("tracing: Add option to use memmapped memory for trace boot instance")
Cc: stable@vger.kernel.org
Cc: Will Deacon <will@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Ian Rogers <irogers@google.com>
Link: https://patch.msgid.link/177751969602.2136606.12031934362587643488.stgit@mhiramat.tok.corp.google.com
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

2026-05-21 08:20:58 -04:00

..

boot

Merge tag 'x86_sev_for_v7.1_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2026-04-14 15:20:54 -07:00

coco

Merge tag 'x86_tdx_for_7.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2026-04-14 14:42:55 -07:00

configs

x86/64/defconfig: Add CONFIG_IRQ_REMAP

2026-03-10 19:01:37 +01:00

crypto

Merge tag 'v7.1-p1' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6

2026-04-15 15:22:26 -07:00

entry

Merge tag 'mm-stable-2026-04-13-21-45' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2026-04-15 12:59:16 -07:00

events

perf/x86/intel: Enable auto counter reload for DMR

2026-05-05 12:47:22 +02:00

hyperv

x86/hyperv: Use any general-purpose register when saving %cr2 and %cr8

2026-03-12 04:25:20 +00:00

ia32

…

include

ring-buffer: Flush and stop persistent ring buffer on panic

2026-05-21 08:20:58 -04:00

kernel

Merge tag 'x86-urgent-2026-05-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2026-05-17 11:40:18 -07:00

kvm

KVM: VMX: introduce module parameter to disable CET

2026-05-13 15:38:22 +02:00

lib

Merge branch 'nocache-cleanup'

2026-04-13 08:39:51 -07:00

math-emu

x86/math-emu: Fix div_Xsig() prototype

2025-11-09 21:01:08 +01:00

mm

x86/efi: Restore IRQ state in EFI page fault handler

2026-05-05 09:31:28 +02:00

net

bpf, x86: Emit ENDBR for indirect jump targets

2026-04-16 07:03:40 -07:00

pci

PCI: Align head space better

2026-03-27 10:19:08 -05:00

platform

x86/efi: Restore IRQ state in EFI page fault handler

2026-05-05 09:31:28 +02:00

power

PM: hibernate: x86: Remove inclusion of crypto/hash.h

2026-03-19 16:13:32 +01:00

purgatory

kcfi: Rename CONFIG_CFI_CLANG to CONFIG_CFI

2025-09-24 14:29:14 -07:00

ras

…

realmode

…

tools

x86/vdso: Clean up remnants of VDSO32_NOTE_MASK

2026-03-31 09:43:29 +02:00

um

Merge tag 'uml-for-7.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux

2026-04-20 16:36:46 -07:00

video

sysfb: Replace screen_info with sysfb_primary_display

2025-12-16 14:12:44 +01:00

virt

Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

2026-04-17 07:18:03 -07:00

xen

x86/xen: Tolerate nested XEN_LAZY_MMU entering/leaving

2026-05-14 18:33:05 +02:00

.gitignore

…

Kbuild

x86/kbuild: Incorporate boot/startup/ via Kbuild makefile

2025-09-03 17:59:59 +02:00

Kconfig

x86/shstk: Prevent deadlock during shstk sigreturn

2026-04-20 22:54:24 +02:00

Kconfig.assembler

x86/kconfig: Remove CONFIG_AS_AVX512

2025-08-21 14:35:01 +02:00

Kconfig.cpu

x86/cpu: Remove M486/M486SX/ELAN support

2026-03-30 11:39:42 +02:00

Kconfig.cpufeatures

Merge tag 'x86_entry_for_7.0-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2026-02-10 19:34:26 -08:00

Kconfig.debug

…

Makefile

kbuild: Consolidate C dialect options

2026-03-12 12:52:37 +01:00

Makefile_32.cpu

x86/cpu: Remove M486/M486SX/ELAN support

2026-03-30 11:39:42 +02:00

Makefile.um

x86/um: fix vDSO installation

2026-03-21 10:43:21 +01:00