In message: Re: [linux-yocto][v6.12/standard/preempt-rt/base][PATCH 0/3]
intel-x86-64: fix the call trace in acpi s4
on 04/02/2026 Jianpeng Chang wrote:
>
>
> 在 2026/2/4 上午7:29, Bruce Ashfield 写道:
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> >
> > In message: [linux-yocto][v6.12/standard/preempt-rt/base][PATCH 0/3]
> > intel-x86-64: fix the call trace in acpi s4
> > on 03/02/2026 Jianpeng Chang wrote:
> >
> > > Hi Bruce,
> > >
> > > Could you please merge these three patches into
> > > v6.12/standard/preempt-rt/base?
> >
> > Does 6.18-rt need the same changes ?
> NO. These patches went into linux-stable 6.18.6 in upstream. Now they are
> already in linux-yocto 6.18
merged.
Bruce
> >
> > Bruce
> >
> > >
> > > Allowing irq_work to be scheduled while trying to suspend has shown
> > > to cause problems as some architectures interpret the pending
> > > interrupts as a reason to not suspend. This became a problem for
> > > printk() with the introduction of NBCON consoles.
> > >
> > > Linux yocto introduce nbcon since commit 3b739d55b861 ("serial: 8250:
> > > Switch to nbcon console") in 6.12 preempt-rt.
> > > This will encounter call trace when suspend in acpi s4 occasionally:
> > > unchecked MSR access error: WRMSR to 0x83f (tried to write
> > > 0x00000000000000f6) at rIP: 0xffffffff8947e2f6
> > > (native_apic_msr_write+0x26/0x50)
> > > Call Trace:
> > > <TASK>
> > > ? x2apic_send_IPI_self+0x19/0x20
> > > arch_irq_work_raise+0x28/0x40
> > > __irq_work_queue_local+0x40/0xf0
> > > irq_work_queue+0x31/0x60
> > > nbcon_kthreads_wake+0x5f/0x80
> > > vprintk_emit+0x2c9/0x440
> > > vprintk_deferred+0x21/0x30
> > > vprintk+0x12/0x20
> > > _printk+0x6c/0x87
> > > swsusp_save+0x26/0x3a3
> > > swsusp_arch_suspend+0x63/0x70
> > > hibernation_snapshot+0x349/0x550
> > > hibernate.cold+0xba/0x2a7
> > >
> > > There is no nbcon in upstream v6.12, these patches will not go into v6.12.
> > > So backport them to avoid calling irq_work when suspend to fix unchecked
> > > MSR access error.
> > >
> > > Patch 3 is a fix for the former one.
> > > See the links:
> > > https://lore.kernel.org/all/[email protected]/
> > > https://lore.kernel.org/all/[email protected]/
> > >
> > > Regards,
> > > Jianpeng
> > >
> > > John Ogness (3):
> > > printk: Allow printk_trigger_flush() to flush all types
> > > printk: Avoid scheduling irq_work on suspend
> > > printk: Avoid irq_work for printk_deferred() on suspend
> > >
> > > kernel/printk/internal.h | 8 ++--
> > > kernel/printk/nbcon.c | 9 ++++-
> > > kernel/printk/printk.c | 83 ++++++++++++++++++++++++++++++++--------
> > > 3 files changed, 79 insertions(+), 21 deletions(-)
> > >
> > > --
> > > 2.49.1
> > >
>
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