linux-kernel - Re: [PATCH] Revert "LoongArch: Remove unnecessary checks for ORC unwinder"

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Message-ID: <CAAhV-H4eV7CQ07rKZV+pCh9xikWrDztBATMYpVEb43Z3sVg_CQ@mail.gmail.com>
Date: Wed, 14 Jan 2026 12:57:39 +0800
From: Huacai Chen <chenhuacai@...nel.org>
To: Tiezhu Yang <yangtiezhu@...ngson.cn>
Cc: loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Revert "LoongArch: Remove unnecessary checks for ORC unwinder"

On Tue, Jan 13, 2026 at 9:17 AM Tiezhu Yang <yangtiezhu@...ngson.cn> wrote:
>
> On 2026/1/12 下午5:23, Huacai Chen wrote:
> > Hi, Tiezhu,
> >
> > On Mon, Jan 12, 2026 at 5:15 PM Tiezhu Yang <yangtiezhu@...ngson.cn> wrote:
> >>
> >> This reverts commit 4cd641a79e69270a062777f64a0dd330abb9044a.
> >>
> >> The system can not boot normally with the latest kernel 6.19-rc5 under
> >> different configs, commit 4cd641a79e69 ("LoongArch: Remove unnecessary
> >> checks for ORC unwinder") is the first bad commit since 6.19-rc4, just
> >> revert it first before finding the root cause.
> > Can you show the errors in the boot log?
>
> Please see the coming v2 patch, there are more info in the commit
> message.
I also see "cannot find unwind pc at" when I debug KASAN, but since
KASAN is not enabled by default, we don't need to revert it.

And I have dumped one of the call traces of this message, hope it is
helpful for you.

[<9000000004ec3c9c>] show_stack+0x5c/0x190
[<9000000006c1889c>] dump_stack_lvl+0x6c/0x9c
[<9000000004ed6d08>] unwind_next_frame+0x998/0x9c0
[<9000000004ed1fd4>] arch_stack_walk+0xd4/0x1b0
[<90000000050313e4>] stack_trace_save+0x54/0x90
[<90000000052bd880>] kasan_save_stack+0x30/0x60
[<90000000052c0368>] __kasan_record_aux_stack+0x108/0x130
[<9000000004f521c0>] task_work_add+0x100/0x300
[<9000000004f77c58>] sched_tick+0x138/0x440
[<9000000005036460>] update_process_times+0xf0/0x160
[<900000000504fb38>] tick_nohz_handler+0xf8/0x260
[<900000000503731c>] __hrtimer_run_queues+0x20c/0x330
[<9000000005038bb0>] hrtimer_interrupt+0x1a0/0x3f0
[<9000000004ec86ec>] constant_timer_interrupt+0x5c/0x80
[<9000000004fe9dcc>] __handle_irq_event_percpu+0x6c/0x190
[<9000000004fe9f04>] handle_irq_event_percpu+0x14/0xa0
[<9000000004ff3eec>] handle_percpu_irq+0x8c/0xe0
[<9000000004fe8eb0>] generic_handle_domain_irq+0x50/0xc0
[<9000000005caf8b4>] handle_cpu_irq+0x54/0x90
[<9000000006c18d88>] handle_loongarch_irq+0x28/0x40
[<9000000006c18e64>] do_vint+0xc4/0xf0

Huacai

>
> Thanks,
> Tiezhu
>
>