linux-kernel - Re: [PATCH v2 08/13] sparc64: vdso: Switch to the generic vDSO library

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Message-ID: <18d9e41c-f05f-4b3e-8217-4b8deb7afabd@gaisler.com>
Date: Mon, 1 Sep 2025 16:28:52 +0200
From: Andreas Larsson <andreas@...sler.com>
To: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Cc: Andy Lutomirski <luto@...nel.org>, Thomas Gleixner <tglx@...utronix.de>,
 Vincenzo Frascino <vincenzo.frascino@....com>, Arnd Bergmann
 <arnd@...db.de>, "David S. Miller" <davem@...emloft.net>,
 Nagarathnam Muthusamy <nagarathnam.muthusamy@...cle.com>,
 Nick Alcock <nick.alcock@...cle.com>, John Stultz <jstultz@...gle.com>,
 Stephen Boyd <sboyd@...nel.org>,
 John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
 linux-kernel@...r.kernel.org, sparclinux@...r.kernel.org
Subject: Re: [PATCH v2 08/13] sparc64: vdso: Switch to the generic vDSO
 library

On 2025-08-29 19:07, Thomas Weißschuh wrote:
> What does this do?
> 
> diff --git a/kernel/signal.c b/kernel/signal.c
> index e2c928de7d2c..6ae7afae948c 100644
> --- a/kernel/signal.c
> +++ b/kernel/signal.c
> @@ -1299,6 +1299,11 @@ force_sig_info_to_task(struct kernel_siginfo *info, struct task_struct *t,
>         struct k_sigaction *action;
>         int sig = info->si_signo;
>  
> +       if (unlikely(is_global_init(t)) && sig == SIGSEGV)
> +               panic("killing init, sig=%d errno=%d code=%d addr=%d vdso=%px",
> +                     info->si_signo, info->si_errno, info->si_code, info->si_addr,
> +                     t->mm->context.vdso);
> +
>         spin_lock_irqsave(&t->sighand->siglock, flags);
>         action = &t->sighand->action[sig-1];
>         ignored = action->sa.sa_handler == SIG_IGN;

This (with addr=%px) results in:

[    2.073506] Run /init as init process
[    2.076547] Kernel panic - not syncing: killing init, sig=11 errno=0 code=1 addr=0000000000000000 vdso=fff8000100384000
[    2.076594] CPU: 7 UID: 0 PID: 1 Comm: init Not tainted 6.17.0-rc1-00010-gf63e40394cec #11 VOLUNTARY 
[    2.076620] Call Trace:
[    2.076632] [<0000000000436524>] dump_stack+0x8/0x18
[    2.076660] [<00000000004291f4>] vpanic+0xdc/0x320
[    2.076682] [<000000000042945c>] panic+0x24/0x30
[    2.076700] [<0000000000493240>] force_sig_info_to_task+0x200/0x220
[    2.076726] [<0000000000493720>] force_sig_fault+0x40/0x60
[    2.076747] [<0000000000439e28>] sun4v_data_access_exception+0xa8/0x140
[    2.076770] [<00000000004066d4>] sun4v_dacc+0x28/0x34
[    2.077940] Press Stop-A (L1-A) from sun keyboard or send break
[    2.077940] twice on console to return to the boot prom
[    2.077981] ---[ end Kernel panic - not syncing: killing init, sig=11 errno=0 code=1 addr=0000000000000000 vdso=fff8000100384000 ]---

Cheers,
Andreas