linux-kernel - Re: [PATCH v2] powerpc/irq: Increase stack_overflow detection limit when KASAN is enabled

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Message-Id: <165693439802.9954.361439982234083073.b4-ty@ellerman.id.au>
Date:   Mon, 04 Jul 2022 21:33:18 +1000
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Christophe Leroy <christophe.leroy@...roup.eu>,
        Paul Mackerras <paulus@...ba.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Erhard Furtner <erhard_f@...lbox.org>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] powerpc/irq: Increase stack_overflow detection limit when KASAN is enabled

On Fri, 3 Jun 2022 15:08:14 +0200, Christophe Leroy wrote:
> When KASAN is enabled, as shown by the Oops below, the 2k limit is not
> enough to allow stack dump after a stack overflow detection when
> CONFIG_DEBUG_STACKOVERFLOW is selected:
> 
> 	do_IRQ: stack overflow: 1984
> 	CPU: 0 PID: 126 Comm: systemd-udevd Not tainted 5.18.0-gentoo-PMacG4 #1
> 	Call Trace:
> 	Oops: Kernel stack overflow, sig: 11 [#1]
> 	BE PAGE_SIZE=4K MMU=Hash SMP NR_CPUS=2 PowerMac
> 	Modules linked in: sr_mod cdrom radeon(+) ohci_pci(+) hwmon i2c_algo_bit drm_ttm_helper ttm drm_dp_helper snd_aoa_i2sbus snd_aoa_soundbus snd_pcm ehci_pci snd_timer ohci_hcd snd ssb ehci_hcd 8250_pci soundcore drm_kms_helper pcmcia 8250 pcmcia_core syscopyarea usbcore sysfillrect 8250_base sysimgblt serial_mctrl_gpio fb_sys_fops usb_common pkcs8_key_parser fuse drm drm_panel_orientation_quirks configfs
> 	CPU: 0 PID: 126 Comm: systemd-udevd Not tainted 5.18.0-gentoo-PMacG4 #1
> 	NIP:  c02e5558 LR: c07eb3bc CTR: c07f46a8
> 	REGS: e7fe9f50 TRAP: 0000   Not tainted  (5.18.0-gentoo-PMacG4)
> 	MSR:  00001032 <ME,IR,DR,RI>  CR: 44a14824  XER: 20000000
> 
> [...]

Applied to powerpc/next.

[1/1] powerpc/irq: Increase stack_overflow detection limit when KASAN is enabled
      https://git.kernel.org/powerpc/c/41f20d6db2b64677225bb0b97df956241c353ef8

cheers