linux-kernel - Re: (Re)boot hangs and refcount errors on next-20250829

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Message-ID: <20250831153941.GCaLRsvf1V_ST2GPAd@fat_crate.local>
Date: Sun, 31 Aug 2025 17:39:41 +0200
From: Borislav Petkov <bp@...en8.de>
To: Bert Karwatzki <spasswolf@....de>
Cc: seanjc@...gle.com, Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-rt-devel@...ts.linux.dev,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	Jakub Kicinski <kuba@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	torvalds@...ux-foundation.org, x86@...nel.org, tglx@...utronix.de
Subject: Re: (Re)boot hangs and refcount errors on next-20250829

On Sun, Aug 31, 2025 at 04:14:24PM +0200, Bert Karwatzki wrote:
> I think I hit the the same error (and some more ...) when booting next-20250829
> on my amd64 laptop (no VMs and no kexec were used here):
> 
> When I try booting next-20250829 on my debian stable(trixie) amd64 system the boot
> process hangs every few attempts (without any log messages recorded). When the
> boot process succeeds the following error message appears in dmesg:
> 
> [    8.337248] [     T44] ------------[ cut here ]------------
> [    8.337250] [     T44] WARNING: kernel/futex/core.c:1604 at futex_ref_rcu+0xe8/0x100, CPU#6: rcuc/6/44

I believe that got fixed, pls try:

https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/log/?h=locking/urgent

which got updated to contain the fix for the warning above.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette