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Date:   Mon, 3 Jul 2023 08:44:37 +0700
From:   Bagas Sanjaya <bagasdotme@gmail.com>
To:     Mirsad Goran Todorovac <mirsad.todorovac@alu.unizg.hr>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux LLVM <llvm@lists.linux.dev>
Cc:     linux-kbuild@vger.kernel.org, Kees Cook <keescook@chromium.org>,
        Linux Regressions <regressions@list.linux.dev>,
        Nathan Chancellor <nathan@kernel.org>,
        Nick Desaulniers <ndesaulniers@google.com>,
        Guenter Roeck <linux@roeck-us.net>
Subject: Re: [CRASH][BISECTED] 6.4.1 crash in boot
Message-ID: <ZKIoBVzrjZ+Ybxy9@debian.me>
References: <9a8e34ad-8a8b-3830-4878-3c2c82e69dd9@alu.unizg.hr>
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On Sun, Jul 02, 2023 at 06:36:12PM +0200, Mirsad Goran Todorovac wrote:
> Hi,
>=20
> After new git pull the kernel in Torvalds tree with default debug config
> failed to boot with error that occurs prior to mounting filesystems, so t=
here
> is no log safe for the screenshot(s) here:
>=20
> [1] https://domac.alu.unizg.hr/~mtodorov/linux/crashes/2023-07-02/
>=20
> Bisect shows the first bad commit is 2d47c6956ab3 (v6.4-rc2-1-g2d47c6956a=
b3):
>=20
> # good: [98be618ad03010b1173fc3c35f6cbb4447ee2b07] Merge tag 'Smack-for-6=
=2E5' of https://github.com/cschaufler/smack-next
> git bisect good 98be618ad03010b1173fc3c35f6cbb4447ee2b07
> # bad: [f4a0659f823e5a828ea2f45b4849ea8e2dd2984c] drm/i2c: tda998x: Repla=
ce all non-returning strlcpy with strscpy
> git bisect bad f4a0659f823e5a828ea2f45b4849ea8e2dd2984c
> .
> .
> .
> # bad: [2d47c6956ab3c8b580a59d7704aab3e2a4882b6c] ubsan: Tighten UBSAN_BO=
UNDS on GCC
> git bisect bad 2d47c6956ab3c8b580a59d7704aab3e2a4882b6c
> # first bad commit: [2d47c6956ab3c8b580a59d7704aab3e2a4882b6c] ubsan: Tig=
hten UBSAN_BOUNDS on GCC
>=20
> The architecture is Ubuntu 22.04 with lshw and config give in the attachm=
ent.

Can you show early kernel log (something like dmesg)?

Anyway, I'm adding it to regzbot:

#regzbot ^introduced: 2d47c6956ab3c8
#regzbot title: Linux kernel fails to boot due to UBSAN_BOUNDS tightening

Thanks.

--=20
An old man doll... just what I always wanted! - Clara

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