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Date:   Tue, 04 Jul 2023 14:36:51 -0700
From:   Kees Cook <kees@kernel.org>
To:     Mirsad Todorovac <mirsad.todorovac@alu.unizg.hr>,
        Kees Cook <keescook@chromium.org>
CC:     Guenter Roeck <linux@roeck-us.net>,
        Bagas Sanjaya <bagasdotme@gmail.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux LLVM <llvm@lists.linux.dev>,
        linux-kbuild@vger.kernel.org,
        Linux Regressions <regressions@lists.linux.dev>,
        Nathan Chancellor <nathan@kernel.org>,
        Nick Desaulniers <ndesaulniers@google.com>,
        linux-hardening@vger.kernel.org
Subject: Re: [CRASH][BISECTED] 6.4.1 crash in boot
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References: <9a8e34ad-8a8b-3830-4878-3c2c82e69dd9@alu.unizg.hr> <ZKIoBVzrjZ+Ybxy9@debian.me> <202307022018.B26F5795@keescook> <625e951e-9922-d15d-5520-e8cd5eba1995@roeck-us.net> <4fa56264-f188-46f9-cc77-117b469b3328@roeck-us.net> <2b1a4f49-ba18-0246-af09-4e4133814411@alu.unizg.hr> <202307022230.6121D6896@keescook> <ed3e4315-b149-2f9e-70d4-45d7f83b9922@alu.unizg.hr> <202307031149.823F9A3@keescook> <202307031606.3FD9D0D@keescook> <fbf4103b-6471-1f06-34a8-4aa227f5e091@alu.unizg.hr>
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On July 4, 2023 10:20:11 AM PDT, Mirsad Todorovac <mirsad=2Etodorovac@alu=
=2Eunizg=2Ehr> wrote:
>On 7/4/23 01:09, Kees Cook wrote:> On Mon, Jul 03, 2023 at 12:03:23PM -07=
00, Kees Cook wrote:
>>> Cool=2E xhci-hub is in your backtrace, and the above patch was made fo=
r
>>> something very similar (though, again, I don't see why you're getting =
a
>>> _crash_, it should _warn_ and continue normally)=2E And, actually, als=
o
>>> include this patch:
>>> https://lore=2Ekernel=2Eorg/lkml/20230614181307=2Egonna=2E256-kees@ker=
nel=2Eorg/
>>=20
>> This is now in Linus's tree:
>> 09b69dd4378b ("usb: ch9: Replace 1-element array with flexible array")
>>=20
>> Please also still try with the first patch I mentioned, which is very s=
imilar:
>> https://lore=2Ekernel=2Eorg/lkml/20230629190900=2Enever=2E787-kees@kern=
el=2Eorg/
>
>Hi,
>
>I have finally built w both patches (and recommended PSTORE settings were
>default already)=2E

Were you able to find the crashes saved by pstore?

>
>This second patch fixes the booting problem, but alas there is still a pr=
oblem -

Ah! That's great! They're is still an unexpected crash source, but the tri=
gger is fixed=2E

>all Wayland and X11=2Eorg GUI applications fail to start, with errors lik=
e this one:
>
>Jul  4 19:09:07 defiant kernel: [   40=2E529719] invalid opcode: 0000 [#1=
] PREEMPT SMP NOPTI

Hmm, is CONFIG_UBSAN_TRAP set?

>Jul  4 19:09:07 defiant kernel: [   40=2E529726] RIP: 0010:alloc_pid+0x46=
c/0x480

Hmm, is this patch in your kernel?
https://git=2Ekernel=2Eorg/linus/b69f0aeb068980af983d399deafc7477cec8bc04


--=20
Kees Cook