Regression on linux-next (next-20250205)

[Borah, Chaitanya Kumar]

> -----Original Message-----
> From: Mike Rapoport <rppt at kernel.org>
> Sent: Wednesday, February 12, 2025 12:15 PM
> To: Borah, Chaitanya Kumar <chaitanya.kumar.borah at intel.com>
> Cc: intel-gfx at lists.freedesktop.org; intel-xe at lists.freedesktop.org; Saarinen,
> Jani <jani.saarinen at intel.com>; Kurmi, Suresh Kumar
> <suresh.kumar.kurmi at intel.com>; x86 at kernel.org; De Marchi, Lucas
> <lucas.demarchi at intel.com>
> Subject: Re: Regression on linux-next (next-20250205)
> 
> On Tue, Feb 11, 2025 at 12:30:01PM +0000, Borah, Chaitanya Kumar wrote:
> > Hello Mike,
> >
> > > -----Original Message-----
> > > From: Mike Rapoport <rppt at kernel.org>
> > > Sent: Tuesday, February 11, 2025 1:21 PM
> > > To: Borah, Chaitanya Kumar <chaitanya.kumar.borah at intel.com>
> > > Cc: intel-gfx at lists.freedesktop.org; intel-xe at lists.freedesktop.org;
> > > Saarinen, Jani <jani.saarinen at intel.com>; Kurmi, Suresh Kumar
> > > <suresh.kumar.kurmi at intel.com>; x86 at kernel.org; De Marchi, Lucas
> > > <lucas.demarchi at intel.com>
> > > Subject: Re: Regression on linux-next (next-20250205)
> > >
> > > Hello Chaitanya,
> > >
> > > On Mon, Feb 10, 2025 at 06:52:35AM +0000, Borah, Chaitanya Kumar
> > > wrote:
> > > > Hello Mike,
> > > >
> > > > Hope you are doing well. I am Chaitanya from the linux graphics
> > > > team in
> > > Intel.
> > > >
> > > > This mail is regarding a regression we are seeing in our CI
> > > > runs[1] on linux-
> > > next repository.
> > > >
> > > > Since the version next-20250205 [2], we are seeing the following
> > > > regression
> > > >
> > > > ``````````````````````````````````````````````````````````````````
> > > > ```` ``````````` <4>[  314.781734] kmemleak: Found object by alias
> > > > at
> > > > 0xffffffffa0595000 <4>[  314.781738] CPU: 11 UID: 0 PID: 6042 Comm:
> > > > i915_selftest Tainted: G     U
> > > > 6.14.0-rc1-next-20250205-next-20250205-ged88b8b82c53+ #1 <4>[
> > > > 314.781741] Tainted: [U]=USER <4>[  314.781741] Hardware name:
> > > > ASUS System Product Name/PRIME Z790-P WIFI, BIOS 0812 02/24/2023
> > > <4>[  314.781742] Call Trace:
> > > > <4>[  314.781743]  <TASK>
> > > > <4>[  314.781744]  dump_stack_lvl+0x91/0xf0 <4>[  314.781749]
> > > > dump_stack+0x10/0x20 <4>[  314.781751]  __lookup_object+0x90/0xa0
> > > <4>[
> > > > 314.781755]  __find_and_get_object+0x6c/0x190 <4>[  314.781758]
> > > > paint_ptr+0x1b/0xa0 <4>[  314.781759]  kmemleak_not_leak+0x33/0x70
> > > > <4>[  314.781762]  load_module+0xa20/0x2d10
> > > > ``````````````````````````````````````````````````````````````````
> > > > ````
> > > > ```````````
> > > > Details log can be found in [3].
> > >
> > > Does this fix it for you?
> > >
> > >
> > > diff --git a/kernel/module/main.c b/kernel/module/main.c index
> > > 4a02503836d7..a598888e7072 100644
> > > --- a/kernel/module/main.c
> > > +++ b/kernel/module/main.c
> > > @@ -1260,7 +1260,8 @@ static int module_memory_alloc(struct module
> > > *mod, enum mod_mem_type type)
> > >  	 * *do* eventually get freed, but let's just keep things simple
> > >  	 * and avoid *any* false positives.
> > >  	 */
> > > -	kmemleak_not_leak(ptr);
> > > +	if (!mod->mem[type].is_rox)
> > > +		kmemleak_not_leak(ptr);
> > >
> > >  	memset(ptr, 0, size);
> > >  	mod->mem[type].base = ptr;
> > >
> > >
> >
> > Thank you for your reply.
> >
> > Unfortunately, the change makes it worse. Our local system seems to be in
> continuous reboot.
> 
> Are there any logs available?

False alarm! The cyclic resets we are seeing may not be related to your change. Our systems are facing this even with the latest vanilla linux-next. We are looking into it.

Good news is that if we take your change over the version which first detected the issue(next-20250205), it seems to resolve it. Can we expect a formal patch soon?

Regards

Chaitanya


> 
> > Regards
> >
> > Chaitanya
> >
> > > > [1] https://intel-gfx-ci.01.org/tree/linux-next/combined-alt.html?
> > > > [2]
> > > > https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.gi
> > > > t/co
> > > > mmit/?h=next-20250205 [3]
> > > > https://intel-gfx-ci.01.org/tree/linux-next/next-20250205/bat-rpls
> > > > -4/d
> > > > mesg0.txt [4]
> > > > https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.gi
> > > > t/co
> > > > mmit/?h=next-
> > > 20250205&id=64f6a4e10c05ed527f0f24b7954964255e0d3535
> > > >
> > > > Regards
> > > > Chaitanya
> > >
> > > --
> > > Sincerely yours,
> > > Mike.
> 
> --
> Sincerely yours,
> Mike.