linux-kernel - Re: slub freelist issue / BUG: unable to handle page fault for address: 000000003ffe0018

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Date:   Fri, 5 Jun 2020 11:36:31 +0200
From:   Vegard Nossum <vegard.nossum@...cle.com>
To:     Vlastimil Babka <vbabka@...e.cz>, Kees Cook <keescook@...omium.org>
Cc:     Christoph Lameter <cl@...ux.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Marco Elver <elver@...gle.com>,
        Waiman Long <longman@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux MM <linux-mm@...ck.org>, linux-acpi@...r.kernel.org,
        Robert Moore <robert.moore@...el.com>,
        Erik Kaneda <erik.kaneda@...el.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Len Brown <lenb@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: slub freelist issue / BUG: unable to handle page fault for
 address: 000000003ffe0018


On 2020-06-05 11:11, Vlastimil Babka wrote:
> On 6/4/20 8:46 PM, Vlastimil Babka wrote:
>> On 6/4/20 7:57 PM, Kees Cook wrote:
>>> On Thu, Jun 04, 2020 at 07:20:18PM +0200, Vegard Nossum wrote:
>>>> On 2020-06-04 19:18, Vlastimil Babka wrote:
>>>>> On 6/4/20 7:14 PM, Vegard Nossum wrote:
>>>>>>
>>>>>> Hi all,
>>>>>>
>>>>>> I ran into a boot problem with latest linus/master
>>>>>> (6929f71e46bdddbf1c4d67c2728648176c67c555) that manifests like this:
>>>>>
>>>>> Hi, what's the .config you use?
>>>>
>>>> Pretty much x86_64 defconfig minus a few options (PCI, USB, ...)
>>>
>>> Oh yes indeed. I immediately crash in the same way with this config. I'll
>>> start digging...
>>>
>>> (defconfig finishes boot)
>>
>> This is funny, booting with slub_debug=F results in:
>> I'm not sure if it's ACPI or ftrace wrong here, but looks like the changed
>> free pointer offset merely exposes a bug in something else.
> 
> So, with Kees' patch reverted, booting with slub_debug=F (or even more
> specific slub_debug=F,ftrace_event_field) also hits this bug below. I
> wanted to bisect it, but v5.7 was also bad, and also v5.6. Didn't try
> further in history. So it's not new at all, and likely very specific to
> your config+QEMU? (and related to the ACPI error messages that precede it?).

I see it too, but not on v5.0. I can bisect it.

Also, panic_on_warn is apparently a core parameter, it should probably 
be __setup()...


Vegard

> 
>> This would mean acpi_os_release_object() calling kmem_cache_free(ftrace_event_field, x)
>> where x is actually from kmalloc-64? Both parts of that sounds wrong.
>>
>> Thread starts here: https://lore.kernel.org/linux-mm/4dc93ff8-f86e-f4c9-ebeb-6d3153a78d03@oracle.com/
>>
>> [    0.144386] ACPI: Added _OSI(Module Device)
>> [    0.144496] ACPI: Added _OSI(Processor Device)
>> [    0.144956] ACPI: Added _OSI(3.0 _SCP Extensions)
>> [    0.145432] ACPI: Added _OSI(Processor Aggregator Device)
>> [    0.145501] ACPI: Added _OSI(Linux-Dell-Video)
>> [    0.145951] ACPI: Added _OSI(Linux-Lenovo-NV-HDMI-Audio)
>> [    0.146522] ACPI: Added _OSI(Linux-HPI-Hybrid-Graphics)
>> [    0.147070] ACPI Error: AE_BAD_PARAMETER, During Region initialization (20200430/tbxfload-52)
>> [    0.147494] ACPI: Unable to load the System Description Tables
>> [    0.148104] ACPI Error: Could not remove SCI handler (20200430/evmisc-251)
>> [    0.148507] ------------[ cut here ]------------
>> [    0.148985] cache_from_obj: Wrong slab cache. ftrace_event_field but object is from kmalloc-64
>> [    0.149502] WARNING: CPU: 0 PID: 1 at mm/slab.h:523 kmem_cache_free+0x248/0x260
>> [    0.150254] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.7.0+ #43
>> [    0.150490] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4-rebuilt.opensuse.org 04/01/2014
>> [    0.150490] RIP: 0010:kmem_cache_free+0x248/0x260
>> [    0.150490] Code: ff 0f 0b e9 9d fe ff ff 49 8b 4d 58 48 8b 55 58 48 c7 c6 10 47 c1 a4 48 c7 c7 f0 c1 d0 a4 c6 05 9f 05 b1 00 01 e8 bc cc eb ff <0f> 0b 48 8b 15 5f 36 9b 00 4c 89 ed e9 d6 fd ff ff 0f 1f 80 00 00
>> [    0.150490] RSP: 0018:ffffb4dac0013dc0 EFLAGS: 00010282
>> [    0.150490] RAX: 0000000000000000 RBX: ffffa38a07409e00 RCX: 0000000000000000
>> [    0.150490] RDX: 0000000000000001 RSI: 0000000000000092 RDI: ffffffffa51dd32c
>> [    0.150490] RBP: ffffa38a07403900 R08: ffffb4dac0013c7d R09: 00000000000000eb
>> [    0.150490] R10: ffffb4dac0013c78 R11: ffffb4dac0013c7d R12: ffffa38a87409e00
>> [    0.150490] R13: ffffa38a07401d00 R14: 0000000000000000 R15: 0000000000000000
>> [    0.150490] FS:  0000000000000000(0000) GS:ffffa38a07a00000(0000) knlGS:0000000000000000
>> [    0.150490] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> [    0.150490] CR2: 0000000000000000 CR3: 000000000560a000 CR4: 00000000003406f0
>> [    0.150490] Call Trace:
>> [    0.150490]  acpi_os_release_object+0x5/0x10
>> [    0.150490]  acpi_ns_delete_children+0x46/0x59
>> [    0.150490]  acpi_ns_delete_namespace_subtree+0x5c/0x79
>> [    0.150490]  ? acpi_sleep_proc_init+0x1f/0x1f
>> [    0.150490]  acpi_ns_terminate+0xc/0x31
>> [    0.150490]  acpi_ut_subsystem_shutdown+0x45/0xa3
>> [    0.150490]  ? acpi_sleep_proc_init+0x1f/0x1f
>> [    0.150490]  acpi_terminate+0x5/0xf
>> [    0.150490]  acpi_init+0x27b/0x308
>> [    0.150490]  ? video_setup+0x79/0x79
>> [    0.150490]  do_one_initcall+0x7b/0x160
>> [    0.150490]  kernel_init_freeable+0x190/0x1f2
>> [    0.150490]  ? rest_init+0x9a/0x9a
>> [    0.150490]  kernel_init+0x5/0xf6
>> [    0.150490]  ret_from_fork+0x22/0x30
>> [    0.150490] ---[ end trace 967e9fbc065d7911 ]---
>>
>>
>>
>