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

["Rafael J. Wysocki" <rafael@kernel.org>]

On Fri, Jun 5, 2020 at 2:48 PM Vegard Nossum <vegard.nossum@oracle.com> wrote:
>
> On 2020-06-05 11:36, Vegard Nossum wrote:
> >
> > 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.
>
> commit 67a72420a326b45514deb3f212085fb2cd1595b5
> Author: Bob Moore <robert.moore@intel.com>
> Date:   Fri Aug 16 14:43:21 2019 -0700
>
>      ACPICA: Increase total number of possible Owner IDs
>
>      ACPICA commit 1f1652dad88b9d767767bc1f7eb4f7d99e6b5324
>
>      From 255 to 4095 possible IDs.
>
>      Link: https://github.com/acpica/acpica/commit/1f1652da
>      Reported-by: Hedi Berriche <hedi.berriche @hpe.com>
>      Signed-off-by: Bob Moore <robert.moore@intel.com>
>      Signed-off-by: Erik Schmauss <erik.schmauss@intel.com>
>      Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Bob, Erik, did we miss something in that patch?

> >>> 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 ]---
> >>>
> >>>
> >>>
> >>
> >
>