> -----Original Message----- > From: Vegard Nossum <vegard.nossum@xxxxxxxxxx> > Sent: Friday, June 5, 2020 7:45 AM > To: Vlastimil Babka <vbabka@xxxxxxx>; Rafael J. Wysocki > <rafael@xxxxxxxxxx>; Moore, Robert <robert.moore@xxxxxxxxx>; Kaneda, > Erik <erik.kaneda@xxxxxxxxx> > Cc: Kees Cook <keescook@xxxxxxxxxxxx>; Wysocki, Rafael J > <rafael.j.wysocki@xxxxxxxxx>; Christoph Lameter <cl@xxxxxxxxx>; Andrew > Morton <akpm@xxxxxxxxxxxxxxxxxxxx>; Marco Elver <elver@xxxxxxxxxx>; > Waiman Long <longman@xxxxxxxxxx>; LKML <linux- > kernel@xxxxxxxxxxxxxxx>; Linux MM <linux-mm@xxxxxxxxx>; ACPI Devel > Maling List <linux-acpi@xxxxxxxxxxxxxxx>; Len Brown <lenb@xxxxxxxxxx>; > Steven Rostedt <rostedt@xxxxxxxxxxx> > Subject: Re: slub freelist issue / BUG: unable to handle page fault for > address: 000000003ffe0018 > > On 2020-06-05 16:08, Vlastimil Babka wrote: > > On 6/5/20 3:12 PM, Rafael J. Wysocki wrote: > >> On Fri, Jun 5, 2020 at 2:48 PM Vegard Nossum > <vegard.nossum@xxxxxxxxxx> 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@xxxxxxxxx> > >>> 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@xxxxxxxxx> > >>> Signed-off-by: Erik Schmauss <erik.schmauss@xxxxxxxxx> > >>> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> > >> > >> Bob, Erik, did we miss something in that patch? > > > > Maybe the patch just changes layout in a way that exposes the bug. > > > > Anyway the "ftrace_event_field" cache is not really involved, this is > > just because of slab merging. After adding "slub_nomerge" to > > "slub_debug=F", it starts making more sense, as the cache becomes > > Acpi-Namespace > > > > [ 0.140408] ------------[ cut here ]------------ > > [ 0.140837] cache_from_obj: Wrong slab cache. Acpi-Namespace but > object is from kmalloc-64 > > [ 0.141406] WARNING: CPU: 0 PID: 1 at mm/slab.h:524 > kmem_cache_free+0x1d3/0x250 > > [ 0.142105] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.7.0+ #45 > > [ 0.142393] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), > BIOS rel-1.13.0-0-gf21b5a4-rebuilt.opensuse.org 04/01/2014 > > [ 0.142393] RIP: 0010:kmem_cache_free+0x1d3/0x250 > > [ 0.142393] Code: 18 4d 85 ed 0f 84 10 ff ff ff 4c 39 ed 74 2f 49 8b 4d 58 48 > 8b 55 58 48 c7 c6 10 47 a1 ac 48 c7 c7 00 c2 b0 ac e8 b1 cc eb ff <0f> 0b 48 89 de > 4c 89 ef e8 10 d7 ff ff 48 8b 15 59 36 9b 00 4c 89 > > [ 0.142393] RSP: 0018:ffffb39cc0013dc0 EFLAGS: 00010282 > > [ 0.142393] RAX: 0000000000000000 RBX: ffff937287409e00 RCX: > 0000000000000000 > > [ 0.142393] RDX: 0000000000000001 RSI: 0000000000000092 RDI: > ffffffffacfdd32c > > [ 0.142393] RBP: ffff93728742ef00 R08: ffffb39cc0013c7d R09: > 00000000000000fc > > [ 0.142393] R10: ffffb39cc0013c78 R11: ffffb39cc0013c7d R12: > ffff937307409e00 > > [ 0.142393] R13: ffff937287401d00 R14: 0000000000000000 R15: > 0000000000000000 > > [ 0.142393] FS: 0000000000000000(0000) GS:ffff937287a00000(0000) > knlGS:0000000000000000 > > [ 0.142393] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > [ 0.142393] CR2: 0000000000000000 CR3: 0000000003a0a000 CR4: > 00000000003406f0 > > [ 0.142393] Call Trace: > > [ 0.142393] acpi_os_release_object+0x5/0x10 > > [ 0.142393] acpi_ns_delete_children+0x46/0x59 > > [ 0.142393] acpi_ns_delete_namespace_subtree+0x5c/0x79 > > [ 0.142393] ? acpi_sleep_proc_init+0x1f/0x1f > > [ 0.142393] acpi_ns_terminate+0xc/0x31 > > [ 0.142393] acpi_ut_subsystem_shutdown+0x45/0xa3 > > [ 0.142393] ? acpi_sleep_proc_init+0x1f/0x1f > > [ 0.142393] acpi_terminate+0x5/0xf > > [ 0.142393] acpi_init+0x27b/0x308 > > [ 0.142393] ? video_setup+0x79/0x79 > > [ 0.142393] do_one_initcall+0x7b/0x160 > > [ 0.142393] kernel_init_freeable+0x190/0x1f2 > > [ 0.142393] ? rest_init+0x9a/0x9a > > [ 0.142393] kernel_init+0x5/0xf6 > > [ 0.142393] ret_from_fork+0x22/0x30 > > [ 0.142393] ---[ end trace 3539f236ef812ba1 ]--- > > [ 0.142396] ------------[ cut here ]------------ > > > > I've also changed the warning so it's not printed just once, and also > > prints tracking info (see the hunk at the end of my mail, I'll turn this to a > proper patch later). > > > > With "slub_debug=FU slub_nomerge" there are now multiple warnings, > but they all look the same: > > > > [ 0.143815] ------------[ cut here ]------------ > > [ 0.144131] cache_from_obj: Wrong slab cache. Acpi-Namespace but > object is from kmalloc-64 > > [ 0.144929] WARNING: CPU: 0 PID: 1 at mm/slab.h:524 > kmem_cache_free+0x1d3/0x250 > > [ 0.145129] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.7.0+ #45 > > [ 0.145129] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), > BIOS rel-1.13.0-0-gf21b5a4-rebuilt.opensuse.org 04/01/2014 > > [ 0.145129] RIP: 0010:kmem_cache_free+0x1d3/0x250 > > [ 0.145129] Code: 18 4d 85 ed 0f 84 10 ff ff ff 4c 39 ed 74 2f 49 8b 4d 58 48 > 8b 55 58 48 c7 c6 10 47 c1 8d 48 c7 c7 00 c2 d0 8d e8 b1 cc eb ff <0f> 0b 48 89 de > 4c 89 ef e8 10 d7 ff ff 48 8b 15 59 36 9b 00 4c 89 > > [ 0.145129] RSP: 0018:ffff990b80013dc0 EFLAGS: 00010282 > > [ 0.145129] RAX: 0000000000000000 RBX: ffff972d474ada80 RCX: > 0000000000000000 > > [ 0.145129] RDX: 0000000000000001 RSI: 0000000000000092 RDI: > ffffffff8e1dd32c > > [ 0.145129] RBP: ffff972d47425680 R08: ffff990b80013c7d R09: > 00000000000000fc > > [ 0.145129] R10: ffff990b80013c78 R11: ffff990b80013c7d R12: > ffff972dc74ada80 > > [ 0.145129] R13: ffff972d474038c0 R14: 0000000000000000 R15: > 0000000000000000 > > [ 0.145129] FS: 0000000000000000(0000) GS:ffff972d47a00000(0000) > knlGS:0000000000000000 > > [ 0.145129] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > [ 0.145129] CR2: 0000000000000000 CR3: 000000000660a000 CR4: > 00000000003406f0 > > [ 0.145129] Call Trace: > > [ 0.145129] acpi_os_release_object+0x5/0x10 > > [ 0.145129] acpi_ns_delete_children+0x46/0x59 > > [ 0.145129] acpi_ns_delete_namespace_subtree+0x5c/0x79 > > [ 0.145129] ? acpi_sleep_proc_init+0x1f/0x1f > > [ 0.145129] acpi_ns_terminate+0xc/0x31 > > [ 0.145129] acpi_ut_subsystem_shutdown+0x45/0xa3 > > [ 0.145129] ? acpi_sleep_proc_init+0x1f/0x1f > > [ 0.145129] acpi_terminate+0x5/0xf > > [ 0.145129] acpi_init+0x27b/0x308 > > [ 0.145129] ? video_setup+0x79/0x79 > > [ 0.145129] do_one_initcall+0x7b/0x160 > > [ 0.145129] kernel_init_freeable+0x190/0x1f2 > > [ 0.145129] ? rest_init+0x9a/0x9a > > [ 0.145129] kernel_init+0x5/0xf6 > > [ 0.145129] ret_from_fork+0x22/0x30 > > [ 0.145129] ---[ end trace 574554fca7bd06bb ]--- > > [ 0.145133] INFO: Allocated in acpi_ns_root_initialize+0xb6/0x2d1 age=58 > cpu=0 pid=0 > > [ 0.145881] kmem_cache_alloc_trace+0x1a9/0x1c0 > > [ 0.146132] acpi_ns_root_initialize+0xb6/0x2d1 > > [ 0.146578] acpi_initialize_subsystem+0x65/0xa8 > > [ 0.147024] acpi_early_init+0x5d/0xd1 > > [ 0.147132] start_kernel+0x45b/0x518 > > [ 0.147491] secondary_startup_64+0xb6/0xc0 > > [ 0.147897] ------------[ cut here ]------------ > > > > And it seems ACPI is allocating an object via kmalloc() and then > > freeing it via kmem_cache_free(<"Acpi-Namespace" kmem_cache>) which > is wrong. > > > >> ./scripts/faddr2line vmlinux 'acpi_ns_root_initialize+0xb6' > > acpi_ns_root_initialize+0xb6/0x2d1: > > kmalloc at include/linux/slab.h:555 > > (inlined by) kzalloc at include/linux/slab.h:669 (inlined by) > > acpi_os_allocate_zeroed at include/acpi/platform/aclinuxex.h:57 > > (inlined by) acpi_ns_root_initialize at > > drivers/acpi/acpica/nsaccess.c:102 > > > Hi, > That's it :-) This fixes it for me: I've tried this and it's working on my end. Bob, any thoughts? Erik > > diff --git a/drivers/acpi/acpica/nsaccess.c b/drivers/acpi/acpica/nsaccess.c > index 2566e2d4c7803..b76bbab917941 100644 > --- a/drivers/acpi/acpica/nsaccess.c > +++ b/drivers/acpi/acpica/nsaccess.c > @@ -98,14 +98,12 @@ acpi_status acpi_ns_root_initialize(void) > * predefined names are at the root level. It is much easier to > * just create and link the new node(s) here. > */ > - new_node = > - ACPI_ALLOCATE_ZEROED(sizeof(struct > acpi_namespace_node)); > + new_node = acpi_ns_create_node(*ACPI_CAST_PTR (u32, > init_val->name)); > if (!new_node) { > status = AE_NO_MEMORY; > goto unlock_and_exit; > } > > - ACPI_COPY_NAMESEG(new_node->name.ascii, init_val->name); > new_node->descriptor_type = ACPI_DESC_TYPE_NAMED; > new_node->type = init_val->type; > > > Vegard
