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Date: Sun, 31 Jul 2022 16:16:25 +0800
From: Feng Tang <feng.tang@...el.com>
To: "Sang, Oliver" <oliver.sang@...el.com>
CC: lkp <lkp@...el.com>, Vlastimil Babka <vbabka@...e.cz>,
LKML <linux-kernel@...r.kernel.org>,
"linux-mm@...ck.org" <linux-mm@...ck.org>,
"lkp@...ts.01.org" <lkp@...ts.01.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Christoph Lameter <cl@...ux.com>,
Pekka Enberg <penberg@...nel.org>,
David Rientjes <rientjes@...gle.com>,
Joonsoo Kim <iamjoonsoo.kim@....com>,
Roman Gushchin <roman.gushchin@...ux.dev>,
Hyeonggon Yoo <42.hyeyoo@...il.com>,
"Hansen, Dave" <dave.hansen@...el.com>,
Robin Murphy <robin.murphy@....com>,
John Garry <john.garry@...wei.com>,
Kefeng Wang <wangkefeng.wang@...wei.com>
Subject: Re: [mm/slub] 3616799128:
BUG_kmalloc-#(Not_tainted):kmalloc_Redzone_overwritten
Hi Oliver,
On Sun, Jul 31, 2022 at 02:53:17PM +0800, Sang, Oliver wrote:
>
>
> Greeting,
>
> FYI, we noticed the following commit (built with gcc-11):
>
> commit: 3616799128612e04ed919579e2c7b0dccf6bcb00 ("[PATCH v3 3/3] mm/slub: extend redzone check to cover extra allocated kmalloc space than requested")
> url: https://github.com/intel-lab-lkp/linux/commits/Feng-Tang/mm-slub-some-debug-enhancements/20220727-151318
> base: git://git.kernel.org/cgit/linux/kernel/git/vbabka/slab.git for-next
> patch link: https://lore.kernel.org/linux-mm/20220727071042.8796-4-feng.tang@intel.com
>
> in testcase: boot
>
> on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G
>
> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
>
>
> If you fix the issue, kindly add following tag
> Reported-by: kernel test robot <oliver.sang@...el.com>
>
>
> [ 50.637839][ T154] =============================================================================
> [ 50.639937][ T154] BUG kmalloc-16 (Not tainted): kmalloc Redzone overwritten
> [ 50.641291][ T154] -----------------------------------------------------------------------------
> [ 50.641291][ T154]
> [ 50.643617][ T154] 0xffff88810018464c-0xffff88810018464f @offset=1612. First byte 0x7 instead of 0xcc
> [ 50.645311][ T154] Allocated in __sdt_alloc+0x258/0x457 age=14287 cpu=0 pid=1
> [ 50.646584][ T154] ___slab_alloc+0x52b/0x5b6
> [ 50.647411][ T154] __slab_alloc+0x1a/0x22
> [ 50.648374][ T154] __kmalloc_node+0x10c/0x1e1
> [ 50.649237][ T154] __sdt_alloc+0x258/0x457
> [ 50.650060][ T154] build_sched_domains+0xae/0x10e8
> [ 50.650981][ T154] sched_init_smp+0x30/0xa5
> [ 50.651805][ T154] kernel_init_freeable+0x1c6/0x23b
> [ 50.652767][ T154] kernel_init+0x14/0x127
> [ 50.653594][ T154] ret_from_fork+0x1f/0x30
> [ 50.654414][ T154] Slab 0xffffea0004006100 objects=28 used=28 fp=0x0000000000000000 flags=0x1fffc0000000201(locked|slab|node=0|zone=1|lastcpupid=0x3fff)
> [ 50.656866][ T154] Object 0xffff888100184640 @offset=1600 fp=0xffff888100184520
> [ 50.656866][ T154]
> [ 50.658410][ T154] Redzone ffff888100184630: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc ................
> [ 50.660047][ T154] Object ffff888100184640: 00 32 80 00 81 88 ff ff 01 00 00 00 07 00 80 8a .2..............
> [ 50.661837][ T154] Redzone ffff888100184650: cc cc cc cc cc cc cc cc ........
> [ 50.663454][ T154] Padding ffff8881001846b4: 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZ
> [ 50.665225][ T154] CPU: 0 PID: 154 Comm: systemd-udevd Not tainted 5.19.0-rc5-00010-g361679912861 #1
> [ 50.666861][ T154] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-debian-1.16.0-4 04/01/2014
> [ 50.668694][ T154] Call Trace:
> [ 50.669331][ T154] <TASK>
> [ 50.669832][ T154] dump_stack_lvl+0x57/0x7d
> [ 50.670601][ T154] check_bytes_and_report+0xca/0xfe
> [ 50.671436][ T154] check_object+0xdc/0x24d
> [ 50.672163][ T154] free_debug_processing+0x98/0x210
> [ 50.673904][ T154] __slab_free+0x46/0x198
> [ 50.675746][ T154] qlist_free_all+0xae/0xde
> [ 50.676552][ T154] kasan_quarantine_reduce+0x10d/0x145
> [ 50.677507][ T154] __kasan_slab_alloc+0x1c/0x5a
> [ 50.678327][ T154] slab_post_alloc_hook+0x5a/0xa2
> [ 50.680069][ T154] kmem_cache_alloc+0x102/0x135
> [ 50.680938][ T154] getname_flags+0x4b/0x314
> [ 50.681781][ T154] do_sys_openat2+0x7a/0x15c
> [ 50.706848][ T154] Disabling lock debugging due to kernel taint
> [ 50.707913][ T154] FIX kmalloc-16: Restoring kmalloc Redzone 0xffff88810018464c-0xffff88810018464f=0xcc
Thanks for the report!
>From the log it happened when kasan is enabled, and my first guess is
the data processing from kmalloc redzone handling had some conflict
with kasan's in allocation path (though I tested some kernel config
with KASAN enabled)
Will study more about kasan and reproduce/debug this. thanks
- Feng
>
> To reproduce:
>
> # build kernel
> cd linux
> cp config-5.19.0-rc5-00010-g361679912861 .config
> make HOSTCC=gcc-11 CC=gcc-11 ARCH=x86_64 olddefconfig prepare modules_prepare bzImage modules
> make HOSTCC=gcc-11 CC=gcc-11 ARCH=x86_64 INSTALL_MOD_PATH=<mod-install-dir> modules_install
> cd <mod-install-dir>
> find lib/ | cpio -o -H newc --quiet | gzip > modules.cgz
>
>
> git clone https://github.com/intel/lkp-tests.git
> cd lkp-tests
> bin/lkp qemu -k <bzImage> -m modules.cgz job-script # job-script is attached in this email
>
> # if come across any failure that blocks the test,
> # please remove ~/.lkp and /lkp dir to run from a clean state.
>
>
>
> --
> 0-DAY CI Kernel Test Service
> https://01.org/lkp
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