linux-kernel - [mm/slub] 3616799128: BUG_kmalloc-#(Not_tainted):kmalloc_Redzone

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Date:   Sun, 31 Jul 2022 14:53:17 +0800
From:   kernel test robot <oliver.sang@...el.com>
To:     Feng Tang <feng.tang@...el.com>
CC:     0day robot <lkp@...el.com>, Vlastimil Babka <vbabka@...e.cz>,
        LKML <linux-kernel@...r.kernel.org>, <linux-mm@...ck.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>,
        Dave Hansen <dave.hansen@...el.com>,
        Robin Murphy <robin.murphy@....com>,
        John Garry <john.garry@...wei.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Feng Tang <feng.tang@...el.com>
Subject: [mm/slub]  3616799128:
 BUG_kmalloc-#(Not_tainted):kmalloc_Redzone_overwritten



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
[   50.673036][  T154]  ? qlist_free_all+0x90/0xde
[   50.673904][  T154]  __slab_free+0x46/0x198
[   50.674660][  T154]  ? lockdep_hardirqs_on_prepare+0x32d/0x34e
[   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
[   50.679249][  T154]  ? getname_flags+0x4b/0x314
[   50.680069][  T154]  kmem_cache_alloc+0x102/0x135
[   50.680938][  T154]  getname_flags+0x4b/0x314
[   50.681781][  T154]  do_sys_openat2+0x7a/0x15c
[   50.682624][  T154]  ? build_open_flags+0x324/0x324
[   50.683522][  T154]  ? __lock_release+0xe8/0x367
[   50.684407][  T154]  do_sys_open+0x6b/0x83
[   50.685225][  T154]  ? file_open_root+0xbf/0xbf
[   50.686093][  T154]  do_syscall_64+0x6e/0x82
[   50.686895][  T154]  ? lockdep_hardirqs_on_prepare+0x32d/0x34e
[   50.688007][  T154]  ? do_syscall_64+0x7c/0x82
[   50.688859][  T154]  ? rcu_read_lock_sched_held+0x60/0x98
[   50.689780][  T154]  ? lockdep_hardirqs_on_prepare+0x32d/0x34e
[   50.690766][  T154]  ? do_syscall_64+0x7c/0x82
[   50.691591][  T154]  ? lockdep_hardirqs_on_prepare+0x32d/0x34e
[   50.692521][  T154]  entry_SYSCALL_64_after_hwframe+0x46/0xb0
[   50.693535][  T154] RIP: 0033:0x7f60f7d2a767
[   50.694372][  T154] Code: 25 00 00 41 00 3d 00 00 41 00 74 47 64 8b 04 25 18 00 00 00 85 c0 75 6b 44 89 e2 48 89 ee bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 95 00 00 00 48 8b 4c 24 28 64 48 2b 0c 25
[   50.697786][  T154] RSP: 002b:00007ffe8d6644b0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
[   50.699213][  T154] RAX: ffffffffffffffda RBX: 00007f60f77916c0 RCX: 00007f60f7d2a767
[   50.700601][  T154] RDX: 00000000000800c1 RSI: 000056320c6d0431 RDI: 00000000ffffff9c
[   50.702019][  T154] RBP: 000056320c6d0431 R08: 000056320cec9d30 R09: 00007f60f7c90e20
[   50.703408][  T154] R10: 00000000000001a4 R11: 0000000000000246 R12: 00000000000800c1
[   50.704860][  T154] R13: 000056320c6d0431 R14: 00000000ffffffff R15: 00007ffe8d6645b8
[   50.706282][  T154]  </TASK>
[   50.706848][  T154] Disabling lock debugging due to kernel taint
[   50.707913][  T154] FIX kmalloc-16: Restoring kmalloc Redzone 0xffff88810018464c-0xffff88810018464f=0xcc



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



View attachment "config-5.19.0-rc5-00010-g361679912861" of type "text/plain" (133440 bytes)

View attachment "job-script" of type "text/plain" (4946 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (70772 bytes)