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t=1659255434; a=rsa-sha256; cv=fail; b=51daGcrkAYLHcjB6gUK3lqN0AHd7XEiISwU9XSFpwetjh8UGFLIagTsL0qFK23WkRrL2QT lpx92pcJE8q6V6uj69lO0p1DUqLRZIv6fEIh3AtF0yzUlDQRngoCOwi750VPATMogN5twB SwVQdgth47XFVRVDMYHnL/0SV1YiffI= X-Rspam-User: X-Stat-Signature: fsoh7mqgkp5ys471qcyuosp3yqqtxups X-Rspamd-Queue-Id: 00BC4C00BE Authentication-Results: imf22.hostedemail.com; dkim=none ("invalid DKIM record") header.d=intel.com header.s=Intel header.b=ZeEpDQMS; arc=reject ("signature check failed: fail, {[1] = sig:microsoft.com:reject}"); spf=pass (imf22.hostedemail.com: domain of feng.tang@intel.com designates 192.55.52.88 as permitted sender) smtp.mailfrom=feng.tang@intel.com; dmarc=pass (policy=none) header.from=intel.com X-Rspamd-Server: rspam08 X-HE-Tag: 1659255432-146695 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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 > > > [ 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] > [ 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= modules_install > cd > 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 -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