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Date: Tue, 26 Jul 2016 10:15:51 +0800
From: kernel test robot <xiaolong.ye@...el.com>
To: Alexander Potapenko <glider@...gle.com>
Cc: Stephen Rothwell <sfr@...b.auug.org.au>,
Andrey Konovalov <adech.fo@...il.com>,
Christoph Lameter <cl@...ux.com>,
Dmitry Vyukov <dvyukov@...gle.com>,
Steven Rostedt <rostedt@...dmis.org>,
Joonsoo Kim <iamjoonsoo.kim@....com>,
Kostya Serebryany <kcc@...gle.com>,
Andrey Ryabinin <aryabinin@...tuozzo.com>,
Kuthonuzo Luruo <kuthonuzo.luruo@....com>,
Andrew Morton <akpm@...ux-foundation.org>,
LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: [lkp] [mm, kasan] a6efa0b2aa: Undefined behaviour in
mm/kasan/quarantine.c:102:13
FYI, we noticed the following commit:
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
commit a6efa0b2aa5568872abff95bfa7d8a4dba00f86f ("mm, kasan: switch SLUB to stackdepot, enable memory quarantine for SLUB")
in testcase: boot
on test machine: 1 threads qemu-system-x86_64 -enable-kvm -cpu SandyBridge with 320M memory
caused below changes:
7809 [ 18.666107] UBSAN: Undefined behaviour in mm/kasan/quarantine.c:102:13
7810 [ 18.668198] member access within misaligned address ffff88000d1efebc for type 'struct qlist_node'
7811 [ 18.670368] which requires 8 byte alignment
7812 [ 18.671494] CPU: 0 PID: 1 Comm: swapper Not tainted 4.7.0-rc7-00368-ga6efa0b #1
7813 [ 18.673400] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
7814 [ 18.675812] 0000000000000000 ffff88000d4af918 ffffffff81ac3c82 ffff88000d4af938
7815 [ 18.678219] ffffffff81b60046 000000000000001f ffffffff8370a6c0 ffff88000d4af9d8
7816 [ 18.680606] ffffffff81b60a2f ffffffff8370b44c 0000000041b58ab3 ffffffff82b6a7c6
7817 [ 18.683014] Call Trace:
7818 [ 18.683822] [<ffffffff81ac3c82>] dump_stack+0x19/0x1b
7819 [ 18.685112] [<ffffffff81b60046>] ubsan_epilogue+0xe/0x84
7820 [ 18.687650] [<ffffffff81b60a2f>] __ubsan_handle_type_mismatch+0x1e2/0x20a
7821 [ 18.689369] [<ffffffff81b6084d>] ? __ubsan_handle_divrem_overflow+0x16c/0x16c
7822 [ 18.691296] [<ffffffff81339dd2>] ? ___slab_alloc+0x710/0x93e
7823 [ 18.692941] [<ffffffff81ac781f>] ? idr_get_empty_slot+0xddf/0xddf
7824 [ 18.698603] [<ffffffff81343846>] quarantine_reduce+0x1d3/0x23f
7825 [ 18.700062] [<ffffffff81341ef4>] kasan_kmalloc+0x28/0x91
7826 [ 18.701428] [<ffffffff81341f6f>] kasan_slab_alloc+0x12/0x14
7827 [ 18.702846] [<ffffffff8133a3c4>] kmem_cache_alloc+0x334/0x451
7828 [ 18.704305] [<ffffffff81478c73>] ? __kernfs_new_node+0xa9/0x1ff
7829 [ 18.705794] [<ffffffff81478c73>] __kernfs_new_node+0xa9/0x1ff
7830 [ 18.707243] [<ffffffff81478bca>] ? kernfs_dop_revalidate+0x2c9/0x2c9
7831 [ 18.721888] [<ffffffff81ad541c>] ? rb_first+0x35/0x8c
7832 [ 18.723213] [<ffffffff81478843>] ? kernfs_leftmost_descendant+0x48/0x5b
7833 [ 18.724800] [<ffffffff8147c0a7>] kernfs_new_node+0xa0/0xe2
7834 [ 18.726201] [<ffffffff81480506>] __kernfs_create_file+0x33/0x19f
7835 [ 18.727704] [<ffffffff81482179>] sysfs_add_file_mode_ns+0x26c/0x3cd
7836 [ 18.729371] [<ffffffff81482505>] sysfs_add_file+0x50/0x57
7837 [ 18.730834] [<ffffffff81483ff0>] sysfs_merge_group+0x109/0x1d4
7838 [ 18.748017] [<ffffffff81dd60bc>] dpm_sysfs_add+0x9e/0x13e
7839 [ 18.749196] [<ffffffff81dbb549>] device_add+0xa66/0x1034
7840 [ 18.750342] [<ffffffff81dbaae3>] ? device_private_init+0x1e9/0x1e9
7841 [ 18.751629] [<ffffffff81db7eac>] ? device_create_file+0x155/0x155
7842 [ 18.752898] [<ffffffff8133a926>] ? kmem_cache_alloc_trace+0x445/0x457
7843 [ 18.754233] [<ffffffff81dc09d3>] ? subsys_register+0x3d/0x168
7844 [ 18.755544] [<ffffffff81dbbb31>] device_register+0x1a/0x1d
7845 [ 18.756717] [<ffffffff81dc0a97>] subsys_register+0x101/0x168
7846 [ 18.758022] [<ffffffff81dc3561>] subsys_system_register+0x34/0x3a
7847 [ 18.759308] [<ffffffff86c85359>] ? edac_mc_sysfs_init+0xcf/0xcf
7848 [ 18.769681] [<ffffffff86c85378>] edac_init+0x1f/0x70
7849 [ 18.779343] [<ffffffff81000597>] do_one_initcall+0x14e/0x200
7850 [ 18.780772] [<ffffffff81000449>] ? initcall_blacklisted+0x146/0x146
7851 [ 18.790449] [<ffffffff8114c800>] ? remove_wait_queue+0x154/0x1ca
7852 [ 18.791916] [<ffffffff8112f59a>] ? preempt_count_sub+0x18/0xd9
7853 [ 18.793370] [<ffffffff86c01a28>] kernel_init_freeable+0x2b8/0x34c
7854 [ 18.794868] [<ffffffff82580aba>] kernel_init+0x11/0x11b
7855 [ 18.796185] [<ffffffff8258becf>] ret_from_fork+0x1f/0x40
7856 [ 18.797540] [<ffffffff82580aa9>] ? rest_init+0x90/0x90
7857 [ 18.807610] ================================================================================
FYI, raw QEMU command line is:
qemu-system-x86_64 -enable-kvm -cpu SandyBridge -kernel /pkg/linux/x86_64-randconfig-s4-07242348/gcc-6/a6efa0b2aa5568872abff95bfa7d8a4dba00f86f/vmlinuz-4.7.0-rc7-00368-ga6efa0b -append 'root=/dev/ram0 user=lkp job=/lkp/scheduled/vm-kbuild-yocto-x86_64-59/boot-1-yocto-minimal-x86_64.cgz-a6efa0b2aa5568872abff95bfa7d8a4dba00f86f-20160725-6441-1w86cht-0.yaml ARCH=x86_64 kconfig=x86_64-randconfig-s4-07242348 branch=linux-next/master commit=a6efa0b2aa5568872abff95bfa7d8a4dba00f86f BOOT_IMAGE=/pkg/linux/x86_64-randconfig-s4-07242348/gcc-6/a6efa0b2aa5568872abff95bfa7d8a4dba00f86f/vmlinuz-4.7.0-rc7-00368-ga6efa0b max_uptime=600 RESULT_ROOT=/result/boot/1/vm-kbuild-yocto-x86_64/yocto-minimal-x86_64.cgz/x86_64-randconfig-s4-07242348/gcc-6/a6efa0b2aa5568872abff95bfa7d8a4dba00f86f/0 LKP_SERVER=inn debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 panic=-1 softlockup_panic=1 nmi_watchdog=panic oops=panic load_ramdisk=2 prompt_ramdisk=0 systemd.log_level=err ignore_loglevel earlyprintk=ttyS0,115200 console=ttyS0,115200 console=tty0 vga=normal rw ip=::::vm-kbuild-yocto-x86_64-59::dhcp drbd.minor_count=8' -initrd /fs/sdg1/initrd-vm-kbuild-yocto-x86_64-59 -m 320 -smp 1 -device e1000,netdev=net0 -netdev user,id=net0 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -drive file=/fs/sdg1/disk0-vm-kbuild-yocto-x86_64-59,media=disk,if=virtio -pidfile /dev/shm/kboot/pid-vm-kbuild-yocto-x86_64-59 -serial file:/dev/shm/kboot/serial-vm-kbuild-yocto-x86_64-59 -daemonize -display none -monitor null
Thanks,
Xiaolong
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