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Date: Wed, 13 Jul 2016 10:57:32 +0200
From: Alexander Potapenko <glider@...gle.com>
To: kernel test robot <xiaolong.ye@...el.com>
Cc: 0day robot <fengguang.wu@...el.com>,
LKML <linux-kernel@...r.kernel.org>, lkp@...org,
Dmitriy Vyukov <dvyukov@...gle.com>
Subject: Re: [lkp] [mm, kasan] 7392becb25: BUG: KASAN: slab-out-of-bounds in
bucket_table_alloc+0x79/0x1a0 at addr ffff88003e400000
Hello there,
I've built my kernel with the supplied config, but haven't managed to
reproduce the failure.
The test prints the following log:
[ 2.554919] Testing concurrent rhashtable access from 10 threads
[ 3.295575] thread[4]: rhashtable_insert_fast failed
[ 3.296065] thread[9]: rhashtable_insert_fast failed
[ 3.296491] thread[0]: rhashtable_insert_fast failed
[ 3.296948] Test failed: thread 0 returned: -12
[ 3.297375] thread[5]: rhashtable_insert_fast failed
[ 7.843544] Test failed: thread 4 returned: -12
[ 7.844341] Test failed: thread 5 returned: -12
[ 7.859334] Test failed: thread 9 returned: -12
[ 7.859772] Started 10 threads, 4 failed
Soon after that the kernel panics for an unrelated reason:
[ 75.812970] Kernel panic - not syncing: No working init found. Try
passing init= option to kernel. See Linux Documentation/init.txt for
guidance.
[ 75.814048] CPU: 0 PID: 1 Comm: swapper Not tainted
4.7.0-rc7-00020-g4543d2b #1091
[ 75.814749] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS Bochs 01/01/2011
[ 75.815465] 0000000000000000 ffff88000010fe60 ffffffff812cd2d4
ffff88000010ff28
[ 75.816140] ffffffff811741f5 0000000041b58ab3 ffffffff8292ea1d
ffffffff811740ba
[ 75.816787] ffff8800170e615c ffffffff00000008 ffff88000010ff38
ffff88000010fed0
[ 75.817426] Call Trace:
[ 75.817659] [<ffffffff812cd2d4>] dump_stack+0x19/0x1b
[ 75.818126] [<ffffffff811741f5>] panic+0x13b/0x27a
[ 75.818517] [<ffffffff811740ba>] ? phys_to_pfn_t+0x1d/0x1d
[ 75.818960] [<ffffffff81f8ae4a>] kernel_init+0xf4/0xfb
[ 75.819376] [<ffffffff81f9abef>] ret_from_fork+0x1f/0x40
[ 75.819804] [<ffffffff81f8ad56>] ? rest_init+0x13d/0x13d
[ 75.820008] Kernel Offset: disabled
[ 75.820008] ---[ end Kernel panic - not syncing: No working init
found. Try passing init= option to kernel. See Linux
Documentation/init.txt for guidance.
I'm using the following commandline to run QEMU:
$ sudo qemu-system-x86_64 -hda ${THISDIR}/wheezy.img -m 500M -smp 2
-net user,hostfwd=tcp:127.0.0.1:10025-:22 -net nic \
-kernel $KASAN_SRC_DIR/arch/x86/boot/bzImage \
-append "console=ttyS0 root=/dev/sda debug
earlyprintk=serial slub_debug=FPZU" \
-nographic -pidfile vm_pid -enable-kvm -s # -S
-gdb unix:gdb,server,nowait
I have also built test_rhashtable.c as module and tried to load/unload
it many times in a row, but the report didn't reproduce for me either.
If it's still reproducible, may I ask you to run the output through
https://github.com/google/sanitizers/blob/master/address-sanitizer/tools/kasan_symbolize.py
?
TIA,
Alex
On Wed, Jul 13, 2016 at 3:29 AM, kernel test robot
<xiaolong.ye@...el.com> wrote:
>
> FYI, we noticed the following commit:
>
> https://github.com/0day-ci/linux Alexander-Potapenko/mm-kasan-switch-SLUB-to-stackdepot-enable-memory-quarantine-for-SLUB/20160708-183858
> commit 7392becb255cd6c0e7bedaabd58f638b732772f2 ("mm, kasan: switch SLUB to stackdepot, enable memory quarantine for SLUB")
>
> in testcase: boot
>
> on test machine: 2 threads qemu-system-x86_64 -enable-kvm -cpu Haswell,+smep,+smap with 1G memory
>
> caused below changes:
>
>
> +-----------------------------------------------------------------------------------------+----------+------------+
> | | v4.7-rc6 | 7392becb25 |
> +-----------------------------------------------------------------------------------------+----------+------------+
> | boot_successes | 0 | 0 |
> | boot_failures | 61 | 36 |
> | BUG:workqueue_lockup-pool | 58 | 14 |
> | BUG:workqueue_lockup-pool_cpus=#cpus=#node=#node=#flags=#nice=#flags=#nice=#stuck_for#s | 58 | 14 |
> | BUG:workqueue_lockup-pool_cpus=#cpus=#flags=#nice=#flags=#nice=#stuck_for#s | 12 | 1 |
> | Kernel_panic-not_syncing:Attempted_to_kill_init!exitcode= | 9 | |
> | BUG:KASAN:slab-out-of-bounds_in_bucket_table_alloc_at_addr | 0 | 22 |
> | backtrace:threadfunc | 0 | 22 |
> | BUG:KASAN:slab-out-of-bounds_in | 0 | 1 |
> +-----------------------------------------------------------------------------------------+----------+------------+
>
>
>
> [ 22.095742] Testing concurrent rhashtable access from 10 threads
> [ 22.756188] ==================================================================
> [ 22.756188] ==================================================================
> [ 22.759097] BUG: KASAN: slab-out-of-bounds in bucket_table_alloc+0x79/0x1a0 at addr ffff88003e400000
> [ 22.759097] BUG: KASAN: slab-out-of-bounds in bucket_table_alloc+0x79/0x1a0 at addr ffff88003e400000
> [ 22.762225] Write of size 4 by task rhashtable_thra/165
> [ 22.762225] Write of size 4 by task rhashtable_thra/165
> [ 22.764303] CPU: 0 PID: 165 Comm: rhashtable_thra Not tainted 4.7.0-rc6-00001-g7392bec #1
> [ 22.764303] CPU: 0 PID: 165 Comm: rhashtable_thra Not tainted 4.7.0-rc6-00001-g7392bec #1
> [ 22.766875] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
> [ 22.766875] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
> [ 22.769722] 0000000000000000
> [ 22.769722] 0000000000000000 ffff8800165f7be8 ffff8800165f7be8 ffffffff812cd64c ffffffff812cd64c ffff8800165f7c58 ffff8800165f7c58
>
> [ 22.772033] ffffffff811c4b96
> [ 22.772033] ffffffff811c4b96 ffffffff812ec3c8 ffffffff812ec3c8 0000000000000246 0000000000000246 ffff880000082300 ffff880000082300
>
> [ 22.774265] 0000000002089220
> [ 22.774265] 0000000002089220 0000000002089220 0000000002089220 ffff8800165f7c68 ffff8800165f7c68 ffffffff811c2379 ffffffff811c2379
>
> [ 22.776571] Call Trace:
> [ 22.776571] Call Trace:
> [ 22.777355] [<ffffffff812cd64c>] dump_stack+0x19/0x1b
> [ 22.777355] [<ffffffff812cd64c>] dump_stack+0x19/0x1b
> [ 22.779220] [<ffffffff811c4b96>] kasan_report+0x2d7/0x4ed
> [ 22.779220] [<ffffffff811c4b96>] kasan_report+0x2d7/0x4ed
> [ 22.780862] [<ffffffff812ec3c8>] ? bucket_table_alloc+0x79/0x1a0
> [ 22.780862] [<ffffffff812ec3c8>] ? bucket_table_alloc+0x79/0x1a0
> [ 22.782668] [<ffffffff811c2379>] ? __kmalloc+0x177/0x1b0
> [ 22.782668] [<ffffffff811c2379>] ? __kmalloc+0x177/0x1b0
> [ 22.784273] [<ffffffff811c46b0>] __asan_store4+0x6e/0x70
> [ 22.784273] [<ffffffff811c46b0>] __asan_store4+0x6e/0x70
> [ 22.785885] [<ffffffff812ec3c8>] bucket_table_alloc+0x79/0x1a0
> [ 22.785885] [<ffffffff812ec3c8>] bucket_table_alloc+0x79/0x1a0
> [ 22.787660] [<ffffffff812ecfb7>] rhashtable_insert_rehash+0xc0/0x13f
> [ 22.787660] [<ffffffff812ecfb7>] rhashtable_insert_rehash+0xc0/0x13f
> [ 22.789577] [<ffffffff812f15d5>] insert_retry+0x2fa/0x5bc
> [ 22.789577] [<ffffffff812f15d5>] insert_retry+0x2fa/0x5bc
> [ 22.791705] [<ffffffff81101f19>] ? trace_hardirqs_on+0xd/0xf
> [ 22.791705] [<ffffffff81101f19>] ? trace_hardirqs_on+0xd/0xf
> [ 22.793425] [<ffffffff812f195f>] threadfunc+0xc8/0x68c
> [ 22.793425] [<ffffffff812f195f>] threadfunc+0xc8/0x68c
> [ 22.794987] [<ffffffff81f92dbe>] ? __schedule+0x5fe/0x73f
> [ 22.794987] [<ffffffff81f92dbe>] ? __schedule+0x5fe/0x73f
> [ 22.796629] [<ffffffff812f1897>] ? insert_retry+0x5bc/0x5bc
> [ 22.796629] [<ffffffff812f1897>] ? insert_retry+0x5bc/0x5bc
> [ 22.798810] [<ffffffff810e5c55>] kthread+0x18d/0x19c
> [ 22.798810] [<ffffffff810e5c55>] kthread+0x18d/0x19c
> [ 22.800319] [<ffffffff810e5ac8>] ? __kthread_parkme+0xb0/0xb0
> [ 22.800319] [<ffffffff810e5ac8>] ? __kthread_parkme+0xb0/0xb0
> [ 22.802048] [<ffffffff810ea54c>] ? finish_task_switch+0x1ac/0x224
> [ 22.802048] [<ffffffff810ea54c>] ? finish_task_switch+0x1ac/0x224
> [ 22.804976] [<ffffffff81f9986f>] ret_from_fork+0x1f/0x40
> [ 22.804976] [<ffffffff81f9986f>] ret_from_fork+0x1f/0x40
> [ 22.807662] [<ffffffff810e5ac8>] ? __kthread_parkme+0xb0/0xb0
> [ 22.807662] [<ffffffff810e5ac8>] ? __kthread_parkme+0xb0/0xb0
> [ 22.810556] Object at ffff88003e400000, in cache kmalloc-4194304
> [ 22.810556] Object at ffff88003e400000, in cache kmalloc-4194304
> [ 22.813231] Memory state around the buggy address:
>
>
> FYI, raw QEMU command line is:
>
> qemu-system-x86_64 -enable-kvm -cpu Haswell,+smep,+smap -kernel /pkg/linux/x86_64-randconfig-s2-07120443/gcc-6/7392becb255cd6c0e7bedaabd58f638b732772f2/vmlinuz-4.7.0-rc6-00001-g7392bec -append 'root=/dev/ram0 user=lkp job=/lkp/scheduled/vm-kbuild-1G-5/bisect_boot-1-debian-x86_64-2015-02-07.cgz-x86_64-randconfig-s2-07120443-7392becb255cd6c0e7bedaabd58f638b732772f2-20160712-21427-xipcnl-0.yaml ARCH=x86_64 kconfig=x86_64-randconfig-s2-07120443 branch=linux-devel/devel-spot-201607120350 commit=7392becb255cd6c0e7bedaabd58f638b732772f2 BOOT_IMAGE=/pkg/linux/x86_64-randconfig-s2-07120443/gcc-6/7392becb255cd6c0e7bedaabd58f638b732772f2/vmlinuz-4.7.0-rc6-00001-g7392bec max_uptime=600 RESULT_ROOT=/result/boot/1/vm-kbuild-1G/debian-x86_64-2015-02-07.cgz/x86_64-randconfig-s2-07120443/gcc-6/7392becb255cd6c0e7bedaabd58f638b732772f2/0 LKP_SERVER=inn earlyprintk=ttyS0,115200 systemd.log_level=err 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 console=ttyS0,115200 console=tty0 vga=normal rw ip=::::vm-kbuild-1G-5::dhcp' -initrd /fs/sdg1/initrd-vm-kbuild-1G-5 -m 1024 -smp 2 -device e1000,netdev=net0 -netdev user,id=net0,hostfwd=tcp::23004-:22 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -device virtio-scsi-pci,id=scsi0 -drive file=/fs/sdg1/disk0-vm-kbuild-1G-5,if=none,id=hd0,media=disk,aio=native,cache=none -device scsi-hd,bus=scsi0.0,drive=hd0,scsi-id=1,lun=0 -drive file=/fs/sdg1/disk1-vm-kbuild-1G-5,if=none,id=hd1,media=disk,aio=native,cache=none -device scsi-hd,bus=scsi0.0,drive=hd1,scsi-id=1,lun=1 -drive file=/fs/sdg1/disk2-vm-kbuild-1G-5,if=none,id=hd2,media=disk,aio=native,cache=none -device scsi-hd,bus=scsi0.0,drive=hd2,scsi-id=1,lun=2 -drive file=/fs/sdg1/disk3-vm-kbuild-1G-5,if=none,id=hd3,media=disk,aio=native,cache=none -device scsi-hd,bus=scsi0.0,drive=hd3,scsi-id=1,lun=3 -drive file=/fs/sdg1/disk4-vm-kbuild-1G-5,if=none,id=hd4,media=disk,aio=native,cache=none -device scsi-hd,bus=scsi0.0,drive=hd4,scsi-id=1,lun=4 -pidfile /dev/shm/kboot/pid-vm-kbuild-1G-5 -serial file:/dev/shm/kboot/serial-vm-kbuild-1G-5 -daemonize -display none -monitor null
>
>
>
>
>
> Thanks,
> Xiaolong
--
Alexander Potapenko
Software Engineer
Google Germany GmbH
Erika-Mann-Straße, 33
80636 München
Geschäftsführer: Matthew Scott Sucherman, Paul Terence Manicle
Registergericht und -nummer: Hamburg, HRB 86891
Sitz der Gesellschaft: Hamburg
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