Message-ID: <CAG_fn=UVO9w+BSJ=riobmNEOF3u+SU3W41i4Z8-qbTFs+UnUAQ@mail.gmail.com>
Date:	Wed, 13 Jul 2016 10:58:20 +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>,
	Andrey Ryabinin <aryabinin@...tuozzo.com>,
	Joonsoo Kim <js1304@...il.com>
Subject: Re: [lkp] [mm, kasan] 7392becb25: BUG: KASAN: slab-out-of-bounds in
 bucket_table_alloc+0x79/0x1a0 at addr ffff88003e400000

Andrey, Joonsoo: FYI

On Wed, Jul 13, 2016 at 10:57 AM, Alexander Potapenko <glider@...gle.com> wrote:
> 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



-- 
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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