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Date: Wed, 11 Aug 2021 17:02:17 +0800 (GMT+08:00)
From: 王擎 <wangqing@...o.com>
To: kernel test robot <oliver.sang@...el.com>
Cc: Tejun Heo <tj@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
lkp@...ts.01.org, lkp@...el.com
Subject: Re:[workqueue/watchdog] 89e28ce60c: BUG:KCSAN:data-race_in_wq_watchdog_touch/wq_watchdog_touch
Because jiffies are gradual, it does not matter if there is data-race in the assignment, and no modification is required.
Thanks,
Qing
From: kernel test robot <oliver.sang@...el.com>
Date: 2021-08-09 14:11:21
To: Wang Qing <wangqing@...o.com>
Cc: Tejun Heo <tj@...nel.org>,LKML <linux-kernel@...r.kernel.org>,lkp@...ts.01.org,lkp@...el.com
Subject: [workqueue/watchdog] 89e28ce60c: BUG:KCSAN:data-race_in_wq_watchdog_touch/wq_watchdog_touch>
>
>Greeting,
>
>FYI, we noticed the following commit (built with clang-14):
>
>commit: 89e28ce60cb65971c73359c66d076aa20a395cd5 ("workqueue/watchdog: Make unbound workqueues aware of touch_softlockup_watchdog()")
>https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
>
>
>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>
>
>
>[ 0.322292][ T1] BUG: KCSAN: data-race in wq_watchdog_touch / wq_watchdog_touch
>[ 0.322292][ T1]
>[ 0.322292][ T1] write to 0xffffffff8346e680 of 8 bytes by task 0 on cpu 1:
>[ 0.322292][ T1] wq_watchdog_touch (kernel/workqueue.c:5825)
>[ 0.322292][ T1] touch_softlockup_watchdog (kernel/watchdog.c:265)
>[ 0.322292][ T1] check_tsc_warp (arch/x86/kernel/tsc_sync.c:265)
>[ 0.322292][ T1] check_tsc_sync_target (arch/x86/kernel/tsc_sync.c:438)
>[ 0.322292][ T1] start_secondary (arch/x86/kernel/smpboot.c:251)
>[ 0.322292][ T1] secondary_startup_64_no_verify (arch/x86/kernel/head_64.S:283)
>[ 0.322292][ T1]
>[ 0.322292][ T1] write to 0xffffffff8346e680 of 8 bytes by task 1 on cpu 0:
>[ 0.322292][ T1] wq_watchdog_touch (kernel/workqueue.c:5825)
>[ 0.322292][ T1] touch_softlockup_watchdog (kernel/watchdog.c:265)
>[ 0.322292][ T1] check_tsc_warp (arch/x86/kernel/tsc_sync.c:265)
>[ 0.322292][ T1] check_tsc_sync_source (arch/x86/include/asm/atomic.h:29 include/asm-generic/atomic-instrumented.h:28 arch/x86/kernel/tsc_sync.c:348)
>[ 0.322292][ T1] native_cpu_up (arch/x86/kernel/smpboot.c:1191)
>[ 0.322292][ T1] bringup_cpu (arch/x86/include/asm/smp.h:87 kernel/cpu.c:568)
>[ 0.322292][ T1] cpuhp_invoke_callback (kernel/cpu.c:173)
>[ 0.322292][ T1] _cpu_up (kernel/cpu.c:623 kernel/cpu.c:1253)
>[ 0.322292][ T1] cpu_up (kernel/cpu.c:1288)
>[ 0.322292][ T1] bringup_nonboot_cpus (kernel/cpu.c:1350)
>[ 0.322292][ T1] smp_init (include/linux/bitmap.h:400 include/linux/nodemask.h:240 include/linux/nodemask.h:431 kernel/smp.c:816)
>[ 0.322292][ T1] kernel_init_freeable (init/main.c:1530)
>[ 0.322292][ T1] kernel_init (init/main.c:1426)
>[ 0.322292][ T1] ret_from_fork (arch/x86/entry/entry_64.S:300)
>[ 0.322292][ T1]
>[ 0.322292][ T1] Reported by Kernel Concurrency Sanitizer on:
>[ 0.322292][ T1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.12.0-rc5-00184-g89e28ce60cb6 #1
>[ 0.322292][ T1] ==================================================================
>[ 0.322599][ T14] kvm-guest: stealtime: cpu 1, msr 43fd2c0c0
>[ 0.325764][ T1] smp: Brought up 1 node, 2 CPUs
>[ 0.326291][ T1] smpboot: Max logical packages: 2
>[ 0.326786][ T1] smpboot: Total of 2 processors activated (9581.58 BogoMIPS)
>[ 0.408828][ T1] allocated 167772160 bytes of page_ext
>[ 0.416411][ T1] Node 0, zone DMA32: page owner found early allocated 8 pages
>[ 0.447668][ T1] Node 0, zone Normal: page owner found early allocated 41736 pages
>[ 0.449514][ T1] devtmpfs: initialized
>[ 0.450145][ T1] x86/mm: Memory block size: 128MB
>[ 0.480910][ T1] random: get_random_bytes called from setup_net+0x8d/0x5b9 with crng_init=0
>[ 0.483928][ T1] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 6370867519511994 ns
>[ 0.484997][ T1] futex hash table entries: 16 (order: -1, 2048 bytes, linear)
>[ 0.486443][ T1] pinctrl core: initialized pinctrl subsystem
>[ 0.488814][ T1] regulator-dummy: no parameters, enabled
>[ 0.490278][ T1] random: get_random_u32 called from rhashtable_init+0x3aa/0x570 with crng_init=0
>[ 0.490583][ T1] NET: Registered protocol family 16
>[ 0.495386][ T1] DMA: preallocated 2048 KiB GFP_KERNEL pool for atomic allocations
>[ 0.495880][ T1] DMA: preallocated 2048 KiB GFP_KERNEL|GFP_DMA32 pool for atomic allocations
>[ 0.498604][ T1] kcsan: selftest: 3/3 tests passed
>[ 0.501585][ T1] thermal_sys: Registered thermal governor 'step_wise'
>[ 0.501599][ T1] thermal_sys: Registered thermal governor 'user_space'
>[ 0.502576][ T1] cpuidle: using governor ladder
>[ 0.503839][ T1] cpuidle: using governor menu
>[ 0.506162][ T1] random: get_random_bytes called from kcmp_cookies_init+0x1d/0x67 with crng_init=0
>[ 0.506296][ T1] ACPI: bus type PCI registered
>[ 0.507650][ T1] PCI: Using configuration type 1 for base access
>[ 0.566045][ T1] HugeTLB registered 2.00 MiB page size, pre-allocated 0 pages
>[ 0.573158][ T1] cryptd: max_cpu_qlen set to 1000
>[ 0.593434][ T1] ACPI: Added _OSI(Module Device)
>[ 0.593928][ T1] ACPI: Added _OSI(Processor Device)
>[ 0.594443][ T1] ACPI: Added _OSI(3.0 _SCP Extensions)
>[ 0.594942][ T1] ACPI: Added _OSI(Processor Aggregator Device)
>[ 0.595723][ T1] ACPI: Added _OSI(Linux-Dell-Video)
>[ 0.596217][ T1] ACPI: Added _OSI(Linux-Lenovo-NV-HDMI-Audio)
>[ 0.596772][ T1] ACPI: Added _OSI(Linux-HPI-Hybrid-Graphics)
>[ 0.616486][ T1] ACPI: 1 ACPI AML tables successfully acquired and loaded
>[ 0.625174][ T1] ACPI: Interpreter enabled
>[ 0.625787][ T1] ACPI: (supports S0 S3 S5)
>[ 0.626322][ T1] ACPI: Using IOAPIC for interrupt routing
>[ 0.627026][ T1] PCI: Using host bridge windows from ACPI; if necessary, use "pci=nocrs" and report a bug
>[ 0.629847][ T1] ACPI: Enabled 2 GPEs in block 00 to 0F
>[ 0.682925][ T1] ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-ff])
>[ 0.683741][ T1] acpi PNP0A03:00: _OSC: OS supports [ASPM ClockPM Segments HPX-Type3]
>[ 0.684814][ T1] acpi PNP0A03:00: fail to add MMCONFIG information, can't access extended PCI configuration space under this bridge.
>[ 0.686520][ T1] PCI host bridge to bus 0000:00
>[ 0.686895][ T1] pci_bus 0000:00: root bus resource [io 0x0000-0x0cf7 window]
>[ 0.687605][ T1] pci_bus 0000:00: root bus resource [io 0x0d00-0xffff window]
>[ 0.688226][ T1] pci_bus 0000:00: root bus resource [mem 0x000a0000-0x000bffff window]
>[ 0.688958][ T1] pci_bus 0000:00: root bus resource [mem 0xc0000000-0xfebfffff window]
>[ 0.689680][ T1] pci_bus 0000:00: root bus resource [mem 0x440000000-0x4bfffffff window]
>[ 0.690446][ T1] pci_bus 0000:00: root bus resource [bus 00-ff]
>[ 0.691131][ T1] pci 0000:00:00.0: [8086:1237] type 00 class 0x060000
>[ 0.694434][ T1] pci 0000:00:01.0: [8086:7000] type 00 class 0x060100
>[ 0.697128][ T1] pci 0000:00:01.1: [8086:7010] type 00 class 0x010180
>[ 0.700363][ T1] pci 0000:00:01.1: reg 0x20: [io 0xc040-0xc04f]
>[ 0.702182][ T1] pci 0000:00:01.1: legacy IDE quirk: reg 0x10: [io 0x01f0-0x01f7]
>[ 0.702306][ T1] pci 0000:00:01.1: legacy IDE quirk: reg 0x14: [io 0x03f6]
>[ 0.703017][ T1] pci 0000:00:01.1: legacy IDE quirk: reg 0x18: [io 0x0170-0x0177]
>[ 0.703618][ T1] pci 0000:00:01.1: legacy IDE quirk: reg 0x1c: [io 0x0376]
>[ 0.705984][ T1] pci 0000:00:01.3: [8086:7113] type 00 class 0x068000
>[ 0.707033][ T1] pci 0000:00:01.3: quirk: [io 0x0600-0x063f] claimed by PIIX4 ACPI
>[ 0.708238][ T1] pci 0000:00:01.3: quirk: [io 0x0700-0x070f] claimed by PIIX4 SMB
>[ 0.710864][ T1] pci 0000:00:02.0: [1234:1111] type 00 class 0x030000
>[ 0.712837][ T1] pci 0000:00:02.0: reg 0x10: [mem 0xfd000000-0xfdffffff pref]
>[ 0.715644][ T1] pci 0000:00:02.0: reg 0x18: [mem 0xfebf0000-0xfebf0fff]
>[ 0.721381][ T1] pci 0000:00:02.0: reg 0x30: [mem 0xfebe0000-0xfebeffff pref]
>[ 0.723990][ T1] pci 0000:00:03.0: [8086:100e] type 00 class 0x020000
>[ 0.725548][ T1] pci 0000:00:03.0: reg 0x10: [mem 0xfebc0000-0xfebdffff]
>[ 0.726570][ T1] pci 0000:00:03.0: reg 0x14: [io 0xc000-0xc03f]
>[ 0.731756][ T1] pci 0000:00:03.0: reg 0x30: [mem 0xfeb80000-0xfebbffff pref]
>[ 0.734403][ T1] pci 0000:00:04.0: [8086:25ab] type 00 class 0x088000
>[ 0.735334][ T1] pci 0000:00:04.0: reg 0x10: [mem 0xfebf1000-0xfebf100f]
>
>
>To reproduce:
>
> # build kernel
> cd linux
> cp config-5.12.0-rc5-00184-g89e28ce60cb6 .config
> make HOSTCC=clang-14 CC=clang-14 ARCH=x86_64 olddefconfig prepare modules_prepare bzImage
>
> git clone https://github.com/intel/lkp-tests.git
> cd lkp-tests
> bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email
>
>
>
>---
>0DAY/LKP+ Test Infrastructure Open Source Technology Center
>https://lists.01.org/hyperkitty/list/lkp@lists.01.org Intel Corporation
>
>Thanks,
>Oliver Sang
>
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