Re: bpf-next boot error: WARNING: workqueue cpumask: online intersect > possible intersect (2)

[Eric Biggers <ebiggers@kernel.org>]

On Mon, Jul 22, 2019 at 11:38:07PM -0700, syzbot wrote:
> Hello,
> 
> syzbot found the following crash on:
> 
> HEAD commit:    66b5f1c4 net-ipv6-ndisc: add support for RFC7710 RA Captiv..
> git tree:       bpf-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=15513e78600000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=9aec8cb13b5f7389
> dashboard link: https://syzkaller.appspot.com/bug?extid=88c042e36cde4bcbd19b
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> 
> Unfortunately, I don't have any reproducer for this crash yet.
> 
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+88c042e36cde4bcbd19b@syzkaller.appspotmail.com
> 
> smpboot: CPU0: Intel(R) Xeon(R) CPU @ 2.30GHz (family: 0x6, model: 0x3f,
> stepping: 0x0)
> Performance Events: unsupported p6 CPU model 63 no PMU driver, software
> events only.
> rcu: Hierarchical SRCU implementation.
> NMI watchdog: Perf NMI watchdog permanently disabled
> smp: Bringing up secondary CPUs ...
> x86: Booting SMP configuration:
> .... node  #0, CPUs:      #1
> MDS CPU bug present and SMT on, data leak possible. See
> https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/mds.html for more
> details.
> smp: Brought up 2 nodes, 2 CPUs
> smpboot: Max logical packages: 1
> smpboot: Total of 2 processors activated (9200.00 BogoMIPS)
> devtmpfs: initialized
> clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns:
> 19112604462750000 ns
> futex hash table entries: 512 (order: 4, 65536 bytes, vmalloc)
> xor: automatically using best checksumming function   avx
> PM: RTC time: 00:21:51, date: 2019-07-23
> NET: Registered protocol family 16
> audit: initializing netlink subsys (disabled)
> cpuidle: using governor menu
> ACPI: bus type PCI registered
> dca service started, version 1.12.1
> PCI: Using configuration type 1 for base access
> WARNING: workqueue cpumask: online intersect > possible intersect
> HugeTLB registered 1.00 GiB page size, pre-allocated 0 pages
> HugeTLB registered 2.00 MiB page size, pre-allocated 0 pages
> cryptd: max_cpu_qlen set to 1000
> raid6: avx2x4   gen() 12057 MB/s
> raid6: avx2x4   xor()  6485 MB/s
> raid6: avx2x2   gen()  5976 MB/s
> raid6: avx2x2   xor()  3848 MB/s
> raid6: avx2x1   gen()   921 MB/s
> raid6: avx2x1   xor()  2173 MB/s
> raid6: sse2x4   gen()  6202 MB/s
> raid6: sse2x4   xor()  3397 MB/s
> raid6: sse2x2   gen()  3875 MB/s
> raid6: sse2x2   xor()  1961 MB/s
> raid6: sse2x1   gen()   789 MB/s
> raid6: sse2x1   xor()   964 MB/s
> raid6: using algorithm avx2x4 gen() 12057 MB/s
> raid6: .... xor() 6485 MB/s, rmw enabled
> raid6: using avx2x2 recovery algorithm
> ACPI: Added _OSI(Module Device)
> ACPI: Added _OSI(Processor Device)
> ACPI: Added _OSI(3.0 _SCP Extensions)
> ACPI: Added _OSI(Processor Aggregator Device)
> ACPI: Added _OSI(Linux-Dell-Video)
> ACPI: Added _OSI(Linux-Lenovo-NV-HDMI-Audio)
> ACPI: Added _OSI(Linux-HPI-Hybrid-Graphics)
> ACPI: 2 ACPI AML tables successfully acquired and loaded
> ACPI: Interpreter enabled
> ACPI: (supports S0 S3 S4 S5)
> ACPI: Using IOAPIC for interrupt routing
> PCI: Using host bridge windows from ACPI; if necessary, use "pci=nocrs" and
> report a bug
> ACPI: Enabled 16 GPEs in block 00 to 0F
> ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-ff])
> acpi PNP0A03:00: _OSC: OS supports [ASPM ClockPM Segments MSI HPX-Type3]
> acpi PNP0A03:00: fail to add MMCONFIG information, can't access extended PCI
> configuration space under this bridge.
> PCI host bridge to bus 0000:00
> pci_bus 0000:00: root bus resource [io  0x0000-0x0cf7 window]
> pci_bus 0000:00: root bus resource [io  0x0d00-0xffff window]
> pci_bus 0000:00: root bus resource [mem 0x000a0000-0x000bffff window]
> pci_bus 0000:00: root bus resource [mem 0xc0000000-0xfebfffff window]
> pci_bus 0000:00: root bus resource [bus 00-ff]
> pci 0000:00:00.0: [8086:1237] type 00 class 0x060000
> pci 0000:00:01.0: [8086:7110] type 00 class 0x060100
> pci 0000:00:01.3: [8086:7113] type 00 class 0x068000
> pci 0000:00:01.3: quirk: [io  0xb000-0xb03f] claimed by PIIX4 ACPI
> pci 0000:00:03.0: [1af4:1004] type 00 class 0x000000
> pci 0000:00:03.0: reg 0x10: [io  0xc000-0xc03f]
> pci 0000:00:03.0: reg 0x14: [mem 0xfebfe000-0xfebfe07f]
> pci 0000:00:04.0: [1af4:1000] type 00 class 0x020000
> pci 0000:00:04.0: reg 0x10: [io  0xc040-0xc07f]
> pci 0000:00:04.0: reg 0x14: [mem 0xfebff000-0xfebff07f]
> ACPI: PCI Interrupt Link [LNKA] (IRQs 5 *10 11)
> ACPI: PCI Interrupt Link [LNKB] (IRQs 5 *10 11)
> ACPI: PCI Interrupt Link [LNKC] (IRQs 5 10 *11)
> ACPI: PCI Interrupt Link [LNKD] (IRQs 5 10 *11)
> ACPI: PCI Interrupt Link [LNKS] (IRQs *9)
> vgaarb: loaded
> SCSI subsystem initialized
> ACPI: bus type USB registered
> usbcore: registered new interface driver usbfs
> usbcore: registered new interface driver hub
> usbcore: registered new device driver usb
> mc: Linux media interface: v0.10
> videodev: Linux video capture interface: v2.00
> pps_core: LinuxPPS API ver. 1 registered
> pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti
> <giometti@linux.it>
> PTP clock support registered
> EDAC MC: Ver: 3.0.0
> Advanced Linux Sound Architecture Driver Initialized.
> PCI: Using ACPI for IRQ routing
> Bluetooth: Core ver 2.22
> NET: Registered protocol family 31
> Bluetooth: HCI device and connection manager initialized
> Bluetooth: HCI socket layer initialized
> Bluetooth: L2CAP socket layer initialized
> Bluetooth: SCO socket layer initialized
> NET: Registered protocol family 8
> NET: Registered protocol family 20
> NetLabel: Initializing
> NetLabel:  domain hash size = 128
> NetLabel:  protocols = UNLABELED CIPSOv4 CALIPSO
> NetLabel:  unlabeled traffic allowed by default
> nfc: nfc_init: NFC Core ver 0.1
> NET: Registered protocol family 39
> clocksource: Switched to clocksource kvm-clock
> VFS: Disk quotas dquot_6.6.0
> VFS: Dquot-cache hash table entries: 512 (order 0, 4096 bytes)
> FS-Cache: Loaded
> *** VALIDATE hugetlbfs ***
> CacheFiles: Loaded
> TOMOYO: 2.6.0
> Mandatory Access Control activated.
> AppArmor: AppArmor Filesystem Enabled
> pnp: PnP ACPI init
> pnp: PnP ACPI: found 7 devices
> thermal_sys: Registered thermal governor 'step_wise'
> thermal_sys: Registered thermal governor 'user_space'
> clocksource: acpi_pm: mask: 0xffffff max_cycles: 0xffffff, max_idle_ns:
> 2085701024 ns
> pci_bus 0000:00: resource 4 [io  0x0000-0x0cf7 window]
> pci_bus 0000:00: resource 5 [io  0x0d00-0xffff window]
> pci_bus 0000:00: resource 6 [mem 0x000a0000-0x000bffff window]
> pci_bus 0000:00: resource 7 [mem 0xc0000000-0xfebfffff window]
> NET: Registered protocol family 2
> tcp_listen_portaddr_hash hash table entries: 4096 (order: 6, 294912 bytes,
> vmalloc)
> TCP established hash table entries: 65536 (order: 7, 524288 bytes, vmalloc)
> TCP bind hash table entries: 65536 (order: 10, 4194304 bytes, vmalloc)
> TCP: Hash tables configured (established 65536 bind 65536)
> UDP hash table entries: 4096 (order: 7, 655360 bytes, vmalloc)
> UDP-Lite hash table entries: 4096 (order: 7, 655360 bytes, vmalloc)
> NET: Registered protocol family 1
> RPC: Registered named UNIX socket transport module.
> RPC: Registered udp transport module.
> RPC: Registered tcp transport module.
> RPC: Registered tcp NFSv4.1 backchannel transport module.
> NET: Registered protocol family 44
> pci 0000:00:00.0: Limiting direct PCI/PCI transfers
> PCI: CLS 0 bytes, default 64
> PCI-DMA: Using software bounce buffering for IO (SWIOTLB)
> software IO TLB: mapped [mem 0xaa800000-0xae800000] (64MB)
> RAPL PMU: API unit is 2^-32 Joules, 0 fixed counters, 10737418240 ms ovfl
> timer
> kvm: already loaded the other module
> clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x212735223b2,
> max_idle_ns: 440795277976 ns
> clocksource: Switched to clocksource tsc
> mce: Machine check injector initialized
> check: Scanning for low memory corruption every 60 seconds
> Initialise system trusted keyrings
> workingset: timestamp_bits=40 max_order=21 bucket_order=0
> zbud: loaded
> DLM installed
> squashfs: version 4.0 (2009/01/31) Phillip Lougher
> FS-Cache: Netfs 'nfs' registered for caching
> NFS: Registering the id_resolver key type
> Key type id_resolver registered
> Key type id_legacy registered
> nfs4filelayout_init: NFSv4 File Layout Driver Registering...
> Installing knfsd (copyright (C) 1996 okir@monad.swb.de).
> ntfs: driver 2.1.32 [Flags: R/W].
> fuse: init (API version 7.31)
> JFS: nTxBlock = 8192, nTxLock = 65536
> SGI XFS with ACLs, security attributes, realtime, no debug enabled
> 9p: Installing v9fs 9p2000 file system support
> FS-Cache: Netfs '9p' registered for caching
> gfs2: GFS2 installed
> FS-Cache: Netfs 'ceph' registered for caching
> ceph: loaded (mds proto 32)
> NET: Registered protocol family 38
> async_tx: api initialized (async)
> Key type asymmetric registered
> Asymmetric key parser 'x509' registered
> Asymmetric key parser 'pkcs8' registered
> Key type pkcs7_test registered
> Asymmetric key parser 'tpm_parser' registered
> Block layer SCSI generic (bsg) driver version 0.4 loaded (major 246)
> io scheduler mq-deadline registered
> io scheduler kyber registered
> io scheduler bfq registered
> input: Power Button as /devices/LNXSYSTM:00/LNXPWRBN:00/input/input0
> ACPI: Power Button [PWRF]
> input: Sleep Button as /devices/LNXSYSTM:00/LNXSLPBN:00/input/input1
> ACPI: Sleep Button [SLPF]
> ioatdma: Intel(R) QuickData Technology Driver 5.00
> PCI Interrupt Link [LNKC] enabled at IRQ 11
> virtio-pci 0000:00:03.0: virtio_pci: leaving for legacy driver
> PCI Interrupt Link [LNKD] enabled at IRQ 10
> virtio-pci 0000:00:04.0: virtio_pci: leaving for legacy driver
> HDLC line discipline maxframe=4096
> N_HDLC line discipline registered.
> Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
> 00:03: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
> 00:04: ttyS1 at I/O 0x2f8 (irq = 3, base_baud = 115200) is a 16550A
> 00:05: ttyS2 at I/O 0x3e8 (irq = 6, base_baud = 115200) is a 16550A
> 00:06: ttyS3 at I/O 0x2e8 (irq = 7, base_baud = 115200) is a 16550A
> Non-volatile memory driver v1.3
> Linux agpgart interface v0.103
> [drm] Initialized vgem 1.0.0 20120112 for vgem on minor 0
> [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
> [drm] Driver supports precise vblank timestamp query.
> [drm] Initialized vkms 1.0.0 20180514 for vkms on minor 1
> usbcore: registered new interface driver udl
> brd: module loaded
> loop: module loaded
> zram: Added device: zram0
> null: module loaded
> nfcsim 0.2 initialized
> Loading iSCSI transport class v2.0-870.
> scsi host0: Virtio SCSI HBA
> st: Version 20160209, fixed bufsize 32768, s/g segs 256
> kobject: 'sd' (00000000062140f2): kobject_uevent_env
> kobject: 'sd' (00000000062140f2): fill_kobj_path: path =
> '/bus/scsi/drivers/sd'
> kobject: 'sr' (00000000ef64c50b): kobject_add_internal: parent: 'drivers',
> set: 'drivers'
> kobject: 'sr' (00000000ef64c50b): kobject_uevent_env
> kobject: 'sr' (00000000ef64c50b): fill_kobj_path: path =
> '/bus/scsi/drivers/sr'
> kobject: 'scsi_generic' (00000000007b57bc): kobject_add_internal: parent:
> 'class', set: 'class'
> kobject: 'scsi_generic' (00000000007b57bc): kobject_uevent_env
> kobject: 'scsi_generic' (00000000007b57bc): fill_kobj_path: path =
> '/class/scsi_generic'
> kobject: 'nvme-wq' (00000000b79e19cd): kobject_add_internal: parent:
> 'workqueue', set: 'devices'
> kobject: 'nvme-wq' (00000000b79e19cd): kobject_uevent_env
> kobject: 'nvme-wq' (00000000b79e19cd): kobject_uevent_env: uevent_suppress
> caused the event to drop!
> kobject: 'nvme-wq' (00000000b79e19cd): kobject_uevent_env
> kobject: 'nvme-wq' (00000000b79e19cd): fill_kobj_path: path =
> '/devices/virtual/workqueue/nvme-wq'
> kobject: 'nvme-reset-wq' (0000000070597663): kobject_add_internal: parent:
> 'workqueue', set: 'devices'
> kobject: 'nvme-reset-wq' (0000000070597663): kobject_uevent_env
> kobject: 'nvme-reset-wq' (0000000070597663): kobject_uevent_env:
> uevent_suppress caused the event to drop!
> kobject: 'nvme-reset-wq' (0000000070597663): kobject_uevent_env
> kobject: 'nvme-reset-wq' (0000000070597663): fill_kobj_path: path =
> '/devices/virtual/workqueue/nvme-reset-wq'
> kobject: 'nvme-delete-wq' (00000000c9ed28dd): kobject_add_internal: parent:
> 'workqueue', set: 'devices'
> kobject: 'nvme-delete-wq' (00000000c9ed28dd): kobject_uevent_env
> kobject: 'nvme-delete-wq' (00000000c9ed28dd): kobject_uevent_env:
> uevent_suppress caused the event to drop!
> kobject: 'nvme-delete-wq' (00000000c9ed28dd): kobject_uevent_env
> kobject: 'nvme-delete-wq' (00000000c9ed28dd): fill_kobj_path: path =
> '/devices/virtual/workqueue/nvme-delete-wq'
> 
> 
> ---
> This bug is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@googlegroups.com.
> 
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#syz dup: linux-next boot error: WARNING: workqueue cpumask: online intersect > possible intersect