Message-ID: <CACT4Y+Y6X4p4OPpUbD9nzurjQCLT2tv=nSFxee5imSr00s8E6A@mail.gmail.com>
Date:   Thu, 5 Jul 2018 18:19:47 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+1fe433a61ed065e1848a@...kaller.appspotmail.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: KASAN: stack-out-of-bounds Read in __hrtimer_run_queues

On Wed, Jul 4, 2018 at 5:14 PM, syzbot
<syzbot+1fe433a61ed065e1848a@...kaller.appspotmail.com> wrote:
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit:    2bdea157b999 Merge branch 'sctp-fully-support-for-dscp-and..
> git tree:       bpf-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=155b32d0400000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=f62553dc846b0692
> dashboard link: https://syzkaller.appspot.com/bug?extid=1fe433a61ed065e1848a
> compiler:       gcc (GCC) 8.0.1 20180413 (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+1fe433a61ed065e1848a@...kaller.appspotmail.com

#syz dup: KASAN: stack-out-of-bounds Read in timerqueue_add

> ==================================================================
> BUG: KASAN: stack-out-of-bounds in __hrtimer_run_queues+0xf78/0x10c0
> kernel/time/hrtimer.c:1457
> Read of size 8 at addr ffff8801a9757d00 by task syz-executor7/16190
>
> CPU: 0 PID: 16190 Comm: syz-executor7 Not tainted 4.18.0-rc3+ #45
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Call Trace:
>  <IRQ>
>  __dump_stack lib/dump_stack.c:77 [inline]
>  dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113
>  print_address_description+0x6c/0x20b mm/kasan/report.c:256
>  kasan_report_error mm/kasan/report.c:354 [inline]
>  kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
>  __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
>  __hrtimer_run_queues+0xf78/0x10c0 kernel/time/hrtimer.c:1457
> Linux version 4.18.0-rc3+ (syzkaller@ci) (gcc version 8.0.1 20180413
> (experimental) (GCC)) #45 SMP Wed Jul 4 07:02:20 UTC 2018
> Command line: BOOT_IMAGE=/vmlinuz root=/dev/sda1 console=ttyS0
> earlyprintk=serial vsyscall=native rodata=n ftrace_dump_on_oops=orig_cpu
> oops=panic panic_on_warn=1 nmi_watchdog=panic panic=86400 kvm-intel.nested=1
> nf-conntrack-ftp.ports=20000 nf-conntrack-tftp.ports=20000
> nf-conntrack-sip.ports=20000 nf-conntrack-irc.ports=20000
> nf-conntrack-sane.ports=20000 nopcid
> x86/fpu: Supporting XSAVE feature 0x001: 'x87 floating point registers'
> x86/fpu: Supporting XSAVE feature 0x002: 'SSE registers'
> x86/fpu: Supporting XSAVE feature 0x004: 'AVX registers'
> x86/fpu: xstate_offset[2]:  576, xstate_sizes[2]:  256
> x86/fpu: Enabled xstate features 0x7, context size is 832 bytes, using
> 'standard' format.
> BIOS-provided physical RAM map:
> BIOS-e820: [mem 0x0000000000000000-0x000000000009fbff] usable
> BIOS-e820: [mem 0x000000000009fc00-0x000000000009ffff] reserved
> BIOS-e820: [mem 0x00000000000f0000-0x00000000000fffff] reserved
> BIOS-e820: [mem 0x0000000000100000-0x00000000bfff2fff] usable
> BIOS-e820: [mem 0x00000000bfff3000-0x00000000bfffffff] reserved
> BIOS-e820: [mem 0x00000000fffbc000-0x00000000ffffffff] reserved
> BIOS-e820: [mem 0x0000000100000000-0x000000021fffffff] usable
> bootconsole [earlyser0] enabled
> Malformed early option 'vsyscall'
> nopcid: PCID feature disabled
> NX (Execute Disable) protection: active
> SMBIOS 2.4 present.
> DMI: Google Google Compute Engine/Google Compute Engine, BIOS Google
> 01/01/2011
> Hypervisor detected: KVM
> last_pfn = 0x220000 max_arch_pfn = 0x400000000
> x86/PAT: Configuration [0-7]: WB  WC  UC- UC  WB  WP  UC- WT
> last_pfn = 0xbfff3 max_arch_pfn = 0x400000000
> found SMP MP-table at [mem 0x000f2310-0x000f231f] mapped at
> [(____ptrval____)]
> Scanning 1 areas for low memory corruption
> Using GB pages for direct mapping
> ACPI: Early table checksum verification disabled
> ACPI: RSDP 0x00000000000F22D0 000014 (v00 Google)
> ACPI: RSDT 0x00000000BFFF3430 000038 (v01 Google GOOGRSDT 00000001 GOOG
> 00000001)
> ACPI: FACP 0x00000000BFFFCF60 0000F4 (v02 Google GOOGFACP 00000001 GOOG
> 00000001)
> ACPI: DSDT 0x00000000BFFF3470 0017B2 (v01 Google GOOGDSDT 00000001 GOOG
> 00000001)
> ACPI: FACS 0x00000000BFFFCF00 000040
> ACPI: FACS 0x00000000BFFFCF00 000040
> ACPI: SSDT 0x00000000BFFF65F0 00690D (v01 Google GOOGSSDT 00000001 GOOG
> 00000001)
> ACPI: APIC 0x00000000BFFF5D10 000076 (v01 Google GOOGAPIC 00000001 GOOG
> 00000001)
> ACPI: WAET 0x00000000BFFF5CE0 000028 (v01 Google GOOGWAET 00000001 GOOG
> 00000001)
> ACPI: SRAT 0x00000000BFFF4C30 0000C8 (v01 Google GOOGSRAT 00000001 GOOG
> 00000001)
> SRAT: PXM 0 -> APIC 0x00 -> Node 0
> SRAT: PXM 0 -> APIC 0x01 -> Node 0
> ACPI: SRAT: Node 0 PXM 0 [mem 0x00000000-0x0009ffff]
> ACPI: SRAT: Node 0 PXM 0 [mem 0x00100000-0xbfffffff]
> ACPI: SRAT: Node 0 PXM 0 [mem 0x100000000-0x21fffffff]
> NUMA: Node 0 [mem 0x00000000-0x0009ffff] + [mem 0x00100000-0xbfffffff] ->
> [mem 0x00000000-0xbfffffff]
> NUMA: Node 0 [mem 0x00000000-0xbfffffff] + [mem 0x100000000-0x21fffffff] ->
> [mem 0x00000000-0x21fffffff]
> NODE_DATA(0) allocated [mem 0x21fffa000-0x21fffdfff]
> kvm-clock: cpu 0, msr 2:1fff8001, primary cpu clock
> kvm-clock: Using msrs 4b564d01 and 4b564d00
> kvm-clock: using sched offset of 4633492886 cycles
> clocksource: kvm-clock: mask: 0xffffffffffffffff max_cycles: 0x1cd42e4dffb,
> max_idle_ns: 881590591483 ns
> Zone ranges:
>   DMA      [mem 0x0000000000001000-0x0000000000ffffff]
>   DMA32    [mem 0x0000000001000000-0x00000000ffffffff]
>   Normal   [mem 0x0000000100000000-0x000000021fffffff]
> Movable zone start for each node
> Early memory node ranges
>   node   0: [mem 0x0000000000001000-0x000000000009efff]
>   node   0: [mem 0x0000000000100000-0x00000000bfff2fff]
>   node   0: [mem 0x0000000100000000-0x000000021fffffff]
> Initmem setup node 0 [mem 0x0000000000001000-0x000000021fffffff]
> Reserved but unavailable: 111 pages
> kasan: KernelAddressSanitizer initialized
> ACPI: PM-Timer IO Port: 0xb008
> ACPI: LAPIC_NMI (acpi_id[0xff] dfl dfl lint[0x1])
> IOAPIC[0]: apic_id 0, version 17, address 0xfec00000, GSI 0-23
> ACPI: INT_SRC_OVR (bus 0 bus_irq 5 global_irq 5 high level)
> ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level)
> ACPI: INT_SRC_OVR (bus 0 bus_irq 10 global_irq 10 high level)
> ACPI: INT_SRC_OVR (bus 0 bus_irq 11 global_irq 11 high level)
> Using ACPI (MADT) for SMP configuration information
> smpboot: Allowing 2 CPUs, 0 hotplug CPUs
> PM: Registered nosave memory: [mem 0x00000000-0x00000fff]
> PM: Registered nosave memory: [mem 0x0009f000-0x0009ffff]
> PM: Registered nosave memory: [mem 0x000a0000-0x000effff]
> PM: Registered nosave memory: [mem 0x000f0000-0x000fffff]
> PM: Registered nosave memory: [mem 0xbfff3000-0xbfffffff]
> PM: Registered nosave memory: [mem 0xc0000000-0xfffbbfff]
> PM: Registered nosave memory: [mem 0xfffbc000-0xffffffff]
> [mem 0xc0000000-0xfffbbfff] available for PCI devices
> Booting paravirtualized kernel on KVM
> clocksource: refined-jiffies: mask: 0xffffffff max_cycles: 0xffffffff,
> max_idle_ns: 1910969940391419 ns
> random: get_random_bytes called from boot_init_stack_canary
> arch/x86/include/asm/stackprotector.h:75 [inline] with crng_init=0
> random: get_random_bytes called from start_kernel+0x112/0x949
> init/main.c:559 with crng_init=0
> setup_percpu: NR_CPUS:64 nr_cpumask_bits:64 nr_cpu_ids:2 nr_node_ids:1
> percpu: Embedded 56 pages/cpu @(____ptrval____) s188616 r8192 d32568
> u1048576
> Built 1 zonelists, mobility grouping on.  Total pages: 1935228
> Policy zone: Normal
> Kernel command line: BOOT_IMAGE=/vmlinuz root=/dev/sda1 console=ttyS0
> earlyprintk=serial vsyscall=native rodata=n ftrace_dump_on_oops=orig_cpu
> oops=panic panic_on_warn=1 nmi_watchdog=panic panic=86400 kvm-intel.nested=1
> nf-conntrack-ftp.ports=20000 nf-conntrack-tftp.ports=20000
> nf-conntrack-sip.ports=20000 nf-conntrack-irc.ports=20000
> nf-conntrack-sane.ports=20000 nopcid
> Memory: 6499788K/7863876K available (110620K kernel code, 12321K rwdata,
> 16056K rodata, 3968K init, 23144K bss, 1364088K reserved, 0K cma-reserved)
> Running RCU self tests
> Hierarchical RCU implementation.
>         RCU lockdep checking is enabled.
>         RCU restricting CPUs from NR_CPUS=64 to nr_cpu_ids=2.
>         RCU callback double-/use-after-free debug enabled.
> RCU: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=2
> NR_IRQS: 4352, nr_irqs: 440, preallocated irqs: 16
> Console: colour VGA+ 80x25
> console [ttyS0] enabled
> console [ttyS0] enabled
> bootconsole [earlyser0] disabled
> bootconsole [earlyser0] disabled
> Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar
> ... MAX_LOCKDEP_SUBCLASSES:  8
> ... MAX_LOCK_DEPTH:          48
> ... MAX_LOCKDEP_KEYS:        8191
> ... CLASSHASH_SIZE:          4096
> ... MAX_LOCKDEP_ENTRIES:     32768
> ... MAX_LOCKDEP_CHAINS:      65536
> ... CHAINHASH_SIZE:          32768
>  memory used by lock dependency info: 7391 kB
>  per task-struct memory footprint: 1920 bytes
> ACPI: Core revision 20180531
> APIC: Switch to symmetric I/O mode setup
> x2apic enabled
> Switched APIC routing to physical x2apic.
> ..TIMER: vector=0x30 apic1=0 pin1=0 apic2=-1 pin2=-1
> tsc: Detected 2300.000 MHz processor
> clocksource: tsc-early: mask: 0xffffffffffffffff max_cycles: 0x212735223b2,
> max_idle_ns: 440795277976 ns
> Calibrating delay loop (skipped) preset value.. 4600.00 BogoMIPS
> (lpj=2300000)
> pid_max: default: 32768 minimum: 301
> Security Framework initialized
> Yama: becoming mindful.
> SELinux:  Initializing.
> AppArmor: AppArmor disabled by boot time parameter
> Dentry cache hash table entries: 1048576 (order: 11, 8388608 bytes)
> Inode-cache hash table entries: 524288 (order: 10, 4194304 bytes)
> Mount-cache hash table entries: 16384 (order: 5, 131072 bytes)
> Mountpoint-cache hash table entries: 16384 (order: 5, 131072 bytes)
> CPU: Physical Processor ID: 0
> mce: CPU supports 32 MCE banks
> Last level iTLB entries: 4KB 1024, 2MB 1024, 4MB 1024
> Last level dTLB entries: 4KB 1024, 2MB 1024, 4MB 1024, 1GB 4
> Spectre V2 : Mitigation: Full generic retpoline
> Speculative Store Bypass: Vulnerable
> Freeing SMP alternatives memory: 64K
> 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.
> Hierarchical SRCU implementation.
> NMI watchdog: Perf event create on CPU 0 failed with -2
> NMI watchdog: Perf NMI watchdog permanently disabled
> smp: Bringing up secondary CPUs ...
> x86: Booting SMP configuration:
> .... node  #0, CPUs:      #1
> kvm-clock: cpu 1, msr 2:1fff8041, secondary cpu clock
> smp: Brought up 1 node, 2 CPUs
> smpboot: Max logical packages: 1
> smpboot: Total of 2 processors activated (9200.00 BogoMIPS)
> devtmpfs: initialized
> kworker/u4:0 (24) used greatest stack depth: 24072 bytes left
> clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns:
> 1911260446275000 ns
> futex hash table entries: 512 (order: 4, 65536 bytes)
> xor: automatically using best checksumming function   avx
> RTC time: 12:14:59, date: 07/04/18
> NET: Registered protocol family 16
> audit: initializing netlink subsys (disabled)
> audit: type=2000 audit(1530706499.296:1): state=initialized audit_enabled=0
> res=1
> cpuidle: using governor menu
> kworker/u4:1 (38) used greatest stack depth: 23840 bytes left
> ACPI: bus type PCI registered
> PCI: Using configuration type 1 for base access
> kworker/u4:3 (214) used greatest stack depth: 22816 bytes left
> kworker/u4:3 (319) used greatest stack depth: 21704 bytes left
> HugeTLB registered 2.00 MiB page size, pre-allocated 0 pages
> cryptd: max_cpu_qlen set to 1000
> raid6: sse2x1   gen()  1859 MB/s
> raid6: sse2x1   xor()  1013 MB/s
> raid6: sse2x2   gen()  3746 MB/s
> raid6: sse2x2   xor()  1914 MB/s
> raid6: sse2x4   gen()  5972 MB/s
> raid6: sse2x4   xor()  3417 MB/s
> raid6: avx2x1   gen()  2042 MB/s
> raid6: avx2x1   xor()  1896 MB/s
> raid6: avx2x2   gen()  5832 MB/s
> raid6: avx2x2   xor()  3832 MB/s
> raid6: avx2x4   gen() 11617 MB/s
> raid6: avx2x4   xor()  6251 MB/s
> raid6: using algorithm avx2x4 gen() 11617 MB/s
> raid6: .... xor() 6251 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: 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]
> acpi PNP0A03:00: _OSC failed (AE_NOT_FOUND); disabling ASPM
> 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 0000:00:01.3: quirk: [io  0xb000-0xb03f] claimed by PIIX4 ACPI
> 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
> pps_core: LinuxPPS API ver. 1 registered
> pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti
> <giometti@...ux.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
> CacheFiles: Loaded
> pnp: PnP ACPI init
> pnp: PnP ACPI: found 7 devices
> clocksource: acpi_pm: mask: 0xffffff max_cycles: 0xffffff, max_idle_ns:
> 2085701024 ns
> NET: Registered protocol family 2
> tcp_listen_portaddr_hash hash table entries: 4096 (order: 6, 294912 bytes)
> TCP established hash table entries: 65536 (order: 7, 524288 bytes)
> TCP bind hash table entries: 65536 (order: 10, 4194304 bytes)
> TCP: Hash tables configured (established 65536 bind 65536)
> UDP hash table entries: 4096 (order: 7, 655360 bytes)
> UDP-Lite hash table entries: 4096 (order: 7, 655360 bytes)
> 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-DMA: Using software bounce buffering for IO (SWIOTLB)
> software IO TLB [mem 0xbbff3000-0xbfff3000] (64MB) mapped at
> [(____ptrval____)-(____ptrval____)]
> RAPL PMU: API unit is 2^-32 Joules, 3 fixed counters, 10737418240 ms ovfl
> timer
> RAPL PMU: hw unit of domain pp0-core 2^-0 Joules
> RAPL PMU: hw unit of domain package 2^-0 Joules
> RAPL PMU: hw unit of domain dram 2^-16 Joules
> VPID CAP should not exist if not support 1-setting enable VPID VM-execution
> control
> kvm: already loaded the other module
> Machine check injector initialized
> Scanning for low memory corruption every 60 seconds
> Initialise system trusted keyrings
> workingset: timestamp_bits=40 max_order=21 bucket_order=0
> DLM installed
> 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@...ad.swb.de).
> ntfs: driver 2.1.32 [Flags: R/W].
> fuse init (API version 7.27)
> 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
> Key type pkcs7_test registered
> Block layer SCSI generic (bsg) driver version 0.4 loaded (major 250)
> io scheduler noop registered
> io scheduler deadline registered
> io scheduler cfq registered (default)
> 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]
> 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
> 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] radeon kernel modesetting enabled.
> [drm] amdgpu kernel modesetting enabled.
> brd: module loaded
> loop: module loaded
>
>
> ---
> 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@...glegroups.com.
>
> syzbot will keep track of this bug report. See:
> https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with
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