[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.059596] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.566020] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 23.857629] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 24.983401] random: nonblocking pool is initialized Warning: Permanently added '10.128.10.28' (ECDSA) to the list of known hosts. 2018/05/19 00:15:35 parsed 1 programs 2018/05/19 00:15:35 executed programs: 0 [ 58.108574] IPVS: Creating netns size=2552 id=1 [ 58.281223] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 58.295985] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 58.374848] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 58.388699] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 58.470228] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 58.484548] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 58.501483] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 58.519336] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 59.218057] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 59.255984] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 61.220256] ================================================================== [ 61.227662] BUG: KASAN: use-after-free in pppol2tp_session_destruct+0xf2/0x110 [ 61.234994] Read of size 4 at addr ffff8800b9365680 by task syz-executor0/4421 [ 61.242320] [ 61.243923] CPU: 0 PID: 4421 Comm: syz-executor0 Not tainted 4.4.132-g4f75c34 #41 [ 61.251511] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.260835] 0000000000000000 3a21b856053259dc ffff8800ba50f810 ffffffff81e0df8d [ 61.268817] ffffea0002e4d900 ffff8800b9365680 0000000000000000 ffff8800b9365680 [ 61.276806] ffffffff82f18e30 ffff8800ba50f848 ffffffff8151526c ffff8800b9365680 [ 61.284783] Call Trace: [ 61.287353] [] dump_stack+0xc1/0x124 [ 61.292690] [] ? sock_release+0x1c0/0x1c0 [ 61.298460] [] print_address_description+0x6c/0x216 [ 61.305096] [] ? sock_release+0x1c0/0x1c0 [ 61.310864] [] kasan_report.cold.7+0x175/0x2f7 [ 61.317073] [] ? pppol2tp_session_destruct+0xf2/0x110 [ 61.323890] [] __asan_report_load4_noabort+0x14/0x20 [ 61.330616] [] pppol2tp_session_destruct+0xf2/0x110 [ 61.337254] [] ? pppol2tp_seq_start+0x4e0/0x4e0 [ 61.343553] [] sk_destruct+0x4c/0x4c0 [ 61.348986] [] __sk_free+0x15e/0x220 [ 61.354343] [] sk_free+0x30/0x40 [ 61.354352] [] pppol2tp_release+0x26a/0x310 [ 61.354360] [] sock_release+0x96/0x1c0 SeaBIOS (version 1.8.2-20171130_102032-google) Total RAM Size = 0x00000001e0000000 = 7680 MiB CPUs found: 2 Max CPUs supported: 256 found virtio-scsi at 0:3 virtio-scsi vendor='Google' product='PersistentDisk' rev='1' type=0 removable=0 virtio-scsi blksize=512 sectors=4194304 = 2048 MiB drive 0x000f2350: PCHS=0/0/0 translation=lba LCHS=520/128/63 s=4194304 Booting from Hard Disk 0... early console in decompress_kernel input_data: 0x0000000003b5226e input_len: 0x00000000014cba9a output: 0x0000000001000000 output_len: 0x0000000004008a40 run_size: 0x0000000005752000 Decompressing Linux... Parsing ELF... done. Booting the kernel. [ 0.000000] Initializing cgroup subsys cpuset [ 0.000000] Initializing cgroup subsys cpu [ 0.000000] Initializing cgroup subsys cpuacct [ 0.000000] Initializing cgroup subsys schedtune [ 0.000000] Linux version 4.4.132-g4f75c34 (syzkaller@ci) (gcc version 8.0.1 20180413 (experimental) (GCC) ) #41 SMP PREEMPT Fri May 18 21:41:12 UTC 2018 [ 0.000000] 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 workqueue.watchdog_thresh=120 nopti [ 0.000000] KERNEL supported cpus: [ 0.000000] Intel GenuineIntel [ 0.000000] AMD AuthenticAMD [ 0.000000] Centaur CentaurHauls [ 0.000000] x86/fpu: xstate_offset[2]: 576, xstate_sizes[2]: 256 [ 0.000000] x86/fpu: Supporting XSAVE feature 0x01: 'x87 floating point registers' [ 0.000000] x86/fpu: Supporting XSAVE feature 0x02: 'SSE registers' [ 0.000000] x86/fpu: Supporting XSAVE feature 0x04: 'AVX registers' [ 0.000000] x86/fpu: Enabled xstate features 0x7, context size is 832 bytes, using 'standard' format. [ 0.000000] x86/fpu: Using 'eager' FPU context switches. [ 0.000000] e820: BIOS-provided physical RAM map: [ 0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009fbff] usable [ 0.000000] BIOS-e820: [mem 0x000000000009fc00-0x000000000009ffff] reserved [ 0.000000] BIOS-e820: [mem 0x00000000000f0000-0x00000000000fffff] reserved [ 0.000000] BIOS-e820: [mem 0x0000000000100000-0x00000000bfff2fff] usable [ 0.000000] BIOS-e820: [mem 0x00000000bfff3000-0x00000000bfffffff] reserved [ 0.000000] BIOS-e820: [mem 0x00000000fffbc000-0x00000000ffffffff] reserved [ 0.000000] BIOS-e820: [mem 0x0000000100000000-0x000000021fffffff] usable [ 0.000000] bootconsole [earlyser0] enabled [ 0.000000] NX (Execute Disable) protection: active [ 0.000000] SMBIOS 2.4 present. [ 0.000000] Hypervisor detected: KVM [ 0.000000] Kernel/User page tables isolation: disabled [ 0.000000] e820: last_pfn = 0x220000 max_arch_pfn = 0x400000000 [ 0.000000] x86/PAT: Configuration [0-7]: WB WC UC- UC WB WC UC- WT [ 0.000000] e820: last_pfn = 0xbfff3 max_arch_pfn = 0x400000000 [ 0.000000] found SMP MP-table at [mem 0x000f23d0-0x000f23df] mapped at [ffff8800000f23d0] [ 0.000000] Scanning 1 areas for low memory corruption [ 0.000000] Using GB pages for direct mapping [ 0.000000] ACPI: Early table checksum verification disabled [ 0.000000] ACPI: RSDP 0x00000000000F2390 000014 (v00 Google) [ 0.000000] ACPI: RSDT 0x00000000BFFF3430 000038 (v01 Google GOOGRSDT 00000001 GOOG 00000001) [ 0.000000] ACPI: FACP 0x00000000BFFFCF60 0000F4 (v02 Google GOOGFACP 00000001 GOOG 00000001) [ 0.000000] ACPI: DSDT 0x00000000BFFF3470 0017B2 (v01 Google GOOGDSDT 00000001 GOOG 00000001) [ 0.000000] ACPI: FACS 0x00000000BFFFCF00 000040 [ 0.000000] ACPI: FACS 0x00000000BFFFCF00 000040 [ 0.000000] ACPI: SSDT 0x00000000BFFF65F0 00690D (v01 Google GOOGSSDT 00000001 GOOG 00000001) [ 0.000000] ACPI: APIC 0x00000000BFFF5D10 000076 (v01 Google GOOGAPIC 00000001 GOOG 00000001) [ 0.000000] ACPI: WAET 0x00000000BFFF5CE0 000028 (v01 Google GOOGWAET 00000001 GOOG 00000001) [ 0.000000] ACPI: SRAT 0x00000000BFFF4C30 0000C8 (v01 Google GOOGSRAT 00000001 GOOG 00000001) [ 0.000000] kvm-clock: Using msrs 4b564d01 and 4b564d00 [ 0.000000] kvm-clock: cpu 0, msr 2:1fffd001, primary cpu clock [ 0.000000] kvm-clock: using sched offset of 2322962255 cycles [ 0.000000] clocksource: kvm-clock: mask: 0xffffffffffffffff max_cycles: 0x1cd42e4dffb, max_idle_ns: 881590591483 ns [ 0.000000] Zone ranges: [ 0.000000] DMA [mem 0x0000000000001000-0x0000000000ffffff] [ 0.000000] DMA32 [mem 0x0000000001000000-0x00000000ffffffff] [ 0.000000] Normal [mem 0x0000000100000000-0x000000021fffffff] [ 0.000000] Movable zone start for each node [ 0.000000] Early memory node ranges [ 0.000000] node 0: [mem 0x0000000000001000-0x000000000009efff] [ 0.000000] node 0: [mem 0x0000000000100000-0x00000000bfff2fff] [ 0.000000] node 0: [mem 0x0000000100000000-0x000000021fffffff] [ 0.000000] Initmem setup node 0 [mem 0x0000000000001000-0x000000021fffffff] [ 0.000000] kasan: KernelAddressSanitizer initialized [ 0.000000] ACPI: PM-Timer IO Port: 0xb008 [ 0.000000] ACPI: LAPIC_NMI (acpi_id[0xff] dfl dfl lint[0x1]) [ 0.000000] IOAPIC[0]: apic_id 0, version 17, address 0xfec00000, GSI 0-23 [ 0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 5 global_irq 5 high level) [ 0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level) [ 0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 10 global_irq 10 high level) [ 0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 11 global_irq 11 high level) [ 0.000000] Using ACPI (MADT) for SMP configuration information [ 0.000000] smpboot: Allowing 2 CPUs, 0 hotplug CPUs [ 0.000000] PM: Registered nosave memory: [mem 0x00000000-0x00000fff] [ 0.000000] PM: Registered nosave memory: [mem 0x0009f000-0x0009ffff] [ 0.000000] PM: Registered nosave memory: [mem 0x000a0000-0x000effff] [ 0.000000] PM: Registered nosave memory: [mem 0x000f0000-0x000fffff] [ 0.000000] PM: Registered nosave memory: [mem 0xbfff3000-0xbfffffff] [ 0.000000] PM: Registered nosave memory: [mem 0xc0000000-0xfffbbfff] [ 0.000000] PM: Registered nosave memory: [mem 0xfffbc000-0xffffffff] [ 0.000000] e820: [mem 0xc0000000-0xfffbbfff] available for PCI devices [ 0.000000] Booting paravirtualized kernel on KVM [ 0.000000] clocksource: refined-jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns [ 0.000000] setup_percpu: NR_CPUS:64 nr_cpumask_bits:64 nr_cpu_ids:2 nr_node_ids:1 [ 0.000000] PERCPU: Embedded 42 pages/cpu @ffff8801db200000 s134024 r8192 d29816 u1048576 [ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 1935227 [ 0.000000] 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 workqueue.watchdog_thresh=120 nopti [ 0.000000] PID hash table entries: 4096 (order: 3, 32768 bytes) [ 0.000000] Dentry cache hash table entries: 1048576 (order: 11, 8388608 bytes) [ 0.000000] Inode-cache hash table entries: 524288 (order: 10, 4194304 bytes) [ 0.000000] Memory: 6579092K/7863876K available (41752K kernel code, 6301K rwdata, 9048K rodata, 1864K init, 23696K bss, 1284784K reserved, 0K cma-reserved) [ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=2, Nodes=1 [ 0.000000] Running RCU self tests [ 0.000000] Preemptible hierarchical RCU implementation. [ 0.000000] RCU lockdep checking is enabled. [ 0.000000] Build-time adjustment of leaf fanout to 64. [ 0.000000] RCU restricting CPUs from NR_CPUS=64 to nr_cpu_ids=2. [ 0.000000] RCU: Adjusting geometry for rcu_fanout_leaf=64, nr_cpu_ids=2 [ 0.000000] NR_IRQS:4352 nr_irqs:440 16 [ 0.000000] console [ttyS0] enabled [ 0.000000] console [ttyS0] enabled [ 0.000000] bootconsole [earlyser0] disabled [ 0.000000] bootconsole [earlyser0] disabled [ 0.000000] Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar [ 0.000000] ... MAX_LOCKDEP_SUBCLASSES: 8 [ 0.000000] ... MAX_LOCK_DEPTH: 48 [ 0.000000] ... MAX_LOCKDEP_KEYS: 8191 [ 0.000000] ... CLASSHASH_SIZE: 4096 [ 0.000000] ... MAX_LOCKDEP_ENTRIES: 32768 [ 0.000000] ... MAX_LOCKDEP_CHAINS: 65536 [ 0.000000] ... CHAINHASH_SIZE: 32768 [ 0.000000] memory used by lock dependency info: 8159 kB [ 0.000000] per task-struct memory footprint: 1920 bytes [ 0.000000] tsc: Detected 2300.000 MHz processor [ 1.134077] Calibrating delay loop (skipped) preset value.. 4600.00 BogoMIPS (lpj=23000000) [ 1.135268] pid_max: default: 32768 minimum: 301 [ 1.135994] ACPI: Core revision 20150930 [ 1.559340] ACPI: 2 ACPI AML tables successfully acquired and loaded [ 1.560639] Security Framework initialized [ 1.561207] SELinux: Initializing. [ 1.561865] AppArmor: AppArmor disabled by boot time parameter [ 1.562769] Mount-cache hash table entries: 16384 (order: 5, 131072 bytes) [ 1.563725] Mountpoint-cache hash table entries: 16384 (order: 5, 131072 bytes) [ 1.567382] Initializing cgroup subsys io [ 1.567996] Initializing cgroup subsys freezer [ 1.568640] Initializing cgroup subsys hugetlb [ 1.569316] Initializing cgroup subsys debug [ 1.570075] CPU: Physical Processor ID: 0 [ 1.571825] mce: CPU supports 32 MCE banks [ 1.572560] Last level iTLB entries: 4KB 1024, 2MB 1024, 4MB 1024 [ 1.573452] Last level dTLB entries: 4KB 1024, 2MB 1024, 4MB 1024, 1GB 4 [ 1.574359] Spectre V2 : Mitigation: Full generic retpoline [ 1.577380] Freeing SMP alternatives memory: 48K [ 1.587723] ..TIMER: vector=0x30 apic1=0 pin1=0 apic2=-1 pin2=-1 [ 1.703405] smpboot: CPU0: Intel(R) Xeon(R) CPU @ 2.30GHz (family: 0x6, model: 0x3f, stepping: 0x0) [ 1.704850] Performance Events: unsupported p6 CPU model 63 no PMU driver, software events only. [ 1.793661] x86: Booting SMP configuration: [ 1.794311] .... node #0, CPUs: #1 [ 1.795094] kvm-clock: cpu 1, msr 2:1fffd041, secondary cpu clock [ 1.799938] x86: Booted up 1 node, 2 CPUs [ 1.800508] smpboot: Total of 2 processors activated (9200.00 BogoMIPS) [ 1.804705] devtmpfs: initialized [ 1.814995] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns [ 1.816395] futex hash table entries: 512 (order: 4, 65536 bytes) [ 1.818326] xor: automatically using best checksumming function: [ 1.831179] kworker/u4:0 (21) used greatest stack depth: 27424 bytes left [ 1.913410] avx : 21623.600 MB/sec [ 1.914598] RTC time: 0:15:43, date: 05/19/18 [ 1.917735] NET: Registered protocol family 16 [ 1.918867] schedtune: init normalization constants... [ 1.919571] schedtune: no energy model data [ 1.920164] schedtune: disabled! [ 1.953662] cpuidle: using governor ladder [ 1.983442] cpuidle: using governor menu [ 1.984756] ACPI: bus type PCI registered [ 1.985344] acpiphp: ACPI Hot Plug PCI Controller Driver version: 0.5 [ 1.988310] PCI: Using configuration type 1 for base access [ 2.453387] raid6: sse2x1 gen() 4676 MB/s [ 2.623379] raid6: sse2x1 xor() 2606 MB/s [ 2.793361] raid6: sse2x2 gen() 7077 MB/s [ 2.963359] raid6: sse2x2 xor() 4054 MB/s [ 3.133346] raid6: sse2x4 gen() 8716 MB/s [ 3.303340] raid6: sse2x4 xor() 5348 MB/s [ 3.473329] raid6: avx2x1 gen() 9456 MB/s [ 3.643326] raid6: avx2x2 gen() 14741 MB/s [ 3.813314] raid6: avx2x4 gen() 19388 MB/s [ 3.813967] raid6: using algorithm avx2x4 gen() 19388 MB/s [ 3.814727] raid6: using avx2x2 recovery algorithm [ 3.816106] ACPI: Added _OSI(Module Device) [ 3.816753] ACPI: Added _OSI(Processor Device) [ 3.817386] ACPI: Added _OSI(3.0 _SCP Extensions) [ 3.818048] ACPI: Added _OSI(Processor Aggregator Device) [ 3.845304] ACPI: Executed 2 blocks of module-level executable AML code [ 4.792764] ACPI: Interpreter enabled [ 4.793709] ACPI: (supports S0 S3 S4 S5) [ 4.794258] ACPI: Using IOAPIC for interrupt routing [ 4.795408] PCI: Using host bridge windows from ACPI; if necessary, use "pci=nocrs" and report a bug [ 6.057411] ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-ff]) [ 6.058471] acpi PNP0A03:00: _OSC: OS supports [ASPM ClockPM Segments MSI] [ 6.059968] acpi PNP0A03:00: _OSC failed (AE_NOT_FOUND); disabling ASPM [ 6.061123] acpi PNP0A03:00: fail to add MMCONFIG information, can't access extended PCI configuration space under this bridge. [ 6.090796] PCI host bridge to bus 0000:00 [ 6.091437] pci_bus 0000:00: root bus resource [io 0x0000-0x0cf7 window] [ 6.092410] pci_bus 0000:00: root bus resource [io 0x0d00-0xffff window] [ 6.093377] pci_bus 0000:00: root bus resource [mem 0x000a0000-0x000bffff window] [ 6.094404] pci_bus 0000:00: root bus resource [mem 0xc0000000-0xfebfffff window] [ 6.095468] pci_bus 0000:00: root bus resource [bus 00-ff] [ 6.133587] pci 0000:00:01.3: quirk: [io 0xb000-0xb03f] claimed by PIIX4 ACPI [ 6.223894] ACPI: PCI Interrupt Link [LNKA] (IRQs 5 *10 11) [ 6.230285] ACPI: PCI Interrupt Link [LNKB] (IRQs 5 *10 11) [ 6.236401] ACPI: PCI Interrupt Link [LNKC] (IRQs 5 10 *11) [ 6.242473] ACPI: PCI Interrupt Link [LNKD] (IRQs 5 10 *11) [ 6.246117] ACPI: PCI Interrupt Link [LNKS] (IRQs *9) [ 6.841905] ACPI: Enabled 16 GPEs in block 00 to 0F [ 6.845705] vgaarb: loaded [ 6.849260] SCSI subsystem initialized [ 6.861552] ACPI: bus type USB registered [ 6.863342] usbcore: registered new interface driver usbfs [ 6.864970] usbcore: registered new interface driver hub [ 6.866046] usbcore: registered new device driver usb [ 6.868323] pps_core: LinuxPPS API ver. 1 registered [ 6.869076] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti [ 6.871179] PTP clock support registered [ 6.872989] ioremap error for 0xbfffd000-0xc0000000, requested 0x2, got 0x0 [ 6.874088] dmi: Firmware registration failed. [ 6.875610] Advanced Linux Sound Architecture Driver Initialized. [ 6.877268] PCI: Using ACPI for IRQ routing