[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.125982] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.815758] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 26.346861] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 27.353748] random: sshd: uninitialized urandom read (32 bytes read, 108 bits of entropy available) [ 27.530525] random: sshd: uninitialized urandom read (32 bytes read, 112 bits of entropy available) Warning: Permanently added '10.128.0.10' (ECDSA) to the list of known hosts. [ 33.066644] random: sshd: uninitialized urandom read (32 bytes read, 119 bits of entropy available) executing program [ 33.162311] ================================================================== [ 33.169699] BUG: KASAN: slab-out-of-bounds in ip6_xmit+0x1a2c/0x1a70 [ 33.176165] Read of size 8 at addr ffff8801cbb98658 by task syzkaller926099/3782 [ 33.183667] [ 33.185270] CPU: 1 PID: 3782 Comm: syzkaller926099 Not tainted 4.4.120-gd63fdf6 #28 [ 33.193032] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.202355] 0000000000000000 bac76aeb48896edd ffff8800bb93f6a8 ffffffff81d0408d [ 33.210324] ffffea00072ee600 ffff8801cbb98658 0000000000000000 ffff8801cbb98658 [ 33.218289] 0000000000000040 ffff8800bb93f6e0 ffffffff814fe143 ffff8801cbb98658 [ 33.226265] Call Trace: [ 33.228832] [] dump_stack+0xc1/0x124 [ 33.234173] [] print_address_description+0x73/0x260 [ 33.240809] [] kasan_report+0x285/0x370 [ 33.246403] [] ? ip6_xmit+0x1a2c/0x1a70 [ 33.251996] [] __asan_report_load8_noabort+0x14/0x20 [ 33.258715] [] ip6_xmit+0x1a2c/0x1a70 [ 33.264135] [] ? save_trace+0xe0/0x270 [ 33.269645] [] ? pskb_expand_head+0x28b/0x980 [ 33.275756] [] ? ip6_finish_output2+0x1c60/0x1c60 [ 33.282215] [] ? __lock_is_held+0xa1/0xf0 [ 33.287981] [] ? ipv4_dst_check+0x111/0x160 [ 33.293922] [] ? __sk_dst_check+0x148/0x260 [ 33.300280] [] inet6_csk_xmit+0x246/0x480 [ 33.306050] [] ? inet6_csk_xmit+0x100/0x480 [ 33.311994] [] ? inet6_csk_update_pmtu+0x160/0x160 [ 33.318545] [] ? udp6_set_csum+0x336/0xa80 [ 33.324397] [] l2tp_xmit_skb+0xc2f/0xea0 [ 33.330076] [] pppol2tp_sendmsg+0x584/0x7f0 [ 33.336020] [] ? selinux_socket_sendmsg+0x3f/0x50 [ 33.342479] [] ? pppol2tp_release+0x310/0x310 [ 33.348592] [] sock_sendmsg+0xca/0x110 [ 33.354095] [] ___sys_sendmsg+0x6c1/0x7c0 [ 33.359859] [] ? copy_msghdr_from_user+0x550/0x550 [ 33.366408] [] ? check_preemption_disabled+0x3b/0x200 [ 33.373218] [] ? do_huge_pmd_anonymous_page+0x549/0xa10 [ 33.380200] [] ? _raw_spin_unlock+0x2c/0x50 [ 33.386176] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 33.393159] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 33.399878] [] ? __fget_light+0xa3/0x1e0 [ 33.405555] [] ? __fdget+0x18/0x20 [ 33.410716] [] __sys_sendmsg+0xd3/0x190 [ 33.416309] [] ? SyS_shutdown+0x1b0/0x1b0 [ 33.422076] [] ? __do_page_fault+0x380/0xa00 [ 33.428104] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 33.434912] [] SyS_sendmsg+0x2d/0x50 [ 33.440254] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 33.446800] [ 33.448507] Allocated by task 0: [ 33.451839] (stack is not available) [ 33.455516] [ 33.457111] Freed by task 0: [ 33.460096] (stack is not available) [ 33.463771] [ 33.465368] The buggy address belongs to the object at ffff8801cbb98640 [ 33.465368] which belongs to the cache ip_dst_cache of size 208 [ 33.478075] The buggy address is located 24 bytes inside of [ 33.478075] 208-byte region [ffff8801cbb98640, ffff8801cbb98710) [ 33.489828] The buggy address belongs to the page: [ 33.505827] kasan: CONFIG_KASAN_INLINE enabled [ 33.510241] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 33.523054] Dumping ftrace buffer: [ 33.526568] (ftrace buffer empty) [ 33.530255] Modules linked in: [ 33.533536] CPU: 0 PID: 0SeaBIOS (version 1.8.2-20171120_144221-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 0x000f2360: PCHS=0/0/0 translation=lba LCHS=520/128/63 s=4194304 Booting from Hard Disk 0... early console in decompress_kernel input_data: 0x00000000037cb26e input_len: 0x0000000001423b2c output: 0x0000000001000000 output_len: 0x0000000003bdaa40 run_size: 0x0000000005310000 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 4.4.120-gd63fdf6 (syzkaller@ci) (gcc version 7.1.1 20170620 (GCC) ) #28 SMP PREEMPT Tue Mar 6 13:16:06 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 [ 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] 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 0x000f23e0-0x000f23ef] mapped at [ffff8800000f23e0] [ 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 0x00000000000F23A0 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 2143271832 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 [ 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: 6581404K/7863876K available (40422K kernel code, 6136K rwdata, 8808K rodata, 1848K init, 23616K bss, 1282472K reserved, 0K cma-reserved) [ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=2, Nodes=1 [ 0.000000] Kernel/User page tables isolation: enabled [ 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 [ 1.120946] Calibrating delay loop (skipped) preset value.. 4600.00 BogoMIPS (lpj=23000000) [ 1.122096] pid_max: default: 32768 minimum: 301 [ 1.122815] ACPI: Core revision 20150930 [ 1.540765] ACPI: 2 ACPI AML tables successfully acquired and loaded [ 1.542704] Security Framework initialized [ 1.543293] SELinux: Initializing. [ 1.543945] AppArmor: AppArmor disabled by boot time parameter [ 1.544863] Mount-cache hash table entries: 16384 (order: 5, 131072 bytes) [ 1.545788] Mountpoint-cache hash table entries: 16384 (order: 5, 131072 bytes) [ 1.549435] Initializing cgroup subsys io [ 1.550032] Initializing cgroup subsys freezer [ 1.550729] Initializing cgroup subsys hugetlb [ 1.551395] Initializing cgroup subsys debug [ 1.552200] CPU: Physical Processor ID: 0 [ 1.554120] mce: CPU supports 32 MCE banks [ 1.554876] Last level iTLB entries: 4KB 1024, 2MB 1024, 4MB 1024 [ 1.555721] Last level dTLB entries: 4KB 1024, 2MB 1024, 4MB 1024, 1GB 4 [ 1.556624] Spectre V2 : Vulnerable: Minimal generic ASM retpoline [ 1.559739] Freeing SMP alternatives memory: 44K [ 1.569504] ..TIMER: vector=0x30 apic1=0 pin1=0 apic2=-1 pin2=-1 [ 1.690285] smpboot: CPU0: Intel(R) Xeon(R) CPU @ 2.30GHz (family: 0x6, model: 0x3f, stepping: 0x0) [ 1.691754] Performance Events: unsupported p6 CPU model 63 no PMU driver, software events only. [ 1.780510] x86: Booting SMP configuration: [ 1.781222] .... node #0, CPUs: #1 [ 1.781987] kvm-clock: cpu 1, msr 2:1fffd041, secondary cpu clock [ 1.786858] x86: Booted up 1 node, 2 CPUs [ 1.787473] smpboot: Total of 2 processors activated (9200.00 BogoMIPS) [ 1.792124] devtmpfs: initialized [ 1.801501] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns [ 1.802890] futex hash table entries: 512 (order: 4, 65536 bytes) [ 1.804484] xor: automatically using best checksumming function: [ 1.818080] kworker/u4:0 (21) used greatest stack depth: 27944 bytes left [ 1.900301] avx : 21693.600 MB/sec [ 1.901593] RTC time: 22:05:38, date: 03/06/18 [ 1.903906] NET: Registered protocol family 16 [ 1.904964] schedtune: init normalization constants... [ 1.905664] schedtune: no energy model data [ 1.906241] schedtune: disabled! [ 1.940481] cpuidle: using governor ladder [ 1.970311] cpuidle: using governor menu [ 1.971548] ACPI: bus type PCI registered [ 1.972133] acpiphp: ACPI Hot Plug PCI Controller Driver version: 0.5 [ 1.974945] PCI: Using configuration type 1 for base access [ 1.986458] kworker/u4:0 (45) used greatest stack depth: 27448 bytes left [ 2.410267] raid6: sse2x1 gen() 4799 MB/s [ 2.580198] raid6: sse2x1 xor() 2601 MB/s [ 2.750182] raid6: sse2x2 gen() 7057 MB/s [ 2.920159] raid6: sse2x2 xor() 4082 MB/s [ 3.090139] raid6: sse2x4 gen() 8711 MB/s [ 3.260124] raid6: sse2x4 xor() 5305 MB/s [ 3.430098] raid6: avx2x1 gen() 9463 MB/s [ 3.600085] raid6: avx2x2 gen() 14637 MB/s [ 3.770063] raid6: avx2x4 gen() 19132 MB/s [ 3.770718] raid6: using algorithm avx2x4 gen() 19132 MB/s [ 3.771474] raid6: using avx2x2 recovery algorithm [ 3.772773] ACPI: Added _OSI(Module Device) [ 3.773385] ACPI: Added _OSI(Processor Device) [ 3.773996] ACPI: Added _OSI(3.0 _SCP Extensions) [ 3.774640] ACPI: Added _OSI(Processor Aggregator Device) [ 3.800351] ACPI: Executed 2 blocks of module-level executable AML code [ 4.634463] ACPI: Interpreter enabled [ 4.635435] ACPI: (supports S0 S3 S4 S5) [ 4.636015] ACPI: Using IOAPIC for interrupt routing [ 4.637166] PCI: Using host bridge windows from ACPI; if necessary, use "pci=nocrs" and report a bug [ 5.764691] ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-ff]) [ 5.765712] acpi PNP0A03:00: _OSC: OS supports [ASPM ClockPM Segments MSI] [ 5.767339] acpi PNP0A03:00: _OSC failed (AE_NOT_FOUND); disabling ASPM [ 5.768359] acpi PNP0A03:00: fail to add MMCONFIG information, can't access extended PCI configuration space under this bridge. [ 5.793681] PCI host bridge to bus 0000:00 [ 5.794296] pci_bus 0000:00: root bus resource [io 0x0000-0x0cf7 window] [ 5.795227] pci_bus 0000:00: root bus resource [io 0x0d00-0xffff window] [ 5.796157] pci_bus 0000:00: root bus resource [mem 0x000a0000-0x000bffff window] [ 5.797212] pci_bus 0000:00: root bus resource [mem 0xc0000000-0xfebfffff window] [ 5.798243] pci_bus 0000:00: root bus resource [bus 00-ff] [ 5.833023] pci 0000:00:01.3: quirk: [io 0xb000-0xb03f] claimed by PIIX4 ACPI [ 5.909251] ACPI: PCI Interrupt Link [LNKA] (IRQs 5 *10 11) [ 5.914818] ACPI: PCI Interrupt Link [LNKB] (IRQs 5 *10 11) [ 5.920225] ACPI: PCI Interrupt Link [LNKC] (IRQs 5 10 *11) [ 5.925571] ACPI: PCI Interrupt Link [LNKD] (IRQs 5 10 *11) [ 5.928781] ACPI: PCI Interrupt Link [LNKS] (IRQs *9) [ 6.462519] ACPI: Enabled 16 GPEs in block 00 to 0F [ 6.466129] vgaarb: loaded [ 6.470005] SCSI subsystem initialized [ 6.488337] ACPI: bus type USB registered [ 6.490516] usbcore: registered new interface driver usbfs [ 6.491906] usbcore: registered new interface driver hub [ 6.493146] usbcore: registered new device driver usb [ 6.495449] pps_core: LinuxPPS API ver. 1 registered [ 6.496553] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti [ 6.497898] PTP clock support registered [ 6.499827] ioremap error for 0xbfffd000-0xc0000000, requested 0x2, got 0x0 [ 6.501445] dmi: Firmware registration failed. [ 6.502819] Advanced Linux Sound Architecture Driver Initialized. [ 6.504375] PCI: Using ACPI for IRQ routing [ 6.512211] NetLabel: Initializing [ 6.512747] NetLabel: domain hash size = 128 [ 6.513368] NetLabel: protocols = UNLABELED CIPSOv4 [ 6.514315] NetLabel: unlabeled traffic allowed by default [ 6.516699] amd_nb: Cannot enumerate AMD northbridges [ 6.517550] clocksource: Switched to clocksource kvm-clock [ 6.674449] pnp: PnP ACPI init