[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 23.107945] 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: [ 27.852025] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 28.197407] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 29.123703] random: sshd: uninitialized urandom read (32 bytes read, 104 bits of entropy available) [ 29.285126] random: sshd: uninitialized urandom read (32 bytes read, 108 bits of entropy available) Warning: Permanently added '10.128.0.38' (ECDSA) to the list of known hosts. [ 34.668951] random: sshd: uninitialized urandom read (32 bytes read, 115 bits of entropy available) executing program [ 34.769965] ================================================================== [ 34.777366] BUG: KASAN: use-after-free in __lock_acquire+0x387e/0x4b50 [ 34.784004] Read of size 8 at addr ffff8800ad1cb238 by task syzkaller738836/4047 [ 34.791502] [ 34.793103] CPU: 0 PID: 4047 Comm: syzkaller738836 Not tainted 4.4.113-g962d1f3 #2 [ 34.800774] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.810100] 0000000000000000 50642cce3ab49d5a ffff8800baf67870 ffffffff81d028ed [ 34.818088] ffffea0002b47280 ffff8800ad1cb238 0000000000000000 ffff8800ad1cb238 [ 34.826048] 0000000000000000 ffff8800baf678a8 ffffffff814fd1c3 ffff8800ad1cb238 [ 34.834017] Call Trace: [ 34.836575] [] dump_stack+0xc1/0x124 [ 34.841911] [] print_address_description+0x73/0x260 [ 34.848548] [] kasan_report+0x285/0x370 [ 34.854141] [] ? __lock_acquire+0x387e/0x4b50 [ 34.860254] [] __asan_report_load8_noabort+0x14/0x20 [ 34.866973] [] __lock_acquire+0x387e/0x4b50 [ 34.872914] [] ? __lock_acquire+0xb5f/0x4b50 [ 34.878942] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 34.885921] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 34.892727] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 34.899709] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 34.906690] [] lock_acquire+0x15e/0x460 [ 34.912282] [] ? remove_wait_queue+0x14/0x40 [ 34.918309] [] _raw_spin_lock_irqsave+0x4e/0x70 [ 34.924605] [] ? remove_wait_queue+0x14/0x40 [ 34.930634] [] remove_wait_queue+0x14/0x40 [ 34.936488] [] ep_unregister_pollwait.isra.6+0xa8/0x220 [ 34.943480] [] ? ep_unregister_pollwait.isra.6+0x114/0x220 [ 34.950723] [] ? ep_free+0x1c0/0x1c0 [ 34.956054] [] ep_free+0x93/0x1c0 [ 34.961125] [] ? ep_free+0x1c0/0x1c0 [ 34.966459] [] ep_eventpoll_release+0x44/0x60 [ 34.972574] [] __fput+0x233/0x6d0 [ 34.977647] [] ____fput+0x15/0x20 [ 34.982721] [] task_work_run+0x104/0x180 [ 34.988404] [] do_exit+0x82a/0x2a10 [ 34.993656] [] ? release_task+0x1240/0x1240 [ 34.999596] [] do_group_exit+0x108/0x320 [ 35.005276] [] SyS_exit_group+0x1d/0x20 [ 35.010870] [] ? do_group_exit+0x320/0x320 [ 35.016722] [] do_fast_syscall_32+0x314/0x890 [ 35.022838] [] sysenter_flags_fixed+0xd/0x17 [ 35.028863] [ 35.030458] Allocated by task 4047: [ 35.034054] [] save_stack_trace+0x26/0x50 [ 35.039955] [] save_stack+0x43/0xd0 [ 35.045322] [] kasan_kmalloc+0xad/0xe0 [ 35.050947] [] kmem_cache_alloc_trace+0x100/0x2b0 [ 35.057554] [] binder_get_thread+0x15d/0x750 [ 35.063697] [] binder_poll+0x4a/0x210 [ 35.069231] [] SyS_epoll_ctl+0x10b1/0x2040 [ 35.075202] [] do_fast_syscall_32+0x314/0x890 [ 35.081433] [] sysenter_flags_fixed+0xd/0x17 [ 35.087588] [ 35.089183] Freed by task 4047: [ 35.092427] [] save_stack_trace+0x26/0x50 [ 35.098307] [] save_stack+0x43/0xd0 [ 35.103671] [] kasan_slab_free+0x72/0xc0 [ 35.109463] [] kfree+0xfc/0x300 [ 35.114487] [] binder_thread_dec_tmpref+0x1c1/0x250 [ 35.121255] [] binder_thread_release+0x27d/0x540 [ 35.127791] [] binder_ioctl+0xb94/0x12e0 [ 35.133621] [] compat_SyS_ioctl+0x28a/0x2540 [ 35.139781] [] do_fast_syscall_32+0x314/0x890 [ 35.146019] [] sysenter_flags_fixed+0xd/0x17 [ 35.152164] [ 35.153762] The buggy address belongs to the object at ffff8800ad1cb180 [ 35.153762] which belongs to the cache kmalloc-512 of size 512 [ 35.166401] The buggy address is located 184 bytes inside of [ 35.166401] 512-byte region [ffff8800ad1cb180, ffff8800ad1cb380) [ 35.178241] The buggy address belongs to the page: [ 35.199310] kasan: CONFIG_KASAN_INLINE enabled [ 35.203758] kasan: GPF could be causeSeaBIOS (version 1.8.2-20171012_061934-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 0x000f2850: PCHS=0/0/0 translation=lba LCHS=520/128/63 s=4194304 Booting from Hard Disk 0... early console in decompress_kernel input_data: 0x00000000039cb26e input_len: 0x000000000142468c output: 0x0000000001000000 output_len: 0x0000000003ddaa40 run_size: 0x0000000005510000 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 4.4.113-g962d1f3 (syzkaller@ci) (gcc version 7.1.1 20170620 (GCC) ) #2 SMP PREEMPT Mon Jan 29 16:47:11 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 0x000f28d0-0x000f28df] mapped at [ffff8800000f28d0] [ 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 0x00000000000F2890 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 1873321141 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 (40414K kernel code, 6135K rwdata, 8812K rodata, 1852K 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 [ 1.215094] Calibrating delay loop (skipped) preset value.. 4600.00 BogoMIPS (lpj=23000000) [ 1.216244] pid_max: default: 32768 minimum: 301 [ 1.216949] ACPI: Core revision 20150930 [ 1.638249] ACPI: 2 ACPI AML tables successfully acquired and loaded [ 1.640214] Security Framework initialized [ 1.640790] SELinux: Initializing. [ 1.641438] AppArmor: AppArmor disabled by boot time parameter [ 1.642366] Mount-cache hash table entries: 16384 (order: 5, 131072 bytes) [ 1.643293] Mountpoint-cache hash table entries: 16384 (order: 5, 131072 bytes) [ 1.647046] Initializing cgroup subsys io [ 1.647665] Initializing cgroup subsys freezer [ 1.648323] Initializing cgroup subsys hugetlb [ 1.648947] Initializing cgroup subsys debug [ 1.649710] CPU: Physical Processor ID: 0 [ 1.651640] mce: CPU supports 32 MCE banks [ 1.652427] Last level iTLB entries: 4KB 1024, 2MB 1024, 4MB 1024 [ 1.653257] Last level dTLB entries: 4KB 1024, 2MB 1024, 4MB 1024, 1GB 4 [ 1.654188] Spectre V2 mitigation: Vulnerable: Minimal generic ASM retpoline [ 1.657536] Freeing SMP alternatives memory: 44K [ 1.667017] ..TIMER: vector=0x30 apic1=0 pin1=0 apic2=-1 pin2=-1 [ 1.784410] smpboot: CPU0: Intel(R) Xeon(R) CPU @ 2.30GHz (family: 0x6, model: 0x3f, stepping: 0x0) [ 1.785879] Performance Events: unsupported p6 CPU model 63 no PMU driver, software events only. [ 1.874655] x86: Booting SMP configuration: [ 1.875314] .... node #0, CPUs: #1 [ 1.876090] kvm-clock: cpu 1, msr 2:1fffd041, secondary cpu clock [ 1.881028] x86: Booted up 1 node, 2 CPUs [ 1.881636] smpboot: Total of 2 processors activated (9200.00 BogoMIPS) [ 1.886366] devtmpfs: initialized [ 1.896086] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns [ 1.897477] futex hash table entries: 512 (order: 4, 65536 bytes) [ 1.899181] xor: automatically using best checksumming function: [ 1.912152] kworker/u4:0 (21) used greatest stack depth: 28008 bytes left [ 1.994421] avx : 21570.800 MB/sec [ 1.995619] RTC time: 22:03:55, date: 01/29/18 [ 1.997915] NET: Registered protocol family 16 [ 1.999013] schedtune: init normalization constants... [ 1.999761] schedtune: no energy model data [ 2.000337] schedtune: disabled! [ 2.005243] kworker/u4:0 (30) used greatest stack depth: 27144 bytes left [ 2.034617] cpuidle: using governor ladder [ 2.064435] cpuidle: using governor menu [ 2.065781] ACPI: bus type PCI registered [ 2.066374] acpiphp: ACPI Hot Plug PCI Controller Driver version: 0.5 [ 2.069224] PCI: Using configuration type 1 for base access [ 2.514368] raid6: sse2x1 gen() 4801 MB/s [ 2.684347] raid6: sse2x1 xor() 2547 MB/s [ 2.854341] raid6: sse2x2 gen() 7583 MB/s [ 3.024324] raid6: sse2x2 xor() 4350 MB/s [ 3.194301] raid6: sse2x4 gen() 9853 MB/s [ 3.364284] raid6: sse2x4 xor() 5696 MB/s [ 3.534275] raid6: avx2x1 gen() 9374 MB/s [ 3.704249] raid6: avx2x2 gen() 14689 MB/s [ 3.874237] raid6: avx2x4 gen() 19237 MB/s [ 3.874913] raid6: using algorithm avx2x4 gen() 19237 MB/s [ 3.875693] raid6: using avx2x2 recovery algorithm [ 3.876995] ACPI: Added _OSI(Module Device) [ 3.877660] ACPI: Added _OSI(Processor Device) [ 3.878272] ACPI: Added _OSI(3.0 _SCP Extensions) [ 3.878944] ACPI: Added _OSI(Processor Aggregator Device) [ 3.904727] ACPI: Executed 2 blocks of module-level executable AML code [ 4.767165] ACPI: Interpreter enabled [ 4.768128] ACPI: (supports S0 S3 S4 S5) [ 4.768675] ACPI: Using IOAPIC for interrupt routing [ 4.769807] PCI: Using host bridge windows from ACPI; if necessary, use "pci=nocrs" and report a bug [ 5.932093] ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-ff]) [ 5.933099] acpi PNP0A03:00: _OSC: OS supports [ASPM ClockPM Segments MSI] [ 5.934683] acpi PNP0A03:00: _OSC failed (AE_NOT_FOUND); disabling ASPM [ 5.935798] acpi PNP0A03:00: fail to add MMCONFIG information, can't access extended PCI configuration space under this bridge. [ 5.962817] PCI host bridge to bus 0000:00 [ 5.963458] pci_bus 0000:00: root bus resource [io 0x0000-0x0cf7 window] [ 5.964390] pci_bus 0000:00: root bus resource [io 0x0d00-0xffff window] [ 5.965358] pci_bus 0000:00: root bus resource [mem 0x000a0000-0x000bffff window] [ 5.966441] pci_bus 0000:00: root bus resource [mem 0xc0000000-0xfebfffff window] [ 5.967461] pci_bus 0000:00: root bus resource [bus 00-ff] [ 6.004671] pci 0000:00:01.3: quirk: [io 0xb000-0xb03f] claimed by PIIX4 ACPI [ 6.087988] ACPI: PCI Interrupt Link [LNKA] (IRQs 5 *10 11) [ 6.094414] ACPI: PCI Interrupt Link [LNKB] (IRQs 5 *10 11) [ 6.100177] ACPI: PCI Interrupt Link [LNKC] (IRQs 5 10 *11) [ 6.105840] ACPI: PCI Interrupt Link [LNKD] (IRQs 5 10 *11) [ 6.109178] ACPI: PCI Interrupt Link [LNKS] (IRQs *9) [ 6.659046] ACPI: Enabled 16 GPEs in block 00 to 0F [ 6.662671] vgaarb: loaded [ 6.665901] SCSI subsystem initialized [ 6.675760] ACPI: bus type USB registered [ 6.677815] usbcore: registered new interface driver usbfs [ 6.679485] usbcore: registered new interface driver hub [ 6.680704] usbcore: registered new device driver usb [ 6.682910] pps_core: LinuxPPS API ver. 1 registered [ 6.684237] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti [ 6.685787] PTP clock support registered [ 6.687784] ioremap error for 0xbfffd000-0xc0000000, requested 0x2, got 0x0 [ 6.688997] dmi: Firmware registration failed. [ 6.690486] Advanced Linux Sound Architecture Driver Initialized. [ 6.692113] PCI: Using ACPI for IRQ routing [ 6.700966] NetLabel: Initializing [ 6.701489] NetLabel: domain hash size = 128 [ 6.702136] NetLabel: protocols = UNLABELED CIPSOv4 [ 6.703087] NetLabel: unlabeled traffic allowed by default [ 6.705704] amd_nb: Cannot enumerate AMD northbridges [ 6.706596] clocksource: Switched to clocksource kvm-clock