[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.855851] 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: [ 24.574791] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 24.945149] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 25.847105] random: sshd: uninitialized urandom read (32 bytes read, 105 bits of entropy available) [ 26.023671] random: sshd: uninitialized urandom read (32 bytes read, 110 bits of entropy available) Warning: Permanently added '10.128.0.40' (ECDSA) to the list of known hosts. [ 31.450027] random: sshd: uninitialized urandom read (32 bytes read, 117 bits of entropy available) executing program [ 31.553865] ================================================================== [ 31.561234] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 31.568215] Read of size 8 at addr ffff8800aeed2140 by task syzkaller120933/3785 [ 31.575712] [ 31.577308] CPU: 1 PID: 3785 Comm: syzkaller120933 Not tainted 4.4.120-gd63fdf6 #28 [ 31.585077] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.594400] 0000000000000000 5701b44becfdbd61 ffff8800aa4b7ab0 ffffffff81d0408d [ 31.602358] ffffea0002bbb480 ffff8800aeed2140 0000000000000000 ffff8800aeed2140 [ 31.610315] ffff8800bb242338 ffff8800aa4b7ae8 ffffffff814fe143 ffff8800aeed2140 [ 31.618272] Call Trace: [ 31.620834] [] dump_stack+0xc1/0x124 [ 31.626172] [] print_address_description+0x73/0x260 [ 31.632812] [] kasan_report+0x285/0x370 [ 31.638403] [] ? sg_remove_request+0xf9/0x110 [ 31.644512] [] __asan_report_load8_noabort+0x14/0x20 [ 31.651234] [] sg_remove_request+0xf9/0x110 [ 31.657170] [] sg_finish_rem_req+0x295/0x340 [ 31.663195] [] sg_read+0xa1b/0x1490 [ 31.668439] [] ? new_slab+0x24f/0x3b0 [ 31.673859] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 31.680492] [] ? __raw_spin_lock_init+0x1c/0x100 [ 31.686861] [] ? lockdep_init_map+0xeb/0x1690 [ 31.692973] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 31.699606] [] __vfs_read+0x103/0x440 [ 31.705022] [] ? vfs_iter_write+0x2d0/0x2d0 [ 31.710960] [] ? fsnotify+0x5ad/0xee0 [ 31.716375] [] ? fsnotify+0xee0/0xee0 [ 31.721800] [] ? fasync_helper+0x7a/0xb0 [ 31.727481] [] ? avc_policy_seqno+0x9/0x20 [ 31.733331] [] ? selinux_file_permission+0x348/0x460 [ 31.740050] [] ? security_file_permission+0x89/0x1e0 [ 31.746768] [] ? rw_verify_area+0x100/0x2f0 [ 31.752708] [] vfs_read+0x123/0x3a0 [ 31.757948] [] SyS_read+0xd9/0x1b0 [ 31.763104] [] ? do_sendfile+0xd30/0xd30 [ 31.768781] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 31.775240] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 31.781783] [ 31.783379] Allocated by task 0: [ 31.786707] (stack is not available) [ 31.790383] [ 31.791976] Freed by task 0: [ 31.794958] (stack is not available) [ 31.798632] [ 31.800239] The buggy address belongs to the object at ffff8800aeed2100 [ 31.800239] which belongs to the cache fasync_cache of size 96 [ 31.812861] The buggy address is located 64 bytes inside of [ 31.812861] 96-byte region [ffff8800aeed2100, ffff8800aeed2160) [ 31.824527] The buggy address belongs to the page: SeaBIOS (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 2136858523 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 [ 1.103955] Calibrating delay loop (skipped) preset value.. 4600.00 BogoMIPS (lpj=23000000) [ 1.105124] pid_max: default: 32768 minimum: 301 [ 1.105824] ACPI: Core revision 20150930 [ 1.523938] ACPI: 2 ACPI AML tables successfully acquired and loaded [ 1.525821] Security Framework initialized [ 1.526394] SELinux: Initializing. [ 1.527046] AppArmor: AppArmor disabled by boot time parameter [ 1.527946] Mount-cache hash table entries: 16384 (order: 5, 131072 bytes) [ 1.528892] Mountpoint-cache hash table entries: 16384 (order: 5, 131072 bytes) [ 1.532520] Initializing cgroup subsys io [ 1.533153] Initializing cgroup subsys freezer [ 1.533846] Initializing cgroup subsys hugetlb [ 1.534472] Initializing cgroup subsys debug [ 1.535236] CPU: Physical Processor ID: 0 [ 1.536969] mce: CPU supports 32 MCE banks [ 1.537775] Last level iTLB entries: 4KB 1024, 2MB 1024, 4MB 1024 [ 1.538602] Last level dTLB entries: 4KB 1024, 2MB 1024, 4MB 1024, 1GB 4 [ 1.539505] Spectre V2 : Vulnerable: Minimal generic ASM retpoline [ 1.542604] Freeing SMP alternatives memory: 44K [ 1.551850] ..TIMER: vector=0x30 apic1=0 pin1=0 apic2=-1 pin2=-1 [ 1.663273] smpboot: CPU0: Intel(R) Xeon(R) CPU @ 2.30GHz (family: 0x6, model: 0x3f, stepping: 0x0) [ 1.664804] Performance Events: unsupported p6 CPU model 63 no PMU driver, software events only. [ 1.753500] x86: Booting SMP configuration: [ 1.754182] .... node #0, CPUs: #1 [ 1.755018] kvm-clock: cpu 1, msr 2:1fffd041, secondary cpu clock [ 1.759752] x86: Booted up 1 node, 2 CPUs [ 1.760336] smpboot: Total of 2 processors activated (9200.00 BogoMIPS) [ 1.764960] devtmpfs: initialized [ 1.774264] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns [ 1.775622] futex hash table entries: 512 (order: 4, 65536 bytes) [ 1.777268] xor: automatically using best checksumming function: [ 1.780556] kworker/u4:0 (21) used greatest stack depth: 27944 bytes left [ 1.873285] avx : 21648.400 MB/sec [ 1.874424] RTC time: 5:06:34, date: 03/10/18 [ 1.876655] NET: Registered protocol family 16 [ 1.877764] schedtune: init normalization constants... [ 1.878506] schedtune: no energy model data [ 1.879102] schedtune: disabled! [ 1.913459] cpuidle: using governor ladder [ 1.943301] cpuidle: using governor menu [ 1.944544] ACPI: bus type PCI registered [ 1.945104] acpiphp: ACPI Hot Plug PCI Controller Driver version: 0.5 [ 1.947885] PCI: Using configuration type 1 for base access [ 1.958951] kworker/u4:0 (47) used greatest stack depth: 27448 bytes left [ 1.962495] kworker/u4:0 (50) used greatest stack depth: 27080 bytes left [ 2.353282] raid6: sse2x1 gen() 4595 MB/s [ 2.523254] raid6: sse2x1 xor() 2631 MB/s [ 2.693244] raid6: sse2x2 gen() 7519 MB/s [ 2.863242] raid6: sse2x2 xor() 4292 MB/s [ 3.033224] raid6: sse2x4 gen() 9806 MB/s [ 3.203217] raid6: sse2x4 xor() 5694 MB/s [ 3.373229] raid6: avx2x1 gen() 9355 MB/s [ 3.543198] raid6: avx2x2 gen() 14458 MB/s [ 3.713188] raid6: avx2x4 gen() 18735 MB/s [ 3.713889] raid6: using algorithm avx2x4 gen() 18735 MB/s [ 3.714632] raid6: using avx2x2 recovery algorithm [ 3.715960] ACPI: Added _OSI(Module Device) [ 3.716592] ACPI: Added _OSI(Processor Device) [ 3.717204] ACPI: Added _OSI(3.0 _SCP Extensions) [ 3.717885] ACPI: Added _OSI(Processor Aggregator Device) [ 3.743475] ACPI: Executed 2 blocks of module-level executable AML code [ 4.577513] ACPI: Interpreter enabled [ 4.578508] ACPI: (supports S0 S3 S4 S5) [ 4.579069] ACPI: Using IOAPIC for interrupt routing [ 4.580255] PCI: Using host bridge windows from ACPI; if necessary, use "pci=nocrs" and report a bug [ 5.705786] ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-ff]) [ 5.706814] acpi PNP0A03:00: _OSC: OS supports [ASPM ClockPM Segments MSI] [ 5.708117] acpi PNP0A03:00: _OSC failed (AE_NOT_FOUND); disabling ASPM [ 5.709114] acpi PNP0A03:00: fail to add MMCONFIG information, can't access extended PCI configuration space under this bridge. [ 5.734724] PCI host bridge to bus 0000:00 [ 5.735345] pci_bus 0000:00: root bus resource [io 0x0000-0x0cf7 window] [ 5.736331] pci_bus 0000:00: root bus resource [io 0x0d00-0xffff window] [ 5.737352] pci_bus 0000:00: root bus resource [mem 0x000a0000-0x000bffff window] [ 5.738415] pci_bus 0000:00: root bus resource [mem 0xc0000000-0xfebfffff window] [ 5.739464] pci_bus 0000:00: root bus resource [bus 00-ff] [ 5.775709] pci 0000:00:01.3: quirk: [io 0xb000-0xb03f] claimed by PIIX4 ACPI [ 5.855254] ACPI: PCI Interrupt Link [LNKA] (IRQs 5 *10 11)