[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.994418] 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: [ 26.290760] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 26.884064] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 27.867258] random: sshd: uninitialized urandom read (32 bytes read, 113 bits of entropy available) [ 28.047711] random: sshd: uninitialized urandom read (32 bytes read, 118 bits of entropy available) Warning: Permanently added '10.128.0.50' (ECDSA) to the list of known hosts. [ 33.645015] random: sshd: uninitialized urandom read (32 bytes read, 126 bits of entropy available) executing program [ 33.736833] ================================================================== [ 33.744226] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 33.751210] Read of size 8 at addr ffff8801cbbda140 by task syzkaller780862/3792 [ 33.758708] [ 33.760307] CPU: 0 PID: 3792 Comm: syzkaller780862 Not tainted 4.4.120-gd63fdf6 #28 [ 33.768075] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.777412] 0000000000000000 d38215dd02dc4245 ffff8801d94afab0 ffffffff81d0408d [ 33.785422] ffffea00072ef680 ffff8801cbbda140 0000000000000000 ffff8801cbbda140 [ 33.793398] ffff8801d9290238 ffff8801d94afae8 ffffffff814fe143 ffff8801cbbda140 [ 33.801357] Call Trace: [ 33.803916] [] dump_stack+0xc1/0x124 [ 33.809247] [] print_address_description+0x73/0x260 [ 33.815884] [] kasan_report+0x285/0x370 [ 33.821480] [] ? sg_remove_request+0xf9/0x110 [ 33.827593] [] __asan_report_load8_noabort+0x14/0x20 [ 33.834315] [] sg_remove_request+0xf9/0x110 [ 33.840255] [] sg_finish_rem_req+0x295/0x340 [ 33.846280] [] sg_read+0xa1b/0x1490 [ 33.851527] [] ? quarantine_reduce+0xc5/0x1d0 [ 33.857647] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 33.864283] [] ? __raw_spin_lock_init+0x1c/0x100 [ 33.870657] [] ? lockdep_init_map+0xeb/0x1690 [ 33.876775] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 33.883443] [] __vfs_read+0x103/0x440 [ 33.888862] [] ? vfs_iter_write+0x2d0/0x2d0 [ 33.894800] [] ? fsnotify+0x5ad/0xee0 [ 33.900226] [] ? fsnotify+0xee0/0xee0 [ 33.905654] [] ? fasync_helper+0x7a/0xb0 [ 33.911333] [] ? avc_policy_seqno+0x9/0x20 [ 33.917185] [] ? selinux_file_permission+0x348/0x460 [ 33.923907] [] ? security_file_permission+0x89/0x1e0 [ 33.930626] [] ? rw_verify_area+0x100/0x2f0 [ 33.936565] [] vfs_read+0x123/0x3a0 [ 33.941809] [] SyS_read+0xd9/0x1b0 [ 33.946974] [] ? do_sendfile+0xd30/0xd30 [ 33.952653] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 33.959125] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 33.965669] [ 33.967266] Allocated by task 0: [ 33.970596] (stack is not available) [ 33.974281] [ 33.975882] Freed by task 0: [ 33.978868] (stack is not available) [ 33.982545] [ 33.984141] The buggy address belongs to the object at ffff8801cbbda100 [ 33.984141] which belongs to the cache fasync_cache of size 96 [ 33.996771] The buggy address is located 64 bytes inside of [ 33.996771] 96-byte region [ffff8801cbbda100, ffff8801cbbda160) [ 34.008437] 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 2857830728 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 [ 1.225810] Calibrating delay loop (skipped) preset value.. 4600.00 BogoMIPS (lpj=23000000) [ 1.227013] pid_max: default: 32768 minimum: 301 [ 1.227731] ACPI: Core revision 20150930 [ 1.646193] ACPI: 2 ACPI AML tables successfully acquired and loaded [ 1.648135] Security Framework initialized [ 1.648755] SELinux: Initializing. [ 1.649415] AppArmor: AppArmor disabled by boot time parameter [ 1.650335] Mount-cache hash table entries: 16384 (order: 5, 131072 bytes) [ 1.651276] Mountpoint-cache hash table entries: 16384 (order: 5, 131072 bytes) [ 1.654966] Initializing cgroup subsys io [ 1.655641] Initializing cgroup subsys freezer [ 1.656328] Initializing cgroup subsys hugetlb [ 1.656975] Initializing cgroup subsys debug [ 1.657743] CPU: Physical Processor ID: 0 [ 1.659702] mce: CPU supports 32 MCE banks [ 1.660448] Last level iTLB entries: 4KB 1024, 2MB 1024, 4MB 1024 [ 1.661276] Last level dTLB entries: 4KB 1024, 2MB 1024, 4MB 1024, 1GB 4 [ 1.662226] Spectre V2 : Vulnerable: Minimal generic ASM retpoline [ 1.665395] Freeing SMP alternatives memory: 44K [ 1.675350] ..TIMER: vector=0x30 apic1=0 pin1=0 apic2=-1 pin2=-1 [ 1.795196] smpboot: CPU0: Intel(R) Xeon(R) CPU @ 2.30GHz (family: 0x6, model: 0x3f, stepping: 0x0) [ 1.797973] Performance Events: unsupported p6 CPU model 63 no PMU driver, software events only. [ 1.885465] x86: Booting SMP configuration: [ 1.886117] .... node #0, CPUs: #1 [ 1.886893] kvm-clock: cpu 1, msr 2:1fffd041, secondary cpu clock [ 1.891634] x86: Booted up 1 node, 2 CPUs [ 1.892199] smpboot: Total of 2 processors activated (9200.00 BogoMIPS) [ 1.897096] devtmpfs: initialized [ 1.906509] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns [ 1.907869] futex hash table entries: 512 (order: 4, 65536 bytes) [ 1.909492] xor: automatically using best checksumming function: [ 1.922474] kworker/u4:0 (21) used greatest stack depth: 27944 bytes left [ 2.005237] avx : 21476.400 MB/sec [ 2.006261] RTC time: 18:08:40, date: 03/23/18 [ 2.008502] NET: Registered protocol family 16 [ 2.009579] schedtune: init normalization constants... [ 2.010282] schedtune: no energy model data [ 2.010858] schedtune: disabled! [ 2.035520] cpuidle: using governor ladder [ 2.065300] cpuidle: using governor menu [ 2.066641] ACPI: bus type PCI registered [ 2.067282] acpiphp: ACPI Hot Plug PCI Controller Driver version: 0.5 [ 2.069697] PCI: Using configuration type 1 for base access [ 2.079670] kworker/u4:0 (48) used greatest stack depth: 27448 bytes left [ 2.189233] kworker/u4:3 (395) used greatest stack depth: 27080 bytes left [ 2.415236] raid6: sse2x1 gen() 4693 MB/s [ 2.585239] raid6: sse2x1 xor() 2605 MB/s [ 2.755234] raid6: sse2x2 gen() 7358 MB/s [ 2.925242] raid6: sse2x2 xor() 4282 MB/s [ 3.095239] raid6: sse2x4 gen() 9877 MB/s [ 3.265234] raid6: sse2x4 xor() 5690 MB/s [ 3.435256] raid6: avx2x1 gen() 9371 MB/s [ 3.605256] raid6: avx2x2 gen() 14561 MB/s [ 3.775244] raid6: avx2x4 gen() 19158 MB/s [ 3.775904] raid6: using algorithm avx2x4 gen() 19158 MB/s [ 3.776718] raid6: using avx2x2 recovery algorithm [ 3.778025] ACPI: Added _OSI(Module Device) [ 3.778690] ACPI: Added _OSI(Processor Device) [ 3.779338] ACPI: Added _OSI(3.0 _SCP Extensions) [ 3.779996] ACPI: Added _OSI(Processor Aggregator Device) [ 3.805729] ACPI: Executed 2 blocks of module-level executable AML code [ 4.644118] ACPI: Interpreter enabled [ 4.645044] ACPI: (supports S0 S3 S4 S5) [ 4.645625] ACPI: Using IOAPIC for interrupt routing [ 4.646745] PCI: Using host bridge windows from ACPI; if necessary, use "pci=nocrs" and report a bug [ 5.778886] ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-ff]) [ 5.779903] acpi PNP0A03:00: _OSC: OS supports [ASPM ClockPM Segments MSI] [ 5.781249] acpi PNP0A03:00: _OSC failed (AE_NOT_FOUND); disabling ASPM [ 5.782276] acpi PNP0A03:00: fail to add MMCONFIG information, can't access extended PCI configuration space under this bridge. [ 5.807719] PCI host bridge to bus 0000:00 [ 5.808406] pci_bus 0000:00: root bus resource [io 0x0000-0x0cf7 window] [ 5.809358] pci_bus 0000:00: root bus resource [io 0x0d00-0xffff window] [ 5.810286] pci_bus 0000:00: root bus resource [mem 0x000a0000-0x000bffff window] [ 5.811304] pci_bus 0000:00: root bus resource [mem 0xc0000000-0xfebfffff window] [ 5.812375] pci_bus 0000:00: root bus resource [bus 00-ff] [ 5.850156] pci 0000:00:01.3: quirk: [io 0xb000-0xb03f] claimed by PIIX4 ACPI [ 5.934098] ACPI: PCI Interrupt Link [LNKA] (IRQs 5 *10 11) [ 5.940193] ACPI: PCI Interrupt Link [LNKB] (IRQs 5 *10 11) [ 5.946007] ACPI: PCI Interrupt Link [LNKC] (IRQs 5 10 *11) [ 5.951922] ACPI: PCI Interrupt Link [LNKD] (IRQs 5 10 *11) [ 5.955727] ACPI: PCI Interrupt Link [LNKS] (IRQs *9)