[ 22.393973] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.046377] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 26.545645] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 27.557620] random: sshd: uninitialized urandom read (32 bytes read, 123 bits of entropy available) [ 27.725042] random: nonblocking pool is initialized Warning: Permanently added '10.128.0.11' (ECDSA) to the list of known hosts. executing program [ 33.214268] ================================================================== [ 33.221664] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 33.228644] Read of size 8 at addr ffff8800ba2a5140 by task syzkaller256569/3986 [ 33.236142] [ 33.237740] CPU: 0 PID: 3986 Comm: syzkaller256569 Not tainted 4.4.114-gfe09418 #3 [ 33.245410] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.254746] 0000000000000000 b8dd761c005d4764 ffff8800ba067ab0 ffffffff81d02e6d [ 33.262729] ffffea0002e8a940 ffff8800ba2a5140 0000000000000000 ffff8800ba2a5140 [ 33.270691] ffff8800ba730238 ffff8800ba067ae8 ffffffff814fd6f3 ffff8800ba2a5140 [ 33.278650] Call Trace: [ 33.281210] [] dump_stack+0xc1/0x124 [ 33.286552] [] print_address_description+0x73/0x260 [ 33.293188] [] kasan_report+0x285/0x370 [ 33.298791] [] ? sg_remove_request+0xf9/0x110 [ 33.304903] [] __asan_report_load8_noabort+0x14/0x20 [ 33.311630] [] sg_remove_request+0xf9/0x110 [ 33.317572] [] sg_finish_rem_req+0x295/0x340 [ 33.323596] [] sg_read+0xa1b/0x1490 [ 33.328841] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 33.335475] [] ? new_slab+0x2df/0x3b0 [ 33.340895] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 33.347546] [] __vfs_read+0x103/0x440 [ 33.352968] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 33.359949] [] ? vfs_iter_write+0x2d0/0x2d0 [ 33.365889] [] ? fsnotify+0x5ad/0xee0 [ 33.371393] [] ? fsnotify+0xee0/0xee0 [ 33.376811] [] ? lockdep_init_map+0xeb/0x1690 [ 33.382937] [] ? avc_policy_seqno+0x9/0x20 [ 33.388791] [] ? selinux_file_permission+0x348/0x460 [ 33.395509] [] ? security_file_permission+0x89/0x1e0 [ 33.402252] [] ? rw_verify_area+0x100/0x2f0 [ 33.408190] [] vfs_read+0x123/0x3a0 [ 33.413436] [] SyS_read+0xd9/0x1b0 [ 33.418591] [] ? do_sendfile+0xd30/0xd30 [ 33.424271] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 33.430737] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 33.437281] [ 33.438877] Allocated by task 0: [ 33.442208] (stack is not available) [ 33.445883] [ 33.447479] Freed by task 0: [ 33.450461] (stack is not available) [ 33.454136] [ 33.455732] The buggy address belongs to the object at ffff8800ba2a5100 [ 33.455732] which belongs to the cache fasync_cache of size 96 [ 33.468351] The buggy address is located 64 bytes inside of [ 33.468351] 96-byte region [ffff8800ba2a5100, ffff8800ba2a5160) [ 33.480105] The buggy address belongs to the page: [ 33.498006] kasan: CONFIG_KASAN_INLINE enabled [ 33.502448] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 33.515368] Dumping ftrace buffer: [ 33.518892] (ftrace buffer empty) [ 33.522586] Modules linked in: [ 33.525891] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.4.114-gfe09418 #3 [ 33.532795] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.542133] task: ffff8801d9b497c0 task.stack: ffff8801d9b58000 [ 33.548175] RIP: 0010:[] [] irq_may_run+0x45/0x100 [ 33.556449] RSP: 0018:ffff8801db307e80 EFLAGS: 00010046 [ 33.561895] RAX: dffffc0000000000 RBX: ffff8800b77c6500 RCX: ffffffff81276961 [ 33.569159] RDX: 0000000000000000 RSI: ffffffff85133b70 RDI: ffff8800b77c6530 [ 33.576418] RBP: ffff8801db307e98 R08: 0000000000000001 R09: ffffffff85133b70 [ 33.583680] R10: 0000000000000000 R11: 1ffff1003b660f9c R12: 0000000000000000 [ 33.590946] R13: ffff8801d9b5fd80 R14: ffff8801d9b58000 R15: 0000000000000000 [ 33.598219] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 33.606554] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.612428] CR2: 000056020f5ed110 CR3: 00000000badd8000 CR4: 0000000000160670 SeaBIOS (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: 0x00000000039ca26e input_len: 0x000000000142553f 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 4.4.114-gfe09418 (syzkaller@ci) (gcc version 7.1.1 20170620 (GCC) ) #3 SMP PREEMPT Wed Jan 31 14:46:20 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 2289920910 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 (40420K kernel code, 6135K rwdata, 8816K 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 [ 1.164739] Calibrating delay loop (skipped) preset value.. 4600.00 BogoMIPS (lpj=23000000) [ 1.165931] pid_max: default: 32768 minimum: 301 [ 1.166685] ACPI: Core revision 20150930 [ 1.580325] ACPI: 2 ACPI AML tables successfully acquired and loaded [ 1.582320] Security Framework initialized [ 1.582908] SELinux: Initializing. [ 1.583564] AppArmor: AppArmor disabled by boot time parameter [ 1.584524] Mount-cache hash table entries: 16384 (order: 5, 131072 bytes) [ 1.585466] Mountpoint-cache hash table entries: 16384 (order: 5, 131072 bytes) [ 1.589170] Initializing cgroup subsys io [ 1.589779] Initializing cgroup subsys freezer [ 1.590423] Initializing cgroup subsys hugetlb [ 1.591047] Initializing cgroup subsys debug [ 1.591828] CPU: Physical Processor ID: 0 [ 1.593671] mce: CPU supports 32 MCE banks [ 1.594506] Last level iTLB entries: 4KB 1024, 2MB 1024, 4MB 1024 [ 1.595357] Last level dTLB entries: 4KB 1024, 2MB 1024, 4MB 1024, 1GB 4 [ 1.596278] Spectre V2 mitigation: Vulnerable: Minimal generic ASM retpoline [ 1.599528] Freeing SMP alternatives memory: 44K [ 1.608676] ..TIMER: vector=0x30 apic1=0 pin1=0 apic2=-1 pin2=-1 [ 1.724026] smpboot: CPU0: Intel(R) Xeon(R) CPU @ 2.30GHz (family: 0x6, model: 0x3f, stepping: 0x0) [ 1.725500] Performance Events: unsupported p6 CPU model 63 no PMU driver, software events only. [ 1.814274] x86: Booting SMP configuration: [ 1.814968] .... node #0, CPUs: #1 [ 1.815729] kvm-clock: cpu 1, msr 2:1fffd041, secondary cpu clock [ 1.820533] x86: Booted up 1 node, 2 CPUs [ 1.821142] smpboot: Total of 2 processors activated (9200.00 BogoMIPS) [ 1.825810] devtmpfs: initialized [ 1.835976] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns [ 1.837369] futex hash table entries: 512 (order: 4, 65536 bytes) [ 1.839003] xor: automatically using best checksumming function: [ 1.851640] kworker/u4:0 (21) used greatest stack depth: 28008 bytes left [ 1.934030] avx : 21064.000 MB/sec [ 1.935212] RTC time: 15:21:11, date: 02/01/18 [ 1.937584] NET: Registered protocol family 16 [ 1.938726] schedtune: init normalization constants... [ 1.939452] schedtune: no energy model data [ 1.940058] schedtune: disabled! [ 1.974251] cpuidle: using governor ladder [ 2.004081] cpuidle: using governor menu [ 2.005496] ACPI: bus type PCI registered [ 2.006123] acpiphp: ACPI Hot Plug PCI Controller Driver version: 0.5 [ 2.008963] PCI: Using configuration type 1 for base access [ 2.017338] kworker/u4:0 (47) used greatest stack depth: 27512 bytes left [ 2.131988] kworker/u4:0 (266) used greatest stack depth: 27144 bytes left [ 2.453983] raid6: sse2x1 gen() 4657 MB/s [ 2.623973] raid6: sse2x1 xor() 2394 MB/s [ 2.793967] raid6: sse2x2 gen() 6947 MB/s [ 2.963938] raid6: sse2x2 xor() 4233 MB/s [ 3.133948] raid6: sse2x4 gen() 9476 MB/s [ 3.303901] raid6: sse2x4 xor() 5618 MB/s [ 3.473883] raid6: avx2x1 gen() 8939 MB/s [ 3.643869] raid6: avx2x2 gen() 13997 MB/s [ 3.813854] raid6: avx2x4 gen() 18301 MB/s [ 3.814508] raid6: using algorithm avx2x4 gen() 18301 MB/s [ 3.815332] raid6: using avx2x2 recovery algorithm [ 3.816644] ACPI: Added _OSI(Module Device) [ 3.817292] ACPI: Added _OSI(Processor Device) [ 3.817904] ACPI: Added _OSI(3.0 _SCP Extensions) [ 3.818562] ACPI: Added _OSI(Processor Aggregator Device) [ 3.845312] ACPI: Executed 2 blocks of module-level executable AML code [ 4.717708] ACPI: Interpreter enabled [ 4.718681] ACPI: (supports S0 S3 S4 S5) [ 4.719229] ACPI: Using IOAPIC for interrupt routing [ 4.721284] PCI: Using host bridge windows from ACPI; if necessary, use "pci=nocrs" and report a bug