[....] 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: [ 25.676581] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 25.983932] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 27.005913] random: sshd: uninitialized urandom read (32 bytes read, 123 bits of entropy available) [ 27.180414] random: sshd: uninitialized urandom read (32 bytes read, 127 bits of entropy available) [ 27.282361] random: nonblocking pool is initialized Warning: Permanently added '10.128.15.203' (ECDSA) to the list of known hosts. executing program [ 32.684052] ================================================================== [ 32.691457] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 32.698443] Read of size 8 at addr ffff8801da21a140 by task syzkaller730922/3988 [ 32.705943] [ 32.707556] CPU: 0 PID: 3988 Comm: syzkaller730922 Not tainted 4.4.113-g962d1f3 #2 [ 32.715231] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.724557] 0000000000000000 cc5ba4d7e286d825 ffff8800b950f9f0 ffffffff81d028ed [ 32.732534] ffffea0007688680 ffff8801da21a140 0000000000000000 ffff8801da21a140 [ 32.740532] ffff8800ba6f2338 ffff8800b950fa28 ffffffff814fd1c3 ffff8801da21a140 [ 32.748513] Call Trace: [ 32.751080] [] dump_stack+0xc1/0x124 [ 32.756418] [] print_address_description+0x73/0x260 [ 32.763059] [] kasan_report+0x285/0x370 [ 32.768656] [] ? sg_remove_request+0xf9/0x110 [ 32.774770] [] __asan_report_load8_noabort+0x14/0x20 [ 32.781496] [] sg_remove_request+0xf9/0x110 [ 32.787439] [] sg_finish_rem_req+0x295/0x340 [ 32.793475] [] sg_read+0xa1b/0x1490 [ 32.798723] [] ? __check_object_size+0x154/0x35b [ 32.805102] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 32.811750] [] ? fsnotify+0xee0/0xee0 [ 32.817175] [] ? avc_policy_seqno+0x9/0x20 [ 32.823034] [] do_loop_readv_writev+0x141/0x1e0 [ 32.829326] [] ? security_file_permission+0x89/0x1e0 [ 32.836049] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 32.842684] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 32.849342] [] do_readv_writev+0x5dd/0x6e0 [ 32.855197] [] ? vfs_write+0x530/0x530 [ 32.860703] [] ? _raw_spin_unlock+0x2c/0x50 [ 32.866644] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 32.873630] [] ? handle_mm_fault+0x3f2/0x3190 [ 32.879766] [] ? sg_fasync+0x8d/0xb0 [ 32.885101] [] vfs_readv+0x78/0xb0 [ 32.890263] [] SyS_readv+0xd9/0x240 [ 32.895519] [] ? rw_copy_check_uvector+0x2b0/0x2b0 [ 32.902069] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 32.908618] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 32.915174] [ 32.916774] Allocated by task 0: [ 32.920105] (stack is not available) [ 32.923783] [ 32.925385] Freed by task 0: [ 32.928372] (stack is not available) [ 32.932050] [ 32.933646] The buggy address belongs to the object at ffff8801da21a100 [ 32.933646] which belongs to the cache fasync_cache of size 96 [ 32.946269] The buggy address is located 64 bytes inside of [ 32.946269] 96-byte region [ffff8801da21a100, ffff8801da21a160) [ 32.957936] The buggy address belongs to the page: [ 32.973313] kasan: CONFIG_KASAN_INLINE enabled [ 32.977769] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 32.990672] BUG: unable to handle kernel paging request at ffffffff847ed170 [ 32.998010] IP: [] trace_init_global_iter+0xde/0x2c0 [ 33.004801] PGD 420f067 PUD 4210063 PMD b65d6063 PTE ffffea0007688680 [ 33.011886] Oops: 0000 [#2] PREEMPT SMP KASAN [ 33.016875] Modules linked in: [ 33.020185] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.4.113-g962d1f3 #2 [ 33.027098] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.036450] task: ffff8801d9b497c0 task.stack: ffff8801d9b58000 [ 33.042500] RIP: 0010:[] [] trace_init_global_iter+0xde/0x2c0 [ 33.051741] RSP: 0018:ffff8801db307b50 EFLAGS: 00010046 [ 33.057183] RAX: dffffc0000000000 RBX: ffffffff8572bd40 RCX: ffffffff8139ef4f [ 33.064451] RDX: 1ffffffff08fda2e RSI: 0000000000000001 RDI: ffffffff847ed170 [ 33.071725] RBP: ffff8801db307b70 R08: 0000000000000000 R09: 0000000000000001 [ 33.078992] R10: ffffffff83844340 R11: 1ffff1003b660f54 R12: ffffffff842e5e98 [ 33.086262] R13: ffffffff847ed140 R14: ffffffff8572bd50 R15: 1ffffffff08fd984 [ 33.093532] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 33.101767] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.107649] CR2: ffffffff847ed170 CR3: 00000000ba24e000 CR4: 0000000000160670 [ 33.114922] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 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: 0x00000000039cb26e input_len: 0x0000000001424688 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 16:51:40 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 1682222532 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 [ 1.157976] Calibrating delay loop (skipped) preset value.. 4600.00 BogoMIPS (lpj=23000000) [ 1.159138] pid_max: default: 32768 minimum: 301 [ 1.159854] ACPI: Core revision 20150930 [ 1.584828] ACPI: 2 ACPI AML tables successfully acquired and loaded [ 1.586792] Security Framework initialized [ 1.587411] SELinux: Initializing. [ 1.588068] AppArmor: AppArmor disabled by boot time parameter [ 1.588966] Mount-cache hash table entries: 16384 (order: 5, 131072 bytes) [ 1.589892] Mountpoint-cache hash table entries: 16384 (order: 5, 131072 bytes) [ 1.593564] Initializing cgroup subsys io [ 1.594161] Initializing cgroup subsys freezer [ 1.594808] Initializing cgroup subsys hugetlb [ 1.595453] Initializing cgroup subsys debug [ 1.596271] CPU: Physical Processor ID: 0 [ 1.598216] mce: CPU supports 32 MCE banks [ 1.598965] Last level iTLB entries: 4KB 1024, 2MB 1024, 4MB 1024 [ 1.599795] Last level dTLB entries: 4KB 1024, 2MB 1024, 4MB 1024, 1GB 4 [ 1.600698] Spectre V2 mitigation: Vulnerable: Minimal generic ASM retpoline [ 1.603946] Freeing SMP alternatives memory: 44K [ 1.613443] ..TIMER: vector=0x30 apic1=0 pin1=0 apic2=-1 pin2=-1 [ 1.727207] smpboot: CPU0: Intel(R) Xeon(R) CPU @ 2.30GHz (family: 0x6, model: 0x3f, stepping: 0x0) [ 1.728685] Performance Events: unsupported p6 CPU model 63 no PMU driver, software events only. [ 1.817443] x86: Booting SMP configuration: [ 1.818097] .... node #0, CPUs: #1 [ 1.818892] kvm-clock: cpu 1, msr 2:1fffd041, secondary cpu clock [ 1.823664] x86: Booted up 1 node, 2 CPUs [ 1.824249] smpboot: Total of 2 processors activated (9200.00 BogoMIPS) [ 1.828857] devtmpfs: initialized [ 1.838440] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns [ 1.839809] futex hash table entries: 512 (order: 4, 65536 bytes) [ 1.841453] xor: automatically using best checksumming function: [ 1.854901] kworker/u4:0 (21) used greatest stack depth: 28008 bytes left [ 1.937225] avx : 21533.200 MB/sec [ 1.938450] RTC time: 9:23:38, date: 01/31/18 [ 1.940790] NET: Registered protocol family 16 [ 1.941875] schedtune: init normalization constants... [ 1.942578] schedtune: no energy model data [ 1.943173] schedtune: disabled! [ 1.977418] cpuidle: using governor ladder [ 2.007256] cpuidle: using governor menu [ 2.008555] ACPI: bus type PCI registered [ 2.009129] acpiphp: ACPI Hot Plug PCI Controller Driver version: 0.5 [ 2.011974] PCI: Using configuration type 1 for base access [ 2.020585] kworker/u4:0 (44) used greatest stack depth: 27512 bytes left [ 2.457233] raid6: sse2x1 gen() 4625 MB/s [ 2.627202] raid6: sse2x1 xor() 2508 MB/s [ 2.797196] raid6: sse2x2 gen() 7207 MB/s [ 2.967181] raid6: sse2x2 xor() 4281 MB/s [ 3.137170] raid6: sse2x4 gen() 9691 MB/s [ 3.307162] raid6: sse2x4 xor() 5605 MB/s [ 3.477161] raid6: avx2x1 gen() 9273 MB/s [ 3.647146] raid6: avx2x2 gen() 14172 MB/s [ 3.817140] raid6: avx2x4 gen() 18714 MB/s [ 3.817819] raid6: using algorithm avx2x4 gen() 18714 MB/s [ 3.818590] raid6: using avx2x2 recovery algorithm [ 3.819913] ACPI: Added _OSI(Module Device) [ 3.820589] ACPI: Added _OSI(Processor Device) [ 3.821218] ACPI: Added _OSI(3.0 _SCP Extensions) [ 3.821860] ACPI: Added _OSI(Processor Aggregator Device) [ 3.847931] ACPI: Executed 2 blocks of module-level executable AML code [ 4.747244] ACPI: Interpreter enabled [ 4.748298] ACPI: (supports S0 S3 S4 S5) [ 4.748855] ACPI: Using IOAPIC for interrupt routing [ 4.749982] PCI: Using host bridge windows from ACPI; if necessary, use "pci=nocrs" and report a bug [ 5.928348] ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-ff]) [ 5.929367] acpi PNP0A03:00: _OSC: OS supports [ASPM ClockPM Segments MSI] [ 5.930685] acpi PNP0A03:00: _OSC failed (AE_NOT_FOUND); disabling ASPM [ 5.931669] acpi PNP0A03:00: fail to add MMCONFIG information, can't access extended PCI configuration space under this bridge. [ 5.959001] PCI host bridge to bus 0000:00 [ 5.959631] pci_bus 0000:00: root bus resource [io 0x0000-0x0cf7 window] [ 5.960564] pci_bus 0000:00: root bus resource [io 0x0d00-0xffff window] [ 5.961497] pci_bus 0000:00: root bus resource [mem 0x000a0000-0x000bffff window] [ 5.962515] pci_bus 0000:00: root bus resource [mem 0xc0000000-0xfebfffff window] [ 5.963542] pci_bus 0000:00: root bus resource [bus 00-ff]