ooting the kernel. [ 0.000000] Linux version 4.17.0-rc6+ (syzkaller@ci) (gcc version 8.0.1 20180413 (experimental) (GCC)) #36 SMP Tue Jun 5 21:07:24 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 kvm-intel.nested=1 nf-conntrack-ftp.ports=20000 nf-conntrack-tftp.ports=20000 nf-conntrack-sip.ports=20000 nf-conntrack-irc.ports=20000 nf-conntrack-sane.ports=20000 nopcid [ 0.000000] x86/fpu: Supporting XSAVE feature 0x001: 'x87 floating point registers' [ 0.000000] x86/fpu: Supporting XSAVE feature 0x002: 'SSE registers' [ 0.000000] x86/fpu: Supporting XSAVE feature 0x004: 'AVX registers' [ 0.000000] x86/fpu: xstate_offset[2]: 576, xstate_sizes[2]: 256 [ 0.000000] x86/fpu: Enabled xstate features 0x7, context size is 832 bytes, using 'standard' format. [ 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] Malformed early option 'vsyscall' [ 0.000000] nopcid: PCID feature disabled [ 0.000000] NX (Execute Disable) protection: active [ 0.000000] SMBIOS 2.4 present. [ 0.000000] DMI: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 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 WP UC- WT [ 0.000000] e820: last_pfn = 0xbfff3 max_arch_pfn = 0x400000000 [ 0.000000] found SMP MP-table at [mem 0x000f22b0-0x000f22bf] mapped at [ (ptrval)] [ 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 0x00000000000F2270 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] SRAT: PXM 0 -> APIC 0x00 -> Node 0 [ 0.000000] SRAT: PXM 0 -> APIC 0x01 -> Node 0 [ 0.000000] ACPI: SRAT: Node 0 PXM 0 [mem 0x00000000-0x0009ffff] [ 0.000000] ACPI: SRAT: Node 0 PXM 0 [mem 0x00100000-0xbfffffff] [ 0.000000] ACPI: SRAT: Node 0 PXM 0 [mem 0x100000000-0x21fffffff] [ 0.000000] NUMA: Node 0 [mem 0x00000000-0x0009ffff] + [mem 0x00100000-0xbfffffff] -> [mem 0x00000000-0xbfffffff] [ 0.000000] NUMA: Node 0 [mem 0x00000000-0xbfffffff] + [mem 0x100000000-0x21fffffff] -> [mem 0x00000000-0x21fffffff] [ 0.000000] NODE_DATA(0) allocated [mem 0x21fffa000-0x21fffdfff] [ 0.000000] kvm-clock: cpu 0, msr 2:1fff8001, primary cpu clock [ 0.000000] kvm-clock: Using msrs 4b564d01 and 4b564d00 [ 0.000000] kvm-clock: using sched offset of 4466296237 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] Reserved but unavailable: 98 pages [ 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: 1910969940391419 ns [ 0.000000] random: get_random_bytes called from start_kernel+0x10a/0x92d with crng_init=0 [ 0.000000] setup_percpu: NR_CPUS:64 nr_cpumask_bits:64 nr_cpu_ids:2 nr_node_ids:1 [ 0.000000] percpu: Embedded 55 pages/cpu @ (ptrval) s187784 r8192 d29304 u1048576 [ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 1935228 [ 0.000000] Policy zone: Normal [ 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 kvm-intel.nested=1 nf-conntrack-ftp.ports=20000 nf-conntrack-tftp.ports=20000 nf-conntrack-sip.ports=20000 nf-conntrack-irc.ports=20000 nf-conntrack-sane.ports=20000 nopcid [ 0.000000] Memory: 6503504K/7863876K available (108576K kernel code, 12158K rwdata, 15876K rodata, 2896K init, 23132K bss, 1360372K reserved, 0K cma-reserved) [ 0.001000] Running RCU self tests [ 0.001000] Hierarchical RCU implementation. [ 0.001000] RCU lockdep checking is enabled. [ 0.001000] RCU restricting CPUs from NR_CPUS=64 to nr_cpu_ids=2. [ 0.001000] RCU callback double-/use-after-free debug enabled. [ 0.001000] RCU: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=2 [ 0.001000] NR_IRQS: 4352, nr_irqs: 440, preallocated irqs: 16 [ 0.001000] Console: colour VGA+ 80x25 [ 0.001000] console [ttyS0] enabled [ 0.001000] console [ttyS0] enabled [ 0.001000] bootconsole [earlyser0] disabled [ 0.001000] bootconsole [earlyser0] disabled [ 0.001000] Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar [ 0.001000] ... MAX_LOCKDEP_SUBCLASSES: 8 [ 0.001000] ... MAX_LOCK_DEPTH: 48 [ 0.001000] ... MAX_LOCKDEP_KEYS: 8191 [ 0.001000] ... CLASSHASH_SIZE: 4096 [ 0.001000] ... MAX_LOCKDEP_ENTRIES: 32768 [ 0.001000] ... MAX_LOCKDEP_CHAINS: 65536 [ 0.001000] ... CHAINHASH_SIZE: 32768 [ 0.001000] memory used by lock dependency info: 7391 kB [ 0.001000] per task-struct memory footprint: 1920 bytes [ 0.001000] ACPI: Core revision 20180313 [ 0.001031] APIC: Switch to symmetric I/O mode setup [ 0.002446] x2apic enabled [ 0.003013] Switched APIC routing to physical x2apic. [ 0.007829] ..TIMER: vector=0x30 apic1=0 pin1=0 apic2=-1 pin2=-1 [ 0.008000] tsc: Detected 2300.000 MHz processor [ 0.008039] clocksource: tsc-early: mask: 0xffffffffffffffff max_cycles: 0x212735223b2, max_idle_ns: 440795277976 ns [ 0.009030] Calibrating delay loop (skipped) preset value.. 4600.00 BogoMIPS (lpj=2300000) [ 0.011009] pid_max: default: 32768 minimum: 301 [ 0.012282] Security Framework initialized [ 0.012861] Yama: becoming mindful. [ 0.013055] SELinux: Initializing. [ 0.014319] AppArmor: AppArmor disabled by boot time parameter [ 0.020305] Dentry cache hash table entries: 1048576 (order: 11, 8388608 bytes) [ 0.023465] Inode-cache hash table entries: 524288 (order: 10, 4194304 bytes) [ 0.025039] Mount-cache hash table entries: 16384 (order: 5, 131072 bytes) [ 0.026744] Mountpoint-cache hash table entries: 16384 (order: 5, 131072 bytes) [ 0.029542] CPU: Physical Processor ID: 0 [ 0.030060] mce: CPU supports 32 MCE banks [ 0.030789] Last level iTLB entries: 4KB 1024, 2MB 1024, 4MB 1024 [ 0.031010] Last level dTLB entries: 4KB 1024, 2MB 1024, 4MB 1024, 1GB 4 [ 0.032026] Spectre V2 : Mitigation: Full generic retpoline [ 0.033007] Speculative Store Bypass: Vulnerable [ 0.034742] Freeing SMP alternatives memory: 64K [ 0.038000] smpboot: CPU0: Intel(R) Xeon(R) CPU @ 2.30GHz (family: 0x6, model: 0x3f, stepping: 0x0) [ 0.039174] Performance Events: unsupported p6 CPU model 63 no PMU driver, software events only. [ 0.040230] Hierarchical SRCU implementation. [ 0.042017] NMI watchdog: Perf event create on CPU 0 failed with -2 [ 0.042873] NMI watchdog: Perf NMI watchdog permanently disabled [ 0.044144] smp: Bringing up secondary CPUs ... [ 0.046475] x86: Booting SMP configuration: [ 0.047012] .... node #0, CPUs: #1 [ 0.001000] kvm-clock: cpu 1, msr 2:1fff8041, secondary cpu clock [ 0.050393] smp: Brought up 1 node, 2 CPUs [ 0.051039] smpboot: Max logical packages: 1 [ 0.051668] smpboot: Total of 2 processors activated (9200.00 BogoMIPS) [ 0.055183] devtmpfs: initialized [ 0.066000] kworker/u4:0 (23) used greatest stack depth: 23056 bytes left [ 0.068062] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 1911260446275000 ns [ 0.069066] futex hash table entries: 512 (order: 4, 65536 bytes) [ 0.071048] xor: automatically using best checksumming function avx [ 0.072454] RTC time: 21:19:22, date: 06/05/18 [ 0.081661] NET: Registered protocol family 16 [ 0.084713] audit: initializing netlink subsys (disabled) [ 0.085095] audit: type=2000 audit(1528233562.597:1): state=initialized audit_enabled=0 res=1 [ 0.087371] cpuidle: using governor menu [ 0.089969] ACPI: bus type PCI registered [ 0.092232] PCI: Using configuration type 1 for base access [ 0.165951] kworker/u4:1 (286) used greatest stack depth: 22808 bytes left [ 0.320544] kworker/u4:2 (740) used greatest stack depth: 20952 bytes left [ 0.366497] HugeTLB registered 2.00 MiB page size, pre-allocated 0 pages [ 0.369219] cryptd: max_cpu_qlen set to 1000 [ 0.387651] raid6: sse2x1 gen() 871 MB/s [ 0.404654] raid6: sse2x1 xor() 1009 MB/s [ 0.421643] raid6: sse2x2 gen() 3859 MB/s [ 0.438631] raid6: sse2x2 xor() 1945 MB/s [ 0.455639] raid6: sse2x4 gen() 6031 MB/s [ 0.472635] raid6: sse2x4 xor() 3285 MB/s [ 0.489645] raid6: avx2x1 gen() 4179 MB/s [ 0.506683] raid6: avx2x1 xor() 2031 MB/s [ 0.523640] raid6: avx2x2 gen() 7460 MB/s [ 0.540634] raid6: avx2x2 xor() 3587 MB/s [ 0.557637] raid6: avx2x4 gen() 11750 MB/s [ 0.574634] raid6: avx2x4 xor() 6388 MB/s [ 0.575012] raid6: using algorithm avx2x4 gen() 11750 MB/s [ 0.576009] raid6: .... xor() 6388 MB/s, rmw enabled [ 0.577010] raid6: using avx2x2 recovery algorithm [ 0.579014] ACPI: Added _OSI(Module Device) [ 0.579017] ACPI: Added _OSI(Processor Device) [ 0.580011] ACPI: Added _OSI(3.0 _SCP Extensions) [ 0.580692] ACPI: Added _OSI(Processor Aggregator Device) [ 0.582021] ACPI: Added _OSI(Linux-Dell-Video) [ 0.771912] ACPI: 2 ACPI AML tables successfully acquired and loaded [ 1.261384] ACPI: Interpreter enabled [ 1.262214] ACPI: (supports S0 S3 S4 S5) [ 1.262769] ACPI: Using IOAPIC for interrupt routing [ 1.264004] PCI: Using host bridge windows from ACPI; if necessary, use "pci=nocrs" and report a bug [ 1.266931] ACPI: Enabled 16 GPEs in block 00 to 0F [ 1.867680] ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-ff]) [ 1.868069] acpi PNP0A03:00: _OSC: OS supports [ASPM ClockPM Segments MSI] [ 1.871235] acpi PNP0A03:00: _OSC failed (AE_NOT_FOUND); disabling ASPM [ 1.872032] acpi PNP0A03:00: fail to add MMCONFIG information, can't access extended PCI configuration space under this bridge. [ 1.877222] PCI host bridge to bus 0000:00 [ 1.877983] pci_bus 0000:00: root bus resource [io 0x0000-0x0cf7 window] [ 1.879021] pci_bus 0000:00: root bus resource [io 0x0d00-0xffff window] [ 1.879949] pci_bus 0000:00: root bus resource [mem 0x000a0000-0x000bffff window] [ 1.881020] pci_bus 0000:00: root bus resource [mem 0xc0000000-0xfebfffff window] [ 1.882021] pci_bus 0000:00: root bus resource [bus 00-ff] [ 1.916179] pci 0000:00:01.3: quirk: [io 0xb000-0xb03f] claimed by PIIX4 ACPI [ 1.971278] ACPI: PCI Interrupt Link [LNKA] (IRQs 5 *10 11) [ 1.975624] ACPI: PCI Interrupt Link [LNKB] (IRQs 5 *10 11) [ 1.979460] ACPI: PCI Interrupt Link [LNKC] (IRQs 5 10 *11) [ 1.982615] ACPI: PCI Interrupt Link [LNKD] (IRQs 5 10 *11) [ 1.984465] ACPI: PCI Interrupt Link [LNKS] (IRQs *9) [ 2.350965] vgaarb: loaded [ 2.353159] SCSI subsystem initialized [ 2.354725] ACPI: bus type USB registered [ 2.356443] usbcore: registered new interface driver usbfs [ 2.357413] usbcore: registered new interface driver hub [ 2.359199] usbcore: registered new device driver usb [ 2.362269] ================================================================== [ 2.363000] BUG: KASAN: use-after-free in call_usermodehelper_exec_work+0x2d3/0x310 [ 2.363000] Write of size 4 at addr ffff8801d6b6c670 by task kworker/u4:0/6 [ 2.363000] [ 2.363000] CPU: 0 PID: 6 Comm: kworker/u4:0 Not tainted 4.17.0-rc6+ #36 [ 2.363000] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 2.363000] Workqueue: events_unbound call_usermodehelper_exec_work [ 2.363000] Call Trace: [ 2.363000] dump_stack+0x1b9/0x294 [ 2.363000] ? dump_stack_print_info.cold.2+0x52/0x52 [ 2.363000] ? printk+0x9e/0xba [ 2.363000] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 2.363000] ? kasan_check_write+0x14/0x20 [ 2.363000] print_address_description+0x6c/0x20b [ 2.363000] ? call_usermodehelper_exec_work+0x2d3/0x310 [ 2.363000] kasan_report.cold.7+0x242/0x2fe [ 2.363000] __asan_report_store4_noabort+0x17/0x20 [ 2.363000] call_usermodehelper_exec_work+0x2d3/0x310 [ 2.363000] ? call_usermodehelper_exec_async+0x9e0/0x9e0 [ 2.363000] process_one_work+0xc1e/0x1b50 [ 2.363000] ? finish_task_switch+0x28b/0x840 [ 2.363000] ? pwq_dec_nr_in_flight+0x490/0x490 [ 2.363000] ? __schedule+0x809/0x1e30 [ 2.363000] ? graph_lock+0x170/0x170 [ 2.363000] ? lock_downgrade+0x8e0/0x8e0 [ 2.363000] ? find_held_lock+0x36/0x1c0 [ 2.363000] ? lock_acquire+0x1dc/0x520 [ 2.363000] ? worker_thread+0x41f/0x1440 [ 2.363000] ? lock_downgrade+0x8e0/0x8e0 [ 2.363000] ? lock_release+0xa10/0xa10 [ 2.363000] ? kasan_check_read+0x11/0x20 [ 2.363000] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 2.363000] worker_thread+0x1cc/0x1440 [ 2.363000] ? process_one_work+0x1b50/0x1b50 [ 2.363000] ? graph_lock+0x170/0x170 [ 2.363000] ? find_held_lock+0x36/0x1c0 [ 2.363000] ? find_held_lock+0x36/0x1c0 [ 2.363000] ? schedule+0xef/0x430 [ 2.363000] ? __schedule+0x1e30/0x1e30 [ 2.363000] ? do_raw_spin_unlock+0x9e/0x2e0 [ 2.363000] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 2.363000] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 2.363000] ? __kthread_parkme+0x111/0x1d0 [ 2.363000] ? parse_args.cold.15+0x1b3/0x1b3 [ 2.363000] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 2.363000] ? trace_hardirqs_on+0xd/0x10 [ 2.363000] kthread+0x345/0x410 [ 2.363000] ? process_one_work+0x1b50/0x1b50 [ 2.363000] ? kthread_bind+0x40/0x40 [ 2.363000] ret_from_fork+0x3a/0x50 [ 2.363000] [ 2.363000] Allocated by task 1: [ 2.363000] save_stack+0x43/0xd0 [ 2.363000] kasan_kmalloc+0xc4/0xe0 [ 2.363000] kmem_cache_alloc_trace+0x152/0x780 [ 2.363000] call_usermodehelper_setup+0xe8/0x400 [ 2.363000] kobject_uevent_env+0xb21/0x1110 [ 2.363000] kobject_uevent+0x1f/0x30 [ 2.363000] kset_register+0x4d/0x70 [ 2.363000] __class_register+0x282/0x520 [ 2.363000] __class_create+0xd1/0x140 [ 2.363000] pps_init+0x1f/0x106 [ 2.363000] do_one_initcall+0x127/0x913 [ 2.363000] kernel_init_freeable+0x49b/0x58e [ 2.363000] kernel_init+0x11/0x1b3 [ 2.363000] ret_from_fork+0x3a/0x50 [ 2.363000] [ 2.363000] Freed by task 1252: [ 2.363000] save_stack+0x43/0xd0 [ 2.363000] __kasan_slab_free+0x11a/0x170 [ 2.363000] kasan_slab_free+0xe/0x10 [ 2.363000] kfree+0xd9/0x260 [ 2.363000] umh_complete+0x7b/0x90 [ 2.363000] call_usermodehelper_exec_async+0x6e8/0x9e0 [ 2.363000] ret_from_fork+0x3a/0x50 [ 2.363000] [ 2.363000] The buggy address belongs to the object at ffff8801d6b6c600 [ 2.363000] which belongs to the cache kmalloc-192 of size 192 [ 2.363000] The buggy address is located 112 bytes inside of [ 2.363000] 192-byte region [ffff8801d6b6c600, ffff8801d6b6c6c0) [ 2.363000] The buggy address belongs to the page: [ 2.363000] page:ffffea00075adb00 count:1 mapcount:0 mapping:ffff8801d6b6c000 index:0x0 [ 2.363000] flags: 0x2fffc0000000100(slab) [ 2.363000] raw: 02fffc0000000100 ffff8801d6b6c000 0000000000000000 0000000100000010 [ 2.363000] raw: ffffea0007597be0 ffff8801da801148 ffff8801da800040 0000000000000000 [ 2.363000] page dumped because: kasan: bad access detected [ 2.363000] [ 2.363000] Memory state around the buggy address: [ 2.363000] ffff8801d6b6c500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 2.363000] ffff8801d6b6c580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 2.363000] >ffff8801d6b6c600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 2.363000] ^ [ 2.363000] ffff8801d6b6c680: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 2.363000] ffff8801d6b6c700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 2.363000] ================================================================== [ 2.363000] Disabling lock debugging due to kernel taint [ 2.363147] Kernel panic - not syncing: panic_on_warn set ... [ 2.363147] [ 2.364000] CPU: 0 PID: 6 Comm: kworker/u4:0 Tainted: G B 4.17.0-rc6+ #36 [ 2.364000] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 2.364000] Workqueue: events_unbound call_usermodehelper_exec_work [ 2.364000] Call Trace: [ 2.364000] dump_stack+0x1b9/0x294 [ 2.364000] ? dump_stack_print_info.cold.2+0x52/0x52 [ 2.364000] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 2.364000] ? call_usermodehelper_exec_work+0x290/0x310 [ 2.364000] panic+0x22f/0x4de [ 2.364000] ? add_taint.cold.5+0x16/0x16 [ 2.364000] ? do_raw_spin_unlock+0x9e/0x2e0 [ 2.364000] ? do_raw_spin_unlock+0x9e/0x2e0 [ 2.364000] ? call_usermodehelper_exec_work+0x2d3/0x310 [ 2.364000] kasan_end_report+0x47/0x4f [ 2.364000] kasan_report.cold.7+0x76/0x2fe [ 2.364000] __asan_report_store4_noabort+0x17/0x20 [ 2.364000] call_usermodehelper_exec_work+0x2d3/0x310 [ 2.364000] ? call_usermodehelper_exec_async+0x9e0/0x9e0 [ 2.364000] process_one_work+0xc1e/0x1b50 [ 2.364000] ? finish_task_switch+0x28b/0x840 [ 2.364000] ? pwq_dec_nr_in_flight+0x490/0x490 [ 2.364000] ? __schedule+0x809/0x1e30 [ 2.364000] ? graph_lock+0x170/0x170 [ 2.364000] ? lock_downgrade+0x8e0/0x8e0 [ 2.364000] ? find_held_lock+0x36/0x1c0 [ 2.364000] ? lock_acquire+0x1dc/0x520 [ 2.364000] ? worker_thread+0x41f/0x1440 [ 2.364000] ? lock_downgrade+0x8e0/0x8e0 [ 2.364000] ? lock_release+0xa10/0xa10 [ 2.364000] ? kasan_check_read+0x11/0x20 [ 2.364000] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 2.364000] worker_thread+0x1cc/0x1440 [ 2.364000] ? process_one_work+0x1b50/0x1b50 [ 2.364000] ? graph_lock+0x170/0x170 [ 2.364000] ? find_held_lock+0x36/0x1c0 [ 2.364000] ? find_held_lock+0x36/0x1c0 [ 2.364000] ? schedule+0xef/0x430 [ 2.364000] ? __schedule+0x1e30/0x1e30 [ 2.364000] ? do_raw_spin_unlock+0x9e/0x2e0 [ 2.364000] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 2.364000] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 2.364000] ? __kthread_parkme+0x111/0x1d0 [ 2.364000] ? parse_args.cold.15+0x1b3/0x1b3 [ 2.364000] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 2.364000] ? trace_hardirqs_on+0xd/0x10 [ 2.364000] kthread+0x345/0x410 [ 2.364000] ? process_one_work+0x1b50/0x1b50 [ 2.364000] ? kthread_bind+0x40/0x40 [ 2.364000] ret_from_fork+0x3a/0x50 [ 2.364000] Dumping ftrace buffer: [ 2.364000] (ftrace buffer empty) [ 2.364000] Rebooting in 86400 seconds..