linux-v3.9-rc3: BUG: Bad page map in process trinity-child6 pte:002f9045 pmd:29e421e1

Using trinity I often trigger under a user mode linux image with host kernel 3.8.4 and guest kernel linux-v3.9-rc3-244-g9217cbb the following :
(The UML guest is a 32bit stable Gentoo Linux)

2013-03-22T18:03:01.232+01:00 trinity kernel: BUG: Bad page map in process trinity-child6  pte:002f9045 pmd:29e421e1
2013-03-22T18:03:01.232+01:00 trinity kernel: page:0920df20 count:1 mapcount:-1 mapping:  (null) index:0x0
2013-03-22T18:03:01.232+01:00 trinity kernel: page flags: 0x400(reserved)
2013-03-22T18:03:01.232+01:00 trinity kernel: addr:00100000 vm_flags:00060055 anon_vma:  (null) mapping:  (null) index:100
2013-03-22T18:03:01.232+01:00 trinity kernel: vma->vm_ops->fault: special_mapping_fault+0x0/0x80
2013-03-22T18:03:01.232+01:00 trinity kernel: 31e87d1c:  [<0833b8b8>] dump_stack+0x22/0x24
2013-03-22T18:03:01.232+01:00 trinity kernel: 31e87d34:  [<0833cc71>] print_bad_pte+0x17b/0x197
2013-03-22T18:03:01.232+01:00 trinity kernel: 31e87d78:  [<080e1138>] unmap_single_vma+0x268/0x430
2013-03-22T18:03:01.232+01:00 trinity kernel: 31e87dd8:  [<080e1837>] unmap_vmas+0x37/0x50
2013-03-22T18:03:01.232+01:00 trinity kernel: 31e87df4:  [<080e4970>] unmap_region+0x80/0xe0
2013-03-22T18:03:01.233+01:00 trinity kernel: 31e87e30:  [<080e6661>] do_munmap+0x231/0x2a0
2013-03-22T18:03:01.233+01:00 trinity kernel: 31e87e68:  [<080e8ae8>] sys_mremap+0x248/0x480
2013-03-22T18:03:01.233+01:00 trinity kernel: 31e87eac:  [<08062a82>] handle_syscall+0x82/0xb0
2013-03-22T18:03:01.233+01:00 trinity kernel: 31e87ef4:  [<08074dfd>] userspace+0x46d/0x590
2013-03-22T18:03:01.233+01:00 trinity kernel: 31e87fec:  [<0805f7bc>] fork_handler+0x6c/0x70
2013-03-22T18:03:01.233+01:00 trinity kernel: 31e87ffc:  [<00000000>] 0x0
2013-03-22T18:03:01.233+01:00 trinity kernel: 2013-03-22T18:03:01.233+01:00 trinity kernel: Disabling lock debugging due to kernel taint
2013-03-22T18:03:01.233+01:00 trinity kernel: BUG: Bad page state in process trinity-child6  pfn:002f9
2013-03-22T18:03:01.233+01:00 trinity kernel: page:0920df20 count:0 mapcount:-1 mapping:  (null) index:0x0
2013-03-22T18:03:01.235+01:00 trinity kernel: page flags: 0x400(reserved)
2013-03-22T18:03:01.235+01:00 trinity kernel: 31e87cd4:  [<0833b8b8>] dump_stack+0x22/0x24
2013-03-22T18:03:01.235+01:00 trinity kernel: 31e87cec:  [<080cd755>] bad_page+0xb5/0xe0
2013-03-22T18:03:01.235+01:00 trinity kernel: 31e87d08:  [<080cd7f3>] free_pages_prepare+0x73/0xb0
2013-03-22T18:03:01.235+01:00 trinity kernel: 31e87d24:  [<080cec1d>] free_hot_cold_page+0x1d/0x100
2013-03-22T18:03:01.235+01:00 trinity kernel: 31e87d4c:  [<080d15ae>] __put_single_page+0x1e/0x30
2013-03-22T18:03:01.235+01:00 trinity kernel: 31e87d60:  [<080d16d7>] put_page+0x27/0x30
2013-03-22T18:03:01.235+01:00 trinity kernel: 31e87d68:  [<080ee6ec>] free_page_and_swap_cache+0x3c/0x50
2013-03-22T18:03:01.235+01:00 trinity kernel: 31e87d78:  [<080e1155>] unmap_single_vma+0x285/0x430
2013-03-22T18:03:01.235+01:00 trinity kernel: 31e87dd8:  [<080e1837>] unmap_vmas+0x37/0x50
2013-03-22T18:03:01.236+01:00 trinity kernel: 31e87df4:  [<080e4970>] unmap_region+0x80/0xe0
2013-03-22T18:03:01.236+01:00 trinity kernel: 31e87e30:  [<080e6661>] do_munmap+0x231/0x2a0
2013-03-22T18:03:01.236+01:00 trinity kernel: 31e87e68:  [<080e8ae8>] sys_mremap+0x248/0x480
2013-03-22T18:03:01.236+01:00 trinity kernel: 31e87eac:  [<08062a82>] handle_syscall+0x82/0xb0
2013-03-22T18:03:01.236+01:00 trinity kernel: 31e87ef4:  [<08074dfd>] userspace+0x46d/0x590
2013-03-22T18:03:01.236+01:00 trinity kernel: 31e87fec:  [<0805f7bc>] fork_handler+0x6c/0x70
2013-03-22T18:03:01.236+01:00 trinity kernel: 31e87ffc:  [<00000000>] 0x0
2013-03-22T18:03:01.236+01:00 trinity kernel: 2013-03-22T18:03:01.236+01:00 trinity kernel: BUG: Bad page map in process trinity-child6  pte:29e38045 pmd:29e421e1
2013-03-22T18:03:01.236+01:00 trinity kernel: page:09744700 count:1 mapcount:-1 mapping:  (null) index:0x0
2013-03-22T18:03:01.237+01:00 trinity kernel: page flags: 0x0()
2013-03-22T18:03:01.237+01:00 trinity kernel: addr:00101000 vm_flags:00060055 anon_vma:  (null) mapping:  (null) index:101
2013-03-22T18:03:01.237+01:00 trinity kernel: vma->vm_ops->fault: special_mapping_fault+0x0/0x80
2013-03-22T18:03:01.237+01:00 trinity kernel: 31e87d1c:  [<0833b8b8>] dump_stack+0x22/0x24
2013-03-22T18:03:01.237+01:00 trinity kernel: 31e87d34:  [<0833cc71>] print_bad_pte+0x17b/0x197
2013-03-22T18:03:01.237+01:00 trinity kernel: 31e87d78:  [<080e1138>] unmap_single_vma+0x268/0x430
2013-03-22T18:03:01.237+01:00 trinity kernel: 31e87dd8:  [<080e1837>] unmap_vmas+0x37/0x50
2013-03-22T18:03:01.237+01:00 trinity kernel: 31e87df4:  [<080e4970>] unmap_region+0x80/0xe0
2013-03-22T18:03:01.237+01:00 trinity kernel: 31e87e30:  [<080e6661>] do_munmap+0x231/0x2a0
2013-03-22T18:03:01.237+01:00 trinity kernel: 31e87e68:  [<080e8ae8>] sys_mremap+0x248/0x480
2013-03-22T18:03:01.238+01:00 trinity kernel: 31e87eac:  [<08062a82>] handle_syscall+0x82/0xb0
2013-03-22T18:03:01.238+01:00 trinity kernel: 31e87ef4:  [<08074dfd>] userspace+0x46d/0x590
2013-03-22T18:03:01.238+01:00 trinity kernel: 31e87fec:  [<0805f7bc>] fork_handler+0x6c/0x70
2013-03-22T18:03:01.238+01:00 trinity kernel: 31e87ffc:  [<00000000>] 0x0
2013-03-22T18:03:01.238+01:00 trinity kernel: 2013-03-22T18:03:01.238+01:00 trinity kernel: BUG: Bad page state in process trinity-child6  pfn:29e38
2013-03-22T18:03:01.238+01:00 trinity kernel: page:09744700 count:0 mapcount:-1 mapping:  (null) index:0x0
2013-03-22T18:03:01.238+01:00 trinity kernel: page flags: 0x0()
2013-03-22T18:03:01.238+01:00 trinity kernel: 31e87cd4:  [<0833b8b8>] dump_stack+0x22/0x24
2013-03-22T18:03:01.238+01:00 trinity kernel: 31e87cec:  [<080cd755>] bad_page+0xb5/0xe0
2013-03-22T18:03:01.239+01:00 trinity kernel: 31e87d08:  [<080cd7f3>] free_pages_prepare+0x73/0xb0
2013-03-22T18:03:01.239+01:00 trinity kernel: 31e87d24:  [<080cec1d>] free_hot_cold_page+0x1d/0x100
2013-03-22T18:03:01.239+01:00 trinity kernel: 31e87d4c:  [<080d15ae>] __put_single_page+0x1e/0x30
2013-03-22T18:03:01.239+01:00 trinity kernel: 31e87d60:  [<080d16d7>] put_page+0x27/0x30
2013-03-22T18:03:01.239+01:00 trinity kernel: 31e87d68:  [<080ee6ec>] free_page_and_swap_cache+0x3c/0x50
2013-03-22T18:03:01.239+01:00 trinity kernel: 31e87d78:  [<080e1155>] unmap_single_vma+0x285/0x430
2013-03-22T18:03:01.239+01:00 trinity kernel: 31e87dd8:  [<080e1837>] unmap_vmas+0x37/0x50
2013-03-22T18:03:01.239+01:00 trinity kernel: 31e87df4:  [<080e4970>] unmap_region+0x80/0xe0
2013-03-22T18:03:01.239+01:00 trinity kernel: 31e87e30:  [<080e6661>] do_munmap+0x231/0x2a0
2013-03-22T18:03:01.239+01:00 trinity kernel: 31e87e68:  [<080e8ae8>] sys_mremap+0x248/0x480
2013-03-22T18:03:01.240+01:00 trinity kernel: 31e87eac:  [<08062a82>] handle_syscall+0x82/0xb0
2013-03-22T18:03:01.240+01:00 trinity kernel: 31e87ef4:  [<08074dfd>] userspace+0x46d/0x590
2013-03-22T18:03:01.240+01:00 trinity kernel: 31e87fec:  [<0805f7bc>] fork_handler+0x6c/0x70
2013-03-22T18:03:01.240+01:00 trinity kernel: 31e87ffc:  [<00000000>] 0x0
2013-03-22T18:03:01.240+01:00 trinity kernel: 2013-03-22T18:03:01.240+01:00 trinity kernel: Stub registers -
2013-03-22T18:03:01.240+01:00 trinity kernel:   0 - 100000
2013-03-22T18:03:01.240+01:00 trinity kernel:   1 - 300000
2013-03-22T18:03:01.240+01:00 trinity kernel:   2 - 0
2013-03-22T18:03:01.240+01:00 trinity kernel:   3 - 0
2013-03-22T18:03:01.243+01:00 trinity kernel:   4 - 0
2013-03-22T18:03:01.243+01:00 trinity kernel:   5 - 0
2013-03-22T18:03:01.243+01:00 trinity kernel:   6 - 0
2013-03-22T18:03:01.243+01:00 trinity kernel:   7 - 7b
2013-03-22T18:03:01.243+01:00 trinity kernel:   8 - 7b
2013-03-22T18:03:01.243+01:00 trinity kernel:   9 - 0
2013-03-22T18:03:01.243+01:00 trinity kernel:   10 - 33
2013-03-22T18:03:01.243+01:00 trinity kernel:   11 - ffffffff
2013-03-22T18:03:01.243+01:00 trinity kernel:   12 - 1000c3
2013-03-22T18:03:01.243+01:00 trinity kernel:   13 - 73
2013-03-22T18:03:01.244+01:00 trinity kernel:   14 - 10206
2013-03-22T18:03:01.244+01:00 trinity kernel:   15 - 101028
2013-03-22T18:03:01.244+01:00 trinity kernel:   16 - 7b
2013-03-22T18:03:01.244+01:00 trinity kernel: wait_stub_done : failed to wait for SIGTRAP, pid = 3143, n = 3143, errno = 0, status = 0xb7f

MfG/Sincerely
Toralf Förster
pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3

#
# Automatically generated file; DO NOT EDIT. # User Mode Linux/x86 3.9.0-rc3 Kernel Configuration # CONFIG_DEFCONFIG_LIST="arch/$ARCH/defconfig" CONFIG_UML=y
CONFIG_MMU=y
CONFIG_NO_IOMEM=y
# CONFIG_TRACE_IRQFLAGS_SUPPORT is not set CONFIG_LOCKDEP_SUPPORT=y
# CONFIG_STACKTRACE_SUPPORT is not set CONFIG_GENERIC_CALIBRATE_DELAY=y CONFIG_GENERIC_BUG=y
CONFIG_HZ=100

#
# UML-specific options
#

#
# Host processor type and features
#
# CONFIG_M486 is not set
# CONFIG_M586 is not set
# CONFIG_M586TSC is not set
# CONFIG_M586MMX is not set
# CONFIG_M686 is not set
# CONFIG_MPENTIUMII is not set
# CONFIG_MPENTIUMIII is not set
# CONFIG_MPENTIUMM is not set
# CONFIG_MPENTIUM4 is not set
# CONFIG_MK6 is not set
# CONFIG_MK7 is not set
# CONFIG_MK8 is not set
# CONFIG_MCRUSOE is not set
# CONFIG_MEFFICEON is not set
# CONFIG_MWINCHIPC6 is not set
# CONFIG_MWINCHIP3D is not set
# CONFIG_MELAN is not set
# CONFIG_MGEODEGX1 is not set
# CONFIG_MGEODE_LX is not set
# CONFIG_MCYRIXIII is not set
# CONFIG_MVIAC3_2 is not set
# CONFIG_MVIAC7 is not set
CONFIG_MCORE2=y
# CONFIG_MATOM is not set
# CONFIG_X86_GENERIC is not set
CONFIG_X86_INTERNODE_CACHE_SHIFT=6
CONFIG_X86_L1_CACHE_SHIFT=6
CONFIG_X86_INTEL_USERCOPY=y
CONFIG_X86_USE_PPRO_CHECKSUM=y
CONFIG_X86_TSC=y
CONFIG_X86_CMPXCHG64=y
CONFIG_X86_CMOV=y
CONFIG_X86_MINIMUM_CPU_FAMILY=5
CONFIG_CPU_SUP_INTEL=y
CONFIG_CPU_SUP_AMD=y
CONFIG_CPU_SUP_CENTAUR=y
CONFIG_CPU_SUP_TRANSMETA_32=y
CONFIG_UML_X86=y
# CONFIG_64BIT is not set
CONFIG_X86_32=y
# CONFIG_X86_64 is not set
# CONFIG_RWSEM_XCHGADD_ALGORITHM is not set
CONFIG_RWSEM_GENERIC_SPINLOCK=y
# CONFIG_3_LEVEL_PGTABLES is not set
CONFIG_ARCH_HAS_SC_SIGNALS=y
CONFIG_ARCH_REUSE_HOST_VSYSCALL_AREA=y
CONFIG_GENERIC_HWEIGHT=y
# CONFIG_STATIC_LINK is not set
CONFIG_FLATMEM=y
CONFIG_FLAT_NODE_MEM_MAP=y
# CONFIG_HAVE_BOOTMEM_INFO_NODE is not set
CONFIG_PAGEFLAGS_EXTENDED=y
CONFIG_SPLIT_PTLOCK_CPUS=4
CONFIG_COMPACTION=y
CONFIG_MIGRATION=y
# CONFIG_PHYS_ADDR_T_64BIT is not set
CONFIG_ZONE_DMA_FLAG=0
CONFIG_KSM=y
CONFIG_DEFAULT_MMAP_MIN_ADDR=4096
CONFIG_CROSS_MEMORY_ATTACH=y
CONFIG_NEED_PER_CPU_KM=y
# CONFIG_CLEANCACHE is not set
# CONFIG_FRONTSWAP is not set
CONFIG_LD_SCRIPT_DYN=y
CONFIG_BINFMT_ELF=y
# CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS is not set
CONFIG_HAVE_AOUT=y
# CONFIG_BINFMT_AOUT is not set
CONFIG_BINFMT_MISC=y
CONFIG_COREDUMP=y
CONFIG_HOSTFS=y
# CONFIG_HPPFS is not set
CONFIG_MCONSOLE=y
CONFIG_MAGIC_SYSRQ=y
CONFIG_KERNEL_STACK_ORDER=2
# CONFIG_MMAPPER is not set
CONFIG_NO_DMA=y
CONFIG_IRQ_WORK=y

#
# General setup
#
CONFIG_BROKEN_ON_SMP=y
CONFIG_INIT_ENV_ARG_LIMIT=128
CONFIG_CROSS_COMPILE=""
CONFIG_LOCALVERSION=""
CONFIG_LOCALVERSION_AUTO=y
CONFIG_DEFAULT_HOSTNAME="(none)"
CONFIG_SWAP=y
CONFIG_SYSVIPC=y
CONFIG_SYSVIPC_SYSCTL=y
# CONFIG_POSIX_MQUEUE is not set
# CONFIG_FHANDLE is not set
CONFIG_AUDIT=y
CONFIG_AUDITSYSCALL=y
CONFIG_AUDIT_WATCH=y
CONFIG_AUDIT_TREE=y
# CONFIG_AUDIT_LOGINUID_IMMUTABLE is not set
CONFIG_HAVE_GENERIC_HARDIRQS=y

#
# IRQ subsystem
#
CONFIG_GENERIC_HARDIRQS=y
CONFIG_GENERIC_IRQ_SHOW=y
# CONFIG_ALWAYS_USE_PERSISTENT_CLOCK is not set
CONFIG_GENERIC_CLOCKEVENTS=y
CONFIG_GENERIC_CLOCKEVENTS_BUILD=y

#
# Timers subsystem
#
CONFIG_TICK_ONESHOT=y
CONFIG_NO_HZ=y
CONFIG_HIGH_RES_TIMERS=y

#
# CPU/Task time and stats accounting
#
CONFIG_TICK_CPU_ACCOUNTING=y
# CONFIG_BSD_PROCESS_ACCT is not set
# CONFIG_TASKSTATS is not set

#
# RCU Subsystem
#
CONFIG_TINY_RCU=y
# CONFIG_PREEMPT_RCU is not set
# CONFIG_RCU_STALL_COMMON is not set
# CONFIG_TREE_RCU_TRACE is not set
CONFIG_IKCONFIG=y
CONFIG_IKCONFIG_PROC=y
CONFIG_LOG_BUF_SHIFT=16
CONFIG_CGROUPS=y
# CONFIG_CGROUP_DEBUG is not set
# CONFIG_CGROUP_FREEZER is not set
# CONFIG_CGROUP_DEVICE is not set
# CONFIG_CPUSETS is not set
# CONFIG_CGROUP_CPUACCT is not set
# CONFIG_RESOURCE_COUNTERS is not set
CONFIG_CGROUP_SCHED=y
CONFIG_FAIR_GROUP_SCHED=y
# CONFIG_CFS_BANDWIDTH is not set
# CONFIG_RT_GROUP_SCHED is not set
# CONFIG_BLK_CGROUP is not set
# CONFIG_CHECKPOINT_RESTORE is not set
CONFIG_NAMESPACES=y
# CONFIG_UTS_NS is not set
# CONFIG_IPC_NS is not set
# CONFIG_USER_NS is not set
# CONFIG_PID_NS is not set
# CONFIG_NET_NS is not set
CONFIG_UIDGID_CONVERTED=y
# CONFIG_UIDGID_STRICT_TYPE_CHECKS is not set
CONFIG_SCHED_AUTOGROUP=y
# CONFIG_SYSFS_DEPRECATED is not set
# CONFIG_RELAY is not set
# CONFIG_BLK_DEV_INITRD is not set
# CONFIG_CC_OPTIMIZE_FOR_SIZE is not set
CONFIG_SYSCTL=y
CONFIG_ANON_INODES=y
# CONFIG_EXPERT is not set
CONFIG_HAVE_UID16=y
CONFIG_UID16=y
# CONFIG_SYSCTL_SYSCALL is not set
CONFIG_KALLSYMS=y
# CONFIG_KALLSYMS_ALL is not set
CONFIG_HOTPLUG=y
CONFIG_PRINTK=y
CONFIG_BUG=y
CONFIG_ELF_CORE=y
CONFIG_BASE_FULL=y
CONFIG_FUTEX=y
CONFIG_EPOLL=y
CONFIG_SIGNALFD=y
CONFIG_TIMERFD=y
CONFIG_EVENTFD=y
CONFIG_SHMEM=y
CONFIG_AIO=y
# CONFIG_EMBEDDED is not set

#
# Kernel Performance Events And Counters
#
CONFIG_VM_EVENT_COUNTERS=y
# CONFIG_COMPAT_BRK is not set
CONFIG_SLAB=y
# CONFIG_SLUB is not set
# CONFIG_PROFILING is not set
# CONFIG_HAVE_64BIT_ALIGNED_ACCESS is not set
CONFIG_ARCH_WANT_IPC_PARSE_VERSION=y
CONFIG_MODULES_USE_ELF_REL=y
CONFIG_CLONE_BACKWARDS=y
CONFIG_OLD_SIGSUSPEND3=y
CONFIG_OLD_SIGACTION=y

#
# GCOV-based kernel profiling
#
# CONFIG_HAVE_GENERIC_DMA_COHERENT is not set
CONFIG_SLABINFO=y
CONFIG_RT_MUTEXES=y
CONFIG_BASE_SMALL=0
# CONFIG_MODULES is not set
CONFIG_BLOCK=y
CONFIG_LBDAF=y
CONFIG_BLK_DEV_BSG=y
# CONFIG_BLK_DEV_BSGLIB is not set
# CONFIG_BLK_DEV_INTEGRITY is not set

#
# Partition Types
#
# CONFIG_PARTITION_ADVANCED is not set
CONFIG_MSDOS_PARTITION=y
CONFIG_EFI_PARTITION=y

#
# IO Schedulers
#
CONFIG_IOSCHED_NOOP=y
# CONFIG_IOSCHED_DEADLINE is not set
# CONFIG_IOSCHED_CFQ is not set
CONFIG_DEFAULT_NOOP=y
CONFIG_DEFAULT_IOSCHED="noop"
CONFIG_INLINE_SPIN_UNLOCK_IRQ=y
CONFIG_INLINE_READ_UNLOCK=y
CONFIG_INLINE_READ_UNLOCK_IRQ=y
CONFIG_INLINE_WRITE_UNLOCK=y
CONFIG_INLINE_WRITE_UNLOCK_IRQ=y
# CONFIG_FREEZER is not set

#
# UML Character Devices
#
CONFIG_STDERR_CONSOLE=y
CONFIG_STDIO_CONSOLE=y
CONFIG_SSL=y
CONFIG_NULL_CHAN=y
CONFIG_PORT_CHAN=y
CONFIG_PTY_CHAN=y
CONFIG_TTY_CHAN=y
CONFIG_XTERM_CHAN=y
# CONFIG_NOCONFIG_CHAN is not set
CONFIG_CON_ZERO_CHAN="fd:0,fd:1"
CONFIG_CON_CHAN="xterm"
CONFIG_SSL_CHAN="pts"
CONFIG_UML_SOUND=y
CONFIG_SOUND=y
CONFIG_SOUND_OSS_CORE=y
CONFIG_HOSTAUDIO=y

#
# Device Drivers
#

#
# Generic Driver Options
#
CONFIG_UEVENT_HELPER_PATH="/sbin/hotplug"
CONFIG_DEVTMPFS=y
CONFIG_DEVTMPFS_MOUNT=y
CONFIG_STANDALONE=y
CONFIG_PREVENT_FIRMWARE_BUILD=y
CONFIG_FW_LOADER=y
CONFIG_FIRMWARE_IN_KERNEL=y
CONFIG_EXTRA_FIRMWARE=""
CONFIG_FW_LOADER_USER_HELPER=y
# CONFIG_DEBUG_DRIVER is not set
# CONFIG_DEBUG_DEVRES is not set
# CONFIG_SYS_HYPERVISOR is not set
CONFIG_GENERIC_CPU_DEVICES=y
# CONFIG_DMA_SHARED_BUFFER is not set

#
# Bus devices
#
# CONFIG_CONNECTOR is not set
# CONFIG_MTD is not set
CONFIG_BLK_DEV=y
CONFIG_BLK_DEV_UBD=y
# CONFIG_BLK_DEV_UBD_SYNC is not set
CONFIG_BLK_DEV_COW_COMMON=y
# CONFIG_BLK_DEV_LOOP is not set
# CONFIG_BLK_DEV_DRBD is not set
# CONFIG_BLK_DEV_NBD is not set
# CONFIG_BLK_DEV_RAM is not set
# CONFIG_ATA_OVER_ETH is not set
# CONFIG_BLK_DEV_RBD is not set

#
# Misc devices
#
# CONFIG_ENCLOSURE_SERVICES is not set
# CONFIG_C2PORT is not set

#
# EEPROM support
#
# CONFIG_EEPROM_93CX6 is not set

#
# Texas Instruments shared transport line discipline #

#
# Altera FPGA firmware download module
#

#
# SCSI device support
#
CONFIG_SCSI_MOD=y
# CONFIG_RAID_ATTRS is not set
# CONFIG_SCSI is not set
# CONFIG_SCSI_DMA is not set
# CONFIG_SCSI_NETLINK is not set
CONFIG_MD=y
# CONFIG_BLK_DEV_MD is not set
CONFIG_BLK_DEV_DM=y
# CONFIG_DM_DEBUG is not set
CONFIG_DM_CRYPT=y
# CONFIG_DM_SNAPSHOT is not set
# CONFIG_DM_THIN_PROVISIONING is not set
# CONFIG_DM_CACHE is not set
# CONFIG_DM_MIRROR is not set
# CONFIG_DM_RAID is not set
# CONFIG_DM_ZERO is not set
# CONFIG_DM_MULTIPATH is not set
# CONFIG_DM_DELAY is not set
CONFIG_DM_UEVENT=y
# CONFIG_DM_FLAKEY is not set
# CONFIG_DM_VERITY is not set
CONFIG_NETDEVICES=y
CONFIG_NET_CORE=y
# CONFIG_BONDING is not set
# CONFIG_DUMMY is not set
# CONFIG_EQUALIZER is not set
# CONFIG_MII is not set
# CONFIG_NET_TEAM is not set
# CONFIG_MACVLAN is not set
# CONFIG_VXLAN is not set
# CONFIG_NETCONSOLE is not set
# CONFIG_NETPOLL is not set
# CONFIG_NET_POLL_CONTROLLER is not set
CONFIG_TUN=y
# CONFIG_VETH is not set

#
# CAIF transport drivers
#

#
# Distributed Switch Architecture drivers
#
# CONFIG_NET_DSA_MV88E6XXX is not set
# CONFIG_NET_DSA_MV88E6060 is not set
# CONFIG_NET_DSA_MV88E6XXX_NEED_PPU is not set
# CONFIG_NET_DSA_MV88E6131 is not set
# CONFIG_NET_DSA_MV88E6123_61_65 is not set
# CONFIG_ETHERNET is not set
# CONFIG_PHYLIB is not set
# CONFIG_PPP is not set
# CONFIG_SLIP is not set
# CONFIG_WLAN is not set

#
# Enable WiMAX (Networking options) to see the WiMAX drivers #
# CONFIG_WAN is not set

#
# Character devices
#
CONFIG_TTY=y
CONFIG_UNIX98_PTYS=y
# CONFIG_DEVPTS_MULTIPLE_INSTANCES is not set
# CONFIG_LEGACY_PTYS is not set
# CONFIG_N_GSM is not set
# CONFIG_TRACE_SINK is not set
CONFIG_DEVKMEM=y
CONFIG_HW_RANDOM=y
CONFIG_UML_RANDOM=y
# CONFIG_R3964 is not set
# CONFIG_NSC_GPIO is not set
# CONFIG_RAW_DRIVER is not set
# CONFIG_I2C is not set
# CONFIG_HSI is not set

#
# PPS support
#
# CONFIG_PPS is not set

#
# PPS generators support
#

#
# PTP clock support
#
# CONFIG_PTP_1588_CLOCK is not set

#
# Enable PHYLIB and NETWORK_PHY_TIMESTAMPING to see the additional clocks. #
# CONFIG_PTP_1588_CLOCK_PCH is not set
# CONFIG_POWER_SUPPLY is not set
# CONFIG_POWER_AVS is not set
# CONFIG_THERMAL is not set
# CONFIG_WATCHDOG is not set
# CONFIG_REGULATOR is not set
# CONFIG_SOUND_OSS_CORE_PRECLAIM is not set
# CONFIG_USB_ARCH_HAS_OHCI is not set
# CONFIG_USB_ARCH_HAS_EHCI is not set
# CONFIG_USB_ARCH_HAS_XHCI is not set
# CONFIG_MEMSTICK is not set
# CONFIG_NEW_LEDS is not set
# CONFIG_ACCESSIBILITY is not set
# CONFIG_AUXDISPLAY is not set
# CONFIG_UIO is not set

#
# Virtio drivers
#

#
# Microsoft Hyper-V guest support
#
# CONFIG_STAGING is not set

#
# Hardware Spinlock drivers
#
# CONFIG_MAILBOX is not set
CONFIG_IOMMU_SUPPORT=y

#
# Remoteproc drivers
#

#
# Rpmsg drivers
#
# CONFIG_VIRT_DRIVERS is not set
# CONFIG_PM_DEVFREQ is not set
# CONFIG_EXTCON is not set
# CONFIG_MEMORY is not set
# CONFIG_IIO is not set
# CONFIG_PWM is not set
CONFIG_NET=y

#
# Networking options
#
CONFIG_PACKET=y
# CONFIG_PACKET_DIAG is not set
CONFIG_UNIX=y
# CONFIG_UNIX_DIAG is not set
CONFIG_XFRM=y
# CONFIG_XFRM_USER is not set
# CONFIG_XFRM_SUB_POLICY is not set
# CONFIG_XFRM_MIGRATE is not set
# CONFIG_XFRM_STATISTICS is not set
# CONFIG_NET_KEY is not set
CONFIG_INET=y
# CONFIG_IP_MULTICAST is not set
# CONFIG_IP_ADVANCED_ROUTER is not set
# CONFIG_IP_PNP is not set
# CONFIG_NET_IPIP is not set
# CONFIG_NET_IPGRE_DEMUX is not set
# CONFIG_ARPD is not set
# CONFIG_SYN_COOKIES is not set
# CONFIG_NET_IPVTI is not set
# CONFIG_INET_AH is not set
# CONFIG_INET_ESP is not set
# CONFIG_INET_IPCOMP is not set
# CONFIG_INET_XFRM_TUNNEL is not set
# CONFIG_INET_TUNNEL is not set
CONFIG_INET_XFRM_MODE_TRANSPORT=y
CONFIG_INET_XFRM_MODE_TUNNEL=y
CONFIG_INET_XFRM_MODE_BEET=y
# CONFIG_INET_LRO is not set
CONFIG_INET_DIAG=y
CONFIG_INET_TCP_DIAG=y
CONFIG_INET_UDP_DIAG=y
# CONFIG_TCP_CONG_ADVANCED is not set
CONFIG_TCP_CONG_CUBIC=y
CONFIG_DEFAULT_TCP_CONG="cubic"
# CONFIG_TCP_MD5SIG is not set
# CONFIG_IPV6 is not set
# CONFIG_NETWORK_SECMARK is not set
# CONFIG_NETWORK_PHY_TIMESTAMPING is not set
# CONFIG_NETFILTER is not set
# CONFIG_IP_DCCP is not set
# CONFIG_IP_SCTP is not set
# CONFIG_RDS is not set
# CONFIG_TIPC is not set
# CONFIG_ATM is not set
# CONFIG_L2TP is not set
# CONFIG_BRIDGE is not set
CONFIG_HAVE_NET_DSA=y
# CONFIG_VLAN_8021Q is not set
# CONFIG_DECNET is not set
# CONFIG_LLC2 is not set
# CONFIG_IPX is not set
# CONFIG_ATALK is not set
# CONFIG_X25 is not set
# CONFIG_LAPB is not set
# CONFIG_PHONET is not set
# CONFIG_IEEE802154 is not set
# CONFIG_NET_SCHED is not set
# CONFIG_DCB is not set
CONFIG_DNS_RESOLVER=y
# CONFIG_BATMAN_ADV is not set
# CONFIG_OPENVSWITCH is not set
# CONFIG_VSOCKETS is not set
# CONFIG_NETPRIO_CGROUP is not set
CONFIG_BQL=y

#
# Network testing
#
# CONFIG_NET_PKTGEN is not set
# CONFIG_HAMRADIO is not set
# CONFIG_CAN is not set
# CONFIG_IRDA is not set
# CONFIG_BT is not set
# CONFIG_AF_RXRPC is not set
# CONFIG_WIRELESS is not set
# CONFIG_WIMAX is not set
# CONFIG_RFKILL is not set
# CONFIG_NET_9P is not set
# CONFIG_CAIF is not set
# CONFIG_CEPH_LIB is not set
# CONFIG_NFC is not set

#
# UML Network Devices
#
CONFIG_UML_NET=y
CONFIG_UML_NET_ETHERTAP=y
CONFIG_UML_NET_TUNTAP=y
# CONFIG_UML_NET_SLIP is not set
# CONFIG_UML_NET_DAEMON is not set
# CONFIG_UML_NET_VDE is not set
CONFIG_UML_NET_MCAST=y
# CONFIG_UML_NET_PCAP is not set
# CONFIG_UML_NET_SLIRP is not set

#
# File systems
#
CONFIG_EXT2_FS=y
CONFIG_EXT2_FS_XATTR=y
# CONFIG_EXT2_FS_POSIX_ACL is not set
# CONFIG_EXT2_FS_SECURITY is not set
# CONFIG_EXT2_FS_XIP is not set
CONFIG_EXT3_FS=y
# CONFIG_EXT3_DEFAULTS_TO_ORDERED is not set
CONFIG_EXT3_FS_XATTR=y
# CONFIG_EXT3_FS_POSIX_ACL is not set
# CONFIG_EXT3_FS_SECURITY is not set
CONFIG_EXT4_FS=y
# CONFIG_EXT4_FS_POSIX_ACL is not set
# CONFIG_EXT4_FS_SECURITY is not set
CONFIG_EXT4_DEBUG=y
CONFIG_JBD=y
CONFIG_JBD2=y
CONFIG_FS_MBCACHE=y
# CONFIG_REISERFS_FS is not set
# CONFIG_JFS_FS is not set
# CONFIG_XFS_FS is not set
# CONFIG_GFS2_FS is not set
# CONFIG_BTRFS_FS is not set
# CONFIG_NILFS2_FS is not set
CONFIG_FS_POSIX_ACL=y
CONFIG_EXPORTFS=y
CONFIG_FILE_LOCKING=y
CONFIG_FSNOTIFY=y
CONFIG_DNOTIFY=y
CONFIG_INOTIFY_USER=y
CONFIG_FANOTIFY=y
# CONFIG_QUOTA is not set
# CONFIG_QUOTACTL is not set
# CONFIG_AUTOFS4_FS is not set
# CONFIG_FUSE_FS is not set
CONFIG_GENERIC_ACL=y

#
# Caches
#
# CONFIG_FSCACHE is not set

#
# CD-ROM/DVD Filesystems
#
CONFIG_ISO9660_FS=y
CONFIG_JOLIET=y
# CONFIG_ZISOFS is not set
# CONFIG_UDF_FS is not set

#
# DOS/FAT/NT Filesystems
#
# CONFIG_MSDOS_FS is not set
# CONFIG_VFAT_FS is not set
# CONFIG_NTFS_FS is not set

#
# Pseudo filesystems
#
CONFIG_PROC_FS=y
CONFIG_PROC_KCORE=y
CONFIG_PROC_SYSCTL=y CONFIG_PROC_PAGE_MONITOR=y
CONFIG_SYSFS=y
CONFIG_TMPFS=y
CONFIG_TMPFS_POSIX_ACL=y
CONFIG_TMPFS_XATTR=y
# CONFIG_HUGETLB_PAGE is not set
# CONFIG_CONFIGFS_FS is not set
# CONFIG_MISC_FILESYSTEMS is not set CONFIG_NETWORK_FILESYSTEMS=y
CONFIG_NFS_FS=y
CONFIG_NFS_V2=y
CONFIG_NFS_V3=y
# CONFIG_NFS_V3_ACL is not set CONFIG_NFS_V4=y
# CONFIG_NFS_SWAP is not set CONFIG_NFS_V4_1=y
CONFIG_PNFS_FILE_LAYOUT=y
CONFIG_PNFS_BLOCK=y CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN="kernel.org" # CONFIG_NFS_USE_LEGACY_DNS is not set CONFIG_NFS_USE_KERNEL_DNS=y
CONFIG_NFSD=y
CONFIG_NFSD_V3=y
# CONFIG_NFSD_V3_ACL is not set CONFIG_NFSD_V4=y
# CONFIG_NFSD_FAULT_INJECTION is not set CONFIG_LOCKD=y
CONFIG_LOCKD_V4=y
CONFIG_NFS_COMMON=y
CONFIG_SUNRPC=y
CONFIG_SUNRPC_GSS=y CONFIG_SUNRPC_BACKCHANNEL=y
# CONFIG_SUNRPC_DEBUG is not set
# CONFIG_CEPH_FS is not set
# CONFIG_CIFS is not set
# CONFIG_NCP_FS is not set
# CONFIG_CODA_FS is not set
# CONFIG_AFS_FS is not set
CONFIG_NLS=y
CONFIG_NLS_DEFAULT="iso8859-1" CONFIG_NLS_CODEPAGE_437=y
# CONFIG_NLS_CODEPAGE_737 is not set
# CONFIG_NLS_CODEPAGE_775 is not set CONFIG_NLS_CODEPAGE_850=y
# CONFIG_NLS_CODEPAGE_852 is not set
# CONFIG_NLS_CODEPAGE_855 is not set
# CONFIG_NLS_CODEPAGE_857 is not set
# CONFIG_NLS_CODEPAGE_860 is not set
# CONFIG_NLS_CODEPAGE_861 is not set
# CONFIG_NLS_CODEPAGE_862 is not set
# CONFIG_NLS_CODEPAGE_863 is not set
# CONFIG_NLS_CODEPAGE_864 is not set
# CONFIG_NLS_CODEPAGE_865 is not set
# CONFIG_NLS_CODEPAGE_866 is not set
# CONFIG_NLS_CODEPAGE_869 is not set
# CONFIG_NLS_CODEPAGE_936 is not set
# CONFIG_NLS_CODEPAGE_950 is not set
# CONFIG_NLS_CODEPAGE_932 is not set
# CONFIG_NLS_CODEPAGE_949 is not set
# CONFIG_NLS_CODEPAGE_874 is not set
# CONFIG_NLS_ISO8859_8 is not set
# CONFIG_NLS_CODEPAGE_1250 is not set
# CONFIG_NLS_CODEPAGE_1251 is not set
# CONFIG_NLS_ASCII is not set
# CONFIG_NLS_ISO8859_1 is not set
# CONFIG_NLS_ISO8859_2 is not set
# CONFIG_NLS_ISO8859_3 is not set
# CONFIG_NLS_ISO8859_4 is not set
# CONFIG_NLS_ISO8859_5 is not set
# CONFIG_NLS_ISO8859_6 is not set
# CONFIG_NLS_ISO8859_7 is not set
# CONFIG_NLS_ISO8859_9 is not set
# CONFIG_NLS_ISO8859_13 is not set
# CONFIG_NLS_ISO8859_14 is not set CONFIG_NLS_ISO8859_15=y
# CONFIG_NLS_KOI8_R is not set
# CONFIG_NLS_KOI8_U is not set
# CONFIG_NLS_MAC_ROMAN is not set
# CONFIG_NLS_MAC_CELTIC is not set
# CONFIG_NLS_MAC_CENTEURO is not set
# CONFIG_NLS_MAC_CROATIAN is not set
# CONFIG_NLS_MAC_CYRILLIC is not set
# CONFIG_NLS_MAC_GAELIC is not set
# CONFIG_NLS_MAC_GREEK is not set
# CONFIG_NLS_MAC_ICELAND is not set
# CONFIG_NLS_MAC_INUIT is not set
# CONFIG_NLS_MAC_ROMANIAN is not set
# CONFIG_NLS_MAC_TURKISH is not set CONFIG_NLS_UTF8=y

#
# Security options
#
CONFIG_KEYS=y
# CONFIG_ENCRYPTED_KEYS is not set
# CONFIG_KEYS_DEBUG_PROC_KEYS is not set
CONFIG_SECURITY_DMESG_RESTRICT=y
# CONFIG_SECURITY is not set
# CONFIG_SECURITYFS is not set
CONFIG_DEFAULT_SECURITY_DAC=y
CONFIG_DEFAULT_SECURITY=""
CONFIG_CRYPTO=y

#
# Crypto core or helper
#
CONFIG_CRYPTO_ALGAPI=y
CONFIG_CRYPTO_ALGAPI2=y
CONFIG_CRYPTO_AEAD2=y
CONFIG_CRYPTO_BLKCIPHER=y
CONFIG_CRYPTO_BLKCIPHER2=y
CONFIG_CRYPTO_HASH=y
CONFIG_CRYPTO_HASH2=y
CONFIG_CRYPTO_RNG2=y
CONFIG_CRYPTO_PCOMP2=y
CONFIG_CRYPTO_MANAGER=y
CONFIG_CRYPTO_MANAGER2=y
# CONFIG_CRYPTO_USER is not set
# CONFIG_CRYPTO_MANAGER_DISABLE_TESTS is not set
# CONFIG_CRYPTO_GF128MUL is not set
# CONFIG_CRYPTO_NULL is not set
CONFIG_CRYPTO_WORKQUEUE=y
# CONFIG_CRYPTO_CRYPTD is not set
# CONFIG_CRYPTO_AUTHENC is not set

#
# Authenticated Encryption with Associated Data
#
# CONFIG_CRYPTO_CCM is not set
# CONFIG_CRYPTO_GCM is not set
# CONFIG_CRYPTO_SEQIV is not set

#
# Block modes
#
CONFIG_CRYPTO_CBC=y
# CONFIG_CRYPTO_CTR is not set
# CONFIG_CRYPTO_CTS is not set
# CONFIG_CRYPTO_ECB is not set
# CONFIG_CRYPTO_LRW is not set
# CONFIG_CRYPTO_PCBC is not set
# CONFIG_CRYPTO_XTS is not set

#
# Hash modes
#
# CONFIG_CRYPTO_HMAC is not set
# CONFIG_CRYPTO_XCBC is not set
# CONFIG_CRYPTO_VMAC is not set

#
# Digest
#
CONFIG_CRYPTO_CRC32C=y
# CONFIG_CRYPTO_CRC32 is not set
# CONFIG_CRYPTO_GHASH is not set
# CONFIG_CRYPTO_MD4 is not set
# CONFIG_CRYPTO_MD5 is not set
# CONFIG_CRYPTO_MICHAEL_MIC is not set
# CONFIG_CRYPTO_RMD128 is not set
# CONFIG_CRYPTO_RMD160 is not set
# CONFIG_CRYPTO_RMD256 is not set
# CONFIG_CRYPTO_RMD320 is not set
# CONFIG_CRYPTO_SHA1 is not set
CONFIG_CRYPTO_SHA256=y
# CONFIG_CRYPTO_SHA512 is not set
# CONFIG_CRYPTO_TGR192 is not set
# CONFIG_CRYPTO_WP512 is not set

#
# Ciphers
#
CONFIG_CRYPTO_AES=y
CONFIG_CRYPTO_AES_586=y
# CONFIG_CRYPTO_ANUBIS is not set
# CONFIG_CRYPTO_ARC4 is not set
# CONFIG_CRYPTO_BLOWFISH is not set
# CONFIG_CRYPTO_CAMELLIA is not set
# CONFIG_CRYPTO_CAST5 is not set
# CONFIG_CRYPTO_CAST6 is not set
# CONFIG_CRYPTO_DES is not set
# CONFIG_CRYPTO_FCRYPT is not set
# CONFIG_CRYPTO_KHAZAD is not set
# CONFIG_CRYPTO_SALSA20 is not set
# CONFIG_CRYPTO_SALSA20_586 is not set
# CONFIG_CRYPTO_SEED is not set
# CONFIG_CRYPTO_SERPENT is not set
# CONFIG_CRYPTO_TEA is not set
# CONFIG_CRYPTO_TWOFISH is not set
# CONFIG_CRYPTO_TWOFISH_586 is not set

#
# Compression
#
# CONFIG_CRYPTO_DEFLATE is not set
# CONFIG_CRYPTO_ZLIB is not set
# CONFIG_CRYPTO_LZO is not set

#
# Random Number Generation
#
# CONFIG_CRYPTO_ANSI_CPRNG is not set
# CONFIG_CRYPTO_USER_API_HASH is not set
# CONFIG_CRYPTO_USER_API_SKCIPHER is not set
# CONFIG_CRYPTO_HW is not set
# CONFIG_ASYMMETRIC_KEY_TYPE is not set
# CONFIG_BINARY_PRINTF is not set

#
# Library routines
#
CONFIG_BITREVERSE=y
CONFIG_GENERIC_FIND_FIRST_BIT=y
CONFIG_GENERIC_IO=y
# CONFIG_CRC_CCITT is not set
CONFIG_CRC16=y
# CONFIG_CRC_T10DIF is not set
# CONFIG_CRC_ITU_T is not set
CONFIG_CRC32=y
# CONFIG_CRC32_SELFTEST is not set
CONFIG_CRC32_SLICEBY8=y
# CONFIG_CRC32_SLICEBY4 is not set
# CONFIG_CRC32_SARWATE is not set
# CONFIG_CRC32_BIT is not set
# CONFIG_CRC7 is not set
# CONFIG_LIBCRC32C is not set
# CONFIG_CRC8 is not set
CONFIG_AUDIT_GENERIC=y
# CONFIG_XZ_DEC is not set
# CONFIG_XZ_DEC_BCJ is not set
CONFIG_DQL=y
CONFIG_NLATTR=y
# CONFIG_AVERAGE is not set
# CONFIG_CORDIC is not set
# CONFIG_DDR is not set

#
# Kernel hacking
#
# CONFIG_PRINTK_TIME is not set
CONFIG_DEFAULT_MESSAGE_LOGLEVEL=4
# CONFIG_ENABLE_WARN_DEPRECATED is not set
# CONFIG_ENABLE_MUST_CHECK is not set
CONFIG_FRAME_WARN=1024
# CONFIG_STRIP_ASM_SYMS is not set
CONFIG_READABLE_ASM=y
# CONFIG_UNUSED_SYMBOLS is not set
# CONFIG_DEBUG_FS is not set
# CONFIG_DEBUG_SECTION_MISMATCH is not set
CONFIG_DEBUG_KERNEL=y
# CONFIG_DEBUG_SHIRQ is not set
CONFIG_LOCKUP_DETECTOR=y
# CONFIG_BOOTPARAM_SOFTLOCKUP_PANIC is not set
CONFIG_BOOTPARAM_SOFTLOCKUP_PANIC_VALUE=0
# CONFIG_PANIC_ON_OOPS is not set
CONFIG_PANIC_ON_OOPS_VALUE=0
CONFIG_DETECT_HUNG_TASK=y
CONFIG_DEFAULT_HUNG_TASK_TIMEOUT=120
# CONFIG_BOOTPARAM_HUNG_TASK_PANIC is not set
CONFIG_BOOTPARAM_HUNG_TASK_PANIC_VALUE=0
# CONFIG_SCHED_DEBUG is not set
# CONFIG_SCHEDSTATS is not set
CONFIG_TIMER_STATS=y
# CONFIG_DEBUG_OBJECTS is not set
CONFIG_DEBUG_SLAB=y
CONFIG_DEBUG_SLAB_LEAK=y
# CONFIG_DEBUG_RT_MUTEXES is not set
# CONFIG_RT_MUTEX_TESTER is not set
# CONFIG_DEBUG_SPINLOCK is not set
# CONFIG_DEBUG_MUTEXES is not set
# CONFIG_DEBUG_ATOMIC_SLEEP is not set
# CONFIG_DEBUG_LOCKING_API_SELFTESTS is not set
# CONFIG_DEBUG_STACK_USAGE is not set
# CONFIG_DEBUG_KOBJECT is not set
CONFIG_DEBUG_BUGVERBOSE=y
CONFIG_DEBUG_INFO=y
CONFIG_DEBUG_INFO_REDUCED=y
# CONFIG_DEBUG_VM is not set
# CONFIG_DEBUG_WRITECOUNT is not set
CONFIG_DEBUG_MEMORY_INIT=y
# CONFIG_DEBUG_LIST is not set
# CONFIG_TEST_LIST_SORT is not set
# CONFIG_DEBUG_SG is not set
# CONFIG_DEBUG_NOTIFIERS is not set
# CONFIG_DEBUG_CREDENTIALS is not set
CONFIG_FRAME_POINTER=y
# CONFIG_BOOT_PRINTK_DELAY is not set

#
# RCU Debugging
#
# CONFIG_SPARSE_RCU_POINTER is not set
# CONFIG_RCU_TORTURE_TEST is not set
# CONFIG_RCU_TRACE is not set
# CONFIG_BACKTRACE_SELF_TEST is not set
# CONFIG_DEBUG_BLOCK_EXT_DEVT is not set
# CONFIG_DEBUG_FORCE_WEAK_PER_CPU is not set
# CONFIG_NOTIFIER_ERROR_INJECTION is not set
# CONFIG_FAULT_INJECTION is not set
# CONFIG_DEBUG_PAGEALLOC is not set
# CONFIG_ATOMIC64_SELFTEST is not set
# CONFIG_SAMPLES is not set
# CONFIG_TEST_KSTRTOX is not set
# CONFIG_GPROF is not set
# CONFIG_GCOV is not set
CONFIG_EARLY_PRINTK=y

I assume 3.8 is OK?

mapcount=-1.

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With UML kernel 3.7.10 (host kernel still 3.8.4) I can trigger this issue too.
Just to clarify it - here the bug appears in the UML kernel - the host kernel is ok (I can of course crash a host kernel too by trinity'ing an UML guest, but that's another thread - see [1])

FWIW he trinity command is just a test of 1 syscall:

$> trinity --children 1 --victims /mnt/nfs/n22/victims -c mremap

[1] https://lkml.org/lkml/2013/3/24/174

MfG/Sincerely
Toralf FA?rster
pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3

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I should think it's been like this for five years, or even more: maybe you are the first person to try unmapping user address 0x100000 on UML; though it's odd that you find it using mremap than the more common munmap.

uml_setup_stubs() sets up the special vma with install_special_mapping(), but instead of then faulting in the two pages concerned, it has preset the ptes with init_stub_pte(), which did not increment page mapcount.

munmap() that area (or set up another mapping in that place), and zap_pte_range() will decrement page mapcount negative, hence the "Bad page" errors. Whereas UML uses an arch_exit_mmap() hook to clear the ptes at exit time, to avoid encountering such errors.

I think that adding VM_PFNMAP to those install_special_mapping() flags would be enough to fix it (and avoid the need for the arch_exit_mmap(), and let vm_insert_pfn() do the work of init_stub_pte()); but I'm not certain that would be the approved way, and I may have missed problems doing it like this (which would disallow get_user_pages(), e.g. ptrace, on that area: which might or might not be a good thing, I don't know).

I'm saying this just by examination, I've not tried any of it at all. Over to Richard.

Hugh

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Sounds sane.
I fear trinity will find more "you are the first person to try"-bugs in UML. I'll look at it.

:-)

Thanks,
//richard

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