FYI, we noticed the below changes on git://git.infradead.org/users/willy/linux-dax.git radix-fixes-2016-04-04 commit e3d550289e0b1c5ee13d32d25f6a8a9c708350c5 ("radix-tree: Fix a bug in radix_tree_range_tag_if_tagged()") +------------------------------------------------------------------+------------+------------+ | | 5931357097 | e3d550289e | +------------------------------------------------------------------+------------+------------+ | boot_successes | 20 | 0 | | boot_failures | 0 | 19 | | invoked_oom-killer:gfp_mask=0x | 0 | 2 | | Mem-Info | 0 | 2 | | Kernel_panic-not_syncing:Out_of_memory_and_no_killable_processes | 0 | 2 | | backtrace:vfs_write | 0 | 2 | | backtrace:SyS_write | 0 | 2 | | backtrace:populate_rootfs | 0 | 2 | | backtrace:kernel_init_freeable | 0 | 2 | | general_protection_fault:#[##]SMP | 0 | 10 | | RIP:radix_tree_range_tag_if_tagged | 0 | 10 | | Kernel_panic-not_syncing:Fatal_exception | 0 | 10 | | backtrace:__close_fd | 0 | 17 | | backtrace:SyS_close | 0 | 17 | | RIP:radix_tree_next_chunk | 0 | 7 | | Kernel_panic-not_syncing:softlockup:hung_tasks | 0 | 7 | +------------------------------------------------------------------+------------+------------+ [ 12.373648] NFS: Registering the id_resolver key type [ 12.374329] Key type id_resolver registered [ 12.374955] Key type id_legacy registered [ 12.614970] general protection fault: 0000 [#1] SMP [ 12.616216] Modules linked in: rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver sr_mod cdrom sg sd_mod ata_generic pata_acpi ppdev crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel ata_piix aesni_intel lrw gf128mul glue_helper ablk_helper cryptd snd_pcm snd_timer snd soundcore pcspkr serio_raw virtio_scsi libata i2c_piix4 floppy parport_pc parport acpi_cpufreq [ 12.624749] CPU: 0 PID: 690 Comm: cat Not tainted 4.6.0-rc1-00045-ge3d5502 #1 [ 12.626020] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014 [ 12.627903] task: ffff88003ee42580 ti: ffff88003ef68000 task.ti: ffff88003ef68000 [ 12.629632] RIP: 0010:[] [] radix_tree_range_tag_if_tagged+0x169/0x1f0 [ 12.631692] RSP: 0018:ffff88003ef6bb10 EFLAGS: 00010046 [ 12.632775] RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000000 [ 12.634066] RDX: 1000000000000230 RSI: ffff88003ef6bb58 RDI: ffff88003f5fe2a8 [ 12.635347] RBP: ffff88003ef6bb48 R08: 0000000000000000 R09: 0000000000000000 [ 12.636642] R10: ffff88003f5b0000 R11: 1000000000000000 R12: 000000000000003f [ 12.637910] R13: 0000000000001000 R14: 0000000000000230 R15: 0000000000000000 [ 12.639180] FS: 00007f57b36c3700(0000) GS:ffff880037200000(0000) knlGS:0000000000000000 [ 12.640987] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 12.642105] CR2: 00007f57b316e390 CR3: 00000000173c0000 CR4: 00000000000406f0 [ 12.643379] Stack: [ 12.644086] 0000000200000046 0000000000000220 ffff88003f5fe2b8 ffff88003f5fe2a0 [ 12.646105] ffff88003f5fe2a8 0007ffffffffffff 0007ffffffffffff ffff88003ef6bb80 [ 12.648118] ffffffff81180b42 0000000000000000 ffff88003f5fe2a0 ffff88003f5fe2a0 [ 12.650140] Call Trace: [ 12.650910] [] tag_pages_for_writeback+0x72/0xf0 [ 12.652088] [] write_cache_pages+0x306/0x520 [ 12.653230] [] ? __might_sleep+0x49/0x80 [ 12.654347] [] ? nfs_do_writepage+0x260/0x260 [ 12.655505] [] ? __set_page_dirty_nobuffers+0xf5/0x150 [ 12.656751] [] nfs_writepages+0xaa/0x140 [ 12.657861] [] do_writepages+0x1e/0x30 [ 12.658953] [] __filemap_fdatawrite_range+0xaa/0xf0 [ 12.660173] [] filemap_write_and_wait_range+0x2a/0x70 [ 12.661416] [] nfs_file_fsync+0x88/0x260 [ 12.662520] [] vfs_fsync_range+0x3d/0xb0 [ 12.663625] [] vfs_fsync+0x1c/0x20 [ 12.664692] [] nfs4_file_flush+0x57/0x80 [nfsv4] [ 12.665887] [] filp_close+0x2f/0x70 [ 12.666952] [] __close_fd+0xae/0xd0 [ 12.668009] [] SyS_close+0x23/0x50 [ 12.669057] [] entry_SYSCALL_64_fastpath+0x1a/0xa4 [ 12.670259] Code: 04 32 49 0f ab 50 08 4d 85 db 75 10 eb 2b 4c 0f ab 42 08 4d 8b 5b 08 4d 85 db 74 1d 49 c1 e9 06 4b 8d 14 33 4d 89 c8 41 83 e0 3f <4c> 0f a3 42 08 19 db 85 db 74 d8 45 31 db 4d 8d 4f 01 49 d3 e1 [ 12.678557] RIP [] radix_tree_range_tag_if_tagged+0x169/0x1f0 [ 12.680344] RSP [ 12.681214] ---[ end trace 3a707eadbaebffde ]--- [ 12.682213] Kernel panic - not syncing: Fatal exception FYI, raw QEMU command line is: qemu-system-x86_64 -enable-kvm -cpu Haswell,+smep,+smap -kernel /pkg/linux/x86_64-rhel/gcc-4.9/e3d550289e0b1c5ee13d32d25f6a8a9c708350c5/vmlinuz-4.6.0-rc1-00045-ge3d5502 -append 'root=/dev/ram0 user=lkp job=/lkp/scheduled/vm-kbuild-1G-1/bisect_boot-1-debian-x86_64-2015-02-07.cgz-x86_64-rhel-e3d550289e0b1c5ee13d32d25f6a8a9c708350c5-20160405-67943-12377zu-0.yaml ARCH=x86_64 kconfig=x86_64-rhel branch=linux-devel/devel-catchup-201604051429 commit=e3d550289e0b1c5ee13d32d25f6a8a9c708350c5 BOOT_IMAGE=/pkg/linux/x86_64-rhel/gcc-4.9/e3d550289e0b1c5ee13d32d25f6a8a9c708350c5/vmlinuz-4.6.0-rc1-00045-ge3d5502 max_uptime=600 RESULT_ROOT=/result/boot/1/vm-kbuild-1G/debian-x86_64-2015-02-07.cgz/x86_64-rhel/gcc-4.9/e3d550289e0b1c5ee13d32d25f6a8a9c708350c5/0 LKP_SERVER=inn earlyprintk=ttyS0,115200 systemd.log_level=err debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 panic=-1 softlockup_panic=1 nmi_watchdog=panic oops=panic load_ramdisk=2 prompt_ramdisk=0 console=ttyS0,115200 console=tty0 vga=normal rw ip=::::vm-kbuild-1G-1::dhcp' -initrd /fs/sda1/initrd-vm-kbuild-1G-1 -m 1024 -smp 2 -device e1000,netdev=net0 -netdev user,id=net0,hostfwd=tcp::23000-:22 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -device virtio-scsi-pci,id=scsi0 -drive file=/fs/sda1/disk0-vm-kbuild-1G-1,if=none,id=hd0,media=disk,aio=native,cache=none -device scsi-hd,bus=scsi0.0,drive=hd0,scsi-id=1,lun=0 -drive file=/fs/sda1/disk1-vm-kbuild-1G-1,if=none,id=hd1,media=disk,aio=native,cache=none -device scsi-hd,bus=scsi0.0,drive=hd1,scsi-id=1,lun=1 -drive file=/fs/sda1/disk2-vm-kbuild-1G-1,if=none,id=hd2,media=disk,aio=native,cache=none -device scsi-hd,bus=scsi0.0,drive=hd2,scsi-id=1,lun=2 -drive file=/fs/sda1/disk3-vm-kbuild-1G-1,if=none,id=hd3,media=disk,aio=native,cache=none -device scsi-hd,bus=scsi0.0,drive=hd3,scsi-id=1,lun=3 -drive file=/fs/sda1/disk4-vm-kbuild-1G-1,if=none,id=hd4,media=disk,aio=native,cache=none -device scsi-hd,bus=scsi0.0,drive=hd4,scsi-id=1,lun=4 -pidfile /dev/shm/kboot/pid-vm-kbuild-1G-1 -serial file:/dev/shm/kboot/serial-vm-kbuild-1G-1 -daemonize -display none -monitor null Thanks, Kernel Test Robot