[ 76.906896] random: nonblocking pool is initialized [ 89.508346] BUG: unable to handle kernel NULL pointer dereference at (null) [ 89.511075] IP: [] mpage_process_page_bufs+0x2b/0x120 [ext4] [ 89.512089] PGD 1b755f067 PUD 167e1e067 PMD 0 [ 89.512089] Oops: 0000 [#1] SMP [ 89.512089] Modules linked in: nfsd auth_rpcgss oid_registry nfs_acl nfs lockd fscache sunrpc netconsole configfs loop crct10dif_pclmul crct10dif_common crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw psmouse gf128mul glue_helper i2c_piix4 virtio_console ablk_helper serio_raw pcspkr parport_pc pvpanic cryptd i2c_core evdev parport processor thermal_sys button ext4 crc16 [ 89.530893] mon-agent[2185]: segfault at 10 ip 00007fa05ae592a8 sp 00007fff1f5ed2c0 error 4 [ 89.530985] in libc-2.13.so[7fa05ade1000+181000] [ 89.532418] fio[2710]: segfault at 0 ip 0000000000439970 sp 00007fffa3f4e808 error 6 [ 89.532452] in fio[400000+58000] [ 89.512089] mbcache [ 89.512089] jbd2 ata_generic virtio_blk virtio_net floppy crc32c_intel xhci_hcd ata_piix usbcore libata usb_common virtio_pci virtio_ring virtio scsi_mod [ 89.512089] CPU: 4 PID: 2715 Comm: fio Not tainted 3.16.7-ckt9 #1 [ 89.512089] Hardware name: SuperMicro Virtual Appliance, BIOS 1.1 [ 89.512089] task: ffff8801b0d00210 ti: ffff8801b3f70000 task.ti: ffff8801b3f70000 [ 89.512089] RIP: 0010:[] [] mpage_process_page_bufs+0x2b/0x120 [ext4] [ 89.512089] RSP: 0018:ffff8801b3f73cb8 EFLAGS: 00010213 [ 89.512089] RAX: 0000000000000000 RBX: 0000000000007824 RCX: 000000000000000c [ 89.512089] RDX: 0000000000000000 RSI: ffff8804a7c01f98 RDI: ffff8801b3f73e58 [ 89.512089] RBP: 000000000000c000 R08: 0000000000000000 R09: 20004c74b3000000 [ 89.512089] R10: dfff3b8b601d2cc0 R11: ffff88001ffdbe00 R12: 000000000000bfff [ 89.512089] R13: ffff8801b3f73d88 R14: ffff8801b3f73e58 R15: ffff8800131d2d00 [ 89.512089] FS: 00007fba4235e700(0000) GS:ffff88001fd00000(0000) knlGS:0000000000000000 [ 89.512089] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 89.512089] CR2: 0000000000000000 CR3: 000000014e9a5000 CR4: 00000000000406e0 [ 89.512089] Stack: [ 89.512089] ffff8800131d2b80 ffff8801b3f73d48 7fffffffffffcbdc ffffffffa0151506 [ 89.512089] 0000000000000000 ffff8801b784f600 ffff8801b3f73d20 0000000000000000 [ 89.512089] 0000000000000004 000000000000782c 000000000000000e 0000000000000000 [ 89.512089] Call Trace: [ 89.512089] [] ? mpage_prepare_extent_to_map+0x1d6/0x280 [ext4] [ 89.512089] [] ? ext4_writepages+0x3ef/0xd00 [ext4] [ 89.512089] [] ? security_file_permission+0x2f/0xd0 [ 89.512089] [] ? __filemap_fdatawrite_range+0x51/0x60 [ 89.512089] [] ? SyS_fadvise64+0x24d/0x260 [ 89.512089] [] ? system_call_fast_compare_end+0x10/0x15 [ 89.512089] Code: 66 66 66 66 90 55 bd 01 00 00 00 53 89 cb 48 83 ec 08 48 8b 07 8b 88 90 00 00 00 d3 e5 48 63 ed 48 03 68 50 48 83 ed 01 48 d3 fd <48> 8b 02 a8 04 0f 85 e7 00 00 00 39 eb 0f 83 a2 00 00 00 48 8b [ 89.512089] RIP [] mpage_process_page_bufs+0x2b/0x120 [ext4] [ 89.512089] RSP [ 89.512089] CR2: 0000000000000000 [ 89.609566] ---[ end trace 213ee878070f2ba5 ]--- [ 89.610884] ------------[ cut here ]------------ [ 89.612246] WARNING: CPU: 4 PID: 2715 at kernel/exit.c:669 do_exit+0x4d/0xa30() [ 89.614252] Modules linked in: nfsd auth_rpcgss oid_registry nfs_acl nfs lockd fscache sunrpc netconsole configfs loop crct10dif_pclmul crct10dif_common crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw psmouse gf128mul glue_helper i2c_piix4 virtio_console ablk_helper serio_raw pcspkr parport_pc pvpanic cryptd i2c_core evdev parport processor thermal_sys button ext4 crc16 mbcache jbd2 ata_generic virtio_blk virtio_net floppy crc32c_intel xhci_hcd ata_piix usbcore libata usb_common virtio_pci virtio_ring virtio scsi_mod [ 89.635186] CPU: 4 PID: 2715 Comm: fio Tainted: G D 3.16.7-ckt9 #1 [ 89.637099] Hardware name: SuperMicro Virtual Appliance, BIOS 1.1 [ 89.638779] 0000000000000000 0000000000000009 ffffffff8154731e 0000000000000000 [ 89.641533] ffffffff8106cd0b 0000000000000009 ffff8801b3f73c08 0000000000000296 [ 89.644158] 0000000000000000 0000000000000296 ffffffff8106eecd 0000000000000000 [ 89.646974] Call Trace: [ 89.647753] [] ? dump_stack+0x41/0x51 [ 89.649242] [] ? warn_slowpath_common+0x8b/0xc0 [ 89.650943] [] ? do_exit+0x4d/0xa30 [ 89.652391] [] ? printk+0x54/0x59 [ 89.653824] [] ? oops_end+0x9b/0xe0 [ 89.655234] [] ? no_context+0x2a4/0x2cf [ 89.656773] [] ? __do_page_fault+0x423/0x520 [ 89.658438] [] ? blk_account_io_start+0x112/0x180 [ 89.660150] [] ? mempool_alloc+0x69/0x190 [ 89.661753] [] ? mem_cgroup_update_page_stat+0x1d/0x60 [ 89.663595] [] ? async_page_fault+0x28/0x30 [ 89.665214] [] ? mpage_process_page_bufs+0x2b/0x120 [ext4] [ 89.667172] [] ? mpage_process_page_bufs+0xf0/0x120 [ext4] [ 89.669104] [] ? mpage_prepare_extent_to_map+0x1d6/0x280 [ext4] [ 89.671132] [] ? ext4_writepages+0x3ef/0xd00 [ext4] [ 89.672909] [] ? security_file_permission+0x2f/0xd0 [ 89.674683] [] ? __filemap_fdatawrite_range+0x51/0x60 [ 89.676513] [] ? SyS_fadvise64+0x24d/0x260 [ 89.678115] [] ? system_call_fast_compare_end+0x10/0x15 [ 89.679936] ---[ end trace 213ee878070f2ba6 ]---