I got 2 kernel panics today, from one of them I have a stack trace. To me it looks quite simular :-( Both the host and the client are now on: 3.16.0-4-amd64 #1 Debian 3.16.39-1+deb8u2 So unfortunately, I am back where I started :-(
The backtrace: general protection fault: 0000 [#1] SMP [1908184.656190] Moduls linked in: nf_nat_ftp nf_conntrack_ftp dm_snapshot dm_bufio ipt_REJECT xt_limit xt_nat xt_LOG xt_tcpudp xt_state iptable_nat nf_nat_ipv4 iptable_filter ip_tables x_tables nf_nat nf_conntrack_tftp nf_conntrack_ipv4 nf_defrag_ipv4 nf_conntrack quota_v2 quota_tree nfsd auth_rpcgss oid_registry nfs_acl nfs lockd fscache sunrpc 8021q garp stp mrp llc raw fuse parport_pc parport pvpanic psmouse serio_raw ttm i2c_piix4 9pnet_virtio 9pnet drm_kms_helper evdev button virtio_balloon pcspkr drm i2c_core processor thermal_sys hid_generic usbhid hid ext4 crc16 mbcache jbd2 dm_mod md_mod sr_mod cdrom mptscsih mptbase aic7xxx sym53c8xx scsi_transport_spi BusLogic ata_generic virtio_blk virtio_net floppy uhci_hcd ehci_hcd virtio_pci ata_piixvirtio_ring virtio libata usbcore scsi_mod usb_common [last unloaded: nf_conntrack_ftp] [1908184.656190] CPU: 0 PID: 22045 Comm: kworker/u8:0 Not tainted 3.16.0-4-amd64 #1 Debian 3.16.39-1+deb8u2 [1908184.656190] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [1908184.656190] Workqueue: writeback bdi_writeback_workfn (flush-252:23) [1908184.656190] task: ffff88003630aaa0 ti: ffff8801020ec000 task.ti: ffff8801020ec000 [1908184.656190] RIP: 0010:[<ffffffff812882ee>] [<ffffffff812882ee>] __blk_bios_map_sg+0x1de/0x400 [1908184.656190] RSP: 0018:ffff8801020ef890 EFLAGS: 00010206^M [1908184.656190] RAX: 2e202e2d2e3a2e44 RBX: 0000000000000800 RCX: 0000000000000002 [1908184.656190] RDX: 2e202e2d2e3a2e47 RSI: ffffea00010d2298 RDI: 0000000000000000 [1908184.656190] RBP: ffff8801020ef910 R08: ffff8800db5ce020 R09: 0000000000000080 [1908184.656190] R10: 0000000000000000 R11: 00000000cf967000 R12: 0000000000000000 [1908184.656190] R13: 0000000000000800 R14: 0000000000000002 R15: ffff8801020ef920 [1908184.656190] FS: 0000000000000000(0000) GS:ffff880119c00000(0000) knlGS:0000000000000000 [1908184.656190] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [1908184.656190] CR2: 0000000008fd832c CR3: 0000000114038000 CR4: 00000000000006f0 [1908184.656190] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [1908184.656190] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [1908184.656190] Stack: [1908184.656190] 00ffffff8128d680 ffff8800d7c9b320 ffff88011471e7c8 0100005700000017 [1908184.656190] ffff8800db5ce020 ffff880100000080 0000000000000002 ffffea00010d2298 [1908184.656190] 0000000000000800 ffffea0002d68e50 0000000000001000 ffff8800d7c9b180 [1908184.656190] Call Trace: [1908184.656190] [<ffffffff8128853f>] ? blk_rq_map_sg+0x2f/0x170 [1908184.656190] [<ffffffffa007c4db>] ? virtio_queue_rq+0x9b/0x240 [virtio_blk] [1908184.656190] [<ffffffff8128c172>] ? __blk_mq_run_hw_queue+0x1c2/0x320 [1908184.656190] [<ffffffff8128d52d>] ? blk_mq_insert_requests+0xcd/0x150 [1908184.656190] [<ffffffff8128e059>] ? blk_mq_flush_plug_list+0x129/0x140 [1908184.656190] [<ffffffff81284663>] ? blk_flush_plug_list+0xe3/0x230 [1908184.656190] [<ffffffff81284b60>] ? blk_finish_plug+0x10/0x40 [1908184.656190] [<ffffffffa01df0be>] ? ext4_writepages+0x4ce/0xd30 [ext4] [1908184.656190] [<ffffffff811d15d9>] ? __writeback_single_inode+0x39/0x2b0 [1908184.656190] [<ffffffff811d2334>] ? writeback_sb_inodes+0x1a4/0x400 [1908184.656190] [<ffffffff811d2626>] ? __writeback_inodes_wb+0x96/0xc0 [1908184.656190] [<ffffffff811d28d3>] ? wb_writeback+0x283/0x330 [1908184.656190] [<ffffffff811d4b9c>] ? bdi_writeback_workfn+0x1dc/0x480 [1908184.656190] [<ffffffff81082bb3>] ? process_one_work+0x143/0x430 [1908184.656190] [<ffffffff81083333>] ? worker_thread+0x113/0x4f0 [1908184.656190] [<ffffffff81083220>] ? rescuer_thread+0x2d0/0x2d0 [1908184.656190] [<ffffffff810894fd>] ? kthread+0xbd/0xe0 [1908184.656190] [<ffffffff81089440>] ? kthread_create_on_node+0x180/0x180 [1908184.656190] [<ffffffff8151ad98>] ? ret_from_fork+0x58/0x90 [1908184.656190] [<ffffffff81089440>] ? kthread_create_on_node+0x180/0x180 [1908184.656190] Code: 3f 44 89 4c 24 28 48 89 4c 24 30 e8 bd 5a 03 00 8b 7c 24 44 48 8b 74 24 38 4c 8b 44 24 20 44 8b 4c 24 28 48 8b 4c 24 30 49 89 07 <48> 8b 10 83 e2 03 40 f6 c6 03 0f 85 b2 01 00 00 48 09 f2 89 78 [1908184.656190] RIP [<ffffffff812882ee>] __blk_bios_map_sg+0x1de/0x400 [1908184.656190] RSP <ffff8801020ef890> [1908184.721263] ---[ end trace 965abd6d3708bdf5 ]--- [1908184.722772] BUG: unable to handle kernel paging request at ffffffffffffffd8 [1908184.723758] IP: [<ffffffff81089acc>] kthread_data+0xc/0x20 [1908184.724541] PGD 1816067 PUD 1818067 PMD 0
