[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.896189] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.793464] random: sshd: uninitialized urandom read (32 bytes read) [ 23.157912] random: sshd: uninitialized urandom read (32 bytes read) [ 23.870697] random: sshd: uninitialized urandom read (32 bytes read) [ 24.029509] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.35' (ECDSA) to the list of known hosts. [ 29.488217] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.577669] FAULT_INJECTION: forcing a failure. [ 29.577669] name failslab, interval 1, probability 0, space 0, times 1 [ 29.588887] CPU: 0 PID: 4453 Comm: syz-executor483 Not tainted 4.18.0-rc3-next-20180706+ #1 [ 29.597363] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.606702] Call Trace: [ 29.610788] dump_stack+0x1c9/0x2b4 [ 29.614427] ? dump_stack_print_info.cold.2+0x52/0x52 [ 29.619617] should_fail.cold.4+0xa/0x11 [ 29.623670] ? fault_create_debugfs_attr+0x1f0/0x1f0 [ 29.628768] ? save_stack+0xa9/0xd0 [ 29.632384] ? kasan_kmalloc+0xc4/0xe0 [ 29.636267] ? kasan_slab_alloc+0x12/0x20 [ 29.640395] ? kmem_cache_alloc+0x12e/0x760 [ 29.644710] ? xas_alloc+0x38a/0x490 [ 29.648407] ? xas_create+0x3ae/0x1150 [ 29.652281] ? xas_store+0xce/0x1720 [ 29.655989] ? shmem_add_to_page_cache+0x98e/0x1450 [ 29.661010] ? shmem_write_begin+0x10a/0x1e0 [ 29.665400] ? generic_perform_write+0x3ae/0x6c0 [ 29.670309] ? __generic_file_write_iter+0x26e/0x630 [ 29.675394] ? generic_file_write_iter+0x438/0x870 [ 29.680305] ? __vfs_write+0x6c6/0x9f0 [ 29.684170] ? vfs_write+0x1fc/0x560 [ 29.687863] ? ksys_pwrite64+0x181/0x1b0 [ 29.692338] ? __x64_sys_pwrite64+0x97/0xf0 [ 29.696652] ? do_syscall_64+0x1b9/0x820 [ 29.700695] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 29.706045] ? trace_hardirqs_on+0x10/0x10 [ 29.710261] ? kasan_alloc_pages+0x38/0x40 [ 29.714484] ? get_page_from_freelist+0xfe4/0x4620 [ 29.719399] ? rcu_cleanup_dead_rnp+0x200/0x200 [ 29.724058] ? trace_hardirqs_on+0x10/0x10 [ 29.728286] ? unwind_get_return_address+0x61/0xa0 [ 29.733202] ? kasan_unpoison_shadow+0x35/0x50 [ 29.737776] __should_failslab+0x124/0x180 [ 29.741998] should_failslab+0x9/0x14 [ 29.745784] kmem_cache_alloc+0x47/0x760 [ 29.749826] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 29.755358] ? xas_descend+0x20c/0x5f0 [ 29.759227] xas_alloc+0x38a/0x490 [ 29.762751] ? minmax_running_min+0x690/0x690 [ 29.767230] xas_create+0x3ae/0x1150 [ 29.771013] ? fs_reclaim_acquire+0x20/0x20 [ 29.775317] ? xas_descend+0x5f0/0x5f0 [ 29.779183] ? rcu_note_context_switch+0x730/0x730 [ 29.784103] ? __alloc_pages_nodemask+0x6e3/0xdb0 [ 29.788931] ? kasan_check_read+0x11/0x20 [ 29.793062] ? rcu_is_watching+0x8c/0x150 [ 29.797207] xas_store+0xce/0x1720 [ 29.800731] ? xas_find_tagged+0x1440/0x1440 [ 29.805123] ? lock_acquire+0x1e4/0x540 [ 29.809080] ? shmem_add_to_page_cache+0x8b9/0x1450 [ 29.814077] ? xa_find_after+0x9a0/0x9a0 [ 29.818118] ? xas_find_conflict+0x360/0x8d0 [ 29.822509] ? kasan_check_write+0x14/0x20 [ 29.826736] ? do_raw_spin_lock+0xc1/0x200 [ 29.830953] shmem_add_to_page_cache+0x98e/0x1450 [ 29.835826] ? shmem_write_end+0x9a0/0x9a0 [ 29.840070] ? mem_cgroup_try_charge+0x4ff/0xa70 [ 29.844818] ? mem_cgroup_protected+0xa60/0xa60 [ 29.849481] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 29.855002] ? shmem_alloc_and_acct_page+0x31a/0x820 [ 29.860095] ? shmem_getattr+0x2c0/0x2c0 [ 29.864152] ? lock_acquire+0x1e4/0x540 [ 29.868116] ? __wake_up_common_lock+0x1d0/0x330 [ 29.872857] shmem_getpage_gfp+0xaad/0x3ec0 [ 29.877171] ? shmem_writepage+0x13a0/0x13a0 [ 29.881560] ? __wake_up_common+0x740/0x740 [ 29.885879] ? __lockdep_init_map+0x105/0x590 [ 29.890366] ? lockdep_init_map+0x9/0x10 [ 29.894417] ? trace_hardirqs_on+0x10/0x10 [ 29.898634] ? trace_hardirqs_on+0x10/0x10 [ 29.902855] ? trace_hardirqs_on+0x10/0x10 [ 29.907087] ? trace_hardirqs_on+0x10/0x10 [ 29.911305] ? kasan_check_write+0x14/0x20 [ 29.915933] ? lock_downgrade+0x8f0/0x8f0 [ 29.920070] ? trace_hardirqs_on+0x10/0x10 [ 29.924290] ? d_instantiate_anon+0x30/0x30 [ 29.928594] ? trace_hardirqs_on+0x10/0x10 [ 29.932816] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 29.937380] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 29.942376] ? bpf_prog_kallsyms_find+0xde/0x4c0 [ 29.947115] ? lock_acquire+0x1e4/0x540 [ 29.951067] ? is_bpf_text_address+0xae/0x170 [ 29.955541] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 29.960537] ? bpf_prog_kallsyms_find+0xde/0x4c0 [ 29.965282] ? trace_hardirqs_on+0x10/0x10 [ 29.969500] ? lock_downgrade+0x8f0/0x8f0 [ 29.973633] ? trace_hardirqs_on+0x10/0x10 [ 29.977854] ? lock_acquire+0x1e4/0x540 [ 29.981813] ? simple_xattr_get+0x106/0x180 [ 29.986123] ? current_time+0x72/0x1b0 [ 29.989992] ? lock_downgrade+0x8f0/0x8f0 [ 29.994165] ? kasan_check_read+0x11/0x20 [ 29.998299] ? lock_release+0xa30/0xa30 [ 30.002267] ? kasan_check_write+0x14/0x20 [ 30.006484] ? do_raw_spin_lock+0xc1/0x200 [ 30.010701] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 30.016226] ? iov_iter_fault_in_readable+0x23d/0x460 [ 30.021496] ? copy_page_from_iter+0x890/0x890 [ 30.026058] ? __sanitizer_cov_trace_cmp8+0x3/0x20 [ 30.030967] ? ktime_get_coarse_real_ts64+0x243/0x3a0 [ 30.036142] shmem_write_begin+0x10a/0x1e0 [ 30.040365] generic_perform_write+0x3ae/0x6c0 [ 30.044942] ? add_page_wait_queue+0x2c0/0x2c0 [ 30.049510] ? file_update_time+0xe4/0x640 [ 30.053751] ? current_time+0x1b0/0x1b0 [ 30.057721] ? down_write+0x8f/0x130 [ 30.061425] __generic_file_write_iter+0x26e/0x630 [ 30.066336] ? timespec64_trunc+0xea/0x180 [ 30.070554] generic_file_write_iter+0x438/0x870 [ 30.075293] ? __generic_file_write_iter+0x630/0x630 [ 30.080379] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 30.085904] ? iov_iter_init+0xc9/0x1f0 [ 30.089858] __vfs_write+0x6c6/0x9f0 [ 30.093568] ? kernel_read+0x120/0x120 [ 30.097460] ? lock_release+0xa30/0xa30 [ 30.101425] ? check_same_owner+0x340/0x340 [ 30.105822] ? __fget_light+0x2f7/0x440 [ 30.109777] ? fget_raw+0x20/0x20 [ 30.113217] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.118735] ? __sb_start_write+0x17f/0x300 [ 30.123044] vfs_write+0x1fc/0x560 [ 30.126583] ksys_pwrite64+0x181/0x1b0 [ 30.130458] ? __ia32_sys_pread64+0xf0/0xf0 [ 30.134762] ? __sb_end_write+0xac/0xe0 [ 30.138720] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.144242] ? do_sys_ftruncate+0x44e/0x560 [ 30.148547] __x64_sys_pwrite64+0x97/0xf0 [ 30.152690] do_syscall_64+0x1b9/0x820 [ 30.156558] ? syscall_return_slowpath+0x5e0/0x5e0 [ 30.161482] ? syscall_return_slowpath+0x31d/0x5e0 [ 30.166410] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 30.171420] ? prepare_exit_to_usermode+0x291/0x3b0 [ 30.176419] ? perf_trace_sys_enter+0xb10/0xb10 [ 30.181070] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.185898] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.191069] RIP: 0033:0x4013d3 [ 30.194238] Code: ff 0f 83 d0 09 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 83 3d bd 59 2d 00 00 75 17 49 89 ca b8 12 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 a1 09 00 00 c3 48 83 ec 08 e8 57 00 00 00 [ 30.213378] RSP: 002b:00007fffe0c66938 EFLAGS: 00000246 ORIG_RAX: 0000000000000012 [ 30.221092] RAX: ffffffffffffffda RBX: 00000000200028c0 RCX: 00000000004013d3 [ 30.228344] RDX: 0000000000000f7c RSI: 0000000020001880 RDI: 0000000000000005 [ 30.235606] RBP: 0000000000000003 R08: 00000000200028c8 R09: 0000000020000480 [ 30.242868] R10: 0000000007f201df R11: 0000000000000246 R12: 0000000000000005 [ 30.250135] R13: 0000000000000005 R14: 0000000000290000 R15: 0000000000000002 [ 30.264384] page:ffffea0006d55040 count:2 mapcount:1 mapping:ffff8801ad9a6dd9 index:0xc9 [ 30.272758] flags: 0x2fffc0000040068(uptodate|lru|active|swapbacked) [ 30.279309] raw: 02fffc0000040068 ffffea0006d526c8 ffffea0006d5df48 ffff8801ad9a6dd9 [ 30.287218] raw: 00000000000000c9 0000000000000000 0000000200000000 ffff8801d9a44c80 [ 30.295234] page dumped because: VM_BUG_ON_PAGE(page_to_pgoff(page) != index) [ 30.302522] page->mem_cgroup:ffff8801d9a44c80 [ 30.307158] ------------[ cut here ]------------ [ 30.311897] kernel BUG at mm/shmem.c:815! [ 30.316084] invalid opcode: 0000 [#1] SMP KASAN [ 30.320758] CPU: 1 PID: 4453 Comm: syz-executor483 Not tainted 4.18.0-rc3-next-20180706+ #1 [ 30.329226] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.338570] RIP: 0010:shmem_undo_range+0xdaa/0x29a0 [ 30.343560] Code: 00 0f 85 bd 19 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 a5 f0 d6 ff 48 c7 c6 e0 32 f1 87 4c 89 e7 e8 16 10 05 00 <0f> 0b e8 8f f0 d6 ff 49 8d 7c 24 20 48 89 f8 48 c1 e8 03 80 3c 18 [ 30.362683] RSP: 0018:ffff8801c499eb80 EFLAGS: 00010246 [ 30.368035] RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000 [ 30.375300] RDX: 0000000000000000 RSI: ffffffff81aaab95 RDI: ffffed0038933d60 [ 30.382552] RBP: ffff8801c499f2f8 R08: ffff8801ad378580 R09: ffffed003b5e4fc0 [ 30.389819] R10: ffffed003b5e4fc0 R11: ffff8801daf27e07 R12: ffffea0006d55040 [ 30.397074] R13: ffff8801c499f2d0 R14: 0000000000000000 R15: 00000000000000c9 [ 30.404329] FS: 0000000000b31880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 30.412534] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.418395] CR2: 00007fbdf3ce3518 CR3: 00000001b7043000 CR4: 00000000001406e0 [ 30.425675] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.432930] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.440199] Call Trace: [ 30.442787] ? shmem_get_link+0x690/0x690 [ 30.446920] ? free_unref_page_commit.isra.87+0x610/0x610 [ 30.452442] ? rb_erase+0x3550/0x3550 [ 30.456228] ? trace_hardirqs_on+0x10/0x10 [ 30.460448] ? rb_erase+0x3550/0x3550 [ 30.464237] ? lock_release+0xa30/0xa30 [ 30.468205] ? lock_acquire+0x1e4/0x540 [ 30.472171] ? lock_downgrade+0x8f0/0x8f0 [ 30.476304] ? lock_release+0xa30/0xa30 [ 30.480268] ? lock_acquire+0x1e4/0x540 [ 30.484246] ? trace_hardirqs_on+0x10/0x10 [ 30.488472] ? lock_release+0xa30/0xa30 [ 30.492433] ? trace_hardirqs_on+0x10/0x10 [ 30.496661] ? cpuacct_css_alloc+0x160/0x160 [ 30.501061] ? account_entity_dequeue+0x800/0x800 [ 30.505893] ? __account_cfs_rq_runtime+0x770/0x770 [ 30.510898] ? update_curr+0x4e7/0xc00 [ 30.514771] ? __account_cfs_rq_runtime+0x770/0x770 [ 30.519774] ? set_next_entity+0x2eb/0xc70 [ 30.524008] ? lock_downgrade+0x8f0/0x8f0 [ 30.528249] ? active_load_balance_cpu_stop+0x1030/0x1030 [ 30.533774] ? __enqueue_entity+0x10d/0x1f0 [ 30.538082] ? pick_next_task_fair+0x997/0x17a0 [ 30.542735] ? enqueue_entity+0x34b/0x2130 [ 30.546965] ? trace_hardirqs_on+0x10/0x10 [ 30.551184] ? trace_hardirqs_on+0x10/0x10 [ 30.555497] ? trace_hardirqs_on+0x10/0x10 [ 30.559727] ? __free_pages+0x149/0x190 [ 30.563690] ? free_unref_page+0x9a0/0x9a0 [ 30.567910] ? trace_hardirqs_on+0x10/0x10 [ 30.572154] ? trace_hardirqs_on+0x10/0x10 [ 30.576381] shmem_truncate_range+0x27/0xa0 [ 30.580690] shmem_evict_inode+0x3b2/0xcb0 [ 30.584925] ? kasan_check_write+0x14/0x20 [ 30.589147] ? shmem_truncate_range+0xa0/0xa0 [ 30.593630] ? trace_hardirqs_on+0x10/0x10 [ 30.597877] ? lock_acquire+0x1e4/0x540 [ 30.601841] ? inode_wait_for_writeback+0x2f/0x40 [ 30.606687] ? lock_downgrade+0x8f0/0x8f0 [ 30.610835] ? evict+0x468/0x990 [ 30.614196] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 30.619729] ? __inode_wait_for_writeback+0x2cf/0x380 [ 30.624915] ? kasan_check_read+0x11/0x20 [ 30.629057] ? do_raw_spin_unlock+0xa7/0x2f0 [ 30.633456] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 30.638044] ? kasan_check_write+0x14/0x20 [ 30.642271] ? do_raw_spin_lock+0xc1/0x200 [ 30.646498] ? shmem_truncate_range+0xa0/0xa0 [ 30.650995] evict+0x4ae/0x990 [ 30.654184] ? destroy_inode+0x200/0x200 [ 30.658235] ? do_raw_spin_lock+0xc1/0x200 [ 30.662544] ? lock_downgrade+0x8f0/0x8f0 [ 30.666683] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 30.672218] ? kasan_check_read+0x11/0x20 [ 30.676385] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 30.680961] iput+0x635/0xaa0 [ 30.684054] ? fsnotify_final_mark_destroy+0xc0/0xc0 [ 30.689160] ? inode_add_lru+0x2a0/0x2a0 [ 30.693222] ? fsnotify_destroy_marks+0x2e7/0x5c0 [ 30.698063] ? kasan_check_read+0x11/0x20 [ 30.702214] ? do_raw_spin_unlock+0xa7/0x2f0 [ 30.706619] ? fsnotify_clear_marks_by_group+0x640/0x640 [ 30.712068] ? lock_downgrade+0x8f0/0x8f0 [ 30.716217] dentry_unlink_inode+0x4ae/0x640 [ 30.720614] ? d_lru_add+0x120/0x120 [ 30.724316] ? kasan_check_write+0x14/0x20 [ 30.728537] ? do_raw_spin_lock+0xc1/0x200 [ 30.732771] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.738295] ? lockref_mark_dead+0xef/0x170 [ 30.742604] ? lockref_get_not_dead+0x90/0x90 [ 30.747092] ? lock_acquire+0x1e4/0x540 [ 30.751062] __dentry_kill+0x44c/0x7a0 [ 30.754944] ? d_drop+0x70/0x70 [ 30.758213] ? do_raw_spin_lock+0x200/0x200 [ 30.762524] ? lock_release+0xa30/0xa30 [ 30.766485] ? check_same_owner+0x340/0x340 [ 30.770854] dentry_kill+0xc9/0x5a0 [ 30.774472] dput.part.26+0x66b/0x7a0 [ 30.778261] ? shrink_dcache_sb+0x350/0x350 [ 30.782589] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 30.787595] dput+0x15/0x20 [ 30.790513] __fput+0x558/0x930 [ 30.793779] ? fput+0x1a0/0x1a0 [ 30.797055] ? kasan_check_write+0x14/0x20 [ 30.801279] ? do_raw_spin_lock+0xc1/0x200 [ 30.805515] ____fput+0x15/0x20 [ 30.808782] task_work_run+0x1ec/0x2a0 [ 30.812658] ? task_work_cancel+0x250/0x250 [ 30.816973] ? copy_fd_bitmaps+0x210/0x210 [ 30.821196] exit_to_usermode_loop+0x313/0x370 [ 30.825773] ? syscall_slow_exit_work+0x500/0x500 [ 30.830602] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.836128] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.841651] do_syscall_64+0x6be/0x820 [ 30.845538] ? syscall_return_slowpath+0x5e0/0x5e0 [ 30.850456] ? syscall_return_slowpath+0x31d/0x5e0 [ 30.855374] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 30.860383] ? prepare_exit_to_usermode+0x291/0x3b0 [ 30.865385] ? perf_trace_sys_enter+0xb10/0xb10 [ 30.870045] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.874880] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.880059] RIP: 0033:0x401310 [ 30.883239] Code: 01 f0 ff ff 0f 83 90 0a 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 83 3d 7d 5a 2d 00 00 75 14 b8 03 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 64 0a 00 00 c3 48 83 ec 08 e8 1a 01 00 00 [ 30.902383] RSP: 002b:00007fffe0c66938 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 [ 30.910078] RAX: 0000000000000000 RBX: 00000000ffffffff RCX: 0000000000401310 [ 30.917333] RDX: 0000000000000000 RSI: 0000000000004c01 RDI: 0000000000000005 [ 30.924598] RBP: 0000000000000016 R08: 00007fffe0c669b0 R09: 000000000000000a [ 30.931857] R10: 0000000000290001 R11: 0000000000000246 R12: 0000000000000005 [ 30.939198] R13: 0000000000000006 R14: 0000000000290001 R15: 0000000000000003 [ 30.946454] Modules linked in: [ 30.949650] Dumping ftrace buffer: [ 30.953181] (ftrace buffer empty) [ 30.956978] ---[ end trace c744843e9ba93494 ]--- [ 30.961788] RIP: 0010:shmem_undo_range+0xdaa/0x29a0 [ 30.966850] Code: 00 0f 85 bd 19 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 a5 f0 d6 ff 48 c7 c6 e0 32 f1 87 4c 89 e7 e8 16 10 05 00 <0f> 0b e8 8f f0 d6 ff 49 8d 7c 24 20 48 89 f8 48 c1 e8 03 80 3c 18 [ 30.986182] RSP: 0018:ffff8801c499eb80 EFLAGS: 00010246 [ 30.991597] RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000 [ 30.998908] RDX: 0000000000000000 RSI: ffffffff81aaab95 RDI: ffffed0038933d60 [ 31.006199] RBP: ffff8801c499f2f8 R08: ffff8801ad378580 R09: ffffed003b5e4fc0 [ 31.013507] R10: ffffed003b5e4fc0 R11: ffff8801daf27e07 R12: ffffea0006d55040 [ 31.020820] R13: ffff8801c499f2d0 R14: 0000000000000000 R15: 00000000000000c9 [ 31.028292] FS: 0000000000b31880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 31.036542] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.042451] CR2: 00007fbdf3ce3518 CR3: 00000001b7043000 CR4: 00000000001406e0 [ 31.049778] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.057099] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.064407] Kernel panic - not syncing: Fatal exception [ 31.070348] Dumping ftrace buffer: [ 31.073882] (ftrace buffer empty) [ 31.077575] Kernel Offset: disabled [ 31.081239] Rebooting in 86400 seconds..