[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.985760] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 16.741590] random: sshd: uninitialized urandom read (32 bytes read) [ 16.986144] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 17.686342] random: sshd: uninitialized urandom read (32 bytes read) [ 31.168359] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.62' (ECDSA) to the list of known hosts. [ 36.600719] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program executing program executing program executing program executing program executing program [ 36.717062] 9pnet: Insufficient options for proto=fd [ 36.718182] 9pnet: Insufficient options for proto=fd [ 36.722481] 9pnet: Insufficient options for proto=fd [ 36.727694] 9pnet: Insufficient options for proto=fd [ 36.737988] 9pnet: Insufficient options for proto=fd [ 36.743408] 9pnet: Insufficient options for proto=fd [ 36.748919] 9pnet: Insufficient options for proto=fd executing program executing program executing program executing program executing program executing program [ 36.777758] 9pnet: Insufficient options for proto=fd [ 36.777896] 9pnet: Insufficient options for proto=fd [ 36.788587] 9pnet: Insufficient options for proto=fd [ 36.798314] 9pnet: Insufficient options for proto=fd [ 36.799250] 9pnet: Insufficient options for proto=fd [ 36.803813] 9pnet: Insufficient options for proto=fd [ 36.808988] 9pnet: Insufficient options for proto=fd [ 36.869554] 9pnet: Insufficient options for proto=fd [ 36.871726] 9pnet: Insufficient options for proto=fd [ 36.874999] 9pnet: Insufficient options for proto=fd [ 36.880084] 9pnet: Insufficient options for proto=fd [ 36.885466] 9pnet: Insufficient options for proto=fd executing program executing program executing program executing program executing program executing program [ 36.934701] 9pnet: Insufficient options for proto=fd [ 36.935009] 9pnet: Insufficient options for proto=fd [ 36.944995] 9pnet: Insufficient options for proto=fd [ 36.952742] 9pnet: Insufficient options for proto=fd [ 36.953343] 9pnet: Insufficient options for proto=fd [ 37.023178] 9pnet: Insufficient options for proto=fd [ 37.028627] 9pnet: Insufficient options for proto=fd [ 37.028638] 9pnet: Insufficient options for proto=fd [ 37.039482] 9pnet: Insufficient options for proto=fd [ 37.039506] 9pnet: Insufficient options for proto=fd executing program executing program executing program executing program executing program [ 37.083720] 9pnet: Insufficient options for proto=fd [ 37.089479] 9pnet: Insufficient options for proto=fd [ 37.093929] 9pnet: Insufficient options for proto=fd [ 37.101435] 9pnet: Insufficient options for proto=fd [ 37.107442] 9pnet: Insufficient options for proto=fd [ 37.177110] 9pnet: Insufficient options for proto=fd [ 37.182537] 9pnet: Insufficient options for proto=fd [ 37.182574] 9pnet: Insufficient options for proto=fd executing program executing program executing program [ 37.227615] 9pnet: Insufficient options for proto=fd [ 37.237663] 9pnet: Insufficient options for proto=fd [ 37.243645] 9pnet: Insufficient options for proto=fd [ 37.317821] 9pnet: Insufficient options for proto=fd [ 37.325388] 9pnet: Insufficient options for proto=fd [ 37.367723] 9pnet: Insufficient options for proto=fd [ 37.377485] 9pnet: Insufficient options for proto=fd [ 37.423217] FAULT_FLAG_ALLOW_RETRY missing 30 [ 37.427758] CPU: 1 PID: 4436 Comm: syz-executor864 Not tainted 4.18.0-rc6-next-20180725+ #18 [ 37.436309] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.445637] Call Trace: [ 37.448207] dump_stack+0x1c9/0x2b4 [ 37.451812] ? dump_stack_print_info.cold.2+0x52/0x52 [ 37.456977] ? kasan_check_write+0x14/0x20 [ 37.461188] ? do_raw_spin_lock+0xc1/0x200 [ 37.465404] handle_userfault.cold.33+0x47/0x62 [ 37.470050] ? userfaultfd_ioctl+0x5430/0x5430 [ 37.474609] ? trace_hardirqs_on+0x10/0x10 [ 37.478821] ? rb_next+0x140/0x140 [ 37.482338] ? rb_erase+0x3550/0x3550 [ 37.486113] ? save_stack+0x43/0xd0 [ 37.489714] ? __kasan_slab_free+0x11a/0x170 [ 37.494103] ? kasan_slab_free+0xe/0x10 [ 37.498052] ? kmem_cache_free+0x86/0x2d0 [ 37.502178] ? jbd2_journal_stop+0x449/0x15c0 [ 37.506648] ? __ext4_journal_stop+0xde/0x1f0 [ 37.511117] ? do_truncate+0x1ac/0x2b0 [ 37.514979] ? path_openat+0x33e2/0x5300 [ 37.519013] ? do_filp_open+0x255/0x380 [ 37.522960] ? do_sys_open+0x584/0x720 [ 37.526826] ? userfaultfd_ctx_put+0x810/0x810 [ 37.531384] ? cpuacct_charge+0x281/0x5d0 [ 37.535506] ? lock_downgrade+0x8f0/0x8f0 [ 37.539631] ? trace_hardirqs_on+0x10/0x10 [ 37.543853] ? lock_release+0xa30/0xa30 [ 37.547806] ? lock_acquire+0x1e4/0x540 [ 37.551756] ? update_curr+0x4c8/0xc00 [ 37.555620] ? lock_downgrade+0x8f0/0x8f0 [ 37.559747] ? lock_release+0xa30/0xa30 [ 37.563698] ? trace_hardirqs_on+0x10/0x10 [ 37.567927] ? lock_acquire+0x1e4/0x540 executing program [ 37.571878] ? __handle_mm_fault+0x3a11/0x4470 [ 37.576436] ? lock_downgrade+0x8f0/0x8f0 [ 37.580559] ? kasan_check_read+0x11/0x20 [ 37.584683] ? do_raw_spin_unlock+0xa7/0x2f0 [ 37.589064] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 37.593621] ? kasan_check_write+0x14/0x20 [ 37.597830] ? do_raw_spin_lock+0xc1/0x200 [ 37.602052] __handle_mm_fault+0x3a1e/0x4470 [ 37.606440] ? vmf_insert_mixed_mkwrite+0xa0/0xa0 [ 37.611256] ? lock_release+0xa30/0xa30 [ 37.615207] ? kasan_check_read+0x11/0x20 [ 37.619336] ? lock_acquire+0x1e4/0x540 [ 37.623287] ? handle_mm_fault+0x417/0xc80 [ 37.627498] ? lock_downgrade+0x8f0/0x8f0 [ 37.631623] ? lock_release+0xa30/0xa30 [ 37.635573] ? rcu_note_context_switch+0x730/0x730 [ 37.640476] ? mem_cgroup_from_task+0xcb/0x1f0 [ 37.645034] ? mem_cgroup_css_online+0x3c0/0x3c0 [ 37.649768] handle_mm_fault+0x53e/0xc80 [ 37.650261] 9pnet: Insufficient options for proto=fd [ 37.653806] ? __handle_mm_fault+0x4470/0x4470 [ 37.653814] ? find_vma+0x34/0x190 [ 37.653823] __do_page_fault+0x620/0xe50 [ 37.653832] ? mm_fault_error+0x380/0x380 [ 37.653838] ? kasan_check_read+0x11/0x20 [ 37.653844] ? rcu_is_watching+0x8c/0x150 [ 37.653852] do_page_fault+0xf6/0x8c0 [ 37.653860] ? vmalloc_sync_all+0x30/0x30 [ 37.653868] ? trace_hardirqs_on+0x10/0x10 [ 37.653875] ? trace_hardirqs_on+0x10/0x10 [ 37.653889] ? unwind_get_return_address+0x61/0xa0 [ 37.704650] ? __save_stack_trace+0x8d/0xf0 [ 37.708245] 9pnet: Insufficient options for proto=fd [ 37.708952] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 37.708961] page_fault+0x1e/0x30 [ 37.708971] RIP: 0010:iov_iter_fault_in_readable+0x1bf/0x460 [ 37.708980] Code: ff ff ff 76 17 eb 3f e8 df c3 1a fe 49 81 c4 00 10 00 00 4c 39 a5 30 ff ff ff 72 32 e8 ca c3 1a fe 0f 1f 00 0f ae e8 45 31 ed <41> 8a 14 24 0f 1f 00 31 ff 44 89 ee 88 95 58 ff ff ff e8 ba c4 1a [ 37.708991] RSP: 0018:ffff8801ad32f688 EFLAGS: 00010246 [ 37.752326] RAX: ffff8801acf34180 RBX: 1ffff10035a65ed3 RCX: ffffffff8361e403 [ 37.759571] RDX: 0000000000000000 RSI: ffffffff8361e436 RDI: 0000000000000005 [ 37.766817] RBP: ffff8801ad32f760 R08: ffff8801acf34180 R09: 0000000000000001 [ 37.774061] R10: ffff8801ad32fca0 R11: ffff8801ae643b47 R12: 0000000020011fd2 [ 37.781306] R13: 0000000000000000 R14: 0000000000000030 R15: ffff8801ad32fbc8 [ 37.788559] ? iov_iter_fault_in_readable+0x183/0x460 [ 37.793724] ? iov_iter_fault_in_readable+0x1b6/0x460 [ 37.798891] ? iov_iter_fault_in_readable+0x1b6/0x460 [ 37.804058] ? copy_page_from_iter+0x890/0x890 [ 37.808618] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 37.813611] ? ktime_get_coarse_real_ts64+0x243/0x3a0 [ 37.818777] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 37.824290] ? timespec64_trunc+0xea/0x180 [ 37.828501] ? inode_init_owner+0x340/0x340 [ 37.832805] generic_perform_write+0x21b/0x6c0 [ 37.837366] ? add_page_wait_queue+0x2c0/0x2c0 [ 37.841921] ? file_update_time+0xe4/0x640 [ 37.846129] ? current_time+0x1b0/0x1b0 [ 37.850093] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 37.855086] ? generic_write_checks+0x385/0x5d0 [ 37.859730] ? page_endio+0x630/0x630 [ 37.863507] ? ext4_file_write_iter+0x2a1/0x1450 [ 37.868238] __generic_file_write_iter+0x26e/0x630 [ 37.873145] ext4_file_write_iter+0x390/0x1450 [ 37.877702] ? fpstate_init+0xc0/0x160 [ 37.881569] ? ext4_file_mmap+0x410/0x410 [ 37.885694] ? __fget+0x4d5/0x740 [ 37.889127] ? ksys_dup3+0x690/0x690 [ 37.892820] ? lock_acquire+0x1e4/0x540 [ 37.896770] ? __might_fault+0x12b/0x1e0 [ 37.900806] ? lock_downgrade+0x8f0/0x8f0 [ 37.904933] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 37.909933] ? __set_current_blocked+0xe4/0x120 [ 37.914577] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 37.920087] ? iov_iter_init+0xc9/0x1f0 [ 37.924040] __vfs_write+0x6af/0x9d0 [ 37.927738] ? kernel_read+0x120/0x120 [ 37.931602] ? lock_release+0xa30/0xa30 [ 37.935555] ? check_same_owner+0x340/0x340 [ 37.939917] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 37.945494] ? __sb_start_write+0x17f/0x300 [ 37.949795] vfs_write+0x1fc/0x560 [ 37.953326] ksys_write+0x101/0x260 [ 37.956930] ? __ia32_sys_read+0xb0/0xb0 [ 37.960988] ? syscall_slow_exit_work+0x500/0x500 [ 37.965808] __x64_sys_write+0x73/0xb0 [ 37.969672] do_syscall_64+0x1b9/0x820 [ 37.973536] ? syscall_slow_exit_work+0x500/0x500 [ 37.978366] ? syscall_return_slowpath+0x5e0/0x5e0 [ 37.983274] ? syscall_return_slowpath+0x31d/0x5e0 [ 37.988192] ? prepare_exit_to_usermode+0x291/0x3b0 [ 37.993195] ? perf_trace_sys_enter+0xb10/0xb10 [ 37.997842] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 38.002665] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 38.007831] RIP: 0033:0x446689 [ 38.011047] Code: e8 ac e7 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 0d fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 38.029928] RSP: 002b:00007fc1cd74cce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 38.037612] RAX: ffffffffffffffda RBX: 00000000006dbc48 RCX: 0000000000446689 [ 38.044858] RDX: 0000000000000030 RSI: 0000000020011fd2 RDI: 0000000000000004 [ 38.052104] RBP: 00000000006dbc40 R08: 00000000006dbc40 R09: 0000000000000000 [ 38.059349] R10: 00007fc1cd74ccf0 R11: 0000000000000246 R12: 00000000006dbc4c [ 38.066608] R13: 00007fffabd5ea5f R14: 00007fc1cd74d9c0 R15: 00000000006dbd4c [ 38.078415] ================================================================== [ 38.085810] BUG: KASAN: use-after-free in iov_iter_copy_from_user_atomic+0xb8d/0xfa0 [ 38.093679] Read of size 21 at addr ffff8801ad780d60 by task kworker/0:1/13 [ 38.100755] [ 38.102372] CPU: 0 PID: 13 Comm: kworker/0:1 Not tainted 4.18.0-rc6-next-20180725+ #18 [ 38.110405] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.119762] Workqueue: events p9_write_work [ 38.124070] Call Trace: [ 38.126645] dump_stack+0x1c9/0x2b4 [ 38.130256] ? dump_stack_print_info.cold.2+0x52/0x52 [ 38.135428] ? printk+0xa7/0xcf [ 38.138687] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 38.143427] ? iov_iter_copy_from_user_atomic+0xb8d/0xfa0 [ 38.148950] print_address_description+0x6c/0x20b [ 38.153786] ? iov_iter_copy_from_user_atomic+0xb8d/0xfa0 [ 38.159312] kasan_report.cold.7+0x242/0x30d [ 38.163703] check_memory_region+0x13e/0x1b0 [ 38.168103] memcpy+0x23/0x50 [ 38.171206] iov_iter_copy_from_user_atomic+0xb8d/0xfa0 [ 38.176552] ? iov_iter_advance+0x2ec/0x14e0 [ 38.180952] ? csum_and_copy_from_iter_full+0x10b0/0x10b0 [ 38.186477] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 38.191492] ? ktime_get_coarse_real_ts64+0x243/0x3a0 [ 38.196665] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.202207] ? timespec64_trunc+0xea/0x180 [ 38.206437] ? inode_init_owner+0x340/0x340 [ 38.210745] generic_perform_write+0x469/0x6c0 [ 38.215313] ? generic_update_time+0x26a/0x450 [ 38.219887] ? add_page_wait_queue+0x2c0/0x2c0 [ 38.224463] ? current_time+0x1b0/0x1b0 [ 38.228432] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 38.233430] ? generic_write_checks+0x385/0x5d0 [ 38.238080] ? page_endio+0x630/0x630 [ 38.241870] ? down_write+0xaa/0x130 [ 38.245569] __generic_file_write_iter+0x26e/0x630 [ 38.250482] ext4_file_write_iter+0x390/0x1450 [ 38.255046] ? trace_hardirqs_on+0x10/0x10 [ 38.259277] ? lock_acquire+0x1e4/0x540 [ 38.263231] ? update_curr+0x4c8/0xc00 [ 38.267099] ? ext4_file_mmap+0x410/0x410 [ 38.271225] ? lock_release+0xa30/0xa30 [ 38.275181] ? trace_hardirqs_on+0x10/0x10 [ 38.279398] ? cpuacct_css_alloc+0x160/0x160 [ 38.283799] ? trace_hardirqs_on+0x10/0x10 [ 38.288030] ? update_curr+0x4e7/0xc00 [ 38.291904] ? kasan_check_write+0x14/0x20 [ 38.296132] ? trace_hardirqs_on+0x10/0x10 [ 38.300353] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 38.305874] ? iov_iter_init+0xc9/0x1f0 [ 38.309835] __vfs_write+0x6af/0x9d0 [ 38.313534] ? kernel_read+0x120/0x120 [ 38.317401] ? lock_release+0xa30/0xa30 [ 38.321355] ? check_same_owner+0x340/0x340 [ 38.325662] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.331182] ? __sb_start_write+0x17f/0x300 [ 38.335490] vfs_write+0x1fc/0x560 [ 38.339014] kernel_write+0xab/0x120 [ 38.342711] p9_write_work+0x6f1/0xd50 [ 38.346579] ? p9_fd_create_tcp+0x8a0/0x8a0 [ 38.350890] ? lock_acquire+0x1e4/0x540 [ 38.354854] ? process_one_work+0xb9b/0x1ba0 [ 38.359247] ? kasan_check_read+0x11/0x20 [ 38.363377] ? lock_release+0xa30/0xa30 [ 38.367330] ? kasan_check_read+0x11/0x20 [ 38.371460] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 38.376023] ? read_word_at_a_time+0x20/0x20 [ 38.380415] ? compat_start_thread+0x80/0x80 [ 38.384814] process_one_work+0xc73/0x1ba0 [ 38.389045] ? trace_hardirqs_on+0x10/0x10 [ 38.393278] ? pwq_dec_nr_in_flight+0x4a0/0x4a0 [ 38.397939] ? lock_repin_lock+0x430/0x430 [ 38.402165] ? __sched_text_start+0x8/0x8 [ 38.406299] ? lock_downgrade+0x8f0/0x8f0 [ 38.410427] ? graph_lock+0x170/0x170 [ 38.414215] ? graph_lock+0x170/0x170 [ 38.418009] ? lock_acquire+0x1e4/0x540 [ 38.421964] ? worker_thread+0x3dc/0x13c0 [ 38.426090] ? lock_downgrade+0x8f0/0x8f0 [ 38.430216] ? lock_release+0xa30/0xa30 [ 38.434171] ? kasan_check_read+0x11/0x20 [ 38.438303] ? do_raw_spin_unlock+0xa7/0x2f0 [ 38.442692] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 38.447253] ? kasan_check_write+0x14/0x20 [ 38.451469] ? do_raw_spin_lock+0xc1/0x200 [ 38.455684] worker_thread+0x189/0x13c0 [ 38.459641] ? process_one_work+0x1ba0/0x1ba0 [ 38.464119] ? graph_lock+0x170/0x170 [ 38.467902] ? graph_lock+0x170/0x170 [ 38.471682] ? find_held_lock+0x36/0x1c0 [ 38.475726] ? find_held_lock+0x36/0x1c0 [ 38.479782] ? lock_downgrade+0x8f0/0x8f0 [ 38.483917] ? kasan_check_read+0x11/0x20 [ 38.488045] ? do_raw_spin_unlock+0xa7/0x2f0 [ 38.492437] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 38.497521] ? __kthread_parkme+0x58/0x1b0 [ 38.501738] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 38.506744] ? trace_hardirqs_on+0xd/0x10 [ 38.510880] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 38.516397] ? __kthread_parkme+0x106/0x1b0 [ 38.520701] kthread+0x345/0x410 [ 38.524048] ? process_one_work+0x1ba0/0x1ba0 [ 38.528524] ? kthread_bind+0x40/0x40 [ 38.532304] ret_from_fork+0x3a/0x50 [ 38.535995] [ 38.537602] Allocated by task 4438: [ 38.541210] save_stack+0x43/0xd0 [ 38.544642] kasan_kmalloc+0xc4/0xe0 [ 38.548337] __kmalloc+0x14e/0x760 [ 38.551858] p9_fcall_alloc+0x1e/0x90 [ 38.555638] p9_client_prepare_req.part.8+0x107/0xa00 [ 38.560814] p9_client_rpc+0x247/0x1420 [ 38.564779] p9_client_create+0xd76/0x1631 [ 38.569000] v9fs_session_init+0x21a/0x1a80 [ 38.573301] v9fs_mount+0x7c/0x900 [ 38.576826] legacy_get_tree+0x131/0x460 [ 38.580875] vfs_get_tree+0x1cb/0x5c0 [ 38.584657] do_mount+0x6f2/0x1e20 [ 38.588182] ksys_mount+0x12d/0x140 [ 38.591793] __x64_sys_mount+0xbe/0x150 [ 38.595761] do_syscall_64+0x1b9/0x820 [ 38.599637] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 38.604804] [ 38.606417] Freed by task 4438: [ 38.609677] save_stack+0x43/0xd0 [ 38.613109] __kasan_slab_free+0x11a/0x170 [ 38.617323] kasan_slab_free+0xe/0x10 [ 38.621106] kfree+0xd9/0x260 [ 38.624193] p9_free_req+0xb5/0x120 [ 38.627808] p9_client_rpc+0xb20/0x1420 [ 38.631770] p9_client_create+0xd76/0x1631 [ 38.635992] v9fs_session_init+0x21a/0x1a80 [ 38.640297] v9fs_mount+0x7c/0x900 [ 38.643825] legacy_get_tree+0x131/0x460 [ 38.647879] vfs_get_tree+0x1cb/0x5c0 [ 38.651668] do_mount+0x6f2/0x1e20 [ 38.655187] ksys_mount+0x12d/0x140 [ 38.658802] __x64_sys_mount+0xbe/0x150 [ 38.662769] do_syscall_64+0x1b9/0x820 [ 38.666644] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 38.671806] [ 38.673415] The buggy address belongs to the object at ffff8801ad780d40 [ 38.673415] which belongs to the cache kmalloc-16384 of size 16384 [ 38.686402] The buggy address is located 32 bytes inside of [ 38.686402] 16384-byte region [ffff8801ad780d40, ffff8801ad784d40) [ 38.698342] The buggy address belongs to the page: [ 38.703257] page:ffffea0006b5e000 count:1 mapcount:0 mapping:ffff8801dac02200 index:0x0 compound_mapcount: 0 [ 38.713212] flags: 0x2fffc0000008100(slab|head) [ 38.717870] raw: 02fffc0000008100 ffffea00072e3008 ffffea0006c75408 ffff8801dac02200 [ 38.725745] raw: 0000000000000000 ffff8801ad780d40 0000000100000001 0000000000000000 [ 38.733607] page dumped because: kasan: bad access detected [ 38.739293] [ 38.740901] Memory state around the buggy address: [ 38.745822] ffff8801ad780c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 38.753170] ffff8801ad780c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 38.760511] >ffff8801ad780d00: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 38.767850] ^ [ 38.774342] ffff8801ad780d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb executing program executing program [ 38.781682] ffff8801ad780e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 38.789018] ================================================================== [ 38.796473] Kernel panic - not syncing: panic_on_warn set ... [ 38.796473] [ 38.803835] CPU: 0 PID: 13 Comm: kworker/0:1 Tainted: G B 4.18.0-rc6-next-20180725+ #18 [ 38.813262] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.822608] Workqueue: events p9_write_work [ 38.826910] Call Trace: [ 38.829495] dump_stack+0x1c9/0x2b4 [ 38.833105] ? dump_stack_print_info.cold.2+0x52/0x52 [ 38.838210] 9pnet: Insufficient options for proto=fd [ 38.838282] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 38.843737] 9pnet: Insufficient options for proto=fd [ 38.848136] panic+0x238/0x4e7 [ 38.848149] ? add_taint.cold.5+0x16/0x16 [ 38.848159] ? do_raw_spin_unlock+0xa7/0x2f0 [ 38.848170] ? do_raw_spin_unlock+0xa7/0x2f0 [ 38.869326] ? iov_iter_copy_from_user_atomic+0xb8d/0xfa0 [ 38.874853] kasan_end_report+0x47/0x4f [ 38.878822] kasan_report.cold.7+0x76/0x30d [ 38.883126] check_memory_region+0x13e/0x1b0 [ 38.887534] memcpy+0x23/0x50 [ 38.888904] 9pnet: Insufficient options for proto=fd [ 38.890623] iov_iter_copy_from_user_atomic+0xb8d/0xfa0 [ 38.890630] ? iov_iter_advance+0x2ec/0x14e0 [ 38.890640] ? csum_and_copy_from_iter_full+0x10b0/0x10b0 [ 38.890650] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 38.890667] ? ktime_get_coarse_real_ts64+0x243/0x3a0 [ 38.900799] 9pnet: Insufficient options for proto=fd [ 38.901153] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.931805] ? timespec64_trunc+0xea/0x180 [ 38.936028] ? inode_init_owner+0x340/0x340 [ 38.940332] generic_perform_write+0x469/0x6c0 [ 38.944898] ? generic_update_time+0x26a/0x450 [ 38.949472] ? add_page_wait_queue+0x2c0/0x2c0 [ 38.954033] ? current_time+0x1b0/0x1b0 [ 38.957989] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 38.962992] ? generic_write_checks+0x385/0x5d0 [ 38.967648] ? page_endio+0x630/0x630 [ 38.971434] ? down_write+0xaa/0x130 [ 38.975134] __generic_file_write_iter+0x26e/0x630 [ 38.980059] ext4_file_write_iter+0x390/0x1450 [ 38.984626] ? trace_hardirqs_on+0x10/0x10 [ 38.988850] ? lock_acquire+0x1e4/0x540 [ 38.992815] ? update_curr+0x4c8/0xc00 [ 38.996697] ? ext4_file_mmap+0x410/0x410 [ 39.000837] ? lock_release+0xa30/0xa30 [ 39.004806] ? trace_hardirqs_on+0x10/0x10 [ 39.009027] ? cpuacct_css_alloc+0x160/0x160 [ 39.013417] ? trace_hardirqs_on+0x10/0x10 [ 39.017632] ? update_curr+0x4e7/0xc00 [ 39.021498] ? kasan_check_write+0x14/0x20 [ 39.025724] ? trace_hardirqs_on+0x10/0x10 [ 39.029946] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 39.035461] ? iov_iter_init+0xc9/0x1f0 [ 39.039418] __vfs_write+0x6af/0x9d0 [ 39.043114] ? kernel_read+0x120/0x120 [ 39.046985] ? lock_release+0xa30/0xa30 [ 39.050938] ? check_same_owner+0x340/0x340 [ 39.055244] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.060768] ? __sb_start_write+0x17f/0x300 [ 39.065096] vfs_write+0x1fc/0x560 [ 39.068631] kernel_write+0xab/0x120 [ 39.072330] p9_write_work+0x6f1/0xd50 [ 39.076198] ? p9_fd_create_tcp+0x8a0/0x8a0 [ 39.080501] ? lock_acquire+0x1e4/0x540 [ 39.084456] ? process_one_work+0xb9b/0x1ba0 [ 39.088889] ? kasan_check_read+0x11/0x20 [ 39.093027] ? lock_release+0xa30/0xa30 [ 39.096980] ? kasan_check_read+0x11/0x20 [ 39.101107] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 39.105670] ? read_word_at_a_time+0x20/0x20 [ 39.110061] ? compat_start_thread+0x80/0x80 [ 39.114466] process_one_work+0xc73/0x1ba0 [ 39.118694] ? trace_hardirqs_on+0x10/0x10 [ 39.122934] ? pwq_dec_nr_in_flight+0x4a0/0x4a0 [ 39.127590] ? lock_repin_lock+0x430/0x430 [ 39.131831] ? __sched_text_start+0x8/0x8 [ 39.135961] ? lock_downgrade+0x8f0/0x8f0 [ 39.140088] ? graph_lock+0x170/0x170 [ 39.143867] ? graph_lock+0x170/0x170 [ 39.147656] ? lock_acquire+0x1e4/0x540 [ 39.151613] ? worker_thread+0x3dc/0x13c0 [ 39.155748] ? lock_downgrade+0x8f0/0x8f0 [ 39.159880] ? lock_release+0xa30/0xa30 [ 39.163850] ? kasan_check_read+0x11/0x20 [ 39.167976] ? do_raw_spin_unlock+0xa7/0x2f0 [ 39.172362] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 39.176921] ? kasan_check_write+0x14/0x20 [ 39.181133] ? do_raw_spin_lock+0xc1/0x200 [ 39.185360] worker_thread+0x189/0x13c0 [ 39.189317] ? process_one_work+0x1ba0/0x1ba0 [ 39.193805] ? graph_lock+0x170/0x170 [ 39.197598] ? graph_lock+0x170/0x170 [ 39.201392] ? find_held_lock+0x36/0x1c0 [ 39.205445] ? find_held_lock+0x36/0x1c0 [ 39.209488] ? lock_downgrade+0x8f0/0x8f0 [ 39.213618] ? kasan_check_read+0x11/0x20 [ 39.217758] ? do_raw_spin_unlock+0xa7/0x2f0 [ 39.222146] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 39.227228] ? __kthread_parkme+0x58/0x1b0 [ 39.231443] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 39.236441] ? trace_hardirqs_on+0xd/0x10 [ 39.240573] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 39.246094] ? __kthread_parkme+0x106/0x1b0 [ 39.250403] kthread+0x345/0x410 [ 39.253752] ? process_one_work+0x1ba0/0x1ba0 [ 39.258226] ? kthread_bind+0x40/0x40 [ 39.262013] ret_from_fork+0x3a/0x50 [ 39.266333] Dumping ftrace buffer: [ 39.269848] (ftrace buffer empty) [ 39.273532] Kernel Offset: disabled [ 39.277148] Rebooting in 86400 seconds..