[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.746424] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.516881] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 22.797855] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 23.660730] random: sshd: uninitialized urandom read (32 bytes read, 102 bits of entropy available) [ 23.831576] random: sshd: uninitialized urandom read (32 bytes read, 108 bits of entropy available) Warning: Permanently added '10.128.15.230' (ECDSA) to the list of known hosts. [ 29.213830] random: sshd: uninitialized urandom read (32 bytes read, 114 bits of entropy available) executing program executing program [ 29.316017] ================================================================== [ 29.323425] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 29.330408] Read of size 8 at addr ffff8800b8306140 by task syzkaller889517/3320 [ 29.337908] [ 29.339509] CPU: 0 PID: 3320 Comm: syzkaller889517 Not tainted 4.4.111-gc2f631b #20 [ 29.347271] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.356595] 0000000000000000 8b7d9ea9ae32a00b ffff8801cd5ff970 ffffffff81d0513d [ 29.364560] ffffea0002e0c180 ffff8800b8306140 0000000000000000 ffff8800b8306140 [ 29.374001] ffff8801d0bd8238 ffff8801cd5ff9a8 ffffffff814fd433 ffff8800b8306140 [ 29.381965] Call Trace: [ 29.384523] [] dump_stack+0xc1/0x124 [ 29.389856] [] print_address_description+0x73/0x260 [ 29.396490] [] kasan_report+0x285/0x370 [ 29.402084] [] ? sg_remove_request+0xf9/0x110 [ 29.408196] [] __asan_report_load8_noabort+0x14/0x20 [ 29.414920] [] sg_remove_request+0xf9/0x110 [ 29.420859] [] sg_finish_rem_req+0x295/0x340 [ 29.426884] [] sg_read+0xa21/0x1490 [ 29.432129] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.438764] [] ? fsnotify+0xee0/0xee0 [ 29.444184] [] ? avc_policy_seqno+0x9/0x20 [ 29.450048] [] do_loop_readv_writev+0x141/0x1e0 [ 29.456341] [] ? security_file_permission+0x89/0x1e0 [ 29.463063] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.469697] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.476331] [] compat_do_readv_writev+0x5df/0x6e0 [ 29.483833] [] ? vfs_writev+0xb0/0xb0 [ 29.490178] [] ? __fget+0x232/0x3b0 [ 29.495437] [] ? __fget+0x47/0x3b0 [ 29.500615] [] compat_readv+0xd9/0x140 [ 29.506123] [] compat_SyS_readv+0xd8/0x1b0 [ 29.511974] [] ? SyS_pwritev+0x230/0x230 [ 29.517652] [] ? vmacache_update+0xfe/0x130 [ 29.523590] [] ? do_fast_syscall_32+0xd7/0x890 [ 29.529788] [] ? SyS_pwritev+0x230/0x230 [ 29.535471] [] do_fast_syscall_32+0x314/0x890 [ 29.541590] [] sysenter_flags_fixed+0xd/0x17 [ 29.547612] [ 29.549210] Allocated by task 0: [ 29.552539] (stack is not available) [ 29.556218] [ 29.557814] Freed by task 0: [ 29.560795] (stack is not available) [ 29.564472] [ 29.566071] The buggy address belongs to the object at ffff8800b8306100 [ 29.566071] which belongs to the cache fasync_cache of size 96 [ 29.578703] The buggy address is located 64 bytes inside of [ 29.578703] 96-byte region [ffff8800b8306100, ffff8800b8306160) [ 29.590378] The buggy address belongs to the page: [ 30.255593] BUG: unable to handle kernel paging request at fffffffdef7aa300 [ 30.263025] IP: [] cpuacct_charge+0x155/0x390 [ 30.269828] PGD 420f067 PUD 0 [ 30.274936] Oops: 0000 [#1] PREEMPT SMP KASAN [ 30.280119] Dumping ftrace buffer: [ 30.283651] (ftrace buffer empty) [ 30.287357] Modules linked in: [ 30.290684] CPU: 1 PID: 155 Comm: kworker/1:1 Not tainted 4.4.111-gc2f631b #20 [ 30.298644] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.308006] Workqueue: events vmstat_shepherd [ 30.312637] task: ffff8800bbad2f80 task.stack: ffff8801d9b50000 [ 30.318700] RIP: 0010:[] [] cpuacct_charge+0x155/0x390 [ 30.327347] RSP: 0018:ffff8801d9b57890 EFLAGS: 00010046 [ 30.332792] RAX: 1ffffffff0854dff RBX: 0000000000018528 RCX: ffffffff847ea080 [ 30.340057] RDX: fffffbffbdef5460 RSI: fffffffdef7aa300 RDI: ffffffff842a6ff8 [ 30.347330] RBP: ffff8801d9b578d8 R08: 0000000000000001 R09: 0000000000000001 [ 30.354601] R10: 0000000000000000 R11: 1ffff1003b36aede R12: ffffffff842a6f20 [ 30.361870] R13: dffffc0000000000 R14: 0000000038057dbe R15: ffffffffcd5f8050 [ 30.369141] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 30.377363] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.383248] CR2: fffffffdef7aa300 CR3: 00000000b4512000 CR4: 0000000000160670 [ 30.390519] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.397787] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.405060] Stack: [ 30.407204] ffffffff8122a4a0 ffff8801d9b578c0 0000000000000046 0000000000000003 [ 30.415254] ffff8801d22a2fe0 ffffffff83843900 0000000038057dbe ffff8801d22a3030 [ 30.423296] ffff8801d22a2f80 ffff8801d9b57928 ffffffff811dc017 ffff8801db21f4c0 [ 30.431344] Call Trace: [ 30.433927] [] ? cpuacct_charge+0x60/0x390 [ 30.439804] [] update_curr+0x2c7/0x6c0 [ 30.445334] [] enqueue_task_fair+0x313/0x2940 [ 30.451477] [] activate_task+0x148/0x270 [ 30.457191] [] ttwu_do_activate.constprop.131+0xbf/0x1e0 [ 30.464293] [] try_to_wake_up+0x68d/0xf60 [ 30.470093] [] ? __lock_is_held+0xa1/0xf0 [ 30.475893] [] wake_up_process+0x15/0x20 [ 30.481603] [] insert_work+0x171/0x210 [ 30.487146] [] __queue_work+0x3dc/0xea0 [ 30.492772] [] __queue_delayed_work+0x237/0x390 [ 30.499090] [] queue_delayed_work_on+0x59/0xb0 [ 30.505325] [] vmstat_shepherd+0x1c9/0x230 [ 30.511213] [] process_one_work+0x7d7/0x16e0 [ 30.517276] [] ? process_one_work+0x6f7/0x16e0 [ 30.523512] [] ? pwq_dec_nr_in_flight+0x280/0x280 [ 30.530008] [] ? worker_thread+0x284/0xfe0 [ 30.535897] [] worker_thread+0xdf/0xfe0 [ 30.541522] [] ? __schedule+0xa9d/0x1c70 [ 30.547237] [] ? preempt_schedule+0x24/0x30 [ 30.553209] [] ? ___preempt_schedule+0x12/0x14 [ 30.559444] [] kthread+0x268/0x300 [ 30.564633] [] ? process_one_work+0x16e0/0x16e0 [ 30.570960] [] ? kthread_create_on_node+0x400/0x400 [ 30.577637] [] ? kthread_create_on_node+0x400/0x400 [ 30.584304] [] ret_from_fork+0x3f/0x70 [ 30.589846] [] ? kthread_create_on_node+0x400/0x400 [ 30.596501] Code: 49 8d bc 24 d8 00 00 00 48 89 f8 48 c1 e8 03 42 80 3c 28 00 0f 85 9e 01 00 00 49 8b 9c 24 d8 00 00 00 80 3a 00 0f 85 0a 02 00 00 <4a> 03 1c f9 48 89 d8 48 c1 e8 03 42 80 3c 28 00 0f 85 cf 01 00 [ 30.624076] RIP [] cpuacct_charge+0x155/0x390 [ 30.630350] RSP [ 30.633965] CR2: fffffffdef7aa300 [ 30.637420] ---[ end trace 04be45cc973c702c ]--- [ 30.643641] Kernel panic - not syncing: Fatal exception [ 31.259395] PANIC: double fault, error_code: 0x0 [ 31.264188] CPU: 0 PID: 3320 Comm: syzkaller889517 Tainted: G D 4.4.111-gc2f631b #20 [ 31.273171] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.282497] task: ffff8801d22a2f80 task.stack: ffff8801cd5f8000 [ 31.288527] RIP: 0010:[] [] dump_page_badflags+0x8/0x250 [ 31.297288] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 31.302709] RAX: ffff8801d22a2f80 RBX: ffffea0002e0c180 RCX: ffffffff8148f980 [ 31.309953] RDX: 0000000000000000 RSI: ffffffff838a8360 RDI: ffffea0002e0c180 [ 31.317200] RBP: ffff880100000010 R08: 0000000000000001 R09: 0000000000000000 [ 31.324443] R10: 0000000000000002 R11: fffffbfff0ad781e R12: 0000000000000000 [ 31.331687] R13: ffffffff838a8360 R14: 0000000000000000 R15: 0000000000000000 [ 31.338934] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f76f6b40 [ 31.347154] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 31.353008] CR2: ffff8800fffffff8 CR3: 00000000b4512000 CR4: 0000000000160670 [ 31.360253] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.367496] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.375605] Stack: [ 31.377738] [ 31.379337] Call Trace: [ 31.381891] [ 31.383926] Code: 00 e9 83 fd ff ff e8 a8 e2 06 00 e9 50 fd ff ff e8 9e e2 06 00 e9 1d fd ff ff 66 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 57 41 56 <41> 55 49 89 f5 41 54 49 89 d4 53 48 89 fb 48 83 ec 08 e8 61 06 [ 31.767242] Shutting down cpus with NMI [ 31.771655] Dumping ftrace buffer: [ 31.775165] (ftrace buffer empty) [ 31.778843] Kernel Offset: disabled [ 31.782438] Rebooting in 86400 seconds..