[ 16.713117] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.774080] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 22.133917] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 22.872158] random: sshd: uninitialized urandom read (32 bytes read, 83 bits of entropy available) [ 29.943982] random: sshd: uninitialized urandom read (32 bytes read, 92 bits of entropy available) Warning: Permanently added '10.128.0.35' (ECDSA) to the list of known hosts. [ 35.318724] random: sshd: uninitialized urandom read (32 bytes read, 98 bits of entropy available) executing program [ 35.409357] ================================================================== [ 35.416763] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 35.423761] Read of size 8 at addr ffff8800b5c77140 by task syzkaller575950/3328 [ 35.431258] [ 35.432855] CPU: 0 PID: 3328 Comm: syzkaller575950 Not tainted 4.4.111-g7902639 #25 [ 35.440613] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.449933] 0000000000000000 10db74157e58038b ffff8801d095fab0 ffffffff81d0509d [ 35.457919] ffffea0002d71dc0 ffff8800b5c77140 0000000000000000 ffff8800b5c77140 [ 35.465878] ffff8800b4a70238 ffff8801d095fae8 ffffffff814fd433 ffff8800b5c77140 [ 35.473827] Call Trace: [ 35.476384] [] dump_stack+0xc1/0x124 [ 35.481725] [] print_address_description+0x73/0x260 [ 35.488356] [] kasan_report+0x285/0x370 [ 35.493952] [] ? sg_remove_request+0xf9/0x110 [ 35.500068] [] __asan_report_load8_noabort+0x14/0x20 [ 35.506793] [] sg_remove_request+0xf9/0x110 [ 35.512736] [] sg_finish_rem_req+0x295/0x340 [ 35.518762] [] sg_read+0xa21/0x1490 [ 35.524005] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 35.530637] [] ? new_slab+0x2df/0x3b0 [ 35.536053] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 35.542687] [] __vfs_read+0x103/0x440 [ 35.548104] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 35.555085] [] ? vfs_iter_write+0x2d0/0x2d0 [ 35.561020] [] ? fsnotify+0x5ad/0xee0 [ 35.566438] [] ? fsnotify+0xee0/0xee0 [ 35.571855] [] ? lockdep_init_map+0xeb/0x1690 [ 35.577970] [] ? avc_policy_seqno+0x9/0x20 [ 35.583822] [] ? selinux_file_permission+0x348/0x460 [ 35.590548] [] ? security_file_permission+0x89/0x1e0 [ 35.597276] [] ? rw_verify_area+0x100/0x2f0 [ 35.603223] [] vfs_read+0x123/0x3a0 [ 35.608467] [] SyS_read+0xd9/0x1b0 [ 35.613630] [] ? do_sendfile+0xd30/0xd30 [ 35.619312] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 35.625772] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 35.632314] [ 35.633911] Allocated by task 0: [ 35.637243] (stack is not available) [ 35.640918] [ 35.642521] Freed by task 0: [ 35.645500] (stack is not available) [ 35.649174] [ 35.650767] The buggy address belongs to the object at ffff8800b5c77100 [ 35.650767] which belongs to the cache fasync_cache of size 96 [ 35.663386] The buggy address is located 64 bytes inside of [ 35.663386] 96-byte region [ffff8800b5c77100, ffff8800b5c77160) [ 35.675050] The buggy address belongs to the page: [ 36.390699] BUG: unable to handle kernel paging request at fffffffe092aa300 [ 36.398036] IP: [] cpuacct_charge+0x155/0x390 [ 36.404200] PGD 420f067 PUD 0 [ 36.407588] Oops: 0000 [#1] PREEMPT SMP KASAN [ 36.412503] Dumping ftrace buffer: [ 36.416006] (ftrace buffer empty) [ 36.419683] Modules linked in: [ 36.423007] CPU: 1 PID: 15 Comm: kworker/1:0 Not tainted 4.4.111-g7902639 #25 [ 36.430243] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.439568] Workqueue: events vmstat_shepherd [ 36.444139] task: ffff8801da3e8000 task.stack: ffff8801da3f0000 [ 36.450160] RIP: 0010:[] [] cpuacct_charge+0x155/0x390 [ 36.458729] RSP: 0018:ffff8801da3f7890 EFLAGS: 00010046 [ 36.464143] RAX: 1ffffffff0854dff RBX: 0000000000018528 RCX: ffffffff847ea080 [ 36.471380] RDX: fffffbffc1255460 RSI: fffffffe092aa300 RDI: ffffffff842a6ff8 [ 36.478615] RBP: ffff8801da3f78d8 R08: 0000000000000001 R09: 0000000000000001 [ 36.485849] R10: 0000000000000000 R11: 1ffff1003b47eede R12: ffffffff842a6f20 [ 36.493083] R13: dffffc0000000000 R14: 000000003b031e54 R15: ffffffffd0958050 [ 36.500319] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 36.508514] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.514362] CR2: fffffffe092aa300 CR3: 00000001d30b4000 CR4: 0000000000160670 [ 36.521604] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 36.528839] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 36.536083] Stack: [ 36.538197] ffffffff8122a4a0 ffff8801da3f78c0 0000000000000046 0000000000000003 [ 36.546159] ffff8801d19147a0 ffffffff83843900 000000003b031e54 ffff8801d19147f0 [ 36.554108] ffff8801d1914740 ffff8801da3f7928 ffffffff811dc017 ffff8801db21f4c0 [ 36.562054] Call Trace: [ 36.564611] [] ? cpuacct_charge+0x60/0x390 [ 36.570469] [] update_curr+0x2c7/0x6c0 [ 36.575970] [] enqueue_task_fair+0x313/0x2940 [ 36.582080] [] activate_task+0x148/0x270 [ 36.587756] [] ttwu_do_activate.constprop.131+0xbf/0x1e0 [ 36.594818] [] try_to_wake_up+0x68d/0xf60 [ 36.600581] [] ? __lock_is_held+0xa1/0xf0 [ 36.606343] [] wake_up_process+0x15/0x20 [ 36.612019] [] insert_work+0x171/0x210 [ 36.617527] [] __queue_work+0x3dc/0xea0 [ 36.623114] [] __queue_delayed_work+0x237/0x390 [ 36.629397] [] queue_delayed_work_on+0x59/0xb0 [ 36.635602] [] vmstat_shepherd+0x1c9/0x230 [ 36.641455] [] process_one_work+0x7d7/0x16e0 [ 36.647487] [] ? process_one_work+0x6f7/0x16e0 [ 36.653694] [] ? pwq_dec_nr_in_flight+0x280/0x280 [ 36.660150] [] ? worker_thread+0x284/0xfe0 [ 36.665997] [] worker_thread+0xdf/0xfe0 [ 36.671587] [] kthread+0x268/0x300 [ 36.676741] [] ? process_one_work+0x16e0/0x16e0 [ 36.683026] [] ? kthread_create_on_node+0x400/0x400 [ 36.689658] [] ? kthread_create_on_node+0x400/0x400 [ 36.696292] [] ret_from_fork+0x3f/0x70 [ 36.701805] [] ? kthread_create_on_node+0x400/0x400 [ 36.708433] 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 [ 36.734765] RIP [] cpuacct_charge+0x155/0x390 [ 36.741001] RSP [ 36.744591] CR2: fffffffe092aa300 [ 36.748017] ---[ end trace 9415a4eb9626b736 ]--- [ 36.752738] Kernel panic - not syncing: Fatal exception [ 37.157798] PANIC: double fault, error_code: 0x0 [ 37.162567] CPU: 0 PID: 3328 Comm: syzkaller575950 Tainted: G D 4.4.111-g7902639 #25 [ 37.171547] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.180872] task: ffff8801d1914740 task.stack: ffff8801d0958000 [ 37.186892] RIP: 0010:[] [] dump_page_badflags+0x8/0x250 [ 37.195645] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 37.201058] RAX: ffff8801d1914740 RBX: ffffea0002d71dc0 RCX: ffffffff8148f980 [ 37.208293] RDX: 0000000000000000 RSI: ffffffff838a8360 RDI: ffffea0002d71dc0 [ 37.215536] RBP: ffff880100000010 R08: 0000000000000001 R09: 0000000000000000 [ 37.222777] R10: 0000000000000002 R11: fffffbfff0ad781e R12: 0000000000000000 [ 37.230024] R13: ffffffff838a8360 R14: 0000000000000000 R15: 0000000000000000 [ 37.237261] FS: 00000000015a9880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 37.245451] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 37.251305] CR2: ffff8800fffffff8 CR3: 00000000b4ffc000 CR4: 0000000000160670 [ 37.258545] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 37.265786] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 37.273019] Stack: [ 37.275132] [ 37.276723] Call Trace: [ 37.279270] [ 37.281304] 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 [ 37.826475] Shutting down cpus with NMI [ 37.830937] Dumping ftrace buffer: [ 37.834446] (ftrace buffer empty) [ 37.838121] Kernel Offset: disabled [ 37.841712] Rebooting in 86400 seconds..