[ 15.118056] 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: [ 20.690506] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 21.055687] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 21.947750] random: sshd: uninitialized urandom read (32 bytes read, 112 bits of entropy available) [ 22.147371] random: sshd: uninitialized urandom read (32 bytes read, 118 bits of entropy available) Warning: Permanently added '10.128.0.11' (ECDSA) to the list of known hosts. [ 27.540777] random: sshd: uninitialized urandom read (32 bytes read, 126 bits of entropy available) executing program executing program executing program [ 27.662824] ================================================================== [ 27.670228] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 27.677209] Read of size 8 at addr ffff8801d043a240 by task syzkaller006389/3317 [ 27.684715] [ 27.686407] CPU: 1 PID: 3317 Comm: syzkaller006389 Not tainted 4.4.112-g5f6325b #28 [ 27.694166] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.703501] 0000000000000000 b5ca3c0d7f4a5e94 ffff8801cfc079f0 ffffffff81d0579d [ 27.711470] ffffea0007410e80 ffff8801d043a240 0000000000000000 ffff8801d043a240 [ 27.719440] ffff8800b4ba2338 ffff8801cfc07a28 ffffffff814fd9f3 ffff8801d043a240 [ 27.727418] Call Trace: [ 27.729979] [] dump_stack+0xc1/0x124 [ 27.735317] [] print_address_description+0x73/0x260 [ 27.741953] [] kasan_report+0x285/0x370 [ 27.747550] [] ? sg_remove_request+0xf9/0x110 [ 27.753674] [] __asan_report_load8_noabort+0x14/0x20 [ 27.760397] [] sg_remove_request+0xf9/0x110 [ 27.766339] [] sg_finish_rem_req+0x295/0x340 [ 27.772370] [] sg_read+0xa21/0x1490 [ 27.777616] [] ? __check_object_size+0x154/0x35b [ 27.784000] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.790645] [] ? fsnotify+0xee0/0xee0 [ 27.796072] [] ? avc_policy_seqno+0x9/0x20 [ 27.801928] [] do_loop_readv_writev+0x141/0x1e0 [ 27.808226] [] ? security_file_permission+0x89/0x1e0 [ 27.814947] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.821587] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.828231] [] do_readv_writev+0x5dd/0x6e0 [ 27.834083] [] ? vfs_write+0x530/0x530 [ 27.839597] [] ? __fget+0x20b/0x3b0 [ 27.844844] [] ? __fget+0x232/0x3b0 [ 27.850089] [] ? __fget+0x47/0x3b0 [ 27.855247] [] vfs_readv+0x78/0xb0 [ 27.860405] [] SyS_readv+0xd9/0x240 [ 27.865648] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 27.872197] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 27.878771] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 27.885319] [ 27.886918] Allocated by task 0: [ 27.890258] (stack is not available) [ 27.893938] [ 27.895536] Freed by task 0: [ 27.898518] (stack is not available) [ 27.902195] [ 27.903794] The buggy address belongs to the object at ffff8801d043a200 [ 27.903794] which belongs to the cache fasync_cache of size 96 [ 27.916422] The buggy address is located 64 bytes inside of [ 27.916422] 96-byte region [ffff8801d043a200, ffff8801d043a260) [ 27.928104] The buggy address belongs to the page: [ 29.405445] PANIC: double fault, error_code: 0x0 [ 29.410213] CPU: 1 PID: 3317 Comm: syzkaller006389 Not tainted 4.4.112-g5f6325b #28 [ 29.418072] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.427398] task: ffff8800b5f1df00 task.stack: ffff8801cfc00000 [ 29.433421] RIP: 0010:[] [] dump_page_badflags+0x8/0x250 [ 29.442182] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 29.447611] RAX: ffff8800b5f1df00 RBX: ffffea0007410e80 RCX: ffffffff8148ff40 [ 29.454852] RDX: 0000000000000000 RSI: ffffffff838a8620 RDI: ffffea0007410e80 [ 29.462092] RBP: ffff880100000010 R08: 0000000000000001 R09: 0000000000000000 [ 29.469343] R10: 0000000000000002 R11: fffffbfff0ad7a1e R12: 0000000000000000 [ 29.476585] R13: ffffffff838a8620 R14: 0000000000000000 R15: 0000000000000000 [ 29.483832] FS: 00007f3c44d3a700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 29.492038] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.497889] CR2: ffff8800fffffff8 CR3: 00000000b4212000 CR4: 0000000000160670 [ 29.505140] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.512381] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.519621] Stack: [ 29.521737] [ 29.523331] Call Trace: [ 29.525879] [ 29.527910] 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 11 01 [ 29.554978] Kernel panic - not syncing: Machine halted. [ 29.560322] CPU: 1 PID: 3317 Comm: syzkaller006389 Not tainted 4.4.112-g5f6325b #28 [ 29.568096] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.577435] 0000000000000000 b5ca3c0d7f4a5e94 ffff8801db30ce38 ffffffff81d0579d [ 29.585439] ffffffff83836a60 ffff8801db30cf10 ffffffff83808040 ffff880100000000 [ 29.593432] 0000000000000000 ffff8801db30cf00 ffffffff81419e6a 0000000041b58ab3 [ 29.601411] Call Trace: [ 29.603961] <#DF> [] dump_stack+0xc1/0x124 [ 29.610027] [] panic+0x1aa/0x388 [ 29.615012] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 29.621910] [] ? vprintk_emit+0x242/0x850 [ 29.627679] [] ? dump_page_badflags+0x1d/0x250 [ 29.633878] [] ? vprintk_emit+0x242/0x850 [ 29.639648] [] df_debug+0x2d/0x30 [ 29.644722] [] do_double_fault+0x10b/0x210 [ 29.650576] [] double_fault+0x2d/0x40 [ 29.655995] [] ? dump_page_badflags+0x180/0x250 [ 29.662288] [] ? dump_page_badflags+0x8/0x250 [ 29.668401] <> [ 29.671875] Dumping ftrace buffer: [ 29.675716] (ftrace buffer empty) [ 29.679398] Kernel Offset: disabled [ 29.683002] Rebooting in 86400 seconds..