[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[[ 16.217382] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) 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: [ 22.399568] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 22.790736] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 23.684765] random: sshd: uninitialized urandom read (32 bytes read, 108 bits of entropy available) [ 23.849786] random: sshd: uninitialized urandom read (32 bytes read, 112 bits of entropy available) Warning: Permanently added '10.128.0.48' (ECDSA) to the list of known hosts. [ 29.274054] random: sshd: uninitialized urandom read (32 bytes read, 120 bits of entropy available) executing program [ 29.372787] ================================================================== [ 29.380189] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 29.387175] Read of size 8 at addr ffff8801d08c2140 by task syzkaller100449/3312 [ 29.394678] [ 29.396273] CPU: 0 PID: 3312 Comm: syzkaller100449 Not tainted 4.4.111-g7902639 #18 [ 29.404030] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.413349] 0000000000000000 e79d2d1e9d30e186 ffff8801cc9afa40 ffffffff81d0509d [ 29.421316] ffffea0007423080 ffff8801d08c2140 0000000000000000 ffff8801d08c2140 [ 29.429263] ffff8801d01b8238 ffff8801cc9afa78 ffffffff814fd433 ffff8801d08c2140 [ 29.437211] Call Trace: [ 29.439779] [] dump_stack+0xc1/0x124 [ 29.445110] [] print_address_description+0x73/0x260 [ 29.451738] [] kasan_report+0x285/0x370 [ 29.457330] [] ? sg_remove_request+0xf9/0x110 [ 29.463439] [] __asan_report_load8_noabort+0x14/0x20 [ 29.470155] [] sg_remove_request+0xf9/0x110 [ 29.476093] [] sg_finish_rem_req+0x295/0x340 [ 29.482116] [] sg_read+0xa21/0x1490 [ 29.487364] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.494006] [] ? __raw_spin_lock_init+0x1c/0x100 [ 29.500378] [] ? lockdep_init_map+0xeb/0x1690 [ 29.506494] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.513127] [] __vfs_read+0x103/0x440 [ 29.518543] [] ? vfs_iter_write+0x2d0/0x2d0 [ 29.524482] [] ? fsnotify+0x5ad/0xee0 [ 29.529897] [] ? fsnotify+0xee0/0xee0 [ 29.535320] [] ? avc_policy_seqno+0x9/0x20 [ 29.541168] [] ? selinux_file_permission+0x348/0x460 [ 29.547887] [] ? security_file_permission+0x89/0x1e0 [ 29.554607] [] ? rw_verify_area+0x100/0x2f0 [ 29.560541] [] vfs_read+0x123/0x3a0 [ 29.565783] [] SyS_read+0xd9/0x1b0 [ 29.570935] [] ? do_sendfile+0xd30/0xd30 [ 29.576618] [] ? vmacache_update+0xfe/0x130 [ 29.582567] [] ? do_fast_syscall_32+0xd7/0x890 [ 29.588773] [] ? do_sendfile+0xd30/0xd30 [ 29.594454] [] do_fast_syscall_32+0x314/0x890 [ 29.600572] [] sysenter_flags_fixed+0xd/0x17 [ 29.606601] [ 29.608197] Allocated by task 0: [ 29.611525] (stack is not available) [ 29.615200] [ 29.616793] Freed by task 0: [ 29.619772] (stack is not available) [ 29.623452] [ 29.625053] The buggy address belongs to the object at ffff8801d08c2100 [ 29.625053] which belongs to the cache fasync_cache of size 96 [ 29.637679] The buggy address is located 64 bytes inside of [ 29.637679] 96-byte region [ffff8801d08c2100, ffff8801d08c2160) [ 29.649343] The buggy address belongs to the page: [ 31.067125] PANIC: double fault, error_code: 0x0 [ 31.071899] CPU: 0 PID: 3312 Comm: syzkaller100449 Not tainted 4.4.111-g7902639 #18 [ 31.079658] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.089000] task: ffff8801d0b517c0 task.stack: ffff8801cc9a8000 [ 31.095020] RIP: 0010:[] [] dump_page_badflags+0x12/0x250 [ 31.103853] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 31.109272] RAX: ffff8801d0b517c0 RBX: ffffea0007423080 RCX: ffffffff8148f980 [ 31.116509] RDX: 0000000000000000 RSI: ffffffff838a8360 RDI: ffffea0007423080 [ 31.123750] RBP: ffff880100000020 R08: 0000000000000001 R09: 0000000000000000 [ 31.130985] R10: 0000000000000002 R11: fffffbfff0ad781e R12: 0000000000000000 [ 31.138229] R13: ffffffff838a8360 R14: 0000000000000000 R15: 0000000000000000 [ 31.145468] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000009ef3840 [ 31.153662] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 31.159515] CR2: ffff8800fffffff8 CR3: 00000001d0b24000 CR4: 0000000000160670 [ 31.166753] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.173988] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.181233] Stack: [ 31.183346] [ 31.184937] Call Trace: [ 31.187482] [ 31.189506] Code: 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 ed ff 48 8d 7b 10 48 b8 00 00 [ 31.216179] Kernel panic - not syncing: Machine halted. [ 31.221509] CPU: 0 PID: 3312 Comm: syzkaller100449 Not tainted 4.4.111-g7902639 #18 [ 31.229266] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.238591] 0000000000000000 e79d2d1e9d30e186 ffff8801db20ce38 ffffffff81d0509d [ 31.246555] ffffffff838367c0 ffff8801db20cf10 ffffffff83808040 ffff880100000000 [ 31.254520] 0000000000000000 ffff8801db20cf00 ffffffff81419a3a 0000000041b58ab3 [ 31.262472] Call Trace: [ 31.265026] <#DF> [] dump_stack+0xc1/0x124 [ 31.271085] [] panic+0x1aa/0x388 [ 31.276071] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 31.282965] [] ? vprintk_emit+0x242/0x850 [ 31.288728] [] ? dump_page_badflags+0x27/0x250 [ 31.294926] [] ? vprintk_emit+0x242/0x850 [ 31.300689] [] df_debug+0x2d/0x30 [ 31.305758] [] do_double_fault+0x10b/0x210 [ 31.311612] [] double_fault+0x2d/0x40 [ 31.317028] [] ? dump_page_badflags+0x180/0x250 [ 31.323325] [] ? dump_page_badflags+0x12/0x250 [ 31.329517] <> [ 31.332556] Dumping ftrace buffer: [ 31.336396] (ftrace buffer empty) [ 31.340082] Kernel Offset: disabled [ 31.343686] Rebooting in 86400 seconds..