[ 15.899262] 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: [ 20.723496] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.988876] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.838082] random: sshd: uninitialized urandom read (32 bytes read, 101 bits of entropy available) [ 31.916323] random: sshd: uninitialized urandom read (32 bytes read, 110 bits of entropy available) Warning: Permanently added '10.128.15.228' (ECDSA) to the list of known hosts. [ 37.294508] random: sshd: uninitialized urandom read (32 bytes read, 116 bits of entropy available) executing program executing program executing program [ 37.403650] ================================================================== [ 37.411041] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 37.418022] Read of size 8 at addr ffff8801d09d1140 by task syzkaller583158/3328 [ 37.425531] [ 37.427129] CPU: 1 PID: 3328 Comm: syzkaller583158 Not tainted 4.4.112-g3fc4284 #32 [ 37.434898] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.444221] 0000000000000000 6efc9409934b2eac ffff8801d05d7ab0 ffffffff81d054ed [ 37.452196] ffffea0007427440 ffff8801d09d1140 0000000000000000 ffff8801d09d1140 [ 37.460182] ffff8801d05ea338 ffff8801d05d7ae8 ffffffff814fd953 ffff8801d09d1140 [ 37.468149] Call Trace: [ 37.470713] [] dump_stack+0xc1/0x124 [ 37.476061] [] print_address_description+0x73/0x260 [ 37.482694] [] kasan_report+0x285/0x370 [ 37.488289] [] ? sg_remove_request+0xf9/0x110 [ 37.494415] [] __asan_report_load8_noabort+0x14/0x20 [ 37.501135] [] sg_remove_request+0xf9/0x110 [ 37.507075] [] sg_finish_rem_req+0x295/0x340 [ 37.513111] [] sg_read+0xa21/0x1490 [ 37.518370] [] ? do_futex+0x3e3/0x1670 [ 37.523878] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 37.530516] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 37.537498] [] ? lockdep_init_map+0xeb/0x1690 [ 37.543612] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 37.550257] [] __vfs_read+0x103/0x440 [ 37.555678] [] ? vfs_iter_write+0x2d0/0x2d0 [ 37.561619] [] ? fsnotify+0x5ad/0xee0 [ 37.567038] [] ? fsnotify+0xee0/0xee0 [ 37.572457] [] ? avc_policy_seqno+0x9/0x20 [ 37.578311] [] ? selinux_file_permission+0x348/0x460 [ 37.585034] [] ? security_file_permission+0x89/0x1e0 [ 37.591757] [] ? rw_verify_area+0x100/0x2f0 [ 37.597696] [] vfs_read+0x123/0x3a0 [ 37.602952] [] SyS_read+0xd9/0x1b0 [ 37.608118] [] ? do_sendfile+0xd30/0xd30 [ 37.613799] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 37.620285] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 37.626842] [ 37.628442] Allocated by task 0: [ 37.631796] (stack is not available) [ 37.635484] [ 37.637080] Freed by task 0: [ 37.640062] (stack is not available) [ 37.643738] [ 37.645336] The buggy address belongs to the object at ffff8801d09d1100 [ 37.645336] which belongs to the cache fasync_cache of size 96 [ 37.657956] The buggy address is located 64 bytes inside of [ 37.657956] 96-byte region [ffff8801d09d1100, ffff8801d09d1160) [ 37.669622] The buggy address belongs to the page: [ 39.156830] PANIC: double fault, error_code: 0x0 [ 39.161611] CPU: 1 PID: 3328 Comm: syzkaller583158 Not tainted 4.4.112-g3fc4284 #32 [ 39.169372] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.178701] task: ffff8801d1712f80 task.stack: ffff8801d05d0000 [ 39.184728] RIP: 0010:[] [] dump_page_badflags+0x8/0x250 [ 39.193489] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 39.198907] RAX: ffff8801d1712f80 RBX: ffffea0007427440 RCX: ffffffff8148fea0 [ 39.206152] RDX: 0000000000000000 RSI: ffffffff838a8620 RDI: ffffea0007427440 [ 39.213405] RBP: ffff880100000010 R08: 0000000000000001 R09: 0000000000000000 [ 39.220659] R10: 0000000000000002 R11: fffffbfff0ad7a1e R12: 0000000000000000 [ 39.227902] R13: ffffffff838a8620 R14: 0000000000000000 R15: 0000000000000000 [ 39.235146] FS: 00007fa207476700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 39.243341] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 39.249292] CR2: ffff8800fffffff8 CR3: 00000000b4154000 CR4: 0000000000160670 [ 39.256544] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 39.263799] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 39.271039] Stack: [ 39.273154] [ 39.274747] Call Trace: [ 39.277303] [ 39.279344] 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 [ 39.306429] Kernel panic - not syncing: Machine halted. [ 39.311762] CPU: 1 PID: 3328 Comm: syzkaller583158 Not tainted 4.4.112-g3fc4284 #32 [ 39.319523] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.328843] 0000000000000000 6efc9409934b2eac ffff8801db30ce38 ffffffff81d054ed [ 39.336817] ffffffff83836a60 ffff8801db30cf10 ffffffff83808040 ffff880100000000 [ 39.344801] 0000000000000000 ffff8801db30cf00 ffffffff81419dca 0000000041b58ab3 [ 39.352775] Call Trace: [ 39.355324] <#DF> [] dump_stack+0xc1/0x124 [ 39.361398] [] panic+0x1aa/0x388 [ 39.366399] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 39.373305] [] ? vprintk_emit+0x242/0x850 [ 39.379074] [] ? dump_page_badflags+0x1d/0x250 [ 39.385286] [] ? vprintk_emit+0x242/0x850 [ 39.391052] [] df_debug+0x2d/0x30 [ 39.396123] [] do_double_fault+0x10b/0x210 [ 39.401975] [] double_fault+0x2d/0x40 [ 39.407393] [] ? dump_page_badflags+0x180/0x250 [ 39.413677] [] ? dump_page_badflags+0x8/0x250 [ 39.419787] <> [ 39.423163] Dumping ftrace buffer: [ 39.427000] (ftrace buffer empty) [ 39.430680] Kernel Offset: disabled [ 39.434287] Rebooting in 86400 seconds..