[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 17.124045] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.485799] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.867603] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.772835] random: sshd: uninitialized urandom read (32 bytes read, 105 bits of entropy available) [ 22.420829] random: sshd: uninitialized urandom read (32 bytes read, 111 bits of entropy available) Warning: Permanently added '10.128.0.56' (ECDSA) to the list of known hosts. [ 27.819074] random: sshd: uninitialized urandom read (32 bytes read, 119 bits of entropy available) executing program [ 27.911463] ================================================================== [ 27.920246] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 27.927246] Read of size 8 at addr ffff8801d0b69140 by task syzkaller661798/3327 [ 27.934747] [ 27.936883] CPU: 0 PID: 3327 Comm: syzkaller661798 Not tainted 4.4.112-g3fc4284 #32 [ 27.944646] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.953974] 0000000000000000 73613ccd80141818 ffff8801cfde7ab0 ffffffff81d054ed [ 27.961969] ffffea000742da40 ffff8801d0b69140 0000000000000000 ffff8801d0b69140 [ 27.971425] ffff8801d066a338 ffff8801cfde7ae8 ffffffff814fd953 ffff8801d0b69140 [ 27.979387] Call Trace: [ 27.981949] [] dump_stack+0xc1/0x124 [ 27.987287] [] print_address_description+0x73/0x260 [ 27.993923] [] kasan_report+0x285/0x370 [ 27.999527] [] ? sg_remove_request+0xf9/0x110 [ 28.005643] [] __asan_report_load8_noabort+0x14/0x20 [ 28.012373] [] sg_remove_request+0xf9/0x110 [ 28.018319] [] sg_finish_rem_req+0x295/0x340 [ 28.024353] [] sg_read+0xa21/0x1490 [ 28.029606] [] ? new_slab+0x24f/0x3b0 [ 28.035028] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.041668] [] ? __raw_spin_lock_init+0x1c/0x100 [ 28.048061] [] ? lockdep_init_map+0xeb/0x1690 [ 28.055400] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.062054] [] __vfs_read+0x103/0x440 [ 28.067474] [] ? vfs_iter_write+0x2d0/0x2d0 [ 28.073417] [] ? fsnotify+0x5ad/0xee0 [ 28.078839] [] ? fsnotify+0xee0/0xee0 [ 28.084265] [] ? fasync_helper+0x7a/0xb0 [ 28.089949] [] ? avc_policy_seqno+0x9/0x20 [ 28.095808] [] ? selinux_file_permission+0x348/0x460 [ 28.102532] [] ? security_file_permission+0x89/0x1e0 [ 28.109256] [] ? rw_verify_area+0x100/0x2f0 [ 28.115199] [] vfs_read+0x123/0x3a0 [ 28.120792] [] SyS_read+0xd9/0x1b0 [ 28.125965] [] ? do_sendfile+0xd30/0xd30 [ 28.131647] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 28.138121] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 28.144669] [ 28.146267] Allocated by task 0: [ 28.150745] (stack is not available) [ 28.154426] [ 28.156036] Freed by task 0: [ 28.160151] (stack is not available) [ 28.164439] [ 28.166036] The buggy address belongs to the object at ffff8801d0b69100 [ 28.166036] which belongs to the cache fasync_cache of size 96 [ 28.178844] The buggy address is located 64 bytes inside of [ 28.178844] 96-byte region [ffff8801d0b69100, ffff8801d0b69160) [ 28.191211] The buggy address belongs to the page: [ 29.756425] PANIC: double fault, error_code: 0x0 [ 29.761215] CPU: 0 PID: 3327 Comm: syzkaller661798 Not tainted 4.4.112-g3fc4284 #32 [ 29.768995] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.779374] task: ffff8801d2172f80 task.stack: ffff8801cfde0000 [ 29.785409] RIP: 0010:[] [] dump_page_badflags+0x8/0x250 [ 29.794180] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 29.799612] RAX: ffff8801d2172f80 RBX: ffffea000742da40 RCX: ffffffff8148fea0 [ 29.807125] RDX: 0000000000000000 RSI: ffffffff838a8620 RDI: ffffea000742da40 [ 29.814377] RBP: ffff880100000010 R08: 0000000000000001 R09: 0000000000000000 [ 29.821625] R10: 0000000000000002 R11: fffffbfff0ad7a1e R12: 0000000000000000 [ 29.828870] R13: ffffffff838a8620 R14: 0000000000000000 R15: 0000000000000000 [ 29.836116] FS: 00000000008b6880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 29.844321] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.850177] CR2: ffff8800fffffff8 CR3: 00000001d1214000 CR4: 0000000000160670 [ 29.857428] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.864682] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.871931] Stack: [ 29.874056] [ 29.875655] Call Trace: [ 29.878210] [ 29.880245] 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 [ 29.907233] Kernel panic - not syncing: Machine halted. [ 29.912571] CPU: 0 PID: 3327 Comm: syzkaller661798 Not tainted 4.4.112-g3fc4284 #32 [ 29.920349] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.929677] 0000000000000000 73613ccd80141818 ffff8801db20ce38 ffffffff81d054ed [ 29.937653] ffffffff83836a60 ffff8801db20cf10 ffffffff83808040 ffff880100000000 [ 29.945621] 0000000000000000 ffff8801db20cf00 ffffffff81419dca 0000000041b58ab3 [ 29.953628] Call Trace: [ 29.956879] <#DF> [] dump_stack+0xc1/0x124 [ 29.962952] [] panic+0x1aa/0x388 [ 29.967949] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 29.974847] [] ? vprintk_emit+0x242/0x850 [ 29.980617] [] ? dump_page_badflags+0x1d/0x250 [ 29.986822] [] ? vprintk_emit+0x242/0x850 [ 29.992598] [] df_debug+0x2d/0x30 [ 29.997676] [] do_double_fault+0x10b/0x210 [ 30.003530] [] double_fault+0x2d/0x40 [ 30.008956] [] ? dump_page_badflags+0x180/0x250 [ 30.015247] [] ? dump_page_badflags+0x8/0x250 [ 30.021362] <> [ 30.024939] Dumping ftrace buffer: [ 30.028813] (ftrace buffer empty) [ 30.032498] Kernel Offset: disabled [ 30.036114] Rebooting in 86400 seconds..