[ 16.891052] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.064719] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 21.407049] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.344478] random: sshd: uninitialized urandom read (32 bytes read, 113 bits of entropy available) [ 22.541000] random: sshd: uninitialized urandom read (32 bytes read, 118 bits of entropy available) Warning: Permanently added '10.128.15.233' (ECDSA) to the list of known hosts. [ 27.955542] random: sshd: uninitialized urandom read (32 bytes read, 125 bits of entropy available) executing program [ 28.059225] ================================================================== [ 28.066707] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 28.073693] Read of size 8 at addr ffff8801d0cbb140 by task syzkaller075044/3321 [ 28.081190] [ 28.082789] CPU: 1 PID: 3321 Comm: syzkaller075044 Not tainted 4.4.111-g7902639 #18 [ 28.090546] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.099868] 0000000000000000 95a688447b3fd755 ffff8801d09d7a40 ffffffff81d0509d [ 28.107825] ffffea0007432ec0 ffff8801d0cbb140 0000000000000000 ffff8801d0cbb140 [ 28.115771] ffff8801d5018238 ffff8801d09d7a78 ffffffff814fd433 ffff8801d0cbb140 [ 28.123753] Call Trace: [ 28.126317] [] dump_stack+0xc1/0x124 [ 28.131651] [] print_address_description+0x73/0x260 [ 28.138303] [] kasan_report+0x285/0x370 [ 28.143922] [] ? sg_remove_request+0xf9/0x110 [ 28.150044] [] __asan_report_load8_noabort+0x14/0x20 [ 28.156783] [] sg_remove_request+0xf9/0x110 [ 28.162746] [] sg_finish_rem_req+0x295/0x340 [ 28.168782] [] sg_read+0xa21/0x1490 [ 28.174026] [] ? sg_fasync+0x8d/0xb0 [ 28.179377] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.186036] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.192820] [] __vfs_read+0x103/0x440 [ 28.198259] [] ? vfs_iter_write+0x2d0/0x2d0 [ 28.204213] [] ? fsnotify+0x5ad/0xee0 [ 28.209634] [] ? fsnotify+0xee0/0xee0 [ 28.215055] [] ? compat_SyS_ioctl+0x117/0x2540 [ 28.221257] [] ? avc_policy_seqno+0x9/0x20 [ 28.227113] [] ? selinux_file_permission+0x348/0x460 [ 28.233853] [] ? security_file_permission+0x89/0x1e0 [ 28.240577] [] ? rw_verify_area+0x100/0x2f0 [ 28.246514] [] vfs_read+0x123/0x3a0 [ 28.251760] [] SyS_read+0xd9/0x1b0 [ 28.256917] [] ? do_sendfile+0xd30/0xd30 [ 28.262592] [] ? do_fast_syscall_32+0xd7/0x890 [ 28.268796] [] ? do_sendfile+0xd30/0xd30 [ 28.274478] [] do_fast_syscall_32+0x314/0x890 [ 28.280599] [] sysenter_flags_fixed+0xd/0x17 [ 28.286619] [ 28.288212] Allocated by task 0: [ 28.291539] (stack is not available) [ 28.295220] [ 28.296813] Freed by task 0: [ 28.299797] (stack is not available) [ 28.303476] [ 28.305070] The buggy address belongs to the object at ffff8801d0cbb100 [ 28.305070] which belongs to the cache fasync_cache of size 96 [ 28.317691] The buggy address is located 64 bytes inside of [ 28.317691] 96-byte region [ffff8801d0cbb100, ffff8801d0cbb160) [ 28.329443] The buggy address belongs to the page: [ 29.910845] PANIC: double fault, error_code: 0x0 [ 29.915622] CPU: 1 PID: 3321 Comm: syzkaller075044 Not tainted 4.4.111-g7902639 #18 [ 29.923384] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.932706] task: ffff8801d2af17c0 task.stack: ffff8801d09d0000 [ 29.938726] RIP: 0010:[] [] dump_page_badflags+0x12/0x250 [ 29.947562] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 29.952975] RAX: ffff8801d2af17c0 RBX: ffffea0007432ec0 RCX: ffffffff8148f980 [ 29.960229] RDX: 0000000000000000 RSI: ffffffff838a8360 RDI: ffffea0007432ec0 [ 29.967463] RBP: ffff880100000020 R08: 0000000000000001 R09: 0000000000000000 [ 29.974698] R10: 0000000000000002 R11: fffffbfff0ad781e R12: 0000000000000000 [ 29.981941] R13: ffffffff838a8360 R14: 0000000000000000 R15: 0000000000000000 [ 29.989179] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:0000000008401840 [ 29.997377] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 30.003224] CR2: ffff8800fffffff8 CR3: 00000001d1aa2000 CR4: 0000000000160670 [ 30.010479] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.017804] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.025038] Stack: [ 30.027158] [ 30.028749] Call Trace: [ 30.031302] [ 30.033327] 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 [ 30.060128] Kernel panic - not syncing: Machine halted. [ 30.065462] CPU: 1 PID: 3321 Comm: syzkaller075044 Not tainted 4.4.111-g7902639 #18 [ 30.073221] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.082541] 0000000000000000 95a688447b3fd755 ffff8801db30ce38 ffffffff81d0509d [ 30.090493] ffffffff838367c0 ffff8801db30cf10 ffffffff83808040 ffff880100000000 [ 30.098443] 0000000000000000 ffff8801db30cf00 ffffffff81419a3a 0000000041b58ab3 [ 30.106422] Call Trace: [ 30.108981] <#DF> [] dump_stack+0xc1/0x124 [ 30.115041] [] panic+0x1aa/0x388 [ 30.120026] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 30.126924] [] ? vprintk_emit+0x242/0x850 [ 30.132693] [] ? dump_page_badflags+0x27/0x250 [ 30.139063] [] ? vprintk_emit+0x242/0x850 [ 30.144833] [] df_debug+0x2d/0x30 [ 30.149907] [] do_double_fault+0x10b/0x210 [ 30.155761] [] double_fault+0x2d/0x40 [ 30.161180] [] ? dump_page_badflags+0x180/0x250 [ 30.167466] [] ? dump_page_badflags+0x12/0x250 [ 30.173666] <> [ 30.177157] Dumping ftrace buffer: [ 30.181014] (ftrace buffer empty) [ 30.184690] Kernel Offset: disabled [ 30.188299] Rebooting in 86400 seconds..