[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.584089] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.669803] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 18.925904] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 19.729230] random: sshd: uninitialized urandom read (32 bytes read, 92 bits of entropy available) [ 20.568995] random: sshd: uninitialized urandom read (32 bytes read, 97 bits of entropy available) Warning: Permanently added '10.128.15.196' (ECDSA) to the list of known hosts. [ 25.943836] random: sshd: uninitialized urandom read (32 bytes read, 103 bits of entropy available) executing program [ 26.038343] kasan: CONFIG_KASAN_INLINE enabled [ 26.042769] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 26.055594] Dumping ftrace buffer: [ 26.059099] (ftrace buffer empty) [ 26.062776] Modules linked in: [ 26.066070] CPU: 1 PID: 3316 Comm: syzkaller732531 Not tainted 4.4.110-g618a510 #15 [ 26.073826] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.083162] task: ffff8800b5594740 task.stack: ffff8800b0f70000 [ 26.089191] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 26.097445] RSP: 0018:ffff8800b0f77970 EFLAGS: 00010a07 [ 26.102864] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b9c5b [ 26.110101] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 26.117344] RBP: ffff8800b0f77980 R08: 0000000000000001 R09: 0000000000000000 [ 26.124586] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 26.131828] R13: 0000000000000020 R14: ffff8801d120a100 R15: dffffc0000000000 [ 26.139074] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:000000000911b840 [ 26.147275] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 26.153127] CR2: 0000000020ef0fe0 CR3: 00000000b469a000 CR4: 0000000000160670 [ 26.160368] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.167614] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.174858] Stack: [ 26.176978] 0000000000000000 ffff8801d120a258 ffff8800b0f779e0 ffffffff825b9c81 [ 26.184950] ffff8801d120a270 ffffed003a24144b ffffed003a24144e ffff8801d120a268 [ 26.192923] dead4ead00000000 ffff8801d120a240 0000000000000000 0000000000000000 [ 26.200891] Call Trace: [ 26.203448] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 26.209911] [] sg_finish_rem_req+0x2b5/0x340 [ 26.215938] [] sg_new_read.isra.18+0x39/0x3c0 [ 26.222055] [] ? sg_get_rq_mark+0x142/0x190 [ 26.228001] [] sg_read+0x8c2/0x1490 [ 26.233251] [] ? do_page_fault+0x27/0x30 [ 26.238929] [] ? page_fault+0x28/0x30 [ 26.244345] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 26.250981] [] ? fsnotify+0xee0/0xee0 [ 26.256401] [] ? avc_policy_seqno+0x9/0x20 [ 26.262253] [] do_loop_readv_writev+0x141/0x1e0 [ 26.269325] [] ? security_file_permission+0x89/0x1e0 [ 26.276052] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 26.282687] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 26.289332] [] compat_do_readv_writev+0x5df/0x6e0 [ 26.295791] [] ? vfs_writev+0xb0/0xb0 [ 26.301210] [] ? _raw_spin_unlock+0x2c/0x50 [ 26.307152] [] ? handle_mm_fault+0x3f2/0x3190 [ 26.313273] [] compat_readv+0xd9/0x140 [ 26.318799] [] compat_SyS_readv+0xd8/0x1b0 [ 26.324673] [] ? SyS_pwritev+0x230/0x230 [ 26.330375] [] ? do_fast_syscall_32+0xd7/0x890 [ 26.336585] [] ? SyS_pwritev+0x230/0x230 [ 26.342272] [] do_fast_syscall_32+0x314/0x890 [ 26.348394] [] sysenter_flags_fixed+0xd/0x17 [ 26.354419] Code: 96 a4 0c 00 e9 78 fd ff ff 90 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 53 48 89 fb 48 83 c7 1c 48 89 fa 48 83 ec 08 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 49 [ 26.380740] RIP [] __free_pages+0x21/0x90 [ 26.386622] RSP [ 26.391607] ---[ end trace 338e94f8969fa43f ]--- [ 26.397248] Kernel panic - not syncing: Fatal exception [ 26.403119] Dumping ftrace buffer: [ 26.406635] (ftrace buffer empty) [ 26.410312] Kernel Offset: disabled [ 26.413906] Rebooting in 86400 seconds..