[ 17.089218] random: sshd: uninitialized urandom read (32 bytes read, 33 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: [ 21.256144] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 21.663672] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 22.497181] random: sshd: uninitialized urandom read (32 bytes read, 99 bits of entropy available) [ 22.679544] random: sshd: uninitialized urandom read (32 bytes read, 104 bits of entropy available) Warning: Permanently added '10.128.0.29' (ECDSA) to the list of known hosts. [ 28.073641] random: sshd: uninitialized urandom read (32 bytes read, 110 bits of entropy available) executing program [ 28.183853] kasan: CONFIG_KASAN_INLINE enabled [ 28.188349] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.201177] Dumping ftrace buffer: [ 28.204681] (ftrace buffer empty) [ 28.208357] Modules linked in: [ 28.211630] CPU: 0 PID: 3335 Comm: syzkaller513337 Not tainted 4.4.111-gf851888 #16 [ 28.219385] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.228714] task: ffff8801d239af80 task.stack: ffff8801cfda8000 [ 28.234734] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 28.242961] RSP: 0018:ffff8801cfdaf970 EFLAGS: 00010a07 [ 28.248382] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b9e9b [ 28.255621] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 28.262855] RBP: ffff8801cfdaf980 R08: 0000000000000001 R09: 0000000000000000 [ 28.270102] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 28.277351] R13: 0000000000000020 R14: ffff8800b473c200 R15: dffffc0000000000 [ 28.284588] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000009b31840 [ 28.292778] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 28.298631] CR2: 0000000020ef0fe0 CR3: 00000001d3fca000 CR4: 0000000000160670 [ 28.305869] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.313106] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.320338] Stack: [ 28.322451] 0000000000000000 ffff8800b473c358 ffff8801cfdaf9e0 ffffffff825b9ec1 [ 28.330396] ffff8800b473c370 ffffed00168e786b ffffed00168e786e ffff8800b473c368 [ 28.338345] dead4ead00000000 ffff8800b473c340 0000000000000000 0000000000000000 [ 28.346307] Call Trace: [ 28.348864] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 28.355328] [] sg_finish_rem_req+0x2b5/0x340 [ 28.361352] [] sg_new_read.isra.18+0x39/0x3c0 [ 28.367461] [] ? sg_get_rq_mark+0x142/0x190 [ 28.373403] [] sg_read+0x8c2/0x1490 [ 28.378645] [] ? do_page_fault+0x27/0x30 [ 28.384331] [] ? page_fault+0x28/0x30 [ 28.389754] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.396473] [] ? fsnotify+0xee0/0xee0 [ 28.401889] [] ? avc_policy_seqno+0x9/0x20 [ 28.407754] [] do_loop_readv_writev+0x141/0x1e0 [ 28.414043] [] ? security_file_permission+0x89/0x1e0 [ 28.420769] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.427400] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.434030] [] compat_do_readv_writev+0x5df/0x6e0 [ 28.440486] [] ? vfs_writev+0xb0/0xb0 [ 28.445906] [] ? _raw_spin_unlock+0x2c/0x50 [ 28.451843] [] ? handle_mm_fault+0x3f2/0x3190 [ 28.457956] [] compat_readv+0xd9/0x140 [ 28.463458] [] compat_SyS_readv+0xd8/0x1b0 [ 28.469306] [] ? SyS_pwritev+0x230/0x230 [ 28.474986] [] ? do_fast_syscall_32+0xd7/0x890 [ 28.481182] [] ? SyS_pwritev+0x230/0x230 [ 28.486855] [] do_fast_syscall_32+0x314/0x890 [ 28.492967] [] sysenter_flags_fixed+0xd/0x17 [ 28.498988] 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 [ 28.525357] RIP [] __free_pages+0x21/0x90 [ 28.531253] RSP [ 28.535568] ---[ end trace 6423596743f616ec ]--- [ 28.540336] Kernel panic - not syncing: Fatal exception [ 28.546124] Dumping ftrace buffer: [ 28.549647] (ftrace buffer empty) [ 28.553325] Kernel Offset: disabled [ 28.556917] Rebooting in 86400 seconds..