[ 16.641486] 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: [ 21.114468] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 21.470936] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.301883] random: sshd: uninitialized urandom read (32 bytes read, 102 bits of entropy available) [ 22.468459] random: sshd: uninitialized urandom read (32 bytes read, 106 bits of entropy available) Warning: Permanently added '10.128.0.18' (ECDSA) to the list of known hosts. [ 27.844681] random: sshd: uninitialized urandom read (32 bytes read, 113 bits of entropy available) executing program [ 27.939983] kasan: CONFIG_KASAN_INLINE enabled [ 27.944435] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.957253] Dumping ftrace buffer: [ 27.960756] (ftrace buffer empty) [ 27.964435] Modules linked in: [ 27.967706] CPU: 0 PID: 3328 Comm: syzkaller775164 Not tainted 4.4.110-g618a510 #15 [ 27.975462] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.984785] task: ffff8800b44017c0 task.stack: ffff8800b4888000 [ 27.990804] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 27.999035] RSP: 0018:ffff8800b488f970 EFLAGS: 00010a07 [ 28.004450] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b9c5b [ 28.011690] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 28.018928] RBP: ffff8800b488f980 R08: 0000000000000001 R09: 0000000000000000 [ 28.026166] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 28.033403] R13: 0000000000000020 R14: ffff8801d0f5c200 R15: dffffc0000000000 [ 28.040638] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000092d3840 [ 28.048830] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 28.054677] CR2: 0000000020ef0fe0 CR3: 00000000b744c000 CR4: 0000000000160670 [ 28.061917] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.069152] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.076388] Stack: [ 28.078503] 0000000000000000 ffff8801d0f5c358 ffff8800b488f9e0 ffffffff825b9c81 [ 28.086457] ffff8801d0f5c370 ffffed003a1eb86b ffffed003a1eb86e ffff8801d0f5c368 [ 28.094399] dead4ead00000000 ffff8801d0f5c340 0000000000000000 0000000000000000 [ 28.102349] Call Trace: [ 28.104903] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 28.111361] [] sg_finish_rem_req+0x2b5/0x340 [ 28.117392] [] sg_new_read.isra.18+0x39/0x3c0 [ 28.123508] [] ? sg_get_rq_mark+0x142/0x190 [ 28.129442] [] sg_read+0x8c2/0x1490 [ 28.134683] [] ? do_page_fault+0x27/0x30 [ 28.140361] [] ? page_fault+0x28/0x30 [ 28.145776] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.152406] [] ? fsnotify+0xee0/0xee0 [ 28.157821] [] ? avc_policy_seqno+0x9/0x20 [ 28.163674] [] do_loop_readv_writev+0x141/0x1e0 [ 28.169956] [] ? security_file_permission+0x89/0x1e0 [ 28.176679] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.183313] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.189944] [] compat_do_readv_writev+0x5df/0x6e0 [ 28.196400] [] ? vfs_writev+0xb0/0xb0 [ 28.201816] [] ? _raw_spin_unlock+0x2c/0x50 [ 28.207753] [] ? handle_mm_fault+0x3f2/0x3190 [ 28.213877] [] compat_readv+0xd9/0x140 [ 28.219377] [] compat_SyS_readv+0xd8/0x1b0 [ 28.225224] [] ? SyS_pwritev+0x230/0x230 [ 28.230900] [] ? do_fast_syscall_32+0xd7/0x890 [ 28.237098] [] ? SyS_pwritev+0x230/0x230 [ 28.242776] [] do_fast_syscall_32+0x314/0x890 [ 28.248890] [] sysenter_flags_fixed+0xd/0x17 [ 28.254914] 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 [ 28.281198] RIP [] __free_pages+0x21/0x90 [ 28.287082] RSP [ 28.290771] ---[ end trace 0d5b75141d583d71 ]--- [ 28.295888] Kernel panic - not syncing: Fatal exception [ 28.301666] Dumping ftrace buffer: [ 28.305187] (ftrace buffer empty) [ 28.308863] Kernel Offset: disabled [ 28.312454] Rebooting in 86400 seconds..