[ 18.659577] random: sshd: uninitialized urandom read (32 bytes read, 31 bits of entropy available) [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 19.770144] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.066392] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 20.887889] random: sshd: uninitialized urandom read (32 bytes read, 107 bits of entropy available) [ 21.045015] random: sshd: uninitialized urandom read (32 bytes read, 111 bits of entropy available) Warning: Permanently added '10.128.0.57' (ECDSA) to the list of known hosts. [ 26.397755] random: sshd: uninitialized urandom read (32 bytes read, 120 bits of entropy available) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 26.708985] random: nonblocking pool is initialized [ 26.710103] kasan: CONFIG_KASAN_INLINE enabled [ 26.710110] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 26.710114] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 26.710119] Dumping ftrace buffer: [ 26.710122] (ftrace buffer empty) [ 26.710125] Modules linked in: [ 26.710132] CPU: 1 PID: 3778 Comm: syzkaller245061 Not tainted 4.4.115-g0e9bcc1 #11 [ 26.710135] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.710140] task: ffff8801c7293000 task.stack: ffff8800bb9f8000 [ 26.710153] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 26.710156] RSP: 0018:ffff8800bb9ff9f0 EFLAGS: 00010a07 [ 26.710160] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b872b [ 26.710164] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 26.710167] RBP: ffff8800bb9ffa00 R08: 0000000000000000 R09: 0000000000000000 [ 26.710170] R10: 0000000000000000 R11: 1ffff1001773ff1e R12: 0000000000000004 [ 26.710174] R13: 0000000000000020 R14: ffff8801c4c48000 R15: dffffc0000000000 [ 26.710179] FS: 000000000195c880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 26.710182] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.710186] CR2: 0000000020b16000 CR3: 00000000a9e12000 CR4: 0000000000160670 [ 26.710192] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.710195] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.710197] Stack: [ 26.710204] 0000000000000000 ffff8801c4c48158 ffff8800bb9ffa60 ffffffff825b8751 [ 26.710211] ffff8801c4c48170 ffffed003898902b ffffed003898902e ffff8801c4c48168 [ 26.710218] dead4ead00000000 ffff8801c4c48140 0000000000000000 0000000000000000 [ 26.710220] Call Trace: [ 26.710229] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 26.710236] [] sg_finish_rem_req+0x2b5/0x340 [ 26.710243] [] sg_new_read.isra.18+0x39/0x3c0 [ 26.710249] [] ? sg_get_rq_mark+0x142/0x190 [ 26.710255] [] sg_read+0x8bc/0x1490 [ 26.710264] [] ? __check_object_size+0x154/0x35b [ 26.710270] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 26.710277] [] ? fsnotify+0xee0/0xee0 [ 26.710286] [] ? avc_policy_seqno+0x9/0x20 [ 26.710293] [] do_loop_readv_writev+0x141/0x1e0 [ 26.710300] [] ? security_file_permission+0x89/0x1e0 [ 26.710306] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 26.710313] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 26.710318] [] do_readv_writev+0x5dd/0x6e0 [ 26.710323] [] ? vfs_write+0x530/0x530 [ 26.710330] [] ? _raw_spin_unlock+0x2c/0x50 [ 26.710336] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 26.710348] [] ? handle_mm_fault+0x3f2/0x3190 [ 26.710354] [] ? __fsnotify_parent+0xbc/0x340 [ 26.710360] [] ? avc_policy_seqno+0x9/0x20 [ 26.710365] [] ? fsnotify+0x5ad/0xee0 [ 26.710373] [] ? __do_page_fault+0x290/0xa00 [ 26.710378] [] vfs_readv+0x78/0xb0 [ 26.710384] [] SyS_readv+0xd9/0x240 [ 26.710389] [] ? rw_copy_check_uvector+0x2b0/0x2b0 [ 26.710396] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 26.710402] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 26.710488] Code: c6 9f 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 [ 26.710494] RIP [] __free_pages+0x21/0x90 [ 26.710496] RSP [ 26.710502] ---[ end trace 4e440108e4dd6a6a ]--- [ 26.710506] Kernel panic - not syncing: Fatal exception [ 27.081435] Dumping ftrace buffer: [ 27.084959] (ftrace buffer empty) [ 27.088637] Kernel Offset: disabled [ 27.092246] Rebooting in 86400 seconds..