[....] Starting OpenBSD Secure Shell server: sshd[ 18.822241] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 20.233284] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.414181] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 21.321841] random: sshd: uninitialized urandom read (32 bytes read, 121 bits of entropy available) [ 21.474098] random: sshd: uninitialized urandom read (32 bytes read, 127 bits of entropy available) [ 21.568439] random: nonblocking pool is initialized Warning: Permanently added '10.128.0.23' (ECDSA) to the list of known hosts. executing program [ 26.957229] kasan: CONFIG_KASAN_INLINE enabled [ 26.961660] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 26.974860] Dumping ftrace buffer: [ 26.978383] (ftrace buffer empty) [ 26.982062] Modules linked in: [ 26.985337] CPU: 0 PID: 3780 Comm: syzkaller027365 Not tainted 4.4.116-g17c7c49 #17 [ 26.993123] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.002444] task: ffff8800abba3000 task.stack: ffff8800b1398000 [ 27.008473] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 27.016712] RSP: 0018:ffff8800b139fab0 EFLAGS: 00010a07 [ 27.022134] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b889b [ 27.029380] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 27.036624] RBP: ffff8800b139fac0 R08: 0000000000000000 R09: 0000000000000000 [ 27.043873] R10: 0000000000000000 R11: 1ffff10016273f34 R12: 0000000000000004 [ 27.051110] R13: 0000000000000020 R14: ffff8801d92dc200 R15: dffffc0000000000 [ 27.058348] FS: 0000000000a13880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 27.066545] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.072395] CR2: 00000000205c5fc7 CR3: 00000001c42b0000 CR4: 0000000000160670 [ 27.079634] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.086886] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.094121] Stack: [ 27.096236] ffffffff83775629 ffff8801d92dc358 ffff8800b139fb20 ffffffff825b88c1 [ 27.104199] ffff8801d92dc370 ffffed003b25b86b ffffed003b25b86e ffff8801d92dc368 [ 27.112163] dead4ead00000000 ffff8801d92dc340 0000000000000000 0000000000000000 [ 27.120123] Call Trace: [ 27.122680] [] ? retint_kernel+0x2d/0x2d [ 27.128366] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 27.134825] [] sg_finish_rem_req+0x2b5/0x340 [ 27.140849] [] sg_new_read.isra.18+0x336/0x3c0 [ 27.147049] [] sg_read+0x8bc/0x1490 [ 27.152291] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 27.158936] [] ? __lru_cache_add+0x164/0x240 [ 27.164979] [] ? do_huge_pmd_anonymous_page+0x549/0xa10 [ 27.171968] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 27.178602] [] __vfs_read+0x103/0x440 [ 27.184019] [] ? vfs_iter_write+0x2d0/0x2d0 [ 27.189956] [] ? fsnotify+0x5ad/0xee0 [ 27.195373] [] ? fsnotify+0xee0/0xee0 [ 27.200792] [] ? avc_policy_seqno+0x9/0x20 [ 27.206651] [] ? selinux_file_permission+0x348/0x460 [ 27.213373] [] ? security_file_permission+0x89/0x1e0 [ 27.220091] [] ? rw_verify_area+0x100/0x2f0 [ 27.226029] [] vfs_read+0x123/0x3a0 [ 27.231272] [] SyS_read+0xd9/0x1b0 [ 27.236428] [] ? do_sendfile+0xd30/0xd30 [ 27.242103] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 27.248565] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 27.255109] 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 [ 27.281710] RIP [] __free_pages+0x21/0x90 [ 27.287592] RSP [ 27.291449] ---[ end trace d574069200f37b0f ]--- [ 27.296365] Kernel panic - not syncing: Fatal exception [ 27.302184] Dumping ftrace buffer: [ 27.305694] (ftrace buffer empty) [ 27.309374] Kernel Offset: disabled [ 27.312969] Rebooting in 86400 seconds..