[....] Starting [ 16.370862] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) 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: [ 22.044683] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 22.334426] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 23.172442] random: sshd: uninitialized urandom read (32 bytes read, 102 bits of entropy available) [ 28.310858] random: sshd: uninitialized urandom read (32 bytes read, 110 bits of entropy available) Warning: Permanently added '10.128.0.63' (ECDSA) to the list of known hosts. [ 33.809656] random: sshd: uninitialized urandom read (32 bytes read, 116 bits of entropy available) executing program executing program executing program executing program [ 33.947887] kasan: CONFIG_KASAN_INLINE enabled [ 33.952357] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 33.965734] Dumping ftrace buffer: [ 33.969239] (ftrace buffer empty) [ 33.972916] Modules linked in: [ 33.976196] CPU: 0 PID: 3340 Comm: syzkaller684131 Not tainted 4.4.107-g610c835 #4 [ 33.983866] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.993191] task: ffff8801d0fd0000 task.stack: ffff8801d1b70000 [ 33.999214] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 34.007454] RSP: 0018:ffff8801d1b77a40 EFLAGS: 00010a07 [ 34.012867] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 34.020104] RDX: 1bd5a9d5a0000003 RSI: 0000000000000020 RDI: dead4ead0000001c [ 34.027341] RBP: ffff8801d1b77a50 R08: 0000000000000001 R09: 0000000000000000 [ 34.034580] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 34.041816] R13: 0000000000000020 R14: ffff8801d11a8000 R15: dffffc0000000000 [ 34.049057] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f7749b40 [ 34.057249] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 34.063098] CR2: 00000000f7749db0 CR3: 00000000b5377000 CR4: 00000000001406f0 [ 34.070338] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 34.077578] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 34.084815] Stack: [ 34.086932] 0000000000000000 ffff8801d11a8158 ffff8801d1b77ab0 ffffffff825b8cf1 [ 34.094950] ffff8801d11a8170 ffffed003a23502b ffffed003a23502e ffff8801d11a8168 [ 34.102906] dead4ead00000000 ffff8801d11a8140 0000000000000000 0000000000000000 [ 34.110871] Call Trace: [ 34.113435] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 34.119912] [] sg_finish_rem_req+0x2b5/0x340 [ 34.126202] [] sg_new_read.isra.18+0x39/0x3c0 [ 34.132319] [] ? sg_get_rq_mark+0x142/0x190 [ 34.138261] [] sg_read+0x8c2/0x1490 [ 34.143510] [] ? do_futex+0x3e3/0x1670 [ 34.149015] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 34.155650] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 34.162629] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 34.169612] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 34.176335] [] __vfs_read+0x103/0x440 [ 34.181754] [] ? vfs_iter_write+0x2d0/0x2d0 [ 34.188041] [] ? fsnotify+0x5ad/0xee0 [ 34.194935] [] ? fsnotify+0xee0/0xee0 [ 34.200353] [] ? avc_policy_seqno+0x9/0x20 [ 34.206206] [] ? selinux_file_permission+0x348/0x460 [ 34.212939] [] ? security_file_permission+0x89/0x1e0 [ 34.219661] [] ? rw_verify_area+0x100/0x2f0 [ 34.225598] [] vfs_read+0x123/0x3a0 [ 34.230841] [] SyS_read+0xd9/0x1b0 [ 34.235999] [] ? do_sendfile+0xd30/0xd30 [ 34.241678] [] ? vmacache_update+0xfe/0x130 [ 34.247616] [] ? do_fast_syscall_32+0xd7/0x890 [ 34.253813] [] ? do_sendfile+0xd30/0xd30 [ 34.259489] [] do_fast_syscall_32+0x314/0x890 [ 34.265605] [] sysenter_flags_fixed+0xd/0x17 [ 34.271627] Code: 76 ae 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 [ 34.298044] RIP [] __free_pages+0x21/0x90 [ 34.303929] RSP [ 34.307858] ---[ end trace 63ebe14dcba8d8ce ]--- [ 34.312604] Kernel panic - not syncing: Fatal exception [ 34.318338] Dumping ftrace buffer: [ 34.322461] (ftrace buffer empty) [ 34.326139] Kernel Offset: disabled [ 34.329731] Rebooting in 86400 seconds..