[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.557069] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.263063] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.622497] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.552480] random: sshd: uninitialized urandom read (32 bytes read, 111 bits of entropy available) [ 21.716545] random: sshd: uninitialized urandom read (32 bytes read, 116 bits of entropy available) Warning: Permanently added '10.128.15.197' (ECDSA) to the list of known hosts. [ 27.225125] random: sshd: uninitialized urandom read (32 bytes read, 120 bits of entropy available) executing program [ 27.326770] kasan: CONFIG_KASAN_INLINE enabled [ 27.331208] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.344816] Dumping ftrace buffer: [ 27.348327] (ftrace buffer empty) [ 27.352028] Modules linked in: [ 27.355308] CPU: 0 PID: 3324 Comm: syzkaller629832 Not tainted 4.4.107-g610c835 #4 [ 27.362986] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.372321] task: ffff8801d16197c0 task.stack: ffff8800b4eb0000 [ 27.378343] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 27.386575] RSP: 0018:ffff8800b4eb7a40 EFLAGS: 00010a07 [ 27.391996] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 27.399240] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 27.406482] RBP: ffff8800b4eb7a50 R08: 0000000000000001 R09: 0000000000000000 [ 27.413719] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 27.420973] R13: 0000000000000020 R14: ffff8801d0ad4200 R15: dffffc0000000000 [ 27.428218] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000008bdf840 [ 27.436416] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 27.442267] CR2: 000000002082bf88 CR3: 00000001d0baa000 CR4: 00000000001406f0 [ 27.449516] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.456766] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.464016] Stack: [ 27.466130] 0000000000000000 ffff8801d0ad4358 ffff8800b4eb7ab0 ffffffff825b8cf1 [ 27.474091] ffff8801d0ad4370 ffffed003a15a86b ffffed003a15a86e ffff8801d0ad4368 [ 27.482034] dead4ead00000000 ffff8801d0ad4340 0000000000000000 0000000000000000 [ 27.489980] Call Trace: [ 27.492535] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 27.498997] [] sg_finish_rem_req+0x2b5/0x340 [ 27.505040] [] sg_new_read.isra.18+0x39/0x3c0 [ 27.511411] [] ? sg_get_rq_mark+0x142/0x190 [ 27.517354] [] sg_read+0x8c2/0x1490 [ 27.522609] [] ? __alloc_pages_direct_compact+0x250/0x250 [ 27.529857] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.536591] [] ? __lock_is_held+0xa1/0xf0 [ 27.542360] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.548997] [] __vfs_read+0x103/0x440 [ 27.554414] [] ? vfs_iter_write+0x2d0/0x2d0 [ 27.560359] [] ? fsnotify+0x5ad/0xee0 [ 27.565780] [] ? fsnotify+0xee0/0xee0 [ 27.571198] [] ? _raw_spin_unlock+0x2c/0x50 [ 27.577141] [] ? avc_policy_seqno+0x9/0x20 [ 27.582993] [] ? selinux_file_permission+0x348/0x460 [ 27.589712] [] ? security_file_permission+0x89/0x1e0 [ 27.596435] [] ? rw_verify_area+0x100/0x2f0 [ 27.602376] [] vfs_read+0x123/0x3a0 [ 27.607636] [] SyS_read+0xd9/0x1b0 [ 27.612790] [] ? do_sendfile+0xd30/0xd30 [ 27.618467] [] ? do_fast_syscall_32+0xd7/0x890 [ 27.624662] [] ? do_sendfile+0xd30/0xd30 [ 27.630339] [] do_fast_syscall_32+0x314/0x890 [ 27.636455] [] sysenter_flags_fixed+0xd/0x17 [ 27.642474] 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 [ 27.668764] RIP [] __free_pages+0x21/0x90 [ 27.674651] RSP [ 27.678622] ---[ end trace bb5858ae7569eb2a ]--- [ 27.683359] Kernel panic - not syncing: Fatal exception [ 27.689085] Dumping ftrace buffer: [ 27.692593] (ftrace buffer empty) [ 27.696273] Kernel Offset: disabled [ 27.699870] Rebooting in 86400 seconds..