[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.311261] 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: [ 20.081079] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.484632] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.429243] random: sshd: uninitialized urandom read (32 bytes read, 117 bits of entropy available) [ 21.602270] random: sshd: uninitialized urandom read (32 bytes read, 121 bits of entropy available) Warning: Permanently added '10.128.0.63' (ECDSA) to the list of known hosts. [ 26.973467] random: nonblocking pool is initialized executing program [ 27.073432] kasan: CONFIG_KASAN_INLINE enabled [ 27.078238] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.091441] Dumping ftrace buffer: [ 27.094942] (ftrace buffer empty) [ 27.098617] Modules linked in: [ 27.101882] CPU: 0 PID: 3321 Comm: syzkaller709986 Not tainted 4.4.111-g3301b55 #24 [ 27.109638] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.118956] task: ffff8800b4fc4740 task.stack: ffff8801d4c10000 [ 27.124980] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 27.133213] RSP: 0018:ffff8801d4c179f0 EFLAGS: 00010a07 [ 27.138626] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b9ebb [ 27.145861] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 27.153094] RBP: ffff8801d4c17a00 R08: 0000000000000001 R09: 0000000000000000 [ 27.160328] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 27.167563] R13: 0000000000000020 R14: ffff8801d0092100 R15: dffffc0000000000 [ 27.174799] FS: 0000000001732880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 27.182987] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.189186] CR2: 0000000020ef0fe0 CR3: 00000001d0710000 CR4: 0000000000160670 [ 27.196421] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.203661] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.210897] Stack: [ 27.213015] 0000000000000000 ffff8801d0092258 ffff8801d4c17a60 ffffffff825b9ee1 [ 27.220962] ffff8801d0092270 ffffed003a01244b ffffed003a01244e ffff8801d0092268 [ 27.228914] dead4ead00000000 ffff8801d0092240 0000000000000000 0000000000000000 [ 27.236858] Call Trace: [ 27.239414] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 27.245874] [] sg_finish_rem_req+0x2b5/0x340 [ 27.251895] [] sg_new_read.isra.18+0x39/0x3c0 [ 27.258005] [] ? sg_get_rq_mark+0x142/0x190 [ 27.263938] [] sg_read+0x8c2/0x1490 [ 27.269180] [] ? __check_object_size+0x154/0x35b [ 27.275556] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.282183] [] ? fsnotify+0xee0/0xee0 [ 27.287597] [] ? avc_policy_seqno+0x9/0x20 [ 27.293444] [] do_loop_readv_writev+0x141/0x1e0 [ 27.299724] [] ? security_file_permission+0x89/0x1e0 [ 27.306439] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.313336] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.319964] [] do_readv_writev+0x5dd/0x6e0 [ 27.326160] [] ? vfs_write+0x530/0x530 [ 27.331664] [] ? handle_mm_fault+0xbf5/0x3190 [ 27.338034] [] ? _raw_spin_unlock+0x2c/0x50 [ 27.343972] [] ? handle_mm_fault+0x3f2/0x3190 [ 27.350083] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 27.356887] [] ? __fsnotify_parent+0xbc/0x340 [ 27.363000] [] ? avc_policy_seqno+0x9/0x20 [ 27.368849] [] vfs_readv+0x78/0xb0 [ 27.374001] [] SyS_readv+0xd9/0x240 [ 27.379242] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 27.385786] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 27.392333] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 27.398875] 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 [ 27.425130] RIP [] __free_pages+0x21/0x90 [ 27.431006] RSP [ 27.434854] ---[ end trace 10cdc91d96672509 ]--- [ 27.439585] Kernel panic - not syncing: Fatal exception [ 27.445367] Dumping ftrace buffer: [ 27.448878] (ftrace buffer empty) [ 27.452550] Kernel Offset: disabled [ 27.456140] Rebooting in 86400 seconds..