[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.498597] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [ 20.073345] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [ 20.417788] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.194889] random: sshd: uninitialized urandom read (32 bytes read, 97 bits of entropy available) [ 21.377164] random: sshd: uninitialized urandom read (32 bytes read, 105 bits of entropy available) Warning: Permanently added '10.128.0.19' (ECDSA) to the list of known hosts. [ 26.807755] random: sshd: uninitialized urandom read (32 bytes read, 118 bits of entropy available) executing program [ 26.894589] kasan: CONFIG_KASAN_INLINE enabled [ 26.899019] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 26.912536] Dumping ftrace buffer: [ 26.916047] (ftrace buffer empty) [ 26.919728] Modules linked in: [ 26.923013] CPU: 1 PID: 3769 Comm: syzkaller224607 Not tainted 4.4.116-g17c7c49 #17 [ 26.930775] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.940108] task: ffff8801c5e06000 task.stack: ffff8800bb9d0000 [ 26.946133] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 26.954374] RSP: 0018:ffff8800bb9d79f0 EFLAGS: 00010a07 [ 26.959792] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b889b [ 26.967035] RDX: 1bd5a9d5a0000003 RSI: 0000000000000002 RDI: dead4ead0000001c [ 26.974277] RBP: ffff8800bb9d7a00 R08: 0000000048000000 R09: 0000000000001e30 [ 26.981521] R10: 0000000000002100 R11: 1ffff1001773af1c R12: 0000000000000004 [ 26.988777] R13: 0000000000000020 R14: ffff8801cc8a2100 R15: dffffc0000000000 [ 26.996020] FS: 00007f836e19c700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 27.004217] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.010070] CR2: 0000000020a13000 CR3: 00000001c7f8a000 CR4: 0000000000160670 [ 27.017324] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.024576] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.031816] Stack: [ 27.033936] 0000000000000246 ffff8801cc8a2258 ffff8800bb9d7a60 ffffffff825b88c1 [ 27.041923] ffff8801cc8a2270 ffffed003991444b ffffed003991444e ffff8801cc8a2268 [ 27.049902] dead4ead00000000 ffff8801cc8a2240 0000000000000000 0000000000000000 [ 27.057889] Call Trace: [ 27.060452] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 27.066914] [] sg_finish_rem_req+0x2b5/0x340 [ 27.072941] [] sg_new_read.isra.18+0x17d/0x3c0 [ 27.079145] [] sg_read+0x8bc/0x1490 [ 27.084394] [] ? __check_object_size+0x154/0x35b [ 27.090780] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 27.097414] [] ? fsnotify+0xee0/0xee0 [ 27.102837] [] ? avc_policy_seqno+0x9/0x20 [ 27.108690] [] do_loop_readv_writev+0x141/0x1e0 [ 27.114980] [] ? security_file_permission+0x89/0x1e0 [ 27.121704] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 27.128338] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 27.134976] [] do_readv_writev+0x5dd/0x6e0 [ 27.140840] [] ? vfs_write+0x530/0x530 [ 27.146350] [] ? __fget+0x47/0x3b0 [ 27.151512] [] ? __fget+0x20b/0x3b0 [ 27.156759] [] ? __fget+0x232/0x3b0 [ 27.162003] [] ? __fget+0x47/0x3b0 [ 27.167161] [] vfs_readv+0x78/0xb0 [ 27.172320] [] SyS_readv+0xd9/0x240 [ 27.177565] [] ? rw_copy_check_uvector+0x2b0/0x2b0 [ 27.184114] [] ? finish_task_switch+0x1e7/0x4e0 [ 27.190413] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 27.196878] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 27.203423] 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 [ 27.230081] RIP [] __free_pages+0x21/0x90 [ 27.235976] RSP [ 27.240070] ---[ end trace 2c19f59e81b283ac ]--- [ 27.244837] Kernel panic - not syncing: Fatal exception [ 27.250652] Dumping ftrace buffer: [ 27.254163] (ftrace buffer empty) [ 27.257845] Kernel Offset: disabled [ 27.261442] Rebooting in 86400 seconds..