[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.296463] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.525183] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 25.728703] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 26.660457] random: sshd: uninitialized urandom read (32 bytes read, 111 bits of entropy available) [ 26.841260] random: sshd: uninitialized urandom read (32 bytes read, 115 bits of entropy available) Warning: Permanently added '10.128.15.192' (ECDSA) to the list of known hosts. [ 32.257679] random: sshd: uninitialized urandom read (32 bytes read, 121 bits of entropy available) executing program executing program [ 32.365718] kasan: CONFIG_KASAN_INLINE enabled [ 32.370141] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 32.383671] Dumping ftrace buffer: [ 32.387178] (ftrace buffer empty) [ 32.390860] Modules linked in: [ 32.394143] CPU: 0 PID: 3891 Comm: syzkaller260989 Not tainted 4.4.114-ga81d322 #4 [ 32.401818] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.411146] task: ffff8801d9583000 task.stack: ffff8800b0d88000 [ 32.417172] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 32.425412] RSP: 0018:ffff8800b0d8f9f0 EFLAGS: 00010a07 [ 32.430830] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b823b [ 32.438072] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 32.445318] RBP: ffff8800b0d8fa00 R08: 0000000000000001 R09: 0000000000000001 [ 32.452564] R10: 0000000000000000 R11: 1ffff100161b1f1c R12: 0000000000000004 [ 32.459810] R13: 0000000000000020 R14: ffff8801d93cc200 R15: dffffc0000000000 [ 32.467055] FS: 00007f64c4b0a700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 32.475255] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.481106] CR2: 0000000020adff12 CR3: 00000001d21c4000 CR4: 0000000000160670 [ 32.488351] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.495618] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.502864] Stack: [ 32.504983] ffffffff83774ae9 ffff8801d93cc358 ffff8800b0d8fa60 ffffffff825b8261 [ 32.512947] ffff8801d93cc370 ffffed003b27986b ffffed003b27986e ffff8801d93cc368 [ 32.520910] dead4ead00000000 ffff8801d93cc340 0000000000000000 0000000000000000 [ 32.528888] Call Trace: [ 32.531452] [] ? retint_kernel+0x2d/0x2d [ 32.537850] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 32.544328] [] sg_finish_rem_req+0x2b5/0x340 [ 32.550361] [] sg_new_read.isra.18+0x336/0x3c0 [ 32.556566] [] sg_read+0x8bc/0x1490 [ 32.561815] [] ? __check_object_size+0x154/0x35b [ 32.568191] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 32.574829] [] ? fsnotify+0xee0/0xee0 [ 32.580258] [] ? avc_policy_seqno+0x9/0x20 [ 32.586121] [] do_loop_readv_writev+0x141/0x1e0 [ 32.592413] [] ? security_file_permission+0x89/0x1e0 [ 32.599138] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 32.605774] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 32.612412] [] do_readv_writev+0x5dd/0x6e0 [ 32.618268] [] ? vfs_write+0x530/0x530 [ 32.623798] [] ? _raw_spin_unlock+0x2c/0x50 [ 32.629743] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 32.636730] [] ? __fget+0x20b/0x3b0 [ 32.641981] [] ? __fget+0x232/0x3b0 [ 32.647230] [] ? __fget+0x47/0x3b0 [ 32.652391] [] vfs_readv+0x78/0xb0 [ 32.657549] [] SyS_readv+0xd9/0x240 [ 32.662795] [] ? rw_copy_check_uvector+0x2b0/0x2b0 [ 32.669345] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 32.675899] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 32.682446] 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 [ 32.708986] RIP [] __free_pages+0x21/0x90 [ 32.714874] RSP [ 32.718574] ---[ end trace 83a5807d7ebe1a9e ]--- [ 32.723346] Kernel panic - not syncing: Fatal exception [ 32.729172] Dumping ftrace buffer: [ 32.732683] (ftrace buffer empty) [ 32.736361] Kernel Offset: disabled [ 32.739959] Rebooting in 86400 seconds..