[ 16.476068] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.983613] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.353285] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.150570] random: sshd: uninitialized urandom read (32 bytes read, 95 bits of entropy available) [ 22.318042] random: sshd: uninitialized urandom read (32 bytes read, 99 bits of entropy available) Warning: Permanently added '10.128.0.55' (ECDSA) to the list of known hosts. [ 27.773204] random: sshd: uninitialized urandom read (32 bytes read, 107 bits of entropy available) executing program [ 27.875403] kasan: CONFIG_KASAN_INLINE enabled [ 27.879834] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.892648] Dumping ftrace buffer: [ 27.896153] (ftrace buffer empty) [ 27.899830] Modules linked in: [ 27.903099] CPU: 0 PID: 3312 Comm: syzkaller023054 Not tainted 4.4.107-g610c835 #12 [ 27.910855] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.920177] task: ffff8801d1bd97c0 task.stack: ffff8800b0d28000 [ 27.926198] RIP: 0010:[] [] sg_read+0xd1d/0x1490 [ 27.934250] RSP: 0018:ffff8800b0d2fb00 EFLAGS: 00010246 [ 27.939660] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff825bb194 [ 27.946896] RDX: 0000000000000000 RSI: 000000002066ffd5 RDI: ffff8800b0cac370 [ 27.954142] RBP: ffff8800b0d2fc08 R08: 8551c99c2a45b4bd R09: 0000000000000001 [ 27.961378] R10: 0000000000000000 R11: 1ffff100161a5f26 R12: 000000000000002b [ 27.968616] R13: 0000000000000000 R14: ffff8801d14e4300 R15: ffff8800b0cac340 [ 27.975853] FS: 0000000002176880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 27.984044] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.989897] CR2: 000000002066ffb1 CR3: 00000000b5304000 CR4: 00000000001406f0 [ 27.997133] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.004368] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.011603] Stack: [ 28.013714] 0000000000000000 000077ff80000000 ffff8800b0d2fb60 ffff8800b0cac358 [ 28.021668] 0000000000000008 ffff8800b0cac368 000000000000004f 0000000000000003 [ 28.029616] ffff8800b7e9ec80 0000000000001000 1ffff100161a5f6c 000000002066ffd5 [ 28.037561] Call Trace: [ 28.040116] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.046747] [] ? fsnotify+0xee0/0xee0 [ 28.052172] [] ? avc_policy_seqno+0x9/0x20 [ 28.058023] [] do_loop_readv_writev+0x141/0x1e0 [ 28.064307] [] ? security_file_permission+0x89/0x1e0 [ 28.071026] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.077658] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.084291] [] do_readv_writev+0x5dd/0x6e0 [ 28.090142] [] ? vfs_write+0x530/0x530 [ 28.095645] [] ? handle_mm_fault+0xbf5/0x3190 [ 28.101769] [] ? _raw_spin_unlock+0x2c/0x50 [ 28.107706] [] ? handle_mm_fault+0x3f2/0x3190 [ 28.113818] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 28.120637] [] vfs_readv+0x78/0xb0 [ 28.125792] [] SyS_readv+0xd9/0x240 [ 28.131033] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 28.137580] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 28.144134] [] entry_SYSCALL_64_fastpath+0x16/0x76 [ 28.150685] Code: 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 97 06 00 00 48 b8 00 00 00 00 00 fc ff df 49 8b 5f 28 48 89 da 48 c1 ea 03 <80> 3c 02 00 0f 85 6b 06 00 00 48 8b 1b 48 85 db 0f 84 3b 03 00 [ 28.177049] RIP [] sg_read+0xd1d/0x1490 [ 28.182756] RSP [ 28.186473] ---[ end trace 3d4e9dbb4fd9cf17 ]--- [ 28.191216] Kernel panic - not syncing: Fatal exception [ 28.197028] Dumping ftrace buffer: [ 28.200534] (ftrace buffer empty) [ 28.204212] Kernel Offset: disabled [ 28.207802] Rebooting in 86400 seconds..