[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.006406] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.592292] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 19.878033] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 20.830962] random: sshd: uninitialized urandom read (32 bytes read, 117 bits of entropy available) [ 21.018101] random: sshd: uninitialized urandom read (32 bytes read, 123 bits of entropy available) [ 21.669740] random: nonblocking pool is initialized Warning: Permanently added '10.128.0.10' (ECDSA) to the list of known hosts. executing program [ 26.501107] sg_write: data in/out 8454115/514 bytes for SCSI command 0x0-- guessing data in; [ 26.501107] program syzkaller598802 not setting count and/or reply_len properly [ 26.518623] kasan: CONFIG_KASAN_INLINE enabled [ 26.523811] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 26.536670] Dumping ftrace buffer: [ 26.540181] (ftrace buffer empty) [ 26.543863] Modules linked in: [ 26.547142] CPU: 0 PID: 3320 Comm: syzkaller598802 Not tainted 4.4.112-g3fc4284 #32 [ 26.554906] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.564235] task: ffff8801d15c2f80 task.stack: ffff8800b3c10000 [ 26.570272] RIP: 0010:[] [] sg_read+0xd1d/0x1490 [ 26.578336] RSP: 0018:ffff8800b3c17b00 EFLAGS: 00010246 [ 26.583768] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff825bc944 [ 26.591011] RDX: 0000000000000000 RSI: 0000000020f93fef RDI: ffff8800b4d0a270 [ 26.598254] RBP: ffff8800b3c17c08 R08: 0000000000000000 R09: 0000000000000001 [ 26.605502] R10: 0000000000000000 R11: 1ffff10016782f26 R12: 000000000000001a [ 26.612742] R13: 0000000000000000 R14: ffff8801d0453a80 R15: ffff8800b4d0a240 [ 26.619988] FS: 000000000200f880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 26.628196] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.634059] CR2: 0000000020f93fcb CR3: 00000000b08d4000 CR4: 0000000000160670 [ 26.641306] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.648548] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.655787] Stack: [ 26.657907] 0000000000000000 000077ff80000000 ffff8800b3c17b60 ffff8800b4d0a258 [ 26.665877] 0000000000000008 ffff8800b4d0a268 000000000000003e 0000000000000001 [ 26.673846] ffff8800b7c96c80 0000000000001000 1ffff10016782f6c 0000000020f93fef [ 26.681845] Call Trace: [ 26.684406] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 26.691051] [] ? fsnotify+0xee0/0xee0 [ 26.696478] [] ? avc_policy_seqno+0x9/0x20 [ 26.702336] [] do_loop_readv_writev+0x141/0x1e0 [ 26.708646] [] ? security_file_permission+0x89/0x1e0 [ 26.715374] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 26.722019] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 26.728666] [] do_readv_writev+0x5dd/0x6e0 [ 26.734523] [] ? vfs_write+0x530/0x530 [ 26.740034] [] ? _raw_spin_unlock+0x2c/0x50 [ 26.745990] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 26.752977] [] ? handle_mm_fault+0x3f2/0x3190 [ 26.759093] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 26.765907] [] ? avc_policy_seqno+0x9/0x20 [ 26.771766] [] ? selinux_file_permission+0x348/0x460 [ 26.778509] [] vfs_readv+0x78/0xb0 [ 26.783674] [] SyS_readv+0xd9/0x240 [ 26.788932] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 26.795483] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 26.802037] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 26.808597] 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 [ 26.835157] RIP [] sg_read+0xd1d/0x1490 [ 26.840885] RSP [ 26.844594] ---[ end trace 08b8c0ce5d181d09 ]--- [ 26.849353] Kernel panic - not syncing: Fatal exception [ 26.855146] Dumping ftrace buffer: [ 26.858659] (ftrace buffer empty) [ 26.862340] Kernel Offset: disabled [ 26.865954] Rebooting in 86400 seconds..