[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.052986] 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: [ 20.026113] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.434218] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.182726] random: sshd: uninitialized urandom read (32 bytes read, 87 bits of entropy available) [ 31.677912] random: sshd: uninitialized urandom read (32 bytes read, 98 bits of entropy available) Warning: Permanently added '10.128.15.244' (ECDSA) to the list of known hosts. [ 37.060406] random: sshd: uninitialized urandom read (32 bytes read, 106 bits of entropy available) executing program [ 37.163700] sg_write: data in/out 1505792696/163 bytes for SCSI command 0xdb-- guessing data in; [ 37.163700] program syzkaller094507 not setting count and/or reply_len properly [ 37.181068] kasan: CONFIG_KASAN_INLINE enabled [ 37.185448] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 37.199761] Dumping ftrace buffer: [ 37.203267] (ftrace buffer empty) [ 37.206945] Modules linked in: [ 37.210215] CPU: 1 PID: 3330 Comm: syzkaller094507 Not tainted 4.4.110-gdac1439 #20 [ 37.217975] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.227314] task: ffff8801d209c740 task.stack: ffff8800b3d60000 [ 37.233337] RIP: 0010:[] [] sg_read+0xd1d/0x1490 [ 37.241395] RSP: 0018:ffff8800b3d67b00 EFLAGS: 00010246 [ 37.246808] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff825bc124 [ 37.254042] RDX: 0000000000000000 RSI: 00000000203d4024 RDI: ffff8800b4400170 [ 37.261278] RBP: ffff8800b3d67c08 R08: 0000000000000000 R09: 0000000000000001 [ 37.268512] R10: 0000000000000000 R11: 1ffff100167acf26 R12: 0000000000000081 [ 37.275749] R13: 0000000000000000 R14: ffff8801d0619e40 R15: ffff8800b4400140 [ 37.282986] FS: 0000000002435880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 37.291176] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 37.297031] CR2: 00000000204bb000 CR3: 00000000b457e000 CR4: 0000000000160670 [ 37.304284] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 37.311519] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 37.318760] Stack: [ 37.320872] 0000000000000000 000077ff80000000 ffff8800b3d67b60 ffff8800b4400158 [ 37.328816] 0000000000000008 ffff8800b4400168 00000000000000a5 0000000000000001 [ 37.336761] ffff8801d50b6280 0000000000001000 1ffff100167acf6c 00000000203d4024 [ 37.344702] Call Trace: [ 37.347258] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 37.353898] [] ? fsnotify+0xee0/0xee0 [ 37.359317] [] ? avc_policy_seqno+0x9/0x20 [ 37.365168] [] do_loop_readv_writev+0x141/0x1e0 [ 37.371452] [] ? security_file_permission+0x89/0x1e0 [ 37.378170] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 37.384802] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 37.391433] [] do_readv_writev+0x5dd/0x6e0 [ 37.397282] [] ? vfs_write+0x530/0x530 [ 37.402786] [] ? _raw_spin_unlock+0x2c/0x50 [ 37.408722] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 37.415700] [] ? handle_mm_fault+0x3f2/0x3190 [ 37.421809] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 37.428614] [] ? avc_policy_seqno+0x9/0x20 [ 37.434462] [] ? selinux_file_permission+0x348/0x460 [ 37.441180] [] vfs_readv+0x78/0xb0 [ 37.446334] [] SyS_readv+0xd9/0x240 [ 37.451583] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 37.458127] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 37.464672] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 37.471214] 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 [ 37.497531] RIP [] sg_read+0xd1d/0x1490 [ 37.503253] RSP [ 37.507378] ---[ end trace cd720c50e65efe4b ]--- [ 37.512114] Kernel panic - not syncing: Fatal exception [ 37.517473] Dumping ftrace buffer: [ 37.520981] (ftrace buffer empty) [ 37.524659] Kernel Offset: disabled [ 37.528250] Rebooting in 86400 seconds..