[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.390969] 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: [ 19.764446] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 19.996969] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.792706] random: sshd: uninitialized urandom read (32 bytes read, 100 bits of entropy available) [ 20.967024] random: sshd: uninitialized urandom read (32 bytes read, 104 bits of entropy available) Warning: Permanently added '10.128.15.213' (ECDSA) to the list of known hosts. [ 26.350779] random: sshd: uninitialized urandom read (32 bytes read, 110 bits of entropy available) executing program [ 26.448960] kasan: CONFIG_KASAN_INLINE enabled [ 26.453594] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 26.467908] Dumping ftrace buffer: [ 26.471413] (ftrace buffer empty) [ 26.475097] Modules linked in: [ 26.478365] CPU: 1 PID: 3320 Comm: syzkaller245471 Not tainted 4.4.107-g610c835 #4 [ 26.486033] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.496623] task: ffff8800b4eec740 task.stack: ffff8801d0848000 [ 26.502653] RIP: 0010:[] [] sg_read+0xd1d/0x1490 [ 26.510700] RSP: 0018:ffff8801d084fa80 EFLAGS: 00010246 [ 26.516112] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff825bb194 [ 26.523345] RDX: 0000000000000000 RSI: 000000002066ffd5 RDI: ffff8801cc644370 [ 26.530580] RBP: ffff8801d084fb88 R08: 8551c99c2a45b4bd R09: 0000000000000001 [ 26.537816] R10: 0000000000000000 R11: 1ffff1003a109f16 R12: 000000000000002b [ 26.545403] R13: 0000000000000000 R14: ffff8801d0fbb240 R15: ffff8801cc644340 [ 26.552639] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:0000000009477840 [ 26.560828] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 26.566674] CR2: 000000002066ffb1 CR3: 00000001d1497000 CR4: 00000000001406e0 [ 26.573908] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.581142] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.588373] Stack: [ 26.590491] ffffffff810dbb17 ffffffff83775058 ffff8800b4eec740 ffff8801cc644358 [ 26.598470] 000000000000028a ffff8801cc644368 000000000000004f 0000000000000002 [ 26.606182] ffff8800b7de3400 0000000000001000 1ffff1003a109f5c 000000002066ffd5 [ 26.606189] Call Trace: [ 26.606202] [] ? do_page_fault+0x27/0x30 [ 26.606209] [] ? page_fault+0x28/0x30 [ 26.606219] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 26.606225] [] ? fsnotify+0xee0/0xee0 [ 26.606235] [] ? avc_policy_seqno+0x9/0x20 [ 26.606244] [] do_loop_readv_writev+0x141/0x1e0 [ 26.606251] [] ? security_file_permission+0x89/0x1e0 [ 26.606257] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 26.606264] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 26.606270] [] compat_do_readv_writev+0x5df/0x6e0 [ 26.606276] [] ? vfs_writev+0xb0/0xb0 [ 26.606283] [] ? _raw_spin_unlock+0x2c/0x50 [ 26.606291] [] ? handle_mm_fault+0x3f2/0x3190 [ 26.606297] [] ? security_file_permission+0x89/0x1e0 [ 26.606304] [] compat_readv+0xd9/0x140 [ 26.606309] [] compat_SyS_readv+0xd8/0x1b0 [ 26.606314] [] ? SyS_pwritev+0x230/0x230 [ 26.606321] [] ? do_fast_syscall_32+0xd7/0x890 [ 26.606326] [] ? SyS_pwritev+0x230/0x230 [ 26.606332] [] do_fast_syscall_32+0x314/0x890 [ 26.606338] [] sysenter_flags_fixed+0xd/0x17 [ 26.606425] 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 [ 26.606432] RIP [] sg_read+0xd1d/0x1490 [ 26.606434] RSP [ 26.610976] ---[ end trace 38f846059fec801c ]--- [ 26.610980] Kernel panic - not syncing: Fatal exception [ 26.611667] Dumping ftrace buffer: [ 26.611670] (ftrace buffer empty) [ 26.611673] Kernel Offset: disabled [ 26.797074] Rebooting in 86400 seconds..