[ 15.753356] 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: [ 21.329894] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 21.633891] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 22.334315] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available) [ 22.498272] random: sshd: uninitialized urandom read (32 bytes read, 80 bits of entropy available) Warning: Permanently added '10.128.0.41' (ECDSA) to the list of known hosts. [ 27.910567] random: sshd: uninitialized urandom read (32 bytes read, 84 bits of entropy available) executing program [ 28.007314] sg_write: data in/out 2127708969/3 bytes for SCSI command 0xe3-- guessing data in; [ 28.007314] program syzkaller129023 not setting count and/or reply_len properly [ 28.025989] kasan: CONFIG_KASAN_INLINE enabled [ 28.031031] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.043847] Dumping ftrace buffer: [ 28.047355] (ftrace buffer empty) [ 28.051036] Modules linked in: [ 28.054311] CPU: 1 PID: 3311 Comm: syzkaller129023 Not tainted 4.4.107-g610c835 #4 [ 28.061983] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.071312] task: ffff8801d298af80 task.stack: ffff8801d0d28000 [ 28.077338] RIP: 0010:[] [] sg_read+0xd1d/0x1490 [ 28.085406] RSP: 0018:ffff8801d0d2fa80 EFLAGS: 00010246 [ 28.090826] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff825bb194 [ 28.098070] RDX: 0000000000000000 RSI: 0000000020477024 RDI: ffff8800b46fa270 [ 28.105307] RBP: ffff8801d0d2fb88 R08: 0000000000000000 R09: 0000000000000001 [ 28.112550] R10: 0000000000000000 R11: 1ffff1003a1a5f16 R12: 0000000000000012 [ 28.119787] R13: 0000000000000000 R14: ffff8800b4508900 R15: ffff8800b46fa240 [ 28.127026] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000085b4840 [ 28.135221] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 28.141071] CR2: 0000000020477000 CR3: 00000001d22b3000 CR4: 00000000001406e0 [ 28.148311] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.155549] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.162806] Stack: [ 28.164928] 0000000000000002 0000000000000002 ffff8801d0d2fc40 ffff8800b46fa258 [ 28.172892] 0000000000000282 ffff8800b46fa268 0000000000000036 00000000c454cd53 [ 28.180848] ffff8801d575a780 0000000000001000 1ffff1003a1a5f5c 0000000020477024 [ 28.188807] Call Trace: [ 28.191373] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.198015] [] ? fsnotify+0xee0/0xee0 [ 28.203435] [] ? avc_policy_seqno+0x9/0x20 [ 28.209286] [] do_loop_readv_writev+0x141/0x1e0 [ 28.215569] [] ? security_file_permission+0x89/0x1e0 [ 28.222289] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.228932] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.235570] [] compat_do_readv_writev+0x5df/0x6e0 [ 28.242026] [] ? vfs_writev+0xb0/0xb0 [ 28.247444] [] ? _raw_spin_unlock+0x2c/0x50 [ 28.253382] [] ? handle_mm_fault+0x3f2/0x3190 [ 28.259492] [] ? putname+0xee/0x130 [ 28.264745] [] ? rcu_read_lock_sched_held+0x103/0x120 [ 28.271569] [] ? kmem_cache_free+0x2a4/0x320 [ 28.277599] [] compat_readv+0xd9/0x140 [ 28.283104] [] compat_SyS_readv+0xd8/0x1b0 [ 28.288953] [] ? SyS_pwritev+0x230/0x230 [ 28.294648] [] ? do_fast_syscall_32+0xd7/0x890 [ 28.300849] [] ? SyS_pwritev+0x230/0x230 [ 28.306527] [] do_fast_syscall_32+0x314/0x890 [ 28.312643] [] sysenter_flags_fixed+0xd/0x17 [ 28.318671] 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 [ 28.345059] RIP [] sg_read+0xd1d/0x1490 [ 28.350768] RSP [ 28.354517] ---[ end trace d3da708da7bb8e3a ]--- [ 28.360493] Kernel panic - not syncing: Fatal exception [ 28.366316] Dumping ftrace buffer: [ 28.369831] (ftrace buffer empty) [ 28.373517] Kernel Offset: disabled [ 28.377117] Rebooting in 86400 seconds..