[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 31.031570] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 34.852261] random: sshd: uninitialized urandom read (32 bytes read) [ 35.482878] random: sshd: uninitialized urandom read (32 bytes read) [ 36.649111] random: sshd: uninitialized urandom read (32 bytes read) [ 36.929764] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.22' (ECDSA) to the list of known hosts. [ 42.624121] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 42.743507] BUG: unable to handle kernel NULL pointer dereference at 0000000000000028 [ 42.751523] PGD 80000001c7b8a067 P4D 80000001c7b8a067 PUD 1cb532067 PMD 0 [ 42.758562] Oops: 0000 [#1] SMP PTI [ 42.762175] Dumping ftrace buffer: [ 42.765699] (ftrace buffer empty) [ 42.769394] Modules linked in: [ 42.772591] CPU: 1 PID: 4429 Comm: syz-executor083 Not tainted 4.17.0-rc3+ #88 [ 42.779938] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.789303] RIP: 0010:smc_setsockopt+0xc4/0x1a0 [ 42.793959] RSP: 0018:ffff8801be5ffd60 EFLAGS: 00010246 [ 42.799315] RAX: ffff8801adb202d0 RBX: ffff8801b07c2618 RCX: ffff880000000000 [ 42.806576] RDX: ffff8801ade842d0 RSI: aaaaaaaaaaaab000 RDI: ffffea0000000000 [ 42.813837] RBP: ffff8801be5ffdc8 R08: 0000000000000008 R09: 0000000000000002 [ 42.821097] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 42.828359] R13: 0000000000000028 R14: 0000000000000000 R15: 0000000000000000 [ 42.835632] FS: 0000000000b6c880(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000 [ 42.843854] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 42.849727] CR2: 0000000000000028 CR3: 00000001ae7f0000 CR4: 00000000001406e0 [ 42.856988] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 42.864252] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 42.871507] Call Trace: [ 42.874170] ? smc_shutdown+0x810/0x810 [ 42.878169] __sys_setsockopt+0x4af/0x560 [ 42.882321] __x64_sys_setsockopt+0x15c/0x1c0 [ 42.886818] do_syscall_64+0x154/0x220 [ 42.890704] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 42.895885] RIP: 0033:0x43fcf9 [ 42.899063] RSP: 002b:00007fff86189ec8 EFLAGS: 00000217 ORIG_RAX: 0000000000000036 [ 42.906766] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fcf9 [ 42.914032] RDX: 0000000000000075 RSI: 0000000000000084 RDI: 0000000000000003 [ 42.921305] RBP: 00000000006ca018 R08: 0000000000000008 R09: 00000000004002c8 [ 42.928563] R10: 00000000200012c0 R11: 0000000000000217 R12: 0000000000401620 [ 42.935823] R13: 00000000004016b0 R14: 0000000000000000 R15: 0000000000000000 [ 42.943087] Code: 0f 85 ce 00 00 00 4d 8b 37 4c 89 ff e8 f6 bd 0f f8 4c 8b 38 44 8b 22 4c 89 75 a8 4d 8d 6e 28 4d 85 ff 0f 85 b8 00 00 00 45 89 e6 <4d> 8b 65 00 4c 89 ef e8 d0 bd 0f f8 49 83 c4 68 48 83 38 00 0f [ 42.962448] RIP: smc_setsockopt+0xc4/0x1a0 RSP: ffff8801be5ffd60 [ 42.968578] CR2: 0000000000000028 [ 42.972116] ---[ end trace e9e1118c3db1638f ]--- [ 42.976927] Kernel panic - not syncing: Fatal exception [ 42.982720] Dumping ftrace buffer: [ 42.986250] (ftrace buffer empty) [ 42.989944] Kernel Offset: disabled [ 42.993562] Rebooting in 86400 seconds..