[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.558913] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 19.448947] random: sshd: uninitialized urandom read (32 bytes read) [ 19.648206] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.443871] random: sshd: uninitialized urandom read (32 bytes read) [ 32.974400] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.36' (ECDSA) to the list of known hosts. [ 38.412791] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 38.501106] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 [ 38.509109] PGD 1d8bd7067 P4D 1d8bd7067 PUD 1adf8c067 PMD 0 [ 38.514908] Oops: 0010 [#1] SMP KASAN [ 38.518701] CPU: 1 PID: 4527 Comm: syz-executor698 Not tainted 4.17.0+ #84 [ 38.525692] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.535028] RIP: 0010: (null) [ 38.538977] Code: Bad RIP value. [ 38.542334] RSP: 0018:ffff8801a8e3f590 EFLAGS: 00010246 [ 38.547688] RAX: 0000000000000000 RBX: ffff8801adb3b800 RCX: 1ffffffff10ea9fd [ 38.555377] RDX: ffff8801a8e3fab0 RSI: ffff8801a8ab9000 RDI: ffff8801d856ca40 [ 38.562719] RBP: ffff8801a8e3f700 R08: 0000000000000001 R09: 0000000000000000 [ 38.569984] R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff100351c7eb7 [ 38.577249] R13: ffff8801a8e3fab0 R14: ffff8801adb3b812 R15: ffff8801adb3bc58 [ 38.584535] FS: 0000000000b3b880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 38.592834] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.598831] CR2: ffffffffffffffd6 CR3: 00000001adf8f000 CR4: 00000000001406e0 [ 38.606104] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 38.613484] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 38.620741] Call Trace: [ 38.623331] ? smc_poll+0x211/0xdd0 [ 38.626945] ? __mem_cgroup_threshold+0x720/0x720 [ 38.631781] ? __smc_connect+0xa90/0xa90 [ 38.635836] ? kvm_clock_read+0x25/0x30 [ 38.639807] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 38.645853] ? ktime_get_ts64+0x39d/0x510 [ 38.651113] ? do_gettimeofday+0x170/0x170 [ 38.655439] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.660971] ? __fget_light+0x2ef/0x430 [ 38.665515] sock_poll+0x1d1/0x710 [ 38.672179] ? __smc_connect+0xa90/0xa90 [ 38.677318] ? sock_get_poll_head+0x460/0x460 [ 38.681801] ? sock_get_poll_head+0x460/0x460 [ 38.686299] vfs_poll+0x77/0x2a0 [ 38.690793] do_sys_poll+0x6fd/0x1100 [ 38.694854] ? compat_core_sys_select+0xae0/0xae0 [ 38.700323] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 38.705339] ? graph_lock+0x170/0x170 [ 38.709298] ? graph_lock+0x170/0x170 [ 38.713269] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.718928] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.724448] ? __handle_mm_fault+0x93a/0x4390 [ 38.728927] ? find_held_lock+0x36/0x1c0 [ 38.732982] ? poll_initwait+0x180/0x180 [ 38.737045] ? pvclock_read_flags+0x160/0x160 [ 38.741631] ? ktime_get_ts64+0x405/0x510 [ 38.745867] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 38.750882] ? timespec64_add_safe+0x1f4/0x2d0 [ 38.755460] ? nsec_to_clock_t+0x30/0x30 [ 38.759516] ? do_gettimeofday+0x170/0x170 [ 38.763751] ? poll_select_set_timeout+0x14f/0x220 [ 38.768751] ? do_restart_poll+0x2d0/0x2d0 [ 38.772985] __x64_sys_poll+0x189/0x510 [ 38.777738] ? __ia32_sys_pselect6+0x270/0x270 [ 38.782314] ? do_syscall_64+0x92/0x800 [ 38.786284] do_syscall_64+0x1b1/0x800 [ 38.790161] ? syscall_return_slowpath+0x5c0/0x5c0 [ 38.795517] ? syscall_return_slowpath+0x30f/0x5c0 [ 38.800456] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.806017] ? retint_user+0x18/0x18 [ 38.809734] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 38.814564] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 38.819736] RIP: 0033:0x43fcc9 [ 38.822915] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 6b 45 00 00 c3 66 2e 0f 1f 84 00 00 00 00 [ 38.842153] RSP: 002b:00007fff1a15de78 EFLAGS: 00000213 ORIG_RAX: 0000000000000007 [ 38.850130] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fcc9 [ 38.857398] RDX: 0000000000000003 RSI: 0000000000000001 RDI: 0000000020000040 [ 38.864666] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 38.871931] R10: 00000000004002c8 R11: 0000000000000213 R12: 00000000004015f0 [ 38.879541] R13: 0000000000401680 R14: 0000000000000000 R15: 0000000000000000 [ 38.887935] Modules linked in: [ 38.891131] Dumping ftrace buffer: [ 38.894660] (ftrace buffer empty) [ 38.898364] CR2: 0000000000000000 [ 38.901986] ---[ end trace c434975af2f16aab ]--- [ 38.906757] RIP: 0010: (null) [ 38.912230] Code: Bad RIP value. [ 38.915625] RSP: 0018:ffff8801a8e3f590 EFLAGS: 00010246 [ 38.921029] RAX: 0000000000000000 RBX: ffff8801adb3b800 RCX: 1ffffffff10ea9fd [ 38.928316] RDX: ffff8801a8e3fab0 RSI: ffff8801a8ab9000 RDI: ffff8801d856ca40 [ 38.935772] RBP: ffff8801a8e3f700 R08: 0000000000000001 R09: 0000000000000000 [ 38.943054] R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff100351c7eb7 [ 38.950450] R13: ffff8801a8e3fab0 R14: ffff8801adb3b812 R15: ffff8801adb3bc58 [ 38.957843] FS: 0000000000b3b880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 38.966100] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.972025] CR2: ffffffffffffffd6 CR3: 00000001adf8f000 CR4: 00000000001406e0 [ 38.979671] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 38.987046] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 38.994771] Kernel panic - not syncing: Fatal exception [ 39.000613] Dumping ftrace buffer: [ 39.004142] (ftrace buffer empty) [ 39.007847] Kernel Offset: disabled [ 39.011459] Rebooting in 86400 seconds..