[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.072200] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.967663] random: sshd: uninitialized urandom read (32 bytes read) [ 23.411428] random: sshd: uninitialized urandom read (32 bytes read) [ 24.218073] random: sshd: uninitialized urandom read (32 bytes read) [ 24.377111] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.41' (ECDSA) to the list of known hosts. [ 29.845363] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.934648] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 [ 29.942637] PGD 1afd3a067 P4D 1afd3a067 PUD 1ae18b067 PMD 0 [ 29.948426] Oops: 0010 [#1] SMP KASAN [ 29.952202] CPU: 0 PID: 4515 Comm: syz-executor226 Not tainted 4.17.0+ #92 [ 29.959188] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.968517] RIP: 0010: (null) [ 29.972376] Code: Bad RIP value. [ 29.975733] RSP: 0018:ffff8801cec67590 EFLAGS: 00010246 [ 29.981074] RAX: 0000000000000000 RBX: ffff8801ad1e6800 RCX: 1ffffffff10ea8e5 [ 29.988326] RDX: ffff8801cec67ab0 RSI: ffff8801a8eb9940 RDI: ffff8801ad7087c0 [ 29.995570] RBP: ffff8801cec67700 R08: 0000000000000001 R09: 0000000000000000 [ 30.002816] R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff10039d8ceb7 [ 30.010155] R13: ffff8801cec67ab0 R14: ffff8801ad1e6812 R15: ffff8801ad1e6c58 [ 30.017404] FS: 00000000023b0880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 30.025617] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.031475] CR2: ffffffffffffffd6 CR3: 00000001ae403000 CR4: 00000000001406f0 [ 30.038730] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.045983] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.053242] Call Trace: [ 30.055818] ? smc_poll+0x211/0xdd0 [ 30.059422] ? __mem_cgroup_threshold+0x720/0x720 [ 30.064252] ? __smc_connect+0xa90/0xa90 [ 30.068291] ? kvm_clock_read+0x25/0x30 [ 30.072259] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 30.077771] ? ktime_get_ts64+0x39d/0x510 [ 30.081900] ? do_gettimeofday+0x170/0x170 [ 30.086115] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.091636] ? __fget_light+0x2ef/0x430 [ 30.095589] sock_poll+0x1d1/0x710 [ 30.099111] ? __smc_connect+0xa90/0xa90 [ 30.103149] ? sock_get_poll_head+0x460/0x460 [ 30.107621] ? sock_get_poll_head+0x460/0x460 [ 30.112092] vfs_poll+0x77/0x2a0 [ 30.115438] do_sys_poll+0x6fd/0x1100 [ 30.119219] ? compat_core_sys_select+0xae0/0xae0 [ 30.124048] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.129129] ? graph_lock+0x170/0x170 [ 30.132906] ? graph_lock+0x170/0x170 [ 30.136683] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.142197] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.147710] ? __handle_mm_fault+0x93a/0x4390 [ 30.152181] ? find_held_lock+0x36/0x1c0 [ 30.156221] ? poll_initwait+0x180/0x180 [ 30.160268] ? pvclock_read_flags+0x160/0x160 [ 30.164742] ? ktime_get_ts64+0x405/0x510 [ 30.168875] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 30.173877] ? timespec64_add_safe+0x1f4/0x2d0 [ 30.178439] ? nsec_to_clock_t+0x30/0x30 [ 30.182479] ? do_gettimeofday+0x170/0x170 [ 30.186697] ? poll_select_set_timeout+0x14f/0x220 [ 30.191612] ? do_restart_poll+0x2d0/0x2d0 [ 30.195836] __x64_sys_poll+0x189/0x510 [ 30.199797] ? __ia32_sys_pselect6+0x270/0x270 [ 30.204365] ? do_syscall_64+0x92/0x800 [ 30.208323] do_syscall_64+0x1b1/0x800 [ 30.212187] ? syscall_return_slowpath+0x5c0/0x5c0 [ 30.217095] ? syscall_return_slowpath+0x30f/0x5c0 [ 30.222018] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.227536] ? retint_user+0x18/0x18 [ 30.231228] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.236068] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.241233] RIP: 0033:0x43fcc9 [ 30.244397] 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 [ 30.263507] RSP: 002b:00007fff7a9c9b68 EFLAGS: 00000213 ORIG_RAX: 0000000000000007 [ 30.271203] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fcc9 [ 30.278453] RDX: 0000000000000003 RSI: 0000000000000001 RDI: 0000000020000040 [ 30.285701] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 30.292947] R10: 00000000004002c8 R11: 0000000000000213 R12: 00000000004015f0 [ 30.300191] R13: 0000000000401680 R14: 0000000000000000 R15: 0000000000000000 [ 30.307440] Modules linked in: [ 30.310612] Dumping ftrace buffer: [ 30.314126] (ftrace buffer empty) [ 30.317813] CR2: 0000000000000000 [ 30.321319] ---[ end trace 8702dcc08211f51e ]--- [ 30.326090] RIP: 0010: (null) [ 30.329990] Code: Bad RIP value. [ 30.333379] RSP: 0018:ffff8801cec67590 EFLAGS: 00010246 [ 30.338739] RAX: 0000000000000000 RBX: ffff8801ad1e6800 RCX: 1ffffffff10ea8e5 [ 30.346030] RDX: ffff8801cec67ab0 RSI: ffff8801a8eb9940 RDI: ffff8801ad7087c0 [ 30.353306] RBP: ffff8801cec67700 R08: 0000000000000001 R09: 0000000000000000 [ 30.360591] R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff10039d8ceb7 [ 30.367860] R13: ffff8801cec67ab0 R14: ffff8801ad1e6812 R15: ffff8801ad1e6c58 [ 30.375136] FS: 00000000023b0880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 30.383360] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.389239] CR2: ffffffffffffffd6 CR3: 00000001ae403000 CR4: 00000000001406f0 [ 30.396511] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.403781] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.411054] Kernel panic - not syncing: Fatal exception [ 30.416818] Dumping ftrace buffer: [ 30.420340] (ftrace buffer empty) [ 30.424026] Kernel Offset: disabled [ 30.427628] Rebooting in 86400 seconds..