[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.783615] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 17.144309] random: sshd: uninitialized urandom read (32 bytes read) [ 17.439148] random: sshd: uninitialized urandom read (32 bytes read) [ 18.100738] random: sshd: uninitialized urandom read (32 bytes read) [ 18.242946] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.13' (ECDSA) to the list of known hosts. [ 23.679336] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 23.761488] nf_conntrack: default automatic helper assignment has been turned off for security reasons and CT-based firewall rule not found. Use the iptables CT target to attach helpers instead. [ 23.779623] kasan: CONFIG_KASAN_INLINE enabled [ 23.784232] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 23.791608] general protection fault: 0000 [#1] SMP KASAN [ 23.797172] CPU: 0 PID: 4451 Comm: syz-executor536 Not tainted 4.18.0-rc3+ #111 [ 23.804595] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 23.813943] RIP: 0010:do_tcp_getsockopt.isra.43+0x2f9d/0x3c10 [ 23.819806] Code: 3c 03 0f 8e 46 08 00 00 89 9d 10 fd ff ff e8 7a 2a 15 fb 49 8d be 80 00 00 00 be ff ff 37 00 48 89 f8 48 c1 e6 2a 48 c1 e8 03 <0f> b6 04 30 84 c0 74 08 3c 03 0f 8e cd 06 00 00 48 8b 85 50 fc ff [ 23.838924] RSP: 0018:ffff8801ca707860 EFLAGS: 00010202 [ 23.844279] RAX: 0000000000000010 RBX: 0000000000000000 RCX: ffffffff8666e0bd [ 23.851534] RDX: 0000000000000000 RSI: dffffc0000000000 RDI: 0000000000000080 [ 23.858785] RBP: ffff8801ca707c60 R08: ffff8801af56a700 R09: ffffed0035986cef [ 23.866041] R10: ffffed0035986cef R11: ffff8801acc3677f R12: 0000000000001000 [ 23.873301] R13: 0000000000000000 R14: 0000000000000000 R15: ffff8801ca7079b0 [ 23.880564] FS: 0000000001473880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 23.888781] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 23.894648] CR2: 0000000020005000 CR3: 00000001c7934000 CR4: 00000000001406f0 [ 23.901903] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 23.909157] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 23.916415] Call Trace: [ 23.918993] ? tcp_ioctl+0x730/0x730 [ 23.922695] ? tcp_disconnect+0xda1/0x14d0 [ 23.926911] ? release_sock+0x1ec/0x2c0 [ 23.930882] ? tcp_write_queue_purge+0x8b0/0x8b0 [ 23.935621] ? _raw_spin_unlock_bh+0x30/0x40 [ 23.940019] ? kasan_check_write+0x14/0x20 [ 23.944262] ? __release_sock+0x3a0/0x3a0 [ 23.948389] ? release_sock+0x1ec/0x2c0 [ 23.952353] ? lock_downgrade+0x8f0/0x8f0 [ 23.956480] ? lock_downgrade+0x8f0/0x8f0 [ 23.960612] ? kasan_check_read+0x11/0x20 [ 23.964742] ? do_raw_spin_unlock+0xa7/0x2f0 [ 23.969220] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 23.973786] ? release_sock+0x1ec/0x2c0 [ 23.977741] ? trace_hardirqs_on+0xd/0x10 [ 23.981869] ? __local_bh_enable_ip+0x161/0x230 [ 23.986531] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 23.992051] ? __fget_light+0x2f7/0x440 [ 23.996702] ? fget_raw+0x20/0x20 [ 24.000154] ? inet_stream_connect+0x7b/0xa0 [ 24.004545] tcp_getsockopt+0xc1/0xe0 [ 24.008358] ? tcp_getsockopt+0xc1/0xe0 [ 24.012332] sock_common_getsockopt+0x9a/0xe0 [ 24.016814] __sys_getsockopt+0x1ad/0x390 [ 24.020946] ? kernel_setsockopt+0x1d0/0x1d0 [ 24.025343] __x64_sys_getsockopt+0xbe/0x150 [ 24.029822] do_syscall_64+0x1b9/0x820 [ 24.033701] ? syscall_slow_exit_work+0x500/0x500 [ 24.038538] ? syscall_return_slowpath+0x5e0/0x5e0 [ 24.043454] ? syscall_return_slowpath+0x31d/0x5e0 [ 24.048374] ? prepare_exit_to_usermode+0x291/0x3b0 [ 24.053379] ? perf_trace_sys_enter+0xb10/0xb10 [ 24.058037] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 24.062871] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 24.069002] RIP: 0033:0x440279 [ 24.072181] 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 24.091306] RSP: 002b:00007ffdb881c688 EFLAGS: 00000217 ORIG_RAX: 0000000000000037 [ 24.099027] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440279 [ 24.106296] RDX: 0000000000000023 RSI: 0000000000000006 RDI: 0000000000000003 [ 24.113646] RBP: 00000000006cb018 R08: 0000000020000040 R09: 0000000000000080 [ 24.120902] R10: 0000000020000000 R11: 0000000000000217 R12: 0000000000401b00 [ 24.128150] R13: 0000000000401b90 R14: 0000000000000000 R15: 0000000000000000 [ 24.135410] Modules linked in: [ 24.139434] Dumping ftrace buffer: [ 24.142951] (ftrace buffer empty) [ 24.146695] ---[ end trace 48d579526c009a12 ]--- [ 24.151466] RIP: 0010:do_tcp_getsockopt.isra.43+0x2f9d/0x3c10 [ 24.157347] Code: 3c 03 0f 8e 46 08 00 00 89 9d 10 fd ff ff e8 7a 2a 15 fb 49 8d be 80 00 00 00 be ff ff 37 00 48 89 f8 48 c1 e6 2a 48 c1 e8 03 <0f> b6 04 30 84 c0 74 08 3c 03 0f 8e cd 06 00 00 48 8b 85 50 fc ff [ 24.176601] RSP: 0018:ffff8801ca707860 EFLAGS: 00010202 [ 24.182025] RAX: 0000000000000010 RBX: 0000000000000000 RCX: ffffffff8666e0bd [ 24.189311] RDX: 0000000000000000 RSI: dffffc0000000000 RDI: 0000000000000080 [ 24.196589] RBP: ffff8801ca707c60 R08: ffff8801af56a700 R09: ffffed0035986cef [ 24.203871] R10: ffffed0035986cef R11: ffff8801acc3677f R12: 0000000000001000 [ 24.211172] R13: 0000000000000000 R14: 0000000000000000 R15: ffff8801ca7079b0 [ 24.218473] FS: 0000000001473880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 24.226735] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 24.232624] CR2: 0000000020005000 CR3: 00000001c7934000 CR4: 00000000001406f0 [ 24.239913] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 24.247198] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 24.254486] Kernel panic - not syncing: Fatal exception [ 24.260575] Dumping ftrace buffer: [ 24.264109] (ftrace buffer empty) [ 24.267806] Kernel Offset: disabled [ 24.271411] Rebooting in 86400 seconds..