[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.954416] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 20.576240] random: sshd: uninitialized urandom read (32 bytes read) [ 20.947523] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.755916] random: sshd: uninitialized urandom read (32 bytes read) [ 31.048988] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.30' (ECDSA) to the list of known hosts. [ 36.504068] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 36.608723] 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. [ 36.627738] kasan: CONFIG_KASAN_INLINE enabled [ 36.632504] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 36.639947] general protection fault: 0000 [#1] SMP KASAN [ 36.645489] CPU: 1 PID: 4567 Comm: syz-executor355 Not tainted 4.18.0-rc3+ #135 [ 36.652917] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.663465] RIP: 0010:do_tcp_getsockopt.isra.43+0x2f9d/0x3c10 [ 36.669334] Code: 3c 03 0f 8e 46 08 00 00 89 9d 10 fd ff ff e8 ea b9 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 [ 36.688577] RSP: 0018:ffff8801ce7f7860 EFLAGS: 00010202 [ 36.693946] RAX: 0000000000000010 RBX: 0000000000000000 RCX: ffffffff8666514d [ 36.701292] RDX: 0000000000000000 RSI: dffffc0000000000 RDI: 0000000000000080 [ 36.708573] RBP: ffff8801ce7f7c60 R08: ffff8801d8e5c400 R09: ffffed0038d77507 [ 36.715852] R10: ffffed0038d77507 R11: ffff8801c6bba83f R12: 0000000000001000 [ 36.723199] R13: 0000000000000000 R14: 0000000000000000 R15: ffff8801ce7f79b0 [ 36.730469] FS: 000000000168d880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 36.738709] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.744591] CR2: 0000000020005000 CR3: 00000001d8e92000 CR4: 00000000001406e0 [ 36.751962] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 36.759239] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 36.766516] Call Trace: [ 36.769109] ? tcp_ioctl+0x730/0x730 [ 36.772830] ? tcp_disconnect+0x9d7/0x1490 [ 36.777063] ? graph_lock+0x170/0x170 [ 36.780865] ? graph_lock+0x170/0x170 [ 36.784660] ? tcp_disconnect+0xd6d/0x1490 [ 36.788910] ? release_sock+0x1ec/0x2c0 [ 36.792890] ? find_held_lock+0x36/0x1c0 [ 36.796955] ? lock_downgrade+0x8f0/0x8f0 [ 36.801089] ? lock_downgrade+0x8f0/0x8f0 [ 36.805242] ? kasan_check_read+0x11/0x20 [ 36.809437] ? do_raw_spin_unlock+0xa7/0x2f0 [ 36.814033] ? __local_bh_enable_ip+0x161/0x230 [ 36.818693] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 36.824148] ? release_sock+0x1ec/0x2c0 [ 36.828125] ? trace_hardirqs_on+0xd/0x10 [ 36.832257] ? __local_bh_enable_ip+0x161/0x230 [ 36.836912] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.842434] ? __fget_light+0x2f7/0x440 [ 36.846410] ? fget_raw+0x20/0x20 [ 36.849877] ? inet_stream_connect+0x7b/0xa0 [ 36.854288] tcp_getsockopt+0xc1/0xe0 [ 36.858078] ? tcp_getsockopt+0xc1/0xe0 [ 36.862067] sock_common_getsockopt+0x9a/0xe0 [ 36.866556] __sys_getsockopt+0x1ad/0x390 [ 36.870700] ? kernel_setsockopt+0x1d0/0x1d0 [ 36.875119] __x64_sys_getsockopt+0xbe/0x150 [ 36.879524] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 36.884549] do_syscall_64+0x1b9/0x820 [ 36.888430] ? syscall_return_slowpath+0x5e0/0x5e0 [ 36.893385] ? syscall_return_slowpath+0x31d/0x5e0 [ 36.898312] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 36.903684] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 36.908540] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 36.913748] RIP: 0033:0x440279 [ 36.916949] 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 [ 36.936110] RSP: 002b:00007ffd8006ea18 EFLAGS: 00000217 ORIG_RAX: 0000000000000037 [ 36.943840] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440279 [ 36.951113] RDX: 0000000000000023 RSI: 0000000000000006 RDI: 0000000000000003 [ 36.958372] RBP: 00000000006cb018 R08: 0000000020000040 R09: 0000000000000080 [ 36.965631] R10: 0000000020000000 R11: 0000000000000217 R12: 0000000000401b00 [ 36.972897] R13: 0000000000401b90 R14: 0000000000000000 R15: 0000000000000000 [ 36.980176] Modules linked in: [ 36.983379] Dumping ftrace buffer: [ 36.986901] (ftrace buffer empty) [ 36.990707] ---[ end trace 8eb7b4e3bf25acb4 ]--- [ 36.995519] RIP: 0010:do_tcp_getsockopt.isra.43+0x2f9d/0x3c10 [ 37.001482] Code: 3c 03 0f 8e 46 08 00 00 89 9d 10 fd ff ff e8 ea b9 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 [ 37.020735] RSP: 0018:ffff8801ce7f7860 EFLAGS: 00010202 [ 37.026274] RAX: 0000000000000010 RBX: 0000000000000000 RCX: ffffffff8666514d [ 37.033674] RDX: 0000000000000000 RSI: dffffc0000000000 RDI: 0000000000000080 [ 37.040985] RBP: ffff8801ce7f7c60 R08: ffff8801d8e5c400 R09: ffffed0038d77507 [ 37.048429] R10: ffffed0038d77507 R11: ffff8801c6bba83f R12: 0000000000001000 [ 37.055736] R13: 0000000000000000 R14: 0000000000000000 R15: ffff8801ce7f79b0 [ 37.063057] FS: 000000000168d880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 37.071317] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 37.077226] CR2: 0000000020005000 CR3: 00000001d8e92000 CR4: 00000000001406e0 [ 37.084703] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 37.092027] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 37.099409] Kernel panic - not syncing: Fatal exception [ 37.104930] Dumping ftrace buffer: [ 37.108652] (ftrace buffer empty) [ 37.112519] Kernel Offset: disabled [ 37.116132] Rebooting in 86400 seconds..