[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.048863] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.745960] random: sshd: uninitialized urandom read (32 bytes read) [ 22.998407] random: sshd: uninitialized urandom read (32 bytes read) [ 23.819680] random: sshd: uninitialized urandom read (32 bytes read) [ 23.986309] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.28' (ECDSA) to the list of known hosts. [ 29.567990] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.663222] 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. [ 29.682516] kasan: CONFIG_KASAN_INLINE enabled [ 29.687351] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 29.694779] general protection fault: 0000 [#1] SMP KASAN [ 29.700324] CPU: 0 PID: 4521 Comm: syz-executor593 Not tainted 4.18.0-rc3+ #135 [ 29.707754] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.717103] RIP: 0010:do_tcp_getsockopt.isra.43+0x2f9d/0x3c10 [ 29.722963] 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 [ 29.742115] RSP: 0018:ffff8801c8b77860 EFLAGS: 00010202 [ 29.747476] RAX: 0000000000000010 RBX: 0000000000000000 RCX: ffffffff8666514d [ 29.754724] RDX: 0000000000000000 RSI: dffffc0000000000 RDI: 0000000000000080 [ 29.761973] RBP: ffff8801c8b77c60 R08: ffff8801b25c81c0 R09: ffffed0036644777 [ 29.769232] R10: ffffed0036644777 R11: ffff8801b3223bbf R12: 0000000000001000 [ 29.776483] R13: 0000000000000000 R14: 0000000000000000 R15: ffff8801c8b779b0 [ 29.783746] FS: 0000000002675880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 29.791950] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.797809] CR2: 0000000020005000 CR3: 00000001b34b6000 CR4: 00000000001406f0 [ 29.805061] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.812310] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.819567] Call Trace: [ 29.822145] ? tcp_ioctl+0x730/0x730 [ 29.825839] ? tcp_disconnect+0x9d7/0x1490 [ 29.830063] ? graph_lock+0x170/0x170 [ 29.833841] ? graph_lock+0x170/0x170 [ 29.837625] ? tcp_disconnect+0xd6d/0x1490 [ 29.841853] ? release_sock+0x1ec/0x2c0 [ 29.845807] ? find_held_lock+0x36/0x1c0 [ 29.849850] ? lock_downgrade+0x8f0/0x8f0 [ 29.853977] ? lock_downgrade+0x8f0/0x8f0 [ 29.858111] ? kasan_check_read+0x11/0x20 [ 29.862248] ? do_raw_spin_unlock+0xa7/0x2f0 [ 29.866635] ? __local_bh_enable_ip+0x161/0x230 [ 29.871295] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.876290] ? release_sock+0x1ec/0x2c0 [ 29.880245] ? trace_hardirqs_on+0xd/0x10 [ 29.884372] ? __local_bh_enable_ip+0x161/0x230 [ 29.889041] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.894559] ? __fget_light+0x2f7/0x440 [ 29.898511] ? fget_raw+0x20/0x20 [ 29.901978] ? inet_stream_connect+0x7b/0xa0 [ 29.906463] tcp_getsockopt+0xc1/0xe0 [ 29.910243] ? tcp_getsockopt+0xc1/0xe0 [ 29.914202] sock_common_getsockopt+0x9a/0xe0 [ 29.918678] __sys_getsockopt+0x1ad/0x390 [ 29.922822] ? kernel_setsockopt+0x1d0/0x1d0 [ 29.927218] __x64_sys_getsockopt+0xbe/0x150 [ 29.931609] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.936610] do_syscall_64+0x1b9/0x820 [ 29.940564] ? syscall_slow_exit_work+0x500/0x500 [ 29.945388] ? syscall_return_slowpath+0x5e0/0x5e0 [ 29.950308] ? syscall_return_slowpath+0x31d/0x5e0 [ 29.955222] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 29.960568] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.965395] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 29.970566] RIP: 0033:0x440279 [ 29.973736] 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 [ 29.992855] RSP: 002b:00007ffe47b2e5c8 EFLAGS: 00000217 ORIG_RAX: 0000000000000037 [ 30.000554] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440279 [ 30.007805] RDX: 0000000000000023 RSI: 0000000000000006 RDI: 0000000000000003 [ 30.015055] RBP: 00000000006cb018 R08: 0000000020000040 R09: 0000000000000080 [ 30.022304] R10: 0000000020000000 R11: 0000000000000217 R12: 0000000000401b00 [ 30.029552] R13: 0000000000401b90 R14: 0000000000000000 R15: 0000000000000000 [ 30.036804] Modules linked in: [ 30.039986] Dumping ftrace buffer: [ 30.043502] (ftrace buffer empty) [ 30.047292] ---[ end trace 921586a967364432 ]--- [ 30.052096] RIP: 0010:do_tcp_getsockopt.isra.43+0x2f9d/0x3c10 [ 30.057993] 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 [ 30.077289] RSP: 0018:ffff8801c8b77860 EFLAGS: 00010202 [ 30.082692] RAX: 0000000000000010 RBX: 0000000000000000 RCX: ffffffff8666514d [ 30.089994] RDX: 0000000000000000 RSI: dffffc0000000000 RDI: 0000000000000080 [ 30.097285] RBP: ffff8801c8b77c60 R08: ffff8801b25c81c0 R09: ffffed0036644777 [ 30.104569] R10: ffffed0036644777 R11: ffff8801b3223bbf R12: 0000000000001000 [ 30.111860] R13: 0000000000000000 R14: 0000000000000000 R15: ffff8801c8b779b0 [ 30.119161] FS: 0000000002675880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 30.127407] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.133304] CR2: 0000000020005000 CR3: 00000001b34b6000 CR4: 00000000001406f0 [ 30.140610] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.147893] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.155196] Kernel panic - not syncing: Fatal exception [ 30.161085] Dumping ftrace buffer: [ 30.164614] (ftrace buffer empty) [ 30.168299] Kernel Offset: disabled [ 30.171905] Rebooting in 86400 seconds..