[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.566007] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.221547] random: sshd: uninitialized urandom read (32 bytes read) [ 23.495529] random: sshd: uninitialized urandom read (32 bytes read) [ 24.386265] random: sshd: uninitialized urandom read (32 bytes read) [ 24.546447] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.14' (ECDSA) to the list of known hosts. [ 30.087503] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program executing program [ 30.253380] kasan: CONFIG_KASAN_INLINE enabled [ 30.258149] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 30.265548] general protection fault: 0000 [#1] SMP KASAN [ 30.271094] CPU: 0 PID: 4534 Comm: syz-executor006 Not tainted 4.18.0-rc3+ #11 [ 30.278436] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.287828] RIP: 0010:bpf_tcp_close+0x959/0x1070 [ 30.292573] Code: 85 38 06 00 00 48 8d 95 18 ff ff ff 49 8b 4c 24 18 48 89 d6 48 c1 ee 03 c6 04 1e 00 48 89 ce 48 c1 ee 03 48 89 85 18 ff ff ff <80> 3c 1e 00 0f 85 d2 05 00 00 48 c1 ea 03 48 85 c0 48 89 01 48 89 [ 30.311783] RSP: 0018:ffff8801ac07f950 EFLAGS: 00010a02 [ 30.317164] RAX: 0000000000000000 RBX: dffffc0000000000 RCX: dead000000000200 [ 30.324426] RDX: ffff8801ac07fa40 RSI: 1bd5a00000000040 RDI: ffff8801cdce7110 [ 30.331692] RBP: ffff8801ac07fb28 R08: ffff8801d8fb0280 R09: ffffed0039b9ce41 [ 30.338964] R10: ffffed0039b9ce41 R11: ffff8801cdce720b R12: ffff8801cdce7100 [ 30.346234] R13: ffff8801d9321780 R14: ffff8801cdce7208 R15: ffff8801cdce7118 [ 30.353517] FS: 0000000001bfe880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 30.361749] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.367625] CR2: 00007fbb357e8e78 CR3: 00000001d93a5000 CR4: 00000000001406f0 [ 30.374900] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.382186] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.389442] Call Trace: [ 30.392045] ? tcp_check_oom+0x530/0x530 [ 30.396203] ? smap_parse_func_strparser+0x590/0x590 [ 30.401318] ? lock_acquire+0x1e4/0x540 [ 30.405280] ? __sock_release+0x8b/0x260 [ 30.409335] ? lock_release+0xa30/0xa30 [ 30.413295] ? rcu_note_context_switch+0x730/0x730 [ 30.418219] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.423753] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.429287] ? ipv6_sock_ac_close+0x356/0x490 [ 30.433776] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 30.439305] ? ipv6_sock_mc_close+0x162/0x1d0 [ 30.443787] ? ip_mc_drop_socket+0x20f/0x270 [ 30.448197] ? down_write+0x8f/0x130 [ 30.451908] inet_release+0x104/0x1f0 [ 30.455702] inet6_release+0x50/0x70 [ 30.459417] __sock_release+0xd7/0x260 [ 30.463298] ? __sock_release+0x260/0x260 [ 30.468001] sock_close+0x19/0x20 [ 30.471456] __fput+0x355/0x8b0 [ 30.474741] ? fput+0x1a0/0x1a0 [ 30.478014] ? _raw_spin_unlock_irq+0x27/0x70 [ 30.482500] ____fput+0x15/0x20 [ 30.485777] task_work_run+0x1ec/0x2a0 [ 30.489676] ? task_work_cancel+0x250/0x250 [ 30.494006] ? exit_to_usermode_loop+0x8c/0x370 [ 30.498684] exit_to_usermode_loop+0x313/0x370 [ 30.503260] ? syscall_slow_exit_work+0x500/0x500 [ 30.508092] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.513616] do_syscall_64+0x6be/0x820 [ 30.517489] ? syscall_return_slowpath+0x5e0/0x5e0 [ 30.522422] ? syscall_return_slowpath+0x31d/0x5e0 [ 30.527358] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 30.532712] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.537556] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.542750] RIP: 0033:0x405781 [ 30.546484] Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 54 17 00 00 c3 48 83 ec 08 e8 6a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 b3 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 [ 30.565643] RSP: 002b:00007ffe595a8810 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 30.573346] RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000405781 [ 30.580601] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000004 [ 30.587861] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 30.595117] R10: 0000000000000000 R11: 0000000000000293 R12: 000000000000760e [ 30.602381] R13: 00000000004073d0 R14: 0000000000000000 R15: 0000000000000000 [ 30.609642] Modules linked in: [ 30.612829] Dumping ftrace buffer: [ 30.616353] (ftrace buffer empty) [ 30.620095] ---[ end trace 75250f64b9c79a1c ]--- [ 30.624958] RIP: 0010:bpf_tcp_close+0x959/0x1070 [ 30.629721] Code: 85 38 06 00 00 48 8d 95 18 ff ff ff 49 8b 4c 24 18 48 89 d6 48 c1 ee 03 c6 04 1e 00 48 89 ce 48 c1 ee 03 48 89 85 18 ff ff ff <80> 3c 1e 00 0f 85 d2 05 00 00 48 c1 ea 03 48 85 c0 48 89 01 48 89 [ 30.649032] RSP: 0018:ffff8801ac07f950 EFLAGS: 00010a02 [ 30.654412] RAX: 0000000000000000 RBX: dffffc0000000000 RCX: dead000000000200 [ 30.661696] RDX: ffff8801ac07fa40 RSI: 1bd5a00000000040 RDI: ffff8801cdce7110 [ 30.668983] RBP: ffff8801ac07fb28 R08: ffff8801d8fb0280 R09: ffffed0039b9ce41 [ 30.676295] R10: ffffed0039b9ce41 R11: ffff8801cdce720b R12: ffff8801cdce7100 [ 30.683593] R13: ffff8801d9321780 R14: ffff8801cdce7208 R15: ffff8801cdce7118 [ 30.690895] FS: 0000000001bfe880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 30.699155] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.705070] CR2: 00007fbb357e8e78 CR3: 00000001d93a5000 CR4: 00000000001406f0 [ 30.712449] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.719731] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.727032] Kernel panic - not syncing: Fatal exception in interrupt [ 30.734101] Dumping ftrace buffer: [ 30.737639] (ftrace buffer empty) [ 30.741353] Kernel Offset: disabled [ 30.744979] Rebooting in 86400 seconds..