[....] Starting OpenBSD Secure Shell server: sshd[ 20.387441] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.898298] random: sshd: uninitialized urandom read (32 bytes read) [ 25.244946] sshd (4496) used greatest stack depth: 16184 bytes left [ 25.266244] random: sshd: uninitialized urandom read (32 bytes read) [ 26.074448] random: sshd: uninitialized urandom read (32 bytes read) [ 26.236478] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.50' (ECDSA) to the list of known hosts. [ 31.644989] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.744976] WARNING: CPU: 0 PID: 4513 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 31.753401] Kernel panic - not syncing: panic_on_warn set ... [ 31.753401] [ 31.760760] CPU: 0 PID: 4513 Comm: syz-executor281 Not tainted 4.17.0-rc4+ #41 [ 31.768116] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.777458] Call Trace: [ 31.780044] dump_stack+0x1b9/0x294 [ 31.783661] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.788837] ? smc_unhash_sk+0x2d0/0x4a0 [ 31.792882] panic+0x22f/0x4de [ 31.796063] ? add_taint.cold.5+0x16/0x16 [ 31.800205] ? __warn.cold.8+0x148/0x1b3 [ 31.804249] ? __warn.cold.8+0x117/0x1b3 [ 31.808295] ? smc_unhash_sk+0x345/0x4a0 [ 31.812341] __warn.cold.8+0x163/0x1b3 [ 31.816218] ? smc_unhash_sk+0x345/0x4a0 [ 31.820273] report_bug+0x252/0x2d0 [ 31.823886] do_error_trap+0x1de/0x490 [ 31.827759] ? graph_lock+0x170/0x170 [ 31.831546] ? math_error+0x420/0x420 [ 31.835335] ? lock_acquire+0x1dc/0x520 [ 31.839293] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.844123] do_invalid_op+0x1b/0x20 [ 31.847839] invalid_op+0x14/0x20 [ 31.851318] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 31.855986] RSP: 0018:ffff8801ac5ff488 EFLAGS: 00010293 [ 31.861344] RAX: ffff8801d8da21c0 RBX: ffff8801d96b17c0 RCX: ffffffff87404cbe [ 31.868598] RDX: 0000000000000000 RSI: ffffffff87404d75 RDI: 0000000000000005 [ 31.875848] RBP: ffff8801ac5ff570 R08: ffff8801d8da21c0 R09: ffffed003b2d6308 [ 31.883110] R10: ffffed003b2d6308 R11: ffff8801d96b1843 R12: 1ffff100358bfe95 [ 31.890366] R13: ffff8801ac5ff548 R14: ffffffff8970cc20 R15: ffff8801d96b1840 [ 31.897635] ? smc_unhash_sk+0x28e/0x4a0 [ 31.901693] ? smc_unhash_sk+0x345/0x4a0 [ 31.905748] ? smc_unhash_sk+0x345/0x4a0 [ 31.909799] ? smc_rx_data_available+0x100/0x100 [ 31.914538] ? release_sock+0x1e2/0x2b0 [ 31.918506] ? __local_bh_enable_ip+0x161/0x230 [ 31.923170] ? __release_sock+0x3a0/0x3a0 [ 31.927330] ? smc_release+0x269/0x610 [ 31.931218] ? trace_hardirqs_on+0xd/0x10 [ 31.935363] ? __local_bh_enable_ip+0x161/0x230 [ 31.940029] smc_release+0x36e/0x610 [ 31.943734] sock_release+0x96/0x1b0 [ 31.947431] ? sock_alloc_file+0x4e0/0x4e0 [ 31.951646] sock_close+0x16/0x20 [ 31.955088] __fput+0x34d/0x890 [ 31.958351] ? fput+0x1a0/0x1a0 [ 31.961613] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.966101] ____fput+0x15/0x20 [ 31.969366] task_work_run+0x1e4/0x290 [ 31.973236] ? task_work_cancel+0x240/0x240 [ 31.977545] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 31.983073] ? switch_task_namespaces+0xa2/0xd0 [ 31.987738] do_exit+0x1aee/0x2730 [ 31.991268] ? mm_update_next_owner+0x980/0x980 [ 31.995927] ? lock_downgrade+0x8e0/0x8e0 [ 32.000059] ? noop_count+0x40/0x40 [ 32.003685] ? lock_pin_lock+0x350/0x350 [ 32.007872] ? kasan_check_read+0x11/0x20 [ 32.012013] ? rcu_is_watching+0x85/0x140 [ 32.016161] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 32.021344] ? is_bpf_text_address+0xd7/0x170 [ 32.025825] ? check_usage_backwards+0x151/0x3a0 [ 32.030563] ? graph_lock+0x170/0x170 [ 32.034345] ? graph_lock+0x170/0x170 [ 32.038133] ? find_held_lock+0x36/0x1c0 [ 32.042192] ? lock_downgrade+0x8e0/0x8e0 [ 32.046327] ? kasan_check_read+0x11/0x20 [ 32.050472] ? do_raw_spin_unlock+0x9e/0x2e0 [ 32.054881] ? __local_bh_enable_ip+0x161/0x230 [ 32.059536] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 32.064540] ? release_sock+0x1e2/0x2b0 [ 32.068505] ? trace_hardirqs_on+0xd/0x10 [ 32.072646] ? __local_bh_enable_ip+0x161/0x230 [ 32.077299] ? _raw_spin_unlock_bh+0x30/0x40 [ 32.081690] ? release_sock+0x1e2/0x2b0 [ 32.085647] ? __release_sock+0x3a0/0x3a0 [ 32.089779] ? __local_bh_enable_ip+0x161/0x230 [ 32.094439] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 32.099615] ? smc_setsockopt+0x1ed/0x630 [ 32.103750] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.109272] ? __sys_setsockopt+0x24f/0x390 [ 32.113581] do_group_exit+0x16f/0x430 [ 32.117451] ? mm_fault_error+0x380/0x380 [ 32.121584] ? __ia32_sys_exit+0x50/0x50 [ 32.125633] ? do_syscall_64+0x92/0x800 [ 32.129591] __x64_sys_exit_group+0x3e/0x50 [ 32.133893] do_syscall_64+0x1b1/0x800 [ 32.137765] ? syscall_return_slowpath+0x5c0/0x5c0 [ 32.142679] ? syscall_return_slowpath+0x30f/0x5c0 [ 32.147600] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 32.152951] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.157781] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 32.162954] RIP: 0033:0x43e8b8 [ 32.166125] RSP: 002b:00007ffff3208a78 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 32.173817] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8b8 [ 32.181078] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 32.188333] RBP: 00000000004be260 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 32.195598] R10: 0000000020000940 R11: 0000000000000246 R12: 0000000000000001 [ 32.202861] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 32.210819] Dumping ftrace buffer: [ 32.214501] (ftrace buffer empty) [ 32.218201] Kernel Offset: disabled [ 32.221827] Rebooting in 86400 seconds..