[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.944424] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.377139] random: sshd: uninitialized urandom read (32 bytes read) [ 26.862272] random: sshd: uninitialized urandom read (32 bytes read) [ 27.639599] random: sshd: uninitialized urandom read (32 bytes read) [ 27.799282] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.27' (ECDSA) to the list of known hosts. [ 33.326159] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 33.429486] WARNING: CPU: 0 PID: 4490 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 33.437912] Kernel panic - not syncing: panic_on_warn set ... [ 33.437912] [ 33.445258] CPU: 0 PID: 4490 Comm: syz-executor911 Not tainted 4.17.0-rc4+ #42 [ 33.452593] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.461923] Call Trace: [ 33.464508] dump_stack+0x1b9/0x294 [ 33.468117] ? dump_stack_print_info.cold.2+0x52/0x52 [ 33.473293] ? smc_unhash_sk+0x2d0/0x4a0 [ 33.477345] panic+0x22f/0x4de [ 33.480518] ? add_taint.cold.5+0x16/0x16 [ 33.484650] ? __warn.cold.8+0x148/0x1b3 [ 33.488693] ? __warn.cold.8+0x117/0x1b3 [ 33.492746] ? smc_unhash_sk+0x345/0x4a0 [ 33.496836] __warn.cold.8+0x163/0x1b3 [ 33.500722] ? smc_unhash_sk+0x345/0x4a0 [ 33.504765] report_bug+0x252/0x2d0 [ 33.508374] do_error_trap+0x1de/0x490 [ 33.512241] ? graph_lock+0x170/0x170 [ 33.516042] ? math_error+0x420/0x420 [ 33.519831] ? lock_acquire+0x1dc/0x520 [ 33.523802] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.528627] do_invalid_op+0x1b/0x20 [ 33.532321] invalid_op+0x14/0x20 [ 33.535756] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 33.540403] RSP: 0018:ffff8801d962f488 EFLAGS: 00010293 [ 33.545748] RAX: ffff8801acd0e1c0 RBX: ffff8801d0bfe7c0 RCX: ffffffff87404cbe [ 33.552998] RDX: 0000000000000000 RSI: ffffffff87404d75 RDI: 0000000000000005 [ 33.560257] RBP: ffff8801d962f570 R08: ffff8801acd0e1c0 R09: ffffed003a17fd08 [ 33.567509] R10: ffffed003a17fd08 R11: ffff8801d0bfe843 R12: 1ffff1003b2c5e95 [ 33.574759] R13: ffff8801d962f548 R14: ffffffff8970cc20 R15: ffff8801d0bfe840 [ 33.582034] ? smc_unhash_sk+0x28e/0x4a0 [ 33.586078] ? smc_unhash_sk+0x345/0x4a0 [ 33.590130] ? smc_unhash_sk+0x345/0x4a0 [ 33.594177] ? smc_rx_data_available+0x100/0x100 [ 33.598925] ? release_sock+0x1e2/0x2b0 [ 33.602884] ? __local_bh_enable_ip+0x161/0x230 [ 33.607545] ? __release_sock+0x3a0/0x3a0 [ 33.611689] ? smc_release+0x269/0x610 [ 33.615561] ? trace_hardirqs_on+0xd/0x10 [ 33.619701] ? __local_bh_enable_ip+0x161/0x230 [ 33.624351] smc_release+0x36e/0x610 [ 33.628062] sock_release+0x96/0x1b0 [ 33.631761] ? sock_alloc_file+0x4e0/0x4e0 [ 33.635994] sock_close+0x16/0x20 [ 33.639459] __fput+0x34d/0x890 [ 33.642753] ? fput+0x1a0/0x1a0 [ 33.646045] ? _raw_spin_unlock_irq+0x27/0x70 [ 33.650533] ____fput+0x15/0x20 [ 33.653794] task_work_run+0x1e4/0x290 [ 33.657676] ? task_work_cancel+0x240/0x240 [ 33.661980] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 33.667499] ? switch_task_namespaces+0xa2/0xd0 [ 33.672152] do_exit+0x1aee/0x2730 [ 33.675679] ? mm_update_next_owner+0x980/0x980 [ 33.680330] ? lock_downgrade+0x8e0/0x8e0 [ 33.684455] ? noop_count+0x40/0x40 [ 33.688061] ? lock_pin_lock+0x350/0x350 [ 33.692102] ? kasan_check_read+0x11/0x20 [ 33.696229] ? rcu_is_watching+0x85/0x140 [ 33.700358] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 33.705533] ? is_bpf_text_address+0xd7/0x170 [ 33.710018] ? check_usage_backwards+0x151/0x3a0 [ 33.714763] ? graph_lock+0x170/0x170 [ 33.718544] ? graph_lock+0x170/0x170 [ 33.722330] ? find_held_lock+0x36/0x1c0 [ 33.726378] ? lock_downgrade+0x8e0/0x8e0 [ 33.730507] ? kasan_check_read+0x11/0x20 [ 33.734635] ? do_raw_spin_unlock+0x9e/0x2e0 [ 33.739038] ? __local_bh_enable_ip+0x161/0x230 [ 33.743698] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 33.748708] ? release_sock+0x1e2/0x2b0 [ 33.752678] ? trace_hardirqs_on+0xd/0x10 [ 33.756807] ? __local_bh_enable_ip+0x161/0x230 [ 33.761457] ? _raw_spin_unlock_bh+0x30/0x40 [ 33.765848] ? release_sock+0x1e2/0x2b0 [ 33.769804] ? __release_sock+0x3a0/0x3a0 [ 33.773931] ? __local_bh_enable_ip+0x161/0x230 [ 33.778584] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 33.783767] ? smc_setsockopt+0x1ed/0x630 [ 33.787897] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.793415] ? __sys_setsockopt+0x24f/0x390 [ 33.797722] do_group_exit+0x16f/0x430 [ 33.801592] ? mm_fault_error+0x380/0x380 [ 33.805720] ? __ia32_sys_exit+0x50/0x50 [ 33.809769] ? do_syscall_64+0x92/0x800 [ 33.813744] __x64_sys_exit_group+0x3e/0x50 [ 33.818048] do_syscall_64+0x1b1/0x800 [ 33.821916] ? syscall_return_slowpath+0x5c0/0x5c0 [ 33.826845] ? syscall_return_slowpath+0x30f/0x5c0 [ 33.831759] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 33.837105] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.841939] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 33.847109] RIP: 0033:0x43e8b8 [ 33.850290] RSP: 002b:00007ffccd1586b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 33.857978] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8b8 [ 33.865228] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 33.872478] RBP: 00000000004be260 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 33.879727] R10: 00000000200002c0 R11: 0000000000000246 R12: 0000000000000001 [ 33.886975] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 33.894871] Dumping ftrace buffer: [ 33.898518] (ftrace buffer empty) [ 33.902218] Kernel Offset: disabled [ 33.905827] Rebooting in 86400 seconds..