[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.056697] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.182523] random: sshd: uninitialized urandom read (32 bytes read) [ 24.474936] random: sshd: uninitialized urandom read (32 bytes read) [ 25.236213] random: sshd: uninitialized urandom read (32 bytes read) [ 42.753142] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.2' (ECDSA) to the list of known hosts. [ 48.231872] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 48.321410] WARNING: CPU: 1 PID: 4505 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 48.329810] Kernel panic - not syncing: panic_on_warn set ... [ 48.329810] [ 48.337163] CPU: 1 PID: 4505 Comm: syz-executor775 Not tainted 4.17.0-rc3+ #33 [ 48.344506] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.353844] Call Trace: [ 48.356422] dump_stack+0x1b9/0x294 [ 48.360035] ? dump_stack_print_info.cold.2+0x52/0x52 [ 48.365214] ? smc_unhash_sk+0x270/0x4a0 [ 48.369614] panic+0x22f/0x4de [ 48.372792] ? add_taint.cold.5+0x16/0x16 [ 48.376925] ? __warn.cold.8+0x148/0x1b3 [ 48.380984] ? __warn.cold.8+0x117/0x1b3 [ 48.385034] ? smc_unhash_sk+0x345/0x4a0 [ 48.389077] __warn.cold.8+0x163/0x1b3 [ 48.392950] ? smc_unhash_sk+0x345/0x4a0 [ 48.396994] report_bug+0x252/0x2d0 [ 48.400605] do_error_trap+0x1de/0x490 [ 48.404474] ? graph_lock+0x170/0x170 [ 48.408271] ? math_error+0x420/0x420 [ 48.412059] ? lock_acquire+0x1dc/0x520 [ 48.416023] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 48.420850] do_invalid_op+0x1b/0x20 [ 48.424550] invalid_op+0x14/0x20 [ 48.427999] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 48.432647] RSP: 0018:ffff8801ad05f488 EFLAGS: 00010293 [ 48.437992] RAX: ffff8801adbe0340 RBX: ffff8801d95fa7c0 RCX: ffffffff873fe71e [ 48.445244] RDX: 0000000000000000 RSI: ffffffff873fe7d5 RDI: 0000000000000005 [ 48.452499] RBP: ffff8801ad05f570 R08: ffff8801adbe0340 R09: ffffed003b2bf508 [ 48.459755] R10: ffffed003b2bf508 R11: ffff8801d95fa843 R12: 1ffff10035a0be95 [ 48.467006] R13: ffff8801ad05f548 R14: ffffffff8970e4e0 R15: ffff8801d95fa840 [ 48.474273] ? smc_unhash_sk+0x28e/0x4a0 [ 48.478320] ? smc_unhash_sk+0x345/0x4a0 [ 48.482366] ? smc_unhash_sk+0x345/0x4a0 [ 48.486411] ? smc_rx_data_available+0x100/0x100 [ 48.491151] ? release_sock+0x1e2/0x2b0 [ 48.495111] ? __local_bh_enable_ip+0x161/0x230 [ 48.499766] ? __release_sock+0x3a0/0x3a0 [ 48.503897] ? smc_release+0x269/0x610 [ 48.507774] ? trace_hardirqs_on+0xd/0x10 [ 48.511906] ? __local_bh_enable_ip+0x161/0x230 [ 48.516564] smc_release+0x36e/0x610 [ 48.520268] sock_release+0x96/0x1b0 [ 48.523968] ? sock_alloc_file+0x4e0/0x4e0 [ 48.528186] sock_close+0x16/0x20 [ 48.531624] __fput+0x34d/0x890 [ 48.534890] ? fput+0x1a0/0x1a0 [ 48.538157] ? _raw_spin_unlock_irq+0x27/0x70 [ 48.542640] ____fput+0x15/0x20 [ 48.545905] task_work_run+0x1e4/0x290 [ 48.549779] ? task_work_cancel+0x240/0x240 [ 48.554087] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 48.559610] ? switch_task_namespaces+0xa2/0xd0 [ 48.564265] do_exit+0x1aee/0x2730 [ 48.567793] ? mm_update_next_owner+0x980/0x980 [ 48.572619] ? lock_downgrade+0x8e0/0x8e0 [ 48.576750] ? noop_count+0x40/0x40 [ 48.580359] ? lock_pin_lock+0x350/0x350 [ 48.584407] ? kasan_check_read+0x11/0x20 [ 48.588554] ? rcu_is_watching+0x85/0x140 [ 48.592687] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 48.597864] ? is_bpf_text_address+0xd7/0x170 [ 48.602344] ? check_usage_backwards+0x151/0x3a0 [ 48.607084] ? graph_lock+0x170/0x170 [ 48.610868] ? graph_lock+0x170/0x170 [ 48.614655] ? find_held_lock+0x36/0x1c0 [ 48.618703] ? lock_downgrade+0x8e0/0x8e0 [ 48.622836] ? kasan_check_read+0x11/0x20 [ 48.626977] ? do_raw_spin_unlock+0x9e/0x2e0 [ 48.631371] ? __local_bh_enable_ip+0x161/0x230 [ 48.636025] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 48.641033] ? release_sock+0x1e2/0x2b0 [ 48.644994] ? trace_hardirqs_on+0xd/0x10 [ 48.649127] ? __local_bh_enable_ip+0x161/0x230 [ 48.653779] ? _raw_spin_unlock_bh+0x30/0x40 [ 48.658173] ? release_sock+0x1e2/0x2b0 [ 48.662133] ? __release_sock+0x3a0/0x3a0 [ 48.666267] ? __local_bh_enable_ip+0x161/0x230 [ 48.670927] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 48.676107] ? smc_setsockopt+0x1ed/0x630 [ 48.680245] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.685773] ? __sys_setsockopt+0x24f/0x390 [ 48.690088] do_group_exit+0x16f/0x430 [ 48.693961] ? mm_fault_error+0x380/0x380 [ 48.698096] ? __ia32_sys_exit+0x50/0x50 [ 48.702141] ? do_syscall_64+0x92/0x800 [ 48.706100] __x64_sys_exit_group+0x3e/0x50 [ 48.710410] do_syscall_64+0x1b1/0x800 [ 48.714285] ? syscall_return_slowpath+0x5c0/0x5c0 [ 48.719200] ? syscall_return_slowpath+0x30f/0x5c0 [ 48.724127] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 48.729479] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 48.734310] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 48.739481] RIP: 0033:0x43e8d8 [ 48.742652] RSP: 002b:00007ffc6d85d568 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 48.750348] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 48.757603] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 48.764861] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 48.772128] R10: 0000000020000040 R11: 0000000000000246 R12: 0000000000000001 [ 48.779384] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 48.787247] Dumping ftrace buffer: [ 48.790902] (ftrace buffer empty) [ 48.794595] Kernel Offset: disabled [ 48.798210] Rebooting in 86400 seconds..