[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.475856] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.682851] random: sshd: uninitialized urandom read (32 bytes read) [ 21.993438] random: sshd: uninitialized urandom read (32 bytes read) [ 22.750792] random: sshd: uninitialized urandom read (32 bytes read) [ 22.909981] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.40' (ECDSA) to the list of known hosts. [ 28.335536] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 28.439443] WARNING: CPU: 1 PID: 4449 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 28.447866] Kernel panic - not syncing: panic_on_warn set ... [ 28.447866] [ 28.455226] CPU: 1 PID: 4449 Comm: syz-executor155 Not tainted 4.17.0-rc4+ #52 [ 28.462583] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.471929] Call Trace: [ 28.474507] dump_stack+0x1b9/0x294 [ 28.478120] ? dump_stack_print_info.cold.2+0x52/0x52 [ 28.483315] ? smc_unhash_sk+0x2f0/0x4a0 [ 28.487358] panic+0x22f/0x4de [ 28.490534] ? add_taint.cold.5+0x16/0x16 [ 28.494670] ? __warn.cold.8+0x148/0x1b3 [ 28.498712] ? __warn.cold.8+0x117/0x1b3 [ 28.502758] ? smc_unhash_sk+0x345/0x4a0 [ 28.506804] __warn.cold.8+0x163/0x1b3 [ 28.510675] ? smc_unhash_sk+0x345/0x4a0 [ 28.514717] report_bug+0x252/0x2d0 [ 28.518327] do_error_trap+0x1de/0x490 [ 28.522209] ? graph_lock+0x170/0x170 [ 28.525992] ? math_error+0x420/0x420 [ 28.529782] ? lock_acquire+0x1dc/0x520 [ 28.533740] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.538573] do_invalid_op+0x1b/0x20 [ 28.542271] invalid_op+0x14/0x20 [ 28.545704] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 28.550352] RSP: 0018:ffff8801b953f488 EFLAGS: 00010293 [ 28.555725] RAX: ffff8801b5bae540 RBX: ffff8801b5a8a7c0 RCX: ffffffff8740fa9e [ 28.562974] RDX: 0000000000000000 RSI: ffffffff8740fb55 RDI: 0000000000000005 [ 28.570231] RBP: ffff8801b953f570 R08: ffff8801b5bae540 R09: ffffed0036b51508 [ 28.577508] R10: ffffed0036b51508 R11: ffff8801b5a8a843 R12: 1ffff100372a7e95 [ 28.584762] R13: ffff8801b953f548 R14: ffffffff8970dc60 R15: ffff8801b5a8a840 [ 28.592035] ? smc_unhash_sk+0x28e/0x4a0 [ 28.596079] ? smc_unhash_sk+0x345/0x4a0 [ 28.600124] ? smc_unhash_sk+0x345/0x4a0 [ 28.604167] ? smc_rx_data_available+0x100/0x100 [ 28.608903] ? release_sock+0x1e2/0x2b0 [ 28.612858] ? __local_bh_enable_ip+0x161/0x230 [ 28.617519] ? __release_sock+0x3a0/0x3a0 [ 28.621661] ? smc_release+0x269/0x610 [ 28.625536] ? trace_hardirqs_on+0xd/0x10 [ 28.629674] ? __local_bh_enable_ip+0x161/0x230 [ 28.634413] smc_release+0x36e/0x610 [ 28.638113] sock_release+0x96/0x1b0 [ 28.641811] ? sock_alloc_file+0x4e0/0x4e0 [ 28.646039] sock_close+0x16/0x20 [ 28.649489] __fput+0x34d/0x890 [ 28.652760] ? fput+0x1a0/0x1a0 [ 28.656039] ? _raw_spin_unlock_irq+0x27/0x70 [ 28.660536] ____fput+0x15/0x20 [ 28.663806] task_work_run+0x1e4/0x290 [ 28.667681] ? task_work_cancel+0x240/0x240 [ 28.671992] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 28.677524] ? switch_task_namespaces+0xa2/0xd0 [ 28.682179] do_exit+0x1aee/0x2730 [ 28.685722] ? mm_update_next_owner+0x980/0x980 [ 28.690385] ? kasan_check_read+0x11/0x20 [ 28.694520] ? do_raw_spin_unlock+0x9e/0x2e0 [ 28.698916] ? __local_bh_enable_ip+0x161/0x230 [ 28.703580] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 28.708598] ? release_sock+0x1e2/0x2b0 [ 28.712561] ? trace_hardirqs_on+0xd/0x10 [ 28.716693] ? __local_bh_enable_ip+0x161/0x230 [ 28.721361] ? _raw_spin_unlock_bh+0x30/0x40 [ 28.725761] ? kasan_check_read+0x11/0x20 [ 28.729898] ? rcu_is_watching+0x85/0x140 [ 28.734036] ? rcu_pm_notify+0xc0/0xc0 [ 28.737923] ? ___sys_sendmsg+0x31a/0x940 [ 28.742068] ? kfree+0x1e9/0x260 [ 28.745419] ? ___sys_sendmsg+0x31f/0x940 [ 28.749551] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.755072] ? __handle_mm_fault+0x93a/0x4310 [ 28.759550] ? copy_msghdr_from_user+0x560/0x560 [ 28.764286] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 28.769028] ? graph_lock+0x170/0x170 [ 28.772820] ? find_held_lock+0x36/0x1c0 [ 28.776867] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.782385] ? __fget_light+0x2ef/0x430 [ 28.786339] ? fget_raw+0x20/0x20 [ 28.789774] ? find_held_lock+0x36/0x1c0 [ 28.793822] ? lock_downgrade+0x8e0/0x8e0 [ 28.797950] ? handle_mm_fault+0x8c0/0xc70 [ 28.802170] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 28.807687] ? sockfd_lookup_light+0xc5/0x160 [ 28.812168] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.817688] ? __sys_sendmsg+0x1aa/0x270 [ 28.821731] ? __ia32_sys_shutdown+0x80/0x80 [ 28.826132] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.831658] ? __do_page_fault+0x441/0xe40 [ 28.835889] do_group_exit+0x16f/0x430 [ 28.839761] ? __ia32_sys_exit+0x50/0x50 [ 28.843811] ? do_syscall_64+0x92/0x800 [ 28.847776] __x64_sys_exit_group+0x3e/0x50 [ 28.852080] do_syscall_64+0x1b1/0x800 [ 28.855950] ? syscall_return_slowpath+0x5c0/0x5c0 [ 28.860869] ? syscall_return_slowpath+0x30f/0x5c0 [ 28.865794] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 28.871141] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.875968] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 28.881138] RIP: 0033:0x43ea98 [ 28.884306] RSP: 002b:00007fff56a29c68 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 28.891992] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ea98 [ 28.899248] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 28.906499] RBP: 00000000004be440 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 28.913747] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 28.921002] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 28.928907] Dumping ftrace buffer: [ 28.932562] (ftrace buffer empty) [ 28.936250] Kernel Offset: disabled [ 28.939861] Rebooting in 86400 seconds..