[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.809518] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.508062] random: sshd: uninitialized urandom read (32 bytes read) [ 22.950816] random: sshd: uninitialized urandom read (32 bytes read) [ 23.706654] random: sshd: uninitialized urandom read (32 bytes read) [ 23.865088] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.35' (ECDSA) to the list of known hosts. [ 29.338188] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.445479] WARNING: CPU: 0 PID: 4532 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 29.453878] Kernel panic - not syncing: panic_on_warn set ... [ 29.453878] [ 29.461232] CPU: 0 PID: 4532 Comm: syz-executor753 Not tainted 4.17.0-rc4+ #56 [ 29.468607] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.477940] Call Trace: [ 29.480519] dump_stack+0x1b9/0x294 [ 29.484128] ? dump_stack_print_info.cold.2+0x52/0x52 [ 29.489302] ? smc_unhash_sk+0x340/0x4a0 [ 29.493344] panic+0x22f/0x4de [ 29.496519] ? add_taint.cold.5+0x16/0x16 [ 29.500650] ? __warn.cold.8+0x148/0x1b3 [ 29.504696] ? __warn.cold.8+0x117/0x1b3 [ 29.508738] ? smc_unhash_sk+0x345/0x4a0 [ 29.512783] __warn.cold.8+0x163/0x1b3 [ 29.516652] ? smc_unhash_sk+0x345/0x4a0 [ 29.520693] report_bug+0x252/0x2d0 [ 29.524301] do_error_trap+0x1de/0x490 [ 29.528168] ? graph_lock+0x170/0x170 [ 29.531947] ? math_error+0x420/0x420 [ 29.535733] ? lock_acquire+0x1dc/0x520 [ 29.539690] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.544515] do_invalid_op+0x1b/0x20 [ 29.548225] invalid_op+0x14/0x20 [ 29.551662] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 29.556307] RSP: 0018:ffff8801ae3ff488 EFLAGS: 00010293 [ 29.561651] RAX: ffff8801d9752340 RBX: ffff8801aea837c0 RCX: ffffffff8740fd4e [ 29.568902] RDX: 0000000000000000 RSI: ffffffff8740fe05 RDI: 0000000000000005 [ 29.576152] RBP: ffff8801ae3ff570 R08: ffff8801d9752340 R09: ffffed0035d50708 [ 29.583404] R10: ffffed0035d50708 R11: ffff8801aea83843 R12: 1ffff10035c7fe95 [ 29.590658] R13: ffff8801ae3ff548 R14: ffffffff8970dd60 R15: ffff8801aea83840 [ 29.597923] ? smc_unhash_sk+0x28e/0x4a0 [ 29.601972] ? smc_unhash_sk+0x345/0x4a0 [ 29.606037] ? smc_unhash_sk+0x345/0x4a0 [ 29.610079] ? smc_rx_data_available+0x100/0x100 [ 29.614815] ? release_sock+0x1e2/0x2b0 [ 29.618773] ? __local_bh_enable_ip+0x161/0x230 [ 29.623422] ? __release_sock+0x3a0/0x3a0 [ 29.627550] ? smc_release+0x269/0x610 [ 29.631417] ? trace_hardirqs_on+0xd/0x10 [ 29.636115] ? __local_bh_enable_ip+0x161/0x230 [ 29.640774] smc_release+0x36e/0x610 [ 29.644477] sock_release+0x96/0x1b0 [ 29.648182] ? sock_alloc_file+0x4e0/0x4e0 [ 29.652412] sock_close+0x16/0x20 [ 29.655847] __fput+0x34d/0x890 [ 29.659117] ? fput+0x1a0/0x1a0 [ 29.662381] ? _raw_spin_unlock_irq+0x27/0x70 [ 29.666868] ____fput+0x15/0x20 [ 29.670131] task_work_run+0x1e4/0x290 [ 29.673998] ? task_work_cancel+0x240/0x240 [ 29.678317] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 29.683837] ? switch_task_namespaces+0xa2/0xd0 [ 29.688489] do_exit+0x1aee/0x2730 [ 29.692039] ? mm_update_next_owner+0x980/0x980 [ 29.696697] ? lock_downgrade+0x8e0/0x8e0 [ 29.700829] ? noop_count+0x40/0x40 [ 29.704444] ? lock_pin_lock+0x350/0x350 [ 29.708489] ? kasan_check_read+0x11/0x20 [ 29.712617] ? rcu_is_watching+0x85/0x140 [ 29.716744] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 29.721916] ? print_usage_bug+0xc0/0xc0 [ 29.725963] ? is_bpf_text_address+0xd7/0x170 [ 29.730446] ? check_usage_backwards+0x151/0x3a0 [ 29.735185] ? graph_lock+0x170/0x170 [ 29.738966] ? graph_lock+0x170/0x170 [ 29.742752] ? find_held_lock+0x36/0x1c0 [ 29.746797] ? lock_downgrade+0x8e0/0x8e0 [ 29.750935] ? kasan_check_read+0x11/0x20 [ 29.755063] ? do_raw_spin_unlock+0x9e/0x2e0 [ 29.759452] ? __local_bh_enable_ip+0x161/0x230 [ 29.764116] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.769116] ? release_sock+0x1e2/0x2b0 [ 29.773073] ? trace_hardirqs_on+0xd/0x10 [ 29.777200] ? __local_bh_enable_ip+0x161/0x230 [ 29.781853] ? _raw_spin_unlock_bh+0x30/0x40 [ 29.786256] ? release_sock+0x1e2/0x2b0 [ 29.790210] ? __release_sock+0x3a0/0x3a0 [ 29.794342] ? __local_bh_enable_ip+0x161/0x230 [ 29.798993] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 29.804171] ? smc_setsockopt+0x1ed/0x6d0 [ 29.808301] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.813816] ? __sys_setsockopt+0x24f/0x390 [ 29.818126] do_group_exit+0x16f/0x430 [ 29.821996] ? mm_fault_error+0x380/0x380 [ 29.826129] ? __ia32_sys_exit+0x50/0x50 [ 29.830173] ? do_syscall_64+0x92/0x800 [ 29.834132] __x64_sys_exit_group+0x3e/0x50 [ 29.838434] do_syscall_64+0x1b1/0x800 [ 29.842324] ? syscall_return_slowpath+0x5c0/0x5c0 [ 29.847236] ? syscall_return_slowpath+0x30f/0x5c0 [ 29.852151] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 29.857499] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.862327] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 29.867496] RIP: 0033:0x43e8d8 [ 29.870666] RSP: 002b:00007ffeebce29c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 29.878354] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 29.885605] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 29.892860] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 29.900118] R10: 0000000020000240 R11: 0000000000000246 R12: 0000000000000001 [ 29.907369] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 29.915249] Dumping ftrace buffer: [ 29.918913] (ftrace buffer empty) [ 29.922607] Kernel Offset: disabled [ 29.926224] Rebooting in 86400 seconds..