[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.754282] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.303654] random: sshd: uninitialized urandom read (32 bytes read) [ 24.748208] random: sshd: uninitialized urandom read (32 bytes read) [ 25.489469] random: sshd: uninitialized urandom read (32 bytes read) [ 25.647192] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.55' (ECDSA) to the list of known hosts. [ 31.127328] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.216733] WARNING: CPU: 0 PID: 4485 at include/net/sock.h:639 smc_unhash_sk+0x345/0x4a0 [ 31.225098] Kernel panic - not syncing: panic_on_warn set ... [ 31.225098] [ 31.232441] CPU: 0 PID: 4485 Comm: syz-executor238 Not tainted 4.17.0-rc2+ #25 [ 31.239780] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.249106] Call Trace: [ 31.251676] dump_stack+0x1b9/0x294 [ 31.255283] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.260454] ? smc_unhash_sk+0x320/0x4a0 [ 31.264493] panic+0x22f/0x4de [ 31.267663] ? add_taint.cold.5+0x16/0x16 [ 31.271792] ? __warn.cold.8+0x148/0x1b3 [ 31.275832] ? __warn.cold.8+0x117/0x1b3 [ 31.279873] ? smc_unhash_sk+0x345/0x4a0 [ 31.283912] __warn.cold.8+0x163/0x1b3 [ 31.287777] ? smc_unhash_sk+0x345/0x4a0 [ 31.291820] report_bug+0x252/0x2d0 [ 31.295426] do_error_trap+0x1de/0x490 [ 31.299291] ? graph_lock+0x170/0x170 [ 31.303068] ? math_error+0x420/0x420 [ 31.306849] ? lock_acquire+0x1dc/0x520 [ 31.310805] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.315629] do_invalid_op+0x1b/0x20 [ 31.319319] invalid_op+0x14/0x20 [ 31.322748] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 31.327391] RSP: 0018:ffff8801ade57488 EFLAGS: 00010293 [ 31.332733] RAX: ffff8801adfc8600 RBX: ffff8801ade957c0 RCX: ffffffff873f926e [ 31.339987] RDX: 0000000000000000 RSI: ffffffff873f9325 RDI: 0000000000000005 [ 31.347238] RBP: ffff8801ade57570 R08: ffff8801adfc8600 R09: ffffed0035bd2b08 [ 31.354485] R10: ffffed0035bd2b08 R11: ffff8801ade95843 R12: 1ffff10035bcae95 [ 31.361732] R13: ffff8801ade57548 R14: ffffffff8970dea0 R15: ffff8801ade95840 [ 31.368987] ? smc_unhash_sk+0x28e/0x4a0 [ 31.373032] ? smc_unhash_sk+0x345/0x4a0 [ 31.377075] ? smc_unhash_sk+0x345/0x4a0 [ 31.381112] ? smc_hash_sk+0x2f0/0x2f0 [ 31.384978] ? release_sock+0x1e2/0x2b0 [ 31.388930] ? __local_bh_enable_ip+0x161/0x230 [ 31.393578] ? __release_sock+0x3a0/0x3a0 [ 31.397707] ? smc_release+0x269/0x610 [ 31.401576] ? trace_hardirqs_on+0xd/0x10 [ 31.405704] ? __local_bh_enable_ip+0x161/0x230 [ 31.410351] smc_release+0x36e/0x610 [ 31.414050] sock_release+0x96/0x1b0 [ 31.417741] ? sock_alloc_file+0x4e0/0x4e0 [ 31.421955] sock_close+0x16/0x20 [ 31.425387] __fput+0x34d/0x890 [ 31.428651] ? fput+0x1a0/0x1a0 [ 31.431911] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.436387] ____fput+0x15/0x20 [ 31.439645] task_work_run+0x1e4/0x290 [ 31.443513] ? task_work_cancel+0x240/0x240 [ 31.447818] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 31.453333] ? switch_task_namespaces+0xa2/0xd0 [ 31.457982] do_exit+0x1aee/0x2730 [ 31.461503] ? mm_update_next_owner+0x980/0x980 [ 31.466148] ? lock_downgrade+0x8e0/0x8e0 [ 31.470272] ? noop_count+0x40/0x40 [ 31.473877] ? lock_pin_lock+0x350/0x350 [ 31.477926] ? kasan_check_read+0x11/0x20 [ 31.482057] ? rcu_is_watching+0x85/0x140 [ 31.486185] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 31.491356] ? is_bpf_text_address+0xd7/0x170 [ 31.495828] ? check_usage_backwards+0x151/0x3a0 [ 31.500560] ? graph_lock+0x170/0x170 [ 31.504338] ? graph_lock+0x170/0x170 [ 31.508124] ? find_held_lock+0x36/0x1c0 [ 31.512168] ? lock_downgrade+0x8e0/0x8e0 [ 31.516300] ? kasan_check_read+0x11/0x20 [ 31.520425] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.524813] ? __local_bh_enable_ip+0x161/0x230 [ 31.529459] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.534455] ? release_sock+0x1e2/0x2b0 [ 31.538408] ? trace_hardirqs_on+0xd/0x10 [ 31.542532] ? __local_bh_enable_ip+0x161/0x230 [ 31.547181] ? _raw_spin_unlock_bh+0x30/0x40 [ 31.551567] ? release_sock+0x1e2/0x2b0 [ 31.555518] ? __release_sock+0x3a0/0x3a0 [ 31.559643] ? __local_bh_enable_ip+0x161/0x230 [ 31.564293] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 31.569462] ? smc_setsockopt+0x1ed/0x630 [ 31.573590] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.579104] ? __sys_setsockopt+0x24f/0x390 [ 31.583406] do_group_exit+0x16f/0x430 [ 31.587272] ? mm_fault_error+0x380/0x380 [ 31.591398] ? __ia32_sys_exit+0x50/0x50 [ 31.595441] ? do_syscall_64+0x92/0x800 [ 31.599395] __x64_sys_exit_group+0x3e/0x50 [ 31.603694] do_syscall_64+0x1b1/0x800 [ 31.607561] ? syscall_return_slowpath+0x5c0/0x5c0 [ 31.612470] ? syscall_return_slowpath+0x30f/0x5c0 [ 31.617377] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 31.622720] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.627549] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.632713] RIP: 0033:0x43e8d8 [ 31.635883] RSP: 002b:00007ffdfb175318 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 31.643570] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 31.650817] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 31.658065] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 31.665313] R10: 00000000200001c0 R11: 0000000000000246 R12: 0000000000000001 [ 31.672560] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 31.680301] Dumping ftrace buffer: [ 31.683889] (ftrace buffer empty) [ 31.687573] Kernel Offset: disabled [ 31.691175] Rebooting in 86400 seconds..