[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.935799] 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: [ 24.811688] random: sshd: uninitialized urandom read (32 bytes read) [ 25.266182] random: sshd: uninitialized urandom read (32 bytes read) [ 25.999215] random: sshd: uninitialized urandom read (32 bytes read) [ 26.156949] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.5' (ECDSA) to the list of known hosts. [ 31.626181] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.717903] WARNING: CPU: 0 PID: 4444 at include/net/sock.h:639 smc_unhash_sk+0x345/0x4a0 [ 31.726306] Kernel panic - not syncing: panic_on_warn set ... [ 31.726306] [ 31.733657] CPU: 0 PID: 4444 Comm: syz-executor281 Not tainted 4.17.0-rc2+ #23 [ 31.740995] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.750330] Call Trace: [ 31.752909] dump_stack+0x1b9/0x294 [ 31.756520] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.761702] ? smc_unhash_sk+0x2d0/0x4a0 [ 31.765751] panic+0x22f/0x4de [ 31.768927] ? add_taint.cold.5+0x16/0x16 [ 31.773060] ? __warn.cold.8+0x148/0x1b3 [ 31.777101] ? __warn.cold.8+0x117/0x1b3 [ 31.781156] ? smc_unhash_sk+0x345/0x4a0 [ 31.785199] __warn.cold.8+0x163/0x1b3 [ 31.789069] ? smc_unhash_sk+0x345/0x4a0 [ 31.793113] report_bug+0x252/0x2d0 [ 31.796728] do_error_trap+0x1de/0x490 [ 31.800597] ? graph_lock+0x170/0x170 [ 31.804381] ? math_error+0x420/0x420 [ 31.808167] ? lock_acquire+0x1dc/0x520 [ 31.812127] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.816949] do_invalid_op+0x1b/0x20 [ 31.820646] invalid_op+0x14/0x20 [ 31.824079] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 31.828722] RSP: 0018:ffff8801b62d7488 EFLAGS: 00010293 [ 31.834075] RAX: ffff8801b60023c0 RBX: ffff8801b624d7c0 RCX: ffffffff873f89be [ 31.841327] RDX: 0000000000000000 RSI: ffffffff873f8a75 RDI: 0000000000000005 [ 31.848578] RBP: ffff8801b62d7570 R08: ffff8801b60023c0 R09: ffffed0036c49b08 [ 31.855828] R10: ffffed0036c49b08 R11: ffff8801b624d843 R12: 1ffff10036c5ae95 [ 31.863090] R13: ffff8801b62d7548 R14: ffffffff8970dea0 R15: ffff8801b624d840 [ 31.870367] ? smc_unhash_sk+0x28e/0x4a0 [ 31.874428] ? smc_unhash_sk+0x345/0x4a0 [ 31.878479] ? smc_unhash_sk+0x345/0x4a0 [ 31.882523] ? smc_hash_sk+0x2f0/0x2f0 [ 31.886393] ? release_sock+0x1e2/0x2b0 [ 31.890351] ? __local_bh_enable_ip+0x161/0x230 [ 31.895004] ? __release_sock+0x3a0/0x3a0 [ 31.899141] ? smc_release+0x269/0x610 [ 31.903012] ? trace_hardirqs_on+0xd/0x10 [ 31.907152] ? __local_bh_enable_ip+0x161/0x230 [ 31.911802] smc_release+0x36e/0x610 [ 31.915500] sock_release+0x96/0x1b0 [ 31.919195] ? sock_alloc_file+0x4e0/0x4e0 [ 31.923410] sock_close+0x16/0x20 [ 31.926844] __fput+0x34d/0x890 [ 31.930105] ? fput+0x1a0/0x1a0 [ 31.933368] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.937843] ____fput+0x15/0x20 [ 31.941106] task_work_run+0x1e4/0x290 [ 31.944978] ? task_work_cancel+0x240/0x240 [ 31.949284] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 31.954803] ? switch_task_namespaces+0xa2/0xd0 [ 31.959463] do_exit+0x1aee/0x2730 [ 31.962991] ? mm_update_next_owner+0x980/0x980 [ 31.967643] ? lock_downgrade+0x8e0/0x8e0 [ 31.971777] ? noop_count+0x40/0x40 [ 31.975386] ? lock_pin_lock+0x350/0x350 [ 31.979433] ? kasan_check_read+0x11/0x20 [ 31.983563] ? rcu_is_watching+0x85/0x140 [ 31.987691] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 31.992864] ? is_bpf_text_address+0xd7/0x170 [ 31.997350] ? check_usage_backwards+0x151/0x3a0 [ 32.002088] ? graph_lock+0x170/0x170 [ 32.005866] ? graph_lock+0x170/0x170 [ 32.009652] ? find_held_lock+0x36/0x1c0 [ 32.013696] ? lock_downgrade+0x8e0/0x8e0 [ 32.017829] ? kasan_check_read+0x11/0x20 [ 32.021962] ? do_raw_spin_unlock+0x9e/0x2e0 [ 32.026352] ? __local_bh_enable_ip+0x161/0x230 [ 32.031005] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 32.036012] ? release_sock+0x1e2/0x2b0 [ 32.039965] ? trace_hardirqs_on+0xd/0x10 [ 32.044094] ? __local_bh_enable_ip+0x161/0x230 [ 32.048742] ? _raw_spin_unlock_bh+0x30/0x40 [ 32.053133] ? release_sock+0x1e2/0x2b0 [ 32.057087] ? __release_sock+0x3a0/0x3a0 [ 32.061217] ? __local_bh_enable_ip+0x161/0x230 [ 32.065867] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 32.071048] ? smc_setsockopt+0x1ed/0x630 [ 32.075190] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.080709] ? __sys_setsockopt+0x24f/0x390 [ 32.085016] do_group_exit+0x16f/0x430 [ 32.088885] ? mm_fault_error+0x380/0x380 [ 32.093015] ? __ia32_sys_exit+0x50/0x50 [ 32.097071] ? do_syscall_64+0x92/0x800 [ 32.101025] __x64_sys_exit_group+0x3e/0x50 [ 32.105325] do_syscall_64+0x1b1/0x800 [ 32.109192] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 32.114014] ? syscall_return_slowpath+0x5c0/0x5c0 [ 32.118923] ? syscall_return_slowpath+0x30f/0x5c0 [ 32.123842] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 32.129186] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.134014] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 32.139183] RIP: 0033:0x43e8d8 [ 32.142350] RSP: 002b:00007fff6f529bb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 32.150037] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 32.157284] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 32.164531] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 32.171778] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 32.179036] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 32.186506] Dumping ftrace buffer: [ 32.190124] (ftrace buffer empty) [ 32.193812] Kernel Offset: disabled [ 32.197422] Rebooting in 86400 seconds..