[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.256186] 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: [ 22.677821] random: sshd: uninitialized urandom read (32 bytes read) [ 23.061000] random: sshd: uninitialized urandom read (32 bytes read) [ 23.771994] random: sshd: uninitialized urandom read (32 bytes read) [ 23.933011] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.3' (ECDSA) to the list of known hosts. [ 29.407550] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.506087] WARNING: CPU: 1 PID: 4538 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 29.514458] Kernel panic - not syncing: panic_on_warn set ... [ 29.514458] [ 29.521813] CPU: 1 PID: 4538 Comm: syz-executor034 Not tainted 4.17.0-rc3+ #33 [ 29.529150] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.538481] Call Trace: [ 29.541055] dump_stack+0x1b9/0x294 [ 29.544662] ? dump_stack_print_info.cold.2+0x52/0x52 [ 29.549832] ? smc_unhash_sk+0x270/0x4a0 [ 29.553872] panic+0x22f/0x4de [ 29.557039] ? add_taint.cold.5+0x16/0x16 [ 29.561165] ? __warn.cold.8+0x148/0x1b3 [ 29.565203] ? __warn.cold.8+0x117/0x1b3 [ 29.569243] ? smc_unhash_sk+0x345/0x4a0 [ 29.573291] __warn.cold.8+0x163/0x1b3 [ 29.577158] ? smc_unhash_sk+0x345/0x4a0 [ 29.581197] report_bug+0x252/0x2d0 [ 29.584801] do_error_trap+0x1de/0x490 [ 29.588666] ? graph_lock+0x170/0x170 [ 29.592444] ? math_error+0x420/0x420 [ 29.596225] ? lock_acquire+0x1dc/0x520 [ 29.600182] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.605001] do_invalid_op+0x1b/0x20 [ 29.608690] invalid_op+0x14/0x20 [ 29.612119] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 29.616769] RSP: 0018:ffff8801d97d7488 EFLAGS: 00010293 [ 29.622109] RAX: ffff8801ac104340 RBX: ffff8801ac1217c0 RCX: ffffffff873fe71e [ 29.629361] RDX: 0000000000000000 RSI: ffffffff873fe7d5 RDI: 0000000000000005 [ 29.636607] RBP: ffff8801d97d7570 R08: ffff8801ac104340 R09: ffffed0035824308 [ 29.643854] R10: ffffed0035824308 R11: ffff8801ac121843 R12: 1ffff1003b2fae95 [ 29.651098] R13: ffff8801d97d7548 R14: ffffffff8970e4e0 R15: ffff8801ac121840 [ 29.658350] ? smc_unhash_sk+0x28e/0x4a0 [ 29.662386] ? smc_unhash_sk+0x345/0x4a0 [ 29.666428] ? smc_unhash_sk+0x345/0x4a0 [ 29.670469] ? smc_rx_data_available+0x100/0x100 [ 29.675204] ? release_sock+0x1e2/0x2b0 [ 29.679156] ? __local_bh_enable_ip+0x161/0x230 [ 29.683804] ? __release_sock+0x3a0/0x3a0 [ 29.687928] ? smc_release+0x269/0x610 [ 29.691793] ? trace_hardirqs_on+0xd/0x10 [ 29.695917] ? __local_bh_enable_ip+0x161/0x230 [ 29.700573] smc_release+0x36e/0x610 [ 29.704267] sock_release+0x96/0x1b0 [ 29.707960] ? sock_alloc_file+0x4e0/0x4e0 [ 29.712171] sock_close+0x16/0x20 [ 29.715690] __fput+0x34d/0x890 [ 29.718949] ? fput+0x1a0/0x1a0 [ 29.722206] ? _raw_spin_unlock_irq+0x27/0x70 [ 29.726682] ____fput+0x15/0x20 [ 29.729940] task_work_run+0x1e4/0x290 [ 29.733805] ? task_work_cancel+0x240/0x240 [ 29.738106] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 29.743619] ? switch_task_namespaces+0xa2/0xd0 [ 29.748268] do_exit+0x1aee/0x2730 [ 29.751789] ? mm_update_next_owner+0x980/0x980 [ 29.756435] ? lock_downgrade+0x8e0/0x8e0 [ 29.760560] ? noop_count+0x40/0x40 [ 29.764163] ? lock_pin_lock+0x350/0x350 [ 29.768897] ? kasan_check_read+0x11/0x20 [ 29.773024] ? rcu_is_watching+0x85/0x140 [ 29.777157] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 29.782325] ? is_bpf_text_address+0xd7/0x170 [ 29.786796] ? check_usage_backwards+0x151/0x3a0 [ 29.791526] ? graph_lock+0x170/0x170 [ 29.795303] ? graph_lock+0x170/0x170 [ 29.799086] ? find_held_lock+0x36/0x1c0 [ 29.803131] ? lock_downgrade+0x8e0/0x8e0 [ 29.807260] ? kasan_check_read+0x11/0x20 [ 29.811385] ? do_raw_spin_unlock+0x9e/0x2e0 [ 29.815769] ? __local_bh_enable_ip+0x161/0x230 [ 29.820416] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.825409] ? release_sock+0x1e2/0x2b0 [ 29.829360] ? trace_hardirqs_on+0xd/0x10 [ 29.833486] ? __local_bh_enable_ip+0x161/0x230 [ 29.838132] ? _raw_spin_unlock_bh+0x30/0x40 [ 29.842520] ? release_sock+0x1e2/0x2b0 [ 29.846472] ? __release_sock+0x3a0/0x3a0 [ 29.850599] ? __local_bh_enable_ip+0x161/0x230 [ 29.855244] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 29.860413] ? smc_setsockopt+0x1ed/0x630 [ 29.864539] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.870052] ? __sys_setsockopt+0x24f/0x390 [ 29.874351] do_group_exit+0x16f/0x430 [ 29.878216] ? mm_fault_error+0x380/0x380 [ 29.882340] ? __ia32_sys_exit+0x50/0x50 [ 29.886379] ? do_syscall_64+0x92/0x800 [ 29.890333] __x64_sys_exit_group+0x3e/0x50 [ 29.894629] do_syscall_64+0x1b1/0x800 [ 29.898497] ? syscall_return_slowpath+0x5c0/0x5c0 [ 29.903405] ? syscall_return_slowpath+0x30f/0x5c0 [ 29.908311] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 29.913654] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.918479] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 29.923643] RIP: 0033:0x43e8d8 [ 29.926810] RSP: 002b:00007fffcd902e08 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 29.934494] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 29.941740] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 29.948988] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 29.956236] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 29.963482] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 29.971215] Dumping ftrace buffer: [ 29.974795] (ftrace buffer empty) [ 29.978486] Kernel Offset: disabled [ 29.982092] Rebooting in 86400 seconds..