[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.314487] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.693437] random: sshd: uninitialized urandom read (32 bytes read) [ 24.093976] random: sshd: uninitialized urandom read (32 bytes read) [ 24.902620] random: sshd: uninitialized urandom read (32 bytes read) [ 25.079700] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.38' (ECDSA) to the list of known hosts. [ 30.605851] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 30.713047] WARNING: CPU: 0 PID: 4596 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 30.721537] Kernel panic - not syncing: panic_on_warn set ... [ 30.721537] [ 30.728902] CPU: 0 PID: 4596 Comm: syz-executor070 Not tainted 4.17.0-rc3+ #40 [ 30.736487] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.746199] Call Trace: [ 30.748795] dump_stack+0x1b9/0x294 [ 30.752438] ? dump_stack_print_info.cold.2+0x52/0x52 [ 30.757655] ? smc_unhash_sk+0x280/0x4a0 [ 30.761715] panic+0x22f/0x4de [ 30.764903] ? add_taint.cold.5+0x16/0x16 [ 30.769064] ? __warn.cold.8+0x148/0x1b3 [ 30.773176] ? __warn.cold.8+0x117/0x1b3 [ 30.777245] ? smc_unhash_sk+0x345/0x4a0 [ 30.781302] __warn.cold.8+0x163/0x1b3 [ 30.785185] ? smc_unhash_sk+0x345/0x4a0 [ 30.789262] report_bug+0x252/0x2d0 [ 30.792905] do_error_trap+0x1de/0x490 [ 30.796794] ? graph_lock+0x170/0x170 [ 30.800589] ? math_error+0x420/0x420 [ 30.806124] ? lock_acquire+0x1dc/0x520 [ 30.811563] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.816721] do_invalid_op+0x1b/0x20 [ 30.820444] invalid_op+0x14/0x20 [ 30.823892] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 30.828546] RSP: 0018:ffff8801d934f488 EFLAGS: 00010293 [ 30.833900] RAX: ffff8801b04526c0 RBX: ffff8801d97b17c0 RCX: ffffffff87402a0e [ 30.841170] RDX: 0000000000000000 RSI: ffffffff87402ac5 RDI: 0000000000000005 [ 30.848603] RBP: ffff8801d934f570 R08: ffff8801b04526c0 R09: ffffed003b2f6308 [ 30.855879] R10: ffffed003b2f6308 R11: ffff8801d97b1843 R12: 1ffff1003b269e95 [ 30.863148] R13: ffff8801d934f548 R14: ffffffff8970caa0 R15: ffff8801d97b1840 [ 30.870452] ? smc_unhash_sk+0x28e/0x4a0 [ 30.874511] ? smc_unhash_sk+0x345/0x4a0 [ 30.880955] ? smc_unhash_sk+0x345/0x4a0 [ 30.885139] ? smc_rx_data_available+0x100/0x100 [ 30.889971] ? release_sock+0x1e2/0x2b0 [ 30.894147] ? __local_bh_enable_ip+0x161/0x230 [ 30.899193] ? __release_sock+0x3a0/0x3a0 [ 30.903456] ? smc_release+0x269/0x610 [ 30.907364] ? trace_hardirqs_on+0xd/0x10 [ 30.911516] ? __local_bh_enable_ip+0x161/0x230 [ 30.916192] smc_release+0x36e/0x610 [ 30.919916] sock_release+0x96/0x1b0 [ 30.923637] ? sock_alloc_file+0x4e0/0x4e0 [ 30.927887] sock_close+0x16/0x20 [ 30.931350] __fput+0x34d/0x890 [ 30.934637] ? fput+0x1a0/0x1a0 [ 30.937928] ? _raw_spin_unlock_irq+0x27/0x70 [ 30.942431] ____fput+0x15/0x20 [ 30.945710] task_work_run+0x1e4/0x290 [ 30.949603] ? task_work_cancel+0x240/0x240 [ 30.953938] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 30.959475] ? switch_task_namespaces+0xa2/0xd0 [ 30.964146] do_exit+0x1aee/0x2730 [ 30.967700] ? mm_update_next_owner+0x980/0x980 [ 30.972373] ? find_held_lock+0x36/0x1c0 [ 30.976443] ? lock_downgrade+0x8e0/0x8e0 [ 30.980601] ? lock_downgrade+0x8e0/0x8e0 [ 30.984756] ? kasan_check_read+0x11/0x20 [ 30.988908] ? do_raw_spin_unlock+0x9e/0x2e0 [ 30.993417] ? __local_bh_enable_ip+0x161/0x230 [ 30.998084] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.003110] ? release_sock+0x1e2/0x2b0 [ 31.007087] ? trace_hardirqs_on+0xd/0x10 [ 31.011240] ? __local_bh_enable_ip+0x161/0x230 [ 31.015918] ? _raw_spin_unlock_bh+0x30/0x40 [ 31.020343] ? release_sock+0x1e2/0x2b0 [ 31.024316] ? __release_sock+0x3a0/0x3a0 [ 31.028464] ? __local_bh_enable_ip+0x161/0x230 [ 31.033136] ? lock_sock_nested+0xe7/0x120 [ 31.037366] ? smc_sendmsg+0x2d5/0x370 [ 31.041242] ? smc_sendpage+0x1a0/0x1a0 [ 31.045222] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.050761] ? sock_sendmsg+0x5a/0x120 [ 31.054795] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.060340] ? __sys_sendto+0x475/0x670 [ 31.064338] ? __ia32_sys_getpeername+0xb0/0xb0 [ 31.069009] ? lock_downgrade+0x8e0/0x8e0 [ 31.073163] ? handle_mm_fault+0x8c0/0xc70 [ 31.077440] ? handle_mm_fault+0x55a/0xc70 [ 31.082121] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.087719] do_group_exit+0x16f/0x430 [ 31.091616] ? __ia32_sys_exit+0x50/0x50 [ 31.095705] ? do_syscall_64+0x92/0x800 [ 31.099702] __x64_sys_exit_group+0x3e/0x50 [ 31.104032] do_syscall_64+0x1b1/0x800 [ 31.107921] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 31.112770] ? syscall_return_slowpath+0x5c0/0x5c0 [ 31.117697] ? syscall_return_slowpath+0x30f/0x5c0 [ 31.122625] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 31.128110] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.132968] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.138171] RIP: 0033:0x43e8e8 [ 31.141425] RSP: 002b:00007fff942f7a68 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 31.149157] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8e8 [ 31.156427] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 31.163897] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 31.171185] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 31.178469] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 31.186619] Dumping ftrace buffer: [ 31.190378] (ftrace buffer empty) [ 31.194081] Kernel Offset: disabled [ 31.197719] Rebooting in 86400 seconds..