[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.959433] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.761359] random: sshd: uninitialized urandom read (32 bytes read) [ 23.056591] random: sshd: uninitialized urandom read (32 bytes read) [ 23.810405] random: sshd: uninitialized urandom read (32 bytes read) [ 23.965698] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.21' (ECDSA) to the list of known hosts. [ 29.370905] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.461224] WARNING: CPU: 0 PID: 4501 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 29.469605] Kernel panic - not syncing: panic_on_warn set ... [ 29.469605] [ 29.476952] CPU: 0 PID: 4501 Comm: syz-executor918 Not tainted 4.17.0-rc6+ #61 [ 29.484288] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.493622] Call Trace: [ 29.496196] dump_stack+0x1b9/0x294 [ 29.499805] ? dump_stack_print_info.cold.2+0x52/0x52 [ 29.504992] ? smc_unhash_sk+0x310/0x4a0 [ 29.509044] panic+0x22f/0x4de [ 29.512226] ? add_taint.cold.5+0x16/0x16 [ 29.516354] ? __warn.cold.8+0x148/0x1b3 [ 29.520392] ? __warn.cold.8+0x117/0x1b3 [ 29.524432] ? smc_unhash_sk+0x345/0x4a0 [ 29.528471] __warn.cold.8+0x163/0x1b3 [ 29.532336] ? smc_unhash_sk+0x345/0x4a0 [ 29.536377] report_bug+0x252/0x2d0 [ 29.539986] do_error_trap+0x1de/0x490 [ 29.543855] ? graph_lock+0x170/0x170 [ 29.547635] ? math_error+0x420/0x420 [ 29.551418] ? lock_acquire+0x1dc/0x520 [ 29.555374] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.560195] do_invalid_op+0x1b/0x20 [ 29.563886] invalid_op+0x14/0x20 [ 29.567330] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 29.571981] RSP: 0018:ffff8801ad2df488 EFLAGS: 00010293 [ 29.577322] RAX: ffff8801acc4e180 RBX: ffff8801ad2e47c0 RCX: ffffffff8742137e [ 29.584570] RDX: 0000000000000000 RSI: ffffffff87421435 RDI: 0000000000000005 [ 29.591816] RBP: ffff8801ad2df570 R08: ffff8801acc4e180 R09: ffffed0035a5c908 [ 29.599074] R10: ffffed0035a5c908 R11: ffff8801ad2e4843 R12: 1ffff10035a5be95 [ 29.606321] R13: ffff8801ad2df548 R14: ffffffff8970e2a0 R15: ffff8801ad2e4840 [ 29.613578] ? smc_unhash_sk+0x28e/0x4a0 [ 29.617629] ? smc_unhash_sk+0x345/0x4a0 [ 29.621678] ? smc_unhash_sk+0x345/0x4a0 [ 29.625722] ? smc_rx_data_available+0x100/0x100 [ 29.630478] ? release_sock+0x1e2/0x2b0 [ 29.634442] ? __local_bh_enable_ip+0x161/0x230 [ 29.639098] ? __release_sock+0x3a0/0x3a0 [ 29.643229] ? smc_release+0x269/0x610 [ 29.647094] ? trace_hardirqs_on+0xd/0x10 [ 29.651221] ? __local_bh_enable_ip+0x161/0x230 [ 29.655871] smc_release+0x36e/0x610 [ 29.659575] sock_release+0x96/0x1b0 [ 29.663267] ? sock_alloc_file+0x4e0/0x4e0 [ 29.667486] sock_close+0x16/0x20 [ 29.670924] __fput+0x34d/0x890 [ 29.674186] ? fput+0x1a0/0x1a0 [ 29.677459] ? _raw_spin_unlock_irq+0x27/0x70 [ 29.681941] ____fput+0x15/0x20 [ 29.685200] task_work_run+0x1e4/0x290 [ 29.689080] ? task_work_cancel+0x240/0x240 [ 29.693388] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 29.698918] ? switch_task_namespaces+0xa2/0xd0 [ 29.703571] do_exit+0x1aee/0x2730 [ 29.707100] ? mm_update_next_owner+0x980/0x980 [ 29.711753] ? kasan_check_read+0x11/0x20 [ 29.715879] ? do_raw_spin_unlock+0x9e/0x2e0 [ 29.720269] ? __local_bh_enable_ip+0x161/0x230 [ 29.724920] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.729934] ? release_sock+0x1e2/0x2b0 [ 29.733886] ? trace_hardirqs_on+0xd/0x10 [ 29.738024] ? __local_bh_enable_ip+0x161/0x230 [ 29.742678] ? _raw_spin_unlock_bh+0x30/0x40 [ 29.747068] ? kasan_check_read+0x11/0x20 [ 29.751193] ? rcu_is_watching+0x85/0x140 [ 29.755320] ? rcu_pm_notify+0xc0/0xc0 [ 29.759189] ? ___sys_sendmsg+0x31a/0x940 [ 29.763324] ? kfree+0x1e9/0x260 [ 29.766669] ? ___sys_sendmsg+0x31f/0x940 [ 29.770801] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.776319] ? __handle_mm_fault+0x93a/0x4310 [ 29.780799] ? copy_msghdr_from_user+0x560/0x560 [ 29.785534] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 29.790267] ? graph_lock+0x170/0x170 [ 29.794061] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.799593] ? __fget_light+0x2ef/0x430 [ 29.803550] ? fget_raw+0x20/0x20 [ 29.806984] ? find_held_lock+0x36/0x1c0 [ 29.811046] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 29.816570] ? sockfd_lookup_light+0xc5/0x160 [ 29.821048] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.826562] ? __sys_sendmsg+0x1aa/0x270 [ 29.830602] ? __ia32_sys_shutdown+0x80/0x80 [ 29.834989] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.840529] ? __do_page_fault+0x441/0xe40 [ 29.844770] do_group_exit+0x16f/0x430 [ 29.848638] ? __ia32_sys_exit+0x50/0x50 [ 29.852683] ? do_syscall_64+0x92/0x800 [ 29.856637] __x64_sys_exit_group+0x3e/0x50 [ 29.860945] do_syscall_64+0x1b1/0x800 [ 29.864812] ? syscall_return_slowpath+0x5c0/0x5c0 [ 29.869720] ? syscall_return_slowpath+0x30f/0x5c0 [ 29.874634] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 29.879984] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.884811] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 29.889986] RIP: 0033:0x43e998 [ 29.893156] RSP: 002b:00007ffec387bed8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 29.900844] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e998 [ 29.908089] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 29.915341] RBP: 00000000004be340 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 29.922593] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 29.929845] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 29.937738] Dumping ftrace buffer: [ 29.941366] (ftrace buffer empty) [ 29.945054] Kernel Offset: disabled [ 29.948663] Rebooting in 86400 seconds..