[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.531999] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.310716] random: sshd: uninitialized urandom read (32 bytes read) [ 24.616338] random: sshd: uninitialized urandom read (32 bytes read) [ 25.437138] random: sshd: uninitialized urandom read (32 bytes read) [ 25.601230] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.44' (ECDSA) to the list of known hosts. [ 31.106617] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.203292] WARNING: CPU: 1 PID: 4540 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 31.211694] Kernel panic - not syncing: panic_on_warn set ... [ 31.211694] [ 31.219060] CPU: 1 PID: 4540 Comm: syz-executor480 Not tainted 4.17.0-rc6+ #61 [ 31.226414] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.235762] Call Trace: [ 31.238342] dump_stack+0x1b9/0x294 [ 31.241975] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.247169] ? smc_unhash_sk+0x310/0x4a0 [ 31.251242] panic+0x22f/0x4de [ 31.254446] ? add_taint.cold.5+0x16/0x16 [ 31.258594] ? __warn.cold.8+0x148/0x1b3 [ 31.262650] ? __warn.cold.8+0x117/0x1b3 [ 31.266708] ? smc_unhash_sk+0x345/0x4a0 [ 31.270763] __warn.cold.8+0x163/0x1b3 [ 31.274653] ? smc_unhash_sk+0x345/0x4a0 [ 31.278704] report_bug+0x252/0x2d0 [ 31.282324] do_error_trap+0x1de/0x490 [ 31.286205] ? graph_lock+0x170/0x170 [ 31.290000] ? math_error+0x420/0x420 [ 31.293809] ? lock_acquire+0x1dc/0x520 [ 31.297786] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.302629] do_invalid_op+0x1b/0x20 [ 31.306335] invalid_op+0x14/0x20 [ 31.309774] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 31.314423] RSP: 0018:ffff8801d95cf488 EFLAGS: 00010293 [ 31.319771] RAX: ffff8801ad8d6440 RBX: ffff8801ad94e7c0 RCX: ffffffff8742137e [ 31.327045] RDX: 0000000000000000 RSI: ffffffff87421435 RDI: 0000000000000005 [ 31.334317] RBP: ffff8801d95cf570 R08: ffff8801ad8d6440 R09: ffffed0035b29d08 [ 31.341923] R10: ffffed0035b29d08 R11: ffff8801ad94e843 R12: 1ffff1003b2b9e95 [ 31.349184] R13: ffff8801d95cf548 R14: ffffffff8970e2a0 R15: ffff8801ad94e840 [ 31.356484] ? smc_unhash_sk+0x28e/0x4a0 [ 31.360550] ? smc_unhash_sk+0x345/0x4a0 [ 31.364602] ? smc_unhash_sk+0x345/0x4a0 [ 31.368664] ? smc_rx_data_available+0x100/0x100 [ 31.373518] ? release_sock+0x1e2/0x2b0 [ 31.377493] ? __local_bh_enable_ip+0x161/0x230 [ 31.382155] ? __release_sock+0x3a0/0x3a0 [ 31.386293] ? smc_release+0x269/0x610 [ 31.390174] ? trace_hardirqs_on+0xd/0x10 [ 31.394317] ? __local_bh_enable_ip+0x161/0x230 [ 31.398986] smc_release+0x36e/0x610 [ 31.402693] sock_release+0x96/0x1b0 [ 31.406407] ? sock_alloc_file+0x4e0/0x4e0 [ 31.410630] sock_close+0x16/0x20 [ 31.414070] __fput+0x34d/0x890 [ 31.417338] ? fput+0x1a0/0x1a0 [ 31.420611] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.425098] ____fput+0x15/0x20 [ 31.428379] task_work_run+0x1e4/0x290 [ 31.432267] ? task_work_cancel+0x240/0x240 [ 31.436587] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 31.442111] ? switch_task_namespaces+0xa2/0xd0 [ 31.446777] do_exit+0x1aee/0x2730 [ 31.450314] ? mm_update_next_owner+0x980/0x980 [ 31.454978] ? kasan_check_read+0x11/0x20 [ 31.459114] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.463511] ? __local_bh_enable_ip+0x161/0x230 [ 31.468165] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.473183] ? release_sock+0x1e2/0x2b0 [ 31.477156] ? trace_hardirqs_on+0xd/0x10 [ 31.481288] ? __local_bh_enable_ip+0x161/0x230 [ 31.485943] ? _raw_spin_unlock_bh+0x30/0x40 [ 31.490361] ? kasan_check_read+0x11/0x20 [ 31.494497] ? rcu_is_watching+0x85/0x140 [ 31.498651] ? rcu_pm_notify+0xc0/0xc0 [ 31.502535] ? ___sys_sendmsg+0x31a/0x940 [ 31.506689] ? kfree+0x1e9/0x260 [ 31.510052] ? ___sys_sendmsg+0x31f/0x940 [ 31.514203] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.520527] ? copy_msghdr_from_user+0x560/0x560 [ 31.525290] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 31.530046] ? graph_lock+0x170/0x170 [ 31.533845] ? find_held_lock+0x36/0x1c0 [ 31.537901] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.543430] ? __fget_light+0x2ef/0x430 [ 31.547426] ? find_held_lock+0x36/0x1c0 [ 31.551486] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.557020] ? sockfd_lookup_light+0xc5/0x160 [ 31.561520] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.567060] ? __sys_sendmsg+0x1aa/0x270 [ 31.571117] ? __ia32_sys_shutdown+0x80/0x80 [ 31.575534] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.581079] ? __do_page_fault+0x441/0xe40 [ 31.585307] do_group_exit+0x16f/0x430 [ 31.589370] ? __ia32_sys_exit+0x50/0x50 [ 31.593432] ? do_syscall_64+0x92/0x800 [ 31.597409] __x64_sys_exit_group+0x3e/0x50 [ 31.601739] do_syscall_64+0x1b1/0x800 [ 31.605634] ? syscall_return_slowpath+0x5c0/0x5c0 [ 31.610559] ? syscall_return_slowpath+0x30f/0x5c0 [ 31.615489] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 31.620857] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.625706] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.630885] RIP: 0033:0x43e9a8 [ 31.634061] RSP: 002b:00007ffcfd293668 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 31.641758] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e9a8 [ 31.649018] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 31.656283] RBP: 00000000004be340 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 31.663543] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 31.670806] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 31.678683] Dumping ftrace buffer: [ 31.682379] (ftrace buffer empty) [ 31.686077] Kernel Offset: disabled [ 31.689700] Rebooting in 86400 seconds..