[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.871367] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.130823] random: sshd: uninitialized urandom read (32 bytes read) [ 21.513781] random: sshd: uninitialized urandom read (32 bytes read) [ 22.233672] random: sshd: uninitialized urandom read (32 bytes read) [ 22.491873] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.52' (ECDSA) to the list of known hosts. [ 27.959234] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 28.050049] WARNING: CPU: 0 PID: 4502 at include/net/sock.h:639 smc_unhash_sk+0x345/0x4a0 [ 28.058452] Kernel panic - not syncing: panic_on_warn set ... [ 28.058452] [ 28.065804] CPU: 0 PID: 4502 Comm: syz-executor188 Not tainted 4.17.0-rc2+ #26 [ 28.073142] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.082480] Call Trace: [ 28.085055] dump_stack+0x1b9/0x294 [ 28.088671] ? dump_stack_print_info.cold.2+0x52/0x52 [ 28.093845] ? smc_unhash_sk+0x290/0x4a0 [ 28.097884] panic+0x22f/0x4de [ 28.101316] ? add_taint.cold.5+0x16/0x16 [ 28.105447] ? __warn.cold.8+0x148/0x1b3 [ 28.109487] ? __warn.cold.8+0x117/0x1b3 [ 28.113526] ? smc_unhash_sk+0x345/0x4a0 [ 28.117567] __warn.cold.8+0x163/0x1b3 [ 28.121431] ? smc_unhash_sk+0x345/0x4a0 [ 28.125471] report_bug+0x252/0x2d0 [ 28.129095] do_error_trap+0x1de/0x490 [ 28.132984] ? graph_lock+0x170/0x170 [ 28.136789] ? math_error+0x420/0x420 [ 28.140592] ? lock_acquire+0x1dc/0x520 [ 28.144552] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.149374] do_invalid_op+0x1b/0x20 [ 28.153076] invalid_op+0x14/0x20 [ 28.156509] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 28.161161] RSP: 0018:ffff8801cf27f488 EFLAGS: 00010293 [ 28.166504] RAX: ffff8801af24a1c0 RBX: ffff8801adee87c0 RCX: ffffffff873faafe [ 28.173753] RDX: 0000000000000000 RSI: ffffffff873fabb5 RDI: 0000000000000005 [ 28.181010] RBP: ffff8801cf27f570 R08: ffff8801af24a1c0 R09: ffffed0035bdd108 [ 28.188268] R10: ffffed0035bdd108 R11: ffff8801adee8843 R12: 1ffff10039e4fe95 [ 28.195520] R13: ffff8801cf27f548 R14: ffffffff8970df20 R15: ffff8801adee8840 [ 28.202790] ? smc_unhash_sk+0x28e/0x4a0 [ 28.206833] ? smc_unhash_sk+0x345/0x4a0 [ 28.210877] ? smc_unhash_sk+0x345/0x4a0 [ 28.215027] ? smc_hash_sk+0x2f0/0x2f0 [ 28.218902] ? release_sock+0x1e2/0x2b0 [ 28.222861] ? __local_bh_enable_ip+0x161/0x230 [ 28.227509] ? __release_sock+0x3a0/0x3a0 [ 28.231648] ? smc_release+0x269/0x610 [ 28.235540] ? trace_hardirqs_on+0xd/0x10 [ 28.239671] ? __local_bh_enable_ip+0x161/0x230 [ 28.244325] smc_release+0x36e/0x610 [ 28.248035] sock_release+0x96/0x1b0 [ 28.251733] ? sock_alloc_file+0x4e0/0x4e0 [ 28.255952] sock_close+0x16/0x20 [ 28.259388] __fput+0x34d/0x890 [ 28.262658] ? fput+0x1a0/0x1a0 [ 28.265921] ? _raw_spin_unlock_irq+0x27/0x70 [ 28.270398] ____fput+0x15/0x20 [ 28.273656] task_work_run+0x1e4/0x290 [ 28.277525] ? task_work_cancel+0x240/0x240 [ 28.281833] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 28.287364] ? switch_task_namespaces+0xa2/0xd0 [ 28.292023] do_exit+0x1aee/0x2730 [ 28.295556] ? mm_update_next_owner+0x980/0x980 [ 28.300207] ? find_held_lock+0x36/0x1c0 [ 28.304252] ? lock_downgrade+0x8e0/0x8e0 [ 28.308378] ? lock_downgrade+0x8e0/0x8e0 [ 28.312517] ? kasan_check_read+0x11/0x20 [ 28.316645] ? do_raw_spin_unlock+0x9e/0x2e0 [ 28.321040] ? __local_bh_enable_ip+0x161/0x230 [ 28.325689] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 28.330682] ? release_sock+0x1e2/0x2b0 [ 28.334633] ? trace_hardirqs_on+0xd/0x10 [ 28.338781] ? __local_bh_enable_ip+0x161/0x230 [ 28.343445] ? _raw_spin_unlock_bh+0x30/0x40 [ 28.347836] ? release_sock+0x1e2/0x2b0 [ 28.351791] ? __release_sock+0x3a0/0x3a0 [ 28.355922] ? __local_bh_enable_ip+0x161/0x230 [ 28.360569] ? lock_sock_nested+0xe7/0x120 [ 28.364786] ? smc_sendmsg+0x2d5/0x370 [ 28.368660] ? smc_recvmsg+0x300/0x300 [ 28.372528] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.378056] ? sock_sendmsg+0x5a/0x120 [ 28.381926] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.387440] ? __sys_sendto+0x475/0x670 [ 28.391393] ? __ia32_sys_getpeername+0xb0/0xb0 [ 28.396051] ? lock_downgrade+0x8e0/0x8e0 [ 28.400180] ? handle_mm_fault+0x8c0/0xc70 [ 28.404396] ? handle_mm_fault+0x55a/0xc70 [ 28.408618] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.414137] ? __do_page_fault+0x441/0xe40 [ 28.418353] do_group_exit+0x16f/0x430 [ 28.422219] ? mm_fault_error+0x380/0x380 [ 28.426352] ? __ia32_sys_exit+0x50/0x50 [ 28.430397] ? do_syscall_64+0x92/0x800 [ 28.434372] __x64_sys_exit_group+0x3e/0x50 [ 28.438674] do_syscall_64+0x1b1/0x800 [ 28.443217] ? syscall_return_slowpath+0x5c0/0x5c0 [ 28.448159] ? syscall_return_slowpath+0x30f/0x5c0 [ 28.453099] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 28.458459] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.463288] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 28.468458] RIP: 0033:0x43e928 [ 28.471639] RSP: 002b:00007ffeda96eab8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 28.479329] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e928 [ 28.486587] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 28.493836] RBP: 00000000004be2c0 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 28.501101] R10: fffffffffffffffc R11: 0000000000000246 R12: 0000000000000001 [ 28.508350] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 28.516236] Dumping ftrace buffer: [ 28.519875] (ftrace buffer empty) [ 28.523565] Kernel Offset: disabled [ 28.527172] Rebooting in 86400 seconds..