[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.540770] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.042625] random: sshd: uninitialized urandom read (32 bytes read) [ 26.376012] random: sshd: uninitialized urandom read (32 bytes read) [ 27.097232] random: sshd: uninitialized urandom read (32 bytes read) [ 41.421398] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.0' (ECDSA) to the list of known hosts. [ 46.917704] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 47.008745] WARNING: CPU: 1 PID: 4527 at include/net/sock.h:639 smc_unhash_sk+0x345/0x4a0 [ 47.017144] Kernel panic - not syncing: panic_on_warn set ... [ 47.017144] [ 47.024493] CPU: 1 PID: 4527 Comm: syz-executor319 Not tainted 4.17.0-rc2+ #23 [ 47.031842] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.041174] Call Trace: [ 47.043747] dump_stack+0x1b9/0x294 [ 47.047360] ? dump_stack_print_info.cold.2+0x52/0x52 [ 47.052545] ? smc_unhash_sk+0x2d0/0x4a0 [ 47.056589] panic+0x22f/0x4de [ 47.059762] ? add_taint.cold.5+0x16/0x16 [ 47.063892] ? __warn.cold.8+0x148/0x1b3 [ 47.067931] ? __warn.cold.8+0x117/0x1b3 [ 47.071974] ? smc_unhash_sk+0x345/0x4a0 [ 47.076017] __warn.cold.8+0x163/0x1b3 [ 47.079888] ? smc_unhash_sk+0x345/0x4a0 [ 47.084017] report_bug+0x252/0x2d0 [ 47.087627] do_error_trap+0x1de/0x490 [ 47.091499] ? graph_lock+0x170/0x170 [ 47.095279] ? math_error+0x420/0x420 [ 47.099064] ? lock_acquire+0x1dc/0x520 [ 47.103022] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 47.107879] do_invalid_op+0x1b/0x20 [ 47.111576] invalid_op+0x14/0x20 [ 47.115012] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 47.119677] RSP: 0018:ffff8801adadf488 EFLAGS: 00010293 [ 47.125021] RAX: ffff8801b260e1c0 RBX: ffff8801ada557c0 RCX: ffffffff873f89be [ 47.132272] RDX: 0000000000000000 RSI: ffffffff873f8a75 RDI: 0000000000000005 [ 47.139522] RBP: ffff8801adadf570 R08: ffff8801b260e1c0 R09: ffffed0035b4ab08 [ 47.146776] R10: ffffed0035b4ab08 R11: ffff8801ada55843 R12: 1ffff10035b5be95 [ 47.154029] R13: ffff8801adadf548 R14: ffffffff8970dea0 R15: ffff8801ada55840 [ 47.161288] ? smc_unhash_sk+0x28e/0x4a0 [ 47.165327] ? smc_unhash_sk+0x345/0x4a0 [ 47.169370] ? smc_unhash_sk+0x345/0x4a0 [ 47.173416] ? smc_hash_sk+0x2f0/0x2f0 [ 47.177546] ? release_sock+0x1e2/0x2b0 [ 47.181505] ? __local_bh_enable_ip+0x161/0x230 [ 47.186154] ? __release_sock+0x3a0/0x3a0 [ 47.190296] ? smc_release+0x269/0x610 [ 47.194162] ? trace_hardirqs_on+0xd/0x10 [ 47.198293] ? __local_bh_enable_ip+0x161/0x230 [ 47.202944] smc_release+0x36e/0x610 [ 47.206652] sock_release+0x96/0x1b0 [ 47.210347] ? sock_alloc_file+0x4e0/0x4e0 [ 47.214573] sock_close+0x16/0x20 [ 47.218010] __fput+0x34d/0x890 [ 47.221286] ? fput+0x1a0/0x1a0 [ 47.224549] ? _raw_spin_unlock_irq+0x27/0x70 [ 47.229027] ____fput+0x15/0x20 [ 47.232288] task_work_run+0x1e4/0x290 [ 47.236162] ? task_work_cancel+0x240/0x240 [ 47.240468] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 47.245994] ? switch_task_namespaces+0xa2/0xd0 [ 47.250659] do_exit+0x1aee/0x2730 [ 47.254183] ? mm_update_next_owner+0x980/0x980 [ 47.258837] ? find_held_lock+0x36/0x1c0 [ 47.262892] ? lock_downgrade+0x8e0/0x8e0 [ 47.267021] ? lock_downgrade+0x8e0/0x8e0 [ 47.271164] ? kasan_check_read+0x11/0x20 [ 47.275293] ? do_raw_spin_unlock+0x9e/0x2e0 [ 47.279680] ? __local_bh_enable_ip+0x161/0x230 [ 47.284331] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 47.289423] ? release_sock+0x1e2/0x2b0 [ 47.293526] ? trace_hardirqs_on+0xd/0x10 [ 47.297658] ? __local_bh_enable_ip+0x161/0x230 [ 47.302323] ? _raw_spin_unlock_bh+0x30/0x40 [ 47.306720] ? release_sock+0x1e2/0x2b0 [ 47.310674] ? __release_sock+0x3a0/0x3a0 [ 47.314814] ? __local_bh_enable_ip+0x161/0x230 [ 47.319464] ? lock_sock_nested+0xe7/0x120 [ 47.323683] ? smc_sendmsg+0x2d5/0x370 [ 47.327549] ? smc_recvmsg+0x300/0x300 [ 47.331418] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 47.337109] ? sock_sendmsg+0x5a/0x120 [ 47.341087] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 47.346603] ? __sys_sendto+0x475/0x670 [ 47.350557] ? __ia32_sys_getpeername+0xb0/0xb0 [ 47.355210] ? lock_downgrade+0x8e0/0x8e0 [ 47.359338] ? handle_mm_fault+0x8c0/0xc70 [ 47.363991] ? handle_mm_fault+0x55a/0xc70 [ 47.368216] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 47.374529] do_group_exit+0x16f/0x430 [ 47.378409] ? __ia32_sys_exit+0x50/0x50 [ 47.382453] ? do_syscall_64+0x92/0x800 [ 47.386420] __x64_sys_exit_group+0x3e/0x50 [ 47.390741] do_syscall_64+0x1b1/0x800 [ 47.394621] ? syscall_return_slowpath+0x5c0/0x5c0 [ 47.399533] ? syscall_return_slowpath+0x30f/0x5c0 [ 47.404891] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 47.410238] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 47.415066] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 47.420237] RIP: 0033:0x43e8e8 [ 47.423408] RSP: 002b:00007ffd9383e608 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 47.435623] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8e8 [ 47.442884] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 47.450136] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 47.457398] R10: 0000000020040000 R11: 0000000000000246 R12: 0000000000000001 [ 47.464650] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 47.472570] Dumping ftrace buffer: [ 47.476189] (ftrace buffer empty) [ 47.479883] Kernel Offset: disabled [ 47.483498] Rebooting in 86400 seconds..