[....] Starting OpenBSD Secure Shell server: sshd[ 21.701660] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.076325] random: sshd: uninitialized urandom read (32 bytes read) [ 25.556462] random: sshd: uninitialized urandom read (32 bytes read) [ 26.313302] sshd (4533) used greatest stack depth: 16744 bytes left [ 26.329645] random: sshd: uninitialized urandom read (32 bytes read) [ 26.492159] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.33' (ECDSA) to the list of known hosts. [ 32.022928] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 32.115069] WARNING: CPU: 0 PID: 4546 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 32.123462] Kernel panic - not syncing: panic_on_warn set ... [ 32.123462] [ 32.130809] CPU: 0 PID: 4546 Comm: syz-executor054 Not tainted 4.17.0-rc6+ #59 [ 32.138144] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.147476] Call Trace: [ 32.150100] dump_stack+0x1b9/0x294 [ 32.153711] ? dump_stack_print_info.cold.2+0x52/0x52 [ 32.158889] ? smc_unhash_sk+0x270/0x4a0 [ 32.162932] panic+0x22f/0x4de [ 32.166104] ? add_taint.cold.5+0x16/0x16 [ 32.170232] ? __warn.cold.8+0x148/0x1b3 [ 32.174273] ? __warn.cold.8+0x117/0x1b3 [ 32.178325] ? smc_unhash_sk+0x345/0x4a0 [ 32.182365] __warn.cold.8+0x163/0x1b3 [ 32.186233] ? smc_unhash_sk+0x345/0x4a0 [ 32.190279] report_bug+0x252/0x2d0 [ 32.193888] do_error_trap+0x1de/0x490 [ 32.197767] ? graph_lock+0x170/0x170 [ 32.201560] ? math_error+0x420/0x420 [ 32.205345] ? lock_acquire+0x1dc/0x520 [ 32.209316] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.214140] do_invalid_op+0x1b/0x20 [ 32.217835] invalid_op+0x14/0x20 [ 32.221271] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 32.225916] RSP: 0018:ffff8801ac55f488 EFLAGS: 00010293 [ 32.231266] RAX: ffff8801ac578380 RBX: ffff8801ace257c0 RCX: ffffffff8741441e [ 32.238516] RDX: 0000000000000000 RSI: ffffffff874144d5 RDI: 0000000000000005 [ 32.245764] RBP: ffff8801ac55f570 R08: ffff8801ac578380 R09: ffffed00359c4b08 [ 32.253025] R10: ffffed00359c4b08 R11: ffff8801ace25843 R12: 1ffff100358abe95 [ 32.260287] R13: ffff8801ac55f548 R14: ffffffff8970da60 R15: ffff8801ace25840 [ 32.267556] ? smc_unhash_sk+0x28e/0x4a0 [ 32.271600] ? smc_unhash_sk+0x345/0x4a0 [ 32.275641] ? smc_unhash_sk+0x345/0x4a0 [ 32.279683] ? smc_rx_data_available+0x100/0x100 [ 32.284422] ? release_sock+0x1e2/0x2b0 [ 32.288397] ? __local_bh_enable_ip+0x161/0x230 [ 32.293050] ? __release_sock+0x3a0/0x3a0 [ 32.297179] ? smc_release+0x269/0x610 [ 32.301059] ? trace_hardirqs_on+0xd/0x10 [ 32.305187] ? __local_bh_enable_ip+0x161/0x230 [ 32.309848] smc_release+0x36e/0x610 [ 32.313556] sock_release+0x96/0x1b0 [ 32.317255] ? sock_alloc_file+0x4e0/0x4e0 [ 32.321468] sock_close+0x16/0x20 [ 32.324904] __fput+0x34d/0x890 [ 32.328164] ? fput+0x1a0/0x1a0 [ 32.331428] ? _raw_spin_unlock_irq+0x27/0x70 [ 32.336079] ____fput+0x15/0x20 [ 32.339342] task_work_run+0x1e4/0x290 [ 32.343211] ? task_work_cancel+0x240/0x240 [ 32.347516] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 32.353033] ? switch_task_namespaces+0xa2/0xd0 [ 32.357683] do_exit+0x1aee/0x2730 [ 32.361240] ? mm_update_next_owner+0x980/0x980 [ 32.365891] ? kasan_check_write+0x14/0x20 [ 32.370117] ? do_raw_spin_lock+0xc1/0x200 [ 32.374332] ? trace_hardirqs_off+0xd/0x10 [ 32.378548] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 32.383644] ? debug_check_no_obj_freed+0x2ff/0x584 [ 32.388641] ? __local_bh_enable_ip+0x161/0x230 [ 32.393296] ? kasan_check_read+0x11/0x20 [ 32.397440] ? rcu_is_watching+0x85/0x140 [ 32.401569] ? rcu_pm_notify+0xc0/0xc0 [ 32.405450] ? ___sys_sendmsg+0x31a/0x940 [ 32.409587] ? kfree+0x1e9/0x260 [ 32.412934] ? ___sys_sendmsg+0x31f/0x940 [ 32.417063] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.422583] ? copy_msghdr_from_user+0x560/0x560 [ 32.427325] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 32.432061] ? graph_lock+0x170/0x170 [ 32.435843] ? find_held_lock+0x36/0x1c0 [ 32.439888] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.445404] ? __fget_light+0x2ef/0x430 [ 32.449360] ? fget_raw+0x20/0x20 [ 32.452792] ? find_held_lock+0x36/0x1c0 [ 32.456972] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.462509] ? sockfd_lookup_light+0xc5/0x160 [ 32.466986] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.472502] ? __sys_sendmsg+0x1aa/0x270 [ 32.476541] ? __ia32_sys_shutdown+0x80/0x80 [ 32.480932] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.486448] ? __do_page_fault+0x441/0xe40 [ 32.490664] do_group_exit+0x16f/0x430 [ 32.494562] ? __ia32_sys_exit+0x50/0x50 [ 32.498617] ? do_syscall_64+0x92/0x800 [ 32.502577] __x64_sys_exit_group+0x3e/0x50 [ 32.506882] do_syscall_64+0x1b1/0x800 [ 32.510751] ? syscall_return_slowpath+0x5c0/0x5c0 [ 32.515660] ? syscall_return_slowpath+0x30f/0x5c0 [ 32.520573] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 32.525921] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.530750] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 32.535917] RIP: 0033:0x43ea08 [ 32.539087] RSP: 002b:00007ffc47e83698 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 32.546779] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ea08 [ 32.554043] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 32.561492] RBP: 00000000004be3a0 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 32.568751] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 32.576000] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 32.583824] Dumping ftrace buffer: [ 32.587446] (ftrace buffer empty) [ 32.591139] Kernel Offset: disabled [ 32.594752] Rebooting in 86400 seconds..