[....] Starting OpenBSD Secure Shell server: sshd[ 19.243572] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.118499] random: sshd: uninitialized urandom read (32 bytes read) [ 21.408135] sshd (4465) used greatest stack depth: 16552 bytes left [ 21.424942] random: sshd: uninitialized urandom read (32 bytes read) [ 22.181329] random: sshd: uninitialized urandom read (32 bytes read) [ 22.339841] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.16' (ECDSA) to the list of known hosts. [ 27.776245] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 27.868436] WARNING: CPU: 1 PID: 4481 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 27.876845] Kernel panic - not syncing: panic_on_warn set ... [ 27.876845] [ 27.884198] CPU: 1 PID: 4481 Comm: syz-executor875 Not tainted 4.17.0-rc4+ #48 [ 27.891537] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.900874] Call Trace: [ 27.903448] dump_stack+0x1b9/0x294 [ 27.907068] ? dump_stack_print_info.cold.2+0x52/0x52 [ 27.912251] ? smc_unhash_sk+0x2b0/0x4a0 [ 27.916308] panic+0x22f/0x4de [ 27.919499] ? add_taint.cold.5+0x16/0x16 [ 27.923656] ? __warn.cold.8+0x148/0x1b3 [ 27.927716] ? __warn.cold.8+0x117/0x1b3 [ 27.931765] ? smc_unhash_sk+0x345/0x4a0 [ 27.935808] __warn.cold.8+0x163/0x1b3 [ 27.939684] ? smc_unhash_sk+0x345/0x4a0 [ 27.943739] report_bug+0x252/0x2d0 [ 27.947360] do_error_trap+0x1de/0x490 [ 27.951327] ? graph_lock+0x170/0x170 [ 27.955126] ? math_error+0x420/0x420 [ 27.958927] ? lock_acquire+0x1dc/0x520 [ 27.962889] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.967716] do_invalid_op+0x1b/0x20 [ 27.971417] invalid_op+0x14/0x20 [ 27.974855] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 27.980383] RSP: 0018:ffff8801b04a7488 EFLAGS: 00010293 [ 27.985731] RAX: ffff8801afda4600 RBX: ffff8801b038b7c0 RCX: ffffffff8740e9de [ 27.992987] RDX: 0000000000000000 RSI: ffffffff8740ea95 RDI: 0000000000000005 [ 28.000334] RBP: ffff8801b04a7570 R08: ffff8801afda4600 R09: ffffed0036071708 [ 28.007588] R10: ffffed0036071708 R11: ffff8801b038b843 R12: 1ffff10036094e95 [ 28.014848] R13: ffff8801b04a7548 R14: ffffffff8970d5e0 R15: ffff8801b038b840 [ 28.022138] ? smc_unhash_sk+0x28e/0x4a0 [ 28.026208] ? smc_unhash_sk+0x345/0x4a0 [ 28.030263] ? smc_unhash_sk+0x345/0x4a0 [ 28.034314] ? smc_rx_data_available+0x100/0x100 [ 28.039094] ? release_sock+0x1e2/0x2b0 [ 28.043062] ? __local_bh_enable_ip+0x161/0x230 [ 28.047720] ? __release_sock+0x3a0/0x3a0 [ 28.051861] ? smc_release+0x269/0x610 [ 28.055731] ? trace_hardirqs_on+0xd/0x10 [ 28.059872] ? __local_bh_enable_ip+0x161/0x230 [ 28.064532] smc_release+0x36e/0x610 [ 28.068242] sock_release+0x96/0x1b0 [ 28.071959] ? sock_alloc_file+0x4e0/0x4e0 [ 28.076194] sock_close+0x16/0x20 [ 28.079644] __fput+0x34d/0x890 [ 28.082932] ? fput+0x1a0/0x1a0 [ 28.086224] ? _raw_spin_unlock_irq+0x27/0x70 [ 28.090722] ____fput+0x15/0x20 [ 28.093992] task_work_run+0x1e4/0x290 [ 28.097865] ? task_work_cancel+0x240/0x240 [ 28.102172] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 28.107693] ? switch_task_namespaces+0xa2/0xd0 [ 28.112362] do_exit+0x1aee/0x2730 [ 28.115912] ? mm_update_next_owner+0x980/0x980 [ 28.120575] ? find_held_lock+0x36/0x1c0 [ 28.124622] ? lock_downgrade+0x8e0/0x8e0 [ 28.128751] ? lock_downgrade+0x8e0/0x8e0 [ 28.132884] ? kasan_check_read+0x11/0x20 [ 28.137023] ? do_raw_spin_unlock+0x9e/0x2e0 [ 28.141420] ? __local_bh_enable_ip+0x161/0x230 [ 28.146077] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 28.151110] ? release_sock+0x1e2/0x2b0 [ 28.155094] ? trace_hardirqs_on+0xd/0x10 [ 28.159248] ? __local_bh_enable_ip+0x161/0x230 [ 28.163911] ? _raw_spin_unlock_bh+0x30/0x40 [ 28.168308] ? release_sock+0x1e2/0x2b0 [ 28.172283] ? __release_sock+0x3a0/0x3a0 [ 28.176438] ? __local_bh_enable_ip+0x161/0x230 [ 28.181109] ? lock_sock_nested+0xe7/0x120 [ 28.185349] ? smc_sendmsg+0x2d5/0x370 [ 28.189222] ? smc_sendpage+0x1a0/0x1a0 [ 28.193201] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.198736] ? sock_sendmsg+0x5a/0x120 [ 28.202633] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.208178] ? __sys_sendto+0x475/0x670 [ 28.212143] ? __ia32_sys_getpeername+0xb0/0xb0 [ 28.216800] ? __fd_install+0x2de/0x880 [ 28.220769] ? get_unused_fd_flags+0x190/0x190 [ 28.225357] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.230892] ? alloc_file+0x44/0x3e0 [ 28.234607] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 28.240137] ? sock_alloc_file+0x2a4/0x4e0 [ 28.244365] ? __alloc_fd+0x700/0x700 [ 28.248156] ? fd_install+0x4d/0x60 [ 28.251772] do_group_exit+0x16f/0x430 [ 28.255653] ? __ia32_sys_exit+0x50/0x50 [ 28.259711] ? do_syscall_64+0x92/0x800 [ 28.263681] __x64_sys_exit_group+0x3e/0x50 [ 28.268005] do_syscall_64+0x1b1/0x800 [ 28.272584] ? syscall_return_slowpath+0x5c0/0x5c0 [ 28.277517] ? syscall_return_slowpath+0x30f/0x5c0 [ 28.282445] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 28.287814] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.292675] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 28.297856] RIP: 0033:0x43e8b8 [ 28.301033] RSP: 002b:00007ffec9cc9068 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 28.308751] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8b8 [ 28.316020] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 28.323280] RBP: 00000000004be260 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 28.330544] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 28.337809] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 28.345693] Dumping ftrace buffer: [ 28.349425] (ftrace buffer empty) [ 28.353127] Kernel Offset: disabled [ 28.356752] Rebooting in 86400 seconds..