[....] Starting OpenBSD Secure Shell server: sshd[ 22.087319] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.830426] random: sshd: uninitialized urandom read (32 bytes read) [ 24.268203] sshd (4531) used greatest stack depth: 16936 bytes left [ 24.287277] random: sshd: uninitialized urandom read (32 bytes read) [ 25.099704] random: sshd: uninitialized urandom read (32 bytes read) [ 33.431980] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.26' (ECDSA) to the list of known hosts. [ 38.914608] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 39.023530] WARNING: CPU: 1 PID: 4550 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 39.031991] Kernel panic - not syncing: panic_on_warn set ... [ 39.031991] [ 39.039368] CPU: 1 PID: 4550 Comm: syz-executor462 Not tainted 4.17.0-rc3+ #37 [ 39.046772] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.056155] Call Trace: [ 39.058880] dump_stack+0x1b9/0x294 [ 39.062596] ? dump_stack_print_info.cold.2+0x52/0x52 [ 39.067797] ? smc_unhash_sk+0x320/0x4a0 [ 39.071976] panic+0x22f/0x4de [ 39.075191] ? add_taint.cold.5+0x16/0x16 [ 39.079351] ? __warn.cold.8+0x148/0x1b3 [ 39.083449] ? __warn.cold.8+0x117/0x1b3 [ 39.087540] ? smc_unhash_sk+0x345/0x4a0 [ 39.091683] __warn.cold.8+0x163/0x1b3 [ 39.096166] ? smc_unhash_sk+0x345/0x4a0 [ 39.100233] report_bug+0x252/0x2d0 [ 39.104034] do_error_trap+0x1de/0x490 [ 39.107931] ? graph_lock+0x170/0x170 [ 39.111854] ? math_error+0x420/0x420 [ 39.115661] ? lock_acquire+0x1dc/0x520 [ 39.119796] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.124644] do_invalid_op+0x1b/0x20 [ 39.128392] invalid_op+0x14/0x20 [ 39.131973] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 39.136668] RSP: 0018:ffff8801c27cf488 EFLAGS: 00010293 [ 39.142250] RAX: ffff8801d90fe080 RBX: ffff8801d92ee7c0 RCX: ffffffff873f756e [ 39.149553] RDX: 0000000000000000 RSI: ffffffff873f7625 RDI: 0000000000000005 [ 39.156844] RBP: ffff8801c27cf570 R08: ffff8801d90fe080 R09: ffffed003b25dd08 [ 39.164134] R10: ffffed003b25dd08 R11: ffff8801d92ee843 R12: 1ffff100384f9e95 [ 39.171412] R13: ffff8801c27cf548 R14: ffffffff8970b1e0 R15: ffff8801d92ee840 [ 39.178809] ? smc_unhash_sk+0x28e/0x4a0 [ 39.182962] ? smc_unhash_sk+0x345/0x4a0 [ 39.187037] ? smc_unhash_sk+0x345/0x4a0 [ 39.191119] ? smc_rx_data_available+0x100/0x100 [ 39.195883] ? release_sock+0x1e2/0x2b0 [ 39.199877] ? __local_bh_enable_ip+0x161/0x230 [ 39.204737] ? __release_sock+0x3a0/0x3a0 [ 39.208904] ? smc_release+0x269/0x610 [ 39.212820] ? trace_hardirqs_on+0xd/0x10 [ 39.216968] ? __local_bh_enable_ip+0x161/0x230 [ 39.221634] smc_release+0x36e/0x610 [ 39.225354] sock_release+0x96/0x1b0 [ 39.229189] ? sock_alloc_file+0x4e0/0x4e0 [ 39.233431] sock_close+0x16/0x20 [ 39.236881] __fput+0x34d/0x890 [ 39.240176] ? fput+0x1a0/0x1a0 [ 39.243474] ? _raw_spin_unlock_irq+0x27/0x70 [ 39.247970] ____fput+0x15/0x20 [ 39.251250] task_work_run+0x1e4/0x290 [ 39.255132] ? task_work_cancel+0x240/0x240 [ 39.259458] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 39.266520] ? switch_task_namespaces+0xa2/0xd0 [ 39.271234] do_exit+0x1aee/0x2730 [ 39.275001] ? mm_update_next_owner+0x980/0x980 [ 39.279702] ? lock_downgrade+0x8e0/0x8e0 [ 39.284451] ? noop_count+0x40/0x40 [ 39.288112] ? lock_pin_lock+0x350/0x350 [ 39.293258] ? kasan_check_read+0x11/0x20 [ 39.297441] ? rcu_is_watching+0x85/0x140 [ 39.301639] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 39.306899] ? is_bpf_text_address+0xd7/0x170 [ 39.312134] ? check_usage_backwards+0x151/0x3a0 [ 39.316927] ? graph_lock+0x170/0x170 [ 39.320789] ? graph_lock+0x170/0x170 [ 39.324984] ? find_held_lock+0x36/0x1c0 [ 39.329091] ? lock_downgrade+0x8e0/0x8e0 [ 39.333284] ? kasan_check_read+0x11/0x20 [ 39.338074] ? do_raw_spin_unlock+0x9e/0x2e0 [ 39.342528] ? __local_bh_enable_ip+0x161/0x230 [ 39.347417] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 39.352464] ? release_sock+0x1e2/0x2b0 [ 39.356493] ? trace_hardirqs_on+0xd/0x10 [ 39.360790] ? __local_bh_enable_ip+0x161/0x230 [ 39.365758] ? _raw_spin_unlock_bh+0x30/0x40 [ 39.370284] ? release_sock+0x1e2/0x2b0 [ 39.374301] ? __release_sock+0x3a0/0x3a0 [ 39.378571] ? __local_bh_enable_ip+0x161/0x230 [ 39.383283] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 39.388506] ? smc_setsockopt+0x1ed/0x630 [ 39.392694] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.398619] ? __sys_setsockopt+0x24f/0x390 [ 39.403028] do_group_exit+0x16f/0x430 [ 39.406954] ? mm_fault_error+0x380/0x380 [ 39.411136] ? __ia32_sys_exit+0x50/0x50 [ 39.415229] ? do_syscall_64+0x92/0x800 [ 39.419232] __x64_sys_exit_group+0x3e/0x50 [ 39.423917] do_syscall_64+0x1b1/0x800 [ 39.427951] ? syscall_return_slowpath+0x5c0/0x5c0 [ 39.432917] ? syscall_return_slowpath+0x30f/0x5c0 [ 39.437890] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 39.443293] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.448179] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 39.453399] RIP: 0033:0x43e8d8 [ 39.456607] RSP: 002b:00007ffe8af97228 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 39.464334] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 39.471632] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 39.479258] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 39.486661] R10: 0000000020000600 R11: 0000000000000246 R12: 0000000000000001 [ 39.494013] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 39.502160] Dumping ftrace buffer: [ 39.506088] (ftrace buffer empty) [ 39.509817] Kernel Offset: disabled [ 39.513471] Rebooting in 86400 seconds..