[....] Starting OpenBSD Secure Shell server: sshd[ 18.532461] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.176215] random: sshd: uninitialized urandom read (32 bytes read) [ 21.434938] random: sshd: uninitialized urandom read (32 bytes read) [ 22.205972] random: sshd: uninitialized urandom read (32 bytes read) [ 31.693340] random: sshd: uninitialized urandom read (32 bytes read) [ 31.831538] sshd (4485) used greatest stack depth: 16584 bytes left Warning: Permanently added '10.128.10.44' (ECDSA) to the list of known hosts. [ 37.273637] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 37.362087] WARNING: CPU: 0 PID: 4492 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 37.370462] Kernel panic - not syncing: panic_on_warn set ... [ 37.370462] [ 37.377806] CPU: 0 PID: 4492 Comm: syz-executor430 Not tainted 4.17.0-rc4+ #45 [ 37.385138] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.394467] Call Trace: [ 37.397036] dump_stack+0x1b9/0x294 [ 37.400641] ? dump_stack_print_info.cold.2+0x52/0x52 [ 37.405813] ? smc_unhash_sk+0x330/0x4a0 [ 37.409855] panic+0x22f/0x4de [ 37.413024] ? add_taint.cold.5+0x16/0x16 [ 37.417155] ? __warn.cold.8+0x148/0x1b3 [ 37.421193] ? __warn.cold.8+0x117/0x1b3 [ 37.425240] ? smc_unhash_sk+0x345/0x4a0 [ 37.429278] __warn.cold.8+0x163/0x1b3 [ 37.433143] ? smc_unhash_sk+0x345/0x4a0 [ 37.437181] report_bug+0x252/0x2d0 [ 37.440786] do_error_trap+0x1de/0x490 [ 37.444652] ? graph_lock+0x170/0x170 [ 37.448429] ? math_error+0x420/0x420 [ 37.452210] ? lock_acquire+0x1dc/0x520 [ 37.456165] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 37.460988] do_invalid_op+0x1b/0x20 [ 37.464680] invalid_op+0x14/0x20 [ 37.468113] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 37.472756] RSP: 0018:ffff8801ad057488 EFLAGS: 00010293 [ 37.478099] RAX: ffff8801d916c140 RBX: ffff8801d95d07c0 RCX: ffffffff8740565e [ 37.485349] RDX: 0000000000000000 RSI: ffffffff87405715 RDI: 0000000000000005 [ 37.492599] RBP: ffff8801ad057570 R08: ffff8801d916c140 R09: ffffed003b2ba108 [ 37.499845] R10: ffffed003b2ba108 R11: ffff8801d95d0843 R12: 1ffff10035a0ae95 [ 37.507092] R13: ffff8801ad057548 R14: ffffffff8970cba0 R15: ffff8801d95d0840 [ 37.514348] ? smc_unhash_sk+0x28e/0x4a0 [ 37.518385] ? smc_unhash_sk+0x345/0x4a0 [ 37.522426] ? smc_unhash_sk+0x345/0x4a0 [ 37.526467] ? smc_rx_data_available+0x100/0x100 [ 37.531200] ? release_sock+0x1e2/0x2b0 [ 37.535152] ? __local_bh_enable_ip+0x161/0x230 [ 37.539798] ? __release_sock+0x3a0/0x3a0 [ 37.543928] ? smc_release+0x269/0x610 [ 37.547794] ? trace_hardirqs_on+0xd/0x10 [ 37.551920] ? __local_bh_enable_ip+0x161/0x230 [ 37.556568] smc_release+0x36e/0x610 [ 37.560261] sock_release+0x96/0x1b0 [ 37.563951] ? sock_alloc_file+0x4e0/0x4e0 [ 37.568164] sock_close+0x16/0x20 [ 37.571605] __fput+0x34d/0x890 [ 37.574865] ? fput+0x1a0/0x1a0 [ 37.578129] ? _raw_spin_unlock_irq+0x27/0x70 [ 37.582605] ____fput+0x15/0x20 [ 37.585864] task_work_run+0x1e4/0x290 [ 37.589729] ? task_work_cancel+0x240/0x240 [ 37.594030] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 37.599543] ? switch_task_namespaces+0xa2/0xd0 [ 37.604190] do_exit+0x1aee/0x2730 [ 37.607711] ? mm_update_next_owner+0x980/0x980 [ 37.612356] ? kasan_check_read+0x11/0x20 [ 37.616485] ? do_raw_spin_unlock+0x9e/0x2e0 [ 37.620872] ? __local_bh_enable_ip+0x161/0x230 [ 37.625520] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 37.630515] ? release_sock+0x1e2/0x2b0 [ 37.634467] ? trace_hardirqs_on+0xd/0x10 [ 37.638594] ? __local_bh_enable_ip+0x161/0x230 [ 37.643247] ? _raw_spin_unlock_bh+0x30/0x40 [ 37.647635] ? kasan_check_read+0x11/0x20 [ 37.651763] ? rcu_is_watching+0x85/0x140 [ 37.655888] ? rcu_pm_notify+0xc0/0xc0 [ 37.659758] ? ___sys_sendmsg+0x31a/0x940 [ 37.663883] ? kfree+0x1e9/0x260 [ 37.667227] ? ___sys_sendmsg+0x31f/0x940 [ 37.671353] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 37.676866] ? __handle_mm_fault+0x93a/0x4310 [ 37.681341] ? copy_msghdr_from_user+0x560/0x560 [ 37.686073] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 37.690807] ? graph_lock+0x170/0x170 [ 37.694586] ? find_held_lock+0x36/0x1c0 [ 37.698629] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 37.704151] ? __fget_light+0x2ef/0x430 [ 37.708103] ? fget_raw+0x20/0x20 [ 37.711531] ? find_held_lock+0x36/0x1c0 [ 37.715575] ? lock_downgrade+0x8e0/0x8e0 [ 37.719697] ? handle_mm_fault+0x8c0/0xc70 [ 37.723913] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 37.729427] ? sockfd_lookup_light+0xc5/0x160 [ 37.733904] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 37.739417] ? __sys_sendmsg+0x1aa/0x270 [ 37.743456] ? __ia32_sys_shutdown+0x80/0x80 [ 37.747846] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 37.753360] ? __do_page_fault+0x441/0xe40 [ 37.757585] do_group_exit+0x16f/0x430 [ 37.761451] ? __ia32_sys_exit+0x50/0x50 [ 37.765490] ? do_syscall_64+0x92/0x800 [ 37.769443] __x64_sys_exit_group+0x3e/0x50 [ 37.773744] do_syscall_64+0x1b1/0x800 [ 37.777608] ? syscall_return_slowpath+0x5c0/0x5c0 [ 37.782518] ? syscall_return_slowpath+0x30f/0x5c0 [ 37.787429] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 37.792773] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 37.797596] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 37.802761] RIP: 0033:0x43e9e8 [ 37.805926] RSP: 002b:00007ffdf0030de8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 37.813614] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e9e8 [ 37.820860] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 37.828104] RBP: 00000000004be380 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 37.835351] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 37.842598] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 37.850374] Dumping ftrace buffer: [ 37.853980] (ftrace buffer empty) [ 37.857671] Kernel Offset: disabled [ 37.861278] Rebooting in 86400 seconds..