[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.281156] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.996224] random: sshd: uninitialized urandom read (32 bytes read) [ 26.598686] random: sshd: uninitialized urandom read (32 bytes read) [ 27.352234] random: sshd: uninitialized urandom read (32 bytes read) [ 27.510913] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.29' (ECDSA) to the list of known hosts. [ 32.935519] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 33.026904] WARNING: CPU: 0 PID: 4551 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 33.035285] Kernel panic - not syncing: panic_on_warn set ... [ 33.035285] [ 33.042635] CPU: 0 PID: 4551 Comm: syz-executor432 Not tainted 4.17.0-rc3+ #37 [ 33.049972] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.059307] Call Trace: [ 33.061881] dump_stack+0x1b9/0x294 [ 33.065490] ? dump_stack_print_info.cold.2+0x52/0x52 [ 33.070663] ? smc_unhash_sk+0x320/0x4a0 [ 33.074720] panic+0x22f/0x4de [ 33.077891] ? add_taint.cold.5+0x16/0x16 [ 33.082042] ? __warn.cold.8+0x148/0x1b3 [ 33.086094] ? __warn.cold.8+0x117/0x1b3 [ 33.090139] ? smc_unhash_sk+0x345/0x4a0 [ 33.094199] __warn.cold.8+0x163/0x1b3 [ 33.098098] ? smc_unhash_sk+0x345/0x4a0 [ 33.102187] report_bug+0x252/0x2d0 [ 33.105797] do_error_trap+0x1de/0x490 [ 33.109670] ? graph_lock+0x170/0x170 [ 33.113473] ? math_error+0x420/0x420 [ 33.117264] ? lock_acquire+0x1dc/0x520 [ 33.121226] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.126067] do_invalid_op+0x1b/0x20 [ 33.129770] invalid_op+0x14/0x20 [ 33.133204] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 33.137849] RSP: 0018:ffff8801acc07488 EFLAGS: 00010293 [ 33.143196] RAX: ffff8801ad2b83c0 RBX: ffff8801d79757c0 RCX: ffffffff873f756e [ 33.150445] RDX: 0000000000000000 RSI: ffffffff873f7625 RDI: 0000000000000005 [ 33.157705] RBP: ffff8801acc07570 R08: ffff8801ad2b83c0 R09: ffffed003af2eb08 [ 33.164958] R10: ffffed003af2eb08 R11: ffff8801d7975843 R12: 1ffff10035980e95 [ 33.172210] R13: ffff8801acc07548 R14: ffffffff8970b1e0 R15: ffff8801d7975840 [ 33.179474] ? smc_unhash_sk+0x28e/0x4a0 [ 33.183524] ? smc_unhash_sk+0x345/0x4a0 [ 33.187578] ? smc_unhash_sk+0x345/0x4a0 [ 33.191623] ? smc_rx_data_available+0x100/0x100 [ 33.196362] ? release_sock+0x1e2/0x2b0 [ 33.200329] ? __local_bh_enable_ip+0x161/0x230 [ 33.204979] ? __release_sock+0x3a0/0x3a0 [ 33.209109] ? smc_release+0x269/0x610 [ 33.212976] ? trace_hardirqs_on+0xd/0x10 [ 33.217105] ? __local_bh_enable_ip+0x161/0x230 [ 33.221754] smc_release+0x36e/0x610 [ 33.225464] sock_release+0x96/0x1b0 [ 33.229177] ? sock_alloc_file+0x4e0/0x4e0 [ 33.233398] sock_close+0x16/0x20 [ 33.236837] __fput+0x34d/0x890 [ 33.240099] ? fput+0x1a0/0x1a0 [ 33.243363] ? _raw_spin_unlock_irq+0x27/0x70 [ 33.247854] ____fput+0x15/0x20 [ 33.251117] task_work_run+0x1e4/0x290 [ 33.254989] ? task_work_cancel+0x240/0x240 [ 33.259310] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 33.264835] ? switch_task_namespaces+0xa2/0xd0 [ 33.269491] do_exit+0x1aee/0x2730 [ 33.273029] ? mm_update_next_owner+0x980/0x980 [ 33.277689] ? lock_downgrade+0x8e0/0x8e0 [ 33.281816] ? noop_count+0x40/0x40 [ 33.285423] ? lock_pin_lock+0x350/0x350 [ 33.289471] ? kasan_check_read+0x11/0x20 [ 33.293608] ? rcu_is_watching+0x85/0x140 [ 33.297740] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 33.302912] ? is_bpf_text_address+0xd7/0x170 [ 33.307396] ? check_usage_backwards+0x151/0x3a0 [ 33.312136] ? graph_lock+0x170/0x170 [ 33.315927] ? graph_lock+0x170/0x170 [ 33.319715] ? find_held_lock+0x36/0x1c0 [ 33.324115] ? lock_downgrade+0x8e0/0x8e0 [ 33.328247] ? kasan_check_read+0x11/0x20 [ 33.332380] ? do_raw_spin_unlock+0x9e/0x2e0 [ 33.336775] ? __local_bh_enable_ip+0x161/0x230 [ 33.341423] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 33.346418] ? release_sock+0x1e2/0x2b0 [ 33.350373] ? trace_hardirqs_on+0xd/0x10 [ 33.354500] ? __local_bh_enable_ip+0x161/0x230 [ 33.359152] ? _raw_spin_unlock_bh+0x30/0x40 [ 33.363631] ? release_sock+0x1e2/0x2b0 [ 33.367586] ? __release_sock+0x3a0/0x3a0 [ 33.371717] ? __local_bh_enable_ip+0x161/0x230 [ 33.376375] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 33.381546] ? smc_setsockopt+0x1ed/0x630 [ 33.385675] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.391205] ? __sys_setsockopt+0x24f/0x390 [ 33.395516] do_group_exit+0x16f/0x430 [ 33.399390] ? mm_fault_error+0x380/0x380 [ 33.403521] ? __ia32_sys_exit+0x50/0x50 [ 33.407572] ? do_syscall_64+0x92/0x800 [ 33.411526] __x64_sys_exit_group+0x3e/0x50 [ 33.415836] do_syscall_64+0x1b1/0x800 [ 33.419711] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 33.424536] ? syscall_return_slowpath+0x5c0/0x5c0 [ 33.429449] ? syscall_return_slowpath+0x30f/0x5c0 [ 33.434364] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 33.439711] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.444537] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 33.449707] RIP: 0033:0x43e8b8 [ 33.452874] RSP: 002b:00007ffc7a510688 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 33.460648] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8b8 [ 33.467897] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 33.475248] RBP: 00000000004be260 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 33.482506] R10: 00000000200011c0 R11: 0000000000000246 R12: 0000000000000001 [ 33.489758] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 33.497636] Dumping ftrace buffer: [ 33.501278] (ftrace buffer empty) [ 33.504970] Kernel Offset: disabled [ 33.508589] Rebooting in 86400 seconds..