[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.423543] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.799812] random: sshd: uninitialized urandom read (32 bytes read) [ 24.216390] random: sshd: uninitialized urandom read (32 bytes read) [ 24.885146] random: sshd: uninitialized urandom read (32 bytes read) [ 25.040175] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.28' (ECDSA) to the list of known hosts. [ 30.530775] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 30.619158] WARNING: CPU: 1 PID: 4518 at include/net/sock.h:639 smc_unhash_sk+0x345/0x4a0 [ 30.627531] Kernel panic - not syncing: panic_on_warn set ... [ 30.627531] [ 30.634877] CPU: 1 PID: 4518 Comm: syz-executor149 Not tainted 4.17.0-rc2+ #23 [ 30.642212] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.651543] Call Trace: [ 30.654112] dump_stack+0x1b9/0x294 [ 30.657718] ? dump_stack_print_info.cold.2+0x52/0x52 [ 30.662889] ? smc_unhash_sk+0x2d0/0x4a0 [ 30.666930] panic+0x22f/0x4de [ 30.670101] ? add_taint.cold.5+0x16/0x16 [ 30.674228] ? __warn.cold.8+0x148/0x1b3 [ 30.678266] ? __warn.cold.8+0x117/0x1b3 [ 30.682306] ? smc_unhash_sk+0x345/0x4a0 [ 30.686344] __warn.cold.8+0x163/0x1b3 [ 30.690212] ? smc_unhash_sk+0x345/0x4a0 [ 30.694254] report_bug+0x252/0x2d0 [ 30.697862] do_error_trap+0x1de/0x490 [ 30.701726] ? graph_lock+0x170/0x170 [ 30.705504] ? math_error+0x420/0x420 [ 30.709289] ? lock_acquire+0x1dc/0x520 [ 30.713259] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.718088] do_invalid_op+0x1b/0x20 [ 30.721784] invalid_op+0x14/0x20 [ 30.725217] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 30.729858] RSP: 0018:ffff8801d92bf488 EFLAGS: 00010293 [ 30.735198] RAX: ffff8801ac02a500 RBX: ffff8801d92ca7c0 RCX: ffffffff873f89be [ 30.742442] RDX: 0000000000000000 RSI: ffffffff873f8a75 RDI: 0000000000000005 [ 30.749690] RBP: ffff8801d92bf570 R08: ffff8801ac02a500 R09: ffffed003b259508 [ 30.756938] R10: ffffed003b259508 R11: ffff8801d92ca843 R12: 1ffff1003b257e95 [ 30.764184] R13: ffff8801d92bf548 R14: ffffffff8970dea0 R15: ffff8801d92ca840 [ 30.771442] ? smc_unhash_sk+0x28e/0x4a0 [ 30.775486] ? smc_unhash_sk+0x345/0x4a0 [ 30.779527] ? smc_unhash_sk+0x345/0x4a0 [ 30.783567] ? smc_hash_sk+0x2f0/0x2f0 [ 30.787434] ? release_sock+0x1e2/0x2b0 [ 30.791394] ? __local_bh_enable_ip+0x161/0x230 [ 30.796046] ? __release_sock+0x3a0/0x3a0 [ 30.800178] ? smc_release+0x269/0x610 [ 30.804045] ? trace_hardirqs_on+0xd/0x10 [ 30.808174] ? __local_bh_enable_ip+0x161/0x230 [ 30.812823] smc_release+0x36e/0x610 [ 30.816517] sock_release+0x96/0x1b0 [ 30.820209] ? sock_alloc_file+0x4e0/0x4e0 [ 30.824420] sock_close+0x16/0x20 [ 30.827851] __fput+0x34d/0x890 [ 30.831111] ? fput+0x1a0/0x1a0 [ 30.834371] ? _raw_spin_unlock_irq+0x27/0x70 [ 30.838849] ____fput+0x15/0x20 [ 30.842117] task_work_run+0x1e4/0x290 [ 30.845983] ? task_work_cancel+0x240/0x240 [ 30.850287] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 30.855802] ? switch_task_namespaces+0xa2/0xd0 [ 30.860458] do_exit+0x1aee/0x2730 [ 30.863983] ? mm_update_next_owner+0x980/0x980 [ 30.868629] ? kasan_check_read+0x11/0x20 [ 30.872791] ? do_raw_spin_unlock+0x9e/0x2e0 [ 30.877177] ? __local_bh_enable_ip+0x161/0x230 [ 30.881826] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.886821] ? release_sock+0x1e2/0x2b0 [ 30.890771] ? trace_hardirqs_on+0xd/0x10 [ 30.894897] ? __local_bh_enable_ip+0x161/0x230 [ 30.899543] ? _raw_spin_unlock_bh+0x30/0x40 [ 30.903933] ? kasan_check_read+0x11/0x20 [ 30.908058] ? rcu_is_watching+0x85/0x140 [ 30.912185] ? rcu_pm_notify+0xc0/0xc0 [ 30.916056] ? ___sys_sendmsg+0x31a/0x940 [ 30.920183] ? kfree+0x1e9/0x260 [ 30.923527] ? ___sys_sendmsg+0x31f/0x940 [ 30.927658] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.933174] ? copy_msghdr_from_user+0x560/0x560 [ 30.937912] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 30.942649] ? graph_lock+0x170/0x170 [ 30.946448] ? find_held_lock+0x36/0x1c0 [ 30.950503] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 30.956033] ? sockfd_lookup_light+0xc5/0x160 [ 30.960510] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.966036] ? __sys_sendmsg+0x1aa/0x270 [ 30.970086] ? __ia32_sys_shutdown+0x80/0x80 [ 30.974474] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.979990] ? __do_page_fault+0x441/0xe40 [ 30.984211] do_group_exit+0x16f/0x430 [ 30.988078] ? __ia32_sys_exit+0x50/0x50 [ 30.992122] ? do_syscall_64+0x92/0x800 [ 30.996079] __x64_sys_exit_group+0x3e/0x50 [ 31.000379] do_syscall_64+0x1b1/0x800 [ 31.004246] ? syscall_return_slowpath+0x5c0/0x5c0 [ 31.009156] ? syscall_return_slowpath+0x30f/0x5c0 [ 31.014073] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 31.019420] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.024249] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.029418] RIP: 0033:0x43ea98 [ 31.032588] RSP: 002b:00007ffd00b5beb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 31.040274] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ea98 [ 31.047519] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 31.054768] RBP: 00000000004be480 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 31.062023] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 31.069277] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 31.077036] Dumping ftrace buffer: [ 31.080640] (ftrace buffer empty) [ 31.084324] Kernel Offset: disabled [ 31.087932] Rebooting in 86400 seconds..