[....] Starting OpenBSD Secure Shell server: sshd[ 19.695664] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.486837] random: sshd: uninitialized urandom read (32 bytes read) [ 23.822963] random: sshd: uninitialized urandom read (32 bytes read) [ 24.594605] random: sshd: uninitialized urandom read (32 bytes read) [ 24.740437] sshd (4516) used greatest stack depth: 16584 bytes left [ 24.761155] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.13' (ECDSA) to the list of known hosts. [ 30.225060] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 30.325692] WARNING: CPU: 1 PID: 4526 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 30.334106] Kernel panic - not syncing: panic_on_warn set ... [ 30.334106] [ 30.341468] CPU: 1 PID: 4526 Comm: syz-executor881 Not tainted 4.17.0-rc3+ #34 [ 30.348815] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.358161] Call Trace: [ 30.360741] dump_stack+0x1b9/0x294 [ 30.364364] ? dump_stack_print_info.cold.2+0x52/0x52 [ 30.369555] ? smc_unhash_sk+0x310/0x4a0 [ 30.373613] panic+0x22f/0x4de [ 30.376798] ? add_taint.cold.5+0x16/0x16 [ 30.380948] ? __warn.cold.8+0x148/0x1b3 [ 30.385013] ? __warn.cold.8+0x117/0x1b3 [ 30.389078] ? smc_unhash_sk+0x345/0x4a0 [ 30.393134] __warn.cold.8+0x163/0x1b3 [ 30.397029] ? smc_unhash_sk+0x345/0x4a0 [ 30.401090] report_bug+0x252/0x2d0 [ 30.404708] do_error_trap+0x1de/0x490 [ 30.408600] ? graph_lock+0x170/0x170 [ 30.412392] ? math_error+0x420/0x420 [ 30.416187] ? lock_acquire+0x1dc/0x520 [ 30.420163] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.425016] do_invalid_op+0x1b/0x20 [ 30.428732] invalid_op+0x14/0x20 [ 30.432181] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 30.436827] RSP: 0018:ffff8801ae3df488 EFLAGS: 00010293 [ 30.442174] RAX: ffff8801ae2600c0 RBX: ffff8801ae0547c0 RCX: ffffffff87402b7e [ 30.449437] RDX: 0000000000000000 RSI: ffffffff87402c35 RDI: 0000000000000005 [ 30.456703] RBP: ffff8801ae3df570 R08: ffff8801ae2600c0 R09: ffffed0035c0a908 [ 30.463960] R10: ffffed0035c0a908 R11: ffff8801ae054843 R12: 1ffff10035c7be95 [ 30.471219] R13: ffff8801ae3df548 R14: ffffffff8970e8a0 R15: ffff8801ae054840 [ 30.478492] ? smc_unhash_sk+0x28e/0x4a0 [ 30.482549] ? smc_unhash_sk+0x345/0x4a0 [ 30.486607] ? smc_unhash_sk+0x345/0x4a0 [ 30.490662] ? smc_rx_data_available+0x100/0x100 [ 30.495409] ? release_sock+0x1e2/0x2b0 [ 30.499390] ? __local_bh_enable_ip+0x161/0x230 [ 30.504044] ? __release_sock+0x3a0/0x3a0 [ 30.508174] ? smc_release+0x269/0x610 [ 30.512049] ? trace_hardirqs_on+0xd/0x10 [ 30.516178] ? __local_bh_enable_ip+0x161/0x230 [ 30.520930] smc_release+0x36e/0x610 [ 30.524641] sock_release+0x96/0x1b0 [ 30.528349] ? sock_alloc_file+0x4e0/0x4e0 [ 30.532577] sock_close+0x16/0x20 [ 30.536030] __fput+0x34d/0x890 [ 30.539320] ? fput+0x1a0/0x1a0 [ 30.542593] ? _raw_spin_unlock_irq+0x27/0x70 [ 30.547084] ____fput+0x15/0x20 [ 30.550355] task_work_run+0x1e4/0x290 [ 30.554236] ? task_work_cancel+0x240/0x240 [ 30.558551] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 30.564089] ? switch_task_namespaces+0xa2/0xd0 [ 30.568751] do_exit+0x1aee/0x2730 [ 30.572281] ? mm_update_next_owner+0x980/0x980 [ 30.576948] ? lock_downgrade+0x8e0/0x8e0 [ 30.581086] ? lock_downgrade+0x8e0/0x8e0 [ 30.585229] ? kasan_check_read+0x11/0x20 [ 30.589370] ? do_raw_spin_unlock+0x9e/0x2e0 [ 30.593773] ? __local_bh_enable_ip+0x161/0x230 [ 30.598435] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.603448] ? release_sock+0x1e2/0x2b0 [ 30.607415] ? trace_hardirqs_on+0xd/0x10 [ 30.611557] ? __local_bh_enable_ip+0x161/0x230 [ 30.616235] ? _raw_spin_unlock_bh+0x30/0x40 [ 30.620638] ? release_sock+0x1e2/0x2b0 [ 30.624607] ? __release_sock+0x3a0/0x3a0 [ 30.628752] ? __local_bh_enable_ip+0x161/0x230 [ 30.633427] ? do_tcp_setsockopt.isra.41+0x1fb/0x2680 [ 30.638619] ? tcp_peek_len+0x2c0/0x2c0 [ 30.642601] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 30.648153] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.653690] ? __fget_light+0x2ef/0x430 [ 30.657676] ? __sys_sendmmsg+0x4b3/0x6f0 [ 30.661829] ? fget_raw+0x20/0x20 [ 30.665297] ? tcp_setsockopt+0x9a/0xe0 [ 30.669273] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 30.674821] ? sock_common_setsockopt+0x9a/0xe0 [ 30.679480] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.684999] ? smc_setsockopt+0x1ed/0x630 [ 30.689141] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.694661] ? __sys_setsockopt+0x24f/0x390 [ 30.698994] do_group_exit+0x16f/0x430 [ 30.702890] ? mm_fault_error+0x380/0x380 [ 30.707053] ? __ia32_sys_exit+0x50/0x50 [ 30.711119] ? do_syscall_64+0x92/0x800 [ 30.715080] __x64_sys_exit_group+0x3e/0x50 [ 30.719393] do_syscall_64+0x1b1/0x800 [ 30.723269] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 30.728116] ? syscall_return_slowpath+0x5c0/0x5c0 [ 30.733050] ? syscall_return_slowpath+0x30f/0x5c0 [ 30.737973] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 30.743322] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.748149] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.753321] RIP: 0033:0x43ed58 [ 30.756500] RSP: 002b:00007fff96d77a18 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 30.764199] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ed58 [ 30.771469] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 30.778736] RBP: 00000000004be700 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 30.785995] R10: 0000000020000940 R11: 0000000000000246 R12: 0000000000000001 [ 30.793303] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 30.801310] Dumping ftrace buffer: [ 30.805054] (ftrace buffer empty) [ 30.808765] Kernel Offset: disabled [ 30.812394] Rebooting in 86400 seconds..