[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.321776] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.043176] random: sshd: uninitialized urandom read (32 bytes read) [ 18.354892] random: sshd: uninitialized urandom read (32 bytes read) [ 19.102903] random: sshd: uninitialized urandom read (32 bytes read) [ 21.338868] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.40' (ECDSA) to the list of known hosts. [ 26.886478] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 26.970698] WARNING: CPU: 1 PID: 4458 at include/net/sock.h:660 smc_unhash_sk+0x357/0x4b0 [ 26.979048] Kernel panic - not syncing: panic_on_warn set ... [ 26.979048] [ 26.986535] CPU: 1 PID: 4458 Comm: syz-executor800 Not tainted 4.18.0-rc3+ #131 [ 26.993991] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.003343] Call Trace: [ 27.005927] dump_stack+0x1c9/0x2b4 [ 27.009549] ? dump_stack_print_info.cold.2+0x52/0x52 [ 27.014747] panic+0x238/0x4e7 [ 27.017943] ? add_taint.cold.5+0x16/0x16 [ 27.022094] ? __warn.cold.8+0x148/0x1ba [ 27.026183] ? __warn.cold.8+0x117/0x1ba [ 27.030249] ? smc_unhash_sk+0x357/0x4b0 [ 27.034321] __warn.cold.8+0x163/0x1ba [ 27.038203] ? smc_unhash_sk+0x357/0x4b0 [ 27.042292] report_bug+0x252/0x2d0 [ 27.045922] do_error_trap+0x1fc/0x4d0 [ 27.049808] ? math_error+0x3e0/0x3e0 [ 27.053608] ? kasan_check_write+0x14/0x20 [ 27.057887] ? do_raw_spin_lock+0xc1/0x200 [ 27.062153] ? lock_acquire+0x1e4/0x540 [ 27.066158] ? smc_unhash_sk+0xd7/0x4b0 [ 27.070140] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.074984] do_invalid_op+0x1b/0x20 [ 27.078713] invalid_op+0x14/0x20 [ 27.082158] RIP: 0010:smc_unhash_sk+0x357/0x4b0 [ 27.086819] Code: 48 8b 45 d0 65 48 33 04 25 28 00 00 00 0f 85 88 00 00 00 48 81 c4 c0 00 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 f9 16 18 fa <0f> 0b e9 47 ff ff ff 4c 89 ff 48 89 85 28 ff ff ff e8 d3 ef 55 fa [ 27.106045] RSP: 0018:ffff8801ac98f480 EFLAGS: 00010293 [ 27.111405] RAX: ffff8801acfbc180 RBX: ffff8801add7b140 RCX: ffffffff8763f416 [ 27.118673] RDX: 0000000000000000 RSI: ffffffff8763f4d7 RDI: 0000000000000005 [ 27.125952] RBP: ffff8801ac98f568 R08: ffff8801acfbc180 R09: ffffed0035baf638 [ 27.133212] R10: ffffed0035baf638 R11: ffff8801add7b1c3 R12: 1ffff10035931e94 [ 27.140469] R13: ffff8801ac98f540 R14: ffffffff89938760 R15: ffff8801add7b1c0 [ 27.147747] ? smc_unhash_sk+0x296/0x4b0 [ 27.151831] ? smc_unhash_sk+0x357/0x4b0 [ 27.155878] ? smc_rx_data_available+0x120/0x120 [ 27.160616] ? release_sock+0x1ec/0x2c0 [ 27.164579] ? do_raw_write_trylock+0x1c0/0x1c0 [ 27.169234] ? __release_sock+0x3a0/0x3a0 [ 27.173370] ? smc_release+0x2cb/0x680 [ 27.177263] ? trace_hardirqs_on+0xd/0x10 [ 27.181398] ? __local_bh_enable_ip+0x161/0x230 [ 27.186060] smc_release+0x3d1/0x680 [ 27.189772] __sock_release+0xd7/0x260 [ 27.193649] ? __sock_release+0x260/0x260 [ 27.197795] sock_close+0x19/0x20 [ 27.201356] __fput+0x355/0x8b0 [ 27.204621] ? fput+0x1a0/0x1a0 [ 27.207890] ? kasan_check_write+0x14/0x20 [ 27.212114] ? do_raw_spin_lock+0xc1/0x200 [ 27.216338] ____fput+0x15/0x20 [ 27.219615] task_work_run+0x1ec/0x2a0 [ 27.223486] ? task_work_cancel+0x250/0x250 [ 27.227796] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 27.233320] ? switch_task_namespaces+0xa2/0xd0 [ 27.237973] do_exit+0x1b08/0x2750 [ 27.241497] ? mm_update_next_owner+0x9a0/0x9a0 [ 27.246167] ? __local_bh_enable_ip+0x161/0x230 [ 27.250829] ? smc_sendmsg+0x2d5/0x370 [ 27.254720] ? smc_sendpage+0x1a0/0x1a0 [ 27.258684] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.264212] ? kfree+0x15e/0x260 [ 27.267579] ? ___sys_sendmsg+0x318/0x930 [ 27.271727] ? copy_msghdr_from_user+0x580/0x580 [ 27.276469] ? __lockdep_init_map+0x105/0x590 [ 27.280949] ? pud_val+0x88/0x100 [ 27.284410] ? pmd_val+0x100/0x100 [ 27.287951] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.293485] ? __fget_light+0x2f7/0x440 [ 27.297463] ? __handle_mm_fault+0x94b/0x4460 [ 27.301942] ? fget_raw+0x20/0x20 [ 27.305382] ? vmf_insert_mixed_mkwrite+0xa0/0xa0 [ 27.310221] ? __fd_install+0x2b2/0x880 [ 27.314227] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 27.319763] ? sockfd_lookup_light+0xc5/0x160 [ 27.324253] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.329774] ? __sys_sendmmsg+0x4b3/0x6f0 [ 27.333916] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 27.338223] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 27.343748] ? __handle_mm_fault+0x4460/0x4460 [ 27.348322] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.353865] ? __do_page_fault+0x449/0xe50 [ 27.358113] do_group_exit+0x177/0x440 [ 27.362009] ? mm_fault_error+0x380/0x380 [ 27.366155] ? __ia32_sys_exit+0x50/0x50 [ 27.370202] __x64_sys_exit_group+0x3e/0x50 [ 27.374508] do_syscall_64+0x1b9/0x820 [ 27.378379] ? syscall_return_slowpath+0x5e0/0x5e0 [ 27.383303] ? syscall_return_slowpath+0x31d/0x5e0 [ 27.388225] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 27.393237] ? prepare_exit_to_usermode+0x291/0x3b0 [ 27.398245] ? perf_trace_sys_enter+0xb10/0xb10 [ 27.402898] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.407737] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 27.412909] RIP: 0033:0x43ecb8 [ 27.416085] Code: Bad RIP value. [ 27.419455] RSP: 002b:00007ffd18578588 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 27.427160] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ecb8 [ 27.434439] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 27.441692] RBP: 00000000004be568 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 27.448942] R10: 0000000020004010 R11: 0000000000000246 R12: 0000000000000001 [ 27.456288] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 27.464330] Dumping ftrace buffer: [ 27.467865] (ftrace buffer empty) [ 27.471568] Kernel Offset: disabled [ 27.475177] Rebooting in 86400 seconds..