[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.389337] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.601254] random: sshd: uninitialized urandom read (32 bytes read) [ 25.045043] random: sshd: uninitialized urandom read (32 bytes read) [ 25.908583] random: sshd: uninitialized urandom read (32 bytes read) [ 26.065838] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.30' (ECDSA) to the list of known hosts. [ 31.564119] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.654522] WARNING: CPU: 0 PID: 4538 at include/net/sock.h:644 smc_unhash_sk+0x357/0x4b0 [ 31.662932] Kernel panic - not syncing: panic_on_warn set ... [ 31.662932] [ 31.670286] CPU: 0 PID: 4538 Comm: syz-executor408 Not tainted 4.18.0-rc4+ #142 [ 31.677711] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.687059] Call Trace: [ 31.689649] dump_stack+0x1c9/0x2b4 [ 31.693257] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.698441] panic+0x238/0x4e7 [ 31.701630] ? add_taint.cold.5+0x16/0x16 [ 31.705766] ? __warn.cold.8+0x148/0x1ba [ 31.709809] ? __warn.cold.8+0x117/0x1ba [ 31.713851] ? smc_unhash_sk+0x357/0x4b0 [ 31.717888] __warn.cold.8+0x163/0x1ba [ 31.721753] ? smc_unhash_sk+0x357/0x4b0 [ 31.725797] report_bug+0x252/0x2d0 [ 31.729406] do_error_trap+0x1fc/0x4d0 [ 31.733273] ? math_error+0x3e0/0x3e0 [ 31.737053] ? print_usage_bug+0xc0/0xc0 [ 31.741094] ? lock_acquire+0x1e4/0x540 [ 31.745061] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.749884] do_invalid_op+0x1b/0x20 [ 31.753587] invalid_op+0x14/0x20 [ 31.757020] RIP: 0010:smc_unhash_sk+0x357/0x4b0 [ 31.761659] 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 e9 52 1a fa <0f> 0b e9 47 ff ff ff 4c 89 ff 48 89 85 28 ff ff ff e8 03 2d 58 fa [ 31.780826] RSP: 0018:ffff8801b390f480 EFLAGS: 00010293 [ 31.786178] RAX: ffff8801ab70e4c0 RBX: ffff8801d89830c0 RCX: ffffffff8761b7f6 [ 31.793426] RDX: 0000000000000000 RSI: ffffffff8761b8b7 RDI: 0000000000000005 [ 31.800674] RBP: ffff8801b390f568 R08: ffff8801ab70e4c0 R09: ffffed003b130628 [ 31.807923] R10: ffffed003b130628 R11: ffff8801d8983143 R12: 1ffff10036721e94 [ 31.815168] R13: ffff8801b390f540 R14: ffffffff899372c0 R15: ffff8801d8983140 [ 31.822427] ? smc_unhash_sk+0x296/0x4b0 [ 31.826463] ? smc_unhash_sk+0x357/0x4b0 [ 31.830637] ? smc_rx_data_available+0x120/0x120 [ 31.835372] ? release_sock+0x1ec/0x2c0 [ 31.839326] ? __local_bh_enable_ip+0x161/0x230 [ 31.843970] ? __release_sock+0x3a0/0x3a0 [ 31.848097] ? smc_release+0x2c9/0x670 [ 31.851964] ? trace_hardirqs_on+0xd/0x10 [ 31.856090] ? __local_bh_enable_ip+0x161/0x230 [ 31.860742] smc_release+0x3cf/0x670 [ 31.864438] __sock_release+0xd7/0x260 [ 31.868305] ? __sock_release+0x260/0x260 [ 31.872433] sock_close+0x19/0x20 [ 31.875873] __fput+0x355/0x8b0 [ 31.879143] ? fput+0x1a0/0x1a0 [ 31.882407] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.886892] ____fput+0x15/0x20 [ 31.890151] task_work_run+0x1ec/0x2a0 [ 31.894018] ? task_work_cancel+0x250/0x250 [ 31.898322] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 31.903838] ? switch_task_namespaces+0xa2/0xd0 [ 31.908484] do_exit+0x1b08/0x2750 [ 31.912008] ? lock_downgrade+0x8d1/0x8f0 [ 31.916142] ? mm_update_next_owner+0x9a0/0x9a0 [ 31.920801] ? kasan_check_read+0x11/0x20 [ 31.924927] ? do_raw_spin_unlock+0xa7/0x2f0 [ 31.929312] ? __local_bh_enable_ip+0x161/0x230 [ 31.933962] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.938965] ? release_sock+0x1ec/0x2c0 [ 31.942918] ? trace_hardirqs_on+0xd/0x10 [ 31.947044] ? __local_bh_enable_ip+0x161/0x230 [ 31.951692] ? _raw_spin_unlock_bh+0x30/0x40 [ 31.956079] ? kasan_check_read+0x11/0x20 [ 31.960207] ? rcu_is_watching+0x8c/0x150 [ 31.964331] ? rcu_pm_notify+0xc0/0xc0 [ 31.968200] ? ___sys_sendmsg+0x313/0x930 [ 31.972328] ? rcu_read_lock_sched_held+0x108/0x120 [ 31.977321] ? kfree+0x1e9/0x260 [ 31.980677] ? ___sys_sendmsg+0x318/0x930 [ 31.984808] ? graph_lock+0x170/0x170 [ 31.988592] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.994105] ? __fget_light+0x2f7/0x440 [ 31.998079] ? fget_raw+0x20/0x20 [ 32.001517] ? lock_downgrade+0x8f0/0x8f0 [ 32.005644] ? handle_mm_fault+0x8c4/0xc80 [ 32.009859] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.015376] ? sockfd_lookup_light+0xc5/0x160 [ 32.019851] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.025367] ? __sys_sendmsg+0x1ba/0x290 [ 32.029410] ? __ia32_sys_shutdown+0x80/0x80 [ 32.033797] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.039313] ? __do_page_fault+0x449/0xe50 [ 32.043527] do_group_exit+0x177/0x440 [ 32.047397] ? __ia32_sys_exit+0x50/0x50 [ 32.051442] ? do_syscall_64+0x9a/0x820 [ 32.055393] __x64_sys_exit_group+0x3e/0x50 [ 32.059690] do_syscall_64+0x1b9/0x820 [ 32.063569] ? syscall_return_slowpath+0x5e0/0x5e0 [ 32.068477] ? syscall_return_slowpath+0x31d/0x5e0 [ 32.073388] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 32.078731] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.083565] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 32.088739] RIP: 0033:0x43ecf8 [ 32.092597] Code: Bad RIP value. [ 32.095949] RSP: 002b:00007fffc77ee8a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 32.103636] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ecf8 [ 32.110882] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 32.118130] RBP: 00000000004be5a8 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 32.125379] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 32.132626] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 32.140464] Dumping ftrace buffer: [ 32.144081] (ftrace buffer empty) [ 32.147777] Kernel Offset: disabled [ 32.151388] Rebooting in 86400 seconds..