[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.527285] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 [ 20.738981] random: sshd: uninitialized urandom read (32 bytes read) syzkaller login: [ 21.118209] random: sshd: uninitialized urandom read (32 bytes read) [ 21.904213] random: sshd: uninitialized urandom read (32 bytes read) [ 22.067992] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.55' (ECDSA) to the list of known hosts. [ 27.531920] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 27.775000] kasan: CONFIG_KASAN_INLINE enabled [ 27.779936] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 27.787652] general protection fault: 0000 [#1] SMP KASAN [ 27.793227] Dumping ftrace buffer: [ 27.796778] (ftrace buffer empty) [ 27.800495] Modules linked in: [ 27.803702] CPU: 1 PID: 4509 Comm: syz-executor370 Not tainted 4.17.0-rc7+ #72 [ 27.811054] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.820419] RIP: 0010:n_tty_set_termios+0x2d9/0xe80 executing program executing program [ 27.825466] RSP: 0018:ffff8801ad41f698 EFLAGS: 00010203 [ 27.830831] RAX: 0000000000000001 RBX: 0000000000000000 RCX: 000000000000000b [ 27.838112] RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000005 [ 27.845388] RBP: ffff8801ad41f6d0 R08: ffff8801ad198540 R09: 0000000000000002 [ 27.852654] R10: ffff8801ad198dc8 R11: ffff8801ad198540 R12: ffff8801b3d93340 [ 27.859916] R13: ffff8801b3d936f4 R14: 000000000000005d R15: ffff8801ad41f730 [ 27.867180] FS: 00007fa4ffe37700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 27.875396] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.881273] CR2: 00007fa4ffdf4e78 CR3: 00000001d97ba000 CR4: 00000000001406e0 [ 27.888538] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.895811] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.903070] Call Trace: [ 27.905656] ? n_tty_receive_signal_char+0x120/0x120 [ 27.910773] tty_set_termios+0x7a0/0xac0 [ 27.914842] ? tty_wait_until_sent+0x5b0/0x5b0 [ 27.919420] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 27.924953] set_termios+0x41e/0x7d0 [ 27.928659] ? tty_perform_flush+0x80/0x80 [ 27.932897] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 27.938432] tty_mode_ioctl+0x855/0xb50 [ 27.942403] ? set_termios+0x7d0/0x7d0 [ 27.946295] ? check_same_owner+0x320/0x320 [ 27.950609] ? exit_robust_list+0x290/0x290 [ 27.954929] n_tty_ioctl_helper+0x54/0x3b0 [ 27.959153] n_tty_ioctl+0x54/0x320 [ 27.962768] ? ldsem_down_read+0x37/0x40 [ 27.966828] ? ldsem_down_read+0x37/0x40 [ 27.970884] tty_ioctl+0x5e1/0x1870 [ 27.974503] ? commit_echoes+0x1d0/0x1d0 [ 27.978556] ? tty_vhangup+0x30/0x30 [ 27.982258] ? rcu_is_watching+0x85/0x140 [ 27.986404] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 27.991613] ? __fget+0x40c/0x650 [ 27.995078] ? expand_files.part.8+0x9a0/0x9a0 [ 27.999663] ? trace_hardirqs_off+0xd/0x10 [ 28.003904] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 28.009007] ? tty_vhangup+0x30/0x30 [ 28.012716] do_vfs_ioctl+0x1cf/0x16a0 [ 28.016605] ? ioctl_preallocate+0x2e0/0x2e0 [ 28.021025] ? fget_raw+0x20/0x20 [ 28.024476] ? kmem_cache_free+0x25c/0x2d0 [ 28.028707] ? __x64_sys_futex+0x477/0x680 [ 28.032934] ? exit_to_usermode_loop+0x87/0x310 [ 28.037591] ? do_futex+0x27d0/0x27d0 [ 28.041385] ? security_file_ioctl+0x94/0xc0 [ 28.045791] ksys_ioctl+0xa9/0xd0 [ 28.049240] __x64_sys_ioctl+0x73/0xb0 [ 28.053117] do_syscall_64+0x1b1/0x800 [ 28.056992] ? syscall_return_slowpath+0x5c0/0x5c0 [ 28.061915] ? syscall_return_slowpath+0x30f/0x5c0 [ 28.066842] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 28.072208] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.077055] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 28.082234] RIP: 0033:0x445cf9 [ 28.085408] RSP: 002b:00007fa4ffe36d18 EFLAGS: 00000297 ORIG_RAX: 0000000000000010 [ 28.093110] RAX: ffffffffffffffda RBX: 00000000006dac24 RCX: 0000000000445cf9 [ 28.100369] RDX: 0000000020000040 RSI: 0000000000005402 RDI: 0000000000000027 [ 28.107629] RBP: 00000000006dac20 R08: 0000000000000000 R09: 0000000000000000 [ 28.114892] R10: 0000000000000000 R11: 0000000000000297 R12: 6d74702f7665642f executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 28.122152] R13: 00007fff9223372f R14: 00007fa4ffe379c0 R15: 0000000000000007 [ 28.129420] Code: 8b 45 d0 31 ff 83 e0 02 89 c6 89 45 d0 e8 c0 28 e1 fd 8b 45 d0 4c 89 f1 48 ba 00 00 00 00 00 fc ff df 85 c0 0f 95 c0 48 c1 e9 03 <0f> b6 14 11 4c 89 f1 83 e1 07 38 ca 7f 08 84 d2 0f 85 96 09 00 [ 28.148748] RIP: n_tty_set_termios+0x2d9/0xe80 RSP: ffff8801ad41f698 [ 28.155323] ---[ end trace 3d43070155a9a577 ]--- [ 28.160135] Kernel panic - not syncing: Fatal exception [ 28.165995] Dumping ftrace buffer: [ 28.169526] (ftrace buffer empty) [ 28.173219] Kernel Offset: disabled [ 28.176837] Rebooting in 86400 seconds..