[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.817624] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 12.969373] random: sshd: uninitialized urandom read (32 bytes read) [ 13.179572] random: sshd: uninitialized urandom read (32 bytes read) [ 13.943250] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.180481] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.6' (ECDSA) to the list of known hosts. [ 31.644796] 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 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 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 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 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 [ 32.214116] ================================================================== [ 32.221501] BUG: KASAN: user-memory-access in n_tty_set_termios+0xf6/0xd30 [ 32.228496] Write of size 512 at addr 0000000000001060 by task syz-executor970/3813 [ 32.236258] [ 32.237859] CPU: 1 PID: 3813 Comm: syz-executor970 Not tainted 4.9.96-g71fce1e #10 [ 32.245538] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.254865] ffff8801d94c7708 ffffffff81eb0b69 0000000000001060 0000000000000200 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 [ 32.263446] 0000000000000001 000000000000005d ffff8801d94c7848 ffff8801d94c7750 [ 32.271506] ffffffff81565640 ffffffff8211b4f6 0000000000000286 c8781b594e4e9e9e [ 32.279746] Call Trace: [ 32.282308] [] dump_stack+0xc1/0x128 [ 32.287645] [] kasan_report.cold.6+0x6d/0x2fe [ 32.293761] [] ? n_tty_set_termios+0xf6/0xd30 [ 32.299880] [] check_memory_region+0x14f/0x1b0 [ 32.306083] [] memset+0x23/0x40 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 [ 32.310984] [] n_tty_set_termios+0xf6/0xd30 [ 32.316929] [] ? n_tty_receive_signal_char+0xf0/0xf0 [ 32.323652] [] tty_set_termios+0x626/0x8a0 [ 32.329509] [] ? tty_wait_until_sent+0x4d0/0x4d0 [ 32.335904] [] ? ldsem_up_read+0x3a/0x70 [ 32.341586] [] set_termios+0x38f/0x620 [ 32.347108] [] ? tty_perform_flush+0x80/0x80 [ 32.353142] [] tty_mode_ioctl+0x8c2/0x980 [ 32.358919] [] ? set_termios+0x620/0x620 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 [ 32.364603] [] ? __ldsem_down_read_nested+0xce/0x4f0 [ 32.371329] [] ? ldsem_down_read+0x32/0x40 [ 32.377184] [] ? futex_lock_pi_atomic+0x2b0/0x2b0 [ 32.383647] [] ? ldsem_wake+0x40/0x40 [ 32.389068] [] n_tty_ioctl_helper+0x44/0x370 [ 32.395095] [] n_tty_ioctl+0x46/0x2c0 [ 32.400517] [] ? ldsem_down_read+0x32/0x40 [ 32.406372] [] tty_ioctl+0x5a4/0x2270 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 [ 32.411800] [] ? commit_echoes+0x1b0/0x1b0 [ 32.417652] [] ? no_tty+0xa0/0xa0 [ 32.422727] [] ? avc_ss_reset+0x110/0x110 [ 32.428498] [] ? __lock_acquire+0x654/0x4070 [ 32.434543] [] ? exit_robust_list+0x220/0x220 [ 32.440667] [] ? __might_sleep+0x95/0x1a0 [ 32.446436] [] ? no_tty+0xa0/0xa0 [ 32.451509] [] do_vfs_ioctl+0x1ac/0x11a0 [ 32.457189] [] ? ioctl_preallocate+0x220/0x220 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 [ 32.463393] [] ? selinux_capable+0x40/0x40 [ 32.469248] [] ? __fget+0x20a/0x3b0 [ 32.474498] [] ? __fget+0x231/0x3b0 [ 32.479747] [] ? __fget+0x47/0x3b0 [ 32.484910] [] ? security_file_ioctl+0x8f/0xc0 [ 32.491117] [] SyS_ioctl+0x8f/0xc0 [ 32.496278] [] ? do_vfs_ioctl+0x11a0/0x11a0 [ 32.502226] [] do_syscall_64+0x1a6/0x490 [ 32.507910] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb 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 [ 32.514806] ================================================================== [ 32.522137] Disabling lock debugging due to kernel taint [ 32.531703] Kernel panic - not syncing: panic_on_warn set ... [ 32.531703] [ 32.539068] CPU: 0 PID: 3813 Comm: syz-executor970 Tainted: G B 4.9.96-g71fce1e #10 [ 32.547963] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.557290] ffff8801d94c7630 ffffffff81eb0b69 ffffffff841c492d 00000000ffffffff [ 32.565287] 0000000000000000 0000000000000000 ffff8801d94c7848 ffff8801d94c76f0 [ 32.573272] ffffffff8141f975 0000000041b58ab3 ffffffff841b8030 ffffffff8141f7b6 [ 32.581251] Call Trace: [ 32.583817] [] dump_stack+0xc1/0x128 [ 32.589168] [] panic+0x1bf/0x3bc [ 32.594163] [] ? add_taint.cold.6+0x16/0x16 [ 32.600466] [] ? ___preempt_schedule+0x16/0x18 [ 32.606681] [] kasan_end_report+0x47/0x4f [ 32.612461] [] kasan_report.cold.6+0x76/0x2fe [ 32.618593] [] ? n_tty_set_termios+0xf6/0xd30 [ 32.624718] [] check_memory_region+0x14f/0x1b0 [ 32.630929] [] memset+0x23/0x40 [ 32.635923] [] n_tty_set_termios+0xf6/0xd30 [ 32.641873] [] ? n_tty_receive_signal_char+0xf0/0xf0 [ 32.648609] [] tty_set_termios+0x626/0x8a0 [ 32.654484] [] ? tty_wait_until_sent+0x4d0/0x4d0 executing program [ 32.660874] [] ? ldsem_up_read+0x3a/0x70 [ 32.666567] [] set_termios+0x38f/0x620 [ 32.672087] [] ? tty_perform_flush+0x80/0x80 [ 32.678119] [] tty_mode_ioctl+0x8c2/0x980 [ 32.683893] [] ? set_termios+0x620/0x620 [ 32.689586] [] ? __ldsem_down_read_nested+0xce/0x4f0 [ 32.696324] [] ? ldsem_down_read+0x32/0x40 [ 32.702188] [] ? futex_lock_pi_atomic+0x2b0/0x2b0 [ 32.708662] [] ? ldsem_wake+0x40/0x40 [ 32.714098] [] n_tty_ioctl_helper+0x44/0x370 [ 32.720133] [] n_tty_ioctl+0x46/0x2c0 [ 32.725571] [] ? ldsem_down_read+0x32/0x40 [ 32.731440] [] tty_ioctl+0x5a4/0x2270 [ 32.736874] [] ? commit_echoes+0x1b0/0x1b0 [ 32.742736] [] ? no_tty+0xa0/0xa0 [ 32.747817] [] ? avc_ss_reset+0x110/0x110 [ 32.753599] [] ? __lock_acquire+0x654/0x4070 [ 32.759647] [] ? exit_robust_list+0x220/0x220 [ 32.765776] [] ? __might_sleep+0x95/0x1a0 [ 32.771572] [] ? no_tty+0xa0/0xa0 [ 32.776665] [] do_vfs_ioctl+0x1ac/0x11a0 [ 32.782363] [] ? ioctl_preallocate+0x220/0x220 [ 32.788588] [] ? selinux_capable+0x40/0x40 [ 32.794462] [] ? __fget+0x20a/0x3b0 [ 32.799726] [] ? __fget+0x231/0x3b0 [ 32.804989] [] ? __fget+0x47/0x3b0 [ 32.810173] [] ? security_file_ioctl+0x8f/0xc0 [ 32.816385] [] SyS_ioctl+0x8f/0xc0 [ 32.821561] [] ? do_vfs_ioctl+0x11a0/0x11a0 [ 32.827526] [] do_syscall_64+0x1a6/0x490 [ 32.833357] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 32.840636] Dumping ftrace buffer: [ 32.844163] (ftrace buffer empty) [ 32.847856] Kernel Offset: disabled [ 32.851467] Rebooting in 86400 seconds..