[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.184392] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 16.085250] random: sshd: uninitialized urandom read (32 bytes read) [ 16.254731] random: sshd: uninitialized urandom read (32 bytes read) [ 17.275020] random: sshd: uninitialized urandom read (32 bytes read) [ 17.406397] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.8' (ECDSA) to the list of known hosts. [ 22.789685] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 22.873410] ------------[ cut here ]------------ [ 22.878198] WARNING: CPU: 1 PID: 3792 at lib/vsprintf.c:1941 set_precision+0x144/0x170 [ 22.886225] precision 59591 too large[ 22.889822] Kernel panic - not syncing: panic_on_warn set ... [ 22.889822] [ 22.897177] CPU: 1 PID: 3792 Comm: syz-executor963 Not tainted 4.9.107-g42a730a #45 [ 22.904942] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 22.914650] ffff8801c0dcf6e0 ffffffff81eb42a9 ffffffff83c48b40 00000000ffffffff [ 22.922676] 0000000000000000 0000000000000001 0000000000000795 ffff8801c0dcf7a0 [ 22.930673] ffffffff81421e65 0000000041b58ab3 ffffffff843b9b50 ffffffff81421ca6 [ 22.938659] Call Trace: [ 22.941227] [] dump_stack+0xc1/0x128 [ 22.946584] [] panic+0x1bf/0x3bc [ 22.951585] [] ? add_taint.cold.6+0x16/0x16 [ 22.957532] [] ? __warn.cold.9+0xa6/0x17f [ 22.963303] [] ? set_precision+0x144/0x170 [ 22.969169] [] __warn.cold.9+0xc1/0x17f [ 22.974764] [] ? unwind_next_frame+0x86/0xe0 [ 22.980794] [] warn_slowpath_fmt+0xc2/0x100 [ 22.986736] [] ? __warn+0x50/0x50 [ 22.991809] [] ? format_decode+0x1b1/0x9e0 [ 22.997667] [] ? set_precision+0x170/0x170 [ 23.003524] [] set_precision+0x144/0x170 [ 23.009205] [] vsnprintf+0x31e/0x1840 [ 23.014626] [] ? pointer+0xb00/0xb00 [ 23.019970] [] vscnprintf+0x2d/0x60 [ 23.025220] [] vprintk_emit+0xf4/0x790 [ 23.030729] [] vprintk+0x28/0x30 [ 23.035725] [] vprintk_default+0x1d/0x30 [ 23.041408] [] printk+0xaf/0xd7 [ 23.046317] [] ? log_wakeup_reason.cold.1+0x13f/0x13f [ 23.053145] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 23.060047] [] ? ___ratelimit+0x53/0x401 [ 23.065734] [] dns_resolver_preparse.cold.3+0x71/0x240 [ 23.072642] [] ? dns_resolver_free_preparse+0x40/0x40 [ 23.079457] [] ? dns_resolver_free_preparse+0x40/0x40 [ 23.086270] [] key_create_or_update+0x35b/0xac0 [ 23.092562] [] ? key_type_lookup+0xd0/0xd0 [ 23.098423] [] ? lookup_user_key+0x10f/0xd10 [ 23.104468] [] ? __check_object_size+0x248/0x38e [ 23.110845] [] SyS_add_key+0x1b4/0x390 [ 23.116364] [] ? key_get_type_from_user.constprop.9+0xe0/0xe0 [ 23.123873] [] ? do_syscall_64+0x48/0x490 [ 23.129650] [] ? key_get_type_from_user.constprop.9+0xe0/0xe0 [ 23.137160] [] do_syscall_64+0x1a6/0x490 [ 23.142847] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 23.150187] Dumping ftrace buffer: [ 23.153699] (ftrace buffer empty) [ 23.157390] Kernel Offset: disabled [ 23.160995] Rebooting in 86400 seconds..