[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.468501] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 15.461641] random: sshd: uninitialized urandom read (32 bytes read) [ 15.855296] random: sshd: uninitialized urandom read (32 bytes read) [ 16.740402] random: sshd: uninitialized urandom read (32 bytes read) [ 16.866547] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.58' (ECDSA) to the list of known hosts. [ 22.363103] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 22.439866] ------------[ cut here ]------------ [ 22.444644] WARNING: CPU: 0 PID: 3789 at lib/vsprintf.c:1941 set_precision+0x144/0x170 [ 22.452671] precision 59591 too large[ 22.456265] Kernel panic - not syncing: panic_on_warn set ... [ 22.456265] [ 22.463622] CPU: 0 PID: 3789 Comm: syz-executor221 Not tainted 4.9.107-g42a730a #48 [ 22.471389] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 22.480713] ffff8801b69176d0 ffffffff81eb42a9 ffffffff83c48b40 00000000ffffffff [ 22.488691] 0000000000000000 0000000000000000 0000000000000795 ffff8801b6917790 [ 22.496673] ffffffff81421e65 0000000041b58ab3 ffffffff843b9b50 ffffffff81421ca6 [ 22.504642] Call Trace: [ 22.507200] [] dump_stack+0xc1/0x128 [ 22.512534] [] panic+0x1bf/0x3bc [ 22.517524] [] ? add_taint.cold.6+0x16/0x16 [ 22.523463] [] ? __warn.cold.9+0xa6/0x17f [ 22.529229] [] ? set_precision+0x144/0x170 [ 22.535081] [] __warn.cold.9+0xc1/0x17f [ 22.540675] [] ? unwind_next_frame+0x86/0xe0 [ 22.546703] [] warn_slowpath_fmt+0xc2/0x100 [ 22.552648] [] ? __warn+0x50/0x50 [ 22.557721] [] ? format_decode+0x1b1/0x9e0 [ 22.563574] [] ? set_precision+0x170/0x170 [ 22.569425] [] set_precision+0x144/0x170 [ 22.575104] [] vsnprintf+0x31e/0x1840 [ 22.580520] [] ? pointer+0xb00/0xb00 [ 22.585855] [] vscnprintf+0x2d/0x60 [ 22.591102] [] vprintk_emit+0xf4/0x790 [ 22.596609] [] vprintk+0x28/0x30 [ 22.601595] [] vprintk_default+0x1d/0x30 [ 22.607276] [] printk+0xaf/0xd7 [ 22.612176] [] ? log_wakeup_reason.cold.1+0x13f/0x13f [ 22.618987] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 22.625883] [] ? ___ratelimit+0x53/0x401 [ 22.631565] [] dns_resolver_preparse.cold.3+0x71/0x240 [ 22.638459] [] ? dns_resolver_free_preparse+0x40/0x40 [ 22.645274] [] ? dns_resolver_free_preparse+0x40/0x40 [ 22.652083] [] key_create_or_update+0x35b/0xac0 [ 22.658368] [] ? key_type_lookup+0xd0/0xd0 [ 22.664222] [] ? lookup_user_key+0x10f/0xd10 [ 22.670256] [] ? __check_object_size+0x248/0x38e [ 22.676631] [] SyS_add_key+0x1b4/0x390 [ 22.682137] [] ? key_get_type_from_user.constprop.9+0xe0/0xe0 [ 22.689645] [] ? compat_SyS_setsockopt+0x2a0/0x2a0 [ 22.696197] [] ? do_fast_syscall_32+0xcf/0x870 [ 22.702397] [] ? key_get_type_from_user.constprop.9+0xe0/0xe0 [ 22.709898] [] do_fast_syscall_32+0x2f7/0x870 [ 22.716011] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 22.722658] [] entry_SYSENTER_compat+0x90/0xa2 [ 22.729313] Dumping ftrace buffer: [ 22.732826] (ftrace buffer empty) [ 22.736506] Kernel Offset: disabled [ 22.740103] Rebooting in 86400 seconds..