[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.611537] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.455704] random: sshd: uninitialized urandom read (32 bytes read) [ 18.931892] random: sshd: uninitialized urandom read (32 bytes read) [ 19.776968] random: sshd: uninitialized urandom read (32 bytes read) [ 19.935839] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.3' (ECDSA) to the list of known hosts. [ 25.343956] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 25.441964] ------------[ cut here ]------------ [ 25.446769] WARNING: CPU: 0 PID: 3802 at lib/vsprintf.c:1941 set_precision+0x144/0x170 [ 25.454797] precision 59591 too large[ 25.458398] Kernel panic - not syncing: panic_on_warn set ... [ 25.458398] [ 25.465757] CPU: 0 PID: 3802 Comm: syz-executor685 Not tainted 4.9.107-g42a730a #48 [ 25.473539] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.482870] ffff8801b67976e0 ffffffff81eb42a9 ffffffff83c48b40 00000000ffffffff [ 25.490855] 0000000000000000 0000000000000000 0000000000000795 ffff8801b67977a0 [ 25.498860] ffffffff81421e65 0000000041b58ab3 ffffffff843b9b50 ffffffff81421ca6 [ 25.506866] Call Trace: [ 25.509430] [] dump_stack+0xc1/0x128 [ 25.514805] [] panic+0x1bf/0x3bc [ 25.519824] [] ? add_taint.cold.6+0x16/0x16 [ 25.525787] [] ? __warn.cold.9+0xa6/0x17f [ 25.531568] [] ? set_precision+0x144/0x170 [ 25.537427] [] __warn.cold.9+0xc1/0x17f [ 25.543044] [] ? unwind_next_frame+0x86/0xe0 [ 25.549092] [] warn_slowpath_fmt+0xc2/0x100 [ 25.555034] [] ? __warn+0x50/0x50 [ 25.560128] [] ? format_decode+0x1b1/0x9e0 [ 25.565987] [] ? set_precision+0x170/0x170 [ 25.571858] [] set_precision+0x144/0x170 [ 25.577544] [] vsnprintf+0x31e/0x1840 [ 25.582969] [] ? pointer+0xb00/0xb00 [ 25.588304] [] vscnprintf+0x2d/0x60 [ 25.593560] [] vprintk_emit+0xf4/0x790 [ 25.599084] [] vprintk+0x28/0x30 [ 25.604073] [] vprintk_default+0x1d/0x30 [ 25.609758] [] printk+0xaf/0xd7 [ 25.614660] [] ? log_wakeup_reason.cold.1+0x13f/0x13f [ 25.621502] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 25.628410] [] ? ___ratelimit+0x53/0x401 [ 25.634099] [] dns_resolver_preparse.cold.3+0x71/0x240 [ 25.641016] [] ? dns_resolver_free_preparse+0x40/0x40 [ 25.647829] [] ? dns_resolver_free_preparse+0x40/0x40 [ 25.654660] [] key_create_or_update+0x35b/0xac0 [ 25.660962] [] ? key_type_lookup+0xd0/0xd0 [ 25.666833] [] ? lookup_user_key+0x10f/0xd10 [ 25.672868] [] ? __check_object_size+0x248/0x38e [ 25.679257] [] SyS_add_key+0x1b4/0x390 [ 25.684777] [] ? key_get_type_from_user.constprop.9+0xe0/0xe0 [ 25.692289] [] ? do_syscall_64+0x48/0x490 [ 25.698157] [] ? key_get_type_from_user.constprop.9+0xe0/0xe0 [ 25.705663] [] do_syscall_64+0x1a6/0x490 [ 25.711350] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 25.718826] Dumping ftrace buffer: [ 25.722366] (ftrace buffer empty) [ 25.726052] Kernel Offset: disabled [ 25.729653] Rebooting in 86400 seconds..