[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.724844] 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: [ 20.977366] random: sshd: uninitialized urandom read (32 bytes read) [ 21.541746] random: sshd: uninitialized urandom read (32 bytes read) [ 22.342317] random: sshd: uninitialized urandom read (32 bytes read) [ 22.468053] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.39' (ECDSA) to the list of known hosts. [ 27.926574] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 28.006148] ------------[ cut here ]------------ [ 28.010934] WARNING: CPU: 0 PID: 3807 at lib/vsprintf.c:1941 set_precision+0x144/0x170 [ 28.018960] precision 1037366 too large[ 28.022729] Kernel panic - not syncing: panic_on_warn set ... [ 28.022729] [ 28.030082] CPU: 0 PID: 3807 Comm: syz-executor770 Not tainted 4.9.96-g320d53a #10 [ 28.037758] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.047085] ffff8801c326f6d0 ffffffff81eb0b69 ffffffff83a484a0 00000000ffffffff [ 28.055067] 0000000000000000 0000000000000000 0000000000000795 ffff8801c326f790 [ 28.063047] ffffffff8141f975 0000000041b58ab3 ffffffff841b8030 ffffffff8141f7b6 [ 28.071034] Call Trace: [ 28.073592] [] dump_stack+0xc1/0x128 [ 28.078932] [] panic+0x1bf/0x3bc [ 28.083922] [] ? add_taint.cold.6+0x16/0x16 [ 28.089865] [] ? __warn.cold.9+0xa6/0x17f [ 28.095633] [] ? set_precision+0x144/0x170 [ 28.101491] [] __warn.cold.9+0xc1/0x17f [ 28.107086] [] warn_slowpath_fmt+0xc2/0x100 [ 28.113033] [] ? __warn+0x50/0x50 [ 28.118110] [] ? security_key_permission+0x83/0xc0 [ 28.124660] [] ? format_decode+0x1b1/0x9e0 [ 28.130515] [] ? set_precision+0x170/0x170 [ 28.136367] [] set_precision+0x144/0x170 [ 28.142047] [] vsnprintf+0x31e/0x1840 [ 28.147468] [] ? pointer+0xb00/0xb00 [ 28.152801] [] ? RECLAIM_FS_verbose+0x10/0x10 [ 28.158917] [] ? mark_lock+0x7a3/0x1280 [ 28.164519] [] vscnprintf+0x2d/0x60 [ 28.169775] [] vprintk_emit+0xf4/0x790 [ 28.175281] [] vprintk+0x28/0x30 [ 28.180275] [] vprintk_default+0x1d/0x30 [ 28.185957] [] printk+0xaf/0xd7 [ 28.190858] [] ? log_wakeup_reason.cold.1+0x13f/0x13f [ 28.197682] [] ? debug_check_no_locks_freed+0x210/0x210 [ 28.204669] [] dns_resolver_preparse.cold.3+0x9d/0x23b [ 28.211565] [] ? dns_resolver_free_preparse+0x40/0x40 [ 28.218372] [] ? dns_resolver_free_preparse+0x40/0x40 [ 28.225185] [] key_create_or_update+0x35b/0xac0 [ 28.231471] [] ? key_type_lookup+0xd0/0xd0 [ 28.237327] [] ? lookup_user_key+0x10f/0xd10 [ 28.243354] [] ? lookup_user_key+0xa0b/0xd10 [ 28.249383] [] ? __check_object_size+0x248/0x38e [ 28.255757] [] SyS_add_key+0x1b4/0x390 [ 28.261264] [] ? key_get_type_from_user.constprop.9+0xe0/0xe0 [ 28.268770] [] ? do_fast_syscall_32+0xcf/0x870 [ 28.274979] [] ? key_get_type_from_user.constprop.9+0xe0/0xe0 [ 28.282483] [] do_fast_syscall_32+0x2f7/0x870 [ 28.288596] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.295231] [] entry_SYSENTER_compat+0x90/0xa2 [ 28.301909] Dumping ftrace buffer: [ 28.305423] (ftrace buffer empty) [ 28.309105] Kernel Offset: disabled [ 28.312702] Rebooting in 86400 seconds..