[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.421680] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.493363] random: sshd: uninitialized urandom read (32 bytes read) [ 20.839045] random: sshd: uninitialized urandom read (32 bytes read) [ 21.797030] random: sshd: uninitialized urandom read (32 bytes read) [ 21.922777] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.29' (ECDSA) to the list of known hosts. [ 27.406577] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 27.498900] ------------[ cut here ]------------ [ 27.503690] WARNING: CPU: 1 PID: 3778 at lib/vsprintf.c:1938 set_precision+0x144/0x170 [ 27.511717] precision 1048186 too large[ 27.515498] Kernel panic - not syncing: panic_on_warn set ... [ 27.515498] [ 27.522857] CPU: 1 PID: 3778 Comm: syz-executor213 Not tainted 4.9.113-g47bbcd6 #14 [ 27.530631] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.540748] ffff8801d94976d0 ffffffff81eb32a9 ffffffff83c48980 00000000ffffffff [ 27.548752] 0000000000000000 0000000000000001 0000000000000792 ffff8801d9497790 [ 27.556757] ffffffff81421a55 0000000041b58ab3 ffffffff843bb788 ffffffff81421896 [ 27.564779] Call Trace: [ 27.567348] [] dump_stack+0xc1/0x128 [ 27.573136] [] panic+0x1bf/0x3bc [ 27.578138] [] ? add_taint.cold.6+0x16/0x16 [ 27.584097] [] ? __warn.cold.9+0xa6/0x17f [ 27.589890] [] ? set_precision+0x144/0x170 [ 27.595755] [] __warn.cold.9+0xc1/0x17f [ 27.601368] [] ? unwind_next_frame+0x86/0xe0 [ 27.607419] [] warn_slowpath_fmt+0xc2/0x100 [ 27.613400] [] ? __warn+0x50/0x50 [ 27.618496] [] ? format_decode+0x1b1/0x9e0 [ 27.624378] [] ? set_precision+0x170/0x170 [ 27.630259] [] set_precision+0x144/0x170 [ 27.635954] [] vsnprintf+0x31e/0x1840 [ 27.641387] [] ? pointer+0xb00/0xb00 [ 27.646731] [] vscnprintf+0x2d/0x60 [ 27.651991] [] vprintk_emit+0xf4/0x790 [ 27.657513] [] vprintk+0x28/0x30 [ 27.662509] [] vprintk_default+0x1d/0x30 [ 27.668198] [] printk+0xaf/0xd7 [ 27.673100] [] ? log_wakeup_reason.cold.1+0x13f/0x13f [ 27.679937] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 27.686846] [] ? ___ratelimit+0x53/0x401 [ 27.692536] [] dns_resolver_preparse.cold.3+0x71/0x240 [ 27.699438] [] ? dns_resolver_free_preparse+0x40/0x40 [ 27.706260] [] ? dns_resolver_free_preparse+0x40/0x40 [ 27.713086] [] key_create_or_update+0x35b/0xac0 [ 27.719403] [] ? key_type_lookup+0xd0/0xd0 [ 27.725269] [] ? lookup_user_key+0x10f/0xd10 [ 27.731306] [] ? __check_object_size+0x248/0x38e [ 27.737686] [] SyS_add_key+0x1b4/0x390 [ 27.743206] [] ? key_get_type_from_user.constprop.9+0xe0/0xe0 [ 27.750717] [] ? __do_page_fault+0x183/0xd50 [ 27.756756] [] ? do_fast_syscall_32+0xcf/0x870 [ 27.763072] [] ? key_get_type_from_user.constprop.9+0xe0/0xe0 [ 27.770586] [] do_fast_syscall_32+0x2f7/0x870 [ 27.776711] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.783352] [] entry_SYSENTER_compat+0x90/0xa2 [ 27.790230] Dumping ftrace buffer: [ 27.793751] (ftrace buffer empty) [ 27.797433] Kernel Offset: disabled [ 27.801035] Rebooting in 86400 seconds..