[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.152892] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.078457] random: sshd: uninitialized urandom read (32 bytes read) [ 19.452663] random: sshd: uninitialized urandom read (32 bytes read) [ 20.332124] random: sshd: uninitialized urandom read (32 bytes read) [ 20.472979] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.15.208' (ECDSA) to the list of known hosts. [ 25.914050] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 25.992477] ------------[ cut here ]------------ [ 25.997252] WARNING: CPU: 0 PID: 3800 at lib/vsprintf.c:1938 set_precision+0x144/0x170 [ 26.005274] precision 1047814 too large[ 26.009041] Kernel panic - not syncing: panic_on_warn set ... [ 26.009041] [ 26.016391] CPU: 0 PID: 3800 Comm: syz-executor440 Not tainted 4.9.113-g47bbcd6 #10 [ 26.024152] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.033477] ffff8801d97376e0 ffffffff81eb32a9 ffffffff83c48980 00000000ffffffff [ 26.041454] 0000000000000000 0000000000000000 0000000000000792 ffff8801d97377a0 [ 26.049446] ffffffff81421a55 0000000041b58ab3 ffffffff843bb788 ffffffff81421896 [ 26.057419] Call Trace: [ 26.059979] [] dump_stack+0xc1/0x128 [ 26.065312] [] panic+0x1bf/0x3bc [ 26.070300] [] ? add_taint.cold.6+0x16/0x16 [ 26.076246] [] ? __warn.cold.9+0xa6/0x17f [ 26.082020] [] ? set_precision+0x144/0x170 [ 26.087873] [] __warn.cold.9+0xc1/0x17f [ 26.093469] [] ? unwind_next_frame+0x86/0xe0 [ 26.099497] [] warn_slowpath_fmt+0xc2/0x100 [ 26.105439] [] ? __warn+0x50/0x50 [ 26.110511] [] ? format_decode+0x1b1/0x9e0 [ 26.116367] [] ? set_precision+0x170/0x170 [ 26.122220] [] set_precision+0x144/0x170 [ 26.127901] [] vsnprintf+0x31e/0x1840 [ 26.133321] [] ? pointer+0xb00/0xb00 [ 26.138660] [] vscnprintf+0x2d/0x60 [ 26.143907] [] vprintk_emit+0xf4/0x790 [ 26.149415] [] vprintk+0x28/0x30 [ 26.154402] [] vprintk_default+0x1d/0x30 [ 26.160079] [] printk+0xaf/0xd7 [ 26.164976] [] ? log_wakeup_reason.cold.1+0x13f/0x13f [ 26.171787] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 26.178683] [] ? ___ratelimit+0x53/0x401 [ 26.184364] [] dns_resolver_preparse.cold.3+0x71/0x240 [ 26.191258] [] ? dns_resolver_free_preparse+0x40/0x40 [ 26.198064] [] ? dns_resolver_free_preparse+0x40/0x40 [ 26.204875] [] key_create_or_update+0x35b/0xac0 [ 26.211162] [] ? key_type_lookup+0xd0/0xd0 [ 26.217031] [] ? lookup_user_key+0x10f/0xd10 [ 26.223076] [] ? __check_object_size+0x248/0x38e [ 26.229450] [] SyS_add_key+0x1b4/0x390 [ 26.234956] [] ? key_get_type_from_user.constprop.9+0xe0/0xe0 [ 26.242460] [] ? do_syscall_64+0x48/0x490 [ 26.248314] [] ? key_get_type_from_user.constprop.9+0xe0/0xe0 [ 26.255817] [] do_syscall_64+0x1a6/0x490 [ 26.261496] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 26.268822] Dumping ftrace buffer: [ 26.272334] (ftrace buffer empty) [ 26.276014] Kernel Offset: disabled [ 26.279610] Rebooting in 86400 seconds..