[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.007900] 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: [ 21.970944] random: sshd: uninitialized urandom read (32 bytes read) [ 22.313980] random: sshd: uninitialized urandom read (32 bytes read) [ 23.277047] random: sshd: uninitialized urandom read (32 bytes read) [ 23.414323] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.49' (ECDSA) to the list of known hosts. [ 28.896450] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 28.985353] ------------[ cut here ]------------ [ 28.990174] WARNING: CPU: 1 PID: 3716 at lib/vsprintf.c:1941 set_precision+0x144/0x170 [ 28.998202] precision 59591 too large[ 29.001805] Kernel panic - not syncing: panic_on_warn set ... [ 29.001805] [ 29.009173] CPU: 1 PID: 3716 Comm: syz-executor987 Not tainted 4.9.107-g42a730a #48 [ 29.016951] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.026285] ffff8801c3ba76d0 ffffffff81eb42a9 ffffffff83c48b40 00000000ffffffff [ 29.034315] 0000000000000000 0000000000000001 0000000000000795 ffff8801c3ba7790 [ 29.042318] ffffffff81421e65 0000000041b58ab3 ffffffff843b9b50 ffffffff81421ca6 [ 29.050324] Call Trace: [ 29.052895] [] dump_stack+0xc1/0x128 [ 29.058233] [] panic+0x1bf/0x3bc [ 29.063234] [] ? add_taint.cold.6+0x16/0x16 [ 29.069188] [] ? __warn.cold.9+0xa6/0x17f [ 29.074961] [] ? set_precision+0x144/0x170 [ 29.080819] [] __warn.cold.9+0xc1/0x17f [ 29.086419] [] ? unwind_next_frame+0x86/0xe0 [ 29.092453] [] warn_slowpath_fmt+0xc2/0x100 [ 29.098411] [] ? __warn+0x50/0x50 [ 29.103487] [] ? format_decode+0x1b1/0x9e0 [ 29.109355] [] ? set_precision+0x170/0x170 [ 29.115225] [] set_precision+0x144/0x170 [ 29.120909] [] vsnprintf+0x31e/0x1840 [ 29.126331] [] ? pointer+0xb00/0xb00 [ 29.131679] [] vscnprintf+0x2d/0x60 [ 29.136933] [] vprintk_emit+0xf4/0x790 [ 29.142444] [] vprintk+0x28/0x30 [ 29.147434] [] vprintk_default+0x1d/0x30 [ 29.153130] [] printk+0xaf/0xd7 [ 29.158034] [] ? log_wakeup_reason.cold.1+0x13f/0x13f [ 29.164849] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 29.171748] [] ? ___ratelimit+0x53/0x401 [ 29.177433] [] dns_resolver_preparse.cold.3+0x71/0x240 [ 29.184336] [] ? dns_resolver_free_preparse+0x40/0x40 [ 29.191149] [] ? dns_resolver_free_preparse+0x40/0x40 [ 29.197964] [] key_create_or_update+0x35b/0xac0 [ 29.204258] [] ? key_type_lookup+0xd0/0xd0 [ 29.210116] [] ? lookup_user_key+0x10f/0xd10 [ 29.216153] [] ? __check_object_size+0x248/0x38e [ 29.222542] [] SyS_add_key+0x1b4/0x390 [ 29.228054] [] ? key_get_type_from_user.constprop.9+0xe0/0xe0 [ 29.235575] [] ? compat_SyS_setsockopt+0x2a0/0x2a0 [ 29.242156] [] ? do_fast_syscall_32+0xcf/0x870 [ 29.248375] [] ? key_get_type_from_user.constprop.9+0xe0/0xe0 [ 29.256500] [] do_fast_syscall_32+0x2f7/0x870 [ 29.262647] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.269289] [] entry_SYSENTER_compat+0x90/0xa2 [ 29.276011] Dumping ftrace buffer: [ 29.279528] (ftrace buffer empty) [ 29.283221] Kernel Offset: disabled [ 29.286825] Rebooting in 86400 seconds..