[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.835061] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.054226] random: sshd: uninitialized urandom read (32 bytes read) [ 19.288834] random: sshd: uninitialized urandom read (32 bytes read) [ 19.975529] random: sshd: uninitialized urandom read (32 bytes read) [ 20.120097] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.38' (ECDSA) to the list of known hosts. [ 25.557291] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 25.648583] ------------[ cut here ]------------ [ 25.653362] WARNING: CPU: 0 PID: 3794 at lib/vsprintf.c:1941 set_precision+0x144/0x170 [ 25.661393] precision 1037366 too large[ 25.665169] Kernel panic - not syncing: panic_on_warn set ... [ 25.665169] [ 25.672525] CPU: 0 PID: 3794 Comm: syz-executor733 Not tainted 4.9.96-g320d53a #10 [ 25.680203] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.689534] ffff8801d997f6e0 ffffffff81eb0b69 ffffffff83a484a0 00000000ffffffff [ 25.697544] 0000000000000000 0000000000000000 0000000000000795 ffff8801d997f7a0 [ 25.705708] ffffffff8141f975 0000000041b58ab3 ffffffff841b8030 ffffffff8141f7b6 [ 25.713698] Call Trace: [ 25.716263] [] dump_stack+0xc1/0x128 [ 25.721604] [] panic+0x1bf/0x3bc [ 25.726599] [] ? add_taint.cold.6+0x16/0x16 [ 25.732544] [] ? __warn.cold.9+0xa6/0x17f [ 25.738325] [] ? set_precision+0x144/0x170 [ 25.744184] [] __warn.cold.9+0xc1/0x17f [ 25.749787] [] warn_slowpath_fmt+0xc2/0x100 [ 25.755728] [] ? __warn+0x50/0x50 [ 25.760802] [] ? security_key_permission+0x83/0xc0 [ 25.767360] [] ? format_decode+0x1b1/0x9e0 [ 25.773240] [] ? set_precision+0x170/0x170 [ 25.779106] [] set_precision+0x144/0x170 [ 25.784795] [] vsnprintf+0x31e/0x1840 [ 25.790304] [] ? pointer+0xb00/0xb00 [ 25.795641] [] ? RECLAIM_FS_verbose+0x10/0x10 [ 25.801757] [] ? mark_lock+0x7a3/0x1280 [ 25.807366] [] vscnprintf+0x2d/0x60 [ 25.812617] [] vprintk_emit+0xf4/0x790 [ 25.818125] [] vprintk+0x28/0x30 [ 25.823216] [] vprintk_default+0x1d/0x30 [ 25.829593] [] printk+0xaf/0xd7 [ 25.834494] [] ? log_wakeup_reason.cold.1+0x13f/0x13f [ 25.841325] [] ? debug_check_no_locks_freed+0x210/0x210 [ 25.848313] [] dns_resolver_preparse.cold.3+0x9d/0x23b [ 25.855215] [] ? dns_resolver_free_preparse+0x40/0x40 [ 25.862033] [] ? dns_resolver_free_preparse+0x40/0x40 [ 25.868846] [] key_create_or_update+0x35b/0xac0 [ 25.875138] [] ? key_type_lookup+0xd0/0xd0 [ 25.881000] [] ? lookup_user_key+0x10f/0xd10 [ 25.887032] [] ? lookup_user_key+0xa0b/0xd10 [ 25.893067] [] ? __check_object_size+0x248/0x38e [ 25.899450] [] SyS_add_key+0x1b4/0x390 [ 25.904961] [] ? key_get_type_from_user.constprop.9+0xe0/0xe0 [ 25.912472] [] ? do_syscall_64+0x48/0x490 [ 25.918244] [] ? key_get_type_from_user.constprop.9+0xe0/0xe0 [ 25.925769] [] do_syscall_64+0x1a6/0x490 [ 25.931462] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 25.938412] Dumping ftrace buffer: [ 25.941928] (ftrace buffer empty) [ 25.945614] Kernel Offset: disabled [ 25.949215] Rebooting in 86400 seconds..