[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.125355] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.576327] random: sshd: uninitialized urandom read (32 bytes read) [ 22.979845] random: sshd: uninitialized urandom read (32 bytes read) [ 23.871633] random: sshd: uninitialized urandom read (32 bytes read) [ 30.963942] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.55' (ECDSA) to the list of known hosts. [ 36.454787] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 36.546626] ------------[ cut here ]------------ [ 36.546629] precision 1047878 too large [ 36.546633] WARNING: CPU: 1 PID: 4510 at lib/vsprintf.c:2164 set_precision+0xc3/0xe0 [ 36.546636] Kernel panic - not syncing: panic_on_warn set ... [ 36.546637] [ 36.546641] CPU: 1 PID: 4510 Comm: syz-executor597 Not tainted 4.18.0-rc4+ #144 [ 36.546645] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.546647] Call Trace: [ 36.546649] dump_stack+0x1c9/0x2b4 [ 36.546652] ? dump_stack_print_info.cold.2+0x52/0x52 [ 36.546654] ? format_decode+0x1b1/0xaf0 [ 36.546656] panic+0x238/0x4e7 [ 36.546658] ? add_taint.cold.5+0x16/0x16 [ 36.546661] ? __warn.cold.8+0x148/0x1ba [ 36.546663] ? __warn.cold.8+0x117/0x1ba [ 36.546665] ? set_precision+0xc3/0xe0 [ 36.546667] __warn.cold.8+0x163/0x1ba [ 36.546669] ? set_precision+0xc3/0xe0 [ 36.546671] report_bug+0x252/0x2d0 [ 36.546673] do_error_trap+0x1fc/0x4d0 [ 36.546676] ? printk_safe_log_store+0x23f/0x2f0 [ 36.546678] ? math_error+0x3e0/0x3e0 [ 36.546680] ? printk_deferred+0xdd/0xdd [ 36.546682] ? vprintk_func+0xd0/0xe7 [ 36.546685] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 36.546687] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 36.546689] do_invalid_op+0x1b/0x20 [ 36.546691] invalid_op+0x14/0x20 [ 36.546694] RIP: 0010:set_precision+0xc3/0xe0 [ 36.546695] Code: fc ff df 80 3c 02 00 75 32 66 41 89 5d 06 eb 9d e8 c2 e1 eb f9 89 de 48 c7 c7 a0 71 86 88 c6 05 df 9b 09 02 01 e8 9d 04 b7 f9 <0f> 0b eb a7 4c 89 ef e8 91 bc 29 fa e9 5a ff ff ff 4c 89 ef e8 84 [ 36.546773] RSP: 0018:ffff8801b6caf6d8 EFLAGS: 00010086 [ 36.546778] RAX: 0000000000000000 RBX: 00000000000ffd46 RCX: 0000000000000000 [ 36.546782] RDX: 0000000000000000 RSI: ffffffff81631870 RDI: 0000000000000001 [ 36.546785] RBP: ffff8801b6caf6f0 R08: ffff8801b0754680 R09: ffffed003b5e42cd [ 36.546788] R10: ffffed003b5e42cd R11: ffff8801daf2166f R12: 0000000000000000 [ 36.546792] R13: ffff8801b6caf768 R14: ffffffff8884412e R15: ffff8801b6caf7a8 [ 36.546794] ? vprintk_func+0xd0/0xe7 [ 36.546796] ? set_precision+0xc3/0xe0 [ 36.546798] vsnprintf+0x38b/0x1b60 [ 36.546800] ? pointer+0x950/0x950 [ 36.546802] vscnprintf+0x2d/0x80 [ 36.546804] vprintk_emit+0x1ab/0xdf0 [ 36.546807] ? wake_up_klogd+0x110/0x110 [ 36.546809] ? retint_kernel+0x10/0x10 [ 36.546811] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 36.546814] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 36.546816] ? retint_kernel+0x10/0x10 [ 36.546818] vprintk_default+0x28/0x30 [ 36.546820] vprintk_func+0x7a/0xe7 [ 36.546822] printk+0xa7/0xcf [ 36.546825] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 36.546827] dns_resolver_preparse.cold.3+0x1fd/0x252 [ 36.546830] ? dns_resolver_free_preparse+0x40/0x40 [ 36.546832] ? security_key_permission+0x94/0xc0 [ 36.546835] ? dns_resolver_free_preparse+0x40/0x40 [ 36.546837] key_create_or_update+0x583/0x1120 [ 36.546839] ? key_type_lookup+0xd0/0xd0 [ 36.546842] ? join_session_keyring+0x340/0x340 [ 36.546845] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 36.546847] __x64_sys_add_key+0x3cf/0x4e0 [ 36.546850] ? key_get_type_from_user.constprop.7+0x110/0x110 [ 36.546852] ? do_syscall_64+0x9a/0x820 [ 36.546854] do_syscall_64+0x1b9/0x820 [ 36.546857] ? syscall_return_slowpath+0x5e0/0x5e0 [ 36.546859] ? syscall_return_slowpath+0x31d/0x5e0 [ 36.546862] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 36.546865] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 36.546867] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 36.546869] RIP: 0033:0x440099 [ 36.546870] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 36.546948] RSP: 002b:00007ffddbc35648 EFLAGS: 00000286 ORIG_RAX: 00000000000000f8 [ 36.546954] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440099 [ 36.546958] RDX: 00000000200000c0 RSI: 0000000020000000 RDI: 0000000020000080 [ 36.546961] RBP: 00000000006ca018 R08: 00000000fffffffb R09: 00000000004002c8 [ 36.546964] R10: 00000000000fffff R11: 0000000000000286 R12: 0000000000401920 [ 36.546968] R13: 00000000004019b0 R14: 0000000000000000 R15: 0000000000000000 [ 36.546970] Dumping ftrace buffer: [ 36.546972] (ftrace buffer empty) [ 36.546974] Kernel Offset: disabled