[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.842701] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.869698] random: sshd: uninitialized urandom read (32 bytes read) [ 24.334878] random: sshd: uninitialized urandom read (32 bytes read) [ 25.182822] random: sshd: uninitialized urandom read (32 bytes read) [ 25.334656] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.37' (ECDSA) to the list of known hosts. [ 30.816713] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 30.919745] ------------[ cut here ]------------ [ 30.919750] precision 1047878 too large [ 30.919757] WARNING: CPU: 0 PID: 4552 at lib/vsprintf.c:2164 set_precision+0xc3/0xe0 [ 30.919762] Kernel panic - not syncing: panic_on_warn set ... [ 30.919764] [ 30.919770] CPU: 0 PID: 4552 Comm: syz-executor808 Not tainted 4.18.0-rc4+ #47 [ 30.919777] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.919780] Call Trace: [ 30.919784] dump_stack+0x1c9/0x2b4 [ 30.919788] ? dump_stack_print_info.cold.2+0x52/0x52 [ 30.919792] ? format_decode+0x1b1/0xaf0 [ 30.919796] panic+0x238/0x4e7 [ 30.919800] ? add_taint.cold.5+0x16/0x16 [ 30.919804] ? __warn.cold.8+0x148/0x1ba [ 30.919808] ? __warn.cold.8+0x117/0x1ba [ 30.919812] ? set_precision+0xc3/0xe0 [ 30.919816] __warn.cold.8+0x163/0x1ba [ 30.919819] ? set_precision+0xc3/0xe0 [ 30.919823] report_bug+0x252/0x2d0 [ 30.919826] do_error_trap+0x1fc/0x4d0 [ 30.919831] ? printk_safe_log_store+0x23f/0x2f0 [ 30.919834] ? math_error+0x3e0/0x3e0 [ 30.919838] ? printk_deferred+0xdd/0xdd [ 30.919842] ? vprintk_func+0xd0/0xe7 [ 30.919846] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 30.919851] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.919854] do_invalid_op+0x1b/0x20 [ 30.919858] invalid_op+0x14/0x20 [ 30.919862] RIP: 0010:set_precision+0xc3/0xe0 [ 30.919865] 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 [ 30.920009] RSP: 0018:ffff8801ce7ef688 EFLAGS: 00010082 [ 30.920016] RAX: 0000000000000000 RBX: 00000000000ffd46 RCX: 0000000000000000 [ 30.920021] RDX: 0000000000000000 RSI: ffffffff81631870 RDI: 0000000000000001 [ 30.920030] RBP: ffff8801ce7ef6a0 R08: ffff8801d8c680c0 R09: ffffed003b5c42cd [ 30.920036] R10: ffffed003b5c42cd R11: ffff8801dae2166f R12: 0000000000000000 [ 30.920042] R13: ffff8801ce7ef718 R14: ffffffff8884412e R15: ffff8801ce7ef758 [ 30.920046] ? vprintk_func+0xd0/0xe7 [ 30.920049] ? set_precision+0xc3/0xe0 [ 30.920053] vsnprintf+0x38b/0x1b60 [ 30.920057] ? pointer+0x950/0x950 [ 30.920060] vscnprintf+0x2d/0x80 [ 30.920064] vprintk_emit+0x1ab/0xdf0 [ 30.920068] ? wake_up_klogd+0x110/0x110 [ 30.920072] ? lock_downgrade+0x8f0/0x8f0 [ 30.920076] ? mark_held_locks+0xc9/0x160 [ 30.920080] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 30.920084] vprintk_default+0x28/0x30 [ 30.920087] vprintk_func+0x7a/0xe7 [ 30.920091] printk+0xa7/0xcf [ 30.920095] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 30.920100] dns_resolver_preparse.cold.3+0x1fd/0x252 [ 30.920104] ? dns_resolver_free_preparse+0x40/0x40 [ 30.920109] ? security_key_permission+0x94/0xc0 [ 30.920113] ? dns_resolver_free_preparse+0x40/0x40 [ 30.920118] key_create_or_update+0x583/0x1120 [ 30.920121] ? key_type_lookup+0xd0/0xd0 [ 30.920126] ? join_session_keyring+0x340/0x340 [ 30.920131] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 30.920135] __ia32_sys_add_key+0x3d6/0x4e0 [ 30.920139] ? __x64_sys_add_key+0x4e0/0x4e0 [ 30.920143] ? do_fast_syscall_32+0x150/0xfb2 [ 30.920147] do_fast_syscall_32+0x34d/0xfb2 [ 30.920151] ? do_int80_syscall_32+0x890/0x890 [ 30.920155] ? do_syscall_64+0x497/0x820 [ 30.920160] ? syscall_return_slowpath+0x5e0/0x5e0 [ 30.920164] ? syscall_return_slowpath+0x31d/0x5e0 [ 30.920169] ? sysret32_from_system_call+0x5/0x46 [ 30.920173] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.920176] entry_SYSENTER_compat+0x70/0x7f [ 30.920179] RIP: 0023:0xf7ff5cb9 [ 30.920181] Code: 55 08 8b 88 64 cd ff ff 8b 98 68 cd ff ff 89 c8 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 1c 24 c3 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 [ 30.920327] RSP: 002b:00000000ff972dbc EFLAGS: 00000282 ORIG_RAX: 000000000000011e [ 30.920337] RAX: ffffffffffffffda RBX: 0000000020000080 RCX: 0000000020000000 [ 30.920342] RDX: 00000000200000c0 RSI: 00000000000fffff RDI: 00000000fffffffb [ 30.920348] RBP: 0000000000000012 R08: 0000000000000000 R09: 0000000000000000 [ 30.920354] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 30.920359] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 30.920363] Dumping ftrace buffer: [ 30.920367] (ftrace buffer empty) [ 30.920370] Kernel Offset: disabled