[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.071614] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.882771] random: sshd: uninitialized urandom read (32 bytes read) [ 22.248605] random: sshd: uninitialized urandom read (32 bytes read) [ 23.088745] random: sshd: uninitialized urandom read (32 bytes read) [ 31.455576] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.19' (ECDSA) to the list of known hosts. [ 36.898652] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 36.989862] ------------[ cut here ]------------ [ 36.989865] precision 59591 too large [ 36.989870] WARNING: CPU: 0 PID: 4485 at lib/vsprintf.c:2164 set_precision+0xc3/0xe0 [ 36.989873] Kernel panic - not syncing: panic_on_warn set ... [ 36.989875] [ 36.989878] CPU: 0 PID: 4485 Comm: syz-executor291 Not tainted 4.17.0+ #92 [ 36.989883] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.989884] Call Trace: [ 36.989887] dump_stack+0x1b9/0x294 [ 36.989889] ? dump_stack_print_info.cold.2+0x52/0x52 [ 36.989891] ? set_precision+0xb0/0xe0 [ 36.989893] panic+0x22f/0x4de [ 36.989895] ? add_taint.cold.5+0x16/0x16 [ 36.989898] ? __warn.cold.8+0x148/0x1b3 [ 36.989900] ? __warn.cold.8+0x117/0x1b3 [ 36.989902] ? set_precision+0xc3/0xe0 [ 36.989905] __warn.cold.8+0x163/0x1b3 [ 36.989907] ? set_precision+0xc3/0xe0 [ 36.989909] report_bug+0x252/0x2d0 [ 36.989911] do_error_trap+0x1fc/0x4d0 [ 36.989913] ? printk_safe_log_store+0x237/0x2d0 [ 36.989916] ? math_error+0x3f0/0x3f0 [ 36.989918] ? printk_deferred+0xc6/0xc6 [ 36.989920] ? vprintk_func+0xd0/0xe7 [ 36.989922] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 36.989925] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 36.989927] do_invalid_op+0x1b/0x20 [ 36.989929] invalid_op+0x14/0x20 [ 36.989931] RIP: 0010:set_precision+0xc3/0xe0 [ 36.989933] Code: fc ff df 80 3c 02 00 75 32 66 41 89 5d 06 eb 9d e8 62 89 fb f9 89 de 48 c7 c7 40 63 86 88 c6 05 ca 65 1a 02 01 e8 ad a0 c7 f9 <0f> 0b eb a7 4c 89 ef e8 61 7d 38 fa e9 5a ff ff ff 4c 89 ef e8 54 [ 36.990012] RSP: 0018:ffff8801b3eef6d8 EFLAGS: 00010086 [ 36.990017] RAX: 0000000000000019 RBX: 000000000000e8c7 RCX: ffffffff81854ea8 [ 36.990021] RDX: 0000000000000000 RSI: ffffffff8161f530 RDI: 0000000000000001 [ 36.990024] RBP: ffff8801b3eef6f0 R08: ffff8801b4632000 R09: ffffed003b5c42cd [ 36.990027] R10: ffffed003b5c42cd R11: ffff8801dae2166f R12: 0000000000000000 [ 36.990031] R13: ffff8801b3eef768 R14: ffffffff8884282e R15: ffff8801b3eef7a8 [ 36.990033] ? irq_work_queue+0x28/0x130 [ 36.990035] ? vprintk_func+0xd0/0xe7 [ 36.990037] ? set_precision+0xc3/0xe0 [ 36.990039] vsnprintf+0x3b3/0x1b40 [ 36.990041] ? pointer+0x930/0x930 [ 36.990044] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.990047] ? search_nested_keyrings+0x608/0x11d0 [ 36.990049] ? kasan_check_write+0x14/0x20 [ 36.990051] vscnprintf+0x2d/0x80 [ 36.990053] vprintk_emit+0x1a3/0xde0 [ 36.990055] ? wake_up_klogd+0x100/0x100 [ 36.990058] ? lock_downgrade+0x8e0/0x8e0 [ 36.990060] ? mark_held_locks+0xc9/0x160 [ 36.990062] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 36.990064] vprintk_default+0x28/0x30 [ 36.990066] vprintk_func+0x7a/0xe7 [ 36.990068] printk+0x9e/0xba [ 36.990071] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 36.990073] dns_resolver_preparse.cold.3+0x71/0x252 [ 36.990076] ? dns_resolver_free_preparse+0x40/0x40 [ 36.990078] ? security_key_permission+0x94/0xc0 [ 36.990081] ? dns_resolver_free_preparse+0x40/0x40 [ 36.990084] key_create_or_update+0x569/0x1100 [ 36.990086] ? key_type_lookup+0xd0/0xd0 [ 36.990088] ? join_session_keyring+0x340/0x340 [ 36.990091] ? lock_release+0xa10/0xa10 [ 36.990093] ? check_same_owner+0x320/0x320 [ 36.990095] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 36.990098] ? __check_object_size+0x95/0x5d9 [ 36.990101] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 36.990103] ? _copy_from_user+0xdf/0x150 [ 36.990105] __x64_sys_add_key+0x3cf/0x4e0 [ 36.990108] ? key_get_type_from_user.constprop.7+0x110/0x110 [ 36.990110] ? do_syscall_64+0x92/0x800 [ 36.990113] do_syscall_64+0x1b1/0x800 [ 36.990115] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 36.990118] ? syscall_return_slowpath+0x5c0/0x5c0 [ 36.990120] ? syscall_return_slowpath+0x30f/0x5c0 [ 36.990123] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 36.990126] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 36.990128] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 36.990130] RIP: 0033:0x43fdb9 [ 36.990131] 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 6b 45 00 00 c3 66 2e 0f 1f 84 00 00 00 00 [ 36.990210] RSP: 002b:00007ffeeab619a8 EFLAGS: 00000286 ORIG_RAX: 00000000000000f8 [ 36.990216] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fdb9 [ 36.990219] RDX: 0000000020002200 RSI: 0000000020000080 RDI: 0000000020000100 [ 36.990223] RBP: 00000000006ca018 R08: 00000000131ba422 R09: 00000000004002c8 [ 36.990226] R10: 000000000000e9da R11: 0000000000000286 R12: 00000000004016e0 [ 36.990230] R13: 0000000000401770 R14: 0000000000000000 R15: 0000000000000000 [ 36.990232] Dumping ftrace buffer: [ 36.990234] (ftrace buffer empty) [ 36.990236] Kernel Offset: disabled