[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.497376] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.946422] random: sshd: uninitialized urandom read (32 bytes read) [ 23.353483] random: sshd: uninitialized urandom read (32 bytes read) [ 24.176669] random: sshd: uninitialized urandom read (32 bytes read) [ 24.325431] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.7' (ECDSA) to the list of known hosts. [ 29.793385] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.883293] ------------[ cut here ]------------ [ 29.883296] precision 59591 too large [ 29.883301] WARNING: CPU: 0 PID: 4563 at lib/vsprintf.c:2164 set_precision+0xc3/0xe0 [ 29.883304] Kernel panic - not syncing: panic_on_warn set ... [ 29.883305] [ 29.883309] CPU: 0 PID: 4563 Comm: syz-executor254 Not tainted 4.17.0+ #115 [ 29.883313] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.883315] Call Trace: [ 29.883317] dump_stack+0x1b9/0x294 [ 29.883320] ? dump_stack_print_info.cold.2+0x52/0x52 [ 29.883322] ? set_precision+0xb0/0xe0 [ 29.883324] panic+0x22f/0x4de [ 29.883327] ? add_taint.cold.5+0x16/0x16 [ 29.883329] ? __warn.cold.8+0x148/0x1b3 [ 29.883331] ? __warn.cold.8+0x117/0x1b3 [ 29.883333] ? set_precision+0xc3/0xe0 [ 29.883335] __warn.cold.8+0x163/0x1b3 [ 29.883337] ? set_precision+0xc3/0xe0 [ 29.883340] report_bug+0x252/0x2d0 [ 29.883342] do_error_trap+0x1fc/0x4d0 [ 29.883344] ? printk_safe_log_store+0x237/0x2d0 [ 29.883346] ? math_error+0x3f0/0x3f0 [ 29.883348] ? printk_deferred+0xc6/0xc6 [ 29.883351] ? vprintk_func+0xd0/0xe7 [ 29.883353] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 29.883356] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.883358] do_invalid_op+0x1b/0x20 [ 29.883360] invalid_op+0x14/0x20 [ 29.883362] RIP: 0010:set_precision+0xc3/0xe0 [ 29.883363] Code: fc ff df 80 3c 02 00 75 32 66 41 89 5d 06 eb 9d e8 62 c9 fb f9 89 de 48 c7 c7 40 5c 86 88 c6 05 49 a1 1a 02 01 e8 ad e0 c7 f9 <0f> 0b eb a7 4c 89 ef e8 51 bd 38 fa e9 5a ff ff ff 4c 89 ef e8 44 [ 29.883443] RSP: 0018:ffff8801ac8df688 EFLAGS: 00010082 [ 29.883447] RAX: 0000000000000019 RBX: 000000000000e8c7 RCX: ffffffff81854ea8 [ 29.883451] RDX: 0000000000000000 RSI: ffffffff8161f530 RDI: 0000000000000001 [ 29.883454] RBP: ffff8801ac8df6a0 R08: ffff8801d8f30700 R09: ffffed003b5c42cd [ 29.883458] R10: ffffed003b5c42cd R11: ffff8801dae2166f R12: 0000000000000000 [ 29.883461] R13: ffff8801ac8df718 R14: ffffffff8884212e R15: ffff8801ac8df758 [ 29.883463] ? irq_work_queue+0x28/0x130 [ 29.883465] ? vprintk_func+0xd0/0xe7 [ 29.883467] ? set_precision+0xc3/0xe0 [ 29.883469] vsnprintf+0x3b3/0x1b40 [ 29.883471] ? pointer+0x930/0x930 [ 29.883474] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.883477] ? search_nested_keyrings+0x608/0x11d0 [ 29.883479] ? kasan_check_write+0x14/0x20 [ 29.883481] vscnprintf+0x2d/0x80 [ 29.883483] vprintk_emit+0x1a3/0xde0 [ 29.883485] ? wake_up_klogd+0x100/0x100 [ 29.883488] ? lock_downgrade+0x8e0/0x8e0 [ 29.883490] ? mark_held_locks+0xc9/0x160 [ 29.883492] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 29.883494] vprintk_default+0x28/0x30 [ 29.883496] vprintk_func+0x7a/0xe7 [ 29.883498] printk+0x9e/0xba [ 29.883501] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 29.883503] dns_resolver_preparse.cold.3+0x71/0x252 [ 29.883506] ? dns_resolver_free_preparse+0x40/0x40 [ 29.883509] ? security_key_permission+0x94/0xc0 [ 29.883511] ? dns_resolver_free_preparse+0x40/0x40 [ 29.883514] key_create_or_update+0x569/0x1100 [ 29.883516] ? key_type_lookup+0xd0/0xd0 [ 29.883518] ? join_session_keyring+0x340/0x340 [ 29.883521] ? lock_release+0xa10/0xa10 [ 29.883523] ? check_same_owner+0x320/0x320 [ 29.883526] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 29.883528] ? __check_object_size+0x95/0x5d9 [ 29.883531] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 29.883533] ? _copy_from_user+0xdf/0x150 [ 29.883535] __ia32_sys_add_key+0x3d6/0x4e0 [ 29.883538] ? __x64_sys_add_key+0x4e0/0x4e0 [ 29.883540] ? mm_fault_error+0x380/0x380 [ 29.883542] ? do_fast_syscall_32+0x148/0xf9b [ 29.883545] do_fast_syscall_32+0x345/0xf9b [ 29.883547] ? do_int80_syscall_32+0x880/0x880 [ 29.883549] ? do_syscall_64+0x48f/0x800 [ 29.883552] ? syscall_return_slowpath+0x5c0/0x5c0 [ 29.883554] ? syscall_return_slowpath+0x30f/0x5c0 [ 29.883557] ? sysret32_from_system_call+0x5/0x46 [ 29.883559] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.883562] entry_SYSENTER_compat+0x70/0x7f [ 29.883564] RIP: 0023:0xf7ffacb9 [ 29.883565] 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 [ 29.883644] RSP: 002b:00000000ffb0528c EFLAGS: 00000286 ORIG_RAX: 000000000000011e [ 29.883649] RAX: ffffffffffffffda RBX: 0000000020000100 RCX: 0000000020000080 [ 29.883653] RDX: 0000000020002200 RSI: 000000000000e9da RDI: 000000003259876d [ 29.883657] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 29.883660] R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000 [ 29.883664] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 29.883666] Dumping ftrace buffer: [ 29.883668] (ftrace buffer empty) [ 29.883670] Kernel Offset: disabled