[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.753771] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.798784] random: sshd: uninitialized urandom read (32 bytes read) [ 24.068170] random: sshd: uninitialized urandom read (32 bytes read) [ 24.842170] random: sshd: uninitialized urandom read (32 bytes read) [ 53.330916] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.22' (ECDSA) to the list of known hosts. [ 58.769830] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 58.871305] ------------[ cut here ]------------ [ 58.871308] precision 59591 too large [ 58.871313] WARNING: CPU: 0 PID: 4509 at lib/vsprintf.c:2164 set_precision+0xc3/0xe0 [ 58.871316] Kernel panic - not syncing: panic_on_warn set ... [ 58.871317] [ 58.871321] CPU: 0 PID: 4509 Comm: syz-executor854 Not tainted 4.17.0+ #116 [ 58.871326] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 58.871328] Call Trace: [ 58.871330] dump_stack+0x1b9/0x294 [ 58.871333] ? dump_stack_print_info.cold.2+0x52/0x52 [ 58.871335] ? set_precision+0xb0/0xe0 [ 58.871337] panic+0x22f/0x4de [ 58.871339] ? add_taint.cold.5+0x16/0x16 [ 58.871341] ? __warn.cold.8+0x148/0x1b3 [ 58.871343] ? __warn.cold.8+0x117/0x1b3 [ 58.871346] ? set_precision+0xc3/0xe0 [ 58.871348] __warn.cold.8+0x163/0x1b3 [ 58.871350] ? set_precision+0xc3/0xe0 [ 58.871352] report_bug+0x252/0x2d0 [ 58.871354] do_error_trap+0x1fc/0x4d0 [ 58.871357] ? printk_safe_log_store+0x237/0x2d0 [ 58.871360] ? math_error+0x3f0/0x3f0 [ 58.871363] ? printk_deferred+0xc6/0xc6 [ 58.871366] ? vprintk_func+0xd0/0xe7 [ 58.871369] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 58.871371] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 58.871373] do_invalid_op+0x1b/0x20 [ 58.871375] invalid_op+0x14/0x20 [ 58.871378] RIP: 0010:set_precision+0xc3/0xe0 [ 58.871379] Code: fc ff df 80 3c 02 00 75 32 66 41 89 5d 06 eb 9d e8 62 a9 fb f9 89 de 48 c7 c7 40 63 86 88 c6 05 4a 84 1a 02 01 e8 ad c0 c7 f9 <0f> 0b eb a7 4c 89 ef e8 61 9d 38 fa e9 5a ff ff ff 4c 89 ef e8 54 [ 58.871462] RSP: 0018:ffff8801af887688 EFLAGS: 00010082 [ 58.871467] RAX: 0000000000000019 RBX: 000000000000e8c7 RCX: ffffffff81854ea8 [ 58.871471] RDX: 0000000000000000 RSI: ffffffff8161f530 RDI: 0000000000000001 [ 58.871474] RBP: ffff8801af8876a0 R08: ffff8801af854440 R09: ffffed003b5c42cd [ 58.871478] R10: ffffed003b5c42cd R11: ffff8801dae2166f R12: 0000000000000000 [ 58.871481] R13: ffff8801af887718 R14: ffffffff8884282e R15: ffff8801af887758 [ 58.871483] ? irq_work_queue+0x28/0x130 [ 58.871486] ? vprintk_func+0xd0/0xe7 [ 58.871488] ? set_precision+0xc3/0xe0 [ 58.871490] vsnprintf+0x3b3/0x1b40 [ 58.871492] ? pointer+0x930/0x930 [ 58.871495] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 58.871498] ? search_nested_keyrings+0x608/0x11d0 [ 58.871500] ? kasan_check_write+0x14/0x20 [ 58.871502] vscnprintf+0x2d/0x80 [ 58.871504] vprintk_emit+0x1a3/0xde0 [ 58.871507] ? wake_up_klogd+0x100/0x100 [ 58.871509] ? lock_downgrade+0x8e0/0x8e0 [ 58.871512] ? mark_held_locks+0xc9/0x160 [ 58.871514] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 58.871516] vprintk_default+0x28/0x30 [ 58.871518] vprintk_func+0x7a/0xe7 [ 58.871520] printk+0x9e/0xba [ 58.871522] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 58.871525] dns_resolver_preparse.cold.3+0x71/0x252 [ 58.871528] ? dns_resolver_free_preparse+0x40/0x40 [ 58.871530] ? security_key_permission+0x94/0xc0 [ 58.871533] ? dns_resolver_free_preparse+0x40/0x40 [ 58.871535] key_create_or_update+0x569/0x1100 [ 58.871538] ? key_type_lookup+0xd0/0xd0 [ 58.871540] ? join_session_keyring+0x340/0x340 [ 58.871543] ? lock_release+0xa10/0xa10 [ 58.871545] ? check_same_owner+0x320/0x320 [ 58.871547] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 58.871550] ? __check_object_size+0x95/0x5d9 [ 58.871553] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 58.871555] ? _copy_from_user+0xdf/0x150 [ 58.871558] __ia32_sys_add_key+0x3d6/0x4e0 [ 58.871560] ? __x64_sys_add_key+0x4e0/0x4e0 [ 58.871562] ? mm_fault_error+0x380/0x380 [ 58.871565] ? do_fast_syscall_32+0x148/0xf9b [ 58.871567] do_fast_syscall_32+0x345/0xf9b [ 58.871570] ? do_int80_syscall_32+0x880/0x880 [ 58.871572] ? do_syscall_64+0x48f/0x800 [ 58.871574] ? syscall_return_slowpath+0x5c0/0x5c0 [ 58.871577] ? syscall_return_slowpath+0x30f/0x5c0 [ 58.871580] ? sysret32_from_system_call+0x5/0x46 [ 58.871582] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 58.871584] entry_SYSENTER_compat+0x70/0x7f [ 58.871586] RIP: 0023:0xf7f0fcb9 [ 58.871588] 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 [ 58.871666] RSP: 002b:00000000ffde274c EFLAGS: 00000282 ORIG_RAX: 000000000000011e [ 58.871672] RAX: ffffffffffffffda RBX: 0000000020000100 RCX: 0000000020000080 [ 58.871675] RDX: 0000000020002200 RSI: 000000000000e9da RDI: 000000003c42e753 [ 58.871679] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 58.871682] R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000 [ 58.871686] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 58.871688] Dumping ftrace buffer: [ 58.871690] (ftrace buffer empty) [ 58.871692] Kernel Offset: disabled