[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.042109] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.035907] random: sshd: uninitialized urandom read (32 bytes read) [ 25.384627] random: sshd: uninitialized urandom read (32 bytes read) [ 26.260778] random: sshd: uninitialized urandom read (32 bytes read) [ 26.420331] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.7' (ECDSA) to the list of known hosts. [ 31.914536] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 32.010117] ------------[ cut here ]------------ [ 32.010120] precision 1047878 too large [ 32.010124] WARNING: CPU: 1 PID: 4583 at lib/vsprintf.c:2164 set_precision+0xc3/0xe0 [ 32.010127] Kernel panic - not syncing: panic_on_warn set ... [ 32.010129] [ 32.010132] CPU: 1 PID: 4583 Comm: syz-executor016 Not tainted 4.18.0-rc4+ #148 [ 32.010137] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.010139] Call Trace: [ 32.010141] dump_stack+0x1c9/0x2b4 [ 32.010144] ? dump_stack_print_info.cold.2+0x52/0x52 [ 32.010146] ? format_decode+0x1b1/0xaf0 [ 32.010148] panic+0x238/0x4e7 [ 32.010150] ? add_taint.cold.5+0x16/0x16 [ 32.010152] ? __warn.cold.8+0x148/0x1ba [ 32.010155] ? __warn.cold.8+0x117/0x1ba [ 32.010157] ? set_precision+0xc3/0xe0 [ 32.010159] __warn.cold.8+0x163/0x1ba [ 32.010161] ? set_precision+0xc3/0xe0 [ 32.010163] report_bug+0x252/0x2d0 [ 32.010165] do_error_trap+0x1fc/0x4d0 [ 32.010168] ? printk_safe_log_store+0x23f/0x2f0 [ 32.010170] ? math_error+0x3e0/0x3e0 [ 32.010172] ? printk_deferred+0xdd/0xdd [ 32.010174] ? vprintk_func+0xd0/0xe7 [ 32.010176] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 32.010179] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.010181] do_invalid_op+0x1b/0x20 [ 32.010183] invalid_op+0x14/0x20 [ 32.010185] RIP: 0010:set_precision+0xc3/0xe0 [ 32.010186] Code: fc ff df 80 3c 02 00 75 32 66 41 89 5d 06 eb 9d e8 c2 d0 eb f9 89 de 48 c7 c7 20 76 86 88 c6 05 3e 8c 09 02 01 e8 fd f3 b6 f9 <0f> 0b eb a7 4c 89 ef e8 61 b0 29 fa e9 5a ff ff ff 4c 89 ef e8 54 [ 32.010264] RSP: 0018:ffff8801ac04f6d8 EFLAGS: 00010086 [ 32.010269] RAX: 0000000000000000 RBX: 00000000000ffd46 RCX: 0000000000000000 [ 32.010272] RDX: 0000000000000000 RSI: ffffffff81631870 RDI: 0000000000000001 [ 32.010275] RBP: ffff8801ac04f6f0 R08: ffff8801ac682740 R09: ffffed003b5e42cd [ 32.010279] R10: ffffed003b5e42cd R11: ffff8801daf2166f R12: 0000000000000000 [ 32.010282] R13: ffff8801ac04f768 R14: ffffffff888445ae R15: ffff8801ac04f7a8 [ 32.010284] ? vprintk_func+0xd0/0xe7 [ 32.010286] ? set_precision+0xc3/0xe0 [ 32.010288] vsnprintf+0x38b/0x1b60 [ 32.010290] ? pointer+0x950/0x950 [ 32.010292] vscnprintf+0x2d/0x80 [ 32.010294] vprintk_emit+0x1ab/0xdf0 [ 32.010297] ? wake_up_klogd+0x110/0x110 [ 32.010299] ? lock_downgrade+0x8f0/0x8f0 [ 32.010301] ? mark_held_locks+0xc9/0x160 [ 32.010304] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 32.010306] vprintk_default+0x28/0x30 [ 32.010308] vprintk_func+0x7a/0xe7 [ 32.010310] printk+0xa7/0xcf [ 32.010312] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 32.010315] dns_resolver_preparse.cold.3+0x1fd/0x252 [ 32.010317] ? dns_resolver_free_preparse+0x40/0x40 [ 32.010320] ? security_key_permission+0x94/0xc0 [ 32.010322] ? dns_resolver_free_preparse+0x40/0x40 [ 32.010325] key_create_or_update+0x583/0x1120 [ 32.010327] ? key_type_lookup+0xd0/0xd0 [ 32.010329] ? join_session_keyring+0x340/0x340 [ 32.010332] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.010335] __x64_sys_add_key+0x3cf/0x4e0 [ 32.010337] ? key_get_type_from_user.constprop.7+0x110/0x110 [ 32.010340] ? do_syscall_64+0x9a/0x820 [ 32.010342] do_syscall_64+0x1b9/0x820 [ 32.010344] ? syscall_return_slowpath+0x5e0/0x5e0 [ 32.010347] ? syscall_return_slowpath+0x31d/0x5e0 [ 32.010349] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 32.010352] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.010355] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 32.010357] RIP: 0033:0x440099 [ 32.010358] 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 [ 32.010435] RSP: 002b:00007ffc76319808 EFLAGS: 00000286 ORIG_RAX: 00000000000000f8 [ 32.010441] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440099 [ 32.010445] RDX: 00000000200000c0 RSI: 0000000020000000 RDI: 0000000020000080 [ 32.010448] RBP: 00000000006ca018 R08: 00000000fffffffb R09: 00000000004002c8 [ 32.010452] R10: 00000000000fffff R11: 0000000000000286 R12: 0000000000401920 [ 32.010455] R13: 00000000004019b0 R14: 0000000000000000 R15: 0000000000000000 [ 32.010457] Dumping ftrace buffer: [ 32.010459] (ftrace buffer empty) [ 32.010461] Kernel Offset: disabled