[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 35.412509] kauditd_printk_skb: 10 callbacks suppressed [ 35.412521] audit: type=1400 audit(1541847947.088:35): avc: denied { map } for pid=5742 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Warning: Permanently added '10.128.0.33' (ECDSA) to the list of known hosts. executing program [ 41.999518] audit: type=1400 audit(1541847953.678:36): avc: denied { map } for pid=5756 comm="syz-executor313" path="/root/syz-executor313041540" dev="sda1" ino=16483 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 42.003166] [ 42.025927] audit: type=1400 audit(1541847953.678:37): avc: denied { prog_load } for pid=5756 comm="syz-executor313" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=bpf permissive=1 [ 42.027598] ********************************************************** [ 42.027604] ** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE ** [ 42.027609] ** ** [ 42.027619] ** trace_printk() being used. Allocating extra memory. ** [ 42.077039] ** ** [ 42.083721] ** This means that this is a DEBUG kernel and it is ** [ 42.090393] ** unsafe for production use. ** [ 42.097039] ** ** [ 42.103712] ** If you see this message and you are not debugging ** [ 42.110393] ** the kernel, report this immediately to your vendor! ** [ 42.117038] ** ** [ 42.123742] ** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE ** [ 42.130625] ********************************************************** [ 42.145668] audit: type=1400 audit(1541847953.818:38): avc: denied { prog_run } for pid=5756 comm="syz-executor313" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=bpf permissive=1 [ 42.145760] ------------[ cut here ]------------ [ 42.173008] Please remove unsupported % in format string [ 42.178984] WARNING: CPU: 1 PID: 5756 at lib/vsprintf.c:2152 format_decode+0x8fc/0xaf0 [ 42.187028] Kernel panic - not syncing: panic_on_warn set ... [ 42.192907] CPU: 1 PID: 5756 Comm: syz-executor313 Not tainted 4.20.0-rc1+ #108 [ 42.200332] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.209663] Call Trace: [ 42.212232] dump_stack+0x244/0x39d [ 42.215841] ? dump_stack_print_info.cold.1+0x20/0x20 [ 42.221032] panic+0x2ad/0x55c [ 42.224214] ? add_taint.cold.5+0x16/0x16 [ 42.228347] ? __warn.cold.8+0x5/0x45 [ 42.232128] ? __warn+0xe8/0x1d0 [ 42.235473] ? format_decode+0x8fc/0xaf0 [ 42.239514] __warn.cold.8+0x20/0x45 [ 42.243210] ? rcu_softirq_qs+0x20/0x20 [ 42.247166] ? format_decode+0x8fc/0xaf0 [ 42.251208] report_bug+0x254/0x2d0 [ 42.254818] do_error_trap+0x11b/0x200 [ 42.258688] do_invalid_op+0x36/0x40 [ 42.262383] ? format_decode+0x8fc/0xaf0 [ 42.266423] invalid_op+0x14/0x20 [ 42.269859] RIP: 0010:format_decode+0x8fc/0xaf0 [ 42.274509] Code: e8 19 39 b5 f9 41 c6 45 00 12 e9 9b fd ff ff e8 0a 39 b5 f9 0f be f3 48 c7 c7 c0 f1 d5 88 c6 05 22 0a 47 02 01 e8 c4 9a 7e f9 <0f> 0b 4d 8b 66 c0 e9 59 fe ff ff 48 8b bd 70 ff ff ff e8 bd 85 f8 [ 42.293389] RSP: 0018:ffff8801c3e07670 EFLAGS: 00010286 [ 42.298735] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 42.305984] RDX: 0000000000000000 RSI: ffffffff8165e9b5 RDI: 0000000000000005 [ 42.313238] RBP: ffff8801c3e07718 R08: ffff8801c4a8a4c0 R09: ffffed003b5e5020 [ 42.320486] R10: ffffed003b5e5020 R11: ffff8801daf28107 R12: ffff8801c3e07aec [ 42.327847] R13: ffff8801c3e07790 R14: ffff8801c3e076f0 R15: 0000000000000000 [ 42.335110] ? vprintk_func+0x85/0x181 [ 42.338984] ? enable_ptr_key_workfn+0x30/0x30 [ 42.343546] ? trace_hardirqs_off_caller+0x310/0x310 [ 42.348634] vsnprintf+0x185/0x1b60 [ 42.352248] ? pointer+0x900/0x900 [ 42.355774] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 42.361294] ? check_preemption_disabled+0x48/0x280 [ 42.366293] vscnprintf+0x2d/0x80 [ 42.369727] __trace_array_vprintk.part.59+0x5b/0x2f0 [ 42.374895] ? trace_hardirqs_off_caller+0x310/0x310 [ 42.379982] trace_vprintk+0x71/0x90 [ 42.383676] __trace_printk+0xce/0x120 [ 42.387543] ? __trace_bprintk+0x120/0x120 [ 42.391763] ? bpf_test_run+0x175/0x780 [ 42.395722] ? lock_downgrade+0x900/0x900 [ 42.399867] bpf_trace_printk+0xb30/0xc50 [ 42.403996] ? bpf_test_run+0x22b/0x780 [ 42.407961] ? bpf_probe_read_str+0x60/0x60 [ 42.412263] ? bpf_test_run+0x3cb/0x780 [ 42.416217] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 42.421734] ? check_preemption_disabled+0x48/0x280 [ 42.426736] ? kasan_check_read+0x11/0x20 [ 42.430868] ? rcu_dynticks_curr_cpu_in_eqs+0xa2/0x170 [ 42.436125] ? rcu_softirq_qs+0x20/0x20 [ 42.440080] ? bpf_cgroup_storage_release+0x220/0x220 [ 42.445353] bpf_prog_12183cdb1cd51dab+0x366/0x1000 [ 42.450351] ? bpf_test_run+0x25d/0x780 [ 42.454311] ? netlink_diag_dump+0x2a0/0x2a0 [ 42.458703] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 42.464221] ? bpf_test_init.isra.10+0x70/0x100 [ 42.468879] ? bpf_prog_test_run_skb+0x73b/0xcb0 [ 42.473620] ? bpf_test_finish.isra.9+0x1f0/0x1f0 [ 42.478457] ? bpf_prog_add+0x69/0xd0 [ 42.482241] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 42.487764] ? __bpf_prog_get+0x9b/0x290 [ 42.491809] ? bpf_test_finish.isra.9+0x1f0/0x1f0 [ 42.496633] ? bpf_prog_test_run+0x130/0x1a0 [ 42.501028] ? __x64_sys_bpf+0x3d8/0x520 [ 42.505067] ? bpf_prog_get+0x20/0x20 [ 42.508854] ? do_syscall_64+0x1b9/0x820 [ 42.512898] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 42.518241] ? syscall_return_slowpath+0x5e0/0x5e0 [ 42.523161] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 42.528092] ? trace_hardirqs_on_caller+0x310/0x310 [ 42.533120] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 42.538219] ? prepare_exit_to_usermode+0x291/0x3b0 [ 42.543220] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 42.548048] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 42.554871] Kernel Offset: disabled [ 42.558544] Rebooting in 86400 seconds..