[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 29.674074] kauditd_printk_skb: 7 callbacks suppressed [ 29.674088] audit: type=1800 audit(1543344927.229:29): pid=5898 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 29.699896] audit: type=1800 audit(1543344927.229:30): pid=5898 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.75' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 38.193223] [ 38.194987] ==================================== [ 38.199719] WARNING: syz-executor167/6053 still has locks held! [ 38.205801] 4.20.0-rc4+ #131 Not tainted [ 38.209867] ------------------------------------ [ 38.214681] 1 lock held by syz-executor167/6053: [ 38.219426] #0: 00000000bd9447c2 (&sig->cred_guard_mutex){+.+.}, at: prepare_bprm_creds+0x53/0x120 [ 38.228635] [ 38.228635] stack backtrace: [ 38.233167] CPU: 1 PID: 6053 Comm: syz-executor167 Not tainted 4.20.0-rc4+ #131 [ 38.240609] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.249940] Call Trace: [ 38.252539] dump_stack+0x244/0x39d [ 38.256185] ? dump_stack_print_info.cold.1+0x20/0x20 [ 38.261358] ? vprintk_func+0x85/0x181 [ 38.265262] debug_check_no_locks_held.cold.49+0x93/0x9f [ 38.270694] flush_old_exec+0x1ea2/0x2480 [ 38.274822] ? save_stack+0x43/0xd0 [ 38.278428] ? __kmalloc+0x15b/0x760 [ 38.282126] ? copy_strings_kernel+0x110/0x110 [ 38.286689] ? iov_iter_init+0xe5/0x210 [ 38.290647] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 38.296162] ? __vfs_read+0x11f/0x9b0 [ 38.299942] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.305458] ? fsnotify+0x50e/0xef0 [ 38.309068] ? fsnotify+0xef0/0xef0 [ 38.312694] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.318237] ? fsnotify_first_mark+0x350/0x350 [ 38.322795] ? __fsnotify_parent+0xcc/0x430 [ 38.327097] ? fsnotify+0xef0/0xef0 [ 38.330703] ? rw_verify_area+0x118/0x360 [ 38.334835] ? vfs_read+0x1ce/0x3c0 [ 38.338450] ? kernel_read+0xab/0x120 [ 38.342232] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 38.347223] ? load_elf_phdrs+0x1e4/0x270 [ 38.351347] ? writenote+0x3d0/0x3d0 [ 38.355074] ? __kasan_slab_free+0x119/0x150 [ 38.359480] load_elf_binary+0xa9a/0x5cf0 [ 38.363608] ? find_held_lock+0x36/0x1c0 [ 38.367652] ? notesize.isra.6+0x80/0x80 [ 38.371692] ? ima_file_mmap+0x160/0x160 [ 38.375730] ? lock_downgrade+0x900/0x900 [ 38.379879] ? kasan_check_write+0x14/0x20 [ 38.384093] search_binary_handler+0x17d/0x570 [ 38.388656] __do_execve_file.isra.33+0x1661/0x25d0 [ 38.393651] ? prepare_bprm_creds+0x120/0x120 [ 38.398139] ? usercopy_warn+0x110/0x110 [ 38.402185] ? check_preemption_disabled+0x48/0x280 [ 38.407212] ? rcu_lockdep_current_cpu_online+0x1a4/0x210 [ 38.412729] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 38.418247] ? strncpy_from_user+0x411/0x5a0 [ 38.422655] ? digsig_verify+0x1530/0x1530 [ 38.426869] ? kmem_cache_alloc+0x33a/0x730 [ 38.431168] ? lockdep_hardirqs_on+0x3bb/0x5b0 [ 38.435754] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.441267] __x64_sys_execveat+0xed/0x130 [ 38.445485] do_syscall_64+0x1b9/0x820 [ 38.449357] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 38.454698] ? syscall_return_slowpath+0x5e0/0x5e0 [ 38.459608] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 38.464430] ? trace_hardirqs_on_caller+0x310/0x310 [ 38.469424] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 38.474419] ? prepare_exit_to_usermode+0x291/0x3b0 [ 38.479413] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 38.484235] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 38.489419] RIP: 0033:0x445629 [ 38.492622] Code: e8 6c b6 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 2b 12 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 38.511500] RSP: 002b:00007f656054ada8 EFLAGS: 00000246 ORIG_RAX: 0000000000000142 [ 38.519203] RAX: ffffffffffffffda RBX: 00000000006dac28 RCX: 0000000000445629 [ 38.526448] RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000003 [ 38.533693] RBP: 00000000006dac20 R08: 0000000000001000 R09: 0000000000000000 [ 38.540938] R10: 0000000000000000 R11: 000