[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [ 35.064280] sshd (6143) used greatest stack depth: 15232 bytes left [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.451867] audit: type=1800 audit(1543872498.359:33): pid=6079 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 35.474720] audit: type=1800 audit(1543872498.359:34): pid=6079 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 37.598950] audit: type=1400 audit(1543872500.509:35): avc: denied { map } for pid=6255 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 '10.128.0.114' (ECDSA) to the list of known hosts. executing program [ 44.326015] audit: type=1400 audit(1543872507.239:36): avc: denied { map } for pid=6269 comm="syz-executor675" path="/root/syz-executor675352391" 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 [ 44.355313] [ 44.356955] ==================================== [ 44.361698] WARNING: syz-executor675/6270 still has locks held! [ 44.367946] 4.20.0-rc5+ #141 Not tainted [ 44.372011] ------------------------------------ [ 44.376825] 1 lock held by syz-executor675/6270: [ 44.381587] #0: 000000007aabb990 (&sig->cred_guard_mutex){+.+.}, at: prepare_bprm_creds+0x53/0x120 [ 44.390854] [ 44.390854] stack backtrace: [ 44.395384] CPU: 0 PID: 6270 Comm: syz-executor675 Not tainted 4.20.0-rc5+ #141 [ 44.402836] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.412177] Call Trace: [ 44.414761] dump_stack+0x244/0x39d [ 44.418383] ? dump_stack_print_info.cold.1+0x20/0x20 [ 44.423566] ? vprintk_func+0x85/0x181 [ 44.427446] debug_check_no_locks_held.cold.49+0x93/0x9f [ 44.432890] flush_old_exec+0x1ea2/0x2480 [ 44.437031] ? save_stack+0x43/0xd0 [ 44.440657] ? copy_strings_kernel+0x110/0x110 [ 44.445233] ? iov_iter_init+0xe5/0x210 [ 44.449201] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 44.454731] ? __vfs_read+0x11f/0x9b0 [ 44.458525] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 44.464102] ? fsnotify+0x50e/0xef0 [ 44.467722] ? fsnotify+0xef0/0xef0 [ 44.471340] ? fsnotify_first_mark+0x350/0x350 [ 44.475915] ? __fsnotify_parent+0xcc/0x430 [ 44.480227] ? fsnotify+0xef0/0xef0 [ 44.483853] ? rw_verify_area+0x118/0x360 [ 44.487993] ? vfs_read+0x1ce/0x3c0 [ 44.491614] ? kernel_read+0xab/0x120 [ 44.495407] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 44.500413] ? load_elf_phdrs+0x1e4/0x270 [ 44.504553] ? writenote+0x3d0/0x3d0 [ 44.508263] ? __kasan_slab_free+0x119/0x150 [ 44.512664] load_elf_binary+0xa9a/0x5cf0 [ 44.516827] ? find_held_lock+0x36/0x1c0 [ 44.520890] ? notesize.isra.6+0x80/0x80 [ 44.524947] ? ima_file_mmap+0x160/0x160 [ 44.529000] ? lock_downgrade+0x900/0x900 [ 44.533153] ? kasan_check_write+0x14/0x20 [ 44.537385] search_binary_handler+0x17d/0x570 [ 44.541963] __do_execve_file.isra.33+0x1661/0x25d0 [ 44.546974] ? prepare_bprm_creds+0x120/0x120 [ 44.551462] ? usercopy_warn+0x110/0x110 [ 44.555515] ? kmem_cache_alloc+0x58f/0x730 [ 44.559844] ? check_preemption_disabled+0x48/0x280 [ 44.564861] ? rcu_lockdep_current_cpu_online+0x1a4/0x210 [ 44.570391] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 44.575925] ? strncpy_from_user+0x411/0x5a0 [ 44.580329] ? digsig_verify+0x1530/0x1530 [ 44.584555] ? kmem_cache_alloc+0x33a/0x730 [ 44.588875] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 44.594811] __x64_sys_execveat+0xed/0x130 [ 44.599046] do_syscall_64+0x1b9/0x820 [ 44.602931] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 44.608399] ? syscall_return_slowpath+0x5e0/0x5e0 [ 44.613321] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 44.618158] ? trace_hardirqs_on_caller+0x310/0x310 [ 44.623167] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 44.628221] ? prepare_exit_to_usermode+0x291/0x3b0 [ 44.633233] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 44.638075] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 44.643256] RIP: 0033:0x445789 [ 44.646443] 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 [ 44.665335] RSP: 002b:00007fbffe16fdb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000142 [ 44.673031] RAX: ffffffffffffffda RBX: 00000000006