[ 84.817388][ T27] audit: type=1400 audit(1582612862.266:38): avc: denied { watch } for pid=10585 comm="restorecond" path="/etc/selinux/restorecond.conf" dev="sda1" ino=2232 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 85.120429][ T27] audit: type=1800 audit(1582612862.626:39): pid=10498 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 [ 85.142142][ T27] audit: type=1800 audit(1582612862.626:40): pid=10498 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 [ 85.959241][ T27] audit: type=1400 audit(1582612863.466:41): avc: denied { map } for pid=10676 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 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.48' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 92.783939][ T27] audit: type=1400 audit(1582612870.286:42): avc: denied { map } for pid=10688 comm="syz-executor278" path="/root/syz-executor278656798" 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 [ 92.819530][T10688] [ 92.821887][T10688] ====================================================== [ 92.828919][T10688] WARNING: possible circular locking dependency detected [ 92.835952][T10688] 5.6.0-rc3-syzkaller #0 Not tainted [ 92.841240][T10688] ------------------------------------------------------ [ 92.848571][T10688] syz-executor278/10688 is trying to acquire lock: [ 92.855094][T10688] ffff88809363d2a0 (&tty->termios_rwsem){++++}, at: n_tty_receive_buf_common+0x8a/0x2b70 [ 92.865257][T10688] [ 92.865257][T10688] but task is already holding lock: [ 92.873006][T10688] ffffffff8a13cc40 (sel_lock){+.+.}, at: paste_selection+0x15a/0x4d0 [ 92.881318][T10688] [ 92.881318][T10688] which lock already depends on the new lock. [ 92.881318][T10688] [ 92.891735][T10688] [ 92.891735][T10688] the existing dependency chain (in reverse order) is: [ 92.900843][T10688] [ 92.900843][T10688] -> #2 (sel_lock){+.+.}: [ 92.907379][T10688] __mutex_lock+0x156/0x13c0 [ 92.912497][T10688] mutex_lock_nested+0x16/0x20 [ 92.917798][T10688] set_selection_kernel+0x39d/0x13d0 [ 92.923618][T10688] set_selection_user+0x95/0xd9 [ 92.929006][T10688] tioclinux+0x11c/0x480 [ 92.933759][T10688] vt_ioctl+0x1a41/0x26c0 [ 92.938600][T10688] tty_ioctl+0xa37/0x14f0 [ 92.943447][T10688] ksys_ioctl+0x123/0x180 [ 92.948286][T10688] __x64_sys_ioctl+0x73/0xb0 [ 92.953388][T10688] do_syscall_64+0xfa/0x790 [ 92.958402][T10688] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 92.964853][T10688] [ 92.964853][T10688] -> #1 (console_lock){+.+.}: [ 92.971795][T10688] console_lock+0x47/0x80 [ 92.976634][T10688] con_flush_chars+0x3d/0xa0 [ 92.981739][T10688] n_tty_write+0xc85/0x1080 [ 92.986750][T10688] tty_write+0x496/0x7f0 [ 92.991505][T10688] __vfs_write+0x8a/0x110 [ 92.996349][T10688] vfs_write+0x268/0x5d0 [ 93.001241][T10688] ksys_write+0x14f/0x290 [ 93.006082][T10688] __x64_sys_write+0x73/0xb0 [ 93.011490][T10688] do_syscall_64+0xfa/0x790 [ 93.016695][T10688] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 93.023098][T10688] [ 93.023098][T10688] -> #0 (&tty->termios_rwsem){++++}: [ 93.030557][T10688] __lock_acquire+0x2596/0x4a00 [ 93.035918][T10688] lock_acquire+0x190/0x410 [ 93.041065][T10688] down_read+0x95/0x430 [ 93.045917][T10688] n_tty_receive_buf_common+0x8a/0x2b70 [ 93.052548][T10688] n_tty_receive_buf2+0x34/0x40 [ 93.057914][T10688] tty_ldisc_receive_buf+0xad/0x1c0 [ 93.063671][T10688] paste_selection+0x1ff/0x4d0 [ 93.068981][T10688] tioclinux+0x133/0x480 [ 93.073786][T10688] vt_ioctl+0x1a41/0x26c0 [ 93.078669][T10688] tty_ioctl+0xa37/0x14f0 [ 93.083509][T10688] ksys_ioctl+0x123/0x180 [ 93.088394][T10688] __x64_sys_ioctl+0x73/0xb0 [ 93.093622][T10688] do_syscall_64+0xfa/0x790 [ 93.098766][T10688] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 93.105174][T10688] [ 93.105174][T10688] other info that might help us debug this: [ 93.105174][T10688] [ 93.115856][T10688] Chain exists of: [ 93.115856][T10688] &tty->termios_rwsem --> console_lock --> sel_lock [ 93.115856][T10688] [ 93.128342][T10688] Possible unsafe locking scenario: [ 93.128342][T10688] [ 93.135823][T10688] CPU0 CPU1 [ 93.141177][T10688] ---- ---- [ 93.146531][T10688] lock(sel_lock); [ 93.150334][T10688] lock(console_lock); [ 93.157007][T10688] lock(sel_lock); [ 93.163517][T10688] lock(&tty->termios_rwsem); [ 93.168359][T10688] [ 93.168359][T10688] *** DEADLOCK *** [ 93.168359][T10688] [ 93.176584][T10688] 3 locks held by syz-executor278/10688: [ 93.182202][T10688] #0: ffff88809363d090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 93.191146][T10688] #1: ffff8880955480a8 (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x30/0x40 [ 93.200777][T10688] #2: ffffffff8a13cc40 (sel_lock){+.+.}, at: paste_selection+0x15a/0x4d0 [ 93.209792][T10688] [ 93.209792][T10688] stack backtrace: [ 93.215677][T10688] CPU: 0 PID: 10688 Comm: syz-executor278 Not tainted 5.6.0-rc3-syzkaller #0 [ 93.224468][T10688] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 93.234640][T10688] Call Trace: [ 93.238088][T10688] dump_stack+0x197/0x210 [ 93.242558][T10688] print_circular_bug.isra.0.cold+0x163/0x172 [ 93.248677][T10688] check_noncircular+0x32e/0x3e0 [ 93.253613][T10688] ? print_circular_bug.isra.0+0x230/0x230 [ 93.259413][T10688] ? alloc_list_entry+0xc0/0xc0 [ 93.264252][T10688] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 93.270567][T10688] ? find_first_zero_bit+0x9a/0xc0 [ 93.275722][T10688] __lock_acquire+0x2596/0x4a00 [ 93.280561][T10688] ? save_trace+0x49/0x830 [ 93.284964][T10688] ? mark_held_locks+0xf0/0xf0 [ 93.289717][T10688] lock_acquire+0x190/0x410 [ 93.294255][T10688] ? n_tty_receive_buf_common+0x8a/0x2b70 [ 93.299966][T10688] down_read+0x95/0x430 [ 93.304107][T10688] ? n_tty_receive_buf_common+0x8a/0x2b70 [ 93.309868][T10688] ? down_read_killable+0x490/0x490 [ 93.315058][T10688] n_tty_receive_buf_common+0x8a/0x2b70 [ 93.320591][T10688] ? paste_selection+0x15a/0x4d0 [ 93.325511][T10688] ? mark_lock+0xc2/0x1220 [ 93.329920][T10688] ? mutex_trylock+0x2d0/0x2d0 [ 93.334789][T10688] ? mark_held_locks+0xa4/0xf0 [ 93.339678][T10688] ? lockdep_hardirqs_on+0x421/0x5e0 [ 93.344953][T10688] n_tty_receive_buf2+0x34/0x40 [ 93.349833][T10688] tty_ldisc_receive_buf+0xad/0x1c0 [ 93.355017][T10688] ? n_tty_receive_buf_common+0x2b70/0x2b70 [ 93.360903][T10688] paste_selection+0x1ff/0x4d0 [ 93.365656][T10688] ? sel_pos+0x90/0x90 [ 93.369717][T10688] ? lock_downgrade+0x920/0x920 [ 93.374711][T10688] ? wake_up_q+0x140/0x140 [ 93.379165][T10688] tioclinux+0x133/0x480 [ 93.383396][T10688] vt_ioctl+0x1a41/0x26c0 [ 93.387753][T10688] ? complete_change_console+0x3a0/0x3a0 [ 93.393372][T10688] ? tomoyo_execute_permission+0x4a0/0x4a0 [ 93.399210][T10688] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 93.405101][T10688] ? tty_jobctrl_ioctl+0x50/0xd40 [ 93.410115][T10688] ? complete_change_console+0x3a0/0x3a0 [ 93.415740][T10688] tty_ioctl+0xa37/0x14f0 [ 93.420058][T10688] ? tty_vhangup+0x30/0x30 [ 93.424466][T10688] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 93.430757][T10688] ? do_vfs_ioctl+0x568/0x13b0 [ 93.435511][T10688] ? ioctl_file_clone+0x180/0x180 [ 93.440522][T10688] ? selinux_file_mprotect+0x620/0x620 [ 93.445972][T10688] ? file_open_root+0x430/0x430 [ 93.450819][T10688] ? tomoyo_file_ioctl+0x23/0x30 [ 93.455745][T10688] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 93.461977][T10688] ? security_file_ioctl+0x8d/0xc0 [ 93.467123][T10688] ? tty_vhangup+0x30/0x30 [ 93.471568][T10688] ksys_ioctl+0x123/0x180 [ 93.475889][T10688] __x64_sys_ioctl+0x73/0xb0 [ 93.480620][T10688] do_syscall_64+0xfa/0x790 [ 93.485115][T10688] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 93.490997][T10688] RIP: 0033:0x440269 [ 93.494880][T10688] 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 5b 14 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 93.514581][T10688] RSP: 002b:00007ffc7db1dce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 93.523096][T10688] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440269 [ 93.531258][T10688] RDX: 0000000020000040 RSI: 000000000000541c RDI: 00