[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [ 67.952381][ T26] audit: type=1800 audit(1577909473.644:25): pid=9267 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 67.972376][ T26] audit: type=1800 audit(1577909473.644:26): pid=9267 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 68.024995][ T26] audit: type=1800 audit(1577909473.654:27): pid=9267 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.101' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 76.013537][ T9420] ------------[ cut here ]------------ [ 76.019046][ T9420] WARNING: CPU: 1 PID: 9420 at fs/overlayfs/file.c:55 ovl_real_fdget_meta+0x4a3/0x540 [ 76.028784][ T9420] Kernel panic - not syncing: panic_on_warn set ... [ 76.035364][ T9420] CPU: 1 PID: 9420 Comm: syz-executor247 Not tainted 5.5.0-rc2-next-20191220-syzkaller #0 [ 76.045236][ T9420] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 76.055755][ T9420] Call Trace: [ 76.059039][ T9420] dump_stack+0x197/0x210 [ 76.063374][ T9420] ? ovl_real_fdget_meta+0x400/0x540 [ 76.068672][ T9420] panic+0x2e3/0x75c [ 76.072569][ T9420] ? add_taint.cold+0x16/0x16 [ 76.077241][ T9420] ? printk+0xba/0xed [ 76.081209][ T9420] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 76.086672][ T9420] ? __warn.cold+0x14/0x3e [ 76.091086][ T9420] ? __warn+0xd9/0x1cf [ 76.095138][ T9420] ? ovl_real_fdget_meta+0x4a3/0x540 [ 76.100404][ T9420] __warn.cold+0x2f/0x3e [ 76.104641][ T9420] ? report_bug.cold+0x63/0xb2 [ 76.109488][ T9420] ? ovl_real_fdget_meta+0x4a3/0x540 [ 76.114757][ T9420] report_bug+0x289/0x300 [ 76.119080][ T9420] do_error_trap+0x11b/0x200 [ 76.123701][ T9420] do_invalid_op+0x37/0x50 [ 76.128219][ T9420] ? ovl_real_fdget_meta+0x4a3/0x540 [ 76.133499][ T9420] invalid_op+0x23/0x30 [ 76.137641][ T9420] RIP: 0010:ovl_real_fdget_meta+0x4a3/0x540 [ 76.143523][ T9420] Code: ff 4c 89 f7 e8 8e 7d 2d ff e9 fb fc ff ff e8 84 7d 2d ff e9 c7 fc ff ff 4c 89 f7 e8 17 7e 2d ff e9 5e fd ff ff e8 ed 92 ef fe <0f> 0b 41 bc fb ff ff ff e9 f9 fc ff ff e8 7b 7d 2d ff e9 85 fb ff [ 76.163120][ T9420] RSP: 0018:ffffc900028273e8 EFLAGS: 00010293 [ 76.169166][ T9420] RAX: ffff8880939c2040 RBX: 0000000004048000 RCX: ffffffff8285c076 [ 76.177122][ T9420] RDX: 0000000000000000 RSI: ffffffff8285c2a3 RDI: 0000000000000005 [ 76.185183][ T9420] RBP: ffffc90002827418 R08: ffff8880939c2040 R09: 0000000000000000 [ 76.193148][ T9420] R10: ffffed1043789756 R11: ffff88821bc4bab3 R12: 000000000000a000 [ 76.201102][ T9420] R13: ffff888098c80280 R14: ffff888098c802f8 R15: ffff888090292608 [ 76.209123][ T9420] ? ovl_real_fdget_meta+0x276/0x540 [ 76.214420][ T9420] ? ovl_real_fdget_meta+0x4a3/0x540 [ 76.219700][ T9420] ? ovl_real_fdget_meta+0x4a3/0x540 [ 76.225013][ T9420] ovl_read_iter+0x11a/0x370 [ 76.229605][ T9420] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 76.235837][ T9420] ? ovl_mmap+0x300/0x300 [ 76.240153][ T9420] ? fsnotify+0xbb0/0xbb0 [ 76.244467][ T9420] do_iter_readv_writev+0x711/0x8f0 [ 76.249648][ T9420] ? no_seek_end_llseek_size+0x70/0x70 [ 76.255120][ T9420] ? rw_verify_area+0x126/0x360 [ 76.259951][ T9420] do_iter_read+0x27c/0x660 [ 76.264435][ T9420] ? dup_iter+0x260/0x260 [ 76.268756][ T9420] vfs_readv+0xf0/0x160 [ 76.272891][ T9420] ? compat_rw_copy_check_uvector+0x4c0/0x4c0 [ 76.278942][ T9420] ? push_pipe+0x3e2/0x6a0 [ 76.283354][ T9420] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 76.289576][ T9420] ? iov_iter_get_pages_alloc+0x3a5/0x15b0 [ 76.295361][ T9420] ? iov_iter_for_each_range+0x7d0/0x7d0 [ 76.301008][ T9420] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 76.306717][ T9420] default_file_splice_read+0x4fb/0xa20 [ 76.312255][ T9420] ? __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 76.318101][ T9420] ? kasan_kmalloc+0x9/0x10 [ 76.322598][ T9420] ? __kmalloc+0x163/0x770 [ 76.327020][ T9420] ? iter_file_splice_write+0xc10/0xc10 [ 76.332563][ T9420] ? __lock_acquire+0x16f2/0x4a00 [ 76.337573][ T9420] ? __lock_acquire+0x16f2/0x4a00 [ 76.342581][ T9420] ? lock_downgrade+0x920/0x920 [ 76.347415][ T9420] ? rcu_read_lock_held+0x9c/0xb0 [ 76.352428][ T9420] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 76.358865][ T9420] ? fsnotify+0x7fd/0xbb0 [ 76.363220][ T9420] ? security_file_permission+0x8f/0x380 [ 76.368859][ T9420] ? rw_verify_area+0x126/0x360 [ 76.373700][ T9420] ? iter_file_splice_write+0xc10/0xc10 [ 76.379230][ T9420] do_splice_to+0x127/0x180 [ 76.383734][ T9420] splice_direct_to_actor+0x320/0xa30 [ 76.389095][ T9420] ? generic_pipe_buf_nosteal+0x10/0x10 [ 76.394650][ T9420] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 76.400883][ T9420] ? do_splice_to+0x180/0x180 [ 76.405546][ T9420] ? rw_verify_area+0x126/0x360 [ 76.410382][ T9420] do_splice_direct+0x1da/0x2a0 [ 76.416190][ T9420] ? splice_direct_to_actor+0xa30/0xa30 [ 76.421746][ T9420] ? rw_verify_area+0x126/0x360 [ 76.426582][ T9420] do_sendfile+0x597/0xd00 [ 76.430993][ T9420] ? do_compat_pwritev64+0x1c0/0x1c0 [ 76.436271][ T9420] ? do_fcntl+0xb0/0x1030 [ 76.441539][ T9420] ? f_getown+0xc0/0xc0 [ 76.445681][ T9420] ? do_sys_open+0xfc/0x190 [ 76.450172][ T9420] __x64_sys_sendfile64+0x1dd/0x220 [ 76.455351][ T9420] ? __ia32_sys_sendfile+0x230/0x230 [ 76.460619][ T9420] ? do_syscall_64+0x26/0x790 [ 76.465758][ T9420] ? lockdep_hardirqs_on+0x421/0x5e0 [ 76.471058][ T9420] ? trace_hardirqs_on+0x67/0x240 [ 76.476082][ T9420] do_syscall_64+0xfa/0x790 [ 76.480587][ T9420] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 76.486477][ T9420] RIP: 0033:0x4402f9 [ 76.490356][ T9420] 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 [ 76.510503][ T9420] RSP: 002b:00007ffec66aece8 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 [ 76.518909][ T9420] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004402f9 [ 76.526867][ T9420] RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000003 [ 76.534826][ T9420] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 76.542815][ T9420] R10: 0000800000000024 R11: 0000000000000246 R12: 0000000000401b80 [ 76.550783][ T9420] R13: 0000000000401c10 R14: 0000000000000000 R15: 0000000000000000 [ 76.560456][ T9420] Kernel Offset: disabled [ 76.564854][ T9420] Rebooting in 86400 seconds..