Light client: Error removing stale DAG cache - PermissionDenied

[Tbaut]

Before filing a new issue, please provide the following information.

I'm running:

• Which Parity version?: 1.11.4
• Which operating system?: Windows
• How installed?: via binaries
• Are you fully synchronized?: no
• Which network are you connected to?: ethereum
• Did you try to restart the node?: yes

Your issue description goes here below. Try to include actual vs. expected behavior and steps to reproduce the issue.

During the light synchronization, the following error appears regularly:
Error removing stale DAG cache: Os { code: 5, kind: PermissionDenied, message: "Accès refusé." }

2018-06-25 22:45:17  Syncing #1941063 0x86fb…96d0     0 hdr/s      0+    0 Qed  #1941063   13/50 peers     10 MiB cache  0 bytes queue  RPC:  0 conn,  0 req/s,   0 µs
2018-06-25 22:45:22  Syncing #1941063 0x86fb…96d0     0 hdr/s      0+    0 Qed  #1941063    7/50 peers     10 MiB cache  0 bytes queue  RPC:  0 conn,  0 req/s,   0 µs
2018-06-25 22:45:27  Syncing #1946240 0xbc61…a487  1029 hdr/s  19140+    0 Qed  #1946240   15/50 peers     10 MiB cache   14 MiB queue  RPC:  0 conn,  0 req/s,   0 µs
2018-06-25 22:45:31  Error removing stale DAG cache: Os { code: 5, kind: PermissionDenied, message: "Accès refusé." }
2018-06-25 22:45:32  Syncing #1950452 0x017d…8cac   837 hdr/s  14926+    1 Qed  #1950452   11/50 peers     10 MiB cache   11 MiB queue  RPC:  0 conn,  0 req/s,   0 µs
2018-06-25 22:45:37  Syncing #1956484 0xe827…c748  1201 hdr/s  10941+    0 Qed  #1956484   11/50 peers     10 MiB cache    8 MiB queue  RPC:  0 conn,  0 req/s,   0 µs
2018-06-25 22:45:42  Syncing #1962476 0x0457…1ec4  1194 hdr/s   4952+    1 Qed  #1962476   10/50 peers     10 MiB cache    4 MiB queue  RPC:  0 conn,  0 req/s,   0 µs
2018-06-25 22:45:47  Syncing #1967432 0x3c58…b7af   989 hdr/s      0+    0 Qed  #1967432    9/50 peers     10 MiB cache  0 bytes queue  RPC:  0 conn,  0 req/s,   0 µs
2018-06-25 22:45:52  Syncing #1967432 0x3c58…b7af     0 hdr/s      0+    0 Qed  #1967432   10/50 peers     10 MiB cache  0 bytes queue  RPC:  0 conn,  0 req/s,   0 µs
2018-06-25 22:45:57  Syncing #1967432 0x3c58…b7af     0 hdr/s      0+    0 Qed  #1967432   11/50 peers     10 MiB cache  0 bytes queue  RPC:  0 conn,  0 req/s,   0 µs
2018-06-25 22:46:02  Syncing #1967432 0x3c58…b7af     0 hdr/s      0+    0 Qed  #1967432   15/50 peers     10 MiB cache  0 bytes queue  RPC:  0 conn,  0 req/s,   0 µs
2018-06-25 22:46:07  Syncing #1967432 0x3c58…b7af     0 hdr/s      0+    0 Qed  #1967432   14/50 peers     10 MiB cache  0 bytes queue  RPC:  0 conn,  0 req/s,   0 µs
2018-06-25 22:46:12  Syncing #1967432 0x3c58…b7af     0 hdr/s      0+    0 Qed  #1967432   15/50 peers     10 MiB cache  0 bytes queue  RPC:  0 conn,  0 req/s,   0 µs
2018-06-25 22:46:17  Syncing #1967432 0x3c58…b7af     0 hdr/s      0+    0 Qed  #1967432   14/50 peers     10 MiB cache  0 bytes queue  RPC:  0 conn,  0 req/s,   0 µs
2018-06-25 22:46:22  Syncing #1972878 0xff13…7632  1082 hdr/s   4278+    0 Qed  #1972878   13/50 peers     10 MiB cache    3 MiB queue  RPC:  0 conn,  0 req/s,   0 µs
2018-06-25 22:46:27  Syncing #1977160 0x27f0…6b24   856 hdr/s      0+    0 Qed  #1977160   14/50 peers     10 MiB cache  0 bytes queue  RPC:  0 conn,  0 req/s,   0 µs
2018-06-25 22:46:32  Syncing #1977160 0x27f0…6b24     0 hdr/s      0+    0 Qed  #1977160   16/50 peers     10 MiB cache  0 bytes queue  RPC:  0 conn,  0 req/s,   0 µs
2018-06-25 22:46:37  Syncing #1977814 0xc635…af8a   129 hdr/s  29806+    0 Qed  #1977814   15/50 peers     10 MiB cache   22 MiB queue  RPC:  0 conn,  0 req/s,   0 µs
2018-06-25 22:46:40  Error removing stale DAG cache: Os { code: 5, kind: PermissionDenied, message: "Accès refusé." }
2018-06-25 22:46:42  Syncing #1982193 0x464b…d4de   873 hdr/s  29139+    0 Qed  #1982193   10/50 peers     10 MiB cache   22 MiB queue  RPC:  0 conn,  0 req/s,   0 µs
2018-06-25 22:46:47  Syncing #1988468 0x2879…a7a5  1246 hdr/s  29131+    0 Qed  #1988468    9/50 peers     10 MiB cache   22 MiB queue  RPC:  0 conn,  0 req/s,   0 µs
2018-06-25 22:46:52  Syncing #1994766 0xdbc2…d0b3  1256 hdr/s  29110+    2 Qed  #1994766   10/50 peers     10 MiB cache   22 MiB queue  RPC:  0 conn,  0 req/s,   0 µs
2018-06-25 22:46:57  Syncing #2001016 0xf4cf…1dc5  1243 hdr/s  29390+    1 Qed  #2001016   13/50 peers     10 MiB cache   22 MiB queue  RPC:  0 conn,  0 req/s,   0 µs
2018-06-25 22:47:02  Syncing #2007212 0x8010…be2e  1235 hdr/s  23194+    1 Qed  #2007212   10/50 peers     10 MiB cache   17 MiB queue  RPC:  0 conn,  0 req/s,   0 µs
2018-06-25 22:47:06  Error removing stale DAG cache: Os { code: 5, kind: PermissionDenied, message: "Accès refusé." }
2018-06-25 22:47:07  Syncing #2011630 0x9085…1886   867 hdr/s  18775+    0 Qed  #2011630   11/50 peers     10 MiB cache   14 MiB queue  RPC:  0 conn,  0 req/s,   0 µs
2018-06-25 22:47:12  Syncing #2017813 0x1f9b…7436  1233 hdr/s  12592+    1 Qed  #2017813   11/50 peers     10 MiB cache    9 MiB queue  RPC:  0 conn,  0 req/s,   0 µs
2018-06-25 22:47:17  Syncing #2023972 0x9d9f…3879  1227 hdr/s   6433+    0 Qed  #2023972    9/50 peers     10 MiB cache    5 MiB queue  RPC:  0 conn,  0 req/s,   0 µs

Some user witnessed it in the past: #6319 (comment)

[Tbaut]

Close as stalled. I'll reopen if it happens again.