On 19 Apr 2020, at 22:54, David M. Cotter wrote:
i have discovered it may have to do with permissions / entitlements
that have been granted the app by the user, and that resetting all
perms to default will "fix" the problem
I think you are right about this being a permission / “sandbox”
issue, because the 3 folders in question are all folders that macOS
10.15 now require special permission to read (even though in my case, I
just request their display name).
Furthermore, it could explain why there is no delay when launched from
terminal, as the process will inherit the entitlements of the terminal,
which may have some special entitlements for the full disk access.
Unfortunately though I can’t figure out *what* the problem is; running
`tccutil reset All` (and rebooting) did not fix it.
I have tried the code in question in a signed and notarized app that has
been granted full disk access, yet it still has the delay.
A spindump does indicate it is a “sandbox” issue:
*182 getattrlist + 136 (kernel + 3512472) [0xffffff8000559898]
*182 ??? (kernel + 3512820) [0xffffff80005599f4]
*181 ??? (kernel + 3501529) [0xffffff8000556dd9]
*181 ??? (kernel + 3490836) [0xffffff8000554414]
*181 mac_vnode_check_access + 154 (kernel + 9093082)
[0xffffff8000aabfda]
*181 hook_vnode_check_access + 167 (Sandbox + 39552)
[0xffffff7f823a7a80]
*181 sb_evaluate + 5004 (Sandbox + 67658)
[0xffffff7f823ae84a]
*181 approval_response_wait + 142 (Sandbox + 154851)
[0xffffff7f823c3ce3]
*181 __WAITING_ON_APPROVAL_FROM_SANDBOXD__ + 23
(Sandbox + 155134) [0xffffff7f823c3dfe]
*181 ??? (kernel + 6855402) [0xffffff8000889aea]
*181 thread_block_reason + 175 (kernel +
1317935) [0xffffff8000341c2f]
*181 ??? (kernel + 1324017)
[0xffffff80003433f1]
*181 machine_switch_context + 200 (kernel
+ 2388456) [0xffffff80004471e8]
That’s 181 milliseconds spent __WAITING_ON_APPROVAL_FROM_SANDBOXD__ in
a non-sandboxed app obtaining display name for 3 folders in the user’s
home directory.
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