weird Ctrl-T debug messages

[Hartmann, O.]

Running poudriere on recent CURRENT with (recent) 12-STABLE and CURRENT
jails reveals a weird behaviour recently when hitting Ctrl-T:

[...]

[13:37:48] [01] [00:00:00] Building databases/sqlitestudio |
sqlitestudio-3.2.1.1002 load: 26.95  cmd: sh 99331 [piperd] 49375.18r
0.59u 0.59s 0% 2144k #0 0xffffffff80924ace at mi_switch+0xbe
#1 0xffffffff809781d4 at sleepq_catch_signals+0x4a4
#2 0xffffffff80977d19 at sleepq_wait_sig+0x9
#3 0xffffffff809241ad at _sleep+0x1ad
#4 0xffffffff8098ae5a at pipe_read+0x43a
#5 0xffffffff80987a85 at dofileread+0x85
#6 0xffffffff8098766f at sys_read+0xcf
#7 0xffffffff80d70229 at amd64_syscall+0x119
#8 0xffffffff80d47bf0 at fast_syscall_common+0x101

Is this debug fallout from /bin/sh?

Kind regards,

oh
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