hung unmount haikuporter

gistfile1.txt

unmount: unmounting failed: Device/File/Resource busy
unmounting /Data/Code/haikuports/media-libs/harfbuzz/work-8.3.0/boot/system failed - wait and retry ...
unmount: unmounting failed: Device/File/Resource busy
unmounting /Data/Code/haikuports/media-libs/harfbuzz/work-8.3.0/boot/system failed - wait and retry ...
unmount: unmounting failed: Device/File/Resource busy
unmounting /Data/Code/haikuports/media-libs/harfbuzz/work-8.3.0/boot/system failed - wait and retry ...
unmount: unmounting failed: Device/File/Resource busy
unmounting /Data/Code/haikuports/media-libs/harfbuzz/work-8.3.0/boot/system failed - wait and retry ...
unmount: unmounting failed: Device/File/Resource busy
Unable to unmount /Data/Code/haikuports/media-libs/harfbuzz/work-8.3.0/boot/system.
FDs in use by applications:
Haikuporter could not unmount 'system' volume in chroot. Would you like to force an unmount? [y/N]y0
Forcing unmount


/bin/unmount -f /Data/Code/haikuports/media-libs/harfbuzz/work-  4356        1    0    0 

/Data/Code/haikuporter> strace -t 4356




/Data/Code/haikuporter> ls /Data/Code/haikuports/media-libs/harfbuzz/work-8.3.0/system/
add-ons  apps  bin  boot  cache  data  demos  Deskbar  develop  documentation  haiku_loader.bios_ia32  kernel_x86_64  lib  non-packaged  package-links  packages  preferences  runtime_loader  servers  settings  share  Tracker  var

 strace -T -s -t unmount -f /Data/Code/haikuports/media-libs/harfbuzz/work-8.3.0/system
[  4590] <... image_relocated resumed>  (41 us)
[  4590] set_area_protection(0x2df9a, B_READ_AREA|B_EXECUTE_AREA) = 0x0 No error (66 us)
[  4590] set_area_protection(0x2df9c, B_READ_AREA|B_EXECUTE_AREA) = 0x0 No error (24 us)
[  4590] set_area_protection(0x2df9f, B_READ_AREA|B_EXECUTE_AREA) = 0x0 No error (20 us)
[  4590] get_system_info(0x7f68b22c4400) = 0x0 No error (24 us)
[  4590] get_system_info(0x7f68b22c4200) = 0x0 No error (29 us)
[  4590] reserve_address_range([0x100100000000], B_RANDOMIZED_BASE_ADDRESS, 0x1000000000) = 0x0 No error ([0x108a3bd58000]) (46 us)
[  4590] create_area("heap", [0x108a3bd58000], B_EXACT_ADDRESS, 0x40000, 0x0, B_READ_AREA|B_WRITE_AREA) = 0x2dfa2 ([0x108a3bd58000]) (48 us)
[  4590] resize_area(0x2dfa2, 0xa0000) = 0x0 No error (26 us)
[  4590] resize_area(0x2dfa2, 0xc0000) = 0x0 No error (61 us)
[  4590] open(0xffffffff, "/dev/random", 0, 0x0) = 0x3 (39 us)
[  4590] read(0x3, 0xffffffffffffffff, 0x1c1a6053988, 0x8) = 0x8 (20 us)
[  4590] close(0x3) = 0x0 No error (17 us)
[  4590] resize_area(0x2dfa2, 0xd0000) = 0x0 No error (21 us)
[  4590] read_stat(0xffffffff, "/Data/Code/haikuports/media-libs/harfbuzz/work-8.3.0/system", true, 0x7f68b22c4670, 0x80) = 0x0 No error (59 us)


/bin/unmount -f /Data/Code/haikuports/media-libs/harfbuzz/work-  4356        1    0    0 
/bin/unmount -f /Data/Code/haikuports/media-libs/harfbuzz/work-  4562        1    0    0 
/bin/unmount -f /Data/Code/haikuports/media-libs/harfbuzz/work-  4580        1    0    0 
/bin/unmount -f /Data/Code/haikuports/media-libs/harfbuzz/work-  4586        1    0    0 
/bin/unmount -f /Data/Code/haikuports/media-libs/harfbuzz/work-  4590        1    0    0 


sync command...

syslog:
KERN: sync: device 9 couldn't sync: Device/File/Resource busy

 fdinfo -d /Data/Code/haikuports/media-libs/harfbuzz/work-8.3.0
    1  10  R/W  7:584587 kernel_team
    1 106  R    7:5436954 kernel_team


 fdinfo -d /Data/Code/haikuports/media-libs/harfbuzz/work-8.3.0/system
 1086  11  R    4:97880 /boot/system/servers/debug_server
 1158   7  R    4:97909 /boot/system/Tracker
 1158   9  R    4:97648 /boot/system/Tracker
 1158  14  R    4:97727 /boot/system/Tracker
 1158  15  R    4:97718 /boot/system/Tracker
 1158  16  R    4:97693 /boot/system/Tracker
 1161   7  R    4:97648 /boot/system/Deskbar
 1497   4  R    4:98477 /boot/system/data/deskbar/menu/Applications/Terminal
 1497   5  R    4:98477 /boot/system/data/deskbar/menu/Applications/Terminal
 1497   7  R    4:97909 /boot/system/data/deskbar/menu/Applications/Terminal
 1497   9  R    4:97648 /boot/system/data/deskbar/menu/Applications/Terminal
 1503   7  R    4:97909 /bin/bash -l
 1503   9  R    4:97648 /bin/bash -l
 1689   7  R    4:97909 /boot/system/data/deskbar/menu/Applications/WebPositive
 1689   9  R    4:97648 /boot/system/data/deskbar/menu/Applications/WebPositive
 1689  16  R    4:97909 /boot/system/data/deskbar/menu/Applications/WebPositive
 4375   7  R    4:97909 /bin/bash -l
 4375   9  R    4:97648 /bin/bash -l
 4400   7  R    4:97909 /bin/bash -l
 4400   9  R    4:97648 /bin/bash -l
 4518   7  R    4:97909 /bin/bash -l
 4518   9  R    4:97648 /bin/bash -l
 4665   7  R    4:97909 /bin/bash -l
 4665   9  R    4:97648 /bin/bash -l