With newest -HEAD code, firefox is stuck in getbuf().
top
last pid: 1814; load averages: 0.00, 0.05, 0.07
up 0+00:37:11 10:54:01
135 processes: 1 running, 134 sleeping
CPU: 3.7% user, 0.0% nice, 0.6% system, 0.0% interrupt, 95.7% idle
Mem: 259M Active, 393M Inact, 151M Wired, 1484K Cache, 111M Buf, 186M Free
Swap: 2020M Total, 2020M Free
PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU
COMMAND
1427 davidxu 1 45 0 114M 101M select 0 1:24 0.29% Xorg
1588 davidxu 10 44 0 279M 145M getbuf 0 2:15 0.00%
firefox-bin
procstat -k 1588
PID TID COMM TDNAME KSTACK
1588 100200 firefox-bin initial thread mi_switch sleepq_switch
sleepq_wait _sleep getdirtybuf flush_deplist softdep_sync_metadata
ffs_syncvnode ffs_fsync VOP_FSYNC_APV fsync syscallenter syscall
Xint0x80_syscall
1588 100207 firefox-bin - mi_switch sleepq_switch
sleepq_catch_signals sleepq_wait_sig _cv_wait_sig seltdwait poll
syscallenter syscall Xint0x80_syscall
1588 100208 firefox-bin - mi_switch sleepq_switch
sleepq_catch_signals sleepq_wait_sig _sleep __umtx_op_cv_wait _umtx_op
syscallenter syscall Xint0x80_syscall
1588 100209 firefox-bin - mi_switch sleepq_switch
sleepq_catch_signals sleepq_timedwait_sig _sleep __umtx_op_cv_wait
_umtx_op syscallenter syscall Xint0x80_syscall
1588 100210 firefox-bin - mi_switch sleepq_switch
sleepq_catch_signals sleepq_timedwait_sig _sleep __umtx_op_cv_wait
_umtx_op syscallenter syscall Xint0x80_syscall
1588 100216 firefox-bin - mi_switch sleepq_switch
sleepq_catch_signals sleepq_wait_sig _sleep __umtx_op_cv_wait _umtx_op
syscallenter syscall Xint0x80_syscall
1588 100220 firefox-bin - mi_switch sleepq_switch
sleepq_wait _sleep getdirtybuf flush_deplist softdep_sync_metadata
ffs_syncvnode ffs_fsync VOP_FSYNC_APV fsync syscallenter syscall
Xint0x80_syscall
1588 100238 firefox-bin - mi_switch sleepq_switch
sleepq_catch_signals sleepq_wait_sig _sleep __umtx_op_cv_wait _umtx_op
syscallenter syscall Xint0x80_syscall
1588 100239 firefox-bin - mi_switch sleepq_switch
sleepq_catch_signals sleepq_wait_sig _sleep __umtx_op_cv_wait _umtx_op
syscallenter syscall Xint0x80_syscall
1588 100240 firefox-bin - mi_switch sleepq_switch
sleepq_catch_signals sleepq_wait_sig _sleep __umtx_op_cv_wait _umtx_op
syscallenter syscall Xint0x80_syscall