mirror of
https://github.com/freebsd/freebsd-src
synced 2024-10-15 04:43:53 +00:00
b9cedb46e2
The SCHEDULER_STOPPED() hack breaks locking generally, and mtx_trylock_*() especially. When mtx_trylock_*() returns nonzero, naive code version here trusts it to have worked. But when SCHEDULER_STOPPED() is true, mtx_trylock_*() returns 1 without doing anything. Then mtx_unlock_*() crashes especially badly attempting to unlock iff the error is detected, since mutex unlocking functions don't check SCHEDULER_STOPPED(). syscons already didn't trust mtx_trylock_spin(), but it was missing the logic to turn on sp->kdb_locked when turning off sp->mtx_locked during panics. It also used panicstr instead of SCHEDULER_LOCKED because I thought that panicstr was more fragile. They only differ for a window of lines in panic(), and in broken cases where stop_cpus_hard() in panic() didn't work. |
||
---|---|---|
.. | ||
apm | ||
blank | ||
daemon | ||
dragon | ||
fade | ||
fire | ||
fonts | ||
green | ||
logo | ||
plasma | ||
rain | ||
snake | ||
star | ||
warp | ||
scgfbrndr.c | ||
schistory.c | ||
scmouse.c | ||
scterm-teken.c | ||
scterm.c | ||
scvesactl.c | ||
scvgarndr.c | ||
scvidctl.c | ||
scvtb.c | ||
syscons.c | ||
syscons.h | ||
sysmouse.c |