Module Name: src
Committed By: riastradh
Date: Sun Mar 13 21:32:27 UTC 2022
Modified Files:
src/sys/net: if_tun.c
Log Message:
tun(4): Reduce lock from IPL_NET to IPL_SOFTNET.
This is never taken from hardware interrupt handlers any more, as far
as I can tell -- only SOFTINT_NET soft interrupt handlers.
This avoids trying to take an adaptive lock, proc_lock, in fownsignal
while holding a spin lock. Unfortunately, it doesn't entirely fix the
problem -- proc_lock is at IPL_NONE, and is held across some not
entirely trivial computations like allocating a new pid table. So it
would really be better if we had some way to deliver SIGIO without
taking proc_lock.
Reported-by: syzbot+3dd54993d3e92e697...@syzkaller.appspotmail.com
Reported-by: syzbot+aca29415f2f0bf23f...@syzkaller.appspotmail.com
To generate a diff of this commit:
cvs rdiff -u -r1.167 -r1.168 src/sys/net/if_tun.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
