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| author | jhb <jhb@FreeBSD.org> | 2003-08-07 13:58:13 +0000 |
|---|---|---|
| committer | jhb <jhb@FreeBSD.org> | 2003-08-07 13:58:13 +0000 |
| commit | 12f44bde5dc9d7f8825e07548b2811c1de0d4c0c (patch) | |
| tree | 743ec5fbe8fb3ee0ca0b266301e4285e56d9c712 /sys | |
| parent | c47985e350989a08effa9ee72e9aa7c100d8d407 (diff) | |
| download | FreeBSD-src-12f44bde5dc9d7f8825e07548b2811c1de0d4c0c.zip FreeBSD-src-12f44bde5dc9d7f8825e07548b2811c1de0d4c0c.tar.gz | |
The ktrace mutex does not need to be locked around the post of the ktrace
semaphore and doing so can lead to a possible reversal. WITNESS would have
caught this if semaphores were used more often in the kernel.
Submitted by: Ted Unangst <tedu@stanford.edu>, Dawson Engler
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/kern/kern_ktrace.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/sys/kern/kern_ktrace.c b/sys/kern/kern_ktrace.c index a6630f2..ded99e9 100644 --- a/sys/kern/kern_ktrace.c +++ b/sys/kern/kern_ktrace.c @@ -261,8 +261,8 @@ ktr_submitrequest(struct ktr_request *req) mtx_lock(&ktrace_mtx); STAILQ_INSERT_TAIL(&ktr_todo, req, ktr_list); - sema_post(&ktrace_sema); mtx_unlock(&ktrace_mtx); + sema_post(&ktrace_sema); curthread->td_pflags &= ~TDP_INKTRACE; } |
