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author | attilio <attilio@FreeBSD.org> | 2012-10-30 15:10:50 +0000 |
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committer | attilio <attilio@FreeBSD.org> | 2012-10-30 15:10:50 +0000 |
commit | 279b97daea47b784fa8af7f9e6174384c141cdff (patch) | |
tree | e789d39c82bfc0a96712580c4b803232b496457d /sys/kern/subr_trap.c | |
parent | a93bdbb610d296583acb7082db92d7aa5891d0ff (diff) | |
download | FreeBSD-src-279b97daea47b784fa8af7f9e6174384c141cdff.zip FreeBSD-src-279b97daea47b784fa8af7f9e6174384c141cdff.tar.gz |
Fixup r240246: hwpmc needs to retain the pinning until ASTs are not
executed. This means past the point where userret() is generally
executed.
Skip the td_pinned check if a callchain tracing is currently happening
and add a more robust check to pmc_capture_user_callchain() in order to
catch td_pinned leak past ast() in hwpmc case.
Reported and tested by: fabient
MFC after: 1 week
X-MFC: r240246
Diffstat (limited to 'sys/kern/subr_trap.c')
-rw-r--r-- | sys/kern/subr_trap.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/sys/kern/subr_trap.c b/sys/kern/subr_trap.c index 70df8a1..22cabcb 100644 --- a/sys/kern/subr_trap.c +++ b/sys/kern/subr_trap.c @@ -145,6 +145,11 @@ userret(struct thread *td, struct trapframe *frame) /* * Check for misbehavior. + * + * In case there is a callchain tracing ongoing because of + * hwpmc(4), skip the scheduler pinning check. + * hwpmc(4) subsystem, infact, will collect callchain informations + * at ast() checkpoint, which is past userret(). */ WITNESS_WARN(WARN_PANIC, NULL, "userret: returning"); KASSERT(td->td_critnest == 0, @@ -155,7 +160,7 @@ userret(struct thread *td, struct trapframe *frame) ("userret: Returning with pagefaults disabled")); KASSERT((td->td_pflags & TDP_NOSLEEPING) == 0, ("userret: Returning with sleep disabled")); - KASSERT(td->td_pinned == 0, + KASSERT(td->td_pinned == 0 || (td->td_pflags & TDP_CALLCHAIN) != 0, ("userret: Returning with with pinned thread")); KASSERT(td->td_vp_reserv == 0, ("userret: Returning while holding vnode reservation")); |