I'd suspect it's mishandling the error return from a read(). Or not
handling, but if the error it gets back is for some reason EAGAIN then it's
kinda difficult to handle this sanely except by adding extra
instrumentation to catch the loop.
On Sun, Jun 17, 2018 at 5:28 AM Jon Fairbairn
I’ve just been rebuilding something I wrote ages ago, using stack with lts-11.6 (so that I can use a recent Conduit).
Part (not a part I was modifying) of the code runs as a CGI script, and I was horrified to find that when run by httpd it soaked up CPU like nobody’s business without producing any output. Running it at the command line worked fine, so I traced the problem via audit:
type=AVC msg=audit(1529223103.790:1705516): avc: denied { read } for pid=36764 comm="ghc_ticker" path="[timerfd]" dev=anon_inodefs ino=4597 scontext=system_u:system_r:httpd_sys_script_t:s0 tcontext=system_u:object_r:anon_inodefs_t:s0 tclass=file type=AVC msg=audit(1529223103.790:1705517): avc: denied { read } for pid=36764 comm="ghc_ticker" path="[timerfd]" dev=anon_inodefs ino=4597 scontext=system_u:system_r:httpd_sys_script_t:s0 tcontext=system_u:object_r:anon_inodefs_t:s0 tclass=file
The solution is to add an audit rule to allow that, but surely ghc_ticker shouldn’t be trying again so fast when whatever it is trying to do isn’t permitted?
I don’t know what component ghc_ticker belongs to, so where should I report the problem?
-- Jón Fairbairn Jon.Fairbairn@cl.cam.ac.uk
_______________________________________________ Haskell-Cafe mailing list To (un)subscribe, modify options or view archives go to: http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe Only members subscribed via the mailman list are allowed to post.
-- brandon s allbery kf8nh sine nomine associates allbery.b@gmail.com ballbery@sinenomine.net unix, openafs, kerberos, infrastructure, xmonad http://sinenomine.net