gnutls problems again

gnutls problems again

[Lars Magne Ingebrigtsen]

The Gmail IMAP servers seem to be having problems again, but it triggers
an interesting gnutls-related bug.

If I say:

(gnus-open-server '(nnimap "imap.gmail.com"))

then Emacs starts using 100% CPU.  Emacs doesn't hang, but as long as
that connection is up (i.e., until I kill the process buffer), then
strace says the following:

poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}], 2, 0) = 0 (Timeout)
select(10, [3 4 6 7 8], [], NULL, {0, 0}) = 1 (in [8], left {0, 0})
getrusage(RUSAGE_SELF, {ru_utime={44, 494780}, ru_stime={8, 100506}, ...}) = 0
times({tms_utime=4449, tms_stime=810, tms_cutime=0, tms_cstime=0}) = 1731291756
getrusage(RUSAGE_SELF, {ru_utime={44, 494780}, ru_stime={8, 100506}, ...}) = 0
times({tms_utime=4449, tms_stime=810, tms_cutime=0, tms_cstime=0}) = 1731291756
read(3, 0x11fe4f4, 4096)                = -1 EAGAIN (Resource temporarily unavailable)
poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}], 2, 0) = 0 (Timeout)
select(10, [3 4 6 7 8], [], NULL, {0, 0}) = 1 (in [8], left {0, 0})
getrusage(RUSAGE_SELF, {ru_utime={44, 494780}, ru_stime={8, 100506}, ...}) = 0
times({tms_utime=4449, tms_stime=810, tms_cutime=0, tms_cstime=0}) = 1731291756

And a *lot* of that.

-- 
(domestic pets only, the antidote for overdose, milk.)
  larsi@gnus.org * Lars Magne Ingebrigtsen

Re: gnutls problems again

[Ted Zlatanov]

On Tue, 15 Mar 2011 22:19:09 +0100 Lars Magne Ingebrigtsen <larsi@gnus.org> wrote: 

LMI> The Gmail IMAP servers seem to be having problems again, but it triggers
LMI> an interesting gnutls-related bug.

LMI> If I say:

LMI> (gnus-open-server '(nnimap "imap.gmail.com"))

LMI> then Emacs starts using 100% CPU.  Emacs doesn't hang, but as long as
LMI> that connection is up (i.e., until I kill the process buffer), then
LMI> strace says the following:

LMI> poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}], 2, 0) = 0 (Timeout)
LMI> select(10, [3 4 6 7 8], [], NULL, {0, 0}) = 1 (in [8], left {0, 0})
LMI> getrusage(RUSAGE_SELF, {ru_utime={44, 494780}, ru_stime={8, 100506}, ...}) = 0
LMI> times({tms_utime=4449, tms_stime=810, tms_cutime=0, tms_cstime=0}) = 1731291756
LMI> getrusage(RUSAGE_SELF, {ru_utime={44, 494780}, ru_stime={8, 100506}, ...}) = 0
LMI> times({tms_utime=4449, tms_stime=810, tms_cutime=0, tms_cstime=0}) = 1731291756
LMI> read(3, 0x11fe4f4, 4096)                = -1 EAGAIN (Resource temporarily unavailable)
LMI> poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}], 2, 0) = 0 (Timeout)
LMI> select(10, [3 4 6 7 8], [], NULL, {0, 0}) = 1 (in [8], left {0, 0})
LMI> getrusage(RUSAGE_SELF, {ru_utime={44, 494780}, ru_stime={8, 100506}, ...}) = 0
LMI> times({tms_utime=4449, tms_stime=810, tms_cutime=0, tms_cstime=0}) = 1731291756

LMI> And a *lot* of that.

Claudio Bley's patch (posted on emacs-devel recently) does some EAGAIN
reworking which may fix this.  His code is for W32 but it has general
fixes too.  He's supposed to look at it again this weekend and maybe
bring in my crappy half-baked patch for callback support, which lets you
set the verify flags.  So maybe you want to work with him on debugging
this hang.

Ted

Re: gnutls problems again

[Lars Magne Ingebrigtsen]

Ted Zlatanov <tzz@lifelogs.com> writes:

> Claudio Bley's patch (posted on emacs-devel recently) does some EAGAIN
> reworking which may fix this.  His code is for W32 but it has general
> fixes too. 

Ok; I'll wait until his patch is in Emacs before trying to debug
further.

-- 
(domestic pets only, the antidote for overdose, milk.)
  larsi@gnus.org * Lars Magne Ingebrigtsen