I've been bitten by this bug too and it definitely seems to be related
to workspace switching, although I still haven't found a sure way to
trigger it.
attaching gdb isn't of much help:
(gdb) bt
#0 0xffffe410 in __kernel_vsyscall ()
#1 0xb7bb605e in ?? () from /lib/tls/i686/cmov/libc.so.6
#2 0xb7b458fe in ?? () from /lib/tls/i686/cmov/libc.so.6
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
and strace just keeps looping this bit (with the second argument to
gettimeofday being different for every call):
--- SIGALRM (Alarm clock) @ 0 (0) ---
gettimeofday({1183918875, 56371}, NULL) = 0
gettimeofday({1183918875, 56458}, NULL) = 0
setitimer(ITIMER_REAL, {it_interval={0, 0}, it_value={0, 1000}}, NULL) = 0
sigreturn() = ? (mask now [TERM IO])
futex(0xb7c18120, FUTEX_WAIT, 2, NULL) = -1 EINTR (Interrupted system call)
Hope this helps.
--
emacs21 freezes at random
https://bugs.launchpad.net/bugs/7039
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