Date: Fri, 19 Apr 1996 04:00:51 +1000 From: Bruce Evans <bde@zeta.org.au> To: j@uriah.heep.sax.de, ports@freebsd.org Cc: freebsd-current@freebsd.org Subject: Re: Interesting bash bug - anyone else see this? Message-ID: <199604181800.EAA06384@godzilla.zeta.org.au>
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>> I just noticed it, myself. It doesn't happen in sh or csh, so it's >> definitely one for -bash and -current (if not also -stable; I dunno!). >> >> <go to a directory with many files in it> >> root@reason-> ls -lt | more >> ^Z >> [2]+ Done ls -lt | more >> root@reason-> fg >> ls -lt | more >> Broken pipe >> >> Bug #1: Upon suspending, bash erroneously reports the background job's status >> as "Done", not "Suspended" >> >> Bug #2: Upon resuming, we're hosed - the pipe breaks. This works fine here because my `more' is aliased to `less' like it should be :-). `/bin/ls -lt /usr/src/lib/libc/obj/ | /usr/bin/more' fails in much the under bash, sh and csh. bash gives better error messages but the pipe always breaks. I don't have tcsh installed. >I can reproduce it. Depending upon how quickly i pressed ^Z, i could >even get bash into a totally hosed state, the ^Z has been displayed, >but ``nichts geht mehr''. Only a SIGCONT from a different window >helped. I can't reproduce this. Perhaps it is like the bug that causes bash to hang when starting up (type su and hit ^C; the su often gets stuck in a loop doing a longjmp to nowhere from a signal handler). >... This is your case: > 107 11252 270 1 10 0 628 700 wait S p3 0:00.43 bash > 107 11267 11252 1 28 0 384 232 - T p3 0:00.07 ls -lt >The `ls' has been stopped, but `more' is already dead. (That's why >bash is reporting it as `Done'.) This seems to be a bug in `more'. It goes to a lot of trouble to receive the SIGTSP but seems to always exit if the signal interrupts a read. Try stopping: (sleep 2; cat /etc/passwd) | ktrace /usr/bin/more `kdump' shows `more' receiving the signal and exiting without retrying the read. Bruce
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