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* [Bug remote/14329] New: GDB will get hang on Windows when using pipe to get stdout and stderr from stub @ 2012-07-04 1:45 terry.guo at arm dot com 2012-07-04 1:48 ` [Bug remote/14329] " terry.guo at arm dot com ` (3 more replies) 0 siblings, 4 replies; 5+ messages in thread From: terry.guo at arm dot com @ 2012-07-04 1:45 UTC (permalink / raw) To: gdb-prs http://sourceware.org/bugzilla/show_bug.cgi?id=14329 Bug #: 14329 Summary: GDB will get hang on Windows when using pipe to get stdout and stderr from stub Product: gdb Version: 7.4 Status: NEW Severity: normal Priority: P2 Component: remote AssignedTo: unassigned@sourceware.org ReportedBy: terry.guo@arm.com Classification: Unclassified This Bugzilla entry is created for mailing list discussion at http://sourceware.org/ml/gdb-patches/2012-06/msg00790.html. This bug is first found at tool chain (2012Q1) released at https://launchpad.net/gcc-arm-embedded/ which is a gdb-7.3 based cross tool chain for arm-none-eabi. Then confirmed that the gdb trunk has same issue. The above MINGW arm-none-eabi GDB will get hang on Windows when use pipe to get stderr and stdout from stub. The command used to start stub in GDB is "target extended-remote | stub-that-write-stderr-before-stdout". For my case, after send "$vFlashDone#ea" to stub, GDB get hang. The GDB source show that GDB will keep waiting for ACK message from stdout of stub, after send the packet. Unfortunately my stub will write some kind of log information into stderr and this action takes place before stub write ACK message to its stdout. So the only pipe is occupied by stderr which is waiting for GDB to consume, while GDB keep waiting for message from the stdout which hasn't pipe to use. We finally end up with a deadlock on pipe between GDB/stderr/stdout. The proposed solution is to let GDB also probe and consume stderr when waiting for stdout. In this way such deadlock can be avoided. The Linux version GDB hasn't such issue. I think it's because we use different way to handle PIPE as stated in functions pipe_open and pipe_windows_open. For Linux we have two socketpair kind pipes, one for stdout and one for stderr. While for windows, we only have one pipe which is created by _pipe function. -- Configure bugmail: http://sourceware.org/bugzilla/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug remote/14329] GDB will get hang on Windows when using pipe to get stdout and stderr from stub 2012-07-04 1:45 [Bug remote/14329] New: GDB will get hang on Windows when using pipe to get stdout and stderr from stub terry.guo at arm dot com @ 2012-07-04 1:48 ` terry.guo at arm dot com 2012-07-04 1:51 ` terry.guo at arm dot com ` (2 subsequent siblings) 3 siblings, 0 replies; 5+ messages in thread From: terry.guo at arm dot com @ 2012-07-04 1:48 UTC (permalink / raw) To: gdb-prs http://sourceware.org/bugzilla/show_bug.cgi?id=14329 Terry Guo <terry.guo at arm dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Target| |arm-none-eabi Status|NEW |ASSIGNED Host| |x86 windows AssignedTo|unassigned at sourceware |terry.guo at arm dot com |dot org | Build| |Mingw -- Configure bugmail: http://sourceware.org/bugzilla/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug remote/14329] GDB will get hang on Windows when using pipe to get stdout and stderr from stub 2012-07-04 1:45 [Bug remote/14329] New: GDB will get hang on Windows when using pipe to get stdout and stderr from stub terry.guo at arm dot com 2012-07-04 1:48 ` [Bug remote/14329] " terry.guo at arm dot com @ 2012-07-04 1:51 ` terry.guo at arm dot com 2012-07-18 4:36 ` cvs-commit at gcc dot gnu.org 2012-07-18 4:58 ` terry.guo at arm dot com 3 siblings, 0 replies; 5+ messages in thread From: terry.guo at arm dot com @ 2012-07-04 1:51 UTC (permalink / raw) To: gdb-prs http://sourceware.org/bugzilla/show_bug.cgi?id=14329 Terry Guo <terry.guo at arm dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |WAITING --- Comment #1 from Terry Guo <terry.guo at arm dot com> 2012-07-04 01:51:45 UTC --- Review comment is at http://sourceware.org/ml/gdb-patches/2012-06/msg00833.html. -- Configure bugmail: http://sourceware.org/bugzilla/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug remote/14329] GDB will get hang on Windows when using pipe to get stdout and stderr from stub 2012-07-04 1:45 [Bug remote/14329] New: GDB will get hang on Windows when using pipe to get stdout and stderr from stub terry.guo at arm dot com 2012-07-04 1:48 ` [Bug remote/14329] " terry.guo at arm dot com 2012-07-04 1:51 ` terry.guo at arm dot com @ 2012-07-18 4:36 ` cvs-commit at gcc dot gnu.org 2012-07-18 4:58 ` terry.guo at arm dot com 3 siblings, 0 replies; 5+ messages in thread From: cvs-commit at gcc dot gnu.org @ 2012-07-18 4:36 UTC (permalink / raw) To: gdb-prs http://sourceware.org/bugzilla/show_bug.cgi?id=14329 --- Comment #2 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> 2012-07-18 04:36:31 UTC --- CVSROOT: /cvs/src Module name: src Changes by: xguo@sourceware.org 2012-07-18 04:36:24 Modified files: gdb : ChangeLog defs.h ser-base.c Log message: 2012-07-18 Terry Guo <terry.guo@arm.com> PR 14329 * defs.h (GDB_MI_MSG_WIDTH): New. * ser_base (ser_base_read_error_fd): New function. (do_ser_base_readchar): Poll error file descriptor as well as standard output. (generic_readchar): Refactor error handling. Patches: http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/ChangeLog.diff?cvsroot=src&r1=1.14472&r2=1.14473 http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/defs.h.diff?cvsroot=src&r1=1.317&r2=1.318 http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/ser-base.c.diff?cvsroot=src&r1=1.24&r2=1.25 -- Configure bugmail: http://sourceware.org/bugzilla/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug remote/14329] GDB will get hang on Windows when using pipe to get stdout and stderr from stub 2012-07-04 1:45 [Bug remote/14329] New: GDB will get hang on Windows when using pipe to get stdout and stderr from stub terry.guo at arm dot com ` (2 preceding siblings ...) 2012-07-18 4:36 ` cvs-commit at gcc dot gnu.org @ 2012-07-18 4:58 ` terry.guo at arm dot com 3 siblings, 0 replies; 5+ messages in thread From: terry.guo at arm dot com @ 2012-07-18 4:58 UTC (permalink / raw) To: gdb-prs http://sourceware.org/bugzilla/show_bug.cgi?id=14329 Terry Guo <terry.guo at arm dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|WAITING |RESOLVED Resolution| |FIXED -- Configure bugmail: http://sourceware.org/bugzilla/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug. ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2012-07-18 4:58 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2012-07-04 1:45 [Bug remote/14329] New: GDB will get hang on Windows when using pipe to get stdout and stderr from stub terry.guo at arm dot com 2012-07-04 1:48 ` [Bug remote/14329] " terry.guo at arm dot com 2012-07-04 1:51 ` terry.guo at arm dot com 2012-07-18 4:36 ` cvs-commit at gcc dot gnu.org 2012-07-18 4:58 ` terry.guo at arm dot com
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