Bug#493823: gpm: segv on SIGWINCH
It should be fixed in gpm-1.99.7-4-gb47, which you can get from http://home.schottelius.org/~nico/temp/gpm-1.99.7-4-gb47.tar.bz2 See bug #493168 for more details. Thanks for your help! Sincerly, Nico -- Think about Free and Open Source Software (FOSS). http://nico.schottelius.org/documentations/foss/the-term-foss/ PGP: BFE4 C736 ABE5 406F 8F42 F7CF B8BE F92A 9885 188C signature.asc Description: Digital signature
Bug#493823: gpm: segv on SIGWINCH
Nico Schottelius [EMAIL PROTECTED] writes: Can you attach gdb and/or strace -fF to it and attach the output? You can also run gpm -D to run it in debug mode and send the last lines before it dies. *** debug [daemon/old_main.c(158)]: selected 1 times *** debug [daemon/getmousedata.c(89)]: Data 0a 00 00 (00) *** debug [daemon/processmouse.c(281)]: dx: 0 dy: 0 x: 2 y: 48 butt: 1 vc: 11 clicks: 0 *** debug [daemon/old_main.c(158)]: selected 1 times *** debug [daemon/getmousedata.c(89)]: Data 08 00 00 (00) *** debug [daemon/processmouse.c(281)]: dx: 0 dy: 0 x: 2 y: 48 butt: 1 vc: 11 clicks: 0 *** warning [daemon/gpm-killed.c(34)]: /usr/sbin/gpm pid 2981 is resizing :-) *** debug [daemon/get_console_size.c(45)]: Screen size: 80 - 50 *** debug [daemon/get_console_size.c(62)]: x 3, y 3 Program received signal SIGSEGV, Segmentation fault. 0x080544a8 in ?? () (gdb) where #0 0x080544a8 in ?? () #1 0x001c in ?? () #2 0x001c in ?? () #3 0x in ?? () And if I recompile noopt,nostrip to get a backtrace the claim is #0 0x0805706c in old_main () at daemon/old_main.c:146 #1 0x080569e7 in main (argc=134572308, argv=0x800) at daemon/main.c:33 which is for (ci = cinfo[i]; ci; ci = ci-next) kill(ci-data.pid,SIGWINCH); with i=64 and with cinfo[64]=0x50 ... which looks like a rather dodgy pointer value. Sticking a watchpoint on cinfo[64] shows it gets clobbered when get_console_size() stores to maxx. And indeed gdb claims the addresses of cinfo[64] and maxx are the same. (So it seems that 0x50 is 80, the screen width.) Putting gpm.c through the preprocessor it looks like it gets compiled with MAX_VC=63 coming from MAX_NR_CONSOLES in linux/vt.h. But the same on old_main.c ends up with MAX_VC=64 coming from the fallback MAX_NR_CONSOLES=64 in daemon.h. I guess old_main.c is going past the end of the array when it tries to propagate sigwinch to the clients ... -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Bug#493823: gpm: segv on SIGWINCH
Package: gpm Version: 1.20.4-2 Severity: normal If the running gpm server process is sent a sigwinch kill -WINCH $pid it dies with a segv, Aug 4 13:50:56 blah /usr/sbin/gpm[6589]: /usr/sbin/gpm pid 6589 is resizing :-) Aug 4 13:50:56 blah kernel: [10393.257728] gpm[6589]: segfault at 58 ip 080544a8 sp bfde19e0 error 4 in gpm[8048000+14000] I don't know what it's supposed to do for sigwinch, presumably segv is not it :-). I noticed it trying /etc/init.d/console-screen.kbd.sh from the kbd package, it sends a sigwinch to gpm when the font, or key mapping, or something, might have changed. -- System Information: Debian Release: lenny/sid APT prefers unstable APT policy: (500, 'unstable') Architecture: i386 (i586) Kernel: Linux 2.6.25-2-486 Locale: LANG=en_AU, LC_CTYPE=en_AU (charmap=ISO-8859-1) Shell: /bin/sh linked to /bin/dash Versions of packages gpm depends on: ii debconf [debconf-2.0] 1.5.23 Debian configuration management sy ii debianutils 2.30 Miscellaneous utilities specific t ii libc6 2.7-12 GNU C Library: Shared libraries ii libgpm2 1.20.4-2 General Purpose Mouse - shared lib ii lsb-base 3.2-16 Linux Standard Base 3.2 init scrip ii ucf 3.007 Update Configuration File: preserv gpm recommends no packages. gpm suggests no packages. -- debconf information: * gpm/responsiveness: 30 * gpm/repeat_type: * gpm/append: -l a-zA-Z0-9_.:~/��-� * gpm/restart: true * gpm/sample_rate: * gpm/device: /dev/psaux * gpm/restart_default: true * gpm/type: ps2 -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Bug#493823: gpm: segv on SIGWINCH
Hello Kevin, Kevin Ryde [Tue, Aug 05, 2008 at 11:51:05AM +1000]: I don't know what it's supposed to do for sigwinch, presumably segv is not it :-). gpm is notified of a console change with WINCH. Can you attach gdb and/or strace -fF to it and attach the output? You can also run gpm -D to run it in debug mode and send the last lines before it dies. I am currently digging in the sourcecode for the reason. Sincerly, Nico -- Think about Free and Open Source Software (FOSS). http://nico.schottelius.org/documentations/foss/the-term-foss/ PGP: BFE4 C736 ABE5 406F 8F42 F7CF B8BE F92A 9885 188C signature.asc Description: Digital signature
